STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 0.1 2.0 2.6 9.2 17.5 20.6 21.3 20.6 16.4 6.5 5.4 0.5 10.2 MINIMUN AIR TEMPERATURE (C) -5.9 -4.0 -3.0 -0.9 4.9 10.6 10.5 10.0 6.0 0.5 -3.3 -3.8 1.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 20 11 12 10 0 0 0 0 0 1 14 11 79 DAYS WITH FREEZING MIN.<= 0 29 24 23 19 1 0 0 0 2 14 25 22 159 TEMPERATURE RECORDS LOWEST(C) -13.5 -13.4 -10.4 -9.8 -0.4 2.2 5.0 3.4 -1.0 -4.0 -15.0 -19.4 -19.4 DAY 14 11 22 1 7 4 4 30 30 13 30 31 MAXIMUM AIR TEMPERATURE (C) 4.3 6.2 6.3 14.2 22.4 25.0 25.9 25.8 22.6 10.8 10.6 3.7 14.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 2 4 6 0 0 0 0 12 DAYS WITH MAXIMUM TEMP. <= 0 0 2 0 0 0 0 0 0 0 0 1 4 7 TEMPERATURE RECORDS HIGHEST(C) 11.0 13.5 13.0 21.0 26.5 31.2 33.5 32.0 27.2 25.0 15.6 10.0 33.5 DAY 31 3 9 30 9 29 18 3 5 2 6 12 DIF. BETWEEN (MAX.-MIN.) (C) 10.2 10.2 9.3 15.1 17.5 14.4 15.4 15.8 16.6 10.3 13.9 7.5 13.0 MEAN DAILY TEMP. (MDT) (C) -0.8 1.1 1.6 6.7 13.6 17.8 18.2 17.9 14.3 5.7 3.6 -0.1 8.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.0 3.1 4.3 0.0 0.0 0.0 0.0 8.5 HEATING DEG. DAYS(BASE 18 0C) 582.7 472.1 507.4 312.2 136.1 31.1 22.6 36.4 116.9 381.9 431.3 543.6 3574.3 DEWPOINT (MEAN C) -5.1 -2.4 -2.3 0.7 3.1 4.7 8.5 8.2 5.2 1.8 -1.5 -2.7 1.5 MIXING RATIO (G/KG) 3.30 4.04 4.13 5.12 6.06 6.82 8.79 8.53 7.03 5.46 4.41 4.06 5.65 VAPOUR PRESSURE (HPA) 4.34 5.28 5.37 6.69 7.92 8.89 11.42 11.10 9.19 7.18 5.80 5.31 7.37 SATURATION DEF. (HPA) 2.09 2.10 2.29 5.79 12.84 16.17 14.95 14.68 10.62 3.23 3.84 1.38 7.50 RELATIVE HUMIDITY (MEAN %) 71 75 73 59 43 39 48 50 53 76 66 82 61 RELATIVE HUMIDITY (MAX. %) 87 92 90 85 70 60 68 79 85 94 88 94 83 RELATIVE HUMIDITY (MIN. %) 54 60 56 43 28 26 35 34 35 62 47 70 46 RELATIVE HUMIDITY (MEAN% 03UTC) 83 87 87 83 69 52 66 77 84 90 87 89 80 RELATIVE HUMIDITY (MEAN% 09UTC) 65 67 67 52 35 32 41 38 38 68 53 74 53 RELATIVE HUMIDITY (MEAN% 15UTC) 70 76 72 53 38 40 47 46 55 80 66 83 61 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 7.5 32.8 56.4 54.1 12.7 9.0 15.4 37.4 0.0 105.5 21.9 92.3 445.0 DAYS WITH PRECIPITATION >=10 0 0 0 3 0 0 0 1 0 5 1 3 13 DAYS WITH PRECIPITATION >= 5 0 1 6 4 1 0 2 1 0 8 2 6 31 DAYS WITH PRECIPITATION >= 1 4 11 14 9 2 3 3 2 0 13 3 13 77 DAYS WITH PRECIPITATION 6 13 17 9 6 4 3 3 1 14 4 16 96 GREATEST DAILY PRECIPITATION 4.0 6.0 9.2 14.0 9.0 4.0 7.0 36.0 0.0 20.0 10.0 28.0 36.0 DAY 27 5 14 15 12 18 3 6 ** 8 7 23 DAY WITH THUNDER STORM 0 0 1 2 2 1 2 0 0 0 0 0 8 DAYS WITH SNOW OR SLEET 3 5 10 1 0 0 0 0 0 2 0 9 30 DAYS WITH DUST 0 1 1 0 0 0 0 0 0 0 0 0 2 WIND DIRECTION (PREVAILING) 270 270 270 270 270 135 135 135 135 135 270 270 135 PREVAILING WIND SPEED(KNOTS) 7.0 9.1 8.2 11.4 6.8 6.2 5.7 6.5 5.5 6.8 5.7 4.8 6.1 PREVAILING WIND PERCENT 20.0 18.6 25.2 32.7 23.2 38.7 35.5 31.6 27.3 27.7 18.0 21.3 16.3 CALMS PERCENT OF WIND 60.0 50.7 39.4 28.0 40.6 26.0 26.5 31.0 38.0 47.1 48.7 46.5 40.2 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 277 270 259 271 269 125 119 128 129 125 238 268 217 VECTOR WIND MAGNITUDE(KNOTS) 2.1 2.8 2.7 5.5 2.2 3.5 3.3 2.9 1.7 2.2 0.9 1.5 0.9 WIND STEADINESES (MEAN %) 80.8 66.7 55.1 70.5 61.1 70.0 82.5 70.7 54.8 66.7 30.0 65.2 22.5 WIND SPEED (MEAN KNOTS) 2.6 4.2 4.9 7.8 3.6 5.0 4.0 4.1 3.1 3.3 3.0 2.3 4.0 FASTEST WIND DIRECTION 250 270 270 150 260 150 120 160 150 270 260 250 270 FASTEST WIND SPEED (KNOTS) 31 43 39 39 21 23 16 16 14 23 17 14 43 DAY 10 25 6 4 24 11 14 13 7 24 7 12 DAYS WITH SKY CLEAR (0-2)/8 5 4 2 12 7 18 23 20 23 10 12 3 139 DAYS WITH P.CLOUDY (3-6)/8 20 11 12 9 14 11 7 9 6 6 15 8 128 DAYS WITH CLOUDY (7-8)/8 6 13 17 9 10 1 1 2 1 15 3 20 98 DAYS WITH VISIBILITY =< 2 KM 0 1 3 1 0 0 0 0 0 2 0 1 8 DURATION OF SUNSHINE HOURS 166.7 128.2 162.5 231.6 255.7 304.2 351.6 321.6 288.2 142.2 190.2 85.7 2628.4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 821.3 819.9 815.6 819.7 821.5 820.8 820.6 820.5 822.8 825.4 824.2 820.2 821.0 MAX. QFE PRESSURE IN HPA 830.0 828.5 825.0 827.5 826.8 825.2 824.5 828.8 827.0 831.1 833.0 832.0 833.0 DAY-HOUR 17- 6 1- 6 23- 6 30- 6 13- 6 28- 6 10-15 8- 6 25- 6 16- 6 30- 6 1- 3 MIN. QFE PRESSURE IN HPA 811.1 808.0 805.0 810.5 816.0 816.5 815.2 815.0 818.6 820.7 814.0 811.0 805.0 DAY-HOUR 6-12 10-15 14- 3 19- 9 23-15 9-12 3- 3 24-15 22-12 3-12 7- 3 30-12 MEAN QNH PRESSURE IN HPA 1020.1 1018.5 1013.4 1018.3 1020.4 1019.5 1019.3 1019.2 1021.9 1025.0 1023.6 1018.8 1019.8 MAX. QNH PRESSURE IN HPA 1030.5 1028.7 1024.5 1027.5 1026.7 1024.8 1024.0 1029.1 1026.9 1031.8 1034.1 1032.9 1034.1 DAY-HOUR 17- 6 1- 6 23- 6 30- 6 13- 6 28- 6 10-15 8- 6 25- 6 16- 6 30- 6 1- 3 MIN. QNH PRESSURE IN HPA 1008.0 1004.3 1000.7 1007.3 1013.8 1014.4 1012.9 1012.6 1016.9 1019.4 1011.4 1007.9 1000.7 DAY-HOUR 6-12 10-15 14- 3 19- 9 23-15 9-12 3- 3 24-15 22-12 3-12 7- 3 30-12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 821.0 820.0 815.4 819.8 821.5 820.7 820.6 820.6 823.0 825.2 823.9 820.3 821.0 MAX. QFE PRESSURE IN HPA 829.8 828.1 824.0 827.1 826.0 824.4 823.5 827.4 826.0 830.2 832.5 832.0 832.5 DAY 21 1 23 30 13 28 25 8 25 16 30 1 MIN. QFE PRESSURE IN HPA 813.7 812.8 805.0 811.5 816.4 817.5 815.2 816.7 819.4 822.0 814.0 811.8 805.0 DAY 24 10 14 19 23 9 3 15 6 22 7 24 MEAN QNH PRESSURE IN HPA 1019.8 1018.6 1013.0 1018.3 1020.4 1019.4 1019.3 1019.4 1022.1 1024.7 1023.2 1018.9 1019.8 MAX. QNH PRESSURE IN HPA 1030.3 1028.2 1023.4 1027.1 1025.7 1023.8 1022.8 1027.4 1025.7 1030.7 1033.5 1032.9 1033.5 DAY 21 1 23 30 13 28 25 8 25 16 30 1 MIN. QNH PRESSURE IN HPA 1011.1 1010.0 1000.7 1008.5 1014.3 1015.6 1012.9 1014.7 1017.9 1021.0 1011.4 1008.8 1000.7 DAY 24 10 14 19 23 9 3 15 6 22 7 24 MEAN QFF PRESSURE IN HPA 1024.4 1021.2 1014.8 1016.0 1011.8 1008.5 1007.7 1008.5 1015.4 1024.0 1024.5 1022.2 1016.6 MAX. QFF PRESSURE IN HPA 1038.8 1033.0 1030.7 1027.3 1019.3 1014.2 1012.6 1016.5 1024.4 1032.2 1045.4 1043.2 1045.4 DAY 12 12 23 22 13 6 11 6 24 17 30 1 MIN. QFF PRESSURE IN HPA 1010.8 1010.0 1003.9 1003.2 1002.9 1004.5 1000.5 1001.5 1005.7 1012.5 1004.5 1008.8 1000.5 DAY 24 9 14 19 23 2 8 25 6 3 7 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 822.3 821.1 816.4 820.4 822.1 821.2 821.0 821.1 823.6 825.8 824.7 821.0 821.7 MAX. QFE PRESSURE IN HPA 830.0 828.5 825.0 827.5 826.8 825.2 824.1 828.8 827.0 831.1 833.0 832.0 833.0 DAY 17 1 23 30 13 28 10 8 25 16 30 1 MIN. QFE PRESSURE IN HPA 815.0 812.9 806.8 811.2 817.1 817.5 816.4 817.0 820.1 822.5 814.9 812.0 806.8 DAY 6 10 14 19 22 9 3 18 6 22 7 30 MEAN QNH PRESSURE IN HPA 1021.3 1019.9 1014.2 1019.1 1021.2 1020.1 1019.7 1019.9 1022.9 1025.5 1024.2 1019.8 1020.6 MAX. QNH PRESSURE IN HPA 1030.5 1028.7 1024.5 1027.5 1026.7 1024.8 1023.5 1029.1 1026.9 1031.8 1034.1 1032.9 1034.1 DAY 17 1 23 30 13 28 10 8 25 16 30 1 MIN. QNH PRESSURE IN HPA 1012.6 1010.1 1002.8 1008.1 1015.1 1015.6 1014.3 1015.0 1018.7 1021.6 1012.5 1009.0 1002.8 DAY 6 10 14 19 22 9 3 18 6 22 7 30 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 821.8 820.4 816.0 820.0 821.8 821.1 820.8 820.7 822.9 825.5 824.2 820.0 821.3 MAX. QFE PRESSURE IN HPA 829.8 826.8 824.7 826.5 826.1 824.6 824.4 828.5 827.0 830.9 832.2 831.0 832.2 DAY 21 1 23 30 13 28 10 8 25 16 30 1 MIN. QFE PRESSURE IN HPA 812.5 811.5 806.0 810.5 816.4 817.6 816.4 816.8 819.6 821.5 814.7 812.6 806.0 DAY 6 10 19 19 23 9 6 18 22 23 7 23 MEAN QNH PRESSURE IN HPA 1020.7 1019.0 1013.8 1018.6 1020.7 1019.9 1019.5 1019.4 1022.1 1025.1 1023.6 1018.6 1020.1 MAX. QNH PRESSURE IN HPA 1030.3 1026.7 1024.2 1026.3 1025.9 1024.1 1023.8 1028.7 1026.9 1031.6 1033.1 1031.7 1033.1 DAY 21 1 23 30 13 28 10 8 25 16 30 1 MIN. QNH PRESSURE IN HPA 1009.6 1008.5 1001.9 1007.3 1014.3 1015.7 1014.3 1014.8 1018.1 1020.4 1012.3 1009.8 1001.9 DAY 6 10 19 19 23 9 6 18 22 23 7 23 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 820.6 819.1 815.1 819.2 821.1 820.4 820.3 820.0 822.1 825.1 823.9 819.7 820.6 MAX. QFE PRESSURE IN HPA 827.5 826.2 823.1 826.5 825.0 823.4 824.4 828.5 826.8 830.6 832.8 830.0 832.8 DAY 12 1 23 30 13 28 10 8 25 16 30 1 MIN. QFE PRESSURE IN HPA 811.1 810.0 805.0 810.5 816.4 816.5 815.6 815.2 818.6 820.7 814.7 811.0 805.0 DAY 6 10 19 19 23 9 7 24 22 3 7 30 MEAN QNH PRESSURE IN HPA 1019.3 1017.5 1012.8 1017.6 1019.9 1019.1 1018.9 1018.6 1021.1 1024.7 1023.2 1018.3 1019.2 MAX. QNH PRESSURE IN HPA 1027.5 1026.0 1022.3 1026.3 1024.5 1022.6 1023.8 1028.7 1026.7 1031.2 1033.8 1030.5 1033.8 DAY 12 1 23 30 13 28 10 8 25 16 30 1 MIN. QNH PRESSURE IN HPA 1008.0 1006.7 1000.7 1007.3 1014.3 1014.4 1013.3 1012.9 1016.9 1019.4 1012.3 1007.9 1000.7 DAY 6 10 19 19 23 9 7 24 22 3 7 30 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 820.7 819.1 815.3 819.3 821.1 820.4 820.3 820.2 822.4 825.3 824.2 820.2 820.7 MAX. QFE PRESSURE IN HPA 828.5 826.2 823.1 825.5 825.3 823.0 824.5 828.5 826.8 830.6 832.8 830.5 832.8 DAY 20 1 23 30 13 6 10 8 25 16 30 1 MIN. QFE PRESSURE IN HPA 811.1 808.0 806.5 811.5 816.0 816.5 816.0 815.0 818.8 820.7 814.7 813.0 806.5 DAY 6 10 13 4 23 9 7 24 22 3 7 23 MEAN QNH PRESSURE IN HPA 1019.4 1017.6 1013.0 1017.8 1019.8 1019.1 1019.0 1018.8 1021.4 1024.9 1023.6 1018.8 1019.4 MAX. QNH PRESSURE IN HPA 1028.7 1026.0 1022.3 1025.1 1024.9 1022.2 1024.0 1028.7 1026.7 1031.2 1033.8 1031.1 1033.8 DAY 20 1 23 30 13 6 10 8 25 16 30 1 MIN. QNH PRESSURE IN HPA 1008.0 1004.3 1002.5 1008.5 1013.8 1014.4 1013.8 1012.6 1017.2 1019.4 1012.3 1010.2 1002.5 DAY 6 10 13 4 23 9 7 24 22 3 7 23 MEAN QFF PRESSURE IN HPA 1023.8 1020.1 1014.8 1015.2 1011.2 1008.2 1007.2 1008.1 1014.4 1024.2 1024.9 1022.2 1016.2 MAX. QFF PRESSURE IN HPA 1035.4 1030.5 1028.4 1024.7 1018.2 1014.1 1014.8 1017.7 1022.4 1031.5 1045.0 1040.8 1045.0 DAY 12 11 22 1 13 6 10 8 23 26 30 1 MIN. QFF PRESSURE IN HPA 1011.9 1007.1 1004.4 1000.6 1002.2 1002.9 1000.0 999.9 1005.7 1014.4 1005.1 1010.3 999.9 DAY 6 10 19 25 23 9 7 13 1 3 6 23 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -4.3 -5.2 2.7 9.1 14.3 19.1 19.8 18.7 16.6 11.7 5.0 0.2 9.0 MINIMUN AIR TEMPERATURE (C) -9.6 -11.7 -2.3 2.0 4.3 8.6 12.7 11.8 6.6 2.0 -2.6 -6.0 1.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 20 28 10 5 0 0 0 0 0 0 11 16 90 DAYS WITH FREEZING MIN.<= 0 31 28 22 12 1 0 0 0 0 5 22 25 146 TEMPERATURE RECORDS LOWEST(C) -25.0 -27.0 -12.0 -7.0 -0.6 3.0 4.8 3.0 1.2 -3.0 -9.6 -21.5 -27.0 DAY 3 7 6 6 7 3 29 26 27 2 15 29 MAXIMUM AIR TEMPERATURE (C) -0.3 -0.8 6.8 13.4 19.1 23.4 23.6 22.9 22.2 17.4 10.0 4.3 13.5 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 1 4 2 0 0 0 0 7 DAYS WITH MAXIMUM TEMP. <= 0 14 19 1 0 0 0 0 0 0 0 0 9 43 TEMPERATURE RECORDS HIGHEST(C) 4.5 7.4 13.6 18.2 25.6 31.0 33.2 30.0 28.6 23.5 17.0 13.6 33.2 DAY 6 23 19 14 27 13 31 11 9 4 3 9 DIF. BETWEEN (MAX.-MIN.) (C) 9.3 10.9 9.1 11.4 14.8 14.8 10.9 11.1 15.6 15.4 12.6 10.3 12.2 MEAN DAILY TEMP. (MDT) (C) -5.0 -6.2 2.2 7.7 11.7 16.0 18.1 17.3 14.4 9.7 3.7 -0.9 7.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 2.6 4.7 0.0 0.0 0.0 0.0 0.0 7.4 HEATING DEG. DAYS(BASE 18 0C) 681.1 703.1 472.8 308.7 188.7 71.6 24.9 36.2 107.4 256.8 410.9 563.6 3825.9 DEWPOINT (MEAN C) -6.4 -7.7 -1.6 3.4 4.3 7.4 11.5 11.1 6.9 3.7 -1.7 -4.4 2.2 MIXING RATIO (G/KG) 3.07 2.82 4.29 6.33 6.51 8.15 10.61 10.30 7.79 6.22 4.38 3.57 6.17 VAPOUR PRESSURE (HPA) 4.02 3.69 5.58 8.25 8.50 10.59 13.74 13.35 10.16 8.16 5.74 4.67 8.04 SATURATION DEF. (HPA) 0.71 0.85 2.18 4.02 8.75 12.52 10.30 8.98 10.00 6.65 3.66 2.09 5.89 RELATIVE HUMIDITY (MEAN %) 86 84 75 71 56 51 62 64 59 64 65 74 68 RELATIVE HUMIDITY (MAX. %) 95 94 93 96 87 81 81 85 90 96 86 91 90 RELATIVE HUMIDITY (MIN. %) 76 72 61 53 39 36 50 51 41 43 47 58 52 RELATIVE HUMIDITY (MEAN% 03UTC) 91 92 92 94 86 80 79 83 90 94 81 86 87 RELATIVE HUMIDITY (MEAN% 09UTC) 80 78 66 62 46 42 53 54 45 48 54 63 58 RELATIVE HUMIDITY (MEAN% 15UTC) 88 84 73 69 52 49 62 69 59 66 65 75 68 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 65.0 114.2 98.0 92.0 26.4 42.2 14.0 19.0 2.0 44.6 92.7 53.6 663.7 DAYS WITH PRECIPITATION >=10 2 4 4 4 1 1 0 0 0 1 3 3 23 DAYS WITH PRECIPITATION >= 5 2 8 9 8 3 3 1 3 0 5 4 4 50 DAYS WITH PRECIPITATION >= 1 13 12 15 16 5 8 4 3 2 9 10 6 103 DAYS WITH PRECIPITATION 15 13 15 16 6 12 4 5 2 10 12 8 118 GREATEST DAILY PRECIPITATION 24.0 31.0 15.0 15.0 11.0 11.0 9.0 7.0 1.0 10.0 36.0 18.0 36.0 DAY 19 2 21 8 1 11 2 5 18 17 11 17 DAY WITH THUNDER STORM 0 0 3 2 1 1 0 0 0 2 0 0 9 DAYS WITH SNOW OR SLEET 15 10 6 1 0 0 0 0 0 0 3 8 43 DAYS WITH DUST 0 0 1 0 0 1 0 0 0 0 0 1 3 WIND DIRECTION (PREVAILING) 90 270 270 *** *** 135 90 90 90 270 270 270 *** PREVAILING WIND SPEED(KNOTS) 9.7 10.4 7.2 **** **** 5.6 7.2 5.5 6.9 5.5 6.7 5.6 **** PREVAILING WIND PERCENT 8.4 6.9 17.6 ***** ***** 16.0 47.1 52.3 33.3 17.4 24.0 20.6 ***** CALMS PERCENT OF WIND 72.7 74.5 62.0 ***** ***** 34.7 33.5 23.2 48.0 54.8 54.0 66.5 ***** NO. OF WIND OBSERVATION 154 145 142 49 63 150 155 155 150 155 150 155 1623 VECTOR WIND DIRECTION (MEAN) 179 208 272 *** *** 152 96 103 91 216 250 271 *** VECTOR WIND MAGNITUDE(KNOTS) 0.3 0.8 1.7 **** **** 1.1 4.2 3.6 2.0 0.7 1.9 1.4 **** WIND STEADINESES (MEAN %) 12.5 42.1 73.9 ***** ***** 32.4 91.3 85.7 64.5 28.0 65.5 70.0 ***** WIND SPEED (MEAN KNOTS) 2.4 1.9 2.3 **** **** 3.4 4.6 4.2 3.1 2.5 2.9 2.0 **** FASTEST WIND DIRECTION 100 260 230 *** *** 160 100 120 60 270 260 190 *** FASTEST WIND SPEED (KNOTS) 27 17 16 *** *** 16 17 16 14 14 16 16 *** DAY 16 29 3 ** ** 28 15 13 17 30 9 26 DAYS WITH SKY CLEAR (0-2)/8 5 6 6 3 9 16 20 11 17 13 11 9 126 DAYS WITH P.CLOUDY (3-6)/8 8 8 11 12 17 13 10 18 12 13 13 15 150 DAYS WITH CLOUDY (7-8)/8 18 15 14 15 5 1 1 2 1 5 6 7 90 DAYS WITH VISIBILITY =< 2 KM 1 1 0 0 3 0 0 0 1 1 0 1 8 DURATION OF SUNSHINE HOURS 90.8 110.4 187.3 196.7 292.3 314.6 347.1 296.8 307.2 219.8 170.4 141.1 2674.5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 818.9 818.6 815.9 820.4 820.4 819.0 819.3 819.9 822.4 824.1 821.5 819.0 819.9 MAX. QFE PRESSURE IN HPA 828.3 828.0 824.9 829.1 826.0 824.1 823.5 826.2 828.7 830.0 830.0 825.9 830.0 DAY-HOUR 10- 9 6- 9 17- 3 8-12 4-15 12- 9 31- 3 21- 6 21- 9 28- 6 6- 3 21-12 MIN. QFE PRESSURE IN HPA 811.7 808.0 803.6 813.0 812.0 812.4 816.0 813.0 817.9 816.6 813.0 802.0 802.0 DAY-HOUR 29- 3 1-12 4-15 30-15 1-12 24-15 1- 3 29-15 4- 3 30-12 20- 3 27- 3 MEAN QNH PRESSURE IN HPA 1017.2 1016.9 1013.7 1019.1 1019.1 1017.4 1017.7 1018.5 1021.5 1023.4 1020.4 1017.4 1018.5 MAX. QNH PRESSURE IN HPA 1028.5 1028.1 1024.4 1029.4 1025.7 1023.5 1022.8 1026.0 1029.0 1030.5 1030.5 1025.6 1030.5 DAY-HOUR 10- 9 6- 9 17- 3 8-12 4-15 12- 9 31- 3 21- 6 21- 9 28- 6 6- 3 21-12 MIN. QNH PRESSURE IN HPA 1008.7 1004.3 999.0 1010.2 1009.0 1009.5 1013.8 1010.2 1016.1 1014.5 1010.2 997.1 997.1 DAY-HOUR 29- 3 1-12 4-15 30-15 1-12 24-15 1- 3 29-15 4- 3 30-12 20- 3 27- 3 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 818.5 818.1 815.5 820.0 820.5 819.1 819.1 820.1 822.3 824.0 821.4 818.6 819.8 MAX. QFE PRESSURE IN HPA 827.4 826.0 824.9 827.0 825.8 824.0 823.5 825.9 827.0 829.0 830.0 824.9 830.0 DAY 10 6 17 9 17 13 31 21 21 28 6 5 MIN. QFE PRESSURE IN HPA 811.7 808.0 806.0 813.5 812.8 814.0 816.0 815.0 817.9 818.3 813.0 802.0 802.0 DAY 29 2 3 30 1 24 1 29 4 20 20 27 MEAN QNH PRESSURE IN HPA 1016.8 1016.3 1013.2 1018.6 1019.1 1017.5 1017.5 1018.7 1021.4 1023.3 1020.2 1016.9 1018.3 MAX. QNH PRESSURE IN HPA 1027.4 1025.7 1024.4 1026.9 1025.5 1023.4 1022.8 1025.6 1026.9 1029.3 1030.5 1024.4 1030.5 DAY 10 6 17 9 17 13 31 21 21 28 6 5 MIN. QNH PRESSURE IN HPA 1008.7 1004.3 1001.9 1010.8 1010.0 1011.4 1013.8 1012.6 1016.1 1016.6 1010.2 997.1 997.1 DAY 29 2 3 30 1 24 1 29 4 20 20 27 MEAN QFF PRESSURE IN HPA 1024.4 1025.0 1014.6 1015.9 1013.0 1007.4 1006.5 1008.5 1014.2 1020.0 1021.0 1021.2 1016.0 MAX. QFF PRESSURE IN HPA 1046.1 1047.8 1026.0 1029.7 1023.4 1011.8 1013.4 1016.2 1020.5 1027.6 1032.5 1039.9 1047.8 DAY 3 7 17 9 5 27 27 21 25 16 6 29 MIN. QFF PRESSURE IN HPA 1012.5 1005.1 999.7 1005.3 1003.0 999.4 999.5 1001.3 1007.1 1007.5 1008.3 997.8 997.8 DAY 26 2 3 30 1 15 15 1 4 20 20 27 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 819.4 818.9 816.3 821.0 820.9 819.4 819.5 820.4 822.9 824.7 822.2 819.6 820.4 MAX. QFE PRESSURE IN HPA 827.8 827.0 824.9 829.0 825.8 823.8 823.1 826.2 828.0 830.0 830.0 825.6 830.0 DAY 10 6 17 8 17 12 31 21 21 28 6 5 MIN. QFE PRESSURE IN HPA 813.0 809.0 807.1 815.1 813.5 814.0 816.0 815.5 818.3 818.6 815.0 803.0 803.0 DAY 26 2 3 30 1 24 1 29 4 30 28 27 MEAN QNH PRESSURE IN HPA 1017.8 1017.2 1014.2 1019.8 1019.7 1017.9 1018.0 1019.1 1022.1 1024.2 1021.2 1018.1 1019.1 MAX. QNH PRESSURE IN HPA 1027.9 1026.9 1024.4 1029.3 1025.5 1023.1 1022.3 1026.0 1028.1 1030.5 1030.5 1025.3 1030.5 DAY 10 6 17 8 17 12 31 21 21 28 6 5 MIN. QNH PRESSURE IN HPA 1010.2 1005.5 1003.2 1012.7 1010.8 1011.4 1013.8 1013.2 1016.6 1016.9 1012.6 998.3 998.3 DAY 26 2 3 30 1 24 1 29 4 30 28 27 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 819.1 819.0 816.2 820.9 820.7 819.1 819.5 820.0 822.7 824.3 821.8 819.2 820.2 MAX. QFE PRESSURE IN HPA 828.3 828.0 824.0 829.0 825.7 824.1 823.1 825.8 828.7 830.0 829.7 825.5 830.0 DAY 10 6 17 8 5 12 31 13 21 28 5 21 MIN. QFE PRESSURE IN HPA 813.0 810.0 806.6 815.4 812.7 813.4 816.1 814.8 818.0 817.4 814.9 803.0 803.0 DAY 26 1 4 30 1 24 1 29 4 30 28 27 MEAN QNH PRESSURE IN HPA 1017.5 1017.4 1014.1 1019.6 1019.4 1017.6 1018.0 1018.5 1021.8 1023.7 1020.7 1017.6 1018.8 MAX. QNH PRESSURE IN HPA 1028.5 1028.1 1023.4 1029.3 1025.4 1023.5 1022.3 1025.5 1029.0 1030.5 1030.2 1025.1 1030.5 DAY 10 6 17 8 5 12 31 13 21 28 5 21 MIN. QNH PRESSURE IN HPA 1010.2 1006.7 1002.6 1013.1 1009.9 1010.7 1013.9 1012.4 1016.2 1015.5 1012.5 998.3 998.3 DAY 26 1 4 30 1 24 1 29 4 30 28 27 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 818.7 818.4 815.5 820.1 820.0 818.5 819.1 819.5 822.0 823.7 821.1 818.8 819.6 MAX. QFE PRESSURE IN HPA 828.1 826.8 823.0 829.1 825.7 823.4 823.0 825.0 827.1 829.5 829.7 825.9 829.7 DAY 10 6 16 8 5 12 27 13 30 28 5 21 MIN. QFE PRESSURE IN HPA 812.0 808.0 804.2 815.0 812.0 813.0 816.0 813.6 818.0 816.6 814.3 804.2 804.2 DAY 28 1 4 30 1 24 8 29 4 30 19 26 MEAN QNH PRESSURE IN HPA 1017.0 1016.7 1013.3 1018.7 1018.6 1016.8 1017.5 1018.0 1021.0 1022.9 1019.9 1017.1 1018.1 MAX. QNH PRESSURE IN HPA 1028.2 1026.7 1022.2 1029.4 1025.4 1022.6 1022.2 1024.5 1027.1 1029.9 1030.2 1025.6 1030.2 DAY 10 6 16 8 5 12 27 13 30 28 5 21 MIN. QNH PRESSURE IN HPA 1009.0 1004.3 999.7 1012.6 1009.0 1010.2 1013.8 1011.0 1016.2 1014.5 1011.8 999.7 999.7 DAY 28 1 4 30 1 24 8 29 4 30 19 26 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 818.8 818.7 815.8 820.1 820.2 818.7 819.2 819.7 822.1 823.8 821.3 819.1 819.8 MAX. QFE PRESSURE IN HPA 827.0 827.0 824.0 829.1 826.0 823.2 822.9 825.2 827.5 829.5 829.9 825.9 829.9 DAY 2 6 16 8 4 12 27 20 30 28 5 21 MIN. QFE PRESSURE IN HPA 811.9 808.0 803.6 813.0 814.2 812.4 816.2 813.0 817.9 816.6 815.0 805.8 803.6 DAY 28 1 4 30 1 24 8 29 4 30 19 26 MEAN QNH PRESSURE IN HPA 1017.1 1017.0 1013.6 1018.7 1018.8 1017.0 1017.6 1018.3 1021.1 1023.1 1020.2 1017.5 1018.3 MAX. QNH PRESSURE IN HPA 1026.9 1026.9 1023.4 1029.4 1025.7 1022.4 1022.0 1024.8 1027.5 1029.9 1030.4 1025.6 1030.4 DAY 2 6 16 8 4 12 27 20 30 28 5 21 MIN. QNH PRESSURE IN HPA 1008.9 1004.3 999.0 1010.2 1011.7 1009.5 1014.1 1010.2 1016.1 1014.5 1012.6 1001.7 999.0 DAY 28 1 4 30 1 24 8 29 4 30 19 26 MEAN QFF PRESSURE IN HPA 1024.7 1025.5 1015.0 1015.9 1012.5 1007.0 1006.3 1008.1 1013.8 1019.6 1020.9 1021.9 1015.9 MAX. QFF PRESSURE IN HPA 1044.4 1048.9 1026.1 1030.9 1024.8 1012.5 1014.4 1015.0 1022.8 1028.4 1032.2 1039.9 1048.9 DAY 2 6 16 8 5 26 27 13 30 16 5 29 MIN. QFF PRESSURE IN HPA 1011.5 1003.3 1000.3 1003.7 1003.9 998.6 1001.2 1000.6 1006.8 1010.1 1008.5 1000.9 998.6 DAY 31 1 4 30 27 15 14 29 4 30 19 26 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -9.1 -7.8 2.9 11.0 14.7 20.1 22.5 21.9 17.0 12.6 6.0 0.5 9.4 MINIMUN AIR TEMPERATURE (C) -17.0 -18.2 -3.5 0.6 3.7 8.6 14.4 13.1 5.0 3.9 0.9 -5.1 0.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 31 27 13 2 1 0 0 0 0 1 2 19 96 DAYS WITH FREEZING MIN.<= 0 31 28 26 15 3 0 0 0 3 8 12 28 154 TEMPERATURE RECORDS LOWEST(C) -26.5 -27.5 -13.5 -5.5 -4.2 3.4 8.4 7.4 -1.6 -4.2 -10.6 -13.0 -27.5 DAY 30 3 31 24 1 2 8 30 21 25 22 6 MAXIMUM AIR TEMPERATURE (C) -3.9 -1.2 6.7 16.2 20.0 25.1 26.8 26.9 23.3 17.5 9.7 4.6 14.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 4 5 13 7 0 0 0 29 DAYS WITH MAXIMUM TEMP. <= 0 28 15 3 0 0 0 0 0 0 0 0 2 48 TEMPERATURE RECORDS HIGHEST(C) 1.0 6.0 15.4 23.4 26.4 31.5 32.0 32.8 31.8 24.8 15.5 9.4 32.8 DAY 19 28 25 21 24 29 20 8 1 6 29 25 DIF. BETWEEN (MAX.-MIN.) (C) 13.1 17.0 10.2 15.6 16.3 16.5 12.4 13.8 18.3 13.6 8.8 9.7 13.8 MEAN DAILY TEMP. (MDT) (C) -10.5 -9.7 1.6 8.4 11.8 16.8 20.6 20.0 14.2 10.7 5.3 -0.2 7.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 3.8 19.0 19.9 0.0 0.3 0.0 0.0 43.0 HEATING DEG. DAYS(BASE 18 0C) 882.4 774.5 507.3 288.0 192.1 54.0 1.5 11.2 123.1 230.5 381.8 565.5 4011.9 DEWPOINT (MEAN C) -11.9 -12.1 -1.1 1.1 4.1 7.7 11.7 12.4 7.2 4.4 1.0 -3.1 1.8 MIXING RATIO (G/KG) 2.01 2.00 4.41 5.23 6.43 8.34 10.80 11.35 8.02 6.48 5.17 3.82 6.17 VAPOUR PRESSURE (HPA) 2.63 2.64 5.76 6.86 8.40 10.84 13.99 14.69 10.44 8.50 6.78 5.00 8.04 SATURATION DEF. (HPA) 0.70 1.24 2.14 7.20 9.38 14.01 14.05 13.05 11.23 7.37 2.91 1.58 7.07 RELATIVE HUMIDITY (MEAN %) 82 74 78 57 54 50 54 59 59 64 72 79 65 RELATIVE HUMIDITY (MAX. %) 93 92 96 91 91 83 76 87 96 90 90 95 90 RELATIVE HUMIDITY (MIN. %) 69 57 63 35 34 31 40 44 38 47 56 62 48 RELATIVE HUMIDITY (MEAN% 03UTC) 92 91 93 90 91 83 74 84 94 87 84 94 88 RELATIVE HUMIDITY (MEAN% 09UTC) 71 59 69 41 39 41 46 50 46 51 62 68 54 RELATIVE HUMIDITY (MEAN% 15UTC) 84 75 77 55 49 41 52 57 53 64 73 81 63 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 16.0 19.0 48.8 17.8 36.5 2.0 0.0 9.0 8.0 38.8 22.8 22.2 240.9 DAYS WITH PRECIPITATION >=10 0 0 2 0 1 0 0 0 0 2 0 0 5 DAYS WITH PRECIPITATION >= 5 0 1 4 2 3 0 0 1 0 3 2 0 16 DAYS WITH PRECIPITATION >= 1 9 5 10 5 6 1 0 1 2 5 5 7 56 DAYS WITH PRECIPITATION 12 6 13 6 9 1 0 3 2 6 5 7 70 GREATEST DAILY PRECIPITATION 3.0 7.0 12.0 5.0 11.0 2.0 0.0 8.0 4.0 15.0 9.0 4.0 15.0 DAY 3 2 30 7 18 9 ** 18 19 30 1 12 DAY WITH THUNDER STORM 0 0 1 1 4 0 0 1 0 1 0 0 8 DAYS WITH SNOW OR SLEET 8 5 6 1 0 0 0 0 0 0 1 5 26 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 90 90 90 270 270 90 90 90 90 90 225 270 90 PREVAILING WIND SPEED(KNOTS) 10.3 12.9 7.8 7.1 6.1 7.5 12.6 10.2 9.4 8.9 12.0 7.4 9.8 PREVAILING WIND PERCENT 21.9 15.7 18.7 22.7 20.6 29.3 52.9 38.1 21.3 24.5 20.0 12.3 22.1 CALMS PERCENT OF WIND 67.7 75.0 58.1 43.3 52.9 40.7 21.3 37.4 55.3 42.6 45.3 69.7 50.6 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 83 87 100 336 244 80 96 102 115 195 240 204 109 VECTOR WIND MAGNITUDE(KNOTS) 2.1 1.7 0.7 0.5 0.9 2.0 9.0 5.2 1.7 0.9 3.7 1.2 1.5 WIND STEADINESES (MEAN %) 77.8 65.4 26.9 11.9 31.0 50.0 90.9 80.0 47.2 16.4 67.3 44.4 34.1 WIND SPEED (MEAN KNOTS) 2.7 2.6 2.6 4.2 2.9 4.0 9.9 6.5 3.6 5.5 5.5 2.7 4.4 FASTEST WIND DIRECTION 90 90 80 90 190 90 120 80 110 270 240 220 220 FASTEST WIND SPEED (KNOTS) 17 27 16 19 17 16 27 27 17 25 27 29 29 DAY 3 11 11 4 5 20 10 3 8 7 21 10 DAYS WITH SKY CLEAR (0-2)/8 14 14 5 10 16 27 31 16 24 19 8 11 195 DAYS WITH P.CLOUDY (3-6)/8 11 8 9 15 12 3 0 13 5 6 16 13 111 DAYS WITH CLOUDY (7-8)/8 6 6 17 5 3 0 0 2 1 6 6 7 59 DAYS WITH VISIBILITY =< 2 KM 4 5 6 0 0 0 0 0 0 0 0 0 15 DURATION OF SUNSHINE HOURS 148.8 168.5 127.6 259.0 300.2 351.6 368.3 297.5 297.5 217.1 149.7 123.1 2808.9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 819.2 821.6 818.1 822.7 822.0 819.7 820.7 820.4 821.5 824.1 822.4 820.1 821.1 MAX. QFE PRESSURE IN HPA 826.0 828.3 824.1 826.7 827.0 823.2 825.0 826.0 829.1 830.0 827.2 826.0 830.0 DAY-HOUR 22- 6 25- 6 6- 6 20- 6 21- 6 6- 9 10- 3 19- 3 22- 6 27- 6 8- 6 18- 6 MIN. QFE PRESSURE IN HPA 810.0 813.5 805.6 817.8 814.6 812.8 814.0 814.0 814.2 817.0 817.0 813.8 805.6 DAY-HOUR 17- 3 23- 6 29-12 14- 3 6-15 16-15 5-15 1-12 13-15 1-15 19-12 5- 3 MEAN QNH PRESSURE IN HPA 1017.6 1020.5 1016.3 1021.8 1021.0 1018.2 1019.4 1019.1 1020.4 1023.5 1021.5 1018.7 1019.8 MAX. QNH PRESSURE IN HPA 1025.7 1028.5 1023.5 1026.6 1026.9 1022.4 1024.5 1025.7 1029.4 1030.5 1027.2 1025.7 1030.5 DAY-HOUR 22- 6 25- 6 6- 6 20- 6 21- 6 6- 9 10- 3 19- 3 22- 6 27- 6 8- 6 18- 6 MIN. QNH PRESSURE IN HPA 1006.7 1010.8 1001.4 1016.0 1012.1 1010.0 1011.4 1011.4 1011.7 1015.0 1015.0 1011.2 1001.4 DAY-HOUR 17- 3 23- 6 29-12 14- 3 6-15 16-15 5-15 1-12 13-15 1-15 19-12 5- 3 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 818.7 821.2 817.8 822.6 822.2 819.9 820.9 820.7 821.8 824.0 822.2 819.9 821.0 MAX. QFE PRESSURE IN HPA 824.6 826.6 823.0 826.0 826.0 823.0 825.0 826.0 828.4 829.0 826.2 825.0 829.0 DAY 22 25 8 11 20 6 10 19 23 27 9 20 MIN. QFE PRESSURE IN HPA 810.0 813.8 806.8 817.8 816.0 815.0 816.0 815.0 817.0 818.0 817.0 813.8 806.8 DAY 17 1 29 14 7 10 6 1 13 2 20 5 MEAN QNH PRESSURE IN HPA 1017.1 1020.0 1016.0 1021.7 1021.2 1018.4 1019.7 1019.4 1020.7 1023.4 1021.3 1018.5 1019.8 MAX. QNH PRESSURE IN HPA 1024.1 1026.5 1022.2 1025.7 1025.7 1022.2 1024.5 1025.7 1028.6 1029.3 1026.0 1024.5 1029.3 DAY 22 25 8 11 20 6 10 19 23 27 9 20 MIN. QNH PRESSURE IN HPA 1006.7 1011.2 1002.8 1016.0 1013.8 1012.6 1013.8 1012.6 1015.0 1016.2 1015.0 1011.2 1002.8 DAY 17 1 29 14 7 10 6 1 13 2 20 5 MEAN QFF PRESSURE IN HPA 1030.2 1033.4 1017.7 1018.9 1015.1 1008.0 1006.8 1007.4 1013.4 1018.8 1020.6 1022.5 1017.7 MAX. QFF PRESSURE IN HPA 1041.7 1045.8 1027.6 1025.7 1024.0 1013.8 1013.7 1018.7 1028.6 1028.6 1031.1 1029.8 1045.8 DAY 30 4 12 20 1 13 10 19 23 24 22 18 MIN. QFF PRESSURE IN HPA 1018.2 1020.5 1004.6 1011.2 1005.1 1000.9 999.5 999.0 1002.8 1006.5 1012.2 1012.3 999.0 DAY 2 19 29 15 31 30 5 1 13 2 30 13 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 819.7 822.1 818.8 823.2 822.6 820.3 821.3 821.1 822.3 824.8 823.1 820.8 821.7 MAX. QFE PRESSURE IN HPA 826.0 828.3 824.1 826.7 827.0 823.0 825.0 826.0 829.1 830.0 827.2 826.0 830.0 DAY 22 25 6 20 21 6 10 19 22 27 8 18 MIN. QFE PRESSURE IN HPA 811.0 813.5 808.2 819.1 816.0 815.0 816.1 815.0 817.8 818.1 818.4 815.2 808.2 DAY 17 23 29 15 7 10 5 1 13 2 18 5 MEAN QNH PRESSURE IN HPA 1018.3 1021.1 1017.1 1022.4 1021.6 1019.0 1020.1 1019.9 1021.3 1024.3 1022.3 1019.5 1020.6 MAX. QNH PRESSURE IN HPA 1025.7 1028.5 1023.5 1026.6 1026.9 1022.2 1024.5 1025.7 1029.4 1030.5 1027.2 1025.7 1030.5 DAY 22 25 6 20 21 6 10 19 22 27 8 18 MIN. QNH PRESSURE IN HPA 1007.9 1010.8 1004.5 1017.5 1013.8 1012.6 1013.9 1012.6 1016.0 1016.3 1016.7 1012.9 1004.5 DAY 17 23 29 15 7 10 5 1 13 2 18 5 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 819.6 822.1 818.6 823.1 822.4 820.1 820.9 820.6 821.9 824.2 822.5 820.2 821.3 MAX. QFE PRESSURE IN HPA 825.6 827.6 824.0 826.3 826.9 823.2 825.0 825.8 829.0 829.0 826.6 825.6 829.0 DAY 22 8 6 20 21 6 10 19 22 23 8 18 MIN. QFE PRESSURE IN HPA 812.0 814.2 806.5 819.2 815.9 815.0 815.6 814.8 816.0 819.0 817.3 815.0 806.5 DAY 17 23 29 14 7 10 5 2 13 1 15 8 MEAN QNH PRESSURE IN HPA 1018.1 1021.1 1016.9 1022.3 1021.4 1018.6 1019.7 1019.3 1020.8 1023.6 1021.6 1018.8 1020.2 MAX. QNH PRESSURE IN HPA 1025.3 1027.6 1023.4 1026.1 1026.8 1022.4 1024.5 1025.5 1029.3 1029.3 1026.5 1025.3 1029.3 DAY 22 8 6 20 21 6 10 19 22 23 8 18 MIN. QNH PRESSURE IN HPA 1009.0 1011.7 1002.5 1017.6 1013.7 1012.6 1013.3 1012.4 1013.8 1017.4 1015.4 1012.6 1002.5 DAY 17 23 29 14 7 10 5 2 13 1 15 8 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 818.9 821.3 817.7 822.4 821.6 819.4 820.3 819.9 821.0 823.6 822.0 819.7 820.6 MAX. QFE PRESSURE IN HPA 825.0 826.3 823.0 825.8 826.2 823.0 824.0 825.0 829.0 828.8 826.2 825.8 829.0 DAY 21 5 6 9 20 6 10 19 22 23 8 18 MIN. QFE PRESSURE IN HPA 812.9 814.1 805.6 818.2 815.0 814.0 814.8 814.0 814.6 817.6 817.0 815.0 805.6 DAY 17 1 29 13 7 10 5 1 13 1 19 8 MEAN QNH PRESSURE IN HPA 1017.3 1020.1 1015.9 1021.4 1020.5 1017.9 1018.9 1018.5 1019.8 1022.9 1021.0 1018.2 1019.4 MAX. QNH PRESSURE IN HPA 1024.5 1026.1 1022.2 1025.5 1026.0 1022.2 1023.4 1024.5 1029.3 1029.1 1026.0 1025.5 1029.3 DAY 21 5 6 9 20 6 10 19 22 23 8 18 MIN. QNH PRESSURE IN HPA 1010.1 1011.6 1001.4 1016.4 1012.6 1011.4 1012.4 1011.4 1012.1 1015.7 1015.0 1012.6 1001.4 DAY 17 1 29 13 7 10 5 1 13 1 19 8 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 819.1 821.5 817.8 822.5 821.5 818.9 820.1 819.9 820.7 823.9 822.2 820.0 820.7 MAX. QFE PRESSURE IN HPA 825.0 826.8 823.0 826.1 826.3 822.9 824.2 825.4 829.0 828.8 826.4 826.0 829.0 DAY 21 5 6 10 20 6 9 18 22 23 7 18 MIN. QFE PRESSURE IN HPA 813.0 814.6 807.5 818.1 814.6 812.8 814.0 814.0 814.2 817.0 817.0 815.0 807.5 DAY 2 1 28 13 6 16 5 1 13 1 19 4 MEAN QNH PRESSURE IN HPA 1017.5 1020.4 1016.0 1021.5 1020.3 1017.3 1018.7 1018.4 1019.4 1023.2 1021.3 1018.6 1019.4 MAX. QNH PRESSURE IN HPA 1024.5 1026.7 1022.2 1025.9 1026.1 1022.0 1023.6 1025.0 1029.3 1029.1 1026.2 1025.7 1029.3 DAY 21 5 6 10 20 6 9 18 22 23 7 18 MIN. QNH PRESSURE IN HPA 1010.2 1012.1 1003.7 1016.3 1012.1 1010.0 1011.4 1011.4 1011.7 1015.0 1015.0 1012.6 1003.7 DAY 2 1 28 13 6 16 5 1 13 1 19 4 MEAN QFF PRESSURE IN HPA 1030.5 1033.5 1017.6 1018.5 1014.1 1006.7 1005.8 1006.2 1012.0 1018.6 1020.4 1022.6 1017.2 MAX. QFF PRESSURE IN HPA 1044.9 1046.2 1027.3 1026.4 1021.1 1013.8 1013.4 1017.0 1027.2 1030.0 1030.0 1031.3 1046.2 DAY 30 3 12 30 1 6 10 18 22 23 22 18 MIN. QFF PRESSURE IN HPA 1017.3 1022.8 1004.0 1011.7 1002.8 996.3 997.5 997.7 1000.1 1008.0 1012.8 1014.9 996.3 DAY 2 27 28 15 6 16 5 2 13 2 30 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -6.7 -3.7 1.7 7.4 14.1 20.0 21.2 19.8 18.7 10.5 7.2 0.3 9.2 MINIMUN AIR TEMPERATURE (C) -14.3 -9.2 -4.8 -0.2 4.2 8.0 13.1 12.2 6.5 1.9 -1.5 -6.3 0.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 26 23 16 5 0 0 0 0 0 0 11 17 98 DAYS WITH FREEZING MIN.<= 0 31 28 25 16 4 0 0 0 0 15 22 28 169 TEMPERATURE RECORDS LOWEST(C) -27.6 -24.6 -20.6 -10.2 -2.2 3.4 4.0 7.0 1.2 -3.6 -6.4 -21.6 -27.6 DAY 26 5 18 3 4 1 8 25 22 19 25 28 MAXIMUM AIR TEMPERATURE (C) -1.7 0.0 6.2 12.3 18.8 25.1 25.8 24.6 25.3 16.0 13.0 5.1 14.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 2 11 6 0 0 0 0 19 DAYS WITH MAXIMUM TEMP. <= 0 21 16 3 0 0 0 0 0 0 0 0 6 46 TEMPERATURE RECORDS HIGHEST(C) 4.2 5.6 11.4 22.6 24.6 30.0 34.2 32.8 29.6 22.2 19.0 14.8 34.2 DAY 22 17 31 27 17 3 27 4 14 11 3 3 DIF. BETWEEN (MAX.-MIN.) (C) 12.6 9.2 11.0 12.5 14.6 17.1 12.7 12.4 18.8 14.1 14.5 11.4 13.4 MEAN DAILY TEMP. (MDT) (C) -8.0 -4.6 0.7 6.0 11.5 16.5 19.5 18.4 15.9 8.9 5.7 -0.6 7.5 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.0 30.8 8.6 0.0 0.0 0.0 0.0 40.5 HEATING DEG. DAYS(BASE 18 0C) 806.3 632.7 520.1 358.6 200.9 54.6 37.1 29.9 65.0 281.2 368.8 576.7 3931.9 DEWPOINT (MEAN C) -9.8 -6.3 -2.3 1.3 3.6 7.3 10.7 11.0 6.0 2.7 -0.8 -4.1 1.6 MIXING RATIO (G/KG) 2.43 3.04 4.12 5.30 6.29 8.02 10.28 10.22 7.42 5.83 4.52 3.74 5.93 VAPOUR PRESSURE (HPA) 3.19 3.97 5.41 6.91 8.21 10.42 13.31 13.26 9.67 7.65 5.94 4.91 7.74 SATURATION DEF. (HPA) 0.83 0.91 1.99 4.22 8.77 14.20 13.25 10.96 13.53 5.86 4.97 2.10 6.80 RELATIVE HUMIDITY (MEAN %) 81 83 77 70 55 49 56 61 50 63 61 76 65 RELATIVE HUMIDITY (MAX. %) 93 94 96 95 81 80 77 82 87 90 88 92 88 RELATIVE HUMIDITY (MIN. %) 67 72 62 53 40 35 43 48 30 42 40 60 49 RELATIVE HUMIDITY (MEAN% 03UTC) 88 91 92 94 80 79 74 81 85 88 86 89 86 RELATIVE HUMIDITY (MEAN% 09UTC) 72 78 70 63 47 41 48 52 36 52 45 67 56 RELATIVE HUMIDITY (MEAN% 15UTC) 83 83 76 62 49 41 54 59 45 61 59 76 62 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 42.9 30.7 48.7 102.6 46.8 0.4 0.0 0.0 0.0 15.2 58.8 37.1 383.2 DAYS WITH PRECIPITATION >=10 1 0 0 4 2 0 0 0 0 0 2 1 10 DAYS WITH PRECIPITATION >= 5 3 2 4 7 4 0 0 0 0 1 2 2 25 DAYS WITH PRECIPITATION >= 1 9 6 11 13 4 0 0 0 0 4 3 6 56 DAYS WITH PRECIPITATION 13 10 13 19 5 1 0 0 0 7 3 7 78 GREATEST DAILY PRECIPITATION 10.2 9.0 8.0 25.0 15.0 0.4 0.0 0.0 0.0 6.2 29.8 25.0 29.8 DAY 25 4 8 29 16 11 ** ** ** 29 12 6 DAY WITH THUNDER STORM 0 0 1 2 0 0 0 0 0 1 1 0 5 DAYS WITH SNOW OR SLEET 11 9 8 4 0 0 0 0 0 2 0 6 40 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 90 90 90 270 90 90 90 90 90 90 270 270 90 PREVAILING WIND SPEED(KNOTS) 8.6 8.4 9.5 9.3 9.7 11.3 11.3 9.9 10.3 9.3 6.5 7.6 10.2 PREVAILING WIND PERCENT 12.9 19.3 20.0 26.0 18.7 17.3 58.7 53.5 29.3 23.2 14.7 15.5 22.5 CALMS PERCENT OF WIND 75.5 52.1 54.8 46.7 34.8 40.7 20.0 26.5 51.3 51.6 68.0 61.9 48.6 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 104 110 118 258 179 109 92 92 96 119 243 236 112 VECTOR WIND MAGNITUDE(KNOTS) 1.2 1.4 1.7 2.8 1.9 2.2 8.2 6.3 2.1 1.1 2.2 0.8 1.6 WIND STEADINESES (MEAN %) 63.2 31.8 41.5 50.0 29.2 40.0 93.2 86.3 47.7 27.5 88.0 21.1 32.7 WIND SPEED (MEAN KNOTS) 1.9 4.4 4.1 5.6 6.5 5.5 8.8 7.3 4.4 4.0 2.5 3.8 4.9 FASTEST WIND DIRECTION 110 120 120 90 210 70 90 90 90 90 240 330 210 FASTEST WIND SPEED (KNOTS) 23 37 27 35 47 31 27 27 17 19 23 33 47 DAY 5 19 5 2 2 30 1 8 15 4 9 5 DAYS WITH SKY CLEAR (0-2)/8 10 6 12 6 20 25 19 24 29 16 14 11 192 DAYS WITH P.CLOUDY (3-6)/8 10 10 7 13 7 5 11 6 1 12 15 12 109 DAYS WITH CLOUDY (7-8)/8 11 12 12 11 4 0 1 1 0 3 1 8 64 DAYS WITH VISIBILITY =< 2 KM 2 1 2 2 0 0 0 0 0 1 0 3 11 DURATION OF SUNSHINE HOURS 121.0 110.3 187.6 183.1 312.3 353.6 326.9 340.8 322.6 185.2 ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 820.3 817.7 822.1 818.3 820.9 819.2 819.7 820.3 821.0 824.1 823.5 821.3 820.7 MAX. QFE PRESSURE IN HPA 828.0 826.1 830.2 824.6 826.0 823.9 823.2 825.0 826.8 831.4 831.7 828.6 831.7 DAY-HOUR 26- 9 8- 9 16-15 23- 6 16- 6 8- 6 16- 6 29- 3 27- 6 15- 6 23- 6 28-15 MIN. QFE PRESSURE IN HPA 811.8 807.0 816.0 810.0 812.8 811.0 814.7 814.2 817.0 818.7 815.6 813.0 807.0 DAY-HOUR 17-15 15-15 11-12 1-12 2- 9 26-15 29-12 7-12 5- 3 31-15 9-12 25- 3 MEAN QNH PRESSURE IN HPA 1019.0 1015.9 1021.1 1016.6 1019.6 1017.6 1018.2 1019.0 1019.8 1023.5 1022.7 1020.2 1019.4 MAX. QNH PRESSURE IN HPA 1028.1 1025.9 1030.7 1024.1 1025.7 1023.2 1022.4 1024.5 1026.7 1032.2 1032.5 1028.8 1032.5 DAY-HOUR 26- 9 8- 9 16-15 23- 6 16- 6 8- 6 16- 6 29- 3 27- 6 15- 6 23- 6 28-15 MIN. QNH PRESSURE IN HPA 1008.8 1003.1 1013.8 1006.7 1010.0 1007.9 1012.3 1011.7 1015.0 1017.0 1013.3 1010.2 1003.1 DAY-HOUR 17-15 15-15 11-12 1-12 2- 9 26-15 29-12 7-12 5- 3 31-15 9-12 25- 3 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 819.8 817.2 821.8 817.9 820.8 819.4 819.8 820.6 821.2 823.9 823.3 820.9 820.5 MAX. QFE PRESSURE IN HPA 826.3 825.0 829.3 824.4 825.9 823.0 823.0 825.0 825.8 830.0 831.0 827.0 831.0 DAY 27 8 17 25 16 1 17 29 27 16 23 28 MIN. QFE PRESSURE IN HPA 811.8 809.0 816.5 811.2 813.8 811.9 817.0 815.0 817.0 818.8 817.2 813.0 809.0 DAY 23 16 5 2 13 27 27 7 5 26 1 25 MEAN QNH PRESSURE IN HPA 1018.4 1015.3 1020.7 1016.1 1019.6 1017.9 1018.3 1019.3 1020.0 1023.3 1022.5 1019.6 1019.2 MAX. QNH PRESSURE IN HPA 1026.1 1024.5 1029.7 1023.8 1025.6 1022.2 1022.2 1024.5 1025.5 1030.5 1031.7 1026.9 1031.7 DAY 27 8 17 25 16 1 17 29 27 16 23 28 MIN. QNH PRESSURE IN HPA 1008.8 1005.5 1014.4 1008.1 1011.2 1008.9 1015.0 1012.6 1015.0 1017.2 1015.2 1010.2 1005.5 DAY 23 16 5 2 13 27 27 7 5 26 1 25 MEAN QFF PRESSURE IN HPA 1028.9 1022.5 1023.8 1014.4 1013.3 1007.2 1006.4 1008.7 1011.9 1020.6 1022.5 1024.2 1017.1 MAX. QFF PRESSURE IN HPA 1048.3 1035.0 1042.9 1027.8 1022.3 1015.6 1013.6 1016.6 1018.3 1033.5 1034.0 1042.9 1048.3 DAY 27 1 17 3 16 1 31 29 28 16 14 28 MIN. QFF PRESSURE IN HPA 1012.1 1007.3 1013.1 1002.9 1002.3 994.6 1000.1 998.9 1005.2 1011.5 1010.5 1015.2 994.6 DAY 23 16 14 29 2 27 22 7 10 1 10 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 820.5 818.1 822.5 818.7 821.2 819.8 820.0 820.9 821.6 824.7 824.1 821.8 821.2 MAX. QFE PRESSURE IN HPA 827.0 825.9 829.3 824.6 826.0 823.9 823.2 825.0 826.8 831.4 831.7 827.5 831.7 DAY 26 8 17 23 16 8 16 29 27 15 23 28 MIN. QFE PRESSURE IN HPA 813.0 810.7 817.6 811.4 814.0 812.2 816.7 815.8 817.0 820.0 818.3 814.8 810.7 DAY 23 15 14 1 2 27 29 7 5 26 12 25 MEAN QNH PRESSURE IN HPA 1019.2 1016.3 1021.6 1017.0 1020.1 1018.4 1018.6 1019.6 1020.5 1024.2 1023.5 1020.8 1020.0 MAX. QNH PRESSURE IN HPA 1026.9 1025.6 1029.7 1024.1 1025.7 1023.2 1022.4 1024.5 1026.7 1032.2 1032.5 1027.5 1032.5 DAY 26 8 17 23 16 8 16 29 27 15 23 28 MIN. QNH PRESSURE IN HPA 1010.2 1007.5 1015.7 1008.3 1011.4 1009.3 1014.7 1013.6 1015.0 1018.6 1016.6 1012.4 1007.5 DAY 23 15 14 1 2 27 29 7 5 26 12 25 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 820.7 818.1 822.6 818.7 821.1 819.5 819.9 820.5 821.1 824.3 823.4 821.5 820.9 MAX. QFE PRESSURE IN HPA 828.0 826.1 829.4 824.6 825.5 823.9 822.9 825.0 826.0 831.4 830.2 827.3 831.4 DAY 26 8 9 25 16 8 8 29 27 15 22 28 MIN. QFE PRESSURE IN HPA 813.0 810.0 816.8 810.8 812.8 812.2 815.5 815.2 817.0 820.0 816.8 816.0 810.0 DAY 23 10 14 1 2 27 29 7 5 25 9 22 MEAN QNH PRESSURE IN HPA 1019.4 1016.3 1021.7 1017.0 1019.9 1018.0 1018.4 1019.2 1020.0 1023.7 1022.7 1020.4 1019.7 MAX. QNH PRESSURE IN HPA 1028.1 1025.9 1029.8 1024.1 1025.1 1023.2 1022.0 1024.5 1025.7 1032.2 1030.7 1027.3 1032.2 DAY 26 8 9 25 16 8 8 29 27 15 22 28 MIN. QNH PRESSURE IN HPA 1010.2 1006.7 1014.8 1007.6 1010.0 1009.3 1013.2 1012.9 1015.0 1018.6 1014.8 1013.8 1006.7 DAY 23 10 14 1 2 27 29 7 5 25 9 22 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 820.2 817.5 821.8 818.2 820.6 818.7 819.4 819.8 820.4 823.8 823.1 821.1 820.4 MAX. QFE PRESSURE IN HPA 827.6 825.0 829.4 824.0 825.0 823.2 822.9 825.0 825.2 830.8 831.0 827.0 831.0 DAY 26 8 9 24 15 4 8 29 23 15 22 28 MIN. QFE PRESSURE IN HPA 812.4 807.8 816.0 810.0 813.0 811.5 814.7 814.2 817.0 819.0 815.6 815.0 807.8 DAY 17 15 11 1 2 27 29 7 5 26 9 22 MEAN QNH PRESSURE IN HPA 1018.8 1015.6 1020.8 1016.4 1019.3 1017.0 1017.8 1018.3 1019.1 1023.1 1022.3 1019.8 1019.0 MAX. QNH PRESSURE IN HPA 1027.6 1024.5 1029.8 1023.4 1024.5 1022.4 1022.0 1024.5 1024.8 1031.5 1031.7 1026.9 1031.7 DAY 26 8 9 24 15 4 8 29 23 15 22 28 MIN. QNH PRESSURE IN HPA 1009.5 1004.0 1013.8 1006.7 1010.2 1008.5 1012.3 1011.7 1015.0 1017.4 1013.3 1012.6 1004.0 DAY 17 15 11 1 2 27 29 7 5 26 9 22 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 820.6 817.7 822.1 818.2 820.6 818.4 819.3 820.0 820.6 824.0 823.4 821.5 820.5 MAX. QFE PRESSURE IN HPA 827.6 825.0 830.2 824.0 825.2 823.2 822.9 825.0 825.6 831.2 831.0 828.6 831.2 DAY 26 7 16 24 15 4 8 29 23 15 22 28 MIN. QFE PRESSURE IN HPA 811.8 807.0 816.3 810.0 812.8 811.0 815.0 814.6 817.2 818.7 816.6 814.6 807.0 DAY 17 15 31 1 12 26 27 7 20 31 9 24 MEAN QNH PRESSURE IN HPA 1019.3 1015.9 1021.0 1016.4 1019.3 1016.6 1017.8 1018.6 1019.3 1023.3 1022.7 1020.4 1019.2 MAX. QNH PRESSURE IN HPA 1027.6 1024.5 1030.7 1023.4 1024.8 1022.4 1022.0 1024.5 1025.3 1031.9 1031.7 1028.8 1031.9 DAY 26 7 16 24 15 4 8 29 23 15 22 28 MIN. QNH PRESSURE IN HPA 1008.8 1003.1 1014.2 1006.7 1010.0 1007.9 1012.6 1012.1 1015.2 1017.0 1014.5 1012.1 1003.1 DAY 17 15 31 1 12 26 27 7 20 31 9 24 MEAN QFF PRESSURE IN HPA 1029.9 1022.9 1024.0 1014.6 1012.9 1006.0 1005.8 1007.7 1011.2 1020.6 1022.8 1025.1 1017.0 MAX. QFF PRESSURE IN HPA 1050.2 1031.9 1043.4 1024.0 1021.7 1013.0 1014.7 1016.4 1019.4 1033.0 1033.6 1044.6 1050.2 DAY 26 7 16 3 15 1 31 29 23 15 23 28 MIN. QFF PRESSURE IN HPA 1010.7 1004.3 1013.2 1003.9 1002.8 994.2 997.6 997.2 1004.7 1011.8 1008.4 1012.7 994.2 DAY 4 15 31 1 2 26 27 6 10 31 9 17 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -3.3 -3.2 2.9 10.1 13.0 18.1 21.5 21.4 14.4 9.6 3.4 -3.5 8.7 MINIMUN AIR TEMPERATURE (C) -9.8 -9.7 -2.5 1.7 3.5 9.0 14.0 12.0 5.4 3.0 -2.3 -7.6 1.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 27 22 7 0 0 0 0 0 0 0 14 21 91 DAYS WITH FREEZING MIN.<= 0 31 26 24 10 4 0 0 0 2 10 20 28 155 TEMPERATURE RECORDS LOWEST(C) -17.5 -21.5 -19.0 -3.2 -2.5 2.0 4.5 6.0 -2.0 -1.0 -9.2 -16.8 -21.5 DAY 1 13 11 15 7 1 13 28 28 6 23 18 MAXIMUM AIR TEMPERATURE (C) 0.9 0.7 6.0 15.0 17.8 22.1 25.8 27.0 23.1 16.8 10.1 1.1 13.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 0 7 11 2 0 0 0 20 DAYS WITH MAXIMUM TEMP. <= 0 11 12 3 0 0 0 0 0 0 0 0 13 39 TEMPERATURE RECORDS HIGHEST(C) 5.2 8.8 19.0 22.0 22.2 27.5 32.5 35.0 33.2 21.2 15.8 7.0 35.0 DAY 7 25 29 25 28 10 6 4 1 7 4 9 DIF. BETWEEN (MAX.-MIN.) (C) 10.7 10.4 8.5 13.3 14.3 13.1 11.8 15.0 17.7 13.8 12.4 8.7 12.5 MEAN DAILY TEMP. (MDT) (C) -4.4 -4.5 1.7 8.4 10.6 15.5 19.9 19.5 14.3 9.9 3.9 -3.2 7.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 2.0 25.4 15.0 0.0 0.0 0.0 0.0 42.5 HEATING DEG. DAYS(BASE 18 0C) 695.1 629.3 503.8 289.1 228.7 89.8 21.0 15.5 116.0 250.9 423.1 658.3 3920.6 DEWPOINT (MEAN C) -5.4 -6.5 -0.3 3.7 5.1 9.8 11.2 12.1 4.8 3.5 -1.3 -6.8 2.5 MIXING RATIO (G/KG) 3.24 3.20 4.70 6.25 6.94 9.46 10.52 11.09 6.81 6.18 4.36 3.00 6.31 VAPOUR PRESSURE (HPA) 4.24 4.18 6.14 8.16 9.03 12.29 13.61 14.35 8.91 8.11 5.74 3.92 8.22 SATURATION DEF. (HPA) 0.75 1.07 1.95 5.05 6.77 9.39 13.04 12.82 9.09 4.41 2.50 1.12 5.66 RELATIVE HUMIDITY (MEAN %) 87 81 82 69 64 62 56 61 59 71 75 79 71 RELATIVE HUMIDITY (MAX. %) 97 94 96 97 91 85 73 89 90 93 94 92 91 RELATIVE HUMIDITY (MIN. %) 76 66 71 49 46 49 44 45 33 40 47 61 52 RELATIVE HUMIDITY (MEAN% 03UTC) 95 92 95 95 90 82 72 86 89 91 91 84 89 RELATIVE HUMIDITY (MEAN% 09UTC) 80 74 76 57 53 52 48 50 38 46 52 67 58 RELATIVE HUMIDITY (MEAN% 15UTC) 87 78 77 64 58 63 56 61 49 63 70 80 67 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 12.9 16.4 57.4 48.4 46.8 4.8 1.7 0.0 0.0 30.3 20.9 77.1 316.7 DAYS WITH PRECIPITATION >=10 0 0 1 1 1 0 0 0 0 1 0 1 5 DAYS WITH PRECIPITATION >= 5 1 1 4 3 2 0 0 0 0 3 2 4 20 DAYS WITH PRECIPITATION >= 1 3 4 10 9 8 1 1 0 0 5 5 10 56 DAYS WITH PRECIPITATION 8 7 12 13 11 4 3 0 0 9 7 15 89 GREATEST DAILY PRECIPITATION 5.0 6.0 22.0 12.0 27.0 3.0 1.0 0.0 0.0 10.0 7.0 46.0 46.0 DAY 22 28 23 4 15 8 17 ** ** 22 4 9 DAY WITH THUNDER STORM 0 1 0 1 3 3 0 0 0 1 0 0 9 DAYS WITH SNOW OR SLEET 7 9 10 2 1 0 0 0 0 0 1 13 43 DAYS WITH DUST 1 0 0 0 0 0 0 0 0 0 0 0 1 WIND DIRECTION (PREVAILING) 270 225 90 225 270 90 90 90 90 90 270 270 90 PREVAILING WIND SPEED(KNOTS) 8.1 11.5 10.5 9.3 9.8 9.9 10.8 8.6 7.8 6.5 7.1 5.9 8.8 PREVAILING WIND PERCENT 11.6 15.0 15.5 22.7 17.4 48.0 49.0 43.2 22.7 11.7 6.3 7.7 18.2 CALMS PERCENT OF WIND 76.8 56.4 58.1 40.7 40.6 26.0 18.1 29.7 54.2 68.5 74.6 70.6 53.8 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 225 248 240 248 2176 VECTOR WIND DIRECTION (MEAN) 271 197 121 237 236 93 90 102 109 132 226 241 119 VECTOR WIND MAGNITUDE(KNOTS) 1.2 1.2 1.2 3.3 2.0 5.2 7.7 5.3 1.4 0.5 0.5 0.9 1.3 WIND STEADINESES (MEAN %) 66.7 30.8 33.3 61.1 39.2 76.5 88.5 93.0 41.2 25.0 33.3 45.0 31.0 WIND SPEED (MEAN KNOTS) 1.8 3.9 3.6 5.4 5.1 6.8 8.7 5.7 3.4 2.0 1.5 2.0 4.2 FASTEST WIND DIRECTION 270 240 80 270 230 80 30 120 60 210 270 190 240 FASTEST WIND SPEED (KNOTS) 23 39 31 23 31 23 31 19 17 14 12 16 39 DAY 3 17 9 10 22 19 18 22 9 27 1 4 DAYS WITH SKY CLEAR (0-2)/8 2 6 4 10 11 20 23 26 27 12 9 9 159 DAYS WITH P.CLOUDY (3-6)/8 16 9 8 11 14 9 8 5 3 12 13 9 117 DAYS WITH CLOUDY (7-8)/8 13 13 19 9 6 1 0 0 0 7 8 13 89 DAYS WITH VISIBILITY =< 2 KM 1 0 1 0 0 1 0 0 0 0 0 2 5 DURATION OF SUNSHINE HOURS ****** 143.0 106.5 220.1 272.2 319.5 344.5 345.9 317.5 209.9 130.3 90.7 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 819.9 819.7 819.2 820.5 818.4 820.7 818.9 819.8 823.2 824.8 824.1 818.5 820.6 MAX. QFE PRESSURE IN HPA 828.2 828.0 826.0 827.0 824.0 827.0 824.2 823.5 830.0 830.0 829.0 826.2 830.0 DAY-HOUR 13- 6 15- 9 29- 6 28-15 24-15 17- 6 11- 9 27- 6 15-18 13- 6 24- 6 17- 6 MIN. QFE PRESSURE IN HPA 811.2 811.0 808.1 811.0 810.4 811.5 813.2 815.8 816.5 820.4 816.0 808.4 808.1 DAY-HOUR 25- 3 4- 3 6-15 4-12 16-15 11-12 7-15 5-15 19-12 4-12 30-21 31-15 MEAN QNH PRESSURE IN HPA 1018.4 1018.2 1017.6 1019.2 1016.7 1019.4 1017.2 1018.4 1022.4 1024.4 1023.4 1016.8 1019.3 MAX. QNH PRESSURE IN HPA 1028.4 1028.1 1025.7 1026.9 1023.4 1026.9 1023.6 1022.8 1030.5 1030.5 1029.3 1026.0 1030.5 DAY-HOUR 13- 6 15- 9 29- 6 28-15 24-15 17- 6 11- 9 27- 6 15-18 13- 6 24- 6 17- 6 MIN. QNH PRESSURE IN HPA 1008.1 1007.9 1004.4 1007.9 1007.1 1008.5 1010.5 1013.6 1014.4 1019.1 1013.8 1004.8 1004.4 DAY-HOUR 25- 3 4- 3 6-15 4-12 16-15 11-12 7-15 5-15 19-12 4-12 30-21 31-15 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1014.2 1019.3 1023.3 1022.0 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1025.7 1028.1 1034.2 1037.4 ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** 27- 3 13- 3 24- 6 17-18 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1003.7 1011.9 1009.3 1007.5 ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** 19- 6 4-12 30-21 4-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 823.1 824.7 824.0 818.7 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 828.0 829.0 827.2 826.0 ****** DAY ** ** ** ** ** ** ** ** 16 13 24 17 MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 817.3 821.2 819.4 812.8 ****** DAY ** ** ** ** ** ** ** ** 19 4 5 4 MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1022.3 1024.1 1023.4 1017.0 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1028.1 1029.3 1027.2 1025.7 ****** DAY ** ** ** ** ** ** ** ** 16 13 24 17 MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1015.4 1020.0 1017.9 1010.0 ****** DAY ** ** ** ** ** ** ** ** 19 4 5 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1013.7 1018.5 1022.6 1021.6 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1023.7 1024.9 1030.2 1034.2 ****** DAY ** ** ** ** ** ** ** ** 27 13 27 18 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1005.3 1012.8 1013.9 1009.0 ****** DAY ** ** ** ** ** ** ** ** 21 26 5 1 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 819.5 819.1 818.7 820.3 818.3 820.6 818.9 820.0 823.1 824.9 824.2 818.4 820.5 MAX. QFE PRESSURE IN HPA 827.8 826.4 824.5 826.3 824.0 826.4 822.8 823.0 827.8 829.0 828.1 825.0 829.0 DAY 13 25 29 29 25 17 11 27 16 13 24 17 MIN. QFE PRESSURE IN HPA 811.2 811.0 809.0 812.0 812.0 813.0 815.0 816.2 817.5 821.6 819.2 812.0 809.0 DAY 25 4 7 5 22 11 7 11 19 4 4 4 MEAN QNH PRESSURE IN HPA 1018.0 1017.5 1017.0 1018.9 1016.6 1019.2 1017.3 1018.6 1022.3 1024.4 1023.6 1016.7 1019.2 MAX. QNH PRESSURE IN HPA 1027.9 1026.2 1024.0 1026.1 1023.4 1026.2 1021.9 1022.2 1027.9 1029.3 1028.2 1024.5 1029.3 DAY 13 25 29 29 25 17 11 27 16 13 24 17 MIN. QNH PRESSURE IN HPA 1008.1 1007.9 1005.5 1009.0 1009.0 1010.2 1012.6 1014.1 1015.6 1020.5 1017.6 1009.0 1005.5 DAY 25 4 7 5 22 11 7 11 19 4 4 4 MEAN QFF PRESSURE IN HPA 1025.2 1024.4 1018.7 1015.7 1010.7 1009.7 1005.0 1007.2 1015.2 1020.8 1024.8 1022.7 1016.7 MAX. QFF PRESSURE IN HPA 1037.2 1040.3 1033.6 1025.8 1023.1 1016.5 1012.7 1014.0 1025.7 1028.1 1033.4 1035.9 1040.3 DAY 13 14 11 14 25 18 11 28 27 13 24 18 MIN. QFF PRESSURE IN HPA 1014.9 1009.9 1005.9 1006.0 1000.2 997.8 998.8 999.3 1006.5 1015.1 1014.8 1008.1 997.8 DAY 5 4 6 10 22 11 7 6 3 15 4 1 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 820.3 819.9 819.4 820.9 818.7 820.9 819.1 820.4 823.6 825.6 824.9 819.1 821.1 MAX. QFE PRESSURE IN HPA 828.2 827.0 826.0 827.0 824.0 827.0 823.2 823.5 828.4 830.0 829.0 826.2 830.0 DAY 13 25 29 29 25 17 11 27 16 13 24 17 MIN. QFE PRESSURE IN HPA 812.0 811.4 809.0 813.2 811.6 813.0 815.0 817.0 817.0 822.2 819.8 813.0 809.0 DAY 25 4 6 4 22 11 15 11 19 4 4 4 MEAN QNH PRESSURE IN HPA 1018.9 1018.4 1017.9 1019.6 1017.1 1019.7 1017.6 1019.0 1022.9 1025.3 1024.5 1017.6 1019.9 MAX. QNH PRESSURE IN HPA 1028.4 1026.9 1025.7 1026.9 1023.4 1026.9 1022.4 1022.8 1028.6 1030.5 1029.3 1026.0 1030.5 DAY 13 25 29 29 25 17 11 27 16 13 24 17 MIN. QNH PRESSURE IN HPA 1009.0 1008.3 1005.5 1010.5 1008.6 1010.2 1012.6 1015.0 1015.0 1021.2 1018.4 1010.2 1005.5 DAY 25 4 6 4 22 11 15 11 19 4 4 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1014.6 1020.4 1024.9 1023.3 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1021.9 1027.0 1034.2 1036.2 ****** DAY ** ** ** ** ** ** ** ** 27 13 24 18 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1003.7 1015.6 1013.4 1009.4 ****** DAY ** ** ** ** ** ** ** ** 19 26 4 1 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 820.1 820.2 819.6 820.8 818.7 821.0 819.1 820.0 823.2 825.1 824.2 818.4 820.9 MAX. QFE PRESSURE IN HPA 827.0 828.0 826.0 826.6 823.8 827.0 824.2 823.5 828.2 828.9 827.8 825.2 828.9 DAY 12 15 29 28 25 17 11 27 15 20 15 17 MIN. QFE PRESSURE IN HPA 812.5 811.4 809.1 812.0 811.6 812.0 815.0 817.0 817.0 821.2 818.0 811.0 809.1 DAY 25 4 6 4 22 11 7 6 19 4 4 31 MEAN QNH PRESSURE IN HPA 1018.7 1018.9 1018.1 1019.5 1017.1 1019.7 1017.6 1018.6 1022.4 1024.7 1023.5 1016.6 1019.6 MAX. QNH PRESSURE IN HPA 1026.9 1028.1 1025.7 1026.5 1023.1 1026.9 1023.6 1022.8 1028.4 1029.2 1027.9 1024.8 1029.2 DAY 12 15 29 28 25 17 11 27 15 20 15 17 MIN. QNH PRESSURE IN HPA 1009.6 1008.3 1005.6 1009.0 1008.6 1009.0 1012.6 1015.0 1015.0 1020.0 1016.2 1007.9 1005.6 DAY 25 4 6 4 22 11 7 6 19 4 4 31 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1013.7 1018.7 1022.5 1021.1 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1020.7 1024.1 1029.5 1032.5 ****** DAY ** ** ** ** ** ** ** ** 26 20 24 17 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1004.2 1012.6 1010.2 1007.7 ****** DAY ** ** ** ** ** ** ** ** 8 4 4 1 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 819.5 819.5 819.1 820.1 818.3 820.5 818.6 819.3 822.5 824.3 823.4 818.0 820.3 MAX. QFE PRESSURE IN HPA 827.0 827.2 825.0 826.0 823.0 827.0 824.2 822.8 828.2 827.8 826.8 825.0 828.2 DAY 12 15 29 28 4 17 11 27 15 20 15 17 MIN. QFE PRESSURE IN HPA 811.8 811.0 809.1 811.0 811.0 811.5 813.5 816.0 816.5 820.4 818.4 809.0 809.0 DAY 25 4 6 4 22 11 7 10 19 4 4 31 MEAN QNH PRESSURE IN HPA 1018.0 1017.9 1017.5 1018.7 1016.5 1019.2 1016.9 1017.7 1021.6 1023.7 1022.7 1016.2 1018.9 MAX. QNH PRESSURE IN HPA 1026.9 1027.2 1024.5 1025.7 1022.2 1026.9 1023.6 1021.9 1028.4 1027.9 1026.7 1024.5 1028.4 DAY 12 15 29 28 4 17 11 27 15 20 15 17 MIN. QNH PRESSURE IN HPA 1008.8 1007.9 1005.6 1007.9 1007.9 1008.5 1010.8 1013.8 1014.4 1019.1 1016.7 1005.5 1005.5 DAY 25 4 6 4 22 11 7 10 19 4 4 31 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1013.4 1018.0 1021.8 1020.9 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1022.1 1023.8 1028.3 1032.8 ****** DAY ** ** ** ** ** ** ** ** 26 20 24 17 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1005.0 1011.9 1012.3 1007.5 ****** DAY ** ** ** ** ** ** ** ** 8 4 4 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 819.9 819.9 819.3 820.4 818.2 820.4 818.6 819.5 822.7 824.6 823.7 818.3 820.5 MAX. QFE PRESSURE IN HPA 828.0 827.0 825.0 827.0 824.0 826.4 824.0 823.0 829.0 828.8 827.1 825.4 829.0 DAY 12 15 29 28 24 17 11 27 15 12 15 17 MIN. QFE PRESSURE IN HPA 812.2 813.8 808.1 811.1 810.4 812.4 813.2 815.8 817.0 821.2 818.4 808.4 808.1 DAY 25 4 6 4 16 11 7 5 19 30 4 31 MEAN QNH PRESSURE IN HPA 1018.5 1018.5 1017.7 1019.0 1016.5 1019.1 1016.9 1018.0 1021.8 1024.1 1023.0 1016.5 1019.1 MAX. QNH PRESSURE IN HPA 1028.1 1026.9 1024.5 1026.9 1023.4 1026.2 1023.4 1022.2 1029.3 1029.1 1027.1 1025.0 1029.3 DAY 12 15 29 28 24 17 11 27 15 12 15 17 MIN. QNH PRESSURE IN HPA 1009.3 1011.2 1004.4 1008.0 1007.1 1009.5 1010.5 1013.6 1015.0 1020.0 1016.7 1004.8 1004.4 DAY 25 4 6 4 16 11 7 5 19 30 4 31 MEAN QFF PRESSURE IN HPA 1025.5 1025.3 1019.3 1015.6 1010.5 1009.4 1004.4 1006.3 1014.7 1020.3 1024.2 1022.7 1016.5 MAX. QFF PRESSURE IN HPA 1036.8 1040.2 1034.2 1025.0 1021.6 1017.4 1015.0 1013.6 1024.9 1025.4 1032.4 1037.3 1040.2 DAY 11 14 11 14 4 17 11 27 26 12 24 17 MIN. QFF PRESSURE IN HPA 1014.0 1013.8 1004.5 1005.0 997.5 999.4 997.2 998.4 1007.0 1015.2 1013.9 1008.9 997.2 DAY 4 27 6 9 16 10 7 5 7 3 4 4 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 823.8 824.9 824.1 818.5 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 830.0 829.0 827.5 825.4 ****** DAY ** ** ** ** ** ** ** ** 15 12 12 17 MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 818.0 821.3 818.0 809.0 ****** DAY ** ** ** ** ** ** ** ** 7 25 30 31 MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1023.2 1024.4 1023.4 1016.8 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1030.5 1029.3 1027.5 1025.0 ****** DAY ** ** ** ** ** ** ** ** 15 12 12 17 MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1016.2 1020.1 1016.2 1005.5 ****** DAY ** ** ** ** ** ** ** ** 7 25 30 31 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1014.6 1019.5 1023.8 1022.6 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1023.6 1023.8 1031.6 1037.4 ****** DAY ** ** ** ** ** ** ** ** 26 12 24 17 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1005.0 1015.0 1012.6 1009.8 ****** DAY ** ** ** ** ** ** ** ** 19 3 30 4 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 823.7 824.8 824.0 818.5 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 829.0 828.8 827.3 826.0 ****** DAY ** ** ** ** ** ** ** ** 15 12 15 16 MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 818.0 821.8 816.0 808.6 ****** DAY ** ** ** ** ** ** ** ** 19 3 30 31 MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1023.0 1024.4 1023.3 1016.8 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1029.3 1029.1 1027.3 1025.7 ****** DAY ** ** ** ** ** ** ** ** 15 12 15 16 MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1016.2 1020.7 1013.8 1005.0 ****** DAY ** ** ** ** ** ** ** ** 19 3 30 31 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1013.8 1018.4 1022.3 1021.5 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1022.9 1024.6 1029.0 1035.8 ****** DAY ** ** ** ** ** ** ** ** 26 12 23 17 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** 1005.2 1012.9 1009.3 1010.4 ****** DAY ** ** ** ** ** ** ** ** 20 25 30 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -8.5 -4.9 -3.5 5.6 8.8 15.2 18.9 16.0 12.8 8.3 3.5 -1.9 5.9 MINIMUN AIR TEMPERATURE (C) -14.4 -10.1 -9.8 0.4 3.4 7.3 12.1 9.9 4.6 -0.2 -1.8 -5.3 -0.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 27 24 22 1 1 0 0 0 0 3 10 16 104 DAYS WITH FREEZING MIN.<= 0 31 28 29 18 6 0 0 0 1 21 21 26 181 TEMPERATURE RECORDS LOWEST(C) -27.6 -25.6 -24.5 -4.4 -6.5 3.0 7.0 3.4 -0.5 -7.0 -14.6 -15.4 -27.6 DAY 28 29 1 8 5 5 17 31 1 8 27 29 MAXIMUM AIR TEMPERATURE (C) -2.3 -0.3 1.8 11.4 13.8 22.1 26.1 22.9 20.9 17.5 10.2 1.8 12.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 0 7 4 0 0 0 0 11 DAYS WITH MAXIMUM TEMP. <= 0 25 14 13 0 0 0 0 0 0 0 2 9 63 TEMPERATURE RECORDS HIGHEST(C) 1.8 4.6 9.4 18.5 24.8 29.5 33.0 32.6 26.8 21.6 16.8 9.4 33.0 DAY 16 24 29 12 29 30 25 17 2 10 1 16 DIF. BETWEEN (MAX.-MIN.) (C) 12.1 9.8 11.6 11.0 10.4 14.8 14.0 13.0 16.3 17.7 12.0 7.1 12.5 MEAN DAILY TEMP. (MDT) (C) -8.4 -5.2 -4.0 5.9 8.6 14.7 19.1 16.4 12.7 8.6 4.2 -1.7 5.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.0 13.7 3.5 0.0 0.0 0.0 0.0 17.3 HEATING DEG. DAYS(BASE 18 0C) 817.4 672.2 682.1 362.6 291.1 101.3 23.8 67.2 158.2 290.2 414.2 611.3 4491.7 DEWPOINT (MEAN C) -12.3 -8.7 -7.3 -0.5 3.1 8.0 9.6 7.6 4.4 -0.4 -1.8 -5.5 -0.3 MIXING RATIO (G/KG) 2.07 2.62 2.95 4.62 6.10 8.40 9.38 8.16 6.57 4.63 4.33 3.26 5.26 VAPOUR PRESSURE (HPA) 2.71 3.41 3.86 6.03 7.96 10.91 12.17 10.64 8.60 6.08 5.68 4.26 6.86 SATURATION DEF. (HPA) 0.93 1.15 1.41 3.61 4.05 7.19 11.07 8.75 7.29 6.01 2.80 1.31 4.63 RELATIVE HUMIDITY (MEAN %) 76 77 77 70 72 66 60 62 63 62 73 78 70 RELATIVE HUMIDITY (MAX. %) 91 90 93 93 94 93 85 83 89 90 94 92 91 RELATIVE HUMIDITY (MIN. %) 55 59 57 45 49 41 41 42 36 32 49 61 47 RELATIVE HUMIDITY (MEAN% 03UTC) 83 84 89 86 86 86 78 76 83 86 86 87 84 RELATIVE HUMIDITY (MEAN% 09UTC) 62 65 61 57 56 48 46 47 40 38 55 67 54 RELATIVE HUMIDITY (MEAN% 15UTC) 77 76 73 58 63 55 51 56 56 49 67 77 63 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 32.9 60.7 28.7 58.9 73.9 46.6 0.0 11.3 2.3 0.8 57.9 23.4 397.4 DAYS WITH PRECIPITATION >=10 0 3 0 0 2 2 0 0 0 0 3 0 10 DAYS WITH PRECIPITATION >= 5 2 3 2 6 6 3 0 1 0 0 4 1 28 DAYS WITH PRECIPITATION >= 1 9 9 9 12 15 8 0 3 2 0 7 8 82 DAYS WITH PRECIPITATION 17 17 13 19 20 11 0 4 3 2 9 12 127 GREATEST DAILY PRECIPITATION 6.0 20.1 6.0 9.0 13.2 14.0 0.0 5.0 1.2 0.4 17.3 8.6 20.1 DAY 24 24 23 7 11 16 ** 10 15 22 25 17 DAY WITH THUNDER STORM 0 1 0 3 5 10 0 2 1 0 0 0 22 DAYS WITH SNOW OR SLEET 19 19 10 9 3 0 0 0 0 0 4 9 73 DAYS WITH DUST 1 0 0 0 0 0 0 0 0 0 0 0 1 WIND DIRECTION (PREVAILING) 270 225 90 270 90 90 90 90 90 270 270 270 90 PREVAILING WIND SPEED(KNOTS) 6.0 9.3 8.0 9.2 7.8 7.8 8.0 7.1 6.4 8.8 7.1 5.6 7.7 PREVAILING WIND PERCENT 9.3 16.4 8.9 12.9 18.5 17.1 36.3 40.7 21.7 14.9 15.8 10.1 14.9 CALMS PERCENT OF WIND 61.7 53.9 71.4 54.6 56.0 59.2 39.1 46.4 59.2 61.7 53.8 64.9 56.8 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 228 230 160 224 126 130 100 89 99 241 233 203 160 VECTOR WIND MAGNITUDE(KNOTS) 1.1 2.7 0.4 1.6 1.1 0.8 3.8 3.3 1.5 0.9 2.4 0.8 0.8 WIND STEADINESES (MEAN %) 35.5 69.2 18.2 38.1 30.6 26.7 86.4 89.2 60.0 29.0 61.5 33.3 24.2 WIND SPEED (MEAN KNOTS) 3.1 3.9 2.2 4.2 3.6 3.0 4.4 3.7 2.5 3.1 3.9 2.4 3.3 FASTEST WIND DIRECTION 210 210 80 240 270 90 90 90 120 270 240 80 240 FASTEST WIND SPEED (KNOTS) 27 29 27 31 23 17 19 16 14 23 27 16 31 DAY 19 7 9 12 18 23 10 4 29 26 21 2 DAYS WITH SKY CLEAR (0-2)/8 11 6 10 1 7 12 19 17 22 19 9 3 136 DAYS WITH P.CLOUDY (3-6)/8 9 10 10 16 7 18 12 12 7 9 17 18 145 DAYS WITH CLOUDY (7-8)/8 11 13 11 13 17 0 0 2 1 3 4 10 85 DAYS WITH VISIBILITY =< 2 KM 4 3 2 2 0 0 0 0 0 0 0 0 11 DURATION OF SUNSHINE HOURS 125.4 121.6 152.8 169.3 185.9 309.6 355.4 308.0 288.2 243.9 163.5 108.8 2532.4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 818.1 815.8 818.9 818.3 820.8 819.0 819.6 822.2 823.1 823.6 822.1 819.1 820.0 MAX. QFE PRESSURE IN HPA 828.5 825.4 828.6 823.0 826.4 824.0 825.4 827.4 827.3 828.8 831.0 825.8 831.0 DAY-HOUR 9-18 15-21 12- 9 19-21 27- 9 10-18 7- 6 30-18 4- 6 15-18 3- 6 2-15 MIN. QFE PRESSURE IN HPA 806.0 807.0 808.0 812.8 812.0 815.0 814.2 817.0 817.0 818.0 810.0 814.0 806.0 DAY-HOUR 30-12 24-12 31- 0 1- 0 9-12 27-12 9-15 1- 0 17-12 26- 9 24-21 14-12 MEAN QNH PRESSURE IN HPA 1016.3 1013.6 1017.2 1016.5 1019.5 1017.4 1018.1 1021.2 1022.2 1022.8 1021.1 1017.5 1018.6 MAX. QNH PRESSURE IN HPA 1028.7 1025.0 1028.8 1022.2 1026.2 1023.4 1025.0 1027.4 1027.3 1029.1 1031.7 1025.5 1031.7 DAY-HOUR 9-18 15-21 12- 9 19-21 27- 9 10-18 7- 6 30-18 4- 6 15-18 3- 6 2-15 MIN. QNH PRESSURE IN HPA 1001.9 1003.1 1004.3 1010.0 1009.0 1012.6 1011.7 1015.0 1015.0 1016.2 1006.7 1011.4 1001.9 DAY-HOUR 30-12 24-12 31- 0 1- 0 9-12 27-12 9-15 1- 0 17-12 26- 9 24-21 14-12 MEAN QFF PRESSURE IN HPA 1026.1 1020.0 1022.8 1014.4 1015.0 1007.8 1005.8 1011.0 1014.6 1018.9 1020.9 1021.5 1016.6 MAX. QFF PRESSURE IN HPA 1047.9 1039.2 1043.8 1024.2 1029.0 1014.0 1017.3 1022.7 1025.0 1029.6 1033.3 1032.9 1047.9 DAY-HOUR 9-18 16- 3 12- 3 8- 0 2- 6 6-18 12- 6 31- 3 30- 3 15-18 4- 3 29- 3 MIN. QFF PRESSURE IN HPA 1010.0 1002.6 1001.8 1004.4 1001.1 1000.6 995.6 1000.2 1006.3 1005.9 1002.0 1008.8 995.6 DAY-HOUR 3- 0 24-12 30-12 22-12 9-12 17-12 31-12 18-15 13-18 11- 0 22-21 14-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 817.8 815.7 818.6 817.8 820.6 819.0 819.5 821.7 822.8 823.5 822.0 819.0 819.8 MAX. QFE PRESSURE IN HPA 828.0 825.4 827.2 822.0 826.2 822.9 824.4 826.2 826.8 828.0 830.6 824.7 830.6 DAY 5 16 12 8 27 11 6 31 29 18 4 1 MIN. QFE PRESSURE IN HPA 806.8 809.2 808.0 812.8 813.0 815.0 816.0 817.0 817.0 819.0 810.0 815.0 806.8 DAY 31 21 31 1 10 28 24 1 25 11 25 15 MEAN QNH PRESSURE IN HPA 1015.9 1013.5 1016.9 1016.0 1019.3 1017.3 1018.0 1020.6 1021.9 1022.7 1021.0 1017.4 1018.4 MAX. QNH PRESSURE IN HPA 1028.1 1025.0 1027.2 1021.0 1026.0 1022.0 1023.8 1026.0 1026.7 1028.1 1031.2 1024.2 1031.2 DAY 5 16 12 8 27 11 6 31 29 18 4 1 MIN. QNH PRESSURE IN HPA 1002.8 1005.7 1004.3 1010.0 1010.2 1012.6 1013.8 1015.0 1015.0 1017.4 1006.7 1012.6 1002.8 DAY 31 21 31 1 10 28 24 1 25 11 25 15 MEAN QFF PRESSURE IN HPA 1024.6 1019.4 1022.3 1013.7 1015.1 1008.1 1005.5 1010.2 1013.9 1018.3 1019.9 1020.8 1016.0 MAX. QFF PRESSURE IN HPA 1041.6 1037.9 1040.7 1024.2 1027.2 1013.0 1015.6 1019.7 1023.9 1026.3 1030.9 1030.8 1041.6 DAY 10 16 12 8 2 11 12 31 29 16 4 29 MIN. QFF PRESSURE IN HPA 1010.0 1005.7 1003.3 1005.4 1003.1 1001.7 996.5 1000.3 1006.7 1005.9 1003.2 1010.8 996.5 DAY 3 21 31 13 9 28 31 1 25 11 25 15 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 817.8 815.9 818.8 818.2 820.7 818.9 819.8 822.1 823.2 823.5 822.0 819.1 820.0 MAX. QFE PRESSURE IN HPA 827.2 824.7 827.4 822.0 826.2 823.3 824.4 826.2 827.0 827.0 830.4 824.8 830.4 DAY 5 16 12 8 27 11 6 31 4 15 4 1 MIN. QFE PRESSURE IN HPA 808.0 810.2 808.6 814.0 813.7 815.1 816.8 817.3 818.0 819.0 810.0 815.0 808.0 DAY 31 8 31 1 10 17 25 1 25 26 25 14 MEAN QNH PRESSURE IN HPA 1015.9 1013.6 1017.2 1016.5 1019.5 1017.2 1018.4 1021.1 1022.4 1022.8 1021.0 1017.5 1018.6 MAX. QNH PRESSURE IN HPA 1027.2 1024.2 1027.4 1021.0 1026.0 1022.5 1023.8 1026.0 1026.9 1026.9 1031.0 1024.3 1031.0 DAY 5 16 12 8 27 11 6 31 4 15 4 1 MIN. QNH PRESSURE IN HPA 1004.3 1006.9 1005.0 1011.4 1011.1 1012.7 1014.8 1015.4 1016.2 1017.4 1006.7 1012.6 1004.3 DAY 31 8 31 1 10 17 25 1 25 26 25 14 MEAN QFF PRESSURE IN HPA 1026.9 1021.1 1024.0 1014.9 1015.5 1008.3 1006.7 1011.7 1016.3 1020.8 1021.8 1022.3 1017.5 MAX. QFF PRESSURE IN HPA 1046.1 1039.2 1043.8 1023.4 1028.4 1013.7 1016.2 1022.7 1025.0 1028.8 1033.3 1032.9 1046.1 DAY 10 16 12 8 2 6 12 31 30 30 4 29 MIN. QFF PRESSURE IN HPA 1012.2 1008.1 1004.9 1008.1 1003.9 1002.2 999.5 1002.5 1009.4 1008.4 1004.2 1011.5 999.5 DAY 31 21 31 22 9 27 31 18 25 11 25 14 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 818.8 816.3 819.5 818.8 821.0 819.1 820.1 822.5 823.5 824.2 822.8 819.8 820.5 MAX. QFE PRESSURE IN HPA 828.0 825.0 828.2 821.8 826.2 823.3 825.4 826.8 827.3 828.0 831.0 825.0 831.0 DAY 5 16 12 8 27 11 7 30 4 15 3 1 MIN. QFE PRESSURE IN HPA 809.0 811.0 809.0 815.0 813.9 815.4 817.0 818.1 819.0 819.0 812.0 816.0 809.0 DAY 30 24 31 18 9 17 10 1 17 26 25 14 MEAN QNH PRESSURE IN HPA 1017.2 1014.2 1018.0 1017.1 1019.8 1017.5 1018.7 1021.6 1022.8 1023.5 1022.0 1018.3 1019.2 MAX. QNH PRESSURE IN HPA 1028.1 1024.5 1028.4 1020.7 1026.0 1022.5 1025.0 1026.7 1027.3 1028.1 1031.7 1024.5 1031.7 DAY 5 16 12 8 27 11 7 30 4 15 3 1 MIN. QNH PRESSURE IN HPA 1005.5 1007.9 1005.5 1012.6 1011.3 1013.1 1015.0 1016.3 1017.4 1017.4 1009.0 1013.8 1005.5 DAY 30 24 31 18 9 17 10 1 17 26 25 14 MEAN QFF PRESSURE IN HPA 1027.9 1020.9 1023.8 1015.0 1015.2 1007.5 1006.4 1011.3 1014.7 1019.4 1022.1 1022.6 1017.2 MAX. QFF PRESSURE IN HPA 1046.9 1038.6 1043.3 1021.3 1029.0 1012.5 1017.3 1019.8 1023.6 1027.9 1031.8 1031.8 1046.9 DAY 9 16 12 8 2 7 12 30 29 15 4 29 MIN. QFF PRESSURE IN HPA 1012.6 1007.5 1004.1 1006.5 1003.5 1000.8 998.1 1004.0 1008.1 1008.6 1006.3 1011.9 998.1 DAY 16 24 31 22 9 28 31 18 25 26 22 14 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 818.3 816.0 819.5 818.5 821.0 819.1 819.8 822.3 823.2 823.5 822.2 819.1 820.2 MAX. QFE PRESSURE IN HPA 827.0 824.4 828.6 822.0 826.4 823.0 825.4 826.8 827.0 828.0 830.0 824.7 830.0 DAY 5 16 12 30 27 11 7 30 29 15 3 2 MIN. QFE PRESSURE IN HPA 808.2 808.6 809.8 815.0 813.2 815.8 816.0 817.8 818.0 818.0 813.0 815.1 808.2 DAY 30 24 31 22 9 27 31 18 17 26 25 30 MEAN QNH PRESSURE IN HPA 1016.6 1013.8 1018.0 1016.8 1019.8 1017.6 1018.4 1021.3 1022.4 1022.8 1021.2 1017.5 1018.8 MAX. QNH PRESSURE IN HPA 1026.9 1023.8 1028.8 1021.0 1026.2 1022.2 1025.0 1026.7 1026.9 1028.1 1030.5 1024.2 1030.5 DAY 5 16 12 30 27 11 7 30 29 15 3 2 MIN. QNH PRESSURE IN HPA 1004.5 1005.0 1006.4 1012.6 1010.5 1013.6 1013.8 1016.0 1016.2 1016.2 1010.2 1012.7 1004.5 DAY 30 24 31 22 9 27 31 18 17 26 25 30 MEAN QFF PRESSURE IN HPA 1025.3 1019.2 1022.9 1014.2 1015.0 1007.5 1005.6 1010.6 1014.0 1017.8 1020.1 1020.8 1016.1 MAX. QFF PRESSURE IN HPA 1041.1 1035.5 1041.4 1021.7 1029.0 1012.8 1016.4 1019.7 1023.1 1027.3 1028.9 1028.2 1041.4 DAY 9 16 12 19 2 2 12 30 30 15 4 29 MIN. QFF PRESSURE IN HPA 1011.4 1004.3 1003.4 1006.0 1002.5 1001.6 995.8 1001.5 1006.9 1007.4 1006.1 1010.4 995.8 DAY 16 24 30 22 9 27 31 18 17 26 22 14 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 817.7 815.3 818.6 817.9 820.5 818.5 818.9 821.7 822.6 822.9 821.6 818.5 819.5 MAX. QFE PRESSURE IN HPA 826.6 823.3 827.4 821.4 825.8 822.2 824.2 826.0 826.8 828.0 828.8 824.6 828.8 DAY 9 15 12 19 27 10 7 12 29 15 3 2 MIN. QFE PRESSURE IN HPA 806.0 807.0 808.7 814.0 812.0 815.0 814.8 818.0 817.0 819.0 812.9 814.0 806.0 DAY 30 24 30 22 9 27 9 1 17 10 25 14 MEAN QNH PRESSURE IN HPA 1015.8 1012.9 1016.9 1016.0 1019.2 1016.8 1017.3 1020.6 1021.6 1022.0 1020.5 1016.8 1018.0 MAX. QNH PRESSURE IN HPA 1026.5 1022.5 1027.4 1020.3 1025.5 1021.2 1023.6 1025.7 1026.7 1028.1 1029.1 1024.1 1029.1 DAY 9 15 12 19 27 10 7 12 29 15 3 2 MIN. QNH PRESSURE IN HPA 1001.9 1003.1 1005.1 1011.4 1009.0 1012.6 1012.4 1016.2 1015.0 1017.4 1010.1 1011.4 1001.9 DAY 30 24 30 22 9 27 9 1 17 10 25 14 MEAN QFF PRESSURE IN HPA 1024.5 1018.8 1022.0 1013.7 1014.8 1007.3 1004.6 1010.3 1013.8 1017.5 1019.5 1020.3 1015.6 MAX. QFF PRESSURE IN HPA 1040.7 1033.0 1039.8 1021.5 1028.1 1012.6 1015.0 1018.0 1023.0 1028.0 1027.4 1028.4 1040.7 DAY 9 16 12 7 2 10 12 11 29 15 2 2 MIN. QFF PRESSURE IN HPA 1010.1 1002.6 1001.8 1004.4 1001.1 1000.6 995.6 1001.8 1006.4 1007.7 1005.4 1008.8 995.6 DAY 16 24 30 22 9 17 31 18 17 11 22 14 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 818.2 815.6 818.6 817.8 820.5 818.5 818.9 821.8 822.7 823.4 822.1 819.1 819.8 MAX. QFE PRESSURE IN HPA 827.0 824.1 827.0 822.1 825.3 822.2 824.0 826.4 827.0 828.0 830.0 825.8 830.0 DAY 4 15 12 30 2 10 7 30 29 15 3 2 MIN. QFE PRESSURE IN HPA 806.6 808.6 808.1 813.0 813.3 815.0 814.2 817.3 817.0 819.0 813.4 814.7 806.6 DAY 30 24 30 14 9 27 9 18 17 10 22 30 MEAN QNH PRESSURE IN HPA 1016.4 1013.3 1016.9 1016.0 1019.1 1016.9 1017.2 1020.8 1021.8 1022.7 1021.0 1017.5 1018.3 MAX. QNH PRESSURE IN HPA 1026.9 1023.5 1026.9 1021.1 1024.9 1021.2 1023.4 1026.2 1026.9 1028.1 1030.5 1025.5 1030.5 DAY 4 15 12 30 2 10 7 30 29 15 3 2 MIN. QNH PRESSURE IN HPA 1002.6 1005.0 1004.4 1010.2 1010.6 1012.6 1011.7 1015.4 1015.0 1017.4 1010.7 1012.3 1002.6 DAY 30 24 30 14 9 27 9 18 17 10 22 30 MEAN QFF PRESSURE IN HPA 1027.3 1020.7 1023.4 1014.4 1015.0 1007.7 1005.5 1011.3 1015.6 1020.5 1021.9 1022.4 1017.2 MAX. QFF PRESSURE IN HPA 1046.3 1037.4 1042.7 1021.9 1028.3 1013.8 1016.9 1019.9 1024.9 1028.6 1031.7 1031.5 1046.3 DAY 9 16 12 7 2 6 12 30 29 15 4 1 MIN. QFF PRESSURE IN HPA 1010.2 1005.6 1002.4 1005.4 1003.7 1001.1 997.1 1000.2 1007.0 1010.6 1005.9 1011.5 997.1 DAY 16 24 30 14 9 17 24 18 24 11 22 14 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 818.3 815.8 818.9 818.7 821.2 819.7 819.9 822.8 823.5 823.9 822.4 819.4 820.4 MAX. QFE PRESSURE IN HPA 828.5 824.1 827.0 823.0 826.0 824.0 825.0 827.4 827.0 828.8 830.3 825.0 830.3 DAY 9 15 12 30 27 10 7 30 2 15 3 2 MIN. QFE PRESSURE IN HPA 806.2 809.0 809.0 814.0 815.0 816.0 815.1 817.8 819.2 819.0 812.8 815.0 806.2 DAY 30 7 30 14 8 27 20 18 17 10 22 14 MEAN QNH PRESSURE IN HPA 1016.6 1013.6 1017.3 1017.0 1020.1 1018.2 1018.5 1021.9 1022.7 1023.2 1021.5 1017.8 1019.0 MAX. QNH PRESSURE IN HPA 1028.7 1023.5 1026.9 1022.2 1025.7 1023.4 1024.5 1027.4 1026.9 1029.1 1030.9 1024.5 1030.9 DAY 9 15 12 30 27 10 7 30 2 15 3 2 MIN. QNH PRESSURE IN HPA 1002.1 1005.5 1005.5 1011.4 1012.6 1013.8 1012.7 1016.0 1017.6 1017.4 1010.0 1012.6 1002.1 DAY 30 7 30 14 8 27 20 18 17 10 22 14 MEAN QFF PRESSURE IN HPA 1027.3 1020.4 1022.8 1014.9 1015.3 1008.1 1006.2 1011.8 1014.7 1019.1 1021.8 1022.1 1017.0 MAX. QFF PRESSURE IN HPA 1047.9 1035.4 1041.4 1023.7 1028.9 1014.0 1017.3 1021.0 1024.0 1029.6 1030.9 1031.6 1047.9 DAY 9 16 12 7 2 6 11 30 29 15 17 28 MIN. QFF PRESSURE IN HPA 1010.2 1007.5 1003.5 1006.2 1006.3 1001.0 997.7 1003.0 1006.3 1006.9 1004.9 1010.8 997.7 DAY 16 24 30 14 8 27 23 18 13 10 22 14 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 818.2 816.0 818.6 818.6 820.9 819.4 819.9 822.6 823.2 823.8 822.1 819.0 820.2 MAX. QFE PRESSURE IN HPA 827.6 825.4 826.8 823.0 826.2 823.8 824.4 827.4 827.0 827.8 830.6 824.8 830.6 DAY 4 15 11 19 26 10 5 30 28 15 3 10 MIN. QFE PRESSURE IN HPA 806.8 810.0 808.3 814.0 814.3 815.4 816.0 817.8 819.0 819.0 810.0 815.0 806.8 DAY 30 24 30 14 8 27 9 18 24 10 24 13 MEAN QNH PRESSURE IN HPA 1016.5 1013.8 1017.0 1016.9 1019.7 1017.9 1018.4 1021.7 1022.4 1023.1 1021.1 1017.4 1018.8 MAX. QNH PRESSURE IN HPA 1027.6 1025.0 1026.7 1022.2 1026.0 1023.1 1023.8 1027.4 1026.9 1027.9 1031.2 1024.3 1031.2 DAY 4 15 11 19 26 10 5 30 28 15 3 10 MIN. QNH PRESSURE IN HPA 1002.8 1006.7 1004.6 1011.4 1011.8 1013.1 1013.8 1016.0 1017.4 1017.4 1006.7 1012.6 1002.8 DAY 30 24 30 14 8 27 9 18 24 10 24 13 MEAN QFF PRESSURE IN HPA 1025.2 1019.5 1021.6 1014.4 1014.7 1007.8 1005.8 1011.2 1014.0 1018.2 1020.1 1020.8 1016.1 MAX. QFF PRESSURE IN HPA 1041.0 1037.3 1039.4 1023.9 1027.6 1012.7 1016.7 1021.1 1023.6 1027.5 1031.3 1031.0 1041.0 DAY 9 15 11 19 1 10 11 30 29 15 3 28 MIN. QFF PRESSURE IN HPA 1010.6 1006.5 1003.1 1006.3 1004.5 1000.6 996.2 1002.2 1006.7 1005.9 1002.0 1010.7 996.2 DAY 30 20 30 14 8 27 23 18 17 10 22 14 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -6.7 -4.2 -0.4 7.8 11.3 15.5 18.3 18.2 14.9 7.1 -1.0 -2.2 6.6 MINIMUN AIR TEMPERATURE (C) -12.1 -9.0 -5.5 2.0 4.9 7.1 11.8 11.3 6.4 -0.4 -4.5 -7.1 0.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 28 24 22 2 0 0 0 0 0 6 15 18 115 DAYS WITH FREEZING MIN.<= 0 31 27 29 11 4 0 0 0 1 19 24 29 175 TEMPERATURE RECORDS LOWEST(C) -25.0 -21.0 -18.5 -5.0 -1.5 0.5 6.6 6.4 0.0 -7.6 -18.5 -19.6 -25.0 DAY 20 17 13 5 9 23 13 13 28 8 15 6 MAXIMUM AIR TEMPERATURE (C) -1.4 0.5 5.1 13.7 17.3 22.8 25.0 25.4 24.3 15.7 3.3 2.9 12.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 1 5 3 2 0 0 0 11 DAYS WITH MAXIMUM TEMP. <= 0 22 11 5 0 0 0 0 0 0 0 9 7 54 TEMPERATURE RECORDS HIGHEST(C) 4.6 7.8 16.8 24.2 22.4 30.0 31.4 31.0 31.0 24.2 13.8 7.2 31.4 DAY 29 27 31 19 19 27 24 14 1 1 8 24 DIF. BETWEEN (MAX.-MIN.) (C) 10.7 9.5 10.6 11.7 12.4 15.7 13.2 14.1 17.9 16.1 7.8 10.0 12.5 MEAN DAILY TEMP. (MDT) (C) -6.7 -4.2 -0.2 7.9 11.1 15.0 18.4 18.4 15.3 7.7 -0.6 -2.1 6.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.0 8.4 3.7 1.0 0.0 0.0 0.0 13.1 HEATING DEG. DAYS(BASE 18 0C) 767.0 622.9 564.0 303.8 214.3 95.8 28.6 19.0 88.4 320.7 558.6 622.3 4205.5 DEWPOINT (MEAN C) -10.2 -7.0 -4.9 -0.7 4.5 6.3 8.3 7.7 5.1 0.2 -4.0 -4.9 0.0 MIXING RATIO (G/KG) 2.35 2.95 3.37 4.61 6.59 7.47 8.59 8.30 6.98 4.83 3.66 3.41 5.26 VAPOUR PRESSURE (HPA) 3.08 3.86 4.40 6.01 8.59 9.73 11.17 10.82 9.11 6.37 4.80 4.48 6.87 SATURATION DEF. (HPA) 0.97 0.92 1.97 5.25 5.50 9.08 10.85 11.25 9.45 4.61 1.25 1.05 5.18 RELATIVE HUMIDITY (MEAN %) 77 82 75 61 67 60 56 55 59 68 82 83 69 RELATIVE HUMIDITY (MAX. %) 91 94 94 85 92 89 78 84 90 95 94 94 90 RELATIVE HUMIDITY (MIN. %) 61 65 54 39 45 37 37 34 30 37 65 65 47 RELATIVE HUMIDITY (MEAN% 03UTC) 82 89 91 77 87 79 70 74 87 93 88 90 84 RELATIVE HUMIDITY (MEAN% 09UTC) 69 71 60 46 49 42 42 39 36 42 73 71 53 RELATIVE HUMIDITY (MEAN% 15UTC) 75 78 67 51 57 47 49 52 47 60 82 82 62 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 20.9 17.1 79.3 51.9 64.9 34.3 4.5 10.6 0.0 32.1 98.1 20.4 434.1 DAYS WITH PRECIPITATION >=10 0 0 3 1 2 1 0 0 0 2 2 0 11 DAYS WITH PRECIPITATION >= 5 1 2 5 3 6 1 0 1 0 3 8 1 31 DAYS WITH PRECIPITATION >= 1 5 5 10 11 11 4 1 3 0 3 14 5 72 DAYS WITH PRECIPITATION 12 13 15 17 15 6 3 4 0 4 15 10 114 GREATEST DAILY PRECIPITATION 6.5 5.0 21.7 18.0 12.2 24.0 4.0 5.5 0.0 12.0 26.0 8.2 26.0 DAY 8 2 8 26 7 1 11 28 ** 28 1 8 DAY WITH THUNDER STORM 0 0 2 1 7 3 4 2 0 0 0 0 19 DAYS WITH SNOW OR SLEET 11 14 14 3 0 0 0 0 0 1 13 9 65 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 270 90 270 270 270 90 90 90 90 90 90 270 90 PREVAILING WIND SPEED(KNOTS) 7.1 9.6 9.1 8.2 6.7 8.0 8.1 7.7 9.3 8.2 9.7 4.6 8.4 PREVAILING WIND PERCENT 12.9 14.3 13.7 23.3 21.0 17.1 43.5 32.3 28.3 23.0 22.5 11.3 18.3 CALMS PERCENT OF WIND 56.5 53.6 60.5 47.5 45.6 51.7 31.9 37.5 52.9 59.7 52.5 72.6 51.8 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 204 128 228 247 235 107 101 105 98 90 99 290 118 VECTOR WIND MAGNITUDE(KNOTS) 0.5 1.4 1.2 2.7 1.0 1.9 4.6 3.1 2.7 1.8 2.3 0.8 1.1 WIND STEADINESES (MEAN %) 13.5 38.9 38.7 67.5 28.6 57.6 90.2 72.1 71.1 60.0 60.5 61.5 31.4 WIND SPEED (MEAN KNOTS) 3.7 3.6 3.1 4.0 3.5 3.3 5.1 4.3 3.8 3.0 3.8 1.3 3.5 FASTEST WIND DIRECTION 90 110 250 260 260 120 120 40 70 280 90 240 250 FASTEST WIND SPEED (KNOTS) 23 23 39 23 23 19 23 23 23 35 29 8 39 DAY 5 15 23 19 15 9 11 28 23 11 11 5 DAYS WITH SKY CLEAR (0-2)/8 8 8 10 3 4 21 21 20 25 17 1 5 143 DAYS WITH P.CLOUDY (3-6)/8 14 9 11 15 17 6 10 11 5 12 11 15 136 DAYS WITH CLOUDY (7-8)/8 9 11 10 12 10 3 0 0 0 2 18 11 86 DAYS WITH VISIBILITY =< 2 KM 1 1 1 1 2 0 0 0 0 0 3 5 14 DURATION OF SUNSHINE HOURS 130.1 127.4 175.6 166.4 249.5 326.4 361.5 332.6 309.8 245.6 83.4 98.5 2606.8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 819.6 819.0 818.3 818.3 820.1 819.7 820.8 821.7 821.9 826.4 822.0 823.3 820.9 MAX. QFE PRESSURE IN HPA 829.4 827.6 827.2 825.0 826.0 829.3 826.4 828.8 827.9 832.4 829.6 829.8 832.4 DAY-HOUR 6- 6 9- 6 31- 6 1- 0 8-18 22- 9 27- 6 28-15 22- 6 19-18 21- 6 26-15 MIN. QFE PRESSURE IN HPA 806.9 811.9 807.8 811.9 815.0 814.0 814.6 815.4 816.7 817.4 810.7 815.0 806.9 DAY-HOUR 8- 9 21- 0 3-12 22-15 6- 6 3-12 2-15 11-15 7-12 28-12 11- 0 5- 9 MEAN QNH PRESSURE IN HPA 1018.1 1017.4 1016.6 1016.6 1018.7 1018.2 1019.5 1020.6 1020.9 1026.2 1020.9 1022.5 1019.7 MAX. QNH PRESSURE IN HPA 1029.8 1027.6 1027.2 1024.5 1025.7 1029.7 1026.2 1029.1 1028.0 1033.4 1030.0 1030.3 1033.4 DAY-HOUR 6- 6 9- 6 31- 6 1- 0 8-18 22- 9 27- 6 28-15 22- 6 19-18 21- 6 26-15 MIN. QNH PRESSURE IN HPA 1003.0 1008.9 1004.0 1008.9 1012.6 1011.4 1012.1 1013.1 1014.7 1015.5 1007.5 1012.6 1003.0 DAY-HOUR 8- 9 21- 0 3-12 22-15 6- 6 3-12 2-15 11-15 7-12 28-12 11- 0 5- 9 MEAN QFF PRESSURE IN HPA 1026.3 1023.4 1019.4 1012.8 1012.1 1008.6 1007.7 1009.0 1011.6 1023.2 1024.3 1027.0 1017.1 MAX. QFF PRESSURE IN HPA 1042.8 1036.1 1035.3 1023.5 1026.1 1024.7 1014.6 1019.6 1024.0 1033.1 1038.6 1041.5 1042.8 DAY-HOUR 20- 3 10- 0 23- 3 1- 3 8-21 22- 3 27- 3 28-15 22- 3 8- 3 30- 6 6-15 MIN. QFF PRESSURE IN HPA 1004.6 1009.1 1002.5 998.2 1003.9 1001.2 997.8 998.7 1001.8 1010.7 1003.5 1016.5 997.8 DAY-HOUR 8- 9 21- 0 8- 0 20- 9 17- 9 30-15 2-15 10-12 1-12 2- 0 10-12 5-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 819.5 818.9 818.1 818.5 819.8 819.6 820.7 821.7 822.2 826.3 821.7 823.1 820.8 MAX. QFE PRESSURE IN HPA 828.3 826.3 826.3 825.0 824.5 827.7 825.1 824.8 827.1 831.6 829.0 829.4 831.6 DAY 6 10 31 1 9 22 27 30 22 20 21 27 MIN. QFE PRESSURE IN HPA 807.7 811.9 808.2 814.4 815.6 814.6 816.7 816.5 818.0 819.7 810.7 815.4 807.7 DAY 9 21 8 22 13 3 3 12 29 28 11 5 MEAN QNH PRESSURE IN HPA 1018.0 1017.3 1016.3 1016.8 1018.4 1018.1 1019.4 1020.6 1021.2 1026.1 1020.6 1022.3 1019.6 MAX. QNH PRESSURE IN HPA 1028.5 1026.1 1026.1 1024.5 1024.0 1027.8 1024.7 1024.3 1027.1 1032.4 1029.3 1029.8 1032.4 DAY 6 10 31 1 9 22 27 30 22 20 21 27 MIN. QNH PRESSURE IN HPA 1003.9 1008.9 1004.5 1011.9 1013.3 1012.1 1014.7 1014.4 1016.2 1018.2 1007.5 1013.1 1003.9 DAY 9 21 8 22 13 3 3 12 29 28 11 5 MEAN QFF PRESSURE IN HPA 1025.4 1023.1 1018.8 1012.9 1012.1 1008.8 1007.4 1008.7 1011.3 1022.5 1023.5 1026.4 1016.8 MAX. QFF PRESSURE IN HPA 1037.9 1036.1 1032.9 1021.6 1023.8 1022.9 1012.9 1015.2 1021.6 1029.6 1033.9 1033.7 1037.9 DAY 20 10 23 1 9 22 20 25 22 8 30 7 MIN. QFF PRESSURE IN HPA 1006.1 1009.1 1002.5 1001.3 1006.1 1002.2 1000.1 1001.1 1003.9 1010.7 1005.3 1016.7 1000.1 DAY 9 21 8 20 17 3 25 10 2 2 11 5 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 819.5 818.9 818.4 818.5 820.1 820.0 821.1 822.1 822.4 826.6 822.0 823.0 821.1 MAX. QFE PRESSURE IN HPA 828.7 826.2 827.0 825.0 825.0 828.9 825.8 824.7 827.6 831.6 829.0 828.0 831.6 DAY 6 9 31 1 9 22 27 24 22 20 21 26 MIN. QFE PRESSURE IN HPA 807.7 812.4 810.4 814.4 815.6 814.6 817.2 817.1 817.9 819.0 813.0 815.4 807.7 DAY 8 21 8 8 6 3 1 12 29 28 11 5 MEAN QNH PRESSURE IN HPA 1018.0 1017.3 1016.6 1016.9 1018.7 1018.6 1019.9 1021.1 1021.4 1026.4 1021.0 1022.2 1019.8 MAX. QNH PRESSURE IN HPA 1029.0 1026.0 1026.9 1024.5 1024.5 1029.2 1025.5 1024.2 1027.6 1032.4 1029.3 1028.1 1032.4 DAY 6 9 31 1 9 22 27 24 22 20 21 26 MIN. QNH PRESSURE IN HPA 1003.9 1009.5 1007.1 1011.9 1013.3 1012.1 1015.2 1015.1 1016.1 1017.4 1010.2 1013.1 1003.9 DAY 8 21 8 8 6 3 1 12 29 28 11 5 MEAN QFF PRESSURE IN HPA 1027.1 1023.9 1020.4 1013.9 1012.8 1009.4 1008.7 1010.6 1013.6 1025.1 1024.8 1027.6 1018.2 MAX. QFF PRESSURE IN HPA 1042.8 1035.6 1035.3 1023.5 1025.4 1024.7 1014.6 1017.0 1024.0 1033.1 1036.7 1036.7 1042.8 DAY 20 10 23 1 9 22 27 29 22 8 30 6 MIN. QFF PRESSURE IN HPA 1007.6 1009.9 1007.7 1001.6 1007.2 1002.8 1002.1 1001.5 1006.7 1011.6 1007.4 1017.6 1001.5 DAY 9 21 8 20 20 3 25 10 2 2 10 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 820.2 819.7 819.0 818.8 820.4 820.2 821.2 822.3 822.6 827.3 822.8 823.8 821.5 MAX. QFE PRESSURE IN HPA 829.4 827.6 827.2 825.0 825.5 829.2 826.4 825.3 827.9 832.1 829.6 829.6 832.1 DAY 6 9 31 1 9 22 27 24 22 18 21 26 MIN. QFE PRESSURE IN HPA 808.4 813.7 811.8 814.0 815.0 814.9 817.4 817.3 818.2 818.9 813.8 815.9 808.4 DAY 8 21 8 8 6 3 1 12 29 28 10 5 MEAN QNH PRESSURE IN HPA 1018.9 1018.2 1017.4 1017.2 1019.1 1018.8 1020.1 1021.4 1021.7 1027.3 1021.9 1023.2 1020.4 MAX. QNH PRESSURE IN HPA 1029.8 1027.6 1027.2 1024.5 1025.1 1029.6 1026.2 1024.9 1028.0 1033.0 1030.0 1030.0 1033.0 DAY 6 9 31 1 9 22 27 24 22 18 21 26 MIN. QNH PRESSURE IN HPA 1004.8 1011.1 1008.8 1011.4 1012.6 1012.5 1015.5 1015.4 1016.4 1017.3 1011.2 1013.7 1004.8 DAY 8 21 8 8 6 3 1 12 29 28 10 5 MEAN QFF PRESSURE IN HPA 1027.9 1024.6 1020.3 1013.3 1012.1 1008.9 1008.3 1009.6 1012.4 1024.0 1025.6 1028.1 1017.9 MAX. QFF PRESSURE IN HPA 1041.5 1034.7 1034.9 1022.8 1023.6 1024.0 1014.4 1015.8 1023.7 1030.3 1038.6 1037.5 1041.5 DAY 20 16 23 23 9 22 27 24 22 20 30 6 MIN. QFF PRESSURE IN HPA 1009.4 1011.1 1008.0 1000.7 1005.0 1003.2 1000.9 1001.8 1005.5 1011.7 1006.2 1020.1 1000.7 DAY 8 21 8 20 17 16 1 10 7 28 10 4 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 819.6 819.2 818.7 818.3 820.2 819.9 820.8 821.8 821.9 826.3 822.1 823.2 821.0 MAX. QFE PRESSURE IN HPA 828.4 827.3 826.5 824.2 825.3 829.3 825.4 825.2 827.4 830.7 828.8 829.0 830.7 DAY 6 9 31 1 8 22 27 28 22 17 21 26 MIN. QFE PRESSURE IN HPA 806.9 813.5 810.4 812.3 815.5 814.5 816.7 816.8 817.9 818.0 812.6 815.0 806.9 DAY 8 21 3 8 6 3 1 12 3 28 10 5 MEAN QNH PRESSURE IN HPA 1018.1 1017.6 1017.0 1016.6 1018.9 1018.5 1019.6 1020.7 1020.8 1026.1 1021.1 1022.4 1019.8 MAX. QNH PRESSURE IN HPA 1028.6 1027.3 1026.3 1023.6 1024.9 1029.7 1025.0 1024.8 1027.4 1031.3 1029.1 1029.3 1031.3 DAY 6 9 31 1 8 22 27 28 22 17 21 26 MIN. QNH PRESSURE IN HPA 1003.0 1010.8 1007.1 1009.4 1013.2 1012.0 1014.7 1014.8 1016.1 1016.2 1009.8 1012.6 1003.0 DAY 8 21 3 8 6 3 1 12 3 28 10 5 MEAN QFF PRESSURE IN HPA 1025.5 1023.0 1019.4 1012.4 1011.9 1008.7 1007.4 1008.5 1010.7 1022.2 1023.9 1026.2 1016.7 MAX. QFF PRESSURE IN HPA 1036.9 1033.3 1031.8 1020.7 1023.8 1023.7 1012.9 1014.5 1022.3 1027.5 1035.0 1035.3 1036.9 DAY 6 9 23 23 8 22 27 24 22 7 30 20 MIN. QFF PRESSURE IN HPA 1004.6 1011.0 1007.7 998.2 1003.9 1002.9 1000.7 1000.2 1002.7 1010.7 1005.0 1018.8 998.2 DAY 8 21 3 20 17 27 1 14 1 28 10 5 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 818.9 818.3 817.7 817.6 819.8 819.3 819.9 820.8 820.8 825.5 821.5 822.6 820.2 MAX. QFE PRESSURE IN HPA 827.8 826.9 826.0 823.0 825.5 828.6 824.3 824.4 826.5 830.2 828.1 829.0 830.2 DAY 6 9 30 17 8 22 27 28 22 17 21 26 MIN. QFE PRESSURE IN HPA 806.9 813.1 807.8 812.5 815.1 814.0 815.6 815.8 816.7 817.4 812.0 815.8 806.9 DAY 8 20 3 22 6 3 2 12 7 28 10 5 MEAN QNH PRESSURE IN HPA 1017.2 1016.6 1015.8 1015.7 1018.4 1017.7 1018.5 1019.6 1019.6 1025.1 1020.3 1021.7 1018.9 MAX. QNH PRESSURE IN HPA 1027.9 1026.8 1025.7 1022.2 1025.1 1028.8 1023.7 1023.8 1026.3 1030.7 1028.2 1029.3 1030.7 DAY 6 9 30 17 8 22 27 28 22 17 21 26 MIN. QNH PRESSURE IN HPA 1003.0 1010.4 1004.0 1009.6 1012.7 1011.4 1013.3 1013.6 1014.7 1015.5 1009.0 1013.6 1003.0 DAY 8 20 3 22 6 3 2 12 7 28 10 5 MEAN QFF PRESSURE IN HPA 1024.5 1022.2 1018.1 1011.7 1012.0 1008.2 1006.5 1007.6 1009.8 1021.6 1023.3 1025.6 1015.9 MAX. QFF PRESSURE IN HPA 1036.4 1033.3 1030.5 1018.3 1023.1 1022.3 1011.5 1014.2 1021.7 1027.9 1033.3 1034.9 1036.4 DAY 20 9 23 23 8 22 21 17 22 19 30 6 MIN. QFF PRESSURE IN HPA 1005.3 1011.4 1004.0 1002.0 1004.1 1002.6 999.3 998.7 1001.8 1011.5 1003.5 1016.5 998.7 DAY 8 21 3 20 17 9 2 10 1 1 10 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 819.5 818.7 817.8 817.6 819.6 819.0 820.0 821.0 820.9 825.8 821.8 823.3 820.4 MAX. QFE PRESSURE IN HPA 827.6 827.2 825.9 823.0 825.4 827.9 824.1 828.8 826.4 831.2 828.3 829.8 831.2 DAY 6 9 30 17 8 22 27 28 15 17 21 26 MIN. QFE PRESSURE IN HPA 807.7 813.1 808.9 811.9 815.0 814.3 814.6 815.4 816.7 817.7 812.0 817.4 807.7 DAY 8 20 21 22 6 3 2 11 7 28 10 4 MEAN QNH PRESSURE IN HPA 1018.0 1017.1 1016.0 1015.7 1018.1 1017.4 1018.6 1019.8 1019.7 1025.5 1020.7 1022.5 1019.1 MAX. QNH PRESSURE IN HPA 1027.6 1027.2 1025.6 1022.2 1025.0 1028.0 1023.5 1029.1 1026.2 1031.9 1028.5 1030.3 1031.9 DAY 6 9 30 17 8 22 27 28 15 17 21 26 MIN. QNH PRESSURE IN HPA 1003.9 1010.4 1005.4 1008.9 1012.6 1011.8 1012.1 1013.1 1014.7 1015.8 1009.0 1015.5 1003.9 DAY 8 20 21 22 6 3 2 11 7 28 10 4 MEAN QFF PRESSURE IN HPA 1027.0 1023.5 1019.5 1012.8 1012.1 1007.9 1007.3 1009.0 1011.8 1024.2 1024.6 1027.8 1017.3 MAX. QFF PRESSURE IN HPA 1041.2 1034.1 1031.1 1019.4 1024.0 1020.8 1012.3 1019.6 1022.8 1032.1 1034.7 1041.5 1041.5 DAY 20 9 23 4 8 22 27 28 22 19 29 6 MIN. QFF PRESSURE IN HPA 1007.0 1012.7 1007.1 1001.6 1006.3 1001.2 997.8 1000.0 1003.2 1013.1 1004.5 1020.2 997.8 DAY 8 20 21 20 17 30 2 10 1 28 10 28 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 819.9 819.3 818.6 818.7 820.4 819.9 821.2 822.0 822.2 826.7 822.1 823.7 821.2 MAX. QFE PRESSURE IN HPA 826.6 827.0 826.7 824.2 826.0 827.9 825.4 825.5 827.4 832.4 829.2 829.8 832.4 DAY 5 9 30 17 8 22 26 28 15 19 20 26 MIN. QFE PRESSURE IN HPA 807.9 813.1 808.5 814.7 816.7 814.9 816.6 816.5 818.3 819.5 812.3 817.6 807.9 DAY 8 2 21 21 6 3 2 11 28 28 10 4 MEAN QNH PRESSURE IN HPA 1018.5 1017.8 1016.9 1017.1 1019.0 1018.4 1020.1 1021.0 1021.2 1026.6 1021.1 1023.0 1020.0 MAX. QNH PRESSURE IN HPA 1026.5 1026.9 1026.6 1023.6 1025.7 1028.0 1025.0 1025.1 1027.4 1033.4 1029.6 1030.3 1033.4 DAY 5 9 30 17 8 22 26 28 15 19 20 26 MIN. QNH PRESSURE IN HPA 1004.2 1010.4 1004.9 1012.3 1014.7 1012.5 1014.5 1014.4 1016.6 1018.0 1009.4 1015.7 1004.2 DAY 8 2 21 21 6 3 2 11 28 28 10 4 MEAN QFF PRESSURE IN HPA 1027.5 1024.1 1019.7 1013.1 1012.1 1008.3 1008.3 1009.0 1012.1 1023.3 1024.9 1027.8 1017.5 MAX. QFF PRESSURE IN HPA 1042.1 1034.9 1029.4 1021.3 1025.0 1022.4 1014.0 1016.0 1022.3 1029.4 1037.6 1039.8 1042.1 DAY 19 9 16 23 8 21 4 17 22 19 29 6 MIN. QFF PRESSURE IN HPA 1007.8 1011.6 1005.1 1004.2 1005.5 1002.3 1001.0 999.9 1004.3 1011.3 1005.1 1020.8 999.9 DAY 8 2 5 19 19 18 24 13 1 1 10 28 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 819.6 819.2 818.6 818.7 820.2 819.8 821.2 822.0 822.4 826.7 822.0 823.5 821.1 MAX. QFE PRESSURE IN HPA 827.4 826.6 826.6 824.2 826.0 827.6 825.4 825.1 827.4 832.0 829.4 829.5 832.0 DAY 5 9 30 17 8 21 26 28 21 19 20 26 MIN. QFE PRESSURE IN HPA 807.9 812.7 809.1 814.8 816.2 814.7 816.8 816.6 818.2 820.8 812.0 816.4 807.9 DAY 8 20 21 8 12 3 2 11 28 28 10 4 MEAN QNH PRESSURE IN HPA 1018.2 1017.7 1016.9 1017.0 1018.8 1018.4 1020.0 1020.9 1021.4 1026.5 1021.0 1022.7 1020.0 MAX. QNH PRESSURE IN HPA 1027.4 1026.5 1026.5 1023.6 1025.7 1027.6 1025.0 1024.7 1027.4 1032.9 1029.8 1029.9 1032.9 DAY 5 9 30 17 8 21 26 28 21 19 20 26 MIN. QNH PRESSURE IN HPA 1004.2 1009.9 1005.6 1012.4 1014.1 1012.3 1014.8 1014.5 1016.4 1019.5 1009.0 1014.3 1004.2 DAY 8 20 21 8 12 3 2 11 28 28 10 4 MEAN QFF PRESSURE IN HPA 1025.6 1023.1 1019.2 1012.7 1011.8 1008.5 1008.0 1008.7 1011.5 1022.6 1024.1 1026.5 1016.9 MAX. QFF PRESSURE IN HPA 1038.3 1035.3 1031.0 1021.0 1026.1 1023.6 1013.7 1015.3 1021.1 1028.8 1034.4 1036.2 1038.3 DAY 19 9 22 23 8 21 4 24 22 7 29 6 MIN. QFF PRESSURE IN HPA 1006.7 1010.0 1004.7 1002.8 1006.0 1002.4 1000.0 1000.0 1003.1 1011.9 1006.0 1020.3 1000.0 DAY 8 2 7 19 12 30 24 13 1 1 10 28 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -1.8 -4.0 2.8 9.4 11.6 14.6 17.6 18.1 12.9 8.6 4.1 -4.0 7.5 MINIMUN AIR TEMPERATURE (C) -6.4 -8.2 -1.9 2.3 3.8 7.9 12.0 12.5 5.0 1.8 -0.1 -8.6 1.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 24 22 6 1 0 0 0 0 0 3 4 18 78 DAYS WITH FREEZING MIN.<= 0 29 26 25 11 2 0 0 0 7 9 13 28 150 TEMPERATURE RECORDS LOWEST(C) -18.2 -24.5 -8.4 -5.8 -1.0 1.0 4.4 6.2 -2.0 -5.5 -7.5 -25.0 -25.0 DAY 24 19 3 5 19 6 1 26 21 9 10 7 MAXIMUM AIR TEMPERATURE (C) 2.8 1.0 8.2 16.3 18.4 21.1 23.8 24.4 20.8 15.9 9.0 1.3 13.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 0 4 3 0 0 0 0 7 DAYS WITH MAXIMUM TEMP. <= 0 3 8 0 0 0 0 0 0 0 0 0 12 23 TEMPERATURE RECORDS HIGHEST(C) 7.8 7.4 15.6 22.6 25.4 28.4 34.0 31.0 27.8 20.6 15.4 7.8 34.0 DAY 2 27 31 21 31 10 29 18 12 14 3 2 DIF. BETWEEN (MAX.-MIN.) (C) 9.2 9.2 10.1 14.0 14.6 13.2 11.8 11.9 15.8 14.1 9.1 9.9 11.9 MEAN DAILY TEMP. (MDT) (C) -1.8 -3.6 3.1 9.3 11.1 14.5 17.9 18.5 12.9 8.9 4.4 -3.6 7.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.0 5.5 2.8 0.0 0.0 0.0 0.0 8.3 HEATING DEG. DAYS(BASE 18 0C) 613.8 605.2 461.4 262.3 214.3 109.3 36.5 16.4 152.3 283.2 406.5 670.9 3832.2 DEWPOINT (MEAN C) -5.3 -8.5 -2.4 1.4 3.6 5.8 9.4 9.6 2.7 2.8 -0.0 -7.8 0.9 MIXING RATIO (G/KG) 3.28 2.67 3.99 5.36 6.26 7.24 9.18 9.33 5.92 5.87 4.79 2.85 5.56 VAPOUR PRESSURE (HPA) 4.29 3.49 5.21 7.00 8.17 9.42 11.89 12.11 7.77 7.71 6.26 3.74 7.25 SATURATION DEF. (HPA) 1.28 1.33 2.64 5.56 6.43 8.34 9.09 9.44 8.15 4.05 2.25 1.30 4.99 RELATIVE HUMIDITY (MEAN %) 79 75 71 63 64 61 61 61 56 71 77 77 68 RELATIVE HUMIDITY (MAX. %) 92 91 89 90 92 84 82 82 85 93 94 93 89 RELATIVE HUMIDITY (MIN. %) 58 54 51 37 37 40 43 42 33 47 56 57 46 RELATIVE HUMIDITY (MEAN% 03UTC) 87 85 85 85 85 73 72 75 77 91 87 85 82 RELATIVE HUMIDITY (MEAN% 09UTC) 64 62 58 45 43 49 48 45 36 52 64 62 52 RELATIVE HUMIDITY (MEAN% 15UTC) 75 67 61 49 53 52 58 55 51 65 71 73 61 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 41.6 68.5 29.3 41.0 76.2 3.7 0.0 0.0 5.5 33.0 102.3 29.7 430.8 DAYS WITH PRECIPITATION >=10 1 1 1 2 3 0 0 0 0 1 3 0 12 DAYS WITH PRECIPITATION >= 5 3 4 1 4 8 0 0 0 0 2 5 2 29 DAYS WITH PRECIPITATION >= 1 7 11 6 6 9 2 0 0 2 4 13 7 67 DAYS WITH PRECIPITATION 13 18 14 11 10 3 0 0 3 8 16 14 110 GREATEST DAILY PRECIPITATION 10.4 22.0 16.6 11.0 16.4 2.0 0.0 0.0 4.5 24.0 37.6 8.2 37.6 DAY 4 14 7 25 6 22 ** ** 29 15 5 20 DAY WITH THUNDER STORM 1 1 2 3 4 0 0 1 4 0 0 0 16 DAYS WITH SNOW OR SLEET 9 18 11 0 0 0 0 0 0 0 6 15 59 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 1 0 1 WIND DIRECTION (PREVAILING) 270 270 270 270 270 90 90 90 90 90 270 225 90 PREVAILING WIND SPEED(KNOTS) 5.7 6.8 5.5 6.0 6.7 9.9 9.3 8.6 7.2 6.5 6.5 8.3 8.7 PREVAILING WIND PERCENT 9.7 13.4 10.1 21.3 12.9 33.3 50.0 43.1 23.8 15.7 20.0 12.1 17.4 CALMS PERCENT OF WIND 70.2 58.5 59.3 51.3 56.5 33.8 24.6 31.5 58.8 66.5 47.5 61.7 51.6 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 266 255 213 235 232 104 100 101 101 124 229 237 123 VECTOR WIND MAGNITUDE(KNOTS) 0.9 0.5 0.3 1.6 0.8 4.4 6.0 5.0 2.2 1.0 1.5 1.9 1.2 WIND STEADINESES (MEAN %) 52.9 16.7 10.3 50.0 27.6 72.1 90.9 89.3 78.6 45.5 36.6 63.3 32.4 WIND SPEED (MEAN KNOTS) 1.7 3.0 2.9 3.2 2.9 6.1 6.6 5.6 2.8 2.2 4.1 3.0 3.7 FASTEST WIND DIRECTION 240 240 320 180 320 280 120 140 80 100 90 220 90 FASTEST WIND SPEED (KNOTS) 14 19 23 23 23 23 23 23 16 16 31 23 31 DAY 29 1 17 1 10 16 9 10 1 15 6 1 DAYS WITH SKY CLEAR (0-2)/8 9 6 7 9 12 19 23 28 19 11 7 7 157 DAYS WITH P.CLOUDY (3-6)/8 11 9 14 13 15 8 8 3 8 16 12 14 131 DAYS WITH CLOUDY (7-8)/8 11 13 10 8 4 3 0 0 3 4 11 10 77 DAYS WITH VISIBILITY =< 2 KM 3 0 2 1 0 1 0 0 0 1 1 0 9 DURATION OF SUNSHINE HOURS 126.5 44.0 184.0 225.2 277.7 334.7 368.1 345.9 270.7 214.0 154.0 119.4 2664.2 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 820.1 817.6 818.7 820.9 820.6 818.7 818.1 819.3 825.6 825.6 820.0 820.4 820.5 MAX. QFE PRESSURE IN HPA 828.9 828.2 825.0 828.7 826.2 823.2 822.6 825.2 831.3 831.3 829.6 828.0 831.3 DAY-HOUR 9- 6 18- 9 18- 6 5- 6 18- 6 8- 9 13- 6 15- 6 23- 6 11- 6 2- 6 21-18 MIN. QFE PRESSURE IN HPA 809.0 806.8 808.2 811.0 812.2 813.0 811.7 812.4 819.4 819.0 810.5 805.2 805.2 DAY-HOUR 16-12 1- 0 7-12 1-15 1- 0 15-15 30-15 1-15 7-15 14-12 26- 0 3-15 MEAN QNH PRESSURE IN HPA 1018.7 1015.7 1017.0 1019.6 1019.2 1017.0 1016.3 1017.8 1025.3 1025.2 1018.6 1019.1 1019.1 MAX. QNH PRESSURE IN HPA 1029.2 1028.4 1024.5 1029.0 1026.0 1022.4 1021.7 1024.8 1032.1 1032.1 1030.0 1028.1 1032.1 DAY-HOUR 9- 6 18- 9 18- 6 5- 6 18- 6 8- 9 13- 6 15- 6 23- 6 11- 6 2- 6 21-18 MIN. QNH PRESSURE IN HPA 1005.5 1002.8 1004.5 1007.9 1009.3 1010.2 1008.7 1009.5 1017.9 1017.4 1007.3 1000.9 1000.9 DAY-HOUR 16-12 1- 0 7-12 1-15 1- 0 15-15 30-15 1-15 7-15 14-12 26- 0 3-15 MEAN QFF PRESSURE IN HPA 1022.7 1021.6 1017.2 1014.7 1012.5 1007.9 1004.8 1005.9 1017.9 1021.0 1017.7 1025.1 1015.8 MAX. QFF PRESSURE IN HPA 1035.6 1044.1 1030.3 1031.0 1023.0 1015.7 1012.7 1012.6 1027.1 1031.7 1029.5 1047.0 1047.0 DAY-HOUR 9- 6 19- 6 2-18 5- 3 19- 3 27-18 1-12 7-18 24- 3 9- 3 10- 3 7- 3 MIN. QFF PRESSURE IN HPA 1005.6 1001.5 1002.2 1001.7 1002.7 998.1 992.1 995.4 1009.9 1009.2 1005.9 998.9 992.1 DAY-HOUR 31-21 1- 0 7- 0 1-21 1- 0 2-12 30-12 10-12 2-12 14-12 26-12 3-15 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 820.3 817.1 818.5 820.9 820.4 818.6 818.3 819.4 825.6 825.4 820.0 820.2 820.4 MAX. QFE PRESSURE IN HPA 828.4 826.8 824.2 827.6 825.6 822.0 821.7 824.0 831.2 830.7 827.6 827.1 831.2 DAY 10 19 1 5 18 8 13 15 24 11 2 22 MIN. QFE PRESSURE IN HPA 811.6 806.8 808.5 812.0 812.2 815.4 814.1 815.1 820.4 820.5 810.5 805.6 805.6 DAY 16 1 12 2 1 3 20 2 8 15 26 4 MEAN QNH PRESSURE IN HPA 1018.9 1015.2 1016.8 1019.6 1019.1 1016.9 1016.5 1017.9 1025.2 1025.0 1018.6 1018.9 1019.1 MAX. QNH PRESSURE IN HPA 1028.6 1026.7 1023.6 1027.6 1025.3 1021.0 1020.6 1023.4 1031.9 1031.3 1027.6 1027.1 1031.9 DAY 10 19 1 5 18 8 13 15 24 11 2 22 MIN. QNH PRESSURE IN HPA 1008.6 1002.8 1004.9 1009.0 1009.3 1013.1 1011.6 1012.7 1019.1 1019.2 1007.3 1001.4 1001.4 DAY 16 1 12 2 1 3 20 2 8 15 26 4 MEAN QFF PRESSURE IN HPA 1022.5 1020.3 1016.7 1014.7 1012.8 1007.9 1004.9 1005.7 1017.5 1020.4 1017.1 1024.2 1015.4 MAX. QFF PRESSURE IN HPA 1033.7 1040.9 1028.4 1029.0 1022.0 1013.1 1011.8 1011.1 1025.5 1028.8 1028.4 1042.3 1042.3 DAY 19 19 1 5 18 28 1 8 24 9 10 7 MIN. QFF PRESSURE IN HPA 1009.7 1001.5 1002.2 1003.5 1002.7 1000.3 995.9 998.8 1010.0 1009.4 1006.8 1001.9 995.9 DAY 16 1 7 2 1 3 30 2 28 15 26 4 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 820.1 817.1 818.8 821.0 820.7 818.9 818.5 819.7 825.8 825.6 820.3 820.2 820.6 MAX. QFE PRESSURE IN HPA 828.0 826.6 824.2 827.6 826.0 822.8 821.9 824.5 830.4 831.0 828.3 826.6 831.0 DAY 9 18 1 5 18 8 13 15 23 11 2 22 MIN. QFE PRESSURE IN HPA 810.0 807.4 808.7 811.7 812.8 815.8 814.5 815.0 821.6 821.2 811.7 806.0 806.0 DAY 16 1 12 2 1 3 20 2 8 15 26 4 MEAN QNH PRESSURE IN HPA 1018.7 1015.1 1017.2 1019.8 1019.4 1017.3 1016.8 1018.2 1025.5 1025.3 1018.9 1018.8 1019.3 MAX. QNH PRESSURE IN HPA 1028.1 1026.5 1023.6 1027.6 1025.7 1021.9 1020.9 1024.0 1031.0 1031.7 1028.5 1026.5 1031.7 DAY 9 18 1 5 18 8 13 15 23 11 2 22 MIN. QNH PRESSURE IN HPA 1006.7 1003.6 1005.1 1008.7 1010.0 1013.6 1012.0 1012.6 1020.5 1020.0 1008.7 1001.9 1001.9 DAY 16 1 12 2 1 3 20 2 8 15 26 4 MEAN QFF PRESSURE IN HPA 1023.5 1021.2 1018.2 1016.1 1013.6 1008.6 1006.1 1007.2 1019.5 1022.5 1018.9 1025.6 1016.7 MAX. QFF PRESSURE IN HPA 1035.2 1043.2 1029.8 1031.0 1023.0 1014.3 1012.5 1012.2 1027.1 1031.7 1029.5 1047.0 1047.0 DAY 10 19 1 5 19 28 10 7 24 9 10 7 MIN. QFF PRESSURE IN HPA 1007.5 1004.1 1003.4 1004.6 1004.1 1000.8 997.6 999.3 1012.9 1011.2 1007.9 1003.3 997.6 DAY 16 1 7 2 1 25 30 2 28 15 23 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 820.9 817.9 819.6 821.4 820.9 819.0 818.5 819.8 826.2 826.4 821.0 821.1 821.1 MAX. QFE PRESSURE IN HPA 828.9 828.0 825.0 828.7 826.2 823.1 822.6 825.2 831.3 831.3 829.6 827.2 831.3 DAY 9 18 18 5 18 8 13 15 23 11 2 22 MIN. QFE PRESSURE IN HPA 810.2 807.0 809.0 812.1 813.6 815.5 814.6 814.9 821.6 822.2 812.7 808.3 807.0 DAY 16 1 12 2 1 15 20 1 7 14 26 4 MEAN QNH PRESSURE IN HPA 1019.7 1016.1 1018.1 1020.2 1019.7 1017.3 1016.8 1018.4 1026.0 1026.2 1019.8 1019.9 1019.8 MAX. QNH PRESSURE IN HPA 1029.2 1028.1 1024.5 1029.0 1026.0 1022.3 1021.7 1024.8 1032.1 1032.1 1030.0 1027.2 1032.1 DAY 9 18 18 5 18 8 13 15 23 11 2 22 MIN. QNH PRESSURE IN HPA 1006.9 1003.1 1005.5 1009.2 1011.0 1013.2 1012.1 1012.5 1020.5 1021.2 1009.9 1004.6 1003.1 DAY 16 1 12 2 1 15 20 1 7 14 26 4 MEAN QFF PRESSURE IN HPA 1024.3 1022.9 1018.8 1014.9 1012.4 1008.1 1005.5 1006.7 1018.1 1021.9 1019.1 1026.5 1016.6 MAX. QFF PRESSURE IN HPA 1035.6 1044.1 1029.9 1030.4 1021.1 1013.6 1012.1 1012.6 1025.4 1029.5 1028.2 1045.4 1045.4 DAY 9 19 2 5 18 28 1 15 23 9 10 7 MIN. QFF PRESSURE IN HPA 1008.6 1003.4 1004.2 1002.7 1004.7 1000.4 996.2 1000.4 1011.5 1015.1 1009.6 1006.7 996.2 DAY 16 1 7 30 13 17 20 1 2 14 26 3 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 820.3 817.8 819.1 821.2 820.5 818.6 818.0 819.1 825.7 825.7 820.1 820.5 820.6 MAX. QFE PRESSURE IN HPA 828.5 828.2 824.1 827.7 826.2 823.2 822.2 824.7 830.6 831.0 827.6 827.0 831.0 DAY 9 18 18 5 18 8 13 15 23 11 2 21 MIN. QFE PRESSURE IN HPA 809.6 807.5 808.8 812.7 813.2 814.3 813.6 813.6 820.7 821.3 811.5 806.3 806.3 DAY 16 1 12 2 1 15 30 1 7 14 26 4 MEAN QNH PRESSURE IN HPA 1019.0 1016.0 1017.5 1020.0 1019.2 1016.9 1016.2 1017.6 1025.4 1025.4 1018.7 1019.2 1019.2 MAX. QNH PRESSURE IN HPA 1028.7 1028.4 1023.5 1027.8 1026.0 1022.4 1021.2 1024.2 1031.2 1031.7 1027.6 1026.9 1031.7 DAY 9 18 18 5 18 8 13 15 23 11 2 21 MIN. QNH PRESSURE IN HPA 1006.2 1003.7 1005.2 1009.9 1010.5 1011.8 1011.0 1011.0 1019.4 1020.1 1008.5 1002.3 1002.3 DAY 16 1 12 2 1 15 30 1 7 14 26 4 MEAN QFF PRESSURE IN HPA 1022.4 1021.3 1017.2 1014.6 1012.2 1007.4 1004.2 1005.1 1017.2 1020.2 1017.1 1024.3 1015.3 MAX. QFF PRESSURE IN HPA 1032.0 1038.5 1027.5 1027.9 1021.9 1013.5 1011.9 1012.0 1023.5 1027.8 1026.6 1042.2 1042.2 DAY 9 19 1 5 18 28 1 6 23 11 10 7 MIN. QFF PRESSURE IN HPA 1006.2 1003.7 1004.5 1005.7 1004.1 999.0 994.4 996.7 1010.0 1013.8 1007.3 1002.5 994.4 DAY 16 1 7 30 1 2 30 1 7 14 26 3 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 819.5 817.2 818.0 820.4 820.0 818.0 817.3 818.4 824.8 825.0 819.2 819.9 819.8 MAX. QFE PRESSURE IN HPA 828.3 827.4 823.0 826.6 825.6 822.3 821.0 824.0 828.8 830.0 826.8 826.4 830.0 DAY 9 18 1 5 18 8 1 15 23 11 2 21 MIN. QFE PRESSURE IN HPA 809.0 808.8 808.2 812.4 813.0 813.7 812.2 812.9 819.7 819.0 810.6 806.3 806.3 DAY 16 1 7 30 1 15 30 1 7 14 26 3 MEAN QNH PRESSURE IN HPA 1018.0 1015.2 1016.2 1019.0 1018.6 1016.2 1015.3 1016.6 1024.4 1024.5 1017.7 1018.5 1018.3 MAX. QNH PRESSURE IN HPA 1028.5 1027.4 1022.2 1026.5 1025.3 1021.3 1019.8 1023.4 1029.1 1030.5 1026.7 1026.2 1030.5 DAY 9 18 1 5 18 8 1 15 23 11 2 21 MIN. QNH PRESSURE IN HPA 1005.5 1005.2 1004.5 1009.5 1010.2 1011.1 1009.3 1010.1 1018.2 1017.4 1007.4 1002.3 1002.3 DAY 16 1 7 30 1 15 30 1 7 14 26 3 MEAN QFF PRESSURE IN HPA 1021.4 1020.4 1015.8 1014.1 1012.2 1007.0 1003.5 1004.4 1016.6 1019.8 1016.2 1023.8 1014.6 MAX. QFF PRESSURE IN HPA 1032.3 1036.9 1026.2 1026.0 1021.8 1014.0 1012.7 1011.8 1022.6 1027.6 1026.0 1041.3 1041.3 DAY 9 19 1 5 18 28 1 6 23 11 10 7 MIN. QFF PRESSURE IN HPA 1006.3 1005.4 1002.9 1002.7 1003.9 998.1 992.1 995.4 1009.9 1009.2 1005.9 1000.0 992.1 DAY 16 1 7 30 5 2 30 10 2 14 26 3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 819.8 817.5 818.2 820.2 820.1 818.0 817.2 818.4 825.0 825.2 819.8 820.3 820.0 MAX. QFE PRESSURE IN HPA 828.6 827.2 823.3 826.2 825.6 821.9 821.0 823.5 828.8 830.0 826.8 827.1 830.0 DAY 9 18 1 4 18 8 1 15 23 11 2 21 MIN. QFE PRESSURE IN HPA 811.1 810.2 809.4 811.0 813.2 813.0 811.7 812.4 819.4 819.6 812.9 805.2 805.2 DAY 16 1 7 1 1 15 30 1 7 14 25 3 MEAN QNH PRESSURE IN HPA 1018.4 1015.6 1016.4 1018.9 1018.7 1016.2 1015.3 1016.6 1024.6 1024.8 1018.3 1019.0 1018.6 MAX. QNH PRESSURE IN HPA 1028.8 1027.2 1022.5 1026.0 1025.3 1020.9 1019.8 1022.8 1029.1 1030.5 1026.7 1027.1 1030.5 DAY 9 18 1 4 18 8 1 15 23 11 2 21 MIN. QNH PRESSURE IN HPA 1008.0 1006.9 1005.9 1007.9 1010.5 1010.2 1008.7 1009.5 1017.9 1018.1 1010.1 1000.9 1000.9 DAY 16 1 7 1 1 15 30 1 7 14 25 3 MEAN QFF PRESSURE IN HPA 1023.0 1021.8 1017.2 1015.0 1012.6 1007.4 1004.3 1005.5 1018.4 1021.8 1018.2 1025.8 1015.9 MAX. QFF PRESSURE IN HPA 1035.3 1040.5 1027.8 1027.5 1022.5 1015.3 1011.2 1011.9 1024.8 1029.8 1027.5 1045.8 1045.8 DAY 9 19 1 4 18 28 1 31 23 23 9 7 MIN. QFF PRESSURE IN HPA 1009.0 1007.9 1004.8 1001.8 1004.9 998.6 993.2 995.6 1011.0 1010.9 1009.6 998.9 993.2 DAY 16 1 7 30 5 15 30 1 7 14 17 3 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 820.1 818.1 818.9 821.0 820.9 819.2 818.5 819.8 826.0 825.9 820.1 820.7 820.8 MAX. QFE PRESSURE IN HPA 828.6 827.8 823.9 827.2 825.8 822.8 822.2 824.3 830.4 830.7 826.8 828.0 830.7 DAY 9 18 2 4 18 8 9 15 23 10 1 21 MIN. QFE PRESSURE IN HPA 812.3 810.5 810.8 811.4 813.6 815.1 813.7 814.3 820.3 820.5 812.2 806.0 806.0 DAY 16 11 11 1 1 15 19 1 7 14 25 3 MEAN QNH PRESSURE IN HPA 1018.8 1016.3 1017.2 1019.8 1019.6 1017.7 1016.9 1018.4 1025.8 1025.6 1018.7 1019.4 1019.5 MAX. QNH PRESSURE IN HPA 1028.8 1027.9 1023.2 1027.2 1025.5 1021.9 1021.2 1023.7 1031.0 1031.3 1026.7 1028.1 1031.3 DAY 9 18 2 4 18 8 9 15 23 10 1 21 MIN. QNH PRESSURE IN HPA 1009.4 1007.3 1007.6 1008.3 1011.0 1012.7 1011.1 1011.8 1018.9 1019.2 1009.3 1001.9 1001.9 DAY 16 11 11 1 1 15 19 1 7 14 25 3 MEAN QFF PRESSURE IN HPA 1023.2 1023.1 1017.7 1014.3 1012.2 1008.5 1005.5 1006.8 1017.9 1021.4 1018.2 1026.1 1016.2 MAX. QFF PRESSURE IN HPA 1035.5 1041.1 1030.3 1028.8 1022.7 1015.7 1012.5 1012.6 1022.8 1028.4 1027.5 1044.4 1044.4 DAY 9 18 2 4 17 27 9 7 23 23 9 7 MIN. QFF PRESSURE IN HPA 1010.7 1009.8 1007.9 1001.9 1005.0 1000.1 996.1 998.2 1010.5 1010.3 1009.2 1002.5 996.1 DAY 2 1 6 30 12 16 19 10 7 14 25 3 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 820.0 818.0 818.7 821.0 821.0 819.1 818.5 820.0 826.0 825.7 820.0 820.5 820.7 MAX. QFE PRESSURE IN HPA 828.6 827.8 823.3 827.2 825.6 822.4 822.0 824.0 831.2 830.7 827.3 827.6 831.2 DAY 9 18 2 4 17 8 9 14 23 10 1 21 MIN. QFE PRESSURE IN HPA 809.9 809.8 809.9 811.6 813.8 815.8 814.1 815.1 820.4 820.5 810.9 805.9 805.9 DAY 31 11 11 1 1 15 19 1 7 14 25 3 MEAN QNH PRESSURE IN HPA 1018.6 1016.2 1017.1 1019.7 1019.8 1017.5 1016.8 1018.6 1025.7 1025.4 1018.5 1019.2 1019.4 MAX. QNH PRESSURE IN HPA 1028.8 1027.9 1022.5 1027.2 1025.3 1021.4 1021.0 1023.4 1031.9 1031.3 1027.3 1027.6 1031.9 DAY 9 18 2 4 17 8 9 14 23 10 1 21 MIN. QNH PRESSURE IN HPA 1006.5 1006.4 1006.5 1008.6 1011.2 1013.6 1011.6 1012.7 1019.1 1019.2 1007.7 1001.8 1001.8 DAY 31 11 11 1 1 15 19 1 7 14 25 3 MEAN QFF PRESSURE IN HPA 1021.9 1021.7 1016.6 1014.2 1012.6 1008.3 1004.8 1006.2 1017.6 1020.4 1016.9 1024.5 1015.5 MAX. QFF PRESSURE IN HPA 1033.1 1041.1 1026.5 1029.5 1022.2 1015.1 1011.9 1012.1 1024.4 1027.3 1027.9 1041.4 1041.4 DAY 18 18 2 4 17 27 9 7 23 8 9 6 MIN. QFF PRESSURE IN HPA 1005.6 1007.2 1003.7 1001.7 1005.3 1000.6 997.0 998.0 1010.6 1009.2 1007.1 1001.5 997.0 DAY 31 11 6 1 1 16 30 10 7 14 30 3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -0.8 -0.7 3.2 8.1 12.0 15.1 18.7 20.4 14.9 7.3 3.3 -3.4 8.2 MINIMUN AIR TEMPERATURE (C) -4.5 -5.3 -3.8 1.9 4.7 7.1 12.9 12.2 6.4 0.3 -4.6 -8.8 1.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 17 18 18 2 0 0 0 0 0 3 16 29 103 DAYS WITH FREEZING MIN.<= 0 30 28 26 9 3 1 0 0 1 16 24 31 169 TEMPERATURE RECORDS LOWEST(C) -12.4 -12.4 -9.2 -4.4 -2.0 -0.8 8.2 8.0 -0.2 -5.2 -14.6 -17.5 -17.5 DAY 25 26 1 7 31 1 3 13 22 27 27 20 MAXIMUM AIR TEMPERATURE (C) 3.7 5.1 10.3 14.1 18.4 21.9 25.0 29.0 23.5 15.1 11.4 2.6 15.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 0 6 15 1 0 0 0 22 DAYS WITH MAXIMUM TEMP. <= 0 5 0 0 0 0 0 0 0 0 0 0 10 15 TEMPERATURE RECORDS HIGHEST(C) 7.6 11.4 16.8 19.6 23.4 29.4 32.8 34.8 30.0 25.6 17.0 8.8 34.8 DAY 3 22 24 3 21 21 15 5 8 3 1 30 DIF. BETWEEN (MAX.-MIN.) (C) 8.2 10.4 14.1 12.2 13.7 14.8 12.1 16.8 17.1 14.8 16.0 11.4 13.5 MEAN DAILY TEMP. (MDT) (C) -0.4 -0.1 3.2 8.0 11.5 14.5 19.0 20.6 15.0 7.7 3.4 -3.1 8.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.0 10.9 24.4 0.0 0.0 0.0 0.0 35.3 HEATING DEG. DAYS(BASE 18 0C) 571.2 507.4 458.1 299.2 200.5 106.4 19.1 3.6 97.2 320.7 437.8 653.8 3675.0 DEWPOINT (MEAN C) -3.8 -4.6 -3.0 0.1 2.9 7.0 10.1 9.4 5.4 0.5 -4.5 -7.0 1.0 MIXING RATIO (G/KG) 3.59 3.41 3.89 4.87 5.90 7.83 9.64 9.27 7.01 4.94 3.59 2.83 5.56 VAPOUR PRESSURE (HPA) 4.71 4.46 5.09 6.35 7.73 10.19 12.47 12.03 9.15 6.49 4.70 3.72 7.26 SATURATION DEF. (HPA) 1.20 1.60 3.08 4.96 7.00 7.91 9.86 13.57 9.44 4.61 4.03 1.31 5.72 RELATIVE HUMIDITY (MEAN %) 82 78 70 61 57 63 60 55 59 68 61 79 66 RELATIVE HUMIDITY (MAX. %) 95 95 95 87 85 89 80 80 89 94 87 95 89 RELATIVE HUMIDITY (MIN. %) 63 56 42 38 35 41 44 33 33 39 35 55 43 RELATIVE HUMIDITY (MEAN% 03UTC) 90 90 91 80 74 82 70 78 84 89 79 91 83 RELATIVE HUMIDITY (MEAN% 09UTC) 70 62 51 48 40 44 47 37 38 44 42 62 49 RELATIVE HUMIDITY (MEAN% 15UTC) 77 69 53 51 49 53 58 45 50 59 50 70 57 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 43.3 9.5 42.7 61.7 36.6 59.7 0.5 0.0 44.6 9.5 6.0 1.4 315.5 DAYS WITH PRECIPITATION >=10 2 0 1 3 1 2 0 0 1 0 0 0 10 DAYS WITH PRECIPITATION >= 5 3 1 2 5 3 3 0 0 3 1 0 0 21 DAYS WITH PRECIPITATION >= 1 10 3 9 11 5 8 0 0 8 2 2 0 58 DAYS WITH PRECIPITATION 13 10 13 13 10 11 2 0 9 4 6 3 94 GREATEST DAILY PRECIPITATION 12.0 5.1 15.0 14.1 12.0 26.0 0.4 0.0 21.0 5.7 3.0 0.7 26.0 DAY 11 5 17 24 6 3 2 ** 20 24 24 17 DAY WITH THUNDER STORM 0 0 3 4 5 7 0 1 5 1 0 0 26 DAYS WITH SNOW OR SLEET 13 10 8 0 0 0 0 0 0 0 2 3 36 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 270 270 270 270 90 90 90 90 90 90 225 90 90 PREVAILING WIND SPEED(KNOTS) 7.4 6.1 7.0 8.3 8.4 8.6 9.9 10.2 8.2 8.5 9.2 11.4 9.3 PREVAILING WIND PERCENT 14.9 9.8 14.5 20.4 19.0 18.3 45.6 26.6 15.4 18.5 16.7 10.1 14.4 CALMS PERCENT OF WIND 65.3 68.8 62.5 45.0 49.2 55.0 28.6 45.2 60.4 53.2 62.1 63.6 54.8 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 247 2919 VECTOR WIND DIRECTION (MEAN) 261 162 237 235 159 121 104 105 120 119 245 113 146 VECTOR WIND MAGNITUDE(KNOTS) 1.7 0.5 1.9 2.5 1.4 2.1 6.3 3.6 1.5 1.4 2.7 0.7 1.1 WIND STEADINESES (MEAN %) 68.0 21.7 63.3 52.1 29.8 55.3 90.0 70.6 48.4 38.9 84.4 22.6 28.2 WIND SPEED (MEAN KNOTS) 2.5 2.3 3.0 4.8 4.7 3.8 7.0 5.1 3.1 3.6 3.2 3.1 3.9 FASTEST WIND DIRECTION 280 190 190 210 200 220 80 60 110 60 190 90 190 FASTEST WIND SPEED (KNOTS) 23 16 29 29 27 21 23 27 19 23 31 19 31 DAY 1 4 25 19 1 29 13 14 4 9 11 8 DAYS WITH SKY CLEAR (0-2)/8 10 8 13 3 11 17 22 28 19 19 21 10 181 DAYS WITH P.CLOUDY (3-6)/8 14 10 7 17 13 8 9 3 9 10 6 13 119 DAYS WITH CLOUDY (7-8)/8 7 10 11 10 7 5 0 0 2 2 3 8 65 DAYS WITH VISIBILITY =< 2 KM 4 1 1 0 0 0 0 0 0 0 0 1 7 DURATION OF SUNSHINE HOURS 159.4 162.5 216.9 ****** ****** 236.9 362.5 363.0 266.7 251.4 214.2 144.5 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 821.1 819.6 819.0 818.6 822.3 819.6 817.5 819.5 821.3 824.2 821.5 822.1 820.5 MAX. QFE PRESSURE IN HPA 829.7 826.4 828.4 824.4 827.1 826.0 822.4 824.2 827.7 832.8 829.4 828.3 832.8 DAY-HOUR 7- 6 12- 6 3- 6 12-21 23-18 2-21 4- 6 31-21 13- 6 25- 6 15-18 10- 6 MIN. QFE PRESSURE IN HPA 811.8 809.7 810.0 812.5 813.2 810.4 812.0 814.0 814.9 816.9 811.6 817.2 809.7 DAY-HOUR 17- 0 5- 6 26-12 19-12 2-12 29-12 15-15 22-15 19-12 11-12 11- 9 16-12 MEAN QNH PRESSURE IN HPA 1020.0 1018.2 1017.4 1016.9 1021.3 1018.1 1015.6 1018.0 1020.1 1023.6 1020.4 1021.1 1019.2 MAX. QNH PRESSURE IN HPA 1030.2 1026.2 1028.6 1023.8 1027.1 1025.7 1021.4 1023.6 1027.8 1033.8 1029.8 1028.5 1033.8 DAY-HOUR 7- 6 12- 6 3- 6 12-21 23-18 2-21 4- 6 31-21 13- 6 25- 6 15-18 10- 6 MIN. QNH PRESSURE IN HPA 1008.8 1006.3 1006.7 1009.6 1010.5 1007.1 1009.0 1011.4 1012.5 1014.9 1008.6 1015.2 1006.3 DAY-HOUR 17- 0 5- 6 26-12 19-12 2-12 29-12 15-15 22-15 19-12 11-12 11- 9 16-12 MEAN QFF PRESSURE IN HPA 1023.2 1021.2 1017.3 1012.9 1014.4 1008.6 1003.3 1004.7 1010.9 1020.4 1020.3 1026.5 1015.3 MAX. QFF PRESSURE IN HPA 1035.5 1031.5 1031.5 1023.3 1021.3 1018.9 1011.3 1014.9 1024.9 1034.4 1035.1 1037.6 1037.6 DAY-HOUR 7- 6 12- 6 3- 3 7- 3 25-15 1- 3 23- 6 25- 3 22- 3 17-18 28- 3 20- 6 MIN. QFF PRESSURE IN HPA 1008.3 1006.3 1001.4 1001.9 1002.1 995.4 992.2 996.0 999.7 1004.3 1003.3 1019.0 992.2 DAY-HOUR 16-21 5- 0 25-12 19-12 2-12 29-12 15-15 5-21 4-21 3-18 11- 9 22- 9 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 821.1 819.5 818.9 818.4 822.1 819.8 817.5 819.7 821.4 824.2 821.6 822.2 820.5 MAX. QFE PRESSURE IN HPA 829.3 824.4 826.1 824.1 826.6 823.3 820.7 823.4 827.0 831.7 828.7 827.6 831.7 DAY 7 14 3 13 26 1 23 25 13 25 16 10 MIN. QFE PRESSURE IN HPA 811.8 809.8 811.0 813.3 815.5 813.8 813.5 816.7 815.6 818.2 815.3 817.7 809.8 DAY 17 5 26 19 7 29 2 8 20 11 24 16 MEAN QNH PRESSURE IN HPA 1019.9 1018.0 1017.3 1016.7 1021.1 1018.3 1015.6 1018.2 1020.3 1023.5 1020.5 1021.2 1019.2 MAX. QNH PRESSURE IN HPA 1029.7 1023.8 1025.9 1023.5 1026.5 1022.5 1019.4 1022.6 1026.9 1032.5 1029.0 1027.6 1032.5 DAY 7 14 3 13 26 1 23 25 13 25 16 10 MIN. QNH PRESSURE IN HPA 1008.8 1006.4 1007.9 1010.6 1013.2 1011.2 1010.8 1014.7 1013.3 1016.4 1013.0 1015.8 1006.4 DAY 17 5 26 19 7 29 2 8 20 11 24 16 MEAN QFF PRESSURE IN HPA 1022.5 1020.4 1016.8 1012.4 1014.6 1009.3 1003.0 1004.5 1010.8 1019.8 1019.7 1026.1 1015.0 MAX. QFF PRESSURE IN HPA 1034.0 1027.4 1027.9 1023.0 1019.9 1017.8 1009.3 1013.0 1023.7 1031.8 1031.5 1035.7 1035.7 DAY 7 25 3 7 26 1 23 25 22 25 28 20 MIN. QFF PRESSURE IN HPA 1009.3 1006.3 1001.7 1002.1 1007.0 998.5 993.4 996.9 1001.6 1004.8 1006.2 1019.4 993.4 DAY 17 5 25 19 5 30 16 8 5 4 24 16 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 821.1 819.6 819.2 818.9 822.4 820.2 818.0 820.1 821.6 824.4 821.7 822.1 820.8 MAX. QFE PRESSURE IN HPA 829.3 824.8 827.2 823.9 826.6 823.5 821.0 823.4 827.2 831.7 828.7 827.6 831.7 DAY 7 12 3 13 23 1 4 25 13 25 16 10 MIN. QFE PRESSURE IN HPA 813.1 809.8 811.2 813.3 815.9 813.1 813.5 817.0 815.9 818.2 814.3 817.8 809.8 DAY 17 5 26 19 2 29 2 22 20 11 24 22 MEAN QNH PRESSURE IN HPA 1019.9 1018.2 1017.6 1017.3 1021.4 1018.8 1016.1 1018.7 1020.5 1023.8 1020.6 1021.1 1019.5 MAX. QNH PRESSURE IN HPA 1029.7 1024.3 1027.2 1023.2 1026.5 1022.8 1019.8 1022.6 1027.2 1032.5 1029.0 1027.6 1032.5 DAY 7 12 3 13 23 1 4 25 13 25 16 10 MIN. QNH PRESSURE IN HPA 1010.4 1006.4 1008.1 1010.6 1013.7 1010.4 1010.8 1015.0 1013.7 1016.4 1011.8 1016.0 1006.4 DAY 17 5 26 19 2 29 2 22 20 11 24 22 MEAN QFF PRESSURE IN HPA 1023.8 1022.0 1018.5 1014.0 1015.3 1010.1 1004.5 1006.6 1012.7 1021.9 1021.8 1027.6 1016.6 MAX. QFF PRESSURE IN HPA 1034.7 1030.7 1031.5 1023.3 1020.9 1018.9 1011.0 1014.9 1024.9 1033.4 1035.1 1036.5 1036.5 DAY 7 25 3 7 31 1 23 25 22 27 28 19 MIN. QFF PRESSURE IN HPA 1012.4 1007.7 1002.6 1002.9 1007.2 998.6 994.9 999.6 1005.2 1008.1 1006.1 1020.4 994.9 DAY 17 5 25 19 2 29 16 6 5 4 24 22 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 822.2 820.5 819.9 819.3 822.6 819.9 818.0 820.2 822.0 825.1 822.3 822.8 821.3 MAX. QFE PRESSURE IN HPA 829.7 826.4 828.4 823.7 826.9 823.4 822.4 823.7 827.7 832.8 829.1 828.3 832.8 DAY 7 12 3 13 26 1 4 24 13 25 15 10 MIN. QFE PRESSURE IN HPA 814.7 809.7 811.2 812.9 815.7 812.7 813.2 816.6 816.7 819.9 813.5 818.1 809.7 DAY 11 5 26 19 2 29 2 22 19 11 24 22 MEAN QNH PRESSURE IN HPA 1021.2 1019.2 1018.5 1017.8 1021.7 1018.5 1016.2 1018.9 1021.0 1024.7 1021.4 1021.9 1020.1 MAX. QNH PRESSURE IN HPA 1030.2 1026.2 1028.6 1023.0 1026.8 1022.6 1021.4 1023.0 1027.8 1033.8 1029.4 1028.5 1033.8 DAY 7 12 3 13 26 1 4 24 13 25 15 10 MIN. QNH PRESSURE IN HPA 1012.3 1006.3 1008.1 1010.1 1013.5 1009.9 1010.5 1014.5 1014.7 1018.5 1010.8 1016.3 1006.3 DAY 11 5 26 19 2 29 2 22 19 11 24 22 MEAN QFF PRESSURE IN HPA 1025.1 1022.8 1018.7 1013.6 1014.2 1008.6 1004.2 1005.6 1011.5 1021.6 1021.8 1028.1 1016.3 MAX. QFF PRESSURE IN HPA 1035.5 1031.5 1031.3 1021.2 1020.4 1015.5 1011.3 1013.0 1022.1 1032.6 1033.7 1037.6 1037.6 DAY 7 12 3 7 26 1 23 24 27 17 27 20 MIN. QFF PRESSURE IN HPA 1012.7 1008.1 1003.6 1002.4 1006.5 995.9 997.0 999.7 1002.5 1008.2 1005.7 1019.7 995.9 DAY 11 5 25 19 2 29 16 22 4 4 24 22 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 821.3 819.9 819.3 818.8 822.3 819.6 817.4 819.4 821.4 824.1 821.3 822.2 820.6 MAX. QFE PRESSURE IN HPA 829.2 825.5 827.2 823.7 826.9 822.7 821.7 823.8 826.8 831.1 828.7 827.4 831.1 DAY 7 13 3 12 26 1 4 24 13 17 15 10 MIN. QFE PRESSURE IN HPA 813.5 810.0 810.3 813.0 814.5 812.2 813.2 815.8 815.6 818.8 811.6 818.0 810.0 DAY 11 5 26 19 2 29 2 22 19 11 11 22 MEAN QNH PRESSURE IN HPA 1020.1 1018.4 1017.7 1017.2 1021.4 1018.1 1015.5 1017.9 1020.3 1023.5 1020.1 1021.2 1019.3 MAX. QNH PRESSURE IN HPA 1029.6 1025.1 1027.2 1023.0 1026.8 1021.8 1020.6 1023.1 1026.7 1031.8 1029.0 1027.4 1031.8 DAY 7 13 3 12 26 1 4 24 13 17 15 10 MIN. QNH PRESSURE IN HPA 1010.8 1006.7 1007.0 1010.2 1012.0 1009.3 1010.5 1013.6 1013.3 1017.2 1008.6 1016.2 1006.7 DAY 11 5 26 19 2 29 2 22 19 11 11 22 MEAN QFF PRESSURE IN HPA 1022.8 1020.8 1017.0 1013.0 1013.9 1008.2 1002.8 1003.9 1010.2 1019.5 1019.0 1025.5 1014.7 MAX. QFF PRESSURE IN HPA 1034.5 1028.2 1027.3 1020.5 1019.8 1014.8 1008.8 1012.3 1021.0 1032.3 1030.5 1033.5 1034.5 DAY 7 12 3 6 26 1 23 24 21 17 27 10 MIN. QFF PRESSURE IN HPA 1011.0 1006.7 1002.7 1004.0 1004.1 996.8 995.7 997.7 1000.1 1009.7 1003.3 1019.0 995.7 DAY 11 8 25 19 2 29 15 3 5 4 11 22 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 820.5 818.9 818.3 818.0 821.7 818.8 816.7 818.5 820.5 823.3 820.4 821.3 819.7 MAX. QFE PRESSURE IN HPA 828.4 824.6 826.1 822.7 826.4 821.8 820.0 823.3 825.9 830.8 828.0 826.5 830.8 DAY 6 13 3 12 23 1 4 24 13 17 15 10 MIN. QFE PRESSURE IN HPA 813.0 809.8 810.0 812.5 813.2 810.4 813.1 814.6 814.9 816.9 812.7 817.2 809.8 DAY 11 5 26 19 2 29 16 22 19 11 25 16 MEAN QNH PRESSURE IN HPA 1019.1 1017.3 1016.5 1016.1 1020.6 1017.1 1014.6 1016.8 1019.1 1022.5 1019.0 1020.1 1018.3 MAX. QNH PRESSURE IN HPA 1028.6 1024.1 1025.9 1021.8 1026.2 1020.7 1018.6 1022.5 1025.6 1031.5 1028.1 1026.3 1031.5 DAY 6 13 3 12 23 1 4 24 13 17 15 10 MIN. QNH PRESSURE IN HPA 1010.2 1006.4 1006.7 1009.6 1010.5 1007.1 1010.4 1012.1 1012.5 1014.9 1009.9 1015.2 1006.4 DAY 11 5 26 19 2 29 16 22 19 11 25 16 MEAN QFF PRESSURE IN HPA 1021.7 1019.6 1016.0 1011.8 1014.0 1008.0 1001.9 1003.0 1009.6 1018.7 1018.2 1024.8 1013.9 MAX. QFF PRESSURE IN HPA 1032.7 1027.2 1026.9 1019.5 1019.0 1014.7 1008.1 1011.6 1019.5 1032.2 1029.4 1033.2 1033.2 DAY 6 13 3 6 25 1 23 24 21 17 27 19 MIN. QFF PRESSURE IN HPA 1010.6 1007.7 1001.4 1001.9 1002.1 995.4 993.1 996.6 1000.9 1007.6 1007.0 1019.3 993.1 DAY 11 4 25 19 2 29 15 22 5 3 8 16 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 820.8 819.2 818.4 817.9 821.7 818.7 816.7 818.3 820.5 823.6 821.1 821.7 819.9 MAX. QFE PRESSURE IN HPA 829.4 824.7 825.7 822.4 827.1 822.0 819.7 822.9 826.1 831.2 828.8 827.0 831.2 DAY 6 13 3 12 25 1 5 24 21 24 15 9 MIN. QFE PRESSURE IN HPA 813.8 810.5 810.0 813.5 816.4 811.3 812.0 814.0 815.6 817.8 815.0 817.4 810.0 DAY 11 8 26 17 6 29 15 22 19 3 25 16 MEAN QNH PRESSURE IN HPA 1019.5 1017.7 1016.6 1016.1 1020.6 1017.1 1014.7 1016.6 1019.1 1022.9 1019.8 1020.7 1018.5 MAX. QNH PRESSURE IN HPA 1029.8 1024.2 1025.4 1021.4 1027.1 1021.0 1018.2 1022.0 1025.9 1031.9 1029.1 1026.9 1031.9 DAY 6 13 3 12 25 1 5 24 21 24 15 9 MIN. QNH PRESSURE IN HPA 1011.2 1007.3 1006.7 1010.8 1014.3 1008.2 1009.0 1011.4 1013.3 1016.0 1012.6 1015.5 1006.7 DAY 11 8 26 17 6 29 15 22 19 3 25 16 MEAN QFF PRESSURE IN HPA 1023.3 1021.4 1017.3 1012.7 1014.3 1008.1 1002.8 1004.3 1011.2 1020.9 1021.2 1026.9 1015.4 MAX. QFF PRESSURE IN HPA 1034.4 1029.5 1028.6 1019.5 1021.3 1015.5 1009.2 1012.1 1021.8 1033.7 1034.3 1036.2 1036.2 DAY 6 13 3 6 25 1 5 31 21 17 27 19 MIN. QFF PRESSURE IN HPA 1012.0 1008.5 1003.4 1004.5 1006.0 996.4 992.2 998.0 1003.4 1007.7 1008.9 1020.3 992.2 DAY 11 4 25 18 2 29 15 22 4 3 23 15 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 821.2 819.9 819.1 818.7 822.7 819.8 817.9 819.7 821.6 824.6 821.9 822.4 820.8 MAX. QFE PRESSURE IN HPA 829.6 825.5 826.2 823.9 827.1 824.2 820.6 824.1 826.8 832.0 829.4 827.4 832.0 DAY 6 13 2 12 23 1 23 19 12 17 15 9 MIN. QFE PRESSURE IN HPA 813.0 811.9 811.6 813.6 817.8 813.7 812.8 815.3 816.5 818.1 814.5 817.7 811.6 DAY 16 8 25 19 2 29 15 22 4 10 25 15 MEAN QNH PRESSURE IN HPA 1020.1 1018.4 1017.6 1017.1 1021.8 1018.4 1016.1 1018.3 1020.5 1024.0 1020.8 1021.4 1019.5 MAX. QNH PRESSURE IN HPA 1030.0 1025.1 1026.0 1023.2 1027.1 1023.6 1019.3 1023.5 1026.7 1032.9 1029.8 1027.4 1032.9 DAY 6 13 2 12 23 1 23 19 12 17 15 9 MIN. QNH PRESSURE IN HPA 1010.2 1008.9 1008.6 1011.0 1016.0 1011.1 1010.0 1013.0 1014.4 1016.3 1012.0 1015.8 1008.6 DAY 16 8 25 19 2 29 15 22 4 10 25 15 MEAN QFF PRESSURE IN HPA 1023.9 1022.0 1017.6 1012.9 1014.4 1008.2 1003.9 1004.9 1011.1 1020.9 1021.3 1027.6 1015.7 MAX. QFF PRESSURE IN HPA 1034.4 1029.4 1028.6 1021.1 1019.0 1014.7 1010.7 1013.0 1022.7 1034.4 1033.7 1037.4 1037.4 DAY 6 13 3 6 25 1 23 19 21 17 27 19 MIN. QFF PRESSURE IN HPA 1009.8 1009.4 1004.9 1004.6 1006.7 996.6 993.9 996.6 999.9 1004.3 1007.6 1020.5 993.9 DAY 16 4 25 19 2 29 15 7 4 3 23 15 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 821.2 819.7 819.2 818.9 822.6 819.9 818.0 820.1 821.5 824.4 821.9 822.3 820.8 MAX. QFE PRESSURE IN HPA 829.6 825.5 826.9 824.4 827.1 826.0 820.7 824.2 827.2 831.7 829.2 827.6 831.7 DAY 6 13 2 12 25 2 22 31 12 24 15 9 MIN. QFE PRESSURE IN HPA 812.0 811.4 811.0 814.5 815.9 814.2 813.5 816.4 815.9 818.1 815.0 817.6 811.0 DAY 16 4 25 17 6 29 15 22 19 10 25 16 MEAN QNH PRESSURE IN HPA 1020.0 1018.2 1017.6 1017.2 1021.7 1018.4 1016.2 1018.7 1020.4 1023.9 1020.8 1021.3 1019.5 MAX. QNH PRESSURE IN HPA 1030.0 1025.1 1026.8 1023.8 1027.1 1025.7 1019.4 1023.6 1027.2 1032.5 1029.6 1027.6 1032.5 DAY 6 13 2 12 25 2 22 31 12 24 15 9 MIN. QNH PRESSURE IN HPA 1009.0 1008.3 1007.9 1012.0 1013.7 1011.7 1010.8 1014.3 1013.7 1016.3 1012.6 1015.7 1007.9 DAY 16 4 25 17 6 29 15 22 19 10 25 16 MEAN QFF PRESSURE IN HPA 1022.7 1020.7 1016.9 1012.9 1014.3 1008.4 1003.5 1004.7 1010.4 1019.9 1019.8 1025.6 1015.0 MAX. QFF PRESSURE IN HPA 1034.2 1028.0 1027.5 1022.7 1019.0 1016.9 1009.5 1012.1 1023.5 1031.7 1031.3 1035.4 1035.4 DAY 6 13 2 6 25 2 23 24 21 17 15 19 MIN. QFF PRESSURE IN HPA 1008.3 1006.3 1004.7 1005.8 1005.4 996.7 995.0 996.0 999.7 1006.3 1006.3 1019.4 995.0 DAY 16 4 16 18 6 29 15 5 4 3 23 21 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -5.1 -1.5 0.6 6.5 13.3 15.4 20.0 19.8 16.2 8.8 1.8 2.3 8.2 MINIMUN AIR TEMPERATURE (C) -10.0 -5.7 -3.3 1.3 6.4 8.2 13.8 11.4 7.7 2.7 -4.2 -1.8 2.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 24 17 9 3 0 0 0 0 0 1 19 8 81 DAYS WITH FREEZING MIN.<= 0 30 26 27 10 0 0 0 0 0 13 24 23 153 TEMPERATURE RECORDS LOWEST(C) -20.5 -22.2 -13.2 -5.2 0.6 2.6 3.0 5.8 0.6 -4.4 -11.0 -11.2 -22.2 DAY 16 4 17 4 2 7 16 27 21 29 13 1 MAXIMUM AIR TEMPERATURE (C) 0.4 3.9 5.1 12.2 19.8 22.3 26.1 27.7 24.6 15.8 9.6 7.5 14.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 1 4 12 0 0 0 0 17 DAYS WITH MAXIMUM TEMP. <= 0 15 5 3 1 0 0 0 0 0 0 0 0 24 TEMPERATURE RECORDS HIGHEST(C) 9.4 11.4 14.2 18.0 25.0 30.2 32.0 33.8 29.4 22.2 14.8 13.4 33.8 DAY 2 25 31 29 31 29 24 12 15 3 5 5 DIF. BETWEEN (MAX.-MIN.) (C) 10.4 9.6 8.4 10.9 13.4 14.1 12.3 16.3 16.9 13.1 13.8 9.3 12.4 MEAN DAILY TEMP. (MDT) (C) -4.8 -0.9 0.9 6.7 13.1 15.2 20.0 19.5 16.1 9.2 2.7 2.8 8.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.3 21.9 13.1 2.6 0.0 0.0 0.0 37.9 HEATING DEG. DAYS(BASE 18 0C) 706.7 548.4 530.0 338.3 151.9 89.4 12.6 11.1 67.4 271.4 459.1 469.9 3656.2 DEWPOINT (MEAN C) -7.4 -4.6 -3.0 -0.2 5.4 5.5 7.9 5.6 3.8 0.5 -3.4 -3.5 0.5 MIXING RATIO (G/KG) 2.88 3.47 3.94 4.78 7.03 7.06 8.46 7.23 6.34 5.00 3.77 3.70 5.31 VAPOUR PRESSURE (HPA) 3.78 4.54 5.13 6.25 9.18 9.20 11.01 9.43 8.27 6.56 4.97 4.85 6.93 SATURATION DEF. (HPA) 0.82 1.31 1.56 4.03 6.91 9.28 13.29 15.28 11.69 5.62 2.51 2.65 6.25 RELATIVE HUMIDITY (MEAN %) 85 82 79 66 64 56 49 46 51 62 72 69 65 RELATIVE HUMIDITY (MAX. %) 96 96 96 90 90 79 71 72 81 89 93 88 87 RELATIVE HUMIDITY (MIN. %) 67 63 57 42 39 37 32 23 25 34 44 46 42 RELATIVE HUMIDITY (MEAN% 03UTC) 92 91 89 83 83 72 63 66 78 79 91 79 81 RELATIVE HUMIDITY (MEAN% 09UTC) 73 70 64 54 47 42 39 31 32 42 49 51 50 RELATIVE HUMIDITY (MEAN% 15UTC) 82 76 75 55 53 48 45 38 35 57 65 65 58 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 22.3 40.1 40.4 127.6 51.0 0.6 20.9 1.0 8.8 49.4 10.0 19.7 391.8 DAYS WITH PRECIPITATION >=10 0 1 0 5 2 0 0 0 0 2 0 0 10 DAYS WITH PRECIPITATION >= 5 2 4 3 8 4 0 2 0 1 4 0 3 31 DAYS WITH PRECIPITATION >= 1 6 6 9 15 9 0 3 1 3 6 3 4 65 DAYS WITH PRECIPITATION 12 11 18 20 11 2 5 1 4 7 4 6 101 GREATEST DAILY PRECIPITATION 6.0 12.0 9.3 34.0 12.6 0.6 9.0 1.0 5.8 16.0 4.2 7.0 34.0 DAY 6 2 25 13 12 8 5 16 22 13 7 14 DAY WITH THUNDER STORM 0 0 0 4 6 4 5 2 0 3 0 0 24 DAYS WITH SNOW OR SLEET 11 9 15 3 0 0 0 0 0 0 0 3 41 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 90 90 90 270 90 90 90 90 270 270 270 270 90 PREVAILING WIND SPEED(KNOTS) 12.3 9.9 7.7 8.2 5.7 7.5 7.4 7.5 7.3 8.6 6.5 9.0 7.8 PREVAILING WIND PERCENT 14.1 9.1 11.7 14.6 10.5 36.7 41.1 35.9 15.8 11.7 6.3 17.7 16.4 CALMS PERCENT OF WIND 63.3 62.5 58.9 50.4 66.5 43.3 47.6 50.4 63.8 62.1 81.7 62.5 59.4 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 99 180 153 216 220 102 105 101 235 219 148 253 139 VECTOR WIND MAGNITUDE(KNOTS) 1.8 0.6 0.9 1.6 0.5 2.7 3.7 3.1 0.6 1.1 0.3 2.7 0.9 WIND STEADINESES (MEAN %) 48.6 18.8 27.3 41.0 23.8 67.5 94.9 86.1 23.1 34.4 23.1 79.4 28.1 WIND SPEED (MEAN KNOTS) 3.7 3.2 3.3 3.9 2.1 4.0 3.9 3.6 2.6 3.2 1.3 3.4 3.2 FASTEST WIND DIRECTION 70 110 120 230 250 80 100 80 290 280 120 260 70 FASTEST WIND SPEED (KNOTS) 29 27 27 19 17 19 19 17 23 27 19 23 29 DAY 9 1 18 22 18 10 12 14 29 27 7 22 DAYS WITH SKY CLEAR (0-2)/8 7 6 4 5 5 21 16 28 23 18 18 5 156 DAYS WITH P.CLOUDY (3-6)/8 11 12 14 15 19 8 14 3 6 7 8 14 131 DAYS WITH CLOUDY (7-8)/8 13 11 13 10 7 1 1 0 1 6 4 12 79 DAYS WITH VISIBILITY =< 2 KM 1 3 2 3 0 0 0 0 0 0 2 0 11 DURATION OF SUNSHINE HOURS 115.6 125.6 142.3 202.4 266.9 350.3 338.2 358.4 299.3 235.0 185.1 136.6 2755.7 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 820.7 818.5 816.7 819.5 821.3 820.2 821.7 820.9 820.2 823.3 825.7 822.1 820.9 MAX. QFE PRESSURE IN HPA 828.8 824.8 821.5 827.6 825.5 826.0 827.2 829.3 828.8 833.4 834.0 828.4 834.0 DAY-HOUR 26- 6 13- 6 28-18 4- 9 4- 3 11-18 3-21 29- 6 30-21 1-18 16-18 4- 6 MIN. QFE PRESSURE IN HPA 810.9 809.0 809.5 809.0 817.1 815.1 815.4 814.4 812.2 812.6 820.0 814.6 809.0 DAY-HOUR 6-12 1-21 26- 0 13- 0 29-15 18-15 7- 0 8-12 21-15 9-15 6-12 29-12 MEAN QNH PRESSURE IN HPA 1019.4 1016.7 1014.6 1018.0 1020.2 1018.8 1020.6 1019.7 1018.8 1022.5 1025.4 1021.1 1019.7 MAX. QNH PRESSURE IN HPA 1029.1 1024.3 1020.4 1027.6 1025.1 1025.7 1027.2 1029.7 1029.1 1034.6 1035.3 1028.6 1035.3 DAY-HOUR 26- 6 13- 6 28-18 4- 9 4- 3 11-18 3-21 29- 6 30-21 1-18 16-18 4- 6 MIN. QNH PRESSURE IN HPA 1007.7 1005.5 1006.1 1005.5 1015.1 1012.7 1013.1 1011.9 1009.3 1009.8 1018.6 1012.1 1005.5 DAY-HOUR 6-12 1-21 26- 0 13- 0 29-15 18-15 7- 0 8-12 21-15 9-15 6-12 29-12 MEAN QFF PRESSURE IN HPA 1026.2 1020.4 1016.5 1015.3 1012.2 1009.2 1007.7 1007.1 1008.7 1018.0 1026.7 1021.9 1015.8 MAX. QFF PRESSURE IN HPA 1041.9 1035.3 1026.5 1033.6 1021.4 1021.6 1017.7 1021.0 1022.1 1032.8 1042.0 1033.6 1042.0 DAY-HOUR 26- 6 3-18 17- 3 4- 6 7- 3 11-18 16- 0 29- 3 30-15 2- 3 18- 6 1-15 MIN. QFF PRESSURE IN HPA 1007.6 1002.0 1004.2 998.5 1004.4 998.4 1000.9 997.9 996.4 1005.1 1014.1 1008.9 996.4 DAY-HOUR 6-15 9-12 26- 0 13- 0 29- 6 18-21 24- 9 8-12 8-12 27- 0 6-12 29-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 820.7 818.3 816.3 819.3 821.3 820.2 821.7 821.0 820.3 823.3 825.7 822.2 820.8 MAX. QFE PRESSURE IN HPA 827.8 824.0 820.7 826.8 825.2 824.9 826.2 828.3 825.0 832.3 832.7 827.8 832.7 DAY 26 24 29 4 4 12 4 29 26 2 17 8 MIN. QFE PRESSURE IN HPA 814.6 811.2 809.5 809.0 817.4 815.9 815.4 814.9 812.5 814.4 821.2 817.2 809.0 DAY 19 2 26 13 29 19 7 8 22 27 29 25 MEAN QNH PRESSURE IN HPA 1019.4 1016.5 1014.1 1017.7 1020.1 1018.9 1020.6 1019.7 1018.9 1022.6 1025.4 1021.2 1019.6 MAX. QNH PRESSURE IN HPA 1027.9 1023.4 1019.4 1026.7 1024.8 1024.4 1026.0 1028.5 1024.5 1033.2 1033.7 1027.9 1033.7 DAY 26 24 29 4 4 12 4 29 26 2 17 8 MIN. QNH PRESSURE IN HPA 1012.1 1008.1 1006.1 1005.5 1015.5 1013.7 1013.1 1012.5 1009.6 1011.9 1020.0 1015.2 1005.5 DAY 19 2 26 13 29 19 7 8 22 27 29 25 MEAN QFF PRESSURE IN HPA 1025.5 1019.6 1015.8 1014.7 1012.2 1009.2 1007.7 1006.8 1008.2 1017.5 1025.7 1021.3 1015.4 MAX. QFF PRESSURE IN HPA 1037.6 1033.2 1024.9 1032.5 1018.9 1019.2 1017.7 1018.6 1017.0 1030.6 1037.7 1029.7 1037.7 DAY 26 4 17 4 22 12 16 29 25 19 17 4 MIN. QFF PRESSURE IN HPA 1012.1 1006.2 1004.2 998.5 1007.1 1001.2 1001.9 1000.1 998.5 1005.1 1015.4 1013.5 998.5 DAY 5 10 26 13 25 19 7 8 8 27 7 30 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 820.5 818.4 816.5 819.6 821.7 820.7 822.0 821.5 820.7 823.4 825.7 822.3 821.1 MAX. QFE PRESSURE IN HPA 827.8 824.0 820.9 826.8 825.5 824.9 825.9 829.1 825.5 832.3 832.7 827.5 832.7 DAY 26 24 29 4 4 12 4 29 25 2 17 8 MIN. QFE PRESSURE IN HPA 814.0 812.0 810.3 811.0 817.3 816.6 816.4 816.7 813.9 814.4 821.2 817.1 810.3 DAY 6 5 2 13 24 19 7 8 22 27 29 25 MEAN QNH PRESSURE IN HPA 1019.2 1016.7 1014.4 1018.1 1020.6 1019.4 1020.9 1020.3 1019.5 1022.7 1025.4 1021.3 1019.9 MAX. QNH PRESSURE IN HPA 1027.9 1023.4 1019.7 1026.7 1025.1 1024.4 1025.6 1029.4 1025.1 1033.2 1033.7 1027.5 1033.7 DAY 26 24 29 4 4 12 4 29 25 2 17 8 MIN. QNH PRESSURE IN HPA 1011.4 1009.0 1007.0 1007.9 1015.4 1014.5 1014.3 1014.7 1011.3 1011.9 1020.0 1015.1 1007.0 DAY 6 5 2 13 24 19 7 8 22 27 29 25 MEAN QFF PRESSURE IN HPA 1026.8 1020.9 1017.0 1016.0 1013.3 1010.4 1008.9 1008.9 1010.4 1019.5 1028.3 1022.9 1016.9 MAX. QFF PRESSURE IN HPA 1040.7 1035.2 1026.5 1033.4 1021.4 1020.1 1015.0 1021.0 1019.5 1032.8 1041.4 1033.2 1041.4 DAY 26 4 17 4 7 12 9 29 25 2 18 4 MIN. QFF PRESSURE IN HPA 1010.6 1007.8 1007.3 1004.3 1006.3 1003.5 1004.1 1003.4 998.7 1005.5 1017.0 1013.4 998.7 DAY 6 10 26 13 24 19 24 9 8 27 7 29 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 821.5 819.2 817.3 820.2 821.9 820.7 822.1 821.6 821.0 824.1 826.5 823.0 821.6 MAX. QFE PRESSURE IN HPA 828.8 824.8 821.2 827.4 825.4 825.1 826.4 829.3 826.2 831.4 833.5 828.4 833.5 DAY 26 13 15 4 7 12 3 29 25 2 16 4 MIN. QFE PRESSURE IN HPA 813.5 811.4 810.6 812.1 817.5 816.4 816.4 816.8 815.2 815.2 821.9 817.7 810.6 DAY 6 5 2 13 29 6 7 8 21 27 29 14 MEAN QNH PRESSURE IN HPA 1020.3 1017.7 1015.3 1018.8 1020.9 1019.5 1021.0 1020.5 1019.8 1023.5 1026.4 1022.1 1020.5 MAX. QNH PRESSURE IN HPA 1029.1 1024.3 1020.0 1027.4 1025.0 1024.7 1026.2 1029.7 1026.0 1032.2 1034.7 1028.6 1034.7 DAY 26 13 15 4 7 12 3 29 25 2 16 4 MIN. QNH PRESSURE IN HPA 1010.8 1008.3 1007.4 1009.2 1015.6 1014.3 1014.3 1014.8 1012.9 1012.9 1020.9 1015.8 1007.4 DAY 6 5 2 13 29 6 7 8 21 27 29 14 MEAN QFF PRESSURE IN HPA 1028.1 1021.7 1017.5 1016.1 1012.5 1009.7 1008.1 1007.6 1009.7 1019.1 1028.4 1023.5 1016.8 MAX. QFF PRESSURE IN HPA 1041.9 1034.6 1024.1 1033.6 1018.9 1020.1 1013.3 1020.1 1018.2 1030.6 1042.0 1033.5 1042.0 DAY 26 4 16 4 7 12 3 29 25 19 18 1 MIN. QFF PRESSURE IN HPA 1010.2 1008.4 1008.9 1003.7 1004.4 1001.8 1002.9 1001.3 999.4 1008.6 1019.0 1012.5 999.4 DAY 6 9 26 18 29 4 24 8 8 27 7 29 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 820.9 818.8 816.9 819.8 821.5 820.3 821.9 821.0 820.2 823.4 825.5 822.2 821.0 MAX. QFE PRESSURE IN HPA 828.0 824.4 821.0 827.6 824.8 825.4 827.1 829.3 826.3 830.8 832.8 827.6 832.8 DAY 10 13 15 4 7 11 3 29 25 1 16 4 MIN. QFE PRESSURE IN HPA 812.3 811.2 810.2 811.5 817.5 816.2 816.8 815.3 814.0 815.2 821.0 815.4 810.2 DAY 6 9 2 13 29 6 7 8 21 27 6 29 MEAN QNH PRESSURE IN HPA 1019.6 1017.2 1014.9 1018.4 1020.4 1018.9 1020.9 1019.8 1018.9 1022.6 1025.2 1021.2 1019.8 MAX. QNH PRESSURE IN HPA 1028.1 1023.8 1019.8 1027.6 1024.3 1025.0 1027.1 1029.7 1026.1 1031.5 1033.8 1027.6 1033.8 DAY 10 13 15 4 7 11 3 29 25 1 16 4 MIN. QNH PRESSURE IN HPA 1009.4 1008.1 1006.9 1008.5 1015.6 1014.1 1014.8 1013.0 1011.4 1012.9 1019.8 1013.1 1006.9 DAY 6 9 2 13 29 6 7 8 21 27 6 29 MEAN QFF PRESSURE IN HPA 1025.5 1020.3 1016.5 1015.4 1012.1 1009.0 1007.6 1006.4 1008.2 1017.3 1025.3 1021.3 1015.4 MAX. QFF PRESSURE IN HPA 1037.0 1031.2 1023.0 1032.9 1018.2 1019.6 1014.9 1020.9 1017.3 1026.6 1037.6 1029.7 1037.6 DAY 26 13 16 4 7 12 8 29 25 18 18 4 MIN. QFF PRESSURE IN HPA 1009.2 1003.6 1006.3 1002.5 1005.1 998.9 1000.9 998.8 998.0 1008.1 1015.1 1010.1 998.0 DAY 6 9 2 13 29 4 24 8 8 27 6 29 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 819.8 817.8 816.4 819.1 820.7 819.4 821.0 820.1 819.3 822.6 824.9 821.4 820.2 MAX. QFE PRESSURE IN HPA 827.2 823.4 820.6 826.9 824.3 824.8 826.2 828.3 825.5 830.4 831.9 826.5 831.9 DAY 9 13 28 4 7 11 3 29 30 1 16 7 MIN. QFE PRESSURE IN HPA 810.9 809.9 810.0 811.8 817.5 815.5 816.7 814.4 812.7 815.3 820.0 814.6 809.9 DAY 6 5 2 13 24 6 7 8 21 27 6 29 MEAN QNH PRESSURE IN HPA 1018.4 1015.9 1014.3 1017.5 1019.4 1017.9 1019.8 1018.7 1017.8 1021.7 1024.4 1020.2 1018.8 MAX. QNH PRESSURE IN HPA 1027.2 1022.6 1019.3 1026.8 1023.7 1024.3 1026.0 1028.5 1025.1 1031.0 1032.8 1026.3 1032.8 DAY 9 13 28 4 7 11 3 29 30 1 16 7 MIN. QNH PRESSURE IN HPA 1007.7 1006.5 1006.7 1008.8 1015.6 1013.2 1014.7 1011.9 1009.9 1013.0 1018.6 1012.1 1006.5 DAY 6 5 2 13 24 6 7 8 21 27 6 29 MEAN QFF PRESSURE IN HPA 1024.4 1019.0 1015.8 1014.4 1011.4 1008.2 1006.6 1005.8 1007.2 1016.7 1024.7 1020.2 1014.5 MAX. QFF PRESSURE IN HPA 1035.7 1028.2 1023.5 1032.2 1017.6 1018.6 1012.5 1019.2 1018.4 1028.9 1036.5 1028.2 1036.5 DAY 10 13 16 4 7 11 14 29 30 18 16 1 MIN. QFF PRESSURE IN HPA 1009.0 1002.0 1005.3 1003.3 1005.7 999.8 1001.4 997.9 996.4 1006.6 1014.1 1008.9 996.4 DAY 6 9 2 13 24 4 24 8 8 26 6 29 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 820.3 818.1 816.4 819.0 820.7 819.2 820.9 820.0 819.3 822.5 825.4 821.9 820.3 MAX. QFE PRESSURE IN HPA 828.2 823.5 821.0 826.5 824.6 824.8 825.5 828.3 826.9 830.9 832.9 826.9 832.9 DAY 9 22 15 4 3 11 3 29 30 1 16 7 MIN. QFE PRESSURE IN HPA 811.1 810.3 810.1 812.6 817.1 815.1 816.7 815.0 812.2 812.6 820.3 816.0 810.1 DAY 6 1 2 13 29 18 6 8 21 9 6 22 MEAN QNH PRESSURE IN HPA 1019.0 1016.3 1014.3 1017.4 1019.4 1017.6 1019.7 1018.6 1017.7 1021.6 1025.1 1020.8 1019.0 MAX. QNH PRESSURE IN HPA 1028.4 1022.8 1019.8 1026.3 1024.1 1024.3 1025.1 1028.5 1026.8 1031.6 1034.0 1026.8 1034.0 DAY 9 22 15 4 3 11 3 29 30 1 16 7 MIN. QNH PRESSURE IN HPA 1008.0 1007.0 1006.8 1009.8 1015.1 1012.7 1014.7 1012.6 1009.3 1009.8 1018.9 1013.8 1006.8 DAY 6 1 2 13 29 18 6 8 21 9 6 22 MEAN QFF PRESSURE IN HPA 1026.5 1020.5 1016.7 1015.2 1011.9 1008.6 1007.4 1007.1 1008.8 1018.3 1027.8 1022.3 1015.9 MAX. QFF PRESSURE IN HPA 1038.6 1033.9 1025.3 1032.5 1019.5 1019.7 1013.6 1020.4 1022.1 1030.4 1039.3 1033.6 1039.3 DAY 25 3 16 4 7 11 14 29 30 18 16 1 MIN. QFF PRESSURE IN HPA 1007.6 1003.8 1005.9 1005.8 1005.0 1000.3 1003.1 999.9 997.7 1005.4 1015.7 1012.7 997.7 DAY 6 9 25 13 28 4 24 9 8 26 6 29 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 820.9 818.7 817.0 819.7 821.6 820.5 822.0 821.3 820.3 823.6 826.0 822.3 821.1 MAX. QFE PRESSURE IN HPA 828.4 823.8 821.5 827.1 825.4 826.0 826.8 828.7 828.4 833.4 834.0 827.6 834.0 DAY 9 23 28 4 3 11 3 28 30 1 16 7 MIN. QFE PRESSURE IN HPA 813.0 810.1 811.7 811.6 817.7 815.4 817.0 816.5 813.8 816.2 820.6 816.9 810.1 DAY 6 1 25 12 28 18 6 7 21 26 6 24 MEAN QNH PRESSURE IN HPA 1019.7 1017.0 1015.0 1018.3 1020.5 1019.2 1021.0 1020.1 1019.0 1022.9 1025.7 1021.3 1020.0 MAX. QNH PRESSURE IN HPA 1028.6 1023.1 1020.4 1027.1 1025.0 1025.7 1026.7 1029.0 1028.6 1034.6 1035.3 1027.6 1035.3 DAY 9 23 28 4 3 11 3 28 30 1 16 7 MIN. QNH PRESSURE IN HPA 1010.2 1006.8 1008.7 1008.6 1015.8 1013.1 1015.0 1014.4 1011.2 1014.1 1019.3 1014.9 1006.8 DAY 6 1 25 12 28 18 6 7 21 26 6 24 MEAN QFF PRESSURE IN HPA 1027.4 1021.1 1016.9 1015.4 1012.0 1009.5 1007.9 1007.2 1008.9 1018.6 1027.8 1022.6 1016.3 MAX. QFF PRESSURE IN HPA 1040.1 1035.3 1025.8 1033.3 1017.8 1021.6 1013.0 1019.4 1021.0 1030.5 1040.3 1032.4 1040.3 DAY 25 3 16 4 7 11 3 29 30 1 18 3 MIN. QFF PRESSURE IN HPA 1010.4 1005.2 1008.6 1003.4 1004.8 999.5 1003.5 1000.2 999.5 1006.1 1015.1 1011.8 999.5 DAY 6 9 25 12 28 18 24 21 8 26 6 29 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 820.8 818.5 816.8 819.7 821.5 820.8 822.0 821.3 820.5 823.3 825.9 822.2 821.1 MAX. QFE PRESSURE IN HPA 828.0 823.8 821.5 826.8 825.4 825.9 827.2 828.3 828.8 832.3 833.8 828.2 833.8 DAY 9 23 28 3 17 11 3 28 30 1 16 3 MIN. QFE PRESSURE IN HPA 814.5 809.0 810.9 810.2 817.7 815.4 817.0 815.1 813.1 815.2 821.2 817.3 809.0 DAY 6 1 25 12 28 18 6 7 21 26 6 29 MEAN QNH PRESSURE IN HPA 1019.5 1016.8 1014.8 1018.2 1020.4 1019.5 1021.0 1020.1 1019.2 1022.5 1025.7 1021.2 1019.9 MAX. QNH PRESSURE IN HPA 1028.1 1023.1 1020.4 1026.7 1025.0 1025.6 1027.2 1028.5 1029.1 1033.2 1035.0 1028.4 1035.0 DAY 9 23 28 3 17 11 3 28 30 1 16 3 MIN. QNH PRESSURE IN HPA 1012.0 1005.5 1007.7 1006.9 1015.8 1013.1 1015.0 1012.7 1010.4 1012.9 1020.0 1015.4 1005.5 DAY 6 1 25 12 28 18 6 7 21 26 6 29 MEAN QFF PRESSURE IN HPA 1025.5 1020.1 1016.1 1015.2 1012.0 1009.6 1007.7 1006.8 1008.6 1017.3 1025.9 1021.2 1015.5 MAX. QFF PRESSURE IN HPA 1037.6 1032.7 1025.1 1032.2 1018.2 1020.6 1013.4 1018.2 1021.8 1029.5 1038.5 1030.9 1038.5 DAY 25 3 16 3 21 11 3 28 30 1 17 3 MIN. QFF PRESSURE IN HPA 1012.2 1005.4 1006.5 1000.9 1006.1 998.4 1002.4 999.7 999.6 1006.2 1014.4 1011.6 998.4 DAY 6 9 25 12 28 18 24 21 7 26 6 29 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -4.0 -7.0 -1.3 7.5 12.2 17.5 19.3 21.0 13.3 10.8 2.1 -1.3 7.5 MINIMUN AIR TEMPERATURE (C) -9.6 -14.1 -6.8 0.6 4.5 9.4 13.6 13.2 5.6 3.1 -2.7 -5.4 1.0 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 26 25 19 5 0 0 0 0 0 0 14 17 106 DAYS WITH FREEZING MIN.<= 0 29 28 27 12 2 0 0 0 0 8 25 28 159 TEMPERATURE RECORDS LOWEST(C) -31.5 -27.6 -23.6 -6.0 -1.5 4.5 7.4 8.0 0.6 -1.8 -8.0 -15.5 -31.5 DAY 29 7 10 12 12 2 8 31 16 30 28 22 MAXIMUM AIR TEMPERATURE (C) 2.4 0.4 4.4 14.4 18.9 24.8 25.6 28.8 21.7 19.0 8.7 3.7 14.4 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 1 9 16 0 0 0 0 26 DAYS WITH MAXIMUM TEMP. <= 0 10 14 4 0 0 0 0 0 0 0 0 5 33 TEMPERATURE RECORDS HIGHEST(C) 9.8 8.6 13.4 26.4 26.6 30.2 34.6 34.4 28.8 23.4 13.4 11.4 34.6 DAY 7 18 31 26 28 27 29 13 1 2 17 8 DIF. BETWEEN (MAX.-MIN.) (C) 12.0 14.5 11.2 13.8 14.4 15.4 12.0 15.6 16.1 15.9 11.4 9.1 13.4 MEAN DAILY TEMP. (MDT) (C) -3.6 -6.8 -1.2 7.5 11.7 17.1 19.6 21.0 13.6 11.0 3.0 -0.8 7.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.9 17.4 33.1 0.0 0.0 0.0 0.0 52.4 HEATING DEG. DAYS(BASE 18 0C) 670.1 695.3 595.1 315.6 194.7 48.3 14.2 4.4 133.4 215.7 449.4 583.7 3920.0 DEWPOINT (MEAN C) -9.4 -12.1 -7.0 -2.7 3.3 6.1 9.2 7.8 4.4 2.1 -1.1 -4.0 -0.3 MIXING RATIO (G/KG) 2.49 2.11 2.95 3.99 6.09 7.42 9.18 8.42 6.52 5.50 4.38 3.62 5.22 VAPOUR PRESSURE (HPA) 3.26 2.77 3.85 5.21 7.96 9.65 11.89 10.94 8.53 7.21 5.75 4.74 6.81 SATURATION DEF. (HPA) 1.85 1.40 2.15 6.19 7.15 11.51 11.39 15.58 8.08 6.74 1.72 1.09 6.24 RELATIVE HUMIDITY (MEAN %) 69 70 68 54 59 52 57 49 62 61 81 84 64 RELATIVE HUMIDITY (MAX. %) 87 87 87 83 87 79 77 72 90 89 97 96 86 RELATIVE HUMIDITY (MIN. %) 47 49 49 30 36 30 40 30 34 34 59 66 42 RELATIVE HUMIDITY (MEAN% 03UTC) 82 80 82 78 79 73 71 68 88 85 93 91 81 RELATIVE HUMIDITY (MEAN% 09UTC) 54 53 55 37 41 36 45 33 39 39 64 71 47 RELATIVE HUMIDITY (MEAN% 15UTC) 62 63 61 40 47 41 51 40 48 47 80 80 55 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 41.2 10.9 31.2 27.4 55.7 25.6 32.0 0.0 10.6 18.1 40.7 20.4 313.8 DAYS WITH PRECIPITATION >=10 1 0 1 0 2 0 2 0 0 1 1 1 9 DAYS WITH PRECIPITATION >= 5 3 0 3 3 4 2 2 0 1 1 4 2 25 DAYS WITH PRECIPITATION >= 1 5 6 6 6 10 10 2 0 2 3 9 4 63 DAYS WITH PRECIPITATION 9 9 15 12 15 12 2 0 4 4 10 8 100 GREATEST DAILY PRECIPITATION 20.0 3.0 11.0 8.4 24.6 5.0 18.0 0.0 9.0 13.0 10.0 10.0 24.6 DAY 27 24 7 17 4 11 5 ** 14 21 6 9 DAY WITH THUNDER STORM 0 0 0 1 12 13 4 0 0 0 0 0 30 DAYS WITH SNOW OR SLEET 9 9 13 2 0 0 0 0 0 1 5 7 46 DAYS WITH DUST 0 0 0 0 1 0 0 0 0 0 0 0 1 WIND DIRECTION (PREVAILING) 270 135 270 270 90 90 90 90 90 270 225 270 90 PREVAILING WIND SPEED(KNOTS) 7.6 9.2 6.4 8.8 7.9 7.9 8.4 9.2 8.4 8.4 6.6 6.8 8.9 PREVAILING WIND PERCENT 15.3 7.1 12.9 27.1 10.9 15.8 35.5 25.4 18.8 12.9 2.9 6.0 10.7 CALMS PERCENT OF WIND 66.5 71.9 59.7 54.6 58.1 55.4 34.3 45.6 56.7 74.6 89.2 80.6 62.2 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 247 139 220 253 185 132 107 111 123 254 213 207 160 VECTOR WIND MAGNITUDE(KNOTS) 1.0 0.8 1.8 3.6 1.0 1.2 4.5 3.9 1.4 1.3 0.2 0.5 0.9 WIND STEADINESES (MEAN %) 38.5 29.6 52.9 85.7 30.3 35.3 83.3 81.3 41.2 61.9 28.6 31.3 29.0 WIND SPEED (MEAN KNOTS) 2.6 2.7 3.4 4.2 3.3 3.4 5.4 4.8 3.4 2.1 0.7 1.6 3.1 FASTEST WIND DIRECTION 280 100 70 210 250 70 80 120 240 210 280 120 210 FASTEST WIND SPEED (KNOTS) 23 27 27 31 17 23 17 17 23 23 12 23 31 DAY 6 5 13 9 3 30 2 25 1 2 3 17 DAYS WITH SKY CLEAR (0-2)/8 13 14 6 3 10 17 23 26 20 16 10 6 164 DAYS WITH P.CLOUDY (3-6)/8 12 10 11 18 17 11 6 5 9 11 9 17 136 DAYS WITH CLOUDY (7-8)/8 6 4 14 9 4 2 2 0 1 4 11 8 65 DAYS WITH VISIBILITY =< 2 KM 2 2 2 0 0 0 0 0 0 0 0 0 6 DURATION OF SUNSHINE HOURS 151.0 181.0 167.8 211.9 270.0 326.6 356.7 349.8 313.2 248.4 141.1 111.0 2828.5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 818.9 819.1 815.6 817.6 821.7 819.1 818.2 819.7 822.6 823.3 823.5 820.2 820.0 MAX. QFE PRESSURE IN HPA 826.5 825.8 828.2 825.1 827.8 823.8 824.2 824.5 828.2 829.3 833.8 827.4 833.8 DAY-HOUR 23-18 16-21 11- 6 23- 6 11-18 8- 3 19- 6 21- 6 14-18 9- 6 8- 6 28- 6 MIN. QFE PRESSURE IN HPA 808.4 810.9 806.6 806.9 811.5 813.2 813.1 813.0 815.1 817.4 818.5 810.3 806.6 DAY-HOUR 15-21 5- 9 6-12 9-12 4-15 24-15 16-15 14-15 2-12 6-15 4-21 9-12 MEAN QNH PRESSURE IN HPA 1017.3 1017.5 1013.4 1015.7 1020.6 1017.5 1016.4 1018.3 1021.7 1022.5 1022.7 1018.8 1018.5 MAX. QNH PRESSURE IN HPA 1026.3 1025.5 1028.4 1024.7 1027.9 1023.1 1023.6 1024.0 1028.4 1029.7 1035.0 1027.4 1035.0 DAY-HOUR 23-18 16-21 11- 6 23- 6 11-18 8- 3 19- 6 21- 6 14-18 9- 6 8- 6 28- 6 MIN. QNH PRESSURE IN HPA 1004.8 1007.7 1002.6 1003.0 1008.5 1010.5 1010.4 1010.2 1012.7 1015.5 1016.8 1007.0 1002.6 DAY-HOUR 15-21 5- 9 6-12 9-12 4-15 24-15 16-15 14-15 2-12 6-15 4-21 9-12 MEAN QFF PRESSURE IN HPA 1023.1 1026.2 1016.9 1012.3 1013.5 1006.3 1003.8 1004.6 1013.8 1016.6 1023.6 1022.4 1015.3 MAX. QFF PRESSURE IN HPA 1040.5 1045.7 1040.9 1024.7 1025.2 1013.4 1013.0 1015.0 1026.0 1026.1 1037.5 1037.6 1045.7 DAY-HOUR 29- 3 7- 6 11- 3 14- 3 12- 3 8- 0 19- 6 21- 6 15- 3 31-21 8- 6 28- 6 MIN. QFF PRESSURE IN HPA 1003.8 1011.0 1002.2 999.9 1000.8 998.3 995.3 995.9 998.7 1004.5 1013.1 1006.2 995.3 DAY-HOUR 15-21 22-12 6-12 9- 9 4- 0 25-15 29-12 5- 6 2- 9 2-12 4-21 9-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 819.0 818.9 815.4 817.8 821.6 819.1 818.1 819.9 822.7 823.3 823.4 820.2 819.9 MAX. QFE PRESSURE IN HPA 826.1 825.5 827.2 823.9 827.3 823.3 822.7 823.7 827.4 827.9 831.4 826.0 831.4 DAY 24 17 11 24 12 8 19 21 15 9 8 29 MIN. QFE PRESSURE IN HPA 809.0 813.1 806.8 809.2 813.0 815.4 814.0 814.9 817.9 819.9 818.5 811.2 806.8 DAY 16 5 7 10 4 25 16 5 2 2 5 10 MEAN QNH PRESSURE IN HPA 1017.4 1017.2 1013.0 1016.0 1020.5 1017.5 1016.3 1018.5 1021.9 1022.5 1022.7 1018.8 1018.5 MAX. QNH PRESSURE IN HPA 1025.9 1025.1 1027.2 1023.2 1027.3 1022.5 1021.8 1023.0 1027.4 1028.0 1032.2 1025.7 1032.2 DAY 24 17 11 24 12 8 19 21 15 9 8 29 MIN. QNH PRESSURE IN HPA 1005.5 1010.4 1002.8 1005.7 1010.2 1013.1 1011.4 1012.5 1016.1 1018.5 1016.8 1008.1 1002.8 DAY 16 5 7 10 4 25 16 5 2 2 5 10 MEAN QFF PRESSURE IN HPA 1022.3 1025.5 1016.3 1012.5 1013.9 1006.6 1003.6 1004.5 1013.4 1015.9 1022.8 1021.7 1014.9 MAX. QFF PRESSURE IN HPA 1038.3 1040.5 1039.0 1023.7 1024.0 1013.4 1010.7 1013.2 1024.6 1022.5 1034.6 1033.5 1040.5 DAY 29 7 11 14 12 8 20 21 15 8 8 28 MIN. QFF PRESSURE IN HPA 1005.9 1011.1 1004.7 1000.8 1000.8 999.9 996.6 996.5 1002.0 1007.8 1013.3 1007.0 996.5 DAY 16 23 29 5 4 30 11 5 3 3 5 10 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 818.9 819.0 815.7 817.9 822.0 819.6 818.5 820.2 823.0 823.5 823.5 820.1 820.2 MAX. QFE PRESSURE IN HPA 825.7 825.3 827.7 824.9 827.4 823.8 822.7 824.0 827.5 828.5 831.6 826.0 831.6 DAY 24 17 11 24 12 8 19 21 15 9 8 29 MIN. QFE PRESSURE IN HPA 810.6 812.3 807.4 809.2 813.3 815.6 815.0 814.9 817.3 819.4 818.8 811.2 807.4 DAY 16 5 7 10 4 24 16 5 2 2 5 10 MEAN QNH PRESSURE IN HPA 1017.3 1017.4 1013.4 1016.1 1020.9 1018.1 1016.8 1018.9 1022.2 1022.7 1022.8 1018.7 1018.8 MAX. QNH PRESSURE IN HPA 1025.4 1024.9 1027.8 1024.4 1027.4 1023.1 1021.8 1023.4 1027.5 1028.7 1032.4 1025.7 1032.4 DAY 24 17 11 24 12 8 19 21 15 9 8 29 MIN. QNH PRESSURE IN HPA 1007.4 1009.4 1003.6 1005.7 1010.6 1013.3 1012.6 1012.5 1015.4 1017.9 1017.2 1008.1 1003.6 DAY 16 5 7 10 4 24 16 5 2 2 5 10 MEAN QFF PRESSURE IN HPA 1024.1 1027.3 1018.0 1013.5 1014.9 1007.6 1004.9 1006.4 1015.4 1017.9 1024.9 1022.8 1016.5 MAX. QFF PRESSURE IN HPA 1040.5 1044.2 1040.9 1024.7 1025.2 1013.4 1011.7 1014.9 1026.0 1025.4 1036.8 1036.1 1044.2 DAY 29 7 11 14 12 8 8 21 15 9 8 28 MIN. QFF PRESSURE IN HPA 1011.1 1011.8 1006.1 1003.2 1001.3 1000.8 998.5 998.6 1003.9 1008.8 1014.0 1007.9 998.5 DAY 16 22 6 5 4 30 11 5 3 2 5 9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 819.7 819.9 816.3 818.2 822.0 819.6 818.8 820.5 823.4 824.3 824.3 820.9 820.6 MAX. QFE PRESSURE IN HPA 826.1 825.5 828.2 825.1 827.1 823.4 824.2 824.5 828.2 829.3 833.8 827.4 833.8 DAY 24 17 11 23 12 8 19 21 19 9 8 28 MIN. QFE PRESSURE IN HPA 809.9 812.3 807.4 809.2 812.6 815.4 814.7 815.0 817.5 819.7 819.4 812.1 807.4 DAY 31 5 7 10 4 25 11 5 2 2 5 10 MEAN QNH PRESSURE IN HPA 1018.2 1018.4 1014.1 1016.5 1021.0 1018.1 1017.1 1019.2 1022.6 1023.7 1023.7 1019.7 1019.4 MAX. QNH PRESSURE IN HPA 1025.9 1025.1 1028.4 1024.7 1027.1 1022.6 1023.6 1024.0 1028.4 1029.7 1035.0 1027.4 1035.0 DAY 24 17 11 23 12 8 19 21 19 9 8 28 MIN. QNH PRESSURE IN HPA 1006.5 1009.4 1003.6 1005.7 1009.8 1013.1 1012.3 1012.6 1015.6 1018.2 1017.9 1009.2 1003.6 DAY 31 5 7 10 4 25 11 5 2 2 5 10 MEAN QFF PRESSURE IN HPA 1024.9 1027.7 1017.9 1012.8 1013.2 1006.5 1004.5 1005.5 1014.6 1017.7 1025.2 1024.0 1016.2 MAX. QFF PRESSURE IN HPA 1040.1 1045.7 1038.7 1022.7 1020.8 1011.6 1013.0 1015.0 1024.3 1025.8 1037.5 1037.6 1045.7 DAY 29 7 11 12 15 8 19 21 14 9 8 28 MIN. QFF PRESSURE IN HPA 1011.7 1012.1 1005.5 1002.8 1001.7 999.8 997.6 995.9 1001.1 1010.8 1013.8 1007.1 995.9 DAY 16 22 29 9 4 26 11 5 2 2 5 9 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 819.0 819.4 815.9 817.6 821.7 819.2 818.3 819.8 822.7 823.5 823.6 820.2 820.1 MAX. QFE PRESSURE IN HPA 825.9 825.1 827.6 824.7 826.7 823.1 823.8 824.0 827.6 829.3 832.4 826.8 832.4 DAY 23 7 11 23 11 8 19 24 14 9 8 28 MIN. QFE PRESSURE IN HPA 808.4 810.9 808.4 807.4 812.4 815.0 814.2 814.7 816.0 818.9 819.7 811.8 807.4 DAY 31 5 6 9 4 24 16 5 2 2 5 10 MEAN QNH PRESSURE IN HPA 1017.4 1017.8 1013.6 1015.8 1020.6 1017.6 1016.5 1018.3 1021.8 1022.8 1022.9 1018.8 1018.7 MAX. QNH PRESSURE IN HPA 1025.6 1024.7 1027.6 1024.2 1026.6 1022.3 1023.1 1023.4 1027.6 1029.7 1033.4 1026.7 1033.4 DAY 23 7 11 23 11 8 19 24 14 9 8 28 MIN. QNH PRESSURE IN HPA 1004.8 1007.7 1004.8 1003.6 1009.5 1012.6 1011.7 1012.3 1013.8 1017.3 1018.2 1008.8 1003.6 DAY 31 5 6 9 4 24 16 5 2 2 5 10 MEAN QFF PRESSURE IN HPA 1022.1 1025.3 1016.7 1012.0 1012.9 1006.0 1003.4 1004.0 1013.0 1016.1 1022.8 1021.8 1014.7 MAX. QFF PRESSURE IN HPA 1034.1 1042.9 1036.4 1021.4 1020.4 1011.7 1012.9 1013.2 1024.3 1023.6 1034.9 1034.6 1042.9 DAY 19 7 10 12 11 8 19 21 14 9 8 28 MIN. QFF PRESSURE IN HPA 1011.6 1011.5 1004.1 999.9 1002.7 999.9 997.6 996.2 998.7 1009.5 1013.9 1007.9 996.2 DAY 26 22 25 9 4 30 11 5 2 2 5 10 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 818.2 818.6 815.0 816.9 821.0 818.6 817.5 818.8 821.8 822.5 822.8 819.6 819.3 MAX. QFE PRESSURE IN HPA 825.4 824.3 826.5 823.6 826.7 822.7 823.4 823.3 827.8 827.9 831.8 825.8 831.8 DAY 23 7 11 23 11 8 19 24 14 9 7 28 MIN. QFE PRESSURE IN HPA 808.6 812.8 806.6 806.9 812.3 814.5 813.2 813.6 815.1 817.5 819.7 810.3 806.6 DAY 31 22 6 9 4 24 16 14 2 6 17 9 MEAN QNH PRESSURE IN HPA 1016.4 1016.9 1012.7 1014.9 1019.8 1016.9 1015.5 1017.2 1020.7 1021.6 1021.9 1018.1 1017.7 MAX. QNH PRESSURE IN HPA 1025.0 1023.7 1026.3 1022.9 1026.6 1021.8 1022.6 1022.5 1027.9 1028.0 1032.7 1025.5 1032.7 DAY 23 7 11 23 11 8 19 24 14 9 7 28 MIN. QNH PRESSURE IN HPA 1005.0 1010.0 1002.6 1003.0 1009.4 1012.0 1010.5 1011.0 1012.7 1015.6 1018.2 1007.0 1002.6 DAY 31 22 6 9 4 24 16 14 2 6 17 9 MEAN QFF PRESSURE IN HPA 1021.5 1024.9 1015.7 1011.4 1013.1 1006.1 1002.7 1003.0 1012.4 1015.2 1021.9 1020.9 1014.0 MAX. QFF PRESSURE IN HPA 1033.9 1041.7 1036.4 1020.4 1019.9 1011.8 1012.3 1011.6 1023.9 1023.0 1033.0 1033.1 1041.7 DAY 19 7 11 12 8 8 19 21 14 31 7 28 MIN. QFF PRESSURE IN HPA 1010.3 1011.0 1002.2 1000.6 1003.5 999.0 995.3 996.1 998.9 1004.5 1014.5 1006.2 995.3 DAY 26 22 6 5 4 25 29 5 2 2 5 9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 818.6 818.7 815.3 816.8 821.0 818.2 817.3 818.6 821.8 822.6 823.2 820.1 819.3 MAX. QFE PRESSURE IN HPA 826.0 824.5 826.3 823.6 826.8 821.9 823.1 823.2 827.8 827.7 832.2 825.7 832.2 DAY 23 7 11 23 11 18 19 24 14 9 7 28 MIN. QFE PRESSURE IN HPA 810.5 813.2 807.8 808.2 811.5 813.2 813.1 813.0 815.1 817.4 819.9 811.1 807.8 DAY 26 22 6 5 4 24 16 14 2 6 30 9 MEAN QNH PRESSURE IN HPA 1016.9 1017.0 1012.9 1014.8 1019.8 1016.5 1015.4 1017.0 1020.7 1021.7 1022.4 1018.7 1017.8 MAX. QNH PRESSURE IN HPA 1025.7 1024.0 1026.1 1022.9 1026.7 1020.9 1022.3 1022.4 1027.9 1027.8 1033.1 1025.4 1033.1 DAY 23 7 11 23 11 18 19 24 14 9 7 28 MIN. QNH PRESSURE IN HPA 1007.3 1010.5 1004.0 1004.5 1008.5 1010.5 1010.4 1010.2 1012.7 1015.5 1018.5 1008.0 1004.0 DAY 26 22 6 5 4 24 16 14 2 6 30 9 MEAN QFF PRESSURE IN HPA 1023.8 1026.7 1017.2 1012.1 1013.6 1005.9 1003.3 1004.3 1014.0 1017.0 1024.4 1022.8 1015.4 MAX. QFF PRESSURE IN HPA 1036.6 1044.0 1039.3 1020.5 1021.0 1012.7 1012.6 1013.0 1024.2 1024.8 1035.1 1035.2 1044.0 DAY 19 7 10 12 12 18 19 21 14 31 7 28 MIN. QFF PRESSURE IN HPA 1009.9 1011.6 1003.6 1003.1 1002.5 998.3 995.4 996.6 1001.8 1005.5 1016.7 1006.7 995.4 DAY 15 22 19 5 4 25 29 14 2 2 3 9 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 819.0 819.3 815.9 817.8 822.1 819.2 818.6 820.0 823.0 823.5 823.5 820.4 820.2 MAX. QFE PRESSURE IN HPA 826.5 825.4 826.9 823.9 827.8 822.7 823.3 824.1 828.2 828.6 832.8 826.2 832.8 DAY 23 16 11 23 11 7 19 24 14 9 7 28 MIN. QFE PRESSURE IN HPA 810.3 813.5 808.3 808.6 811.8 815.2 813.9 815.3 816.4 819.0 819.1 811.4 808.3 DAY 15 22 28 9 4 25 15 5 2 6 4 9 MEAN QNH PRESSURE IN HPA 1017.4 1017.7 1013.7 1015.9 1021.1 1017.6 1016.9 1018.6 1022.1 1022.7 1022.8 1019.0 1018.8 MAX. QNH PRESSURE IN HPA 1026.3 1025.0 1026.8 1023.2 1027.9 1021.8 1022.5 1023.5 1028.4 1028.8 1033.8 1026.0 1033.8 DAY 23 16 11 23 11 7 19 24 14 9 7 28 MIN. QNH PRESSURE IN HPA 1007.0 1010.8 1004.6 1005.0 1008.8 1012.9 1011.3 1013.0 1014.3 1017.4 1017.5 1008.3 1004.6 DAY 15 22 28 9 4 25 15 5 2 6 4 9 MEAN QFF PRESSURE IN HPA 1024.2 1026.9 1017.3 1012.1 1013.3 1005.9 1004.2 1004.9 1014.1 1016.8 1024.3 1023.4 1015.6 MAX. QFF PRESSURE IN HPA 1038.0 1044.1 1037.9 1022.0 1021.6 1012.4 1012.3 1013.8 1025.7 1026.0 1035.4 1035.8 1044.1 DAY 18 7 10 12 11 3 19 20 14 31 7 28 MIN. QFF PRESSURE IN HPA 1007.1 1011.6 1004.6 1003.6 1003.4 999.8 997.9 996.7 1000.1 1006.0 1014.3 1007.0 996.7 DAY 15 22 28 9 4 25 15 14 2 2 4 9 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 818.9 819.3 815.7 817.9 822.2 819.4 818.6 820.1 822.9 823.6 823.5 820.3 820.2 MAX. QFE PRESSURE IN HPA 826.5 825.8 826.9 823.9 827.3 823.3 823.3 824.1 828.0 828.3 832.6 825.6 832.6 DAY 23 16 10 23 11 7 19 24 14 8 7 27 MIN. QFE PRESSURE IN HPA 808.4 813.5 808.3 809.0 813.4 815.4 814.3 815.3 817.8 819.3 818.5 811.8 808.3 DAY 15 4 6 9 4 24 15 4 2 2 4 9 MEAN QNH PRESSURE IN HPA 1017.3 1017.7 1013.5 1016.1 1021.2 1017.9 1016.9 1018.7 1022.1 1022.8 1022.7 1019.0 1018.8 MAX. QNH PRESSURE IN HPA 1026.3 1025.5 1026.8 1023.2 1027.3 1022.5 1022.5 1023.5 1028.1 1028.5 1033.6 1025.3 1033.6 DAY 23 16 10 23 11 7 19 24 14 8 7 27 MIN. QNH PRESSURE IN HPA 1004.8 1010.8 1004.6 1005.5 1010.7 1013.1 1011.8 1013.0 1016.0 1017.8 1016.8 1008.8 1004.6 DAY 15 4 6 9 4 24 15 4 2 2 4 9 MEAN QFF PRESSURE IN HPA 1022.3 1025.1 1016.4 1012.1 1013.4 1006.2 1003.9 1004.5 1013.3 1016.3 1022.8 1022.0 1014.9 MAX. QFF PRESSURE IN HPA 1036.9 1039.9 1037.6 1023.3 1022.5 1012.7 1012.2 1013.9 1025.4 1026.1 1036.1 1032.8 1039.9 DAY 28 7 10 12 11 7 19 20 14 31 7 27 MIN. QFF PRESSURE IN HPA 1003.8 1011.1 1004.2 1002.3 1002.9 999.8 996.2 997.0 1001.1 1005.4 1013.1 1008.1 996.2 DAY 15 22 28 27 3 29 10 4 1 2 4 9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -6.4 -5.4 1.7 8.7 12.5 18.4 18.9 20.1 18.0 11.6 8.1 3.8 9.2 MINIMUN AIR TEMPERATURE (C) -11.4 -10.6 -3.1 1.9 5.5 10.9 12.9 12.9 8.7 1.1 -0.0 -3.3 2.1 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 1 0 0 0 0 0 1 DAYS WITH MINIMUM TEMP. <=-4 28 22 11 2 0 0 0 0 0 1 2 15 81 DAYS WITH FREEZING MIN.<= 0 31 26 22 10 3 0 0 0 0 14 15 26 147 TEMPERATURE RECORDS LOWEST(C) -22.5 -22.5 -15.4 -4.8 -2.4 7.2 3.2 8.4 2.0 -4.0 -4.5 -10.0 -22.5 DAY 10 17 2 7 4 4 26 23 29 13 6 20 MAXIMUM AIR TEMPERATURE (C) -0.9 -0.1 6.8 15.5 19.3 25.2 24.7 27.3 23.4 17.7 13.0 8.9 15.1 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 1 4 10 2 0 0 0 17 DAYS WITH MAXIMUM TEMP. <= 0 21 15 2 0 0 0 0 0 0 0 0 0 38 TEMPERATURE RECORDS HIGHEST(C) 1.8 8.0 15.0 23.8 26.0 30.2 30.6 34.8 33.6 24.2 17.0 17.0 34.8 DAY 26 24 28 15 28 22 10 30 1 1 1 10 DIF. BETWEEN (MAX.-MIN.) (C) 10.5 10.5 9.9 13.6 13.8 14.3 11.8 14.4 14.7 16.6 13.0 12.2 13.0 MEAN DAILY TEMP. (MDT) (C) -6.1 -5.3 1.9 8.7 12.4 18.0 18.8 20.1 16.1 9.4 6.5 2.8 8.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.7 3.9 18.7 3.8 0.0 0.0 0.0 27.1 HEATING DEG. DAYS(BASE 18 0C) 747.8 652.9 499.8 278.3 174.2 20.9 11.2 4.5 71.4 267.5 344.7 470.9 3544.2 DEWPOINT (MEAN C) -8.0 -7.7 -2.2 1.8 5.6 8.4 9.3 10.0 6.7 1.6 0.4 -3.0 1.9 MIXING RATIO (G/KG) 2.75 2.80 4.16 5.45 7.15 8.60 9.27 9.64 7.65 5.34 4.86 3.82 5.96 VAPOUR PRESSURE (HPA) 3.59 3.67 5.42 7.11 9.33 11.21 12.03 12.54 9.98 7.01 6.39 5.02 7.77 SATURATION DEF. (HPA) 0.46 0.75 1.91 5.07 6.12 10.84 10.65 12.32 12.05 7.92 4.98 3.63 6.39 RELATIVE HUMIDITY (MEAN %) 89 86 78 67 66 56 57 57 53 57 63 67 66 RELATIVE HUMIDITY (MAX. %) 96 96 94 92 93 81 80 82 86 90 86 88 89 RELATIVE HUMIDITY (MIN. %) 77 71 60 42 44 36 39 36 37 38 46 49 48 RELATIVE HUMIDITY (MEAN% 03UTC) 94 94 89 89 89 71 68 78 86 89 84 87 85 RELATIVE HUMIDITY (MEAN% 09UTC) 84 75 68 48 49 39 44 41 41 41 50 53 53 RELATIVE HUMIDITY (MEAN% 15UTC) 87 80 70 54 55 50 56 47 51 55 63 68 61 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 27.3 22.3 65.1 69.1 66.4 2.0 26.0 0.0 0.2 6.0 23.4 4.7 312.5 DAYS WITH PRECIPITATION >=10 0 1 2 1 2 0 1 0 0 0 1 0 8 DAYS WITH PRECIPITATION >= 5 2 1 5 6 5 0 2 0 0 0 1 0 22 DAYS WITH PRECIPITATION >= 1 6 7 8 11 7 1 5 0 0 2 3 2 52 DAYS WITH PRECIPITATION 15 10 10 13 12 1 6 0 3 4 6 5 85 GREATEST DAILY PRECIPITATION 8.6 11.2 17.0 20.0 28.3 2.0 12.0 0.0 0.2 3.0 19.0 2.3 28.3 DAY 6 7 30 28 29 8 2 ** 25 9 11 27 DAY WITH THUNDER STORM 0 0 0 3 7 1 4 1 1 0 0 0 17 DAYS WITH SNOW OR SLEET 14 11 7 3 0 0 0 0 0 0 0 3 38 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 135 90 270 270 135 90 90 90 90 90 270 225 90 PREVAILING WIND SPEED(KNOTS) 8.6 9.8 10.1 7.4 8.5 8.7 8.1 6.5 6.8 7.9 7.1 10.2 8.2 PREVAILING WIND PERCENT 4.0 14.3 14.5 8.8 9.7 30.0 30.6 19.6 21.3 18.1 14.7 14.2 13.7 CALMS PERCENT OF WIND 87.1 73.7 68.1 76.7 62.9 48.8 52.8 70.8 60.0 65.2 68.7 61.3 66.7 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 240 150 155 150 155 2546 VECTOR WIND DIRECTION (MEAN) 155 106 249 240 169 103 105 101 112 112 235 221 135 VECTOR WIND MAGNITUDE(KNOTS) 0.6 1.0 2.5 1.0 0.8 3.6 3.1 1.7 1.5 1.2 0.8 1.3 0.9 WIND STEADINESES (MEAN %) 50.0 41.7 83.3 50.0 27.6 83.7 83.8 89.5 53.6 44.4 32.0 38.2 33.3 WIND SPEED (MEAN KNOTS) 1.2 2.4 3.0 2.0 2.9 4.3 3.7 1.9 2.8 2.7 2.5 3.4 2.7 FASTEST WIND DIRECTION 70 110 240 270 270 280 110 120 100 100 100 240 240 FASTEST WIND SPEED (KNOTS) 23 19 27 27 21 23 23 14 16 16 16 17 27 DAY 9 19 19 18 12 3 1 18 8 8 9 11 DAYS WITH SKY CLEAR (0-2)/8 6 7 10 9 10 25 23 26 22 19 17 15 189 DAYS WITH P.CLOUDY (3-6)/8 12 10 8 12 18 5 7 5 8 8 9 10 112 DAYS WITH CLOUDY (7-8)/8 13 11 13 9 3 0 1 0 0 4 4 6 64 DAYS WITH VISIBILITY =< 2 KM 3 2 0 0 0 0 0 0 0 1 2 0 8 DURATION OF SUNSHINE HOURS 97.6 136.2 180.2 225.4 290.4 361.8 348.8 350.5 305.4 256.4 191.5 165.3 2909.5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 817.8 819.1 817.4 820.1 821.4 822.3 819.8 822.0 821.9 824.9 823.9 823.9 821.2 MAX. QFE PRESSURE IN HPA 826.9 831.7 825.1 831.1 829.5 828.3 827.3 826.0 827.0 832.4 830.4 831.0 832.4 DAY-HOUR 22- 6 22-21 26- 6 12- 6 8- 6 16-18 20- 9 25- 3 27- 6 9- 9 21- 6 29- 6 MIN. QFE PRESSURE IN HPA 807.0 806.2 807.2 811.7 813.2 817.3 810.2 817.6 816.6 816.9 816.2 817.2 806.2 DAY-HOUR 13- 0 8- 3 18-15 21-12 21-15 26-15 5-15 16-12 5-15 1-15 10-12 21- 3 MEAN QNH PRESSURE IN HPA 1016.0 1017.5 1015.5 1018.7 1020.3 1021.3 1018.3 1021.0 1020.9 1024.5 1023.2 1023.2 1020.0 MAX. QNH PRESSURE IN HPA 1026.8 1032.5 1024.7 1031.8 1029.9 1028.5 1027.3 1025.7 1026.9 1033.4 1031.0 1031.7 1033.4 DAY-HOUR 22- 6 22-21 26- 6 12- 6 8- 6 16-18 20- 9 25- 3 27- 6 9- 9 21- 6 29- 6 MIN. QNH PRESSURE IN HPA 1003.1 1002.1 1003.3 1008.7 1010.5 1015.4 1006.9 1015.7 1014.5 1014.9 1014.1 1015.2 1002.1 DAY-HOUR 13- 0 8- 3 18-15 21-12 21-15 26-15 5-15 16-12 5-15 1-15 10-12 21- 3 MEAN QFF PRESSURE IN HPA 1023.8 1024.5 1016.5 1014.2 1012.9 1009.5 1006.0 1008.1 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1039.4 1041.9 1030.0 1027.9 1025.9 1017.6 1015.8 1014.6 ****** ****** ****** ****** ****** DAY-HOUR 22- 6 22- 6 3-15 12- 3 4- 3 17- 3 20- 6 4- 3 **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA 1007.5 1002.1 1001.2 1003.0 1000.9 1001.2 992.1 999.7 ****** ****** ****** ****** ****** DAY-HOUR 30- 0 8- 3 29-12 21-15 20-21 24- 6 5-15 20-12 **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 817.6 818.8 817.3 819.9 821.4 822.1 819.8 822.1 ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 824.5 830.7 824.8 829.8 827.8 827.7 826.1 825.2 ****** ****** ****** ****** ****** DAY 22 23 28 12 8 17 20 25 ** ** ** ** MIN. QFE PRESSURE IN HPA 807.0 807.3 809.2 812.0 814.0 817.9 813.5 818.5 ****** ****** ****** ****** ****** DAY 13 14 19 22 21 1 6 13 ** ** ** ** MEAN QNH PRESSURE IN HPA 1015.7 1017.2 1015.4 1018.5 1020.2 1021.1 1018.3 1021.1 ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1024.0 1031.3 1024.3 1030.3 1027.9 1027.8 1025.9 1024.8 ****** ****** ****** ****** ****** DAY 22 23 28 12 8 17 20 25 ** ** ** ** MIN. QNH PRESSURE IN HPA 1003.1 1003.4 1005.7 1009.0 1011.4 1016.1 1010.8 1016.8 ****** ****** ****** ****** ****** DAY 13 14 19 22 21 1 6 13 ** ** ** ** MEAN QFF PRESSURE IN HPA 1022.7 1023.6 1016.3 1013.9 1013.1 1009.5 1006.1 1008.0 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1032.8 1040.7 1025.8 1025.8 1025.3 1016.5 1014.7 1013.3 ****** ****** ****** ****** ****** DAY 22 23 5 12 4 17 21 4 ** ** ** ** MIN. QFF PRESSURE IN HPA 1007.5 1002.3 1001.7 1003.1 1001.4 1002.9 996.8 1002.2 ****** ****** ****** ****** ****** DAY 30 8 30 21 21 24 6 13 ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 817.5 818.8 817.4 820.2 821.7 822.7 820.0 822.5 822.5 825.2 824.1 824.0 821.4 MAX. QFE PRESSURE IN HPA 825.0 830.3 824.3 830.7 828.4 828.1 826.8 826.0 826.6 830.8 829.6 830.0 830.8 DAY 22 23 26 12 9 17 20 25 27 9 21 29 MIN. QFE PRESSURE IN HPA 807.7 806.2 809.5 812.9 814.2 818.9 813.5 819.2 819.0 819.4 817.9 817.2 806.2 DAY 13 8 30 22 21 1 5 13 5 1 10 21 MEAN QNH PRESSURE IN HPA 1015.6 1017.2 1015.5 1018.8 1020.6 1021.8 1018.6 1021.5 1021.6 1024.8 1023.5 1023.4 1020.2 MAX. QNH PRESSURE IN HPA 1024.5 1030.9 1023.7 1031.3 1028.6 1028.2 1026.7 1025.7 1026.5 1031.5 1030.0 1030.5 1031.5 DAY 22 23 26 12 9 17 20 25 27 9 21 29 MIN. QNH PRESSURE IN HPA 1003.9 1002.1 1006.1 1010.1 1011.7 1017.3 1010.8 1017.6 1017.4 1017.9 1016.1 1015.2 1002.1 DAY 13 8 30 22 21 1 5 13 5 1 10 21 MEAN QFF PRESSURE IN HPA 1024.2 1025.0 1017.3 1015.4 1014.3 1010.9 1007.3 1009.6 1013.0 1021.8 1022.1 1025.2 1017.2 MAX. QFF PRESSURE IN HPA 1035.8 1041.9 1028.2 1027.9 1025.9 1017.6 1015.8 1014.6 1022.3 1032.1 1029.4 1037.5 1041.9 DAY 22 23 26 12 4 17 20 4 29 9 21 29 MIN. QFF PRESSURE IN HPA 1009.0 1002.1 1002.9 1004.9 1001.8 1004.7 998.1 1003.3 1003.8 1009.0 1011.6 1013.4 998.1 DAY 30 8 30 21 21 24 6 13 3 2 11 21 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 818.4 819.6 818.0 820.7 822.0 822.9 820.2 822.7 822.8 825.9 824.9 824.7 821.9 MAX. QFE PRESSURE IN HPA 826.9 830.9 825.1 831.1 829.5 828.1 827.2 826.0 827.0 832.2 830.4 831.0 832.2 DAY 22 23 26 12 8 17 20 25 27 9 21 29 MIN. QFE PRESSURE IN HPA 809.5 807.9 809.5 813.6 814.0 818.5 813.2 819.5 819.3 819.6 818.0 818.6 807.9 DAY 13 8 30 23 21 24 5 23 5 1 10 24 MEAN QNH PRESSURE IN HPA 1016.7 1018.1 1016.2 1019.4 1021.0 1022.0 1018.9 1021.9 1021.9 1025.6 1024.4 1024.2 1020.9 MAX. QNH PRESSURE IN HPA 1026.8 1031.6 1024.7 1031.8 1029.9 1028.2 1027.2 1025.7 1026.9 1033.1 1031.0 1031.7 1033.1 DAY 22 23 26 12 8 17 20 25 27 9 21 29 MIN. QNH PRESSURE IN HPA 1006.1 1004.2 1006.1 1011.0 1011.4 1016.8 1010.5 1018.0 1017.8 1018.1 1016.2 1016.9 1004.2 DAY 13 8 30 23 21 24 5 23 5 1 10 24 MEAN QFF PRESSURE IN HPA 1025.4 1025.8 1017.3 1014.7 1013.1 1009.8 1006.2 1009.0 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1039.4 1041.9 1027.1 1025.4 1024.1 1017.4 1015.8 1012.8 ****** ****** ****** ****** ****** DAY 22 22 26 12 2 17 20 3 ** ** ** ** MIN. QFF PRESSURE IN HPA 1008.7 1003.8 1003.4 1004.6 1001.1 1001.2 996.3 1003.8 ****** ****** ****** ****** ****** DAY 30 8 17 18 21 24 6 20 ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 818.1 819.4 817.5 820.5 821.5 822.6 819.9 822.2 822.0 825.1 823.9 823.8 821.4 MAX. QFE PRESSURE IN HPA 826.0 831.0 824.9 830.4 828.3 827.7 827.3 824.7 826.4 832.4 829.6 830.0 832.4 DAY 22 22 26 12 8 16 20 2 27 9 21 29 MIN. QFE PRESSURE IN HPA 809.7 808.5 809.2 812.7 813.8 818.5 812.4 818.7 818.2 818.7 817.0 818.2 808.5 DAY 30 8 18 21 21 2 5 16 5 1 10 24 MEAN QNH PRESSURE IN HPA 1016.3 1017.9 1015.6 1019.1 1020.4 1021.7 1018.5 1021.2 1021.0 1024.6 1023.3 1023.1 1020.2 MAX. QNH PRESSURE IN HPA 1025.7 1031.7 1024.4 1031.0 1028.5 1027.8 1027.3 1024.2 1026.2 1033.4 1030.0 1030.5 1033.4 DAY 22 22 26 12 8 16 20 2 27 9 21 29 MIN. QNH PRESSURE IN HPA 1006.3 1004.9 1005.7 1009.9 1011.2 1016.8 1009.5 1017.0 1016.4 1017.0 1015.0 1016.4 1004.9 DAY 30 8 18 21 21 2 5 16 5 1 10 24 MEAN QFF PRESSURE IN HPA 1023.2 1024.1 1016.2 1014.3 1012.2 1009.4 1005.6 1007.8 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1036.8 1041.3 1026.2 1024.0 1023.7 1016.8 1015.4 1011.9 ****** ****** ****** ****** ****** DAY 22 22 26 12 2 16 20 8 ** ** ** ** MIN. QFF PRESSURE IN HPA 1008.9 1003.4 1002.7 1003.4 1001.0 1002.6 994.3 1001.4 ****** ****** ****** ****** ****** DAY 30 8 17 21 21 24 5 16 ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 817.4 818.4 816.6 819.4 820.9 821.8 819.2 821.2 821.1 824.2 823.1 823.2 820.6 MAX. QFE PRESSURE IN HPA 825.0 830.6 823.8 829.0 827.7 827.1 826.4 823.7 825.6 832.1 828.3 829.0 832.1 DAY 22 22 27 11 8 16 20 3 27 9 21 29 MIN. QFE PRESSURE IN HPA 809.7 807.9 807.8 811.7 813.5 817.4 811.3 817.6 816.8 817.3 816.2 817.5 807.8 DAY 30 14 18 21 21 27 5 16 5 1 10 20 MEAN QNH PRESSURE IN HPA 1015.5 1016.7 1014.5 1017.9 1019.7 1020.7 1017.6 1020.1 1019.9 1023.7 1022.3 1022.4 1019.2 MAX. QNH PRESSURE IN HPA 1024.5 1031.2 1023.1 1029.3 1027.8 1027.1 1026.2 1023.0 1025.3 1033.0 1028.5 1029.3 1033.0 DAY 22 22 27 11 8 16 20 3 27 9 21 29 MIN. QNH PRESSURE IN HPA 1006.3 1004.2 1004.0 1008.7 1010.8 1015.5 1008.2 1015.7 1014.8 1015.4 1014.1 1015.6 1004.0 DAY 30 14 18 21 21 27 5 16 5 1 10 20 MEAN QFF PRESSURE IN HPA 1022.4 1023.0 1015.2 1013.2 1012.3 1009.0 1005.1 1006.8 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1035.1 1041.0 1025.4 1024.8 1024.2 1017.3 1014.6 1010.9 ****** ****** ****** ****** ****** DAY 22 22 4 11 3 16 20 4 ** ** ** ** MIN. QFF PRESSURE IN HPA 1009.3 1002.9 1001.2 1003.0 1001.4 1002.0 994.0 999.7 ****** ****** ****** ****** ****** DAY 30 8 29 21 21 27 5 20 ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 817.7 818.9 817.0 819.5 820.7 821.6 819.0 821.1 821.2 824.4 823.4 823.8 820.7 MAX. QFE PRESSURE IN HPA 824.4 830.9 823.7 829.2 827.1 827.3 825.9 824.1 826.1 832.1 828.8 828.5 832.1 DAY 22 22 27 11 8 16 20 2 27 9 21 11 MIN. QFE PRESSURE IN HPA 808.8 807.4 807.2 811.7 813.2 817.3 810.2 818.0 816.6 816.9 817.6 817.3 807.2 DAY 12 13 18 21 21 26 5 12 5 1 10 20 MEAN QNH PRESSURE IN HPA 1015.8 1017.3 1015.0 1018.0 1019.5 1020.5 1017.4 1019.9 1020.0 1023.8 1022.7 1023.1 1019.4 MAX. QNH PRESSURE IN HPA 1023.8 1031.6 1023.0 1029.6 1027.1 1027.3 1025.6 1023.5 1025.9 1033.0 1029.1 1028.7 1033.0 DAY 22 22 27 11 8 16 20 2 27 9 21 11 MIN. QNH PRESSURE IN HPA 1005.2 1003.6 1003.3 1008.7 1010.5 1015.4 1006.9 1016.2 1014.5 1014.9 1015.7 1015.4 1003.3 DAY 12 13 18 21 21 26 5 12 5 1 10 20 MEAN QFF PRESSURE IN HPA 1024.4 1025.0 1016.6 1014.4 1012.9 1009.4 1005.8 1007.7 1011.5 1020.7 1021.2 1025.0 1016.2 MAX. QFF PRESSURE IN HPA 1035.7 1041.5 1030.0 1025.5 1025.2 1016.1 1014.8 1011.9 1019.6 1033.6 1028.9 1034.3 1041.5 DAY 22 22 3 11 3 16 20 2 27 9 23 29 MIN. QFF PRESSURE IN HPA 1010.3 1006.6 1001.5 1003.0 1001.5 1001.4 992.1 1001.5 1002.2 1007.4 1009.6 1014.5 992.1 DAY 12 8 29 21 21 26 5 12 2 1 10 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 818.1 819.3 817.8 820.2 821.6 822.3 820.1 822.2 ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 824.4 831.5 824.2 829.8 828.1 828.3 827.0 825.2 ****** ****** ****** ****** ****** DAY 22 22 27 11 8 16 19 2 ** ** ** ** MIN. QFE PRESSURE IN HPA 808.3 807.3 808.6 812.2 814.2 818.0 812.2 818.0 ****** ****** ****** ****** ****** DAY 12 13 18 21 21 2 5 12 ** ** ** ** MEAN QNH PRESSURE IN HPA 1016.3 1017.8 1016.0 1018.9 1020.5 1021.3 1018.7 1021.3 ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1023.8 1032.3 1023.6 1030.3 1028.2 1028.5 1026.9 1024.8 ****** ****** ****** ****** ****** DAY 22 22 27 11 8 16 19 2 ** ** ** ** MIN. QNH PRESSURE IN HPA 1004.6 1003.4 1005.0 1009.3 1011.7 1016.2 1009.3 1016.2 ****** ****** ****** ****** ****** DAY 12 13 18 21 21 2 5 12 ** ** ** ** MEAN QFF PRESSURE IN HPA 1025.0 1025.5 1016.9 1014.0 1012.5 1009.0 1006.0 1008.4 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1035.3 1041.4 1027.4 1025.0 1025.2 1017.4 1015.1 1013.0 ****** ****** ****** ****** ****** DAY 16 21 3 11 2 16 20 2 ** ** ** ** MIN. QFF PRESSURE IN HPA 1009.6 1006.0 1002.2 1003.1 1001.5 1002.2 994.4 1002.1 ****** ****** ****** ****** ****** DAY 12 7 29 21 20 26 5 12 ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 818.0 819.2 817.9 820.2 821.6 822.5 820.2 822.3 ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 824.1 831.7 824.2 829.8 828.4 828.3 827.2 825.1 ****** ****** ****** ****** ****** DAY 21 22 27 11 8 16 19 24 ** ** ** ** MIN. QFE PRESSURE IN HPA 807.3 807.3 809.3 812.2 814.0 818.4 812.8 818.5 ****** ****** ****** ****** ****** DAY 12 13 18 21 20 26 5 12 ** ** ** ** MEAN QNH PRESSURE IN HPA 1016.2 1017.6 1016.0 1018.8 1020.5 1021.6 1018.8 1021.4 ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1023.5 1032.5 1023.6 1030.3 1028.6 1028.5 1027.2 1024.7 ****** ****** ****** ****** ****** DAY 21 22 27 11 8 16 19 24 ** ** ** ** MIN. QNH PRESSURE IN HPA 1003.4 1003.4 1005.8 1009.3 1011.4 1016.7 1010.0 1016.8 ****** ****** ****** ****** ****** DAY 12 13 18 21 20 26 5 12 ** ** ** ** MEAN QFF PRESSURE IN HPA 1023.2 1024.1 1016.5 1013.8 1012.4 1009.4 1006.0 1008.0 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1032.8 1041.0 1025.3 1025.1 1024.4 1016.7 1015.0 1012.1 ****** ****** ****** ****** ****** DAY 21 22 4 6 2 16 20 2 ** ** ** ** MIN. QFF PRESSURE IN HPA 1008.6 1002.6 1002.1 1003.4 1000.9 1001.5 994.7 1002.2 ****** ****** ****** ****** ****** DAY 12 7 29 21 20 26 5 12 ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -1.8 1.7 4.1 9.4 15.7 20.2 19.9 23.8 17.3 12.9 2.9 1.5 10.6 MINIMUN AIR TEMPERATURE (C) -7.5 -4.5 -3.4 1.5 4.1 10.5 12.7 14.5 7.4 3.2 -3.4 -4.4 2.6 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 1 0 0 0 0 1 DAYS WITH MINIMUM TEMP. <=-4 21 18 16 1 0 0 0 0 0 0 10 15 81 DAYS WITH FREEZING MIN.<= 0 29 25 25 11 3 0 0 0 2 4 23 27 149 TEMPERATURE RECORDS LOWEST(C) -18.5 -9.6 -9.6 -4.2 -1.5 3.6 6.6 7.4 -0.6 -2.6 -18.2 -14.6 -18.5 DAY 5 1 6 7 22 3 15 30 24 14 29 2 MAXIMUM AIR TEMPERATURE (C) 2.8 6.2 8.6 14.1 21.3 24.9 23.6 28.9 23.1 18.6 7.2 6.2 15.4 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 2 4 16 0 0 0 0 22 DAYS WITH MAXIMUM TEMP. <= 0 4 1 0 0 0 0 0 0 0 0 5 1 11 TEMPERATURE RECORDS HIGHEST(C) 6.6 10.8 16.6 22.6 29.0 30.6 32.0 34.0 29.6 25.2 13.6 14.0 34.0 DAY 8 27 31 30 30 24 31 12 7 1 19 31 DIF. BETWEEN (MAX.-MIN.) (C) 10.3 10.7 12.0 12.6 17.2 14.4 10.9 14.4 15.7 15.4 10.6 10.6 12.8 MEAN DAILY TEMP. (MDT) (C) -2.3 0.8 2.6 7.8 12.7 17.7 18.2 21.7 15.3 10.9 1.9 0.9 9.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.0 12.3 42.0 0.0 0.0 0.0 0.0 55.3 HEATING DEG. DAYS(BASE 18 0C) 630.7 481.0 476.8 304.7 166.8 33.4 35.2 2.4 82.8 220.0 483.9 531.0 3448.6 DEWPOINT (MEAN C) -5.5 -3.9 -3.5 -0.0 3.5 5.6 7.8 8.1 6.2 0.8 -2.4 -3.7 1.1 MIXING RATIO (G/KG) 3.22 3.58 3.71 4.76 6.13 7.16 8.34 8.63 7.45 5.03 4.05 3.64 5.47 VAPOUR PRESSURE (HPA) 4.22 4.67 4.85 6.23 8.00 9.31 10.83 11.22 9.71 6.60 5.32 4.80 7.15 SATURATION DEF. (HPA) 1.40 2.55 3.80 6.33 11.40 15.45 13.23 19.59 11.56 9.60 2.76 2.33 8.33 RELATIVE HUMIDITY (MEAN %) 78 70 63 56 50 42 49 41 54 50 72 72 58 RELATIVE HUMIDITY (MAX. %) 94 92 90 84 86 65 66 64 86 81 91 91 83 RELATIVE HUMIDITY (MIN. %) 62 49 42 39 31 30 37 28 35 34 57 53 41 RELATIVE HUMIDITY (MEAN% 03UTC) 93 90 88 83 85 62 60 62 85 80 89 91 81 RELATIVE HUMIDITY (MEAN% 09UTC) 69 58 51 45 39 34 41 31 41 36 60 58 47 RELATIVE HUMIDITY (MEAN% 15UTC) 78 67 60 54 46 42 54 43 52 50 74 72 58 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 25.4 37.0 20.4 39.5 43.4 2.8 20.0 3.3 8.1 39.4 35.5 13.1 287.9 DAYS WITH PRECIPITATION >=10 1 1 0 1 0 0 1 0 0 1 1 0 6 DAYS WITH PRECIPITATION >= 5 1 2 1 3 4 0 1 0 1 2 3 1 19 DAYS WITH PRECIPITATION >= 1 3 5 7 7 10 1 2 1 2 4 4 2 48 DAYS WITH PRECIPITATION 6 6 11 11 13 2 2 3 3 5 7 3 72 GREATEST DAILY PRECIPITATION 18.0 20.0 5.0 15.2 9.0 2.0 17.0 3.0 5.0 28.0 19.4 9.0 28.0 DAY 9 8 17 2 15 17 14 19 27 25 1 16 DAY WITH THUNDER STORM 0 0 0 0 2 0 0 1 0 1 0 0 4 DAYS WITH SNOW OR SLEET 3 3 6 2 1 0 0 0 0 0 5 2 22 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 90 270 270 270 270 90 90 90 90 270 270 270 90 PREVAILING WIND SPEED(KNOTS) 4.9 7.3 6.8 7.9 8.1 8.4 8.3 8.7 8.1 8.7 9.2 7.5 8.4 PREVAILING WIND PERCENT 8.4 23.6 12.3 19.3 17.4 33.3 52.3 38.7 30.7 19.4 16.7 12.9 18.0 CALMS PERCENT OF WIND 76.8 56.4 49.0 37.3 49.7 31.3 23.9 31.6 42.7 48.4 56.0 67.1 47.5 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 258 252 200 206 235 115 101 106 114 232 234 288 152 VECTOR WIND MAGNITUDE(KNOTS) 0.4 3.3 1.1 1.8 1.7 3.1 5.5 4.5 2.0 1.4 0.9 1.1 1.0 WIND STEADINESES (MEAN %) 28.6 91.7 25.0 30.5 41.5 53.4 91.7 75.0 42.6 34.1 21.4 44.0 22.7 WIND SPEED (MEAN KNOTS) 1.4 3.6 4.4 5.9 4.1 5.8 6.0 6.0 4.7 4.1 4.2 2.5 4.4 FASTEST WIND DIRECTION 330 320 60 120 270 180 100 100 120 200 90 100 60 FASTEST WIND SPEED (KNOTS) 17 23 29 23 17 16 16 16 16 17 16 16 29 DAY 23 18 4 8 31 4 12 1 11 12 10 10 DAYS WITH SKY CLEAR (0-2)/8 13 16 12 6 17 24 23 24 24 21 13 12 205 DAYS WITH P.CLOUDY (3-6)/8 9 9 13 19 10 5 7 7 6 7 8 12 112 DAYS WITH CLOUDY (7-8)/8 9 3 6 5 4 1 1 0 0 3 9 7 48 DAYS WITH VISIBILITY =< 2 KM 0 0 0 1 1 0 0 0 0 0 1 1 4 DURATION OF SUNSHINE HOURS 141.1 190.4 210.3 226.4 297.4 333.0 349.6 315.4 306.7 253.8 139.9 148.5 2912.5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 821.0 818.0 818.2 819.7 820.2 819.1 819.3 820.9 821.2 822.9 822.2 824.4 820.6 MAX. QFE PRESSURE IN HPA 832.3 826.1 824.9 824.6 827.4 825.6 823.7 828.3 826.2 827.7 828.6 829.9 832.3 DAY-HOUR 2- 6 11- 6 31- 6 22- 6 28- 3 16- 9 23- 6 20- 6 5- 6 2- 6 3- 3 24- 6 MIN. QFE PRESSURE IN HPA 811.2 803.6 809.8 811.6 813.2 808.4 814.1 816.3 815.5 818.8 814.4 815.2 803.6 DAY-HOUR 9- 9 20-12 21-12 13-15 19-15 24-15 21-15 29-12 15-12 31-12 26- 3 15-12 MEAN QNH PRESSURE IN HPA 1019.8 1016.2 1016.4 1018.2 1018.8 1017.6 1017.7 1019.7 1020.1 1022.1 1021.2 1023.8 1019.3 MAX. QNH PRESSURE IN HPA 1033.2 1025.9 1024.4 1024.1 1027.4 1025.3 1023.0 1028.5 1026.0 1027.8 1028.8 1030.4 1033.2 DAY-HOUR 2- 6 11- 6 31- 6 22- 6 28- 3 16- 9 23- 6 20- 6 5- 6 2- 6 3- 3 24- 6 MIN. QNH PRESSURE IN HPA 1008.1 999.0 1006.4 1008.6 1010.5 1004.8 1011.6 1014.2 1013.2 1017.2 1011.9 1012.9 999.0 DAY-HOUR 9- 9 20-12 21-12 13-15 19-15 24-15 21-15 29-12 15-12 31-12 26- 3 15-12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 821.0 818.2 818.4 820.2 820.8 819.8 819.7 821.5 821.8 823.1 822.0 824.4 820.9 MAX. QFE PRESSURE IN HPA 831.5 824.8 824.4 824.4 827.4 825.0 823.2 828.0 825.8 827.2 828.6 829.0 831.5 DAY 2 12 31 11 28 16 19 20 5 2 3 6 MIN. QFE PRESSURE IN HPA 811.5 809.0 810.2 814.4 815.2 810.0 816.1 818.1 817.7 819.4 814.4 816.5 809.0 DAY 9 20 21 8 14 25 14 13 16 31 26 14 MEAN QNH PRESSURE IN HPA 1019.8 1016.4 1016.7 1018.8 1019.5 1018.3 1018.2 1020.4 1020.8 1022.3 1021.0 1023.9 1019.7 MAX. QNH PRESSURE IN HPA 1032.3 1024.3 1023.8 1023.8 1027.4 1024.5 1022.4 1028.1 1025.5 1027.2 1028.8 1029.3 1032.3 DAY 2 12 31 11 28 16 19 20 5 2 3 6 MIN. QNH PRESSURE IN HPA 1008.5 1005.5 1006.9 1011.9 1012.9 1006.7 1013.9 1016.3 1015.8 1017.9 1011.9 1014.4 1005.5 DAY 9 20 21 8 14 25 14 13 16 31 26 14 MEAN QFF PRESSURE IN HPA 1025.9 1019.4 1018.1 1016.2 1012.8 1007.6 1007.5 1007.5 1012.9 1017.8 1023.4 1027.6 1016.4 MAX. QFF PRESSURE IN HPA 1042.3 1030.0 1028.1 1026.0 1020.9 1017.3 1013.4 1017.6 1023.1 1024.7 1039.9 1039.5 1042.3 DAY 2 12 19 10 22 16 13 20 28 26 30 6 MIN. QFF PRESSURE IN HPA 1008.7 1004.5 1004.4 1007.8 1004.1 993.4 1001.2 999.9 1004.8 1009.3 1008.6 1014.3 993.4 DAY 9 20 21 2 14 25 4 13 11 12 25 14 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 821.7 819.1 819.0 820.6 820.8 819.7 819.8 821.7 822.1 823.9 822.9 825.3 821.4 MAX. QFE PRESSURE IN HPA 832.3 826.1 824.9 824.6 827.4 825.3 823.7 828.3 826.2 827.7 828.6 829.9 832.3 DAY 2 11 31 22 28 16 23 20 5 2 3 24 MIN. QFE PRESSURE IN HPA 812.4 808.8 810.5 813.8 814.6 810.2 816.1 818.1 818.0 820.2 814.5 817.3 808.8 DAY 9 20 21 8 20 25 14 13 16 31 26 15 MEAN QNH PRESSURE IN HPA 1020.7 1017.5 1017.4 1019.2 1019.5 1018.3 1018.3 1020.6 1021.1 1023.3 1022.0 1024.9 1020.2 MAX. QNH PRESSURE IN HPA 1033.2 1025.9 1024.4 1024.1 1027.4 1024.9 1023.0 1028.5 1026.0 1027.8 1028.8 1030.4 1033.2 DAY 2 11 31 22 28 16 23 20 5 2 3 24 MIN. QNH PRESSURE IN HPA 1009.5 1005.2 1007.3 1011.2 1012.1 1006.9 1013.9 1016.3 1016.2 1018.8 1012.0 1015.4 1005.2 DAY 9 20 21 8 20 25 14 13 16 31 26 15 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 821.2 818.5 818.5 819.9 820.3 819.3 819.4 821.1 821.2 823.1 822.3 824.4 820.8 MAX. QFE PRESSURE IN HPA 830.8 825.4 824.5 824.6 826.8 825.6 823.7 827.1 825.4 826.7 828.3 829.2 830.8 DAY 2 11 31 22 28 16 23 19 4 2 30 10 MIN. QFE PRESSURE IN HPA 811.2 805.6 810.5 812.3 815.9 809.6 815.6 818.0 817.0 819.6 815.5 816.0 805.6 DAY 9 20 21 8 20 25 22 29 16 31 25 15 MEAN QNH PRESSURE IN HPA 1020.1 1016.8 1016.9 1018.5 1018.9 1017.8 1017.9 1019.9 1020.1 1022.3 1021.3 1023.8 1019.5 MAX. QNH PRESSURE IN HPA 1031.5 1025.0 1024.0 1024.1 1026.7 1025.3 1023.0 1027.1 1025.0 1026.6 1028.5 1029.6 1031.5 DAY 2 11 31 22 28 16 23 19 4 2 30 10 MIN. QNH PRESSURE IN HPA 1008.1 1001.4 1007.3 1009.4 1013.7 1006.2 1013.3 1016.2 1015.0 1018.1 1013.2 1013.8 1001.4 DAY 9 20 21 8 20 25 22 29 16 31 25 15 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 820.4 817.2 817.5 819.0 819.4 818.6 818.9 820.1 820.4 822.2 821.7 823.6 819.9 MAX. QFE PRESSURE IN HPA 829.3 824.0 823.7 824.4 825.3 825.6 822.8 826.2 825.1 826.6 827.8 828.5 829.3 DAY 2 11 18 22 28 16 18 19 4 7 30 24 MIN. QFE PRESSURE IN HPA 811.8 803.6 809.8 811.8 814.3 809.3 814.5 816.3 815.5 818.8 814.8 815.2 803.6 DAY 9 20 21 8 19 25 21 29 15 31 25 15 MEAN QNH PRESSURE IN HPA 1019.1 1015.2 1015.6 1017.4 1017.9 1016.9 1017.2 1018.8 1019.1 1021.2 1020.6 1022.9 1018.5 MAX. QNH PRESSURE IN HPA 1029.7 1023.4 1023.0 1023.8 1024.9 1025.3 1021.9 1026.0 1024.7 1026.5 1027.9 1028.7 1029.7 DAY 2 11 18 22 28 16 18 19 4 7 30 24 MIN. QNH PRESSURE IN HPA 1008.8 999.0 1006.4 1008.8 1011.8 1005.8 1012.0 1014.2 1013.2 1017.2 1012.4 1012.9 999.0 DAY 9 20 21 8 19 25 21 29 15 31 25 15 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 820.7 817.4 817.5 819.0 819.5 818.3 818.8 820.1 820.6 822.3 822.3 824.1 820.1 MAX. QFE PRESSURE IN HPA 828.6 824.2 823.7 824.4 825.6 825.6 822.6 827.7 825.1 826.4 828.2 828.5 828.6 DAY 2 11 18 22 28 16 18 19 4 7 30 17 MIN. QFE PRESSURE IN HPA 811.2 804.2 810.6 811.6 813.2 808.4 814.1 816.8 815.7 818.8 815.6 815.2 804.2 DAY 9 20 21 13 19 24 21 6 12 31 25 15 MEAN QNH PRESSURE IN HPA 1019.4 1015.5 1015.6 1017.4 1018.0 1016.6 1017.1 1018.8 1019.4 1021.3 1021.3 1023.5 1018.6 MAX. QNH PRESSURE IN HPA 1028.8 1023.6 1023.0 1023.8 1025.3 1025.3 1021.7 1027.8 1024.7 1026.2 1028.4 1028.7 1028.8 DAY 2 11 18 22 28 16 18 19 4 7 30 17 MIN. QNH PRESSURE IN HPA 1008.1 999.7 1007.4 1008.6 1010.5 1004.8 1011.6 1014.8 1013.5 1017.2 1013.3 1012.9 999.7 DAY 9 20 21 13 19 24 21 6 12 31 25 15 MEAN QFF PRESSURE IN HPA 1025.4 1018.3 1016.9 1014.6 1011.1 1005.8 1006.0 1005.7 1011.3 1016.9 1023.8 1027.0 1015.2 MAX. QFF PRESSURE IN HPA 1040.4 1028.7 1029.3 1024.0 1017.4 1017.9 1010.4 1018.2 1019.5 1025.4 1039.7 1037.6 1040.4 DAY 2 11 18 22 21 16 27 19 27 26 30 6 MIN. QFF PRESSURE IN HPA 1009.6 999.2 1004.8 1005.0 1000.4 991.2 997.5 1000.9 1002.5 1010.0 1009.7 1013.1 991.2 DAY 9 20 21 13 19 24 21 28 12 17 25 15 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -2.9 -2.2 2.6 12.2 16.0 18.9 22.6 21.9 17.5 9.3 2.9 0.5 10.0 MINIMUN AIR TEMPERATURE (C) -8.2 -9.1 -4.0 3.7 6.3 8.9 12.9 13.1 8.6 2.3 -3.1 -3.7 2.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 25 24 15 0 0 0 0 0 0 0 15 12 91 DAYS WITH FREEZING MIN.<= 0 30 29 27 3 0 0 0 0 0 9 23 26 147 TEMPERATURE RECORDS LOWEST(C) -21.6 -21.5 -14.0 -3.2 1.4 0.6 4.6 8.6 2.6 -2.0 -10.2 -10.0 -21.6 DAY 18 9 3 2 11 14 23 28 27 16 11 29 MAXIMUM AIR TEMPERATURE (C) 1.2 2.3 7.2 16.9 20.7 23.8 27.2 26.7 23.1 14.4 7.4 4.0 14.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 3 6 10 1 0 0 0 20 DAYS WITH MAXIMUM TEMP. <= 0 12 6 1 0 0 0 0 0 0 0 0 2 21 TEMPERATURE RECORDS HIGHEST(C) 14.0 9.4 14.0 21.4 26.4 33.6 31.8 33.8 30.2 21.0 12.0 8.8 33.8 DAY 1 24 22 16 26 30 20 3 8 11 4 1 DIF. BETWEEN (MAX.-MIN.) (C) 9.4 11.4 11.2 13.2 14.4 14.9 14.3 13.6 14.5 12.1 10.5 7.7 12.3 MEAN DAILY TEMP. (MDT) (C) -3.5 -3.4 1.6 10.3 13.5 16.4 20.0 19.9 15.8 8.3 2.1 0.1 8.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 4.3 14.0 7.2 0.0 0.0 0.0 0.0 25.5 HEATING DEG. DAYS(BASE 18 0C) 666.8 619.6 508.2 231.8 141.1 69.6 9.5 5.4 69.5 299.4 476.3 554.3 3651.5 DEWPOINT (MEAN C) -7.4 -7.6 -4.7 1.4 3.7 5.8 7.4 9.0 7.3 2.8 -1.2 -2.9 1.1 MIXING RATIO (G/KG) 2.82 2.77 3.47 5.29 6.24 7.24 8.22 9.09 8.08 5.77 4.37 3.83 5.60 VAPOUR PRESSURE (HPA) 3.69 3.63 4.54 6.91 8.13 9.43 10.69 11.82 10.52 7.57 5.75 5.02 7.31 SATURATION DEF. (HPA) 1.65 1.93 3.33 7.99 10.81 13.92 17.93 15.82 10.66 4.76 2.03 1.48 7.69 RELATIVE HUMIDITY (MEAN %) 74 70 63 51 48 47 41 49 57 68 77 80 60 RELATIVE HUMIDITY (MAX. %) 90 90 87 82 76 70 60 71 87 93 95 94 83 RELATIVE HUMIDITY (MIN. %) 58 54 47 35 33 34 29 36 39 49 58 65 45 RELATIVE HUMIDITY (MEAN% 03UTC) 86 88 86 81 75 67 56 69 86 92 95 92 81 RELATIVE HUMIDITY (MEAN% 09UTC) 64 59 52 41 38 39 33 40 43 53 61 71 50 RELATIVE HUMIDITY (MEAN% 15UTC) 78 67 59 45 44 48 44 50 59 72 81 83 61 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 31.5 22.5 91.9 38.7 28.0 12.3 4.6 0.3 18.2 61.9 12.7 18.1 340.7 DAYS WITH PRECIPITATION >=10 1 0 3 1 1 0 0 0 1 2 0 0 9 DAYS WITH PRECIPITATION >= 5 2 2 5 2 3 1 0 0 2 2 1 1 21 DAYS WITH PRECIPITATION >= 1 6 5 8 3 4 3 2 0 4 7 3 4 49 DAYS WITH PRECIPITATION 12 10 11 9 4 4 3 1 4 8 6 9 81 GREATEST DAILY PRECIPITATION 18.0 6.0 34.0 27.0 11.0 9.0 3.0 0.3 10.0 36.0 6.0 6.1 36.0 DAY 6 7 24 21 9 12 8 11 30 27 24 15 DAY WITH THUNDER STORM 0 0 0 5 4 1 1 0 0 2 0 0 13 DAYS WITH SNOW OR SLEET 5 7 4 0 0 0 0 0 0 0 2 8 26 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 90 90 270 270 270 90 90 90 90 90 90 90 90 PREVAILING WIND SPEED(KNOTS) 7.9 12.1 5.8 8.8 6.7 8.1 8.8 8.0 8.1 7.2 7.8 10.2 8.3 PREVAILING WIND PERCENT 14.8 11.0 21.3 30.0 22.6 36.0 47.7 44.5 25.3 20.0 8.0 8.4 19.6 CALMS PERCENT OF WIND 47.7 56.6 56.8 42.7 45.2 33.3 25.2 28.4 44.0 54.2 81.3 80.6 49.6 NO. OF WIND OBSERVATION 155 145 155 150 155 150 155 155 150 155 150 155 1830 VECTOR WIND DIRECTION (MEAN) 212 227 245 247 226 107 101 106 120 126 94 182 136 VECTOR WIND MAGNITUDE(KNOTS) 2.2 0.7 1.4 3.8 1.3 4.6 5.8 4.1 2.7 1.7 0.8 0.4 1.3 WIND STEADINESES (MEAN %) 44.0 17.9 45.2 73.1 33.3 85.2 90.6 71.9 61.4 53.1 61.5 21.1 31.7 WIND SPEED (MEAN KNOTS) 5.0 3.9 3.1 5.2 3.9 5.4 6.4 5.7 4.4 3.2 1.3 1.9 4.1 FASTEST WIND DIRECTION 210 90 120 250 270 120 330 100 260 200 90 240 210 FASTEST WIND SPEED (KNOTS) 29 19 19 23 16 16 16 16 17 16 14 17 29 DAY 19 7 8 10 3 19 8 17 7 26 9 21 DAYS WITH SKY CLEAR (0-2)/8 9 13 15 9 21 26 28 25 23 14 9 9 201 DAYS WITH P.CLOUDY (3-6)/8 14 8 8 14 10 3 3 6 6 8 16 11 107 DAYS WITH CLOUDY (7-8)/8 8 8 8 7 0 1 0 0 1 9 5 11 58 DAYS WITH VISIBILITY =< 2 KM 2 1 0 1 0 0 0 0 0 1 1 0 6 DURATION OF SUNSHINE HOURS 143.7 188.6 219.9 214.1 314.8 355.6 375.7 336.1 289.2 206.0 136.0 107.1 2886.8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 818.0 819.1 817.9 819.8 819.2 819.4 820.9 821.0 821.3 823.9 824.5 821.0 820.5 MAX. QFE PRESSURE IN HPA 826.4 827.4 824.8 826.1 823.4 824.5 827.9 825.4 826.5 828.0 832.3 828.4 832.3 DAY-HOUR 31- 6 29- 6 27- 3 2- 6 5- 6 13- 6 30- 6 23- 6 9- 6 30- 6 17- 6 4- 6 MIN. QFE PRESSURE IN HPA 805.0 809.9 809.3 814.0 813.5 815.0 813.7 814.0 815.8 820.0 819.1 812.2 805.0 DAY-HOUR 21- 3 6-12 24-15 10- 9 19-15 5-12 10-15 30-15 1-12 23-12 22-12 21- 3 MEAN QNH PRESSURE IN HPA 1016.2 1017.5 1016.1 1018.4 1017.7 1017.9 1019.6 1019.7 1020.1 1023.2 1023.9 1019.7 1019.2 MAX. QNH PRESSURE IN HPA 1026.2 1027.4 1024.3 1025.9 1022.6 1024.0 1028.0 1025.0 1026.3 1028.1 1033.2 1028.6 1033.2 DAY-HOUR 31- 6 29- 6 27- 3 2- 6 5- 6 13- 6 30- 6 23- 6 9- 6 30- 6 17- 6 4- 6 MIN. QNH PRESSURE IN HPA 1000.7 1006.5 1005.8 1011.4 1010.8 1012.6 1011.1 1011.4 1013.6 1018.6 1017.5 1009.3 1000.7 DAY-HOUR 21- 3 6-12 24-15 10- 9 19-15 5-12 10-15 30-15 1-12 23-12 22-12 21- 3 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 818.0 818.9 818.0 820.3 819.8 820.0 821.3 821.6 821.8 824.1 824.5 820.7 820.7 MAX. QFE PRESSURE IN HPA 826.0 826.2 824.8 825.7 823.0 824.3 827.1 824.6 826.0 827.2 831.9 827.2 831.9 DAY 31 29 27 2 5 13 30 23 9 30 17 4 MIN. QFE PRESSURE IN HPA 805.0 810.8 811.3 814.4 815.4 816.2 815.8 816.0 816.6 821.7 820.0 812.2 805.0 DAY 21 7 24 10 20 26 11 31 1 25 22 21 MEAN QNH PRESSURE IN HPA 1016.3 1017.3 1016.2 1018.9 1018.3 1018.6 1020.1 1020.5 1020.7 1023.4 1024.0 1019.4 1019.5 MAX. QNH PRESSURE IN HPA 1025.7 1026.0 1024.3 1025.4 1022.2 1023.7 1027.1 1024.1 1025.7 1027.2 1032.8 1027.2 1032.8 DAY 31 29 27 2 5 13 30 23 9 30 17 4 MIN. QNH PRESSURE IN HPA 1000.7 1007.6 1008.2 1011.9 1013.1 1014.1 1013.6 1013.8 1014.5 1020.6 1018.6 1009.3 1000.7 DAY 21 7 24 10 20 26 11 31 1 25 22 21 MEAN QFF PRESSURE IN HPA 1022.9 1023.8 1018.8 1014.1 1010.7 1009.0 1007.9 1008.7 1012.4 1021.1 1026.3 1022.9 1016.5 MAX. QFF PRESSURE IN HPA 1037.6 1037.5 1030.9 1025.0 1019.1 1020.5 1014.8 1014.2 1017.3 1028.0 1039.0 1033.5 1039.0 DAY 9 10 1 2 5 13 23 8 29 30 17 29 MIN. QFF PRESSURE IN HPA 1002.0 1011.3 1006.2 1006.4 1003.1 1003.0 998.1 1002.0 1001.2 1014.5 1019.4 1009.5 998.1 DAY 21 7 24 15 26 26 11 31 1 1 22 21 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 818.9 820.0 818.9 820.8 819.8 820.0 821.5 821.9 822.1 824.7 825.2 821.6 821.3 MAX. QFE PRESSURE IN HPA 826.4 827.4 824.8 826.1 823.4 824.5 827.9 825.4 826.5 828.0 832.3 828.4 832.3 DAY 31 29 27 2 5 13 30 23 9 30 17 4 MIN. QFE PRESSURE IN HPA 806.0 813.6 812.0 815.0 815.7 816.0 816.2 816.4 817.4 821.7 820.9 813.4 806.0 DAY 21 7 24 10 20 26 11 31 1 25 22 21 MEAN QNH PRESSURE IN HPA 1017.3 1018.6 1017.3 1019.6 1018.4 1018.6 1020.3 1020.8 1021.1 1024.2 1024.8 1020.5 1020.1 MAX. QNH PRESSURE IN HPA 1026.2 1027.4 1024.3 1025.9 1022.6 1024.0 1028.0 1025.0 1026.3 1028.1 1033.2 1028.6 1033.2 DAY 31 29 27 2 5 13 30 23 9 30 17 4 MIN. QNH PRESSURE IN HPA 1001.9 1011.0 1009.0 1012.6 1013.5 1013.8 1014.1 1014.3 1015.5 1020.6 1019.7 1010.7 1001.9 DAY 21 7 24 10 20 26 11 31 1 25 22 21 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 818.0 819.5 818.3 820.2 819.5 819.6 821.1 821.2 821.3 823.9 824.5 821.1 820.7 MAX. QFE PRESSURE IN HPA 825.6 827.2 823.8 825.0 823.4 824.3 827.6 824.8 825.5 827.5 830.7 827.4 830.7 DAY 30 29 27 2 5 13 30 8 9 30 17 4 MIN. QFE PRESSURE IN HPA 805.2 811.5 811.0 814.0 815.4 816.2 815.3 815.4 816.8 820.4 819.8 812.9 805.2 DAY 21 6 24 10 26 26 10 31 1 23 21 21 MEAN QNH PRESSURE IN HPA 1016.2 1018.0 1016.6 1018.8 1018.0 1018.2 1019.9 1020.0 1020.2 1023.2 1024.0 1019.9 1019.4 MAX. QNH PRESSURE IN HPA 1025.3 1027.2 1023.1 1024.5 1022.6 1023.7 1027.6 1024.3 1025.1 1027.5 1031.3 1027.4 1031.3 DAY 30 29 27 2 5 13 30 8 9 30 17 4 MIN. QNH PRESSURE IN HPA 1000.9 1008.5 1007.9 1011.4 1013.1 1014.1 1013.0 1013.1 1014.8 1019.1 1018.4 1010.1 1000.9 DAY 21 6 24 10 26 26 10 31 1 23 21 21 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 817.3 818.5 817.3 819.0 818.6 818.8 820.4 820.2 820.4 823.3 823.9 820.6 819.9 MAX. QFE PRESSURE IN HPA 825.0 825.9 822.6 823.5 821.9 822.8 827.4 824.2 824.4 826.4 830.1 826.8 830.1 DAY 30 29 26 2 22 12 30 8 25 4 16 4 MIN. QFE PRESSURE IN HPA 805.2 809.9 810.4 814.5 814.3 815.0 814.2 814.2 815.8 820.0 819.1 813.3 805.2 DAY 19 6 24 21 19 5 10 30 1 23 22 21 MEAN QNH PRESSURE IN HPA 1015.4 1016.8 1015.3 1017.4 1016.9 1017.2 1019.0 1018.8 1019.1 1022.5 1023.2 1019.3 1018.4 MAX. QNH PRESSURE IN HPA 1024.5 1025.6 1021.7 1022.8 1020.9 1021.9 1027.4 1023.6 1023.8 1026.2 1030.6 1026.7 1030.6 DAY 30 29 26 2 22 12 30 8 25 4 16 4 MIN. QNH PRESSURE IN HPA 1000.9 1006.5 1007.1 1012.0 1011.8 1012.6 1011.7 1011.7 1013.6 1018.6 1017.5 1010.6 1000.9 DAY 19 6 24 21 19 5 10 30 1 23 22 21 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 817.7 818.7 817.2 818.8 818.6 818.8 820.3 820.0 820.6 823.5 824.3 820.9 819.9 MAX. QFE PRESSURE IN HPA 825.8 825.9 823.6 823.1 822.8 823.6 827.4 824.2 824.8 827.0 830.3 826.8 830.3 DAY 30 10 26 4 5 12 30 8 25 30 16 4 MIN. QFE PRESSURE IN HPA 808.0 809.9 809.3 815.0 813.5 815.1 813.7 814.0 816.7 820.1 819.3 814.8 808.0 DAY 19 6 24 9 19 25 10 30 1 17 21 21 MEAN QNH PRESSURE IN HPA 1015.8 1017.1 1015.3 1017.2 1016.9 1017.1 1018.9 1018.6 1019.4 1022.8 1023.7 1019.7 1018.5 MAX. QNH PRESSURE IN HPA 1025.5 1025.6 1022.9 1022.3 1021.9 1022.9 1027.4 1023.6 1024.3 1026.9 1030.9 1026.7 1030.9 DAY 30 10 26 4 5 12 30 8 25 30 16 4 MIN. QNH PRESSURE IN HPA 1004.3 1006.5 1005.8 1012.6 1010.8 1012.7 1011.1 1011.4 1014.7 1018.7 1017.8 1012.4 1004.3 DAY 19 6 24 9 19 25 10 30 1 17 21 21 MEAN QFF PRESSURE IN HPA 1022.4 1023.5 1017.5 1012.3 1009.1 1007.2 1006.5 1006.6 1010.9 1020.4 1026.0 1023.1 1015.5 MAX. QFF PRESSURE IN HPA 1034.7 1038.2 1030.3 1020.4 1016.2 1019.1 1013.2 1013.8 1017.7 1027.3 1035.3 1031.9 1038.2 DAY 9 10 3 2 5 12 30 8 28 30 17 28 MIN. QFF PRESSURE IN HPA 1006.9 1009.6 1004.9 1005.0 998.0 1000.0 997.5 998.4 1003.9 1015.0 1017.8 1013.4 997.5 DAY 19 6 24 14 26 23 11 3 6 17 21 21 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -2.3 0.5 7.1 12.3 14.7 19.3 19.8 22.1 18.5 11.2 4.5 2.3 10.8 MINIMUN AIR TEMPERATURE (C) -8.0 -5.4 -2.1 3.3 4.3 8.1 12.9 12.5 8.3 3.4 -1.8 -1.4 2.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 25 16 9 0 0 0 0 0 0 0 6 9 65 DAYS WITH FREEZING MIN.<= 0 30 28 25 8 0 0 0 0 0 9 20 21 141 TEMPERATURE RECORDS LOWEST(C) -24.5 -12.0 -9.8 -3.0 0.4 1.4 3.4 3.0 1.4 -2.2 -20.6 -9.6 -24.5 DAY 28 1 12 14 27 2 19 13 26 22 20 22 MAXIMUM AIR TEMPERATURE (C) 2.2 4.6 12.4 17.2 20.3 24.2 23.6 27.5 24.1 16.2 8.9 5.5 15.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 3 2 11 0 0 0 0 16 DAYS WITH MAXIMUM TEMP. <= 0 10 1 1 0 0 0 0 0 0 0 2 0 14 TEMPERATURE RECORDS HIGHEST(C) 8.4 12.0 19.4 23.2 27.8 34.8 31.4 34.4 28.4 23.0 17.0 11.8 34.8 DAY 10 28 29 5 16 23 9 2 3 6 5 29 DIF. BETWEEN (MAX.-MIN.) (C) 10.2 10.0 14.5 13.9 16.0 16.1 10.7 15.0 15.8 12.8 10.7 6.9 12.7 MEAN DAILY TEMP. (MDT) (C) -2.9 -0.4 5.2 10.2 12.3 16.2 18.2 20.0 16.2 9.8 3.5 2.1 9.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.2 7.4 22.8 0.0 0.0 0.0 0.0 31.4 HEATING DEG. DAYS(BASE 18 0C) 647.5 514.4 398.1 233.4 177.5 68.1 26.5 11.4 59.5 253.7 433.5 494.4 3318.0 DEWPOINT (MEAN C) -6.7 -5.7 -1.9 1.2 3.2 6.2 8.3 7.4 5.8 2.4 -1.8 -2.6 1.3 MIXING RATIO (G/KG) 2.96 3.15 4.15 5.21 5.99 7.51 8.66 8.19 7.22 5.71 4.30 4.08 5.59 VAPOUR PRESSURE (HPA) 3.89 4.13 5.43 6.81 7.80 9.76 11.24 10.67 9.43 7.49 5.64 5.34 7.30 SATURATION DEF. (HPA) 1.61 2.47 5.52 8.28 9.91 14.08 12.73 17.61 13.28 6.75 3.46 2.06 8.15 RELATIVE HUMIDITY (MEAN %) 75 67 58 52 51 47 51 45 49 60 68 74 58 RELATIVE HUMIDITY (MAX. %) 91 89 91 84 81 70 65 71 80 88 90 87 82 RELATIVE HUMIDITY (MIN. %) 58 52 40 35 34 34 40 30 32 43 50 62 43 RELATIVE HUMIDITY (MEAN% 03UTC) 90 88 90 82 81 69 61 67 79 87 86 84 80 RELATIVE HUMIDITY (MEAN% 09UTC) 62 58 47 41 39 39 43 34 36 47 54 68 47 RELATIVE HUMIDITY (MEAN% 15UTC) 76 61 49 46 50 48 56 44 47 61 73 75 57 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 13.7 11.6 22.2 44.3 31.6 0.1 5.0 2.6 0.0 46.0 55.7 83.3 316.1 DAYS WITH PRECIPITATION >=10 0 0 1 1 1 0 0 0 0 1 1 3 8 DAYS WITH PRECIPITATION >= 5 0 1 1 4 1 0 0 0 0 4 5 4 20 DAYS WITH PRECIPITATION >= 1 4 3 4 6 3 0 2 1 0 6 8 5 42 DAYS WITH PRECIPITATION 8 6 7 8 8 1 2 2 1 9 11 10 73 GREATEST DAILY PRECIPITATION 4.6 6.0 12.0 19.0 25.0 0.1 3.0 2.0 0.0 24.0 19.0 37.0 37.0 DAY 26 4 25 9 3 19 18 10 ** 1 11 30 DAY WITH THUNDER STORM 0 0 0 3 2 0 0 1 0 3 1 1 11 DAYS WITH SNOW OR SLEET 6 2 4 0 0 0 0 0 0 0 3 4 19 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 90 270 270 270 270 90 90 90 90 270 270 270 90 PREVAILING WIND SPEED(KNOTS) 8.9 8.3 8.4 7.3 7.2 7.6 8.2 8.8 7.9 7.7 6.8 7.6 8.3 PREVAILING WIND PERCENT 19.4 20.0 18.7 24.7 20.0 45.3 65.2 38.1 17.3 16.1 18.7 21.3 20.2 CALMS PERCENT OF WIND 73.5 52.9 54.2 46.7 36.8 31.3 23.2 42.6 49.3 47.1 46.0 38.7 45.2 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 82 247 241 251 200 102 93 101 148 212 237 250 162 VECTOR WIND MAGNITUDE(KNOTS) 1.4 2.8 2.0 2.4 1.9 4.1 6.1 3.3 0.8 1.3 1.7 2.9 0.9 WIND STEADINESES (MEAN %) 63.6 66.7 51.3 58.5 40.4 78.8 96.8 70.2 20.0 32.5 37.8 51.8 20.5 WIND SPEED (MEAN KNOTS) 2.2 4.2 3.9 4.1 4.7 5.2 6.3 4.7 4.0 4.0 4.5 5.6 4.4 FASTEST WIND DIRECTION 80 260 280 250 210 90 90 100 100 240 90 240 90 FASTEST WIND SPEED (KNOTS) 16 23 17 19 19 16 16 16 16 17 25 19 25 DAY 23 23 17 6 16 9 1 4 1 16 18 18 DAYS WITH SKY CLEAR (0-2)/8 13 9 14 7 14 26 24 24 25 16 9 7 188 DAYS WITH P.CLOUDY (3-6)/8 9 10 11 18 14 4 5 6 4 10 14 12 117 DAYS WITH CLOUDY (7-8)/8 9 9 6 5 3 0 2 1 1 5 7 12 60 DAYS WITH VISIBILITY =< 2 KM 0 0 1 0 0 0 0 0 0 1 1 2 5 DURATION OF SUNSHINE HOURS 147.4 167.1 227.4 239.3 296.1 379.1 352.6 339.0 292.7 228.8 154.1 118.0 2941.6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 822.2 818.7 819.3 819.6 818.5 819.0 819.8 821.2 822.1 823.2 821.7 821.3 820.6 MAX. QFE PRESSURE IN HPA 825.5 828.8 828.7 828.1 824.9 824.6 824.8 827.0 828.1 831.9 828.2 828.4 831.9 DAY-HOUR 9- 6 9- 6 1- 6 2- 6 18- 6 2- 6 29- 6 11- 6 19- 6 10- 6 2- 6 9- 3 MIN. QFE PRESSURE IN HPA 818.0 802.4 808.8 812.2 811.3 809.1 813.2 814.4 817.1 817.0 808.8 812.6 802.4 DAY-HOUR 19-12 21- 6 25- 3 12- 9 8-12 17-15 9-15 30-12 5-12 25-12 18- 3 20- 3 MEAN QNH PRESSURE IN HPA 1021.2 1017.1 1017.8 1018.1 1016.9 1017.4 1018.3 1020.0 1021.1 1022.4 1020.6 1020.1 1019.3 MAX. QNH PRESSURE IN HPA 1025.1 1029.1 1029.0 1028.2 1024.4 1024.1 1024.3 1026.9 1028.2 1032.8 1028.4 1028.6 1032.8 DAY-HOUR 9- 6 9- 6 1- 6 2- 6 18- 6 2- 6 29- 6 11- 6 19- 6 10- 6 2- 6 9- 3 MIN. QNH PRESSURE IN HPA 1016.2 997.6 1005.2 1009.3 1008.2 1005.6 1010.5 1011.9 1015.1 1015.0 1005.2 1009.8 997.6 DAY-HOUR 19-12 21- 6 25- 3 12- 9 8-12 17-15 9-15 30-12 5-12 25-12 18- 3 20- 3 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 822.1 818.6 819.5 820.0 819.2 819.8 820.1 821.9 822.7 823.4 821.6 821.3 820.9 MAX. QFE PRESSURE IN HPA 825.0 827.7 826.9 827.9 824.1 824.5 824.5 826.3 827.4 831.7 826.7 828.4 831.7 DAY 9 9 1 2 18 2 28 5 19 10 4 9 MIN. QFE PRESSURE IN HPA 818.6 803.4 808.8 814.7 811.7 813.2 815.1 817.1 819.2 818.3 808.8 812.6 803.4 DAY 18 21 25 12 9 17 18 27 6 19 18 20 MEAN QNH PRESSURE IN HPA 1021.1 1017.0 1018.0 1018.6 1017.7 1018.4 1018.7 1020.9 1021.8 1022.7 1020.5 1020.1 1019.6 MAX. QNH PRESSURE IN HPA 1024.5 1027.8 1026.8 1028.0 1023.5 1024.0 1024.0 1026.1 1027.4 1032.5 1026.6 1028.6 1032.5 DAY 9 9 1 2 18 2 28 5 19 10 4 9 MIN. QNH PRESSURE IN HPA 1016.9 998.8 1005.2 1012.3 1008.7 1010.5 1012.7 1015.1 1017.6 1016.6 1005.2 1009.8 998.8 DAY 18 21 25 12 9 17 18 27 6 19 18 20 MEAN QFF PRESSURE IN HPA 1027.5 1020.8 1017.4 1013.8 1011.4 1008.3 1007.9 1009.4 1013.2 1018.9 1021.4 1021.8 1016.0 MAX. QFF PRESSURE IN HPA 1039.8 1032.5 1032.9 1024.8 1019.3 1017.8 1012.4 1017.1 1022.4 1028.5 1039.1 1031.8 1039.8 DAY 28 9 11 2 18 11 29 11 22 27 20 22 MIN. QFF PRESSURE IN HPA 1019.0 998.8 1001.3 1004.9 1002.4 998.6 1000.1 1004.4 1005.5 1008.7 1004.4 1007.6 998.6 DAY 4 21 24 6 8 18 9 24 5 19 18 20 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 823.0 819.6 820.1 820.4 819.2 819.8 820.3 822.1 823.1 824.1 822.5 822.0 821.3 MAX. QFE PRESSURE IN HPA 825.5 828.8 828.7 828.1 824.9 824.6 824.8 827.0 828.1 831.9 828.2 828.4 831.9 DAY 9 9 1 2 18 2 29 11 19 10 2 9 MIN. QFE PRESSURE IN HPA 819.2 802.4 809.8 813.7 811.7 812.8 815.4 817.3 819.3 819.4 809.5 813.0 802.4 DAY 18 21 25 12 9 17 9 30 7 31 18 20 MEAN QNH PRESSURE IN HPA 1022.1 1018.1 1018.7 1019.0 1017.6 1018.3 1018.9 1021.1 1022.3 1023.5 1021.6 1021.0 1020.2 MAX. QNH PRESSURE IN HPA 1025.1 1029.1 1029.0 1028.2 1024.4 1024.1 1024.3 1026.9 1028.2 1032.8 1028.4 1028.6 1032.8 DAY 9 9 1 2 18 2 29 11 19 10 2 9 MIN. QNH PRESSURE IN HPA 1017.6 997.6 1006.4 1011.1 1008.7 1010.0 1013.1 1015.4 1017.8 1017.9 1006.1 1010.2 997.6 DAY 18 21 25 12 9 17 9 30 7 31 18 20 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 822.4 819.0 819.8 819.9 818.7 819.2 819.9 821.5 822.2 823.3 821.7 821.3 820.7 MAX. QFE PRESSURE IN HPA 824.8 828.6 827.7 828.0 824.3 824.1 824.4 826.8 827.5 831.5 827.1 827.6 831.5 DAY 16 9 1 2 18 2 29 11 19 10 4 9 MIN. QFE PRESSURE IN HPA 819.0 803.4 810.8 812.2 811.7 811.4 814.6 815.9 818.5 818.2 809.8 813.0 803.4 DAY 18 21 25 12 9 17 9 30 5 25 18 20 MEAN QNH PRESSURE IN HPA 1021.5 1017.5 1018.3 1018.4 1017.0 1017.6 1018.5 1020.3 1021.3 1022.5 1020.6 1020.1 1019.5 MAX. QNH PRESSURE IN HPA 1024.3 1028.8 1027.8 1028.1 1023.7 1023.5 1023.8 1026.7 1027.5 1032.3 1027.1 1027.6 1032.3 DAY 16 9 1 2 18 2 29 11 19 10 4 9 MIN. QNH PRESSURE IN HPA 1017.4 998.8 1007.6 1009.3 1008.7 1008.3 1012.1 1013.7 1016.8 1016.4 1006.4 1010.2 998.8 DAY 18 21 25 12 9 17 9 30 5 25 18 20 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 821.6 818.1 818.6 818.8 817.9 818.2 819.3 820.3 821.3 822.6 821.3 820.7 819.9 MAX. QFE PRESSURE IN HPA 824.4 827.4 827.0 827.6 823.7 823.2 823.6 826.2 827.3 830.8 826.5 827.2 830.8 DAY 9 9 1 1 18 11 28 11 19 10 14 9 MIN. QFE PRESSURE IN HPA 818.0 803.8 810.3 812.4 811.3 809.9 813.6 814.4 817.1 817.0 809.2 813.3 803.8 DAY 19 21 24 12 8 17 9 30 5 25 17 5 MEAN QNH PRESSURE IN HPA 1020.5 1016.3 1016.9 1017.2 1016.1 1016.4 1017.8 1019.0 1020.2 1021.7 1020.1 1019.4 1018.5 MAX. QNH PRESSURE IN HPA 1023.8 1027.4 1026.9 1027.6 1023.0 1022.4 1022.9 1026.0 1027.3 1031.5 1026.3 1027.2 1031.5 DAY 9 9 1 1 18 11 28 11 19 10 14 9 MIN. QNH PRESSURE IN HPA 1016.2 999.3 1007.0 1009.5 1008.2 1006.5 1011.0 1011.9 1015.1 1015.0 1005.7 1010.6 999.3 DAY 19 21 24 12 8 17 9 30 5 25 17 5 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 821.9 818.4 818.8 818.8 817.8 818.2 819.2 820.3 821.4 822.8 821.6 821.0 820.0 MAX. QFE PRESSURE IN HPA 824.9 827.4 826.8 827.2 823.4 822.9 823.4 825.4 827.2 830.2 827.0 827.4 830.2 DAY 30 9 1 1 18 3 28 11 19 10 3 9 MIN. QFE PRESSURE IN HPA 818.4 805.2 810.3 813.2 811.3 809.1 813.2 814.6 817.6 817.0 810.2 814.4 805.2 DAY 19 21 24 12 8 17 9 30 7 25 17 19 MEAN QNH PRESSURE IN HPA 1020.9 1016.7 1017.2 1017.1 1016.0 1016.4 1017.7 1019.0 1020.2 1021.9 1020.6 1019.8 1018.6 MAX. QNH PRESSURE IN HPA 1024.4 1027.4 1026.7 1027.2 1022.6 1022.0 1022.6 1025.0 1027.2 1030.7 1026.9 1027.4 1030.7 DAY 30 9 1 1 18 3 28 11 19 10 3 9 MIN. QNH PRESSURE IN HPA 1016.7 1000.9 1007.0 1010.5 1008.2 1005.6 1010.5 1012.1 1015.7 1015.0 1006.9 1011.9 1000.9 DAY 19 21 24 12 8 17 9 30 7 25 17 19 MEAN QFF PRESSURE IN HPA 1027.3 1020.4 1016.4 1012.2 1009.6 1006.2 1006.5 1007.4 1011.5 1018.2 1021.5 1021.4 1014.9 MAX. QFF PRESSURE IN HPA 1037.7 1031.6 1029.6 1022.6 1019.6 1016.2 1010.5 1016.4 1022.9 1028.0 1038.4 1031.4 1038.4 DAY 28 9 10 1 18 11 21 11 19 27 20 22 MIN. QFF PRESSURE IN HPA 1018.9 1004.3 1000.8 1004.5 1001.2 993.8 995.2 1000.5 1005.2 1007.6 1003.7 1010.1 993.8 DAY 4 21 24 26 8 17 9 28 4 25 17 19 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -2.0 0.6 5.5 7.1 11.2 16.6 19.6 19.1 17.3 12.3 3.5 -5.0 8.8 MINIMUN AIR TEMPERATURE (C) -7.1 -6.0 -1.9 3.0 4.8 8.0 13.6 12.2 6.6 4.0 -1.7 -10.0 2.1 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 23 19 9 0 0 0 0 0 0 0 9 23 83 DAYS WITH FREEZING MIN.<= 0 27 23 21 5 1 0 0 0 0 4 24 29 134 TEMPERATURE RECORDS LOWEST(C) -13.6 -20.0 -13.2 -2.6 -1.2 1.8 7.4 8.2 3.0 -3.0 -9.2 -23.6 -23.6 DAY 28 17 10 14 14 8 31 5 16 23 15 15 MAXIMUM AIR TEMPERATURE (C) 1.6 5.4 10.9 12.0 17.3 24.1 25.3 26.3 27.1 21.1 9.9 -0.3 15.1 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 2 2 12 2 0 0 0 18 DAYS WITH MAXIMUM TEMP. <= 0 12 2 0 0 0 0 0 0 0 0 0 18 32 TEMPERATURE RECORDS HIGHEST(C) 9.6 10.0 17.8 18.8 25.4 31.0 30.8 31.8 30.4 26.6 16.0 6.8 31.8 DAY 3 11 26 28 24 27 17 9 7 1 11 8 DIF. BETWEEN (MAX.-MIN.) (C) 8.7 11.4 12.8 9.0 12.5 16.1 11.7 14.1 20.5 17.1 11.6 9.7 13.0 MEAN DAILY TEMP. (MDT) (C) -2.8 -0.3 4.5 7.5 11.1 16.0 19.5 19.2 16.9 12.5 4.1 -5.2 8.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.9 12.3 5.3 0.0 0.0 0.0 0.0 19.5 HEATING DEG. DAYS(BASE 18 0C) 643.5 512.4 417.1 314.6 215.2 75.1 13.4 13.9 41.8 169.6 417.1 718.1 3551.8 DEWPOINT (MEAN C) -6.6 -6.0 -2.5 1.9 3.7 4.2 8.8 9.2 5.5 3.3 -2.0 -7.7 1.0 MIXING RATIO (G/KG) 2.99 3.12 4.00 5.48 6.17 6.54 8.90 9.18 7.09 6.00 4.15 2.86 5.54 VAPOUR PRESSURE (HPA) 3.92 4.09 5.22 7.13 8.04 8.52 11.57 11.92 9.26 7.86 5.45 3.74 7.23 SATURATION DEF. (HPA) 1.64 2.72 4.45 3.31 6.19 11.65 12.04 11.46 12.28 7.72 2.94 0.87 6.44 RELATIVE HUMIDITY (MEAN %) 73 65 62 72 65 49 53 58 52 60 71 83 64 RELATIVE HUMIDITY (MAX. %) 90 90 89 92 91 74 69 81 86 90 91 94 86 RELATIVE HUMIDITY (MIN. %) 59 47 40 53 42 26 38 37 25 31 46 66 43 RELATIVE HUMIDITY (MEAN% 03UTC) 89 88 86 84 85 65 62 76 85 87 87 89 82 RELATIVE HUMIDITY (MEAN% 09UTC) 61 54 48 59 49 33 41 42 29 34 51 73 48 RELATIVE HUMIDITY (MEAN% 15UTC) 73 62 54 70 54 40 53 51 38 50 68 82 58 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 36.8 31.0 23.1 98.6 49.6 0.1 22.1 0.0 0.0 7.6 74.8 73.3 417.0 DAYS WITH PRECIPITATION >=10 1 1 0 5 1 0 1 0 0 0 3 3 15 DAYS WITH PRECIPITATION >= 5 3 3 2 8 4 0 1 0 0 0 6 5 32 DAYS WITH PRECIPITATION >= 1 4 5 8 16 10 0 6 0 0 2 7 13 71 DAYS WITH PRECIPITATION 8 8 10 21 15 1 7 0 0 6 8 17 101 GREATEST DAILY PRECIPITATION 21.0 10.0 6.1 13.0 11.0 0.1 13.4 0.0 0.0 4.0 21.0 15.0 21.0 DAY 7 12 30 17 5 20 26 ** ** 30 14 21 DAY WITH THUNDER STORM 0 0 1 6 4 0 8 2 0 3 0 0 24 DAYS WITH SNOW OR SLEET 6 3 5 4 0 0 0 0 0 0 6 16 40 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 270 225 225 225 90 90 90 90 90 225 90 90 90 PREVAILING WIND SPEED(KNOTS) 7.1 10.3 10.6 10.9 10.5 9.2 10.7 10.1 9.6 9.9 8.2 11.6 10.1 PREVAILING WIND PERCENT 19.4 22.1 26.7 27.9 19.0 23.8 49.2 44.4 9.6 13.7 9.6 16.1 18.1 CALMS PERCENT OF WIND 49.0 42.1 39.0 32.1 49.2 43.8 29.8 33.9 66.7 60.1 68.3 53.6 47.6 NO. OF WIND OBSERVATION 155 140 187 240 248 240 248 248 240 248 240 248 2682 VECTOR WIND DIRECTION (MEAN) 239 237 229 214 142 120 87 95 164 231 176 111 166 VECTOR WIND MAGNITUDE(KNOTS) 1.8 2.6 3.8 3.8 1.0 1.5 6.1 4.2 0.9 1.8 0.6 1.0 1.1 WIND STEADINESES (MEAN %) 43.9 48.1 62.3 56.7 20.4 27.8 87.1 66.7 32.1 50.0 24.0 21.7 22.4 WIND SPEED (MEAN KNOTS) 4.1 5.4 6.1 6.7 4.9 5.4 7.0 6.3 2.8 3.6 2.5 4.6 4.9 FASTEST WIND DIRECTION 270 200 210 240 80 250 70 70 100 230 220 100 250 FASTEST WIND SPEED (KNOTS) 21 23 27 25 23 29 23 19 16 21 16 25 29 DAY 4 12 27 7 13 6 3 10 14 29 11 10 DAYS WITH SKY CLEAR (0-2)/8 9 14 11 1 12 26 26 27 30 15 16 8 195 DAYS WITH P.CLOUDY (3-6)/8 11 8 10 13 14 4 5 4 0 13 8 5 95 DAYS WITH CLOUDY (7-8)/8 11 6 10 16 5 0 0 0 0 3 6 18 75 DAYS WITH VISIBILITY =< 2 KM 3 0 1 0 2 0 0 0 0 0 2 3 11 DURATION OF SUNSHINE HOURS 137.3 192.5 197.3 161.7 278.8 359.1 361.4 362.4 322.2 226.7 168.8 76.4 2844.6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 820.0 820.7 818.2 816.7 819.1 819.1 820.7 819.5 822.8 823.7 824.3 819.4 820.3 MAX. QFE PRESSURE IN HPA 829.2 830.9 829.6 824.3 825.0 827.1 825.9 825.0 827.4 829.7 832.1 830.7 832.1 DAY-HOUR 27- 6 6- 6 6- 6 1- 6 17- 6 24-12 28-18 30-18 21- 6 10-15 18- 6 3- 6 MIN. QFE PRESSURE IN HPA 809.5 810.0 809.0 806.2 814.6 810.5 813.0 812.4 817.1 816.7 816.7 804.9 804.9 DAY-HOUR 8- 3 26-15 22-12 3-18 4-12 19-15 24-12 7-15 10-15 21-12 12- 0 21- 9 MEAN QNH PRESSURE IN HPA 1018.5 1019.4 1016.5 1014.7 1017.5 1017.5 1019.4 1018.0 1021.9 1023.0 1023.7 1017.9 1019.0 MAX. QNH PRESSURE IN HPA 1029.6 1031.6 1030.0 1023.7 1024.5 1027.1 1025.6 1024.5 1027.4 1030.2 1033.0 1031.3 1033.0 DAY-HOUR 27- 6 6- 6 6- 6 1- 6 17- 6 24-12 28-18 30-18 21- 6 10-15 18- 6 3- 6 MIN. QNH PRESSURE IN HPA 1006.1 1006.7 1005.5 1002.1 1012.1 1007.3 1010.2 1009.5 1015.1 1014.7 1014.7 1000.6 1000.6 DAY-HOUR 8- 3 26-15 22-12 3-18 4-12 19-15 24-12 7-15 10-15 21-12 12- 0 21- 9 MEAN QFF PRESSURE IN HPA ****** ****** 1013.7 1011.2 1011.2 1007.0 1006.7 1005.5 1011.1 1015.9 1023.4 1024.6 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1035.7 1023.7 1022.4 1019.4 1014.7 1016.0 1020.7 1026.7 1036.5 1043.5 ****** DAY-HOUR **-** **-** 10- 3 1- 3 17- 3 24-12 29- 3 31- 3 21- 3 23- 3 18- 3 14-18 MIN. QFF PRESSURE IN HPA ****** ****** 996.7 999.8 1001.2 994.2 996.8 994.8 1002.7 1005.3 1006.7 1000.5 ****** DAY-HOUR **-** **-** 27- 0 3-15 24-15 19-21 24-12 15-21 7-12 29-21 12- 0 21- 9 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** 816.7 819.1 819.2 820.6 819.7 822.9 823.8 824.2 819.5 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** 822.4 824.8 825.6 825.5 824.4 826.4 829.2 831.1 830.4 ****** DAY ** ** ** 1 17 25 29 31 21 11 18 3 MIN. QFE PRESSURE IN HPA ****** ****** ****** 806.9 815.5 811.5 814.7 814.0 818.6 818.1 816.7 806.3 ****** DAY ** ** ** 4 12 20 24 17 11 30 12 21 MEAN QNH PRESSURE IN HPA ****** ****** ****** 1014.6 1017.6 1017.6 1019.3 1018.2 1022.1 1023.2 1023.6 1018.0 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** 1021.4 1024.3 1025.3 1025.1 1023.8 1026.2 1029.6 1031.8 1031.0 ****** DAY ** ** ** 1 17 25 29 31 21 11 18 3 MIN. QNH PRESSURE IN HPA ****** ****** ****** 1003.0 1013.2 1008.5 1012.3 1011.4 1016.9 1016.3 1014.7 1002.3 ****** DAY ** ** ** 4 12 20 24 17 11 30 12 21 MEAN QFF PRESSURE IN HPA ****** ****** ****** 1011.0 1011.2 1007.3 1006.7 1005.4 1010.9 1015.4 1022.5 1024.2 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1021.4 1021.4 1016.9 1014.0 1014.6 1017.5 1025.2 1033.5 1040.2 ****** DAY ** ** ** 1 17 25 29 31 21 23 18 15 MIN. QFF PRESSURE IN HPA ****** ****** ****** 1003.2 1003.1 995.4 997.9 997.6 1006.1 1007.6 1006.7 1001.9 ****** DAY ** ** ** 4 29 20 24 16 11 30 12 21 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 820.0 820.7 819.2 816.8 819.4 819.5 821.0 820.0 823.4 823.9 824.4 819.2 820.6 MAX. QFE PRESSURE IN HPA 828.5 830.2 828.9 823.5 824.8 825.9 825.6 824.4 826.9 829.2 831.1 830.0 831.1 DAY 27 6 11 1 17 25 29 31 21 11 18 3 MIN. QFE PRESSURE IN HPA 809.5 811.5 810.4 807.9 815.5 811.5 814.8 815.1 819.4 818.1 816.9 805.3 805.3 DAY 8 25 21 4 12 20 24 17 11 30 13 21 MEAN QNH PRESSURE IN HPA 1018.5 1019.4 1017.6 1014.8 1017.9 1018.0 1019.8 1018.6 1022.6 1023.2 1023.8 1017.6 1019.3 MAX. QNH PRESSURE IN HPA 1028.7 1030.7 1029.2 1022.8 1024.3 1025.6 1025.3 1023.8 1026.8 1029.6 1031.8 1030.5 1031.8 DAY 27 6 11 1 17 25 29 31 21 11 18 3 MIN. QNH PRESSURE IN HPA 1006.1 1008.5 1007.1 1004.2 1013.2 1008.5 1012.4 1012.7 1017.9 1016.3 1014.9 1001.1 1001.1 DAY 8 25 21 4 12 20 24 17 11 30 13 21 MEAN QFF PRESSURE IN HPA 1024.1 1023.6 1017.7 1012.1 1012.4 1008.2 1008.3 1007.0 1013.7 1017.9 1024.8 1025.2 1016.2 MAX. QFF PRESSURE IN HPA 1035.4 1037.3 1035.7 1023.7 1022.4 1018.0 1014.7 1016.0 1020.7 1026.7 1036.5 1041.3 1041.3 DAY 25 19 10 1 17 25 29 31 21 23 18 15 MIN. QFF PRESSURE IN HPA 1008.3 1007.6 1000.0 1002.2 1004.1 995.6 999.6 999.4 1008.9 1008.9 1009.0 1001.4 995.6 DAY 8 25 27 3 29 20 24 7 11 30 12 21 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 820.7 821.6 819.8 817.2 819.6 819.5 821.1 820.1 823.7 824.6 825.1 820.0 821.1 MAX. QFE PRESSURE IN HPA 829.2 830.9 829.6 824.3 825.0 826.4 825.6 824.8 827.4 829.6 832.1 830.7 832.1 DAY 27 6 6 1 17 24 29 31 21 10 18 3 MIN. QFE PRESSURE IN HPA 810.0 811.8 810.7 808.0 815.8 812.3 814.3 815.1 819.6 819.4 817.2 806.8 806.8 DAY 8 25 22 3 12 20 24 17 10 21 12 21 MEAN QNH PRESSURE IN HPA 1019.4 1020.4 1018.4 1015.2 1018.2 1018.0 1019.9 1018.7 1023.0 1024.1 1024.7 1018.6 1019.9 MAX. QNH PRESSURE IN HPA 1029.6 1031.6 1030.0 1023.7 1024.5 1026.2 1025.3 1024.3 1027.4 1030.0 1033.0 1031.3 1033.0 DAY 27 6 6 1 17 24 29 31 21 10 18 3 MIN. QNH PRESSURE IN HPA 1006.7 1008.8 1007.5 1004.3 1013.6 1009.4 1011.8 1012.7 1018.1 1017.9 1015.2 1002.8 1002.8 DAY 8 25 22 3 12 20 24 17 10 21 12 21 MEAN QFF PRESSURE IN HPA ****** ****** ****** 1011.8 1011.7 1006.8 1007.0 1006.1 1011.7 1016.8 1024.7 1025.9 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1023.0 1021.4 1017.0 1013.9 1015.6 1018.1 1023.6 1035.9 1041.8 ****** DAY ** ** ** 1 17 24 1 31 21 23 18 14 MIN. QFF PRESSURE IN HPA ****** ****** ****** 1001.0 1003.0 997.5 997.6 997.7 1006.3 1010.0 1011.2 1002.8 ****** DAY ** ** ** 3 29 20 24 16 7 3 12 21 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 820.0 821.0 819.1 816.7 819.3 819.1 820.7 819.4 822.8 823.6 824.3 819.3 820.4 MAX. QFE PRESSURE IN HPA 828.2 829.8 829.3 823.8 824.2 826.4 825.5 824.1 827.0 828.8 831.1 829.5 831.1 DAY 27 6 6 1 17 24 29 30 29 10 18 3 MIN. QFE PRESSURE IN HPA 811.0 811.8 810.2 806.9 815.8 812.8 814.0 814.2 818.5 817.6 817.2 804.9 804.9 DAY 8 25 28 3 4 19 24 15 10 21 12 21 MEAN QNH PRESSURE IN HPA 1018.6 1019.8 1017.5 1014.6 1017.7 1017.5 1019.4 1017.9 1022.0 1022.9 1023.7 1017.7 1019.1 MAX. QNH PRESSURE IN HPA 1028.4 1030.3 1029.7 1023.1 1023.6 1026.2 1025.1 1023.5 1026.9 1029.1 1031.8 1029.9 1031.8 DAY 27 6 6 1 17 24 29 30 29 10 18 3 MIN. QNH PRESSURE IN HPA 1007.9 1008.8 1006.9 1003.0 1013.6 1010.0 1011.4 1011.7 1016.8 1015.7 1015.2 1000.6 1000.6 DAY 8 25 28 3 4 19 24 15 10 21 12 21 MEAN QFF PRESSURE IN HPA ****** ****** ****** 1010.7 1011.0 1006.8 1006.0 1004.8 1010.2 1014.8 1022.6 1023.6 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1020.9 1018.1 1017.1 1013.8 1013.6 1015.5 1020.9 1032.6 1037.9 ****** DAY ** ** ** 1 17 24 1 30 21 22 17 14 MIN. QFF PRESSURE IN HPA ****** ****** ****** 999.9 1003.3 998.1 997.1 996.1 1004.4 1008.6 1011.0 1000.5 ****** DAY ** ** ** 3 29 19 24 16 7 21 11 21 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 819.4 820.0 818.1 816.0 818.4 818.3 820.1 818.6 821.9 822.8 823.5 818.8 819.7 MAX. QFE PRESSURE IN HPA 827.3 827.9 828.5 822.2 824.0 827.1 825.0 823.4 826.2 827.6 830.5 829.0 830.5 DAY 27 6 6 1 17 24 29 12 29 10 18 2 MIN. QFE PRESSURE IN HPA 811.8 811.2 809.0 806.5 814.6 811.1 813.0 813.1 817.3 816.7 817.3 804.9 804.9 DAY 8 26 22 3 4 19 24 15 10 21 12 21 MEAN QNH PRESSURE IN HPA 1017.9 1018.6 1016.4 1013.8 1016.7 1016.5 1018.7 1016.9 1020.8 1021.9 1022.8 1017.1 1018.2 MAX. QNH PRESSURE IN HPA 1027.3 1028.0 1028.7 1021.2 1023.4 1027.1 1024.5 1022.6 1026.0 1027.6 1031.1 1029.3 1031.1 DAY 27 6 6 1 17 24 29 12 29 10 18 2 MIN. QNH PRESSURE IN HPA 1008.8 1008.1 1005.5 1002.5 1012.1 1008.0 1010.2 1010.4 1015.4 1014.7 1015.4 1000.6 1000.6 DAY 8 26 22 3 4 19 24 15 10 21 12 21 MEAN QFF PRESSURE IN HPA ****** ****** ****** 1010.1 1010.2 1006.3 1005.7 1004.2 1009.6 1014.3 1021.8 1023.3 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1018.6 1017.9 1019.4 1013.1 1012.8 1016.2 1020.0 1032.4 1038.1 ****** DAY ** ** ** 1 13 24 29 30 29 22 17 14 MIN. QFF PRESSURE IN HPA ****** ****** ****** 1000.9 1002.4 995.5 996.8 995.7 1002.7 1007.8 1009.3 1000.7 ****** DAY ** ** ** 25 24 19 24 15 7 3 11 21 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 819.8 820.2 818.2 816.2 818.4 818.3 820.1 818.5 821.8 823.2 823.8 819.2 819.8 MAX. QFE PRESSURE IN HPA 826.9 828.5 828.5 823.6 823.0 826.5 825.0 823.7 825.8 829.7 830.5 829.6 830.5 DAY 27 5 6 1 17 24 29 12 29 10 18 2 MIN. QFE PRESSURE IN HPA 811.7 810.0 809.8 806.5 814.6 810.5 813.5 812.4 817.1 817.0 817.7 806.9 806.5 DAY 7 26 28 3 19 19 24 7 10 21 12 21 MEAN QNH PRESSURE IN HPA 1018.3 1018.9 1016.5 1014.1 1016.6 1016.6 1018.7 1016.9 1020.8 1022.4 1023.1 1017.7 1018.4 MAX. QNH PRESSURE IN HPA 1026.8 1028.7 1028.7 1022.9 1022.2 1026.3 1024.5 1023.0 1025.5 1030.2 1031.1 1030.0 1031.1 DAY 27 5 6 1 17 24 29 12 29 10 18 2 MIN. QNH PRESSURE IN HPA 1008.7 1006.7 1006.4 1002.5 1012.1 1007.3 1010.8 1009.5 1015.1 1015.0 1015.8 1003.0 1002.5 DAY 7 26 28 3 19 19 24 7 10 21 12 21 MEAN QFF PRESSURE IN HPA 1024.0 1022.9 1016.4 1011.3 1010.9 1006.8 1006.9 1005.3 1011.7 1017.0 1024.2 1025.2 1015.2 MAX. QFF PRESSURE IN HPA 1034.9 1035.8 1034.6 1022.6 1019.5 1016.9 1013.6 1014.8 1018.1 1022.9 1036.2 1043.1 1043.1 DAY 25 18 10 1 13 24 29 29 29 22 17 14 MIN. QFF PRESSURE IN HPA 1008.7 1005.1 1002.9 999.8 1001.2 995.2 999.2 995.7 1005.3 1010.3 1011.2 1005.7 995.2 DAY 7 26 27 3 24 19 23 7 10 3 11 20 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** 817.2 819.4 819.5 821.1 819.8 823.0 824.0 824.4 819.7 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** 823.8 824.7 826.7 825.9 825.0 826.8 829.4 831.4 830.6 ****** DAY ** ** ** 1 16 24 28 30 29 10 18 2 MIN. QFE PRESSURE IN HPA ****** ****** ****** 806.2 816.1 811.5 814.3 813.6 818.0 817.3 817.5 807.7 ****** DAY ** ** ** 3 19 19 24 16 10 29 11 20 MEAN QNH PRESSURE IN HPA ****** ****** ****** 1015.2 1017.9 1018.0 1019.9 1018.4 1022.1 1023.3 1023.9 1018.3 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** 1023.1 1024.2 1026.6 1025.6 1024.5 1026.7 1029.8 1032.2 1031.2 ****** DAY ** ** ** 1 16 24 28 30 29 10 18 2 MIN. QNH PRESSURE IN HPA ****** ****** ****** 1002.1 1013.9 1008.5 1011.8 1011.0 1016.2 1015.4 1015.6 1003.9 ****** DAY ** ** ** 3 19 19 24 16 10 29 11 20 MEAN QFF PRESSURE IN HPA ****** ****** ****** 1011.7 1011.2 1006.9 1006.9 1005.7 1010.8 1016.0 1024.0 1025.5 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1020.6 1022.1 1017.4 1014.2 1016.0 1016.8 1023.9 1035.8 1043.5 ****** DAY ** ** ** 1 13 24 1 30 20 22 17 14 MIN. QFF PRESSURE IN HPA ****** ****** ****** 1000.1 1002.2 994.5 997.0 995.0 1003.7 1007.8 1011.2 1004.7 ****** DAY ** ** ** 3 24 19 24 15 7 29 11 20 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** 817.1 819.4 819.6 821.0 819.9 823.1 823.9 824.4 819.5 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** 823.6 824.7 826.3 825.5 824.8 826.4 829.2 831.4 830.6 ****** DAY ** ** ** 1 16 24 28 30 20 10 18 2 MIN. QFE PRESSURE IN HPA ****** ****** ****** 806.2 816.1 811.5 815.0 814.0 818.0 816.7 816.9 807.3 ****** DAY ** ** ** 3 19 19 24 16 10 29 11 20 MEAN QNH PRESSURE IN HPA ****** ****** ****** 1015.1 1017.8 1018.1 1019.8 1018.5 1022.2 1023.3 1023.9 1018.0 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** 1022.9 1024.2 1026.1 1025.1 1024.3 1026.2 1029.6 1032.2 1031.2 ****** DAY ** ** ** 1 16 24 28 30 20 10 18 2 MIN. QNH PRESSURE IN HPA ****** ****** ****** 1002.1 1013.9 1008.5 1012.6 1011.4 1016.2 1014.7 1014.9 1003.4 ****** DAY ** ** ** 3 19 19 24 16 10 29 11 20 MEAN QFF PRESSURE IN HPA ****** ****** ****** 1011.2 1010.9 1007.4 1006.4 1005.5 1010.5 1015.1 1022.9 1024.1 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1018.4 1021.4 1018.4 1013.8 1014.7 1016.5 1024.3 1033.5 1039.5 ****** DAY ** ** ** 1 13 24 1 30 20 22 17 14 MIN. QFF PRESSURE IN HPA ****** ****** ****** 1000.1 1002.5 994.2 998.8 994.8 1004.7 1005.3 1010.3 1003.1 ****** DAY ** ** ** 3 19 19 24 15 10 29 11 20 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -2.3 -1.7 0.7 8.2 11.6 15.5 19.4 20.0 15.5 12.5 2.8 -1.9 8.4 MINIMUN AIR TEMPERATURE (C) -6.7 -5.2 -3.6 2.9 4.2 8.5 13.7 14.1 9.2 4.5 -2.4 -5.6 2.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 22 16 10 3 0 0 0 0 0 0 13 14 78 DAYS WITH FREEZING MIN.<= 0 27 26 26 9 3 0 0 0 0 0 23 27 141 TEMPERATURE RECORDS LOWEST(C) -20.0 -13.0 -17.6 -5.0 -2.0 0.4 7.6 8.6 3.4 0.6 -9.6 -21.8 -21.8 DAY 20 24 2 29 9 26 2 26 28 22 15 12 MAXIMUM AIR TEMPERATURE (C) 2.1 2.2 5.6 13.6 18.4 21.9 25.0 26.2 22.1 20.7 9.1 2.8 14.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 0 6 6 2 0 0 0 14 DAYS WITH MAXIMUM TEMP. <= 0 8 5 3 1 0 0 0 0 0 0 0 4 21 TEMPERATURE RECORDS HIGHEST(C) 7.8 7.8 11.0 22.6 23.2 28.6 33.4 34.0 30.2 25.6 17.6 10.2 34.0 DAY 12 8 25 6 16 22 13 12 5 11 5 18 DIF. BETWEEN (MAX.-MIN.) (C) 8.8 7.4 9.2 10.7 14.2 13.4 11.3 12.1 12.9 16.2 11.5 8.4 11.4 MEAN DAILY TEMP. (MDT) (C) -2.3 -1.5 1.0 8.3 11.3 15.2 19.4 20.2 15.6 12.6 3.4 -1.4 8.5 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.0 16.8 15.2 0.0 0.0 0.0 0.0 32.0 HEATING DEG. DAYS(BASE 18 0C) 629.3 545.2 526.2 291.9 208.0 90.2 13.5 3.3 82.9 168.1 438.6 602.1 3599.3 DEWPOINT (MEAN C) -5.8 -5.4 -3.6 -0.1 2.9 7.7 9.3 8.2 5.5 3.6 -1.8 -5.0 1.3 MIXING RATIO (G/KG) 3.12 3.23 3.72 4.78 6.06 8.24 9.25 8.54 7.07 6.12 4.26 3.45 5.65 VAPOUR PRESSURE (HPA) 4.10 4.21 4.86 6.25 7.92 10.70 11.98 11.12 9.24 8.01 5.59 4.53 7.38 SATURATION DEF. (HPA) 1.36 1.38 1.91 5.49 6.57 7.87 11.37 13.26 9.47 7.48 2.37 1.15 5.81 RELATIVE HUMIDITY (MEAN %) 79 78 75 60 60 63 56 50 57 59 75 81 66 RELATIVE HUMIDITY (MAX. %) 92 94 93 81 83 82 75 69 78 88 94 94 85 RELATIVE HUMIDITY (MIN. %) 63 59 54 43 37 44 40 33 37 34 52 63 47 RELATIVE HUMIDITY (MEAN% 03UTC) 88 86 85 74 76 75 67 62 73 83 87 90 79 RELATIVE HUMIDITY (MEAN% 09UTC) 67 68 66 49 40 51 44 37 41 38 56 67 52 RELATIVE HUMIDITY (MEAN% 15UTC) 76 75 67 53 54 55 51 49 53 50 73 80 61 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 38.6 48.1 61.0 82.0 77.1 13.3 3.0 4.5 0.1 17.6 47.1 49.7 442.1 DAYS WITH PRECIPITATION >=10 1 1 1 2 2 0 0 0 0 0 2 2 11 DAYS WITH PRECIPITATION >= 5 3 5 5 6 5 2 0 0 0 1 4 3 34 DAYS WITH PRECIPITATION >= 1 5 11 12 9 12 3 1 1 0 5 6 9 74 DAYS WITH PRECIPITATION 10 17 17 13 17 4 2 4 1 7 10 18 120 GREATEST DAILY PRECIPITATION 17.8 10.1 12.1 20.2 23.0 5.0 3.0 3.7 0.1 7.0 15.0 16.8 23.0 DAY 15 4 26 27 22 5 7 22 18 30 9 19 DAY WITH THUNDER STORM 0 1 2 5 12 2 1 3 0 4 2 0 32 DAYS WITH SNOW OR SLEET 10 17 11 5 0 0 0 0 0 0 6 18 67 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 270 225 225 225 90 90 90 90 90 225 225 225 90 PREVAILING WIND SPEED(KNOTS) 8.0 9.6 9.5 12.3 10.2 9.9 10.5 10.0 9.4 9.5 9.9 9.9 9.8 PREVAILING WIND PERCENT 14.9 19.6 17.7 23.3 18.5 30.0 45.6 49.6 43.3 20.2 11.3 14.1 21.2 CALMS PERCENT OF WIND 50.8 43.3 43.1 25.4 48.0 40.8 25.0 25.4 34.2 56.0 55.4 49.2 41.4 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 267 222 204 206 123 99 89 92 95 226 175 208 138 VECTOR WIND MAGNITUDE(KNOTS) 1.6 2.3 2.3 3.2 1.4 2.7 5.7 5.9 4.1 2.9 1.3 1.1 1.4 WIND STEADINESES (MEAN %) 38.1 46.0 46.0 41.0 28.6 50.0 80.3 84.3 69.5 70.7 34.2 23.9 25.9 WIND SPEED (MEAN KNOTS) 4.2 5.0 5.0 7.8 4.9 5.4 7.1 7.0 5.9 4.1 3.8 4.6 5.4 FASTEST WIND DIRECTION 230 310 200 210 150 270 70 90 80 190 180 220 210 FASTEST WIND SPEED (KNOTS) 19 16 25 29 27 25 25 17 19 19 23 23 29 DAY 7 1 20 6 22 1 23 13 7 3 10 19 DAYS WITH SKY CLEAR (0-2)/8 9 5 7 4 18 25 27 29 23 16 13 8 184 DAYS WITH P.CLOUDY (3-6)/8 9 8 11 11 8 5 4 2 7 13 10 14 102 DAYS WITH CLOUDY (7-8)/8 13 15 13 15 5 0 0 0 0 2 7 9 79 DAYS WITH VISIBILITY =< 2 KM 2 7 3 5 1 0 0 0 0 1 3 4 26 DURATION OF SUNSHINE HOURS 127.5 123.3 143.8 177.8 271.6 355.8 362.8 357.7 319.6 243.2 166.2 115.4 2764.7 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 820.2 816.1 817.3 819.5 821.9 819.3 818.1 821.5 822.1 822.5 823.4 822.6 820.4 MAX. QFE PRESSURE IN HPA 828.1 824.0 827.8 827.7 828.9 825.4 824.2 825.4 829.5 829.4 832.1 833.1 833.1 DAY-HOUR 12- 6 28-18 2- 6 30-21 1- 9 5-18 3-18 30- 6 22-18 15- 6 25- 6 11-18 MIN. QFE PRESSURE IN HPA 805.3 803.2 804.2 811.5 815.6 814.5 812.5 817.3 815.2 814.1 815.8 810.8 803.2 DAY-HOUR 28-12 19- 3 26- 9 21- 0 7- 9 22-15 8-15 14-12 6-15 28-21 9-15 6-12 MEAN QNH PRESSURE IN HPA 1018.9 1013.9 1015.3 1017.9 1020.8 1017.7 1016.3 1020.4 1021.1 1021.5 1022.6 1021.6 1019.0 MAX. QNH PRESSURE IN HPA 1028.2 1023.4 1027.9 1027.8 1029.2 1025.0 1023.6 1025.0 1029.9 1029.8 1033.0 1034.2 1034.2 DAY-HOUR 12- 6 28-18 2- 6 30-21 1- 9 5-18 3-18 30- 6 22-18 15- 6 25- 6 11-18 MIN. QNH PRESSURE IN HPA 1001.1 998.5 999.7 1008.5 1013.3 1012.0 1009.6 1015.4 1012.9 1011.6 1013.6 1007.6 998.5 DAY-HOUR 28-12 19- 3 26- 9 21- 0 7- 9 22-15 8-15 14-12 6-15 28-21 9-15 6-12 MEAN QFF PRESSURE IN HPA 1023.3 1017.5 1017.2 1014.0 1014.2 1007.9 1003.6 1007.4 1011.5 1014.2 1022.9 1025.8 1015.0 MAX. QFF PRESSURE IN HPA 1034.8 1032.4 1039.7 1028.8 1027.9 1022.4 1012.6 1013.9 1024.9 1023.7 1037.6 1046.5 1046.5 DAY-HOUR 18- 6 28-21 2- 3 29- 3 1- 9 6- 6 21-18 16- 6 22-18 15- 3 25- 6 11-18 MIN. QFF PRESSURE IN HPA 1004.8 1001.0 997.3 1000.0 1004.0 997.6 993.6 1000.0 998.1 1001.5 1008.9 1005.3 993.6 DAY-HOUR 28-12 20-12 26- 9 26-12 29-12 22-15 8-15 14-12 6-12 28-21 9-18 19- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 820.2 815.7 816.9 819.1 821.9 819.4 818.1 821.5 822.2 822.5 823.1 822.4 820.2 MAX. QFE PRESSURE IN HPA 827.6 821.8 826.2 824.4 827.6 824.4 823.4 824.2 828.6 827.8 830.3 831.1 831.1 DAY 12 7 2 30 1 6 4 4 23 15 26 12 MIN. QFE PRESSURE IN HPA 809.6 803.4 808.7 811.5 817.1 815.3 814.8 818.6 817.5 814.1 816.2 812.5 803.4 DAY 29 19 27 21 29 27 8 1 18 29 10 19 MEAN QNH PRESSURE IN HPA 1018.8 1013.5 1014.9 1017.5 1020.8 1017.9 1016.4 1020.4 1021.2 1021.5 1022.3 1021.5 1018.9 MAX. QNH PRESSURE IN HPA 1027.6 1020.7 1026.0 1023.8 1027.6 1023.8 1022.6 1023.6 1028.8 1027.9 1030.9 1031.8 1031.8 DAY 12 7 2 30 1 6 4 4 23 15 26 12 MIN. QNH PRESSURE IN HPA 1006.2 998.8 1005.1 1008.5 1015.1 1013.0 1012.4 1016.9 1015.6 1011.6 1014.1 1009.6 998.8 DAY 29 19 27 21 29 27 8 1 18 29 10 19 MEAN QFF PRESSURE IN HPA 1022.8 1016.5 1016.3 1013.3 1014.5 1008.2 1003.6 1007.1 1011.1 1013.7 1022.0 1025.2 1014.5 MAX. QFF PRESSURE IN HPA 1032.3 1025.9 1037.0 1028.2 1026.4 1019.8 1011.0 1011.9 1022.9 1019.8 1033.6 1045.4 1045.4 DAY 20 24 2 29 1 6 22 16 23 16 25 12 MIN. QFF PRESSURE IN HPA 1009.3 1002.4 1001.3 1000.5 1005.5 1000.0 998.0 1002.6 1001.8 1001.5 1010.0 1005.3 998.0 DAY 29 19 26 26 31 23 18 13 7 27 10 19 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 820.2 815.9 817.1 819.3 822.1 819.7 818.5 821.9 822.5 822.8 823.4 822.3 820.5 MAX. QFE PRESSURE IN HPA 827.6 821.8 826.6 824.8 827.6 824.6 823.8 825.0 828.6 828.6 830.1 830.3 830.3 DAY 12 6 2 30 1 6 3 30 23 15 26 11 MIN. QFE PRESSURE IN HPA 810.7 803.2 808.3 812.3 816.2 815.6 815.1 819.4 817.3 814.1 816.0 812.5 803.2 DAY 28 19 26 20 29 22 8 1 18 29 9 19 MEAN QNH PRESSURE IN HPA 1018.8 1013.7 1015.2 1017.7 1021.1 1018.2 1016.8 1020.9 1021.6 1021.9 1022.6 1021.3 1019.2 MAX. QNH PRESSURE IN HPA 1027.6 1020.7 1026.5 1024.3 1027.6 1024.1 1023.1 1024.5 1028.8 1028.8 1030.6 1030.9 1030.9 DAY 12 6 2 30 1 6 3 30 23 15 26 11 MIN. QNH PRESSURE IN HPA 1007.5 998.5 1004.6 1009.4 1014.1 1013.3 1012.7 1017.9 1015.4 1011.6 1013.8 1009.6 998.5 DAY 28 19 26 20 29 22 8 1 18 29 9 19 MEAN QFF PRESSURE IN HPA 1024.1 1017.8 1017.7 1014.5 1015.8 1009.0 1004.9 1009.0 1013.3 1016.1 1024.1 1026.3 1016.1 MAX. QFF PRESSURE IN HPA 1033.0 1028.2 1039.7 1028.8 1025.7 1022.2 1011.5 1013.4 1024.6 1023.7 1037.5 1046.1 1046.1 DAY 20 24 2 29 1 6 22 16 23 15 25 12 MIN. QFF PRESSURE IN HPA 1011.2 1001.5 1000.3 1001.8 1006.6 1000.9 999.5 1004.4 1002.6 1002.2 1010.8 1006.2 999.5 DAY 28 20 26 26 29 22 7 27 7 29 9 19 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 821.0 816.7 817.8 819.9 822.3 819.7 818.6 822.1 822.8 823.4 824.3 823.3 821.0 MAX. QFE PRESSURE IN HPA 828.1 823.4 827.8 825.3 828.8 824.6 823.6 825.4 828.8 829.4 832.1 831.8 832.1 DAY 12 12 2 30 1 6 3 30 22 15 25 11 MIN. QFE PRESSURE IN HPA 809.1 803.9 806.2 812.9 815.8 816.1 815.1 819.6 817.7 815.1 816.2 814.3 803.9 DAY 28 19 26 20 29 22 8 22 18 27 9 6 MEAN QNH PRESSURE IN HPA 1019.8 1014.6 1016.0 1018.5 1021.3 1018.3 1016.9 1021.1 1022.0 1022.7 1023.7 1022.5 1019.8 MAX. QNH PRESSURE IN HPA 1028.2 1022.6 1027.9 1024.9 1029.1 1024.1 1022.9 1025.0 1029.1 1029.8 1033.0 1032.7 1033.0 DAY 12 12 2 30 1 6 3 30 22 15 25 11 MIN. QNH PRESSURE IN HPA 1005.6 999.4 1002.1 1010.1 1013.6 1013.9 1012.7 1018.1 1015.8 1012.7 1014.1 1011.8 999.4 DAY 28 19 26 20 29 22 8 22 18 27 9 6 MEAN QFF PRESSURE IN HPA 1024.9 1018.5 1018.2 1014.5 1014.1 1008.2 1004.4 1008.1 1012.2 1015.2 1024.2 1027.1 1015.8 MAX. QFF PRESSURE IN HPA 1034.8 1029.0 1039.6 1028.6 1027.8 1022.4 1011.6 1013.9 1023.3 1022.8 1037.6 1046.2 1046.2 DAY 18 28 2 29 1 6 21 16 23 23 25 12 MIN. QFF PRESSURE IN HPA 1009.0 1001.4 999.4 1002.1 1006.7 1000.7 997.0 1003.7 1000.8 1002.4 1010.6 1011.3 997.0 DAY 28 20 26 6 31 27 7 10 6 27 9 19 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 820.4 816.4 817.6 819.6 821.8 819.3 818.0 821.5 822.2 822.5 823.4 822.5 820.4 MAX. QFE PRESSURE IN HPA 826.7 823.9 827.5 825.7 828.9 824.1 823.6 824.7 829.0 829.2 830.8 831.8 831.8 DAY 11 12 2 30 1 6 3 30 22 15 25 11 MIN. QFE PRESSURE IN HPA 806.9 803.9 804.2 812.7 815.6 815.3 813.9 818.6 817.3 814.8 816.0 812.3 803.9 DAY 28 19 26 20 7 22 8 14 18 27 9 6 MEAN QNH PRESSURE IN HPA 1019.0 1014.3 1015.7 1018.1 1020.8 1017.8 1016.2 1020.4 1021.2 1021.6 1022.6 1021.5 1019.1 MAX. QNH PRESSURE IN HPA 1026.6 1023.2 1027.5 1025.4 1029.2 1023.5 1022.9 1024.2 1029.3 1029.6 1031.5 1032.7 1032.7 DAY 11 12 2 30 1 6 3 30 22 15 25 11 MIN. QNH PRESSURE IN HPA 1003.0 999.4 999.7 1009.9 1013.3 1013.0 1011.3 1016.9 1015.4 1012.4 1013.8 1009.4 999.4 DAY 28 19 26 20 7 22 8 14 18 27 9 6 MEAN QFF PRESSURE IN HPA 1022.7 1017.5 1017.5 1013.7 1013.4 1007.7 1003.1 1006.8 1010.8 1013.3 1022.1 1025.0 1014.5 MAX. QFF PRESSURE IN HPA 1029.7 1028.4 1038.1 1027.6 1027.9 1020.1 1009.8 1012.1 1023.5 1019.8 1033.6 1041.7 1041.7 DAY 11 28 2 29 1 6 22 3 22 15 25 12 MIN. QFF PRESSURE IN HPA 1007.2 1001.1 997.3 1000.2 1005.5 998.8 995.7 1001.7 999.8 1001.7 1012.4 1009.6 995.7 DAY 28 19 26 6 31 22 8 14 6 27 9 18 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 819.7 815.6 816.8 818.8 821.0 818.5 817.3 820.7 821.2 821.6 822.8 821.9 819.7 MAX. QFE PRESSURE IN HPA 826.7 822.8 826.1 825.4 828.1 823.2 823.4 823.7 828.4 827.8 830.3 831.9 831.9 DAY 11 12 2 30 1 6 3 30 22 15 25 11 MIN. QFE PRESSURE IN HPA 805.3 803.9 805.5 811.7 815.6 814.8 813.0 817.3 816.0 814.5 816.0 810.8 803.9 DAY 28 19 26 20 29 30 8 14 6 27 9 6 MEAN QNH PRESSURE IN HPA 1018.3 1013.4 1014.7 1017.2 1019.8 1016.9 1015.4 1019.5 1020.0 1020.5 1021.9 1020.8 1018.2 MAX. QNH PRESSURE IN HPA 1026.6 1021.9 1025.9 1025.0 1028.2 1022.4 1022.6 1023.0 1028.6 1027.9 1030.9 1032.8 1032.8 DAY 11 12 2 30 1 6 3 30 22 15 25 11 MIN. QNH PRESSURE IN HPA 1001.1 999.4 1001.3 1008.7 1013.3 1012.4 1010.2 1015.4 1013.8 1012.0 1013.8 1007.6 999.4 DAY 28 19 26 20 29 30 8 14 6 27 9 6 MEAN QFF PRESSURE IN HPA 1022.1 1016.5 1016.0 1012.9 1013.2 1006.9 1002.4 1006.1 1009.9 1012.7 1021.7 1024.5 1013.7 MAX. QFF PRESSURE IN HPA 1029.0 1028.2 1036.3 1026.2 1026.8 1017.7 1009.8 1011.4 1021.9 1019.4 1033.0 1041.3 1041.3 DAY 11 28 2 29 1 6 21 3 22 15 25 11 MIN. QFF PRESSURE IN HPA 1004.8 1001.0 1000.0 1000.0 1004.0 998.5 995.0 1000.0 998.1 1001.7 1012.8 1009.0 995.0 DAY 28 20 19 26 29 22 8 14 6 27 10 6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 820.0 816.0 817.0 819.2 821.5 818.5 817.3 820.8 821.3 821.8 823.2 822.5 819.9 MAX. QFE PRESSURE IN HPA 826.8 823.4 825.9 826.5 827.5 822.8 823.4 823.8 828.9 827.8 831.1 832.3 832.3 DAY 11 28 2 30 1 6 3 3 22 15 25 11 MIN. QFE PRESSURE IN HPA 805.7 804.9 807.5 811.7 816.5 814.5 812.5 817.6 815.2 814.6 815.8 812.4 804.9 DAY 28 19 26 20 30 22 8 14 6 28 9 6 MEAN QNH PRESSURE IN HPA 1018.6 1013.8 1015.0 1017.6 1020.4 1016.8 1015.4 1019.5 1020.1 1020.7 1022.4 1021.6 1018.5 MAX. QNH PRESSURE IN HPA 1026.7 1022.6 1025.6 1026.3 1027.5 1021.9 1022.6 1023.1 1029.2 1027.9 1031.8 1033.2 1033.2 DAY 11 28 2 30 1 6 3 3 22 15 25 11 MIN. QNH PRESSURE IN HPA 1001.5 1000.6 1003.7 1008.7 1014.4 1012.0 1009.6 1015.7 1012.9 1012.1 1013.6 1009.5 1000.6 DAY 28 19 26 20 30 22 8 14 6 28 9 6 MEAN QFF PRESSURE IN HPA 1023.7 1018.0 1017.4 1014.3 1015.0 1007.4 1003.2 1007.4 1011.7 1014.9 1023.9 1026.6 1015.3 MAX. QFF PRESSURE IN HPA 1031.9 1030.7 1038.1 1026.9 1025.5 1018.0 1011.3 1012.2 1024.5 1022.3 1037.4 1045.7 1045.7 DAY 11 28 2 30 1 6 3 19 22 15 25 12 MIN. QFF PRESSURE IN HPA 1005.0 1002.2 1002.4 1002.0 1006.1 997.6 993.6 1001.6 1000.0 1004.1 1010.9 1011.4 993.6 DAY 28 19 19 20 30 22 8 14 6 28 9 6 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 820.3 816.2 817.6 820.0 822.3 819.7 818.4 821.9 822.4 822.6 823.5 822.9 820.7 MAX. QFE PRESSURE IN HPA 827.6 824.0 825.8 827.5 828.5 825.4 824.2 824.9 829.5 828.8 831.1 833.1 833.1 DAY 11 28 2 30 1 5 3 3 22 15 25 11 MIN. QFE PRESSURE IN HPA 807.0 805.6 808.1 812.1 817.7 815.2 814.6 819.0 817.2 814.4 816.1 813.8 805.6 DAY 28 19 26 20 30 30 8 14 6 28 19 6 MEAN QNH PRESSURE IN HPA 1019.0 1014.1 1015.7 1018.6 1021.4 1018.3 1016.7 1020.9 1021.4 1021.7 1022.8 1022.1 1019.4 MAX. QNH PRESSURE IN HPA 1027.6 1023.4 1025.5 1027.5 1028.7 1025.0 1023.6 1024.4 1029.9 1029.1 1031.8 1034.2 1034.2 DAY 11 28 2 30 1 5 3 3 22 15 25 11 MIN. QNH PRESSURE IN HPA 1003.1 1001.4 1004.4 1009.2 1015.8 1012.9 1012.1 1017.4 1015.2 1011.9 1013.9 1011.2 1001.4 DAY 28 19 26 20 30 30 8 14 6 28 19 6 MEAN QFF PRESSURE IN HPA 1024.0 1018.1 1017.7 1014.6 1014.0 1008.2 1004.1 1007.8 1011.7 1014.3 1023.3 1026.7 1015.4 MAX. QFF PRESSURE IN HPA 1033.8 1032.3 1037.4 1027.7 1026.7 1020.1 1012.6 1013.2 1024.9 1020.7 1035.5 1046.5 1046.5 DAY 18 28 1 28 1 5 21 3 22 15 25 11 MIN. QFF PRESSURE IN HPA 1006.4 1002.4 1005.3 1002.6 1005.9 999.3 997.3 1003.2 999.6 1003.6 1008.9 1009.0 997.3 DAY 28 19 26 20 30 22 6 12 6 28 9 18 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 820.2 816.1 817.4 819.9 822.1 819.6 818.5 821.9 822.3 822.7 823.5 822.7 820.6 MAX. QFE PRESSURE IN HPA 827.6 823.8 825.6 827.7 827.7 824.4 824.0 824.6 829.5 829.2 830.7 832.1 832.1 DAY 11 28 1 30 1 5 3 3 22 15 25 11 MIN. QFE PRESSURE IN HPA 808.4 804.2 808.5 812.1 817.0 815.0 815.0 819.3 817.6 814.1 816.3 813.9 804.2 DAY 28 18 26 20 28 21 8 26 6 28 19 18 MEAN QNH PRESSURE IN HPA 1018.8 1013.9 1015.5 1018.5 1021.1 1018.1 1016.8 1020.9 1021.4 1021.8 1022.7 1021.8 1019.3 MAX. QNH PRESSURE IN HPA 1027.6 1023.1 1025.3 1027.8 1027.8 1023.8 1023.4 1024.1 1029.9 1029.6 1031.3 1033.0 1033.0 DAY 11 28 1 30 1 5 3 3 22 15 25 11 MIN. QNH PRESSURE IN HPA 1004.8 999.7 1004.9 1009.2 1015.0 1012.6 1012.6 1017.8 1015.7 1011.6 1014.2 1011.3 999.7 DAY 28 18 26 20 28 21 8 26 6 28 19 18 MEAN QFF PRESSURE IN HPA 1022.4 1017.3 1017.1 1014.1 1013.7 1008.1 1003.6 1007.4 1011.2 1013.5 1022.3 1025.4 1014.7 MAX. QFF PRESSURE IN HPA 1031.7 1032.4 1036.0 1028.0 1025.4 1019.0 1010.5 1012.6 1024.6 1020.8 1033.5 1046.0 1046.0 DAY 19 28 1 28 1 5 21 3 22 15 22 11 MIN. QFF PRESSURE IN HPA 1007.4 1003.1 1003.3 1001.6 1005.8 999.9 997.2 1001.9 1001.5 1001.5 1011.7 1006.7 997.2 DAY 28 19 25 20 28 21 17 12 6 28 9 18 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -0.7 0.4 4.4 6.4 11.6 17.2 17.8 20.3 15.1 10.0 3.7 -3.7 8.5 MINIMUN AIR TEMPERATURE (C) -3.8 -3.9 -2.1 -0.1 5.9 10.2 12.2 14.0 7.2 2.5 -0.5 -8.5 2.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 10 12 11 10 0 0 0 0 0 0 7 28 78 DAYS WITH FREEZING MIN.<= 0 29 25 24 16 0 0 0 0 1 7 14 31 147 TEMPERATURE RECORDS LOWEST(C) -11.6 -12.0 -10.6 -11.2 1.0 4.0 6.0 8.4 0.0 -3.4 -12.6 -18.8 -18.8 DAY 21 24 17 6 24 15 1 28 21 25 30 19 MAXIMUM AIR TEMPERATURE (C) 3.1 5.2 11.1 12.9 17.4 23.8 23.9 26.6 22.7 18.5 8.6 2.0 14.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 1 0 5 2 0 0 0 8 DAYS WITH MAXIMUM TEMP. <= 0 1 1 4 1 0 0 0 0 0 0 1 8 16 TEMPERATURE RECORDS HIGHEST(C) 6.2 14.2 22.4 21.0 24.2 30.0 29.0 32.6 31.6 24.6 17.0 9.6 32.6 DAY 23 29 6 14 10 20 22 11 10 1 1 31 DIF. BETWEEN (MAX.-MIN.) (C) 6.9 9.1 13.2 13.0 11.5 13.6 11.7 12.6 15.5 16.0 9.1 10.5 11.9 MEAN DAILY TEMP. (MDT) (C) -0.3 0.7 4.5 6.4 11.6 17.0 18.1 20.3 15.0 10.5 4.0 -3.2 8.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 3.5 1.6 10.5 1.6 0.0 0.0 0.0 17.2 HEATING DEG. DAYS(BASE 18 0C) 568.0 502.9 418.0 348.1 199.0 55.3 27.5 0.3 101.4 232.3 419.1 658.4 3530.3 DEWPOINT (MEAN C) -4.4 -4.9 -3.9 -1.1 4.8 6.8 9.7 9.8 4.4 2.3 -0.0 -7.5 1.3 MIXING RATIO (G/KG) 3.48 3.35 3.61 4.51 6.68 7.74 9.39 9.52 6.74 5.62 4.98 2.76 5.70 VAPOUR PRESSURE (HPA) 4.55 4.38 4.74 5.89 8.70 10.08 12.19 12.35 8.81 7.39 6.53 3.62 7.44 SATURATION DEF. (HPA) 1.38 2.18 4.79 4.70 5.60 10.56 8.88 12.43 9.79 5.88 1.88 1.29 5.78 RELATIVE HUMIDITY (MEAN %) 78 71 62 64 67 55 63 54 56 65 80 78 66 RELATIVE HUMIDITY (MAX. %) 93 91 86 89 88 79 84 77 81 92 96 94 88 RELATIVE HUMIDITY (MIN. %) 61 50 39 39 45 35 43 37 34 36 58 54 44 RELATIVE HUMIDITY (MEAN% 03UTC) 86 82 82 83 81 69 77 67 78 88 91 91 81 RELATIVE HUMIDITY (MEAN% 09UTC) 68 57 45 47 52 40 47 40 37 40 66 58 50 RELATIVE HUMIDITY (MEAN% 15UTC) 73 64 52 53 60 47 60 52 49 56 77 74 60 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 23.9 26.1 29.3 71.0 81.3 23.8 38.1 0.1 0.8 25.1 119.2 9.2 447.9 DAYS WITH PRECIPITATION >=10 0 0 1 2 2 1 2 0 0 1 5 0 14 DAYS WITH PRECIPITATION >= 5 1 1 1 5 6 2 3 0 0 2 7 1 29 DAYS WITH PRECIPITATION >= 1 7 7 3 8 11 2 6 0 0 3 9 1 57 DAYS WITH PRECIPITATION 15 13 8 11 19 5 8 2 1 4 16 5 107 GREATEST DAILY PRECIPITATION 7.3 9.0 22.6 24.0 24.0 17.0 14.0 0.1 0.8 14.0 28.6 8.6 28.6 DAY 3 11 31 16 13 22 11 29 19 14 18 12 DAY WITH THUNDER STORM 0 2 0 3 13 3 8 1 0 2 1 0 33 DAYS WITH SNOW OR SLEET 15 13 7 3 0 0 0 0 0 0 4 7 49 DAYS WITH DUST 1 1 0 0 0 0 0 0 0 0 0 0 2 WIND DIRECTION (PREVAILING) 270 225 225 225 90 90 90 90 90 90 225 90 90 PREVAILING WIND SPEED(KNOTS) 8.1 10.5 13.3 10.8 10.2 10.2 11.0 11.1 11.9 11.5 10.8 10.8 10.8 PREVAILING WIND PERCENT 18.5 28.9 18.1 18.8 13.7 36.3 46.4 44.0 37.5 12.5 12.9 13.3 20.3 CALMS PERCENT OF WIND 47.2 37.1 37.9 37.9 40.7 31.3 28.2 32.3 40.0 59.7 55.0 62.1 42.5 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 247 235 196 182 179 98 92 90 90 153 229 100 133 VECTOR WIND MAGNITUDE(KNOTS) 3.1 4.8 1.4 1.9 1.5 4.0 5.6 5.9 4.7 0.8 2.1 0.9 1.4 WIND STEADINESES (MEAN %) 67.4 78.7 20.9 32.8 26.8 60.6 78.9 83.1 71.2 20.0 55.3 27.3 25.0 WIND SPEED (MEAN KNOTS) 4.6 6.1 6.7 5.8 5.6 6.6 7.1 7.1 6.6 4.0 3.8 3.3 5.6 FASTEST WIND DIRECTION 210 230 240 210 190 80 80 70 80 80 210 70 240 FASTEST WIND SPEED (KNOTS) 23 29 39 27 23 23 21 23 23 19 29 19 39 DAY 8 15 6 23 11 29 20 16 12 5 22 16 DAYS WITH SKY CLEAR (0-2)/8 6 7 7 12 8 25 23 27 25 23 7 12 182 DAYS WITH P.CLOUDY (3-6)/8 14 11 15 9 14 4 7 4 5 5 11 10 109 DAYS WITH CLOUDY (7-8)/8 11 11 9 9 9 1 1 0 0 3 12 9 75 DAYS WITH VISIBILITY =< 2 KM 1 0 0 1 0 0 0 0 0 0 2 2 6 DURATION OF SUNSHINE HOURS 123.0 158.7 200.6 225.0 240.8 354.4 345.3 351.1 295.4 251.0 117.5 155.3 2818.1 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 817.1 818.3 821.6 818.8 818.7 820.1 820.2 819.8 824.2 825.5 821.5 821.0 820.6 MAX. QFE PRESSURE IN HPA 824.3 825.0 831.4 827.0 825.1 826.3 825.6 823.6 829.3 830.6 827.1 830.5 831.4 DAY-HOUR 1- 0 29- 6 8-21 12- 6 26-18 13- 6 18- 6 17- 6 28- 6 27- 6 12- 6 3- 6 MIN. QFE PRESSURE IN HPA 808.2 806.6 813.7 810.5 807.5 815.3 814.3 812.1 816.5 815.8 808.1 813.0 806.6 DAY-HOUR 23-18 15-12 31- 0 3- 9 15-12 9-15 23-12 3-15 5-15 22- 0 23- 9 15-12 MEAN QNH PRESSURE IN HPA 1015.1 1016.5 1020.5 1017.1 1017.0 1018.7 1018.8 1018.3 1023.5 1025.1 1020.4 1019.8 1019.3 MAX. QNH PRESSURE IN HPA 1023.7 1024.5 1032.2 1026.9 1024.7 1026.1 1025.3 1022.9 1029.7 1031.2 1027.1 1031.1 1032.2 DAY-HOUR 1- 0 29- 6 8-21 12- 6 26-18 13- 6 18- 6 17- 6 28- 6 27- 6 12- 6 3- 6 MIN. QNH PRESSURE IN HPA 1004.5 1002.6 1011.1 1007.3 1003.7 1013.0 1011.8 1009.2 1014.4 1013.6 1004.4 1010.2 1002.6 DAY-HOUR 23-18 15-12 31- 0 3- 9 15-12 9-15 23-12 3-15 5-15 22- 0 23- 9 15-12 MEAN QFF PRESSURE IN HPA 1018.1 1018.8 1019.6 1014.6 1010.2 1007.7 1007.3 1005.0 1014.3 1019.9 1019.8 1025.5 1015.1 MAX. QFF PRESSURE IN HPA 1031.3 1028.5 1038.6 1028.9 1019.3 1019.9 1015.1 1012.1 1025.9 1030.3 1034.6 1041.2 1041.2 DAY-HOUR 1- 3 24- 3 8-21 6- 3 22- 9 13- 6 6- 3 28- 3 21- 3 27- 3 30- 3 3- 6 MIN. QFF PRESSURE IN HPA 1003.5 1002.1 1001.4 1000.3 996.6 1000.1 998.5 994.1 1000.9 1003.2 1001.6 1014.3 994.1 DAY-HOUR 23-21 15-12 6-12 3-12 15-12 24-12 23-12 3-18 5-21 22- 0 23- 0 12- 3 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 817.1 818.0 821.5 818.7 818.5 820.1 820.2 819.7 824.1 825.3 821.5 820.8 820.5 MAX. QFE PRESSURE IN HPA 824.3 823.8 829.4 826.4 823.9 826.2 824.8 822.8 828.9 829.7 826.4 828.7 829.7 DAY 1 10 9 12 27 6 18 30 30 27 13 4 MIN. QFE PRESSURE IN HPA 808.6 807.5 813.7 811.6 809.8 816.7 816.0 813.7 817.5 815.8 809.5 814.2 807.5 DAY 24 23 31 3 16 10 11 4 6 22 23 16 MEAN QNH PRESSURE IN HPA 1015.1 1016.2 1020.4 1017.1 1016.8 1018.7 1018.9 1018.2 1023.5 1024.9 1020.3 1019.6 1019.1 MAX. QNH PRESSURE IN HPA 1023.7 1023.1 1029.8 1026.2 1023.2 1026.0 1024.3 1021.9 1029.2 1030.2 1026.2 1029.0 1030.2 DAY 1 10 9 12 27 6 18 30 30 27 13 4 MIN. QNH PRESSURE IN HPA 1005.0 1003.7 1011.1 1008.6 1006.4 1014.7 1013.8 1011.1 1015.6 1013.6 1006.1 1011.7 1003.7 DAY 24 23 31 3 16 10 11 4 6 22 23 16 MEAN QFF PRESSURE IN HPA 1017.6 1018.0 1019.1 1014.5 1010.0 1007.9 1007.2 1004.8 1013.9 1019.0 1019.1 1024.6 1014.6 MAX. QFF PRESSURE IN HPA 1030.7 1028.0 1035.4 1027.4 1016.9 1017.7 1013.8 1010.1 1024.1 1028.4 1030.9 1037.7 1037.7 DAY 1 25 9 6 24 13 6 30 21 15 30 3 MIN. QFF PRESSURE IN HPA 1003.5 1002.6 1003.5 1001.3 999.6 1002.9 1001.2 996.0 1001.4 1003.2 1001.6 1015.5 996.0 DAY 24 15 6 23 13 24 10 4 6 22 23 12 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 816.8 817.9 821.8 819.0 818.8 820.6 820.6 820.1 824.5 825.5 821.6 820.9 820.7 MAX. QFE PRESSURE IN HPA 823.3 823.5 829.4 826.8 824.1 825.9 825.2 823.4 828.7 830.3 826.4 829.3 830.3 DAY 1 29 9 12 27 6 18 31 27 27 13 3 MIN. QFE PRESSURE IN HPA 808.8 808.5 813.7 811.4 810.2 816.8 817.0 814.9 819.1 816.2 810.1 813.8 808.5 DAY 23 15 31 3 13 10 11 4 6 22 23 15 MEAN QNH PRESSURE IN HPA 1014.8 1016.1 1020.7 1017.4 1017.2 1019.3 1019.3 1018.8 1023.9 1025.2 1020.5 1019.7 1019.4 MAX. QNH PRESSURE IN HPA 1022.5 1022.8 1029.8 1026.7 1023.5 1025.6 1024.8 1022.6 1029.0 1030.9 1026.2 1029.7 1030.9 DAY 1 29 9 12 27 6 18 31 27 27 13 3 MIN. QNH PRESSURE IN HPA 1005.2 1004.9 1011.1 1008.3 1006.9 1014.8 1015.0 1012.5 1017.5 1014.1 1006.8 1011.2 1004.9 DAY 23 15 31 3 13 10 11 4 6 22 23 15 MEAN QFF PRESSURE IN HPA 1018.3 1019.1 1020.7 1015.9 1011.1 1009.0 1008.6 1006.5 1016.3 1021.6 1020.6 1026.6 1016.2 MAX. QFF PRESSURE IN HPA 1031.3 1028.5 1035.7 1028.9 1017.9 1018.7 1015.1 1012.1 1025.9 1030.3 1034.6 1040.6 1040.6 DAY 1 24 9 6 24 13 6 28 21 27 30 4 MIN. QFF PRESSURE IN HPA 1004.4 1004.6 1004.0 1001.6 997.8 1003.5 1004.5 998.6 1003.4 1006.6 1004.0 1014.3 997.8 DAY 24 15 6 23 13 10 2 12 6 22 23 12 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 817.7 819.0 822.5 819.3 819.1 820.6 820.7 820.5 824.9 826.3 822.4 821.9 821.2 MAX. QFE PRESSURE IN HPA 823.3 825.0 829.9 827.0 824.2 826.3 825.6 823.6 829.3 830.6 827.1 830.5 830.6 DAY 1 29 9 12 27 13 18 17 28 27 12 3 MIN. QFE PRESSURE IN HPA 809.2 808.5 815.0 810.9 809.7 816.9 817.1 815.0 820.0 817.1 808.9 814.6 808.5 DAY 23 15 31 3 13 10 10 3 5 22 23 12 MEAN QNH PRESSURE IN HPA 1015.8 1017.4 1021.5 1017.8 1017.5 1019.3 1019.5 1019.1 1024.5 1026.1 1021.4 1020.9 1020.1 MAX. QNH PRESSURE IN HPA 1022.5 1024.5 1030.4 1026.9 1023.6 1026.1 1025.3 1022.9 1029.7 1031.2 1027.1 1031.1 1031.2 DAY 1 29 9 12 27 13 18 17 28 27 12 3 MIN. QNH PRESSURE IN HPA 1005.7 1004.9 1012.6 1007.7 1006.3 1014.9 1015.1 1012.6 1018.6 1015.1 1005.4 1012.1 1004.9 DAY 23 15 31 3 13 10 10 3 5 22 23 12 MEAN QFF PRESSURE IN HPA 1019.2 1020.0 1020.6 1015.0 1010.2 1008.1 1008.1 1005.6 1014.8 1020.9 1021.0 1027.2 1015.9 MAX. QFF PRESSURE IN HPA 1030.7 1028.3 1035.8 1027.6 1017.4 1019.9 1014.3 1011.2 1021.9 1028.8 1033.8 1041.2 1041.2 DAY 1 25 9 6 22 13 7 7 21 14 30 3 MIN. QFF PRESSURE IN HPA 1007.7 1005.9 1004.1 1001.0 998.9 1001.9 1003.9 997.5 1004.7 1009.5 1002.0 1014.5 997.5 DAY 23 15 6 23 13 20 23 3 10 22 23 12 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 817.3 818.7 821.9 818.9 818.8 820.1 820.2 819.9 824.3 825.5 821.5 821.1 820.7 MAX. QFE PRESSURE IN HPA 822.2 824.3 829.5 826.7 824.3 826.0 825.6 823.0 829.0 829.3 826.8 829.6 829.6 DAY 11 29 8 12 26 13 18 17 27 7 12 3 MIN. QFE PRESSURE IN HPA 808.8 807.2 815.2 810.5 810.2 816.7 816.7 813.7 818.5 818.2 808.1 813.5 807.2 DAY 23 15 31 3 15 17 23 3 5 22 23 15 MEAN QNH PRESSURE IN HPA 1015.3 1017.1 1020.8 1017.2 1017.1 1018.8 1018.8 1018.4 1023.7 1025.2 1020.4 1019.9 1019.4 MAX. QNH PRESSURE IN HPA 1021.2 1023.7 1029.9 1026.6 1023.7 1025.7 1025.3 1022.2 1029.3 1029.7 1026.7 1030.0 1030.0 DAY 11 29 8 12 26 13 18 17 27 7 12 3 MIN. QNH PRESSURE IN HPA 1005.2 1003.3 1012.9 1007.3 1006.9 1014.7 1014.7 1011.1 1016.8 1016.4 1004.4 1010.8 1003.3 DAY 23 15 31 3 15 17 23 3 5 22 23 15 MEAN QFF PRESSURE IN HPA 1017.9 1018.8 1019.4 1014.2 1009.9 1007.5 1006.9 1004.5 1013.7 1018.9 1019.2 1024.6 1014.6 MAX. QFF PRESSURE IN HPA 1027.4 1027.5 1034.4 1026.1 1019.3 1018.5 1013.4 1009.8 1021.5 1027.5 1031.4 1038.1 1038.1 DAY 1 25 8 6 22 13 7 6 19 14 30 3 MIN. QFF PRESSURE IN HPA 1006.1 1004.1 1001.7 1001.4 1000.3 1000.7 1001.4 995.1 1003.6 1010.4 1002.0 1015.3 995.1 DAY 23 15 6 3 11 24 23 3 5 3 23 12 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 816.7 817.8 820.9 818.1 818.1 819.3 819.4 819.0 823.4 824.9 820.8 820.4 819.9 MAX. QFE PRESSURE IN HPA 822.2 823.5 829.2 825.6 823.7 824.8 824.6 821.9 828.2 828.6 825.8 829.1 829.2 DAY 11 29 8 11 26 13 18 17 27 14 12 3 MIN. QFE PRESSURE IN HPA 808.8 806.6 814.9 810.5 807.5 815.8 814.3 812.6 817.1 817.2 808.6 813.0 806.6 DAY 23 15 6 3 15 20 23 3 5 21 23 15 MEAN QNH PRESSURE IN HPA 1014.7 1016.0 1019.7 1016.3 1016.4 1017.7 1017.9 1017.4 1022.6 1024.4 1019.6 1019.1 1018.5 MAX. QNH PRESSURE IN HPA 1021.2 1022.8 1029.6 1025.3 1023.0 1024.3 1024.1 1020.9 1028.4 1028.8 1025.5 1029.4 1029.6 DAY 11 29 8 11 26 13 18 17 27 14 12 3 MIN. QNH PRESSURE IN HPA 1005.2 1002.6 1012.5 1007.3 1003.7 1013.6 1011.8 1009.8 1015.1 1015.2 1005.0 1010.2 1002.6 DAY 23 15 6 3 15 20 23 3 5 21 23 15 MEAN QFF PRESSURE IN HPA 1017.1 1017.7 1018.6 1013.5 1009.5 1006.8 1006.0 1003.8 1013.0 1018.5 1018.4 1024.0 1013.9 MAX. QFF PRESSURE IN HPA 1026.3 1025.9 1035.0 1024.7 1017.0 1016.8 1012.8 1008.2 1020.2 1027.9 1029.9 1037.3 1037.3 DAY 1 25 8 6 22 13 7 30 20 14 29 3 MIN. QFF PRESSURE IN HPA 1005.5 1002.1 1001.4 1000.3 996.6 1000.1 998.5 994.1 1002.8 1009.3 1004.6 1015.0 994.1 DAY 23 15 6 3 15 24 23 3 10 21 23 15 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 817.0 818.0 821.0 818.2 818.2 819.2 819.4 819.0 823.4 825.0 821.3 820.8 820.0 MAX. QFE PRESSURE IN HPA 822.8 824.1 829.8 825.0 823.7 825.4 824.4 822.3 828.3 829.5 826.4 829.4 829.8 DAY 11 29 8 11 26 5 18 29 29 7 12 3 MIN. QFE PRESSURE IN HPA 808.4 807.5 815.4 810.9 808.8 815.3 815.9 812.1 816.5 817.2 810.9 814.2 807.5 DAY 23 15 30 3 15 9 10 3 5 21 23 15 MEAN QNH PRESSURE IN HPA 1015.0 1016.2 1019.7 1016.4 1016.4 1017.7 1017.8 1017.3 1022.6 1024.6 1020.1 1019.6 1018.6 MAX. QNH PRESSURE IN HPA 1021.9 1023.5 1030.3 1024.5 1023.0 1025.0 1023.8 1021.3 1028.5 1029.9 1026.2 1029.8 1030.3 DAY 11 29 8 11 26 5 18 29 29 7 12 3 MIN. QNH PRESSURE IN HPA 1004.8 1003.7 1013.1 1007.7 1005.2 1013.0 1013.7 1009.2 1014.4 1015.2 1007.7 1011.7 1003.7 DAY 23 15 30 3 15 9 10 3 5 21 23 15 MEAN QFF PRESSURE IN HPA 1018.4 1019.0 1019.8 1014.7 1010.2 1007.2 1007.0 1004.9 1014.9 1020.9 1020.4 1026.4 1015.3 MAX. QFF PRESSURE IN HPA 1027.6 1027.0 1036.5 1025.2 1018.3 1016.9 1013.9 1009.3 1022.8 1029.9 1033.0 1039.8 1039.8 DAY 11 24 8 6 22 5 6 28 20 14 29 3 MIN. QFF PRESSURE IN HPA 1004.8 1006.5 1004.2 1002.2 997.7 1000.5 1003.1 995.2 1003.9 1009.4 1008.7 1017.4 995.2 DAY 23 15 6 3 11 24 25 3 5 21 23 9 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 817.3 818.5 821.6 819.1 819.1 820.4 820.7 820.1 824.5 825.8 821.8 821.3 820.8 MAX. QFE PRESSURE IN HPA 822.8 824.9 830.9 826.8 825.1 826.2 824.7 823.4 828.9 830.0 826.4 829.4 830.9 DAY 11 29 8 11 26 5 18 29 29 14 12 3 MIN. QFE PRESSURE IN HPA 808.2 807.5 815.3 811.4 810.0 816.7 816.0 812.9 817.3 817.4 812.7 814.2 807.5 DAY 23 15 30 16 15 9 10 3 5 21 23 15 MEAN QNH PRESSURE IN HPA 1015.4 1016.9 1020.5 1017.5 1017.5 1019.1 1019.4 1018.7 1023.9 1025.5 1020.7 1020.1 1019.6 MAX. QNH PRESSURE IN HPA 1021.9 1024.4 1031.6 1026.7 1024.7 1026.0 1024.2 1022.6 1029.2 1030.5 1026.2 1029.8 1031.6 DAY 11 29 8 11 26 5 18 29 29 14 12 3 MIN. QNH PRESSURE IN HPA 1004.5 1003.7 1013.0 1008.3 1006.7 1014.7 1013.8 1010.1 1015.4 1015.5 1009.9 1011.7 1003.7 DAY 23 15 30 16 15 9 10 3 5 21 23 15 MEAN QFF PRESSURE IN HPA 1018.7 1019.3 1019.7 1014.5 1010.3 1007.8 1007.8 1005.0 1014.3 1020.3 1020.5 1026.4 1015.4 MAX. QFF PRESSURE IN HPA 1028.3 1027.3 1038.1 1027.3 1017.3 1018.2 1013.9 1011.1 1022.1 1029.4 1033.9 1041.2 1041.2 DAY 29 24 8 5 22 13 5 6 19 14 28 3 MIN. QFF PRESSURE IN HPA 1004.2 1006.3 1006.2 1003.5 998.6 1001.9 1003.7 994.1 1001.8 1007.8 1009.2 1016.9 994.1 DAY 23 11 6 23 11 20 25 3 5 21 22 9 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 817.1 818.4 821.6 819.2 819.0 820.3 820.6 820.0 824.4 825.6 821.6 821.2 820.8 MAX. QFE PRESSURE IN HPA 822.8 824.7 831.4 826.8 825.1 826.2 824.4 823.4 828.9 830.0 826.4 829.4 831.4 DAY 11 29 8 11 26 5 17 29 29 26 12 3 MIN. QFE PRESSURE IN HPA 808.2 807.7 814.5 812.6 810.0 816.7 817.3 813.3 817.3 816.4 813.1 814.2 807.7 DAY 23 15 30 2 15 9 12 3 5 21 22 15 MEAN QNH PRESSURE IN HPA 1015.1 1016.7 1020.5 1017.6 1017.5 1018.9 1019.3 1018.6 1023.8 1025.3 1020.5 1020.0 1019.5 MAX. QNH PRESSURE IN HPA 1021.9 1024.2 1032.2 1026.7 1024.7 1026.0 1023.8 1022.6 1029.2 1030.5 1026.2 1029.8 1032.2 DAY 11 29 8 11 26 5 17 29 29 26 12 3 MIN. QNH PRESSURE IN HPA 1004.5 1003.9 1012.0 1009.8 1006.7 1014.7 1015.4 1010.6 1015.4 1014.3 1010.4 1011.7 1003.9 DAY 23 15 30 2 15 9 12 3 5 21 22 15 MEAN QFF PRESSURE IN HPA 1017.6 1018.3 1019.1 1014.4 1010.3 1007.7 1007.4 1004.7 1013.9 1019.0 1019.5 1024.7 1014.7 MAX. QFF PRESSURE IN HPA 1026.8 1027.7 1038.6 1027.2 1018.0 1019.1 1014.0 1011.1 1022.7 1028.6 1031.9 1038.6 1038.6 DAY 29 24 8 5 22 5 5 6 19 14 28 3 MIN. QFF PRESSURE IN HPA 1003.5 1004.0 1003.8 1004.3 998.6 1002.0 1002.7 995.5 1000.9 1006.0 1005.9 1015.8 995.5 DAY 23 22 5 23 12 23 23 3 5 21 22 15 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -3.9 -4.9 3.5 9.4 11.6 16.3 20.5 18.8 15.9 10.1 3.1 0.8 8.4 MINIMUN AIR TEMPERATURE (C) -8.9 -9.6 -1.1 2.6 4.9 9.2 14.8 12.9 8.3 2.7 -2.3 -4.4 2.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 24 21 7 3 0 0 0 0 0 3 9 18 85 DAYS WITH FREEZING MIN.<= 0 30 26 17 10 2 0 0 0 0 6 19 25 135 TEMPERATURE RECORDS LOWEST(C) -17.8 -23.8 -11.0 -5.8 -1.4 3.0 11.4 8.0 3.0 -6.4 -8.0 -15.0 -23.8 DAY 26 13 26 8 23 11 19 19 25 24 24 29 MAXIMUM AIR TEMPERATURE (C) 1.4 0.1 8.2 16.1 18.2 23.0 26.5 25.2 23.4 17.9 9.2 8.0 14.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 2 9 7 1 0 0 0 19 DAYS WITH MAXIMUM TEMP. <= 0 8 11 3 0 0 0 0 0 0 0 0 4 26 TEMPERATURE RECORDS HIGHEST(C) 8.8 7.6 16.6 26.8 23.0 31.0 33.8 32.2 30.0 24.8 20.4 16.0 33.8 DAY 1 19 31 24 26 17 16 6 11 11 1 3 DIF. BETWEEN (MAX.-MIN.) (C) 10.3 9.7 9.3 13.5 13.3 13.8 11.7 12.3 15.1 15.2 11.5 12.4 12.4 MEAN DAILY TEMP. (MDT) (C) -3.7 -4.7 3.6 9.3 11.6 16.1 20.7 19.1 15.8 10.3 3.5 1.8 8.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.0 23.7 10.7 0.0 0.0 0.0 0.0 34.4 HEATING DEG. DAYS(BASE 18 0C) 673.1 636.5 447.2 259.9 199.6 71.8 2.9 17.2 67.8 238.9 435.9 501.5 3552.3 DEWPOINT (MEAN C) -7.6 -8.2 -3.0 0.8 5.2 7.8 10.1 9.9 7.4 2.6 -1.5 -3.9 1.6 MIXING RATIO (G/KG) 2.77 2.71 3.85 5.15 6.92 8.23 9.75 9.66 7.99 5.84 4.24 3.61 5.89 VAPOUR PRESSURE (HPA) 3.62 3.54 5.02 6.74 9.03 10.70 12.65 12.53 10.41 7.66 5.57 4.74 7.68 SATURATION DEF. (HPA) 1.22 1.12 3.29 6.27 5.28 8.98 12.45 10.26 8.89 5.77 2.57 2.33 5.70 RELATIVE HUMIDITY (MEAN %) 79 80 66 60 69 61 54 60 62 65 76 74 67 RELATIVE HUMIDITY (MAX. %) 94 95 87 88 93 85 74 81 88 94 94 94 89 RELATIVE HUMIDITY (MIN. %) 58 59 46 37 44 40 37 40 38 38 51 47 45 RELATIVE HUMIDITY (MEAN% 03UTC) 90 90 81 82 84 78 64 75 85 85 91 87 83 RELATIVE HUMIDITY (MEAN% 09UTC) 62 64 54 40 50 44 42 43 42 42 55 53 49 RELATIVE HUMIDITY (MEAN% 15UTC) 75 76 59 52 64 52 53 59 55 59 72 73 62 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 15.2 71.5 41.5 23.8 136.4 4.0 12.2 6.2 10.3 15.0 60.7 14.1 410.9 DAYS WITH PRECIPITATION >=10 0 2 1 1 8 0 0 0 1 0 2 0 15 DAYS WITH PRECIPITATION >= 5 1 5 2 1 12 0 2 1 1 1 3 1 30 DAYS WITH PRECIPITATION >= 1 5 7 5 6 13 1 2 2 1 5 7 4 58 DAYS WITH PRECIPITATION 13 13 11 7 15 2 4 2 2 5 9 6 89 GREATEST DAILY PRECIPITATION 6.4 34.0 20.0 10.0 21.0 4.0 7.0 5.2 10.0 7.0 26.0 7.2 34.0 DAY 23 21 10 27 30 1 25 12 30 8 5 16 DAY WITH THUNDER STORM 0 0 1 1 14 2 5 2 1 3 2 0 31 DAYS WITH SNOW OR SLEET 13 11 4 3 0 0 0 0 0 1 6 3 41 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 270 90 225 225 90 90 90 90 90 90 90 225 90 PREVAILING WIND SPEED(KNOTS) 7.6 13.4 11.5 10.1 10.0 11.2 12.2 11.7 11.2 10.0 8.3 11.2 11.2 PREVAILING WIND PERCENT 13.3 19.6 37.1 16.7 19.4 34.6 46.4 53.2 30.4 13.7 10.0 12.9 21.5 CALMS PERCENT OF WIND 58.9 50.0 36.7 42.5 42.7 32.5 25.4 29.0 46.3 55.6 60.8 56.0 44.7 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 246 90 225 202 135 99 89 87 92 174 194 233 121 VECTOR WIND MAGNITUDE(KNOTS) 1.2 2.2 4.4 2.1 1.7 3.7 6.7 6.6 3.3 1.7 0.8 1.9 1.7 WIND STEADINESES (MEAN %) 35.3 42.3 65.7 38.2 32.1 53.6 81.7 85.7 60.0 37.8 24.2 47.5 30.9 WIND SPEED (MEAN KNOTS) 3.4 5.2 6.7 5.5 5.3 6.9 8.2 7.7 5.5 4.5 3.3 4.0 5.5 FASTEST WIND DIRECTION 70 80 240 210 220 60 70 80 80 210 80 210 80 FASTEST WIND SPEED (KNOTS) 23 29 29 27 19 19 23 27 19 29 16 25 29 DAY 11 7 20 20 3 9 9 3 6 19 8 16 DAYS WITH SKY CLEAR (0-2)/8 10 9 13 8 10 26 25 28 25 18 13 21 206 DAYS WITH P.CLOUDY (3-6)/8 6 9 7 13 14 4 6 3 5 12 11 8 98 DAYS WITH CLOUDY (7-8)/8 15 10 11 9 7 0 0 0 0 1 6 2 61 DAYS WITH VISIBILITY =< 2 KM 2 5 1 0 1 0 0 0 0 1 2 1 13 DURATION OF SUNSHINE HOURS 120.4 137.1 198.7 234.1 268.5 364.9 355.2 360.6 310.6 249.1 170.8 200.3 2970.3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 818.9 818.1 817.2 821.3 820.8 819.5 820.0 820.6 821.5 824.2 823.4 822.6 820.7 MAX. QFE PRESSURE IN HPA 826.6 826.2 822.3 829.6 825.5 824.8 825.2 824.9 825.7 831.1 828.9 830.4 831.1 DAY-HOUR 9- 6 16- 6 15- 6 5-18 21-18 8-18 28- 6 26-18 9- 6 23- 6 23-15 29- 6 MIN. QFE PRESSURE IN HPA 805.9 809.5 809.3 812.6 810.0 810.5 811.6 815.0 815.9 813.2 817.1 809.6 805.9 DAY-HOUR 23- 3 1-21 24- 3 2-12 3-12 20-15 5-12 8-12 4-15 20-12 6- 0 23-21 MEAN QNH PRESSURE IN HPA 1017.3 1016.3 1015.2 1020.2 1019.5 1018.0 1018.6 1019.3 1020.4 1023.6 1022.6 1021.7 1019.4 MAX. QNH PRESSURE IN HPA 1026.5 1026.0 1021.3 1030.0 1025.1 1024.3 1024.8 1024.4 1025.4 1031.8 1029.2 1031.0 1031.8 DAY-HOUR 9- 6 16- 6 15- 6 5-18 21-18 8-18 28- 6 26-18 9- 6 23- 6 23-15 29- 6 MIN. QNH PRESSURE IN HPA 1001.8 1006.1 1005.8 1009.8 1006.7 1007.3 1008.6 1012.6 1013.7 1010.5 1015.1 1006.2 1001.8 DAY-HOUR 23- 3 1-21 24- 3 2-12 3-12 20-15 5-12 8-12 4-15 20-12 6- 0 23-21 MEAN QFF PRESSURE IN HPA 1023.1 1022.9 1014.8 1015.3 1012.7 1007.7 1005.1 1007.0 1010.4 1018.2 1022.7 1023.6 1015.3 MAX. QFF PRESSURE IN HPA 1037.4 1040.4 1029.3 1035.9 1021.2 1017.3 1012.9 1016.4 1018.7 1033.4 1032.8 1041.1 1041.1 DAY-HOUR 13- 3 15- 3 26- 3 5-18 21-21 8-18 28- 3 29-18 7- 3 23- 6 25- 3 29- 6 MIN. QFF PRESSURE IN HPA 1005.3 1006.4 1003.7 1002.2 998.9 994.6 992.2 997.5 1002.0 1000.7 1010.6 1006.7 992.2 DAY-HOUR 3- 6 1-12 23-21 2-12 3-12 20-15 5-12 6-12 11-21 20-12 5- 9 23-21 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 818.9 817.7 816.9 821.3 820.7 819.6 820.0 820.6 821.6 824.2 823.3 822.6 820.6 MAX. QFE PRESSURE IN HPA 825.6 825.2 821.1 829.1 824.6 823.5 824.0 823.8 825.2 829.6 826.9 829.3 829.6 DAY 9 15 15 6 22 24 28 27 7 12 25 31 MIN. QFE PRESSURE IN HPA 806.1 810.0 809.6 815.8 812.0 813.5 812.7 815.6 817.5 815.4 817.1 810.7 806.1 DAY 23 2 24 16 4 21 6 8 12 20 6 24 MEAN QNH PRESSURE IN HPA 1017.3 1015.9 1014.9 1020.1 1019.4 1018.1 1018.5 1019.4 1020.5 1023.5 1022.5 1021.7 1019.3 MAX. QNH PRESSURE IN HPA 1025.3 1024.8 1019.9 1029.4 1024.1 1022.8 1023.4 1023.1 1024.8 1030.0 1026.8 1029.7 1030.0 DAY 9 15 15 6 22 24 28 27 7 12 25 31 MIN. QNH PRESSURE IN HPA 1002.0 1006.7 1006.2 1013.6 1009.0 1010.8 1009.9 1013.3 1015.6 1013.1 1015.1 1007.5 1002.0 DAY 23 2 24 16 4 21 6 8 12 20 6 24 MEAN QFF PRESSURE IN HPA 1022.6 1022.0 1014.2 1015.1 1012.9 1007.9 1005.1 1006.7 1010.3 1017.8 1022.2 1022.5 1014.9 MAX. QFF PRESSURE IN HPA 1034.7 1039.1 1025.0 1035.0 1020.3 1015.8 1010.8 1014.4 1016.9 1031.3 1030.2 1038.2 1039.1 DAY 13 15 26 6 22 9 28 30 7 23 15 29 MIN. QFF PRESSURE IN HPA 1006.5 1007.0 1006.1 1004.3 1000.9 997.2 994.5 998.9 1003.6 1003.7 1012.9 1007.1 994.5 DAY 23 2 9 27 3 21 6 7 12 20 6 24 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 818.9 817.7 817.2 821.6 820.9 820.2 820.4 821.0 821.9 824.3 823.5 822.6 820.8 MAX. QFE PRESSURE IN HPA 825.2 825.4 821.3 829.0 824.6 823.8 824.8 823.8 825.6 829.8 826.9 829.3 829.8 DAY 9 16 15 6 22 4 28 14 7 12 25 31 MIN. QFE PRESSURE IN HPA 805.9 810.0 809.3 815.7 811.5 814.0 813.3 816.3 817.7 815.2 819.0 810.7 805.9 DAY 23 2 24 27 3 20 6 8 12 20 6 24 MEAN QNH PRESSURE IN HPA 1017.2 1015.9 1015.3 1020.5 1019.6 1018.8 1019.0 1019.7 1020.9 1023.7 1022.7 1021.7 1019.6 MAX. QNH PRESSURE IN HPA 1024.8 1025.0 1020.1 1029.3 1024.1 1023.1 1024.3 1023.1 1025.3 1030.3 1026.8 1029.7 1030.3 DAY 9 16 15 6 22 4 28 14 7 12 25 31 MIN. QNH PRESSURE IN HPA 1001.8 1006.7 1005.8 1013.5 1008.5 1011.4 1010.6 1014.2 1015.8 1012.9 1017.4 1007.5 1001.8 DAY 23 2 24 27 3 20 6 8 12 20 6 24 MEAN QFF PRESSURE IN HPA 1024.1 1023.5 1015.7 1016.8 1013.9 1009.1 1006.4 1008.6 1012.4 1020.0 1024.2 1024.7 1016.6 MAX. QFF PRESSURE IN HPA 1037.4 1040.4 1029.3 1035.2 1019.7 1016.4 1012.9 1015.7 1018.7 1033.1 1032.8 1040.4 1040.4 DAY 13 15 26 6 23 9 28 30 7 24 25 29 MIN. QFF PRESSURE IN HPA 1005.3 1007.9 1006.0 1005.5 999.6 998.9 997.3 1000.9 1005.4 1005.5 1016.3 1007.8 997.3 DAY 3 2 9 27 3 21 6 7 5 20 5 24 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 819.7 818.6 817.9 822.0 821.2 820.1 820.6 821.1 822.3 825.1 824.1 823.5 821.3 MAX. QFE PRESSURE IN HPA 826.6 826.2 822.3 829.3 825.2 824.0 825.2 824.0 825.7 831.1 827.8 830.4 831.1 DAY 9 16 15 6 22 8 28 14 9 23 23 29 MIN. QFE PRESSURE IN HPA 806.1 811.1 810.3 815.6 812.6 812.9 813.7 816.3 817.4 815.2 819.5 812.7 806.1 DAY 23 1 24 27 4 20 6 8 12 20 8 24 MEAN QNH PRESSURE IN HPA 1018.3 1016.9 1016.1 1020.9 1020.0 1018.7 1019.3 1019.9 1021.3 1024.6 1023.5 1022.7 1020.2 MAX. QNH PRESSURE IN HPA 1026.5 1026.0 1021.3 1029.7 1024.8 1023.4 1024.8 1023.4 1025.4 1031.8 1027.9 1031.0 1031.8 DAY 9 16 15 6 22 8 28 14 9 23 23 29 MIN. QNH PRESSURE IN HPA 1002.0 1008.0 1007.0 1013.3 1009.8 1010.1 1011.1 1014.2 1015.5 1012.9 1018.0 1009.9 1002.0 DAY 23 1 24 27 4 20 6 8 12 20 8 24 MEAN QFF PRESSURE IN HPA 1024.6 1023.8 1016.0 1015.9 1012.7 1008.0 1005.7 1007.5 1010.9 1019.2 1023.7 1025.2 1016.1 MAX. QFF PRESSURE IN HPA 1037.4 1039.4 1027.6 1035.0 1018.9 1015.7 1012.0 1015.6 1017.6 1033.4 1031.7 1041.1 1041.1 DAY 13 15 26 6 21 8 28 30 7 23 15 29 MIN. QFF PRESSURE IN HPA 1005.3 1007.6 1005.8 1005.3 1005.5 995.5 995.5 999.0 1003.1 1003.8 1014.3 1009.2 995.5 DAY 3 1 9 26 4 20 5 8 12 20 5 17 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 819.1 818.4 817.5 821.4 820.7 819.5 820.0 820.5 821.6 824.2 823.3 822.6 820.7 MAX. QFE PRESSURE IN HPA 826.0 825.9 821.5 828.5 825.1 823.8 824.4 824.0 825.4 830.4 828.3 829.2 830.4 DAY 9 16 13 6 21 15 28 18 7 23 23 29 MIN. QFE PRESSURE IN HPA 806.8 811.3 811.1 813.8 810.7 812.9 812.6 816.2 817.4 814.2 818.3 812.9 806.8 DAY 23 1 24 2 3 20 6 8 12 20 5 24 MEAN QNH PRESSURE IN HPA 1017.5 1016.6 1015.6 1020.2 1019.4 1018.0 1018.6 1019.2 1020.4 1023.6 1022.6 1021.7 1019.5 MAX. QNH PRESSURE IN HPA 1025.7 1025.6 1020.4 1028.7 1024.7 1023.1 1023.8 1023.4 1025.0 1031.0 1028.5 1029.6 1031.0 DAY 9 16 13 6 21 15 28 18 7 23 23 29 MIN. QNH PRESSURE IN HPA 1002.8 1008.2 1008.0 1011.2 1007.5 1010.1 1009.8 1014.1 1015.5 1011.7 1016.6 1010.1 1002.8 DAY 23 1 24 2 3 20 6 8 12 20 5 24 MEAN QFF PRESSURE IN HPA 1022.4 1022.5 1014.7 1014.7 1012.0 1007.4 1004.6 1006.1 1009.5 1017.3 1021.7 1022.6 1014.6 MAX. QFF PRESSURE IN HPA 1032.7 1035.5 1026.2 1033.1 1019.0 1015.1 1011.2 1014.4 1016.7 1031.5 1028.9 1038.0 1038.0 DAY 13 15 26 6 22 8 8 30 7 23 25 30 MIN. QFF PRESSURE IN HPA 1006.5 1007.4 1005.1 1002.3 1000.0 997.5 994.2 998.1 1002.2 1001.7 1010.6 1009.3 994.2 DAY 3 1 23 2 3 20 6 7 12 20 5 17 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 818.5 817.7 816.6 820.6 820.1 818.7 819.3 819.8 820.6 823.4 822.7 821.8 820.0 MAX. QFE PRESSURE IN HPA 825.2 825.2 820.9 828.2 824.5 823.9 823.6 823.2 824.2 829.5 828.3 828.8 829.5 DAY 9 16 13 5 21 8 28 16 7 23 23 29 MIN. QFE PRESSURE IN HPA 807.7 810.3 811.1 812.6 810.0 811.3 811.6 815.0 816.7 813.2 818.0 811.7 807.7 DAY 23 1 24 2 3 20 5 8 12 20 5 16 MEAN QNH PRESSURE IN HPA 1016.8 1015.9 1014.5 1019.3 1018.7 1017.1 1017.8 1018.3 1019.3 1022.7 1021.8 1020.8 1018.6 MAX. QNH PRESSURE IN HPA 1024.8 1024.8 1019.7 1028.4 1024.0 1023.2 1022.9 1022.4 1023.6 1029.9 1028.5 1029.1 1029.9 DAY 9 16 13 5 21 8 28 16 7 23 23 29 MIN. QNH PRESSURE IN HPA 1003.9 1007.0 1008.0 1009.8 1006.7 1008.2 1008.6 1012.6 1014.7 1010.5 1016.2 1008.7 1003.9 DAY 23 1 24 2 3 20 5 8 12 20 5 16 MEAN QFF PRESSURE IN HPA 1022.0 1021.9 1013.6 1014.2 1012.1 1006.6 1004.0 1005.6 1009.1 1016.8 1021.5 1021.7 1014.1 MAX. QFF PRESSURE IN HPA 1032.5 1034.5 1025.5 1033.1 1018.3 1016.0 1010.9 1013.7 1014.6 1030.0 1028.3 1038.6 1038.6 DAY 12 15 26 5 20 8 8 29 7 23 10 30 MIN. QFF PRESSURE IN HPA 1006.7 1006.4 1005.4 1002.2 998.9 995.6 992.2 997.5 1002.2 1000.7 1013.7 1008.4 992.2 DAY 3 1 23 2 3 20 5 6 11 20 5 16 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M MEANS AND EXTREMES FOR THE YEAR 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 818.7 817.9 816.7 820.6 820.3 818.6 819.2 819.8 820.8 823.7 823.2 822.3 820.1 MAX. QFE PRESSURE IN HPA 825.6 825.6 820.9 828.8 824.5 823.9 823.8 823.6 824.3 829.6 828.9 829.2 829.6 DAY 9 16 13 5 11 8 28 26 8 23 23 30 MIN. QFE PRESSURE IN HPA 808.7 810.3 810.8 815.0 811.0 810.5 811.6 815.4 815.9 814.7 818.5 811.4 808.7 DAY 24 1 23 3 3 20 5 7 4 20 5 23 MEAN QNH PRESSURE IN HPA 1017.1 1016.1 1014.6 1019.4 1018.9 1016.9 1017.6 1018.4 1019.5 1023.0 1022.4 1021.4 1018.8 MAX. QNH PRESSURE IN HPA 1025.3 1025.3 1019.7 1029.1 1024.0 1023.2 1023.1 1022.9 1023.7 1030.0 1029.2 1029.6 1030.0 DAY 9 16 13 5 11 8 28 26 8 23 23 30 MIN. QNH PRESSURE IN HPA 1005.1 1007.0 1007.6 1012.6 1007.9 1007.3 1008.6 1013.1 1013.7 1012.3 1016.8 1008.3 1005.1 DAY 24 1 23 3 3 20 5 7 4 20 5 23 MEAN QFF PRESSURE IN HPA 1023.9 1023.6 1014.9 1015.6 1013.1 1007.0 1004.7 1007.1 1010.9 1019.0 1023.8 1024.5 1015.7 MAX. QFF PRESSURE IN HPA 1036.3 1037.8 1027.2 1034.4 1018.6 1015.8 1011.1 1015.3 1016.2 1031.3 1031.7 1040.7 1040.7 DAY 13 15 26 5 23 8 12 29 7 23 24 30 MIN. QFF PRESSURE IN HPA 1009.1 1007.8 1005.5 1006.5 1000.5 994.6 993.0 998.7 1003.4 1004.4 1014.9 1007.5 993.0 DAY 24 1 23 26 3 20 5 7 11 20 5 16 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 819.0 818.3 817.5 821.6 821.3 819.9 820.4 821.1 821.8 824.5 823.6 822.9 821.0 MAX. QFE PRESSURE IN HPA 825.8 826.0 821.8 829.6 825.5 824.8 824.0 824.9 825.3 829.6 828.7 829.9 829.9 DAY 8 15 17 5 21 8 27 26 7 11 23 30 MIN. QFE PRESSURE IN HPA 809.3 810.1 810.2 816.0 812.8 812.7 812.2 816.8 817.3 817.2 817.9 810.6 809.3 DAY 22 1 23 2 3 20 5 7 4 19 5 23 MEAN QNH PRESSURE IN HPA 1017.5 1016.6 1015.6 1020.5 1020.2 1018.5 1019.1 1019.8 1020.8 1023.9 1022.8 1022.0 1019.8 MAX. QNH PRESSURE IN HPA 1025.5 1025.7 1020.7 1030.0 1025.1 1024.3 1023.4 1024.4 1024.9 1030.0 1029.0 1030.4 1030.4 DAY 8 15 17 5 21 8 27 26 7 11 23 30 MIN. QNH PRESSURE IN HPA 1005.8 1006.8 1006.9 1013.8 1010.0 1009.9 1009.3 1014.8 1015.4 1015.2 1016.1 1007.4 1005.8 DAY 22 1 23 2 3 20 5 7 4 19 5 23 MEAN QFF PRESSURE IN HPA 1023.7 1023.4 1015.3 1015.4 1012.8 1007.7 1005.4 1007.5 1010.4 1018.4 1023.1 1024.7 1015.6 MAX. QFF PRESSURE IN HPA 1036.1 1037.0 1027.6 1035.9 1019.9 1017.3 1011.4 1016.4 1017.4 1031.5 1030.9 1039.3 1039.3 DAY 12 14 26 5 21 8 8 29 6 23 23 29 MIN. QFF PRESSURE IN HPA 1009.4 1007.6 1004.3 1004.3 1006.6 995.1 993.1 999.6 1002.4 1004.6 1012.4 1008.5 993.1 DAY 24 1 23 26 3 20 5 7 4 19 5 16 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 818.8 818.2 817.4 821.6 821.2 819.9 820.3 821.1 821.7 824.4 823.4 822.7 820.9 MAX. QFE PRESSURE IN HPA 825.8 825.2 821.5 829.6 825.5 824.2 824.0 824.4 825.2 829.6 827.6 829.7 829.7 DAY 8 15 13 5 21 8 27 26 6 11 23 30 MIN. QFE PRESSURE IN HPA 807.7 809.5 810.2 815.9 812.4 813.1 812.7 816.8 817.3 816.2 817.9 809.6 807.7 DAY 22 1 23 26 3 20 5 7 4 19 5 23 MEAN QNH PRESSURE IN HPA 1017.1 1016.4 1015.5 1020.5 1020.0 1018.4 1019.0 1019.9 1020.7 1023.9 1022.6 1021.8 1019.6 MAX. QNH PRESSURE IN HPA 1025.5 1024.8 1020.4 1030.0 1025.1 1023.6 1023.4 1023.8 1024.8 1030.0 1027.6 1030.2 1030.2 DAY 8 15 13 5 21 8 27 26 6 11 23 30 MIN. QNH PRESSURE IN HPA 1003.9 1006.1 1006.9 1013.7 1009.5 1010.4 1009.9 1014.8 1015.4 1014.1 1016.1 1006.2 1003.9 DAY 22 1 23 26 3 20 5 7 4 19 5 23 MEAN QFF PRESSURE IN HPA 1021.9 1022.3 1014.5 1015.0 1012.6 1007.8 1005.0 1007.0 1009.7 1017.6 1021.8 1023.0 1014.8 MAX. QFF PRESSURE IN HPA 1033.5 1037.7 1024.2 1035.1 1021.2 1016.7 1010.9 1015.6 1017.3 1030.9 1030.3 1037.7 1037.7 DAY 12 14 17 5 21 8 8 29 6 23 23 28 MIN. QFF PRESSURE IN HPA 1007.0 1006.6 1003.7 1002.9 1004.3 996.9 993.7 998.7 1002.0 1002.6 1011.9 1006.7 993.7 DAY 31 1 23 26 2 20 5 5 11 19 5 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M CLIMATOLOGICAL NORMALS FOR THE PERIOD 1987-2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -3.8 -2.7 2.3 8.7 13.0 17.6 19.9 20.1 16.0 10.1 3.8 -0.7 8.7 MINIMUN AIR TEMPERATURE (C) -9.2 -8.4 -3.6 1.6 4.6 8.7 13.0 12.4 6.8 2.2 -2.2 -5.6 1.7 DAYS WITH MINIMUM TEMP. >=21 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 0.2 DAYS WITH MINIMUM TEMP. <=-4 23.6 20.5 12.7 2.9 0.1 0.0 0.0 0.0 0.0 1.2 10.6 17.1 88.7 DAYS WITH FREEZING MIN.<= 0 29.8 26.6 24.7 11.3 2.2 0.1 0.0 0.0 1.1 10.1 20.7 26.7 153.3 TEMPERATURE RECORDS LOWEST(C) -31.5 -27.6 -24.5 -11.2 -6.5 -0.8 3.0 3.0 -2.0 -7.6 -20.6 -25.0 -31.5 YEAR-DAY 97-29 97- 7 92- 1 4- 6 92- 5 95- 1 96-16 88-26 91-28 93- 8 1-20 94- 7 97-29 MAXIMUM AIR TEMPERATURE (C) 1.0 2.2 7.3 14.3 18.8 23.5 25.2 26.3 23.2 17.0 9.4 4.0 14.3 DAYS WITH MAXIMUM TEMP. >=30 0.0 0.0 0.0 0.0 0.0 1.4 5.2 8.8 1.2 0.0 0.0 0.0 16.6 DAYS WITH MAXIMUM TEMP. <= 0 12.1 8.3 2.6 0.2 0.0 0.0 0.0 0.0 0.0 0.0 1.1 6.0 30.3 TEMPERATURE RECORDS HIGHEST(C) 14.0 14.2 22.4 26.8 29.0 34.8 34.6 35.0 33.6 26.6 20.4 17.0 35.0 YEAR-DAY 0- 1 4-29 4- 6 5-24 99-30 1-23 97-29 91- 4 98- 1 2- 1 5- 1 98-10 91- 4 DIF. BETWEEN (MAX.-MIN.) (C) 10.2 10.6 10.9 12.7 14.2 14.8 12.2 13.9 16.4 14.8 11.6 9.6 12.6 MEAN DAILY TEMP. (MDT) (C) -4.1 -3.1 1.8 7.9 11.7 16.1 19.1 19.4 15.0 9.6 3.6 -0.8 8.0 STANDARD DEVIATION OF MDT(C) 2.80 3.02 2.15 1.27 1.13 1.10 0.88 1.31 1.14 1.67 1.52 2.27 1.69 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.3 13.3 13.7 0.5 0.0 0.0 0.0 28.8 HEATING DEG. DAYS(BASE 18 0C) 684.3 596.2 499.7 300.1 194.4 70.3 20.1 16.3 94.8 260.7 431.1 581.6 3749.6 DEWPOINT (MEAN C) -7.3 -6.8 -3.2 0.7 4.0 6.7 9.4 9.2 5.5 2.2 -1.5 -4.7 1.2 MIXING RATIO (G/KG) 2.89 3.00 3.86 5.11 6.40 7.76 9.33 9.19 7.14 5.60 4.35 3.47 5.67 VAPOUR PRESSURE (HPA) 3.78 3.93 5.05 6.67 8.35 10.10 12.10 11.94 9.33 7.35 5.71 4.55 7.40 SATURATION DEF. (HPA) 1.20 1.52 2.76 5.44 7.65 11.21 12.13 13.01 10.34 6.06 2.92 1.69 6.33 RELATIVE HUMIDITY (MEAN %) 79 76 71 62 60 54 55 55 56 64 72 77 65 RELATIVE HUMIDITY (MAX. %) 92 92 92 89 87 79 75 78 87 91 92 93 87 RELATIVE HUMIDITY (MIN. %) 63 59 52 41 39 36 40 37 34 40 51 59 46 RELATIVE HUMIDITY (MEAN% 03UTC) 88 88 88 84 82 74 69 74 84 88 88 88 83 RELATIVE HUMIDITY (MEAN% 09UTC) 68 65 59 49 45 41 44 41 39 45 56 64 51 RELATIVE HUMIDITY (MEAN% 15UTC) 78 72 65 54 52 48 53 51 50 59 70 76 61 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 29.4 36.3 48.2 60.5 54.8 15.1 11.6 5.5 6.3 31.4 50.6 34.9 384.6 DAYS WITH PRECIPITATION >=10 0.6 0.8 1.2 1.9 1.8 0.4 0.4 0.1 0.2 1.1 1.6 0.9 11.0 DAYS WITH PRECIPITATION >= 5 1.7 2.5 3.4 4.6 4.4 0.9 0.8 0.4 0.5 2.3 3.3 2.2 27.0 DAYS WITH PRECIPITATION >= 1 6.3 6.7 8.6 9.4 8.1 2.9 2.1 0.9 1.5 4.6 6.4 5.8 63.3 DAYS WITH PRECIPITATION 11.4 11.1 12.8 13.1 11.6 4.6 2.9 1.8 2.3 6.5 8.6 9.4 96.1 GREATEST DAILY PRECIPITATION 24.0 34.0 34.0 34.0 28.3 26.0 18.0 36.0 21.0 36.0 37.6 46.0 46.0 YEAR-DAY 88-19 5-21 0-24 96-13 98-29 95- 3 97- 5 87- 6 95-20 0-27 94- 5 91- 9 91 DAY WITH THUNDER STORM 0.1 0.3 0.9 2.6 5.6 2.7 2.2 1.1 0.6 1.4 0.4 0.1 18.0 DAYS WITH SNOW OR SLEET 9.9 9.7 8.4 2.4 0.3 0.0 0.0 0.0 0.0 0.4 3.5 7.8 42.4 DAYS WITH DUST 0.2 0.1 0.1 0.0 0.1 0.1 0.0 0.0 0.0 0.0 0.1 0.1 0.8 WIND DIRECTION (PREVAILING) 270 270 270 270 90 90 90 90 90 90 270 270 90 PREVAILING WIND SPEED(KNOTS) 7.4 7.7 7.6 8.5 8.5 8.9 9.5 9.0 8.8 8.1 7.3 6.9 9.1 PREVAILING WIND PERCENT 10.9 11.7 13.0 18.6 13.4 28.0 45.1 38.8 24.1 12.9 11.5 11.7 17.5 CALMS PERCENT OF WIND 64.1 57.3 54.4 45.3 49.6 41.3 30.4 37.7 52.2 58.4 62.1 62.8 51.3 NO. OF WIND OBSERVATION 203.9 186.0 204.9 205.0 211.8 202.1 208.8 208.4 201.3 208.8 202.1 208.8 2451.9 VECTOR WIND DIRECTION (MEAN) 233 218 222 236 197 106 97 99 106 176 225 236 137 VECTOR WIND MAGNITUDE(KNOTS) 0.6 1.0 1.4 2.3 0.9 2.8 5.5 4.2 1.9 0.8 1.1 0.9 1.0 WIND STEADINESES (MEAN %) 20.7 26.3 35.9 46.0 22.0 57.1 87.3 79.2 50.0 23.5 35.5 30.0 24.4 WIND SPEED (MEAN KNOTS) 2.9 3.8 3.9 5.0 4.1 4.9 6.3 5.3 3.8 3.4 3.1 3.0 4.1 FASTEST WIND DIRECTION 250 270 270 150 210 70 30 80 70 280 90 330 210 FASTEST WIND SPEED (KNOTS) 31 43 39 39 47 31 31 27 23 35 31 33 47 YEAR-DAY 87-10 87-25 87- 6 87- 4 90- 2 90-30 91-18 89- 3 93-23 93-11 94- 6 90- 5 90 DAYS WITH SKY CLEAR (0-2)/8 8.9 8.6 8.8 6.4 11.7 21.9 23.1 23.9 23.4 16.4 11.4 9.0 173.5 DAYS WITH P.CLOUDY (3-6)/8 11.6 9.4 10.4 13.8 13.4 7.1 7.3 6.6 5.9 10.0 11.7 12.1 119.3 DAYS WITH CLOUDY (7-8)/8 10.5 10.2 11.8 9.8 5.9 1.1 0.6 0.5 0.7 4.6 6.9 9.9 72.5 DAYS WITH VISIBILITY =< 2 KM 1.9 1.7 1.5 0.9 0.5 0.1 0.0 0.0 0.1 0.5 1.1 1.4 9.7 DURATION OF SUNSHINE HOURS 131.8 143.0 178.4 209.4 274.5 336.4 354.3 338.6 301.2 227.8 157.0 124.8 2777.2 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M CLIMATOLOGICAL NORMALS FOR THE PERIOD 1987-2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 819.6 818.7 818.2 819.5 820.5 819.7 819.7 820.6 822.2 824.2 822.9 821.2 820.6 MAX. QFE PRESSURE IN HPA 832.3 831.7 831.4 831.1 829.5 829.3 827.9 829.3 831.3 833.4 834.0 833.1 834.0 YEAR-DAY 99- 2 98-22 4- 8 98-12 98- 8 93-22 0-30 96-29 94-23 96- 1 96-16 3-11 96-16 MIN. QFE PRESSURE IN HPA 805.0 802.4 803.6 806.2 807.5 808.4 810.2 812.1 812.2 812.6 808.1 802.0 802.0 YEAR-DAY 0-21 1-21 88- 4 2- 3 4-15 99-24 98- 5 4- 3 96-21 96- 9 4-23 88-27 88-27 MEAN QNH PRESSURE IN HPA 1018.2 1017.0 1016.4 1018.0 1019.2 1018.2 1018.2 1019.3 1021.3 1023.6 1022.1 1020.0 1019.3 MAX. QNH PRESSURE IN HPA 1033.2 1032.5 1032.2 1031.8 1029.9 1029.7 1028.0 1029.7 1032.1 1034.6 1035.3 1034.2 1035.3 YEAR-DAY 99- 2 98-22 4- 8 98-12 98- 8 93-22 0-30 96-29 94-23 96- 1 96-16 3-11 96-16 MIN. QNH PRESSURE IN HPA 1000.7 997.6 999.0 1002.1 1003.7 1004.8 1006.9 1009.2 1009.3 1009.8 1004.4 997.1 997.1 YEAR-DAY 0-21 1-21 88- 4 2- 3 4-15 99-24 98- 5 4- 3 96-21 96- 9 4-23 88-27 88-27 MEAN QFF PRESSURE IN HPA 1023.6 1021.6 1017.5 1013.8 1012.8 1008.0 1005.6 1006.8 1012.6 1018.7 1022.3 1024.2 1015.6 MAX. QFF PRESSURE IN HPA 1047.9 1045.7 1043.8 1035.9 1029.0 1024.7 1017.7 1022.7 1027.1 1034.4 1042.0 1047.0 1047.9 YEAR-DAY 92- 9 97- 7 92-12 5- 5 92- 2 93-22 96-16 92-31 94-24 95-17 96-18 94- 7 92- 9 MIN. QFF PRESSURE IN HPA 1003.5 1001.0 996.7 998.2 996.6 994.2 992.1 994.1 996.4 1000.7 1001.6 998.9 992.1 YEAR-DAY 4-23 3-20 2-27 93-20 4-15 2-19 94-30 4- 3 96- 8 5-20 4-23 94- 3 94-30 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 819.2 817.9 817.8 818.9 820.7 819.7 819.5 820.6 822.6 824.2 822.8 821.0 820.4 MAX. QFE PRESSURE IN HPA 829.3 830.7 829.4 829.8 827.8 827.7 826.2 828.3 831.2 832.3 832.7 831.1 832.7 YEAR-DAY 95- 7 98-23 4- 9 98-12 98- 8 93-22 96- 4 96-29 94-24 96- 2 96-17 3-12 96-17 MIN. QFE PRESSURE IN HPA 806.1 803.4 806.8 806.9 809.8 811.5 812.7 813.7 812.5 814.1 809.5 805.6 803.4 YEAR-DAY 5-23 3-19 97- 7 2- 4 4-16 2-20 5- 6 4- 4 96-22 3-29 4-23 94- 4 3-19 MEAN QNH PRESSURE IN HPA 1017.6 1016.0 1016.0 1017.3 1019.4 1018.2 1018.0 1019.4 1021.7 1023.6 1021.9 1019.8 1019.1 MAX. QNH PRESSURE IN HPA 1029.7 1031.3 1029.8 1030.3 1027.9 1027.8 1026.0 1028.5 1031.9 1033.2 1033.7 1031.8 1033.7 YEAR-DAY 95- 7 98-23 4- 9 98-12 98- 8 93-22 96- 4 96-29 94-24 96- 2 96-17 3-12 96-17 MIN. QNH PRESSURE IN HPA 1002.0 998.8 1002.8 1003.0 1006.4 1008.5 1009.9 1011.1 1009.6 1011.6 1006.1 1001.4 998.8 YEAR-DAY 5-23 3-19 97- 7 2- 4 4-16 2-20 5- 6 4- 4 96-22 3-29 4-23 94- 4 3-19 MEAN QFF PRESSURE IN HPA 1022.8 1020.8 1017.3 1013.5 1013.0 1008.3 1005.5 1006.6 1012.3 1018.1 1021.6 1023.5 1015.3 MAX. QFF PRESSURE IN HPA 1041.6 1040.9 1040.7 1035.0 1027.2 1022.9 1017.7 1019.7 1025.5 1031.8 1037.7 1045.4 1045.4 YEAR-DAY 92-10 94-19 92-12 5- 6 92- 2 93-22 96-16 92-31 94-24 95-25 96-17 3-12 3-12 MIN. QFF PRESSURE IN HPA 1003.5 1001.5 1001.3 998.5 999.6 995.4 993.4 996.0 998.5 1001.5 1001.6 1001.9 993.4 YEAR-DAY 4-24 94- 1 3-26 96-13 4-13 2-20 95-16 4- 4 96- 8 3-27 4-23 2-21 95-16 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 819.5 818.5 818.2 819.6 820.7 820.0 819.9 821.0 822.6 824.3 822.9 821.1 820.7 MAX. QFE PRESSURE IN HPA 831.5 830.3 829.4 830.7 828.4 828.9 827.1 829.1 830.4 832.3 832.7 832.0 832.7 YEAR-DAY 99- 2 98-23 4- 9 98-12 98- 9 93-22 0-30 96-29 94-23 96- 2 96-17 87- 1 96-17 MIN. QFE PRESSURE IN HPA 805.0 803.2 805.0 807.9 810.2 810.0 813.3 814.9 813.9 814.1 808.8 802.0 802.0 YEAR-DAY 0-21 3-19 87-14 2- 4 4-13 99-25 5- 6 97- 5 96-22 3-29 1-18 88-27 88-27 MEAN QNH PRESSURE IN HPA 1018.0 1016.8 1016.4 1018.1 1019.4 1018.6 1018.5 1019.7 1021.7 1023.7 1022.1 1019.9 1019.4 MAX. QNH PRESSURE IN HPA 1032.3 1030.9 1029.8 1031.3 1028.6 1029.2 1027.1 1029.4 1031.0 1033.2 1033.7 1032.9 1033.7 YEAR-DAY 99- 2 98-23 4- 9 98-12 98- 9 93-22 0-30 96-29 94-23 96- 2 96-17 87- 1 96-17 MIN. QNH PRESSURE IN HPA 1000.7 998.5 1000.7 1004.2 1006.9 1006.7 1010.6 1012.5 1011.3 1011.6 1005.2 997.1 997.1 YEAR-DAY 0-21 3-19 87-14 2- 4 4-13 99-25 5- 6 97- 5 96-22 3-29 1-18 88-27 88-27 MEAN QFF PRESSURE IN HPA 1025.1 1022.9 1018.4 1015.2 1013.3 1008.8 1006.9 1008.3 1013.9 1020.4 1023.2 1024.3 1016.7 MAX. QFF PRESSURE IN HPA 1048.3 1047.8 1043.8 1035.2 1028.4 1024.7 1016.2 1022.7 1028.6 1033.5 1045.4 1047.0 1048.3 YEAR-DAY 90-27 88- 7 92-12 5- 6 92- 2 93-22 92-12 92-31 89-23 90-16 87-30 94- 7 90-27 MIN. QFF PRESSURE IN HPA 1002.0 998.8 999.7 1001.6 997.8 993.4 994.9 998.6 998.7 1002.2 1004.0 997.8 993.4 YEAR-DAY 0-21 1-21 88- 3 93-20 4-13 99-25 95-16 97- 5 96- 8 3-29 4-23 88-27 99-25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M CLIMATOLOGICAL NORMALS FOR THE PERIOD 1987-2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 820.3 819.4 818.9 820.1 821.0 820.1 820.1 821.2 823.0 825.0 823.7 821.9 821.2 MAX. QFE PRESSURE IN HPA 832.3 830.9 829.9 831.1 829.5 829.2 827.9 829.3 831.3 832.8 833.8 832.0 833.8 YEAR-DAY 99- 2 98-23 4- 9 98-12 98- 8 93-22 0-30 96-29 94-23 95-25 97- 8 87- 1 97- 8 MIN. QFE PRESSURE IN HPA 806.0 802.4 806.2 808.0 809.7 810.2 813.2 814.9 815.2 815.1 808.9 803.0 802.4 YEAR-DAY 0-21 1-21 3-26 2- 3 4-13 99-25 95- 2 94- 1 96-21 3-27 4-23 88-27 1-21 MEAN QNH PRESSURE IN HPA 1019.0 1017.8 1017.3 1018.7 1019.7 1018.7 1018.7 1020.0 1022.2 1024.5 1023.0 1020.8 1020.0 MAX. QNH PRESSURE IN HPA 1033.2 1031.6 1030.4 1031.8 1029.9 1029.6 1028.0 1029.7 1032.1 1033.8 1035.0 1032.9 1035.0 YEAR-DAY 99- 2 98-23 4- 9 98-12 98- 8 93-22 0-30 96-29 94-23 95-25 97- 8 87- 1 97- 8 MIN. QNH PRESSURE IN HPA 1001.9 997.6 1002.1 1004.3 1006.3 1006.9 1010.5 1012.5 1012.9 1012.7 1005.4 998.3 997.6 YEAR-DAY 0-21 1-21 3-26 2- 3 4-13 99-25 95- 2 94- 1 96-21 3-27 4-23 88-27 1-21 MEAN QFF PRESSURE IN HPA 1025.2 1022.9 1018.9 1014.3 1012.9 1008.2 1006.2 1007.5 1013.2 1019.7 1023.7 1025.6 1016.5 MAX. QFF PRESSURE IN HPA 1046.9 1045.7 1043.3 1035.0 1029.0 1024.0 1017.3 1020.1 1025.4 1033.4 1042.0 1046.2 1046.9 YEAR-DAY 92- 9 97- 7 92-12 5- 6 92- 2 93-22 92-12 96-29 94-23 5-23 96-18 3-12 92- 9 MIN. QFF PRESSURE IN HPA 1005.3 1001.4 999.4 1000.7 998.9 995.5 995.5 995.9 999.4 1002.4 1002.0 1002.8 995.5 YEAR-DAY 5- 3 3-20 3-26 93-20 4-13 5-20 5- 5 97- 5 96- 8 3-27 4-23 2-21 5-20 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 819.8 819.0 818.6 819.7 820.7 819.8 819.8 820.7 822.3 824.3 822.9 821.2 820.7 MAX. QFE PRESSURE IN HPA 830.8 831.0 829.5 830.4 828.9 829.3 827.6 829.3 830.6 832.4 832.8 831.8 832.8 YEAR-DAY 99- 2 98-22 4- 8 98-12 3- 1 93-22 0-30 96-29 94-23 98- 9 96-16 3-11 96-16 MIN. QFE PRESSURE IN HPA 805.2 803.4 804.2 806.9 810.2 809.6 812.4 813.6 814.0 814.2 808.1 803.0 803.0 YEAR-DAY 0-21 1-21 3-26 2- 3 4-15 99-25 98- 5 94- 1 96-21 5-20 4-23 88-27 88-27 MEAN QNH PRESSURE IN HPA 1018.4 1017.4 1016.9 1018.3 1019.4 1018.4 1018.3 1019.4 1021.4 1023.7 1022.1 1020.0 1019.5 MAX. QNH PRESSURE IN HPA 1031.5 1031.7 1029.9 1031.0 1029.2 1029.7 1027.6 1029.7 1031.2 1033.4 1033.8 1032.7 1033.8 YEAR-DAY 99- 2 98-22 4- 8 98-12 3- 1 93-22 0-30 96-29 94-23 98- 9 96-16 3-11 96-16 MIN. QNH PRESSURE IN HPA 1000.9 998.8 999.7 1003.0 1006.9 1006.2 1009.5 1011.0 1011.4 1011.7 1004.4 998.3 998.3 YEAR-DAY 0-21 1-21 3-26 2- 3 4-15 99-25 98- 5 94- 1 96-21 5-20 4-23 88-27 88-27 MEAN QFF PRESSURE IN HPA 1023.0 1021.3 1017.7 1013.6 1012.4 1007.8 1005.2 1006.2 1011.9 1017.8 1021.5 1023.3 1015.1 MAX. QFF PRESSURE IN HPA 1041.1 1042.9 1041.4 1033.1 1029.0 1023.7 1016.4 1020.9 1024.3 1032.3 1037.6 1042.2 1042.9 YEAR-DAY 92- 9 97- 7 92-12 5- 6 92- 2 93-22 92-12 96-29 97-14 95-17 96-18 94- 7 97- 7 MIN. QFF PRESSURE IN HPA 1004.6 1001.1 997.3 998.2 1000.0 996.8 994.2 995.1 998.0 1001.7 1002.0 1000.5 994.2 YEAR-DAY 93- 8 3-19 3-26 93-20 5- 3 95-29 5- 6 4- 3 96- 8 3-27 4-23 2-21 5- 6 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 819.1 818.2 817.7 818.9 820.0 819.1 819.1 819.8 821.5 823.5 822.3 820.6 820.0 MAX. QFE PRESSURE IN HPA 829.3 830.6 829.4 829.1 828.1 828.6 827.4 828.5 829.0 832.1 832.8 831.9 832.8 YEAR-DAY 99- 2 98-22 90- 9 88- 8 3- 1 93-22 0-30 87- 8 89-22 98- 9 87-30 3-11 87-30 MIN. QFE PRESSURE IN HPA 805.2 803.6 804.2 806.5 807.5 809.3 811.3 812.6 812.7 813.2 808.6 804.2 803.6 YEAR-DAY 0-19 99-20 88- 4 2- 3 4-15 99-25 98- 5 4- 3 96-21 5-20 4-23 88-26 99-20 MEAN QNH PRESSURE IN HPA 1017.5 1016.4 1015.8 1017.3 1018.6 1017.5 1017.5 1018.4 1020.4 1022.8 1021.3 1019.3 1018.6 MAX. QNH PRESSURE IN HPA 1029.7 1031.2 1029.8 1029.4 1028.2 1028.8 1027.4 1028.7 1029.3 1033.0 1033.8 1032.8 1033.8 YEAR-DAY 99- 2 98-22 90- 9 88- 8 3- 1 93-22 0-30 87- 8 89-22 98- 9 87-30 3-11 87-30 MIN. QNH PRESSURE IN HPA 1000.9 999.0 999.7 1002.5 1003.7 1005.8 1008.2 1009.8 1009.9 1010.5 1005.0 999.7 999.0 YEAR-DAY 0-19 99-20 88- 4 2- 3 4-15 99-25 98- 5 4- 3 96-21 5-20 4-23 88-26 99-20 MEAN QFF PRESSURE IN HPA 1022.2 1020.4 1016.7 1012.8 1012.3 1007.3 1004.5 1005.5 1011.3 1017.2 1020.8 1022.7 1014.5 MAX. QFF PRESSURE IN HPA 1040.7 1041.7 1039.8 1033.1 1028.1 1022.3 1015.0 1019.2 1023.9 1032.2 1036.5 1041.3 1041.7 YEAR-DAY 92- 9 97- 7 92-12 5- 5 92- 2 93-22 92-12 96-29 97-14 95-17 96-16 94- 7 97- 7 MIN. QFF PRESSURE IN HPA 1004.8 1001.0 1000.0 1000.0 996.6 995.4 992.1 994.1 996.4 1000.7 1003.5 1000.0 992.1 YEAR-DAY 3-28 3-20 3-19 3-26 4-15 95-29 94-30 4- 3 96- 8 5-20 93-10 94- 3 94-30 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M CLIMATOLOGICAL NORMALS FOR THE PERIOD 1987-2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 819.5 818.4 817.8 819.0 820.0 819.0 819.0 819.8 821.6 823.7 822.7 821.1 820.1 MAX. QFE PRESSURE IN HPA 829.4 830.9 830.2 829.2 827.5 827.9 827.4 828.8 829.0 832.1 832.9 832.3 832.9 YEAR-DAY 95- 6 98-22 90-16 98-11 3- 1 93-22 0-30 93-28 89-22 98- 9 96-16 3-11 96-16 MIN. QFE PRESSURE IN HPA 805.7 804.2 803.6 806.5 808.8 808.4 810.2 812.1 812.2 812.6 810.2 805.2 803.6 YEAR-DAY 3-28 99-20 88- 4 2- 3 4-15 99-24 98- 5 4- 3 96-21 96- 9 1-17 94- 3 88- 4 MEAN QNH PRESSURE IN HPA 1017.9 1016.7 1016.0 1017.3 1018.6 1017.3 1017.4 1018.4 1020.5 1023.1 1021.8 1019.8 1018.7 MAX. QNH PRESSURE IN HPA 1029.8 1031.6 1030.7 1029.6 1027.5 1028.0 1027.4 1029.1 1029.3 1033.0 1034.0 1033.2 1034.0 YEAR-DAY 95- 6 98-22 90-16 98-11 3- 1 93-22 0-30 93-28 89-22 98- 9 96-16 3-11 96-16 MIN. QNH PRESSURE IN HPA 1001.5 999.7 999.0 1002.5 1005.2 1004.8 1006.9 1009.2 1009.3 1009.8 1006.9 1000.9 999.0 YEAR-DAY 3-28 99-20 88- 4 2- 3 4-15 99-24 98- 5 4- 3 96-21 96- 9 1-17 94- 3 88- 4 MEAN QFF PRESSURE IN HPA 1025.0 1022.8 1017.8 1014.3 1012.2 1007.4 1005.6 1006.8 1012.7 1019.7 1022.9 1024.3 1016.0 MAX. QFF PRESSURE IN HPA 1050.2 1048.9 1043.4 1034.4 1028.3 1020.8 1016.9 1020.4 1027.2 1033.7 1045.0 1045.8 1050.2 YEAR-DAY 90-26 88- 6 90-16 5- 5 92- 2 93-22 92-12 96-29 89-22 95-17 87-30 94- 7 90-26 MIN. QFF PRESSURE IN HPA 1004.8 999.2 1000.3 999.8 997.5 991.2 992.1 995.2 997.7 1004.1 1003.7 998.9 991.2 YEAR-DAY 4-23 99-20 88- 4 2- 3 91-16 99-24 98- 5 4- 3 96- 8 3-28 1-17 94- 3 99-24 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 819.4 818.3 818.3 819.3 821.2 820.0 819.9 821.0 822.9 824.5 823.0 821.3 820.8 MAX. QFE PRESSURE IN HPA 829.6 831.5 830.9 829.8 828.5 828.3 827.0 828.7 830.4 833.4 834.0 833.1 834.0 YEAR-DAY 95- 6 98-22 4- 8 98-11 3- 1 98-16 98-19 96-28 94-23 96- 1 96-16 3-11 96-16 MIN. QFE PRESSURE IN HPA 806.2 805.6 808.1 806.2 810.0 811.5 812.2 812.9 813.8 814.4 812.2 806.0 805.6 YEAR-DAY 92-30 3-19 3-26 2- 3 4-15 2-19 98- 5 4- 3 96-21 3-28 94-25 94- 3 3-19 MEAN QNH PRESSURE IN HPA 1017.9 1016.6 1016.5 1017.8 1020.0 1018.6 1018.5 1019.8 1022.1 1024.0 1022.2 1020.1 1019.5 MAX. QNH PRESSURE IN HPA 1030.0 1032.3 1031.6 1030.3 1028.7 1028.5 1026.9 1029.0 1031.0 1034.6 1035.3 1034.2 1035.3 YEAR-DAY 95- 6 98-22 4- 8 98-11 3- 1 98-16 98-19 96-28 94-23 96- 1 96-16 3-11 96-16 MIN. QNH PRESSURE IN HPA 1002.1 1001.4 1004.4 1002.1 1006.7 1008.5 1009.3 1010.1 1011.2 1011.9 1009.3 1001.9 1001.4 YEAR-DAY 92-30 3-19 3-26 2- 3 4-15 2-19 98- 5 4- 3 96-21 3-28 94-25 94- 3 3-19 MEAN QFF PRESSURE IN HPA 1024.5 1022.4 1018.2 1013.9 1012.7 1008.0 1006.0 1007.2 1012.8 1019.0 1023.0 1025.0 1016.1 MAX. QFF PRESSURE IN HPA 1047.9 1044.1 1041.4 1035.9 1028.9 1022.4 1017.3 1021.0 1025.7 1034.4 1040.3 1046.5 1047.9 YEAR-DAY 92- 9 97- 7 92-12 5- 5 92- 2 93-21 92-11 92-30 97-14 95-17 96-18 3-11 92- 9 MIN. QFF PRESSURE IN HPA 1004.2 1002.4 1002.2 1000.1 998.6 994.5 993.1 994.1 999.5 1003.6 1004.9 1002.5 993.1 YEAR-DAY 4-23 3-19 98-29 2- 3 4-11 2-19 5- 5 4- 3 96- 8 3-28 92-22 94- 3 5- 5 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 819.3 818.3 818.2 819.3 821.1 820.0 819.9 821.0 822.9 824.4 822.9 821.1 820.7 MAX. QFE PRESSURE IN HPA 829.6 831.7 831.4 829.8 828.4 828.3 827.2 828.3 831.2 832.3 833.8 832.1 833.8 YEAR-DAY 95- 6 98-22 4- 8 98-11 98- 8 98-16 96- 3 96-28 94-23 96- 1 96-16 3-11 96-16 MIN. QFE PRESSURE IN HPA 806.8 804.2 808.3 806.2 810.0 811.5 812.7 813.3 813.1 814.1 810.0 805.9 804.2 YEAR-DAY 92-30 3-18 92-30 2- 3 4-15 2-19 5- 5 4- 3 96-21 3-28 92-24 94- 3 3-18 MEAN QNH PRESSURE IN HPA 1017.7 1016.5 1016.4 1017.8 1019.9 1018.6 1018.5 1019.8 1022.0 1023.9 1022.1 1019.9 1019.4 MAX. QNH PRESSURE IN HPA 1030.0 1032.5 1032.2 1030.3 1028.6 1028.5 1027.2 1028.5 1031.9 1033.2 1035.0 1033.0 1035.0 YEAR-DAY 95- 6 98-22 4- 8 98-11 98- 8 98-16 96- 3 96-28 94-23 96- 1 96-16 3-11 96-16 MIN. QNH PRESSURE IN HPA 1002.8 999.7 1004.6 1002.1 1006.7 1008.5 1009.9 1010.6 1010.4 1011.6 1006.7 1001.8 999.7 YEAR-DAY 92-30 3-18 92-30 2- 3 4-15 2-19 5- 5 4- 3 96-21 3-28 92-24 94- 3 3-18 MEAN QFF PRESSURE IN HPA 1022.8 1021.2 1017.4 1013.6 1012.6 1008.1 1005.6 1006.8 1012.2 1018.0 1021.7 1023.6 1015.3 MAX. QFF PRESSURE IN HPA 1041.0 1041.1 1039.4 1035.1 1027.6 1023.6 1016.7 1021.1 1025.4 1031.7 1038.5 1046.0 1046.0 YEAR-DAY 92- 9 94-18 92-11 5- 5 92- 1 93-21 92-11 92-30 97-14 95-17 96-17 3-11 3-11 MIN. QFF PRESSURE IN HPA 1003.5 1002.6 1002.1 1000.1 998.6 994.2 993.7 994.8 999.6 1001.5 1002.0 1001.5 993.7 YEAR-DAY 4-23 98- 7 98-29 2- 3 4-12 2-19 5- 5 2-15 96- 7 3-28 92-22 94- 3 5- 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) FORM 1 LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M AVERAGE OF DRY BULB TEMPERATURE IN C. YEAR JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL 1987 0.1 2.0 2.6 9.2 17.5 20.6 21.3 20.6 16.4 6.5 5.4 0.5 10.2 1988 -4.3 -5.2 2.7 9.1 14.3 19.1 19.8 18.7 16.6 11.7 5.0 0.2 9.0 1989 -9.1 -7.8 2.9 11.0 14.7 20.1 22.5 21.9 17.0 12.6 6.0 0.5 9.4 1990 -6.7 -3.7 1.7 7.4 14.1 20.0 21.2 19.8 18.7 10.5 7.2 0.3 9.2 1991 -3.3 -3.2 2.9 10.1 13.0 18.1 21.5 21.4 14.4 9.6 3.4 -3.5 8.7 1992 -8.5 -4.9 -3.5 5.6 8.8 15.2 18.9 16.0 12.8 8.3 3.5 -1.9 5.9 1993 -6.7 -4.2 -0.4 7.8 11.3 15.5 18.3 18.2 14.9 7.1 -1.0 -2.2 6.6 1994 -1.8 -4.0 2.8 9.4 11.6 14.6 17.6 18.1 12.9 8.6 4.1 -4.0 7.5 1995 -0.8 -0.7 3.2 8.1 12.0 15.1 18.7 20.4 14.9 7.3 3.3 -3.4 8.2 1996 -5.1 -1.5 0.6 6.5 13.3 15.4 20.0 19.8 16.2 8.8 1.8 2.3 8.2 1997 -4.0 -7.0 -1.3 7.5 12.2 17.5 19.3 21.0 13.3 10.8 2.1 -1.3 7.5 1998 -6.4 -5.4 1.7 8.7 12.5 18.4 18.9 20.1 18.0 11.6 8.1 3.8 9.2 1999 -1.8 1.7 4.1 9.4 15.7 20.2 19.9 23.8 17.3 12.9 2.9 1.5 10.6 2000 -2.9 -2.2 2.6 12.2 16.0 18.9 22.6 21.9 17.5 9.3 2.9 0.5 10.0 2001 -2.3 0.5 7.1 12.3 14.7 19.3 19.8 22.1 18.5 11.2 4.5 2.3 10.8 2002 -2.0 0.6 5.5 7.1 11.2 16.6 19.6 19.1 17.3 12.3 3.5 -5.0 8.8 2003 -2.3 -1.7 0.7 8.2 11.6 15.5 19.4 20.0 15.5 12.5 2.8 -1.9 8.4 2004 -0.7 0.4 4.4 6.4 11.6 17.2 17.8 20.3 15.1 10.0 3.7 -3.7 8.5 2005 -3.9 -4.9 3.5 9.4 11.6 16.3 20.5 18.8 15.9 10.1 3.1 0.8 8.4 MEAN -3.8 -2.7 2.3 8.7 13.0 17.6 19.9 20.1 16.0 10.1 3.8 -0.7 8.7 =============================================================================================== TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) FORM 2 LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M AVERAGE OF MINIMUM TEMPERATURE IN C. YEAR JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL 1987 -5.9 -4.0 -3.0 -0.9 4.9 10.6 10.5 10.0 6.0 0.5 -3.3 -3.8 1.8 1988 -9.6 -11.7 -2.3 2.0 4.3 8.6 12.7 11.8 6.6 2.0 -2.6 -6.0 1.3 1989 -17.0 -18.2 -3.5 0.6 3.7 8.6 14.4 13.1 5.0 3.9 0.9 -5.1 0.5 1990 -14.3 -9.2 -4.8 -0.2 4.2 8.0 13.1 12.2 6.5 1.9 -1.5 -6.3 0.8 1991 -9.8 -9.7 -2.5 1.7 3.5 9.0 14.0 12.0 5.4 3.0 -2.3 -7.6 1.4 1992 -14.4 -10.1 -9.8 0.4 3.4 7.3 12.1 9.9 4.6 -0.2 -1.8 -5.3 -0.3 1993 -12.1 -9.0 -5.5 2.0 4.9 7.1 11.8 11.3 6.4 -0.4 -4.5 -7.1 0.4 1994 -6.4 -8.2 -1.9 2.3 3.8 7.9 12.0 12.5 5.0 1.8 -0.1 -8.6 1.7 1995 -4.5 -5.3 -3.8 1.9 4.7 7.1 12.9 12.2 6.4 0.3 -4.6 -8.8 1.5 1996 -10.0 -5.7 -3.3 1.3 6.4 8.2 13.8 11.4 7.7 2.7 -4.2 -1.8 2.2 1997 -9.6 -14.1 -6.8 0.6 4.5 9.4 13.6 13.2 5.6 3.1 -2.7 -5.4 1.0 1998 -11.4 -10.6 -3.1 1.9 5.5 10.9 12.9 12.9 8.7 1.1 -0.0 -3.3 2.1 1999 -7.5 -4.5 -3.4 1.5 4.1 10.5 12.7 14.5 7.4 3.2 -3.4 -4.4 2.6 2000 -8.2 -9.1 -4.0 3.7 6.3 8.9 12.9 13.1 8.6 2.3 -3.1 -3.7 2.3 2001 -8.0 -5.4 -2.1 3.3 4.3 8.1 12.9 12.5 8.3 3.4 -1.8 -1.4 2.9 2002 -7.1 -6.0 -1.9 3.0 4.8 8.0 13.6 12.2 6.6 4.0 -1.7 -10.0 2.1 2003 -6.7 -5.2 -3.6 2.9 4.2 8.5 13.7 14.1 9.2 4.5 -2.4 -5.6 2.8 2004 -3.8 -3.9 -2.1 -0.1 5.9 10.2 12.2 14.0 7.2 2.5 -0.5 -8.5 2.8 2005 -8.9 -9.6 -1.1 2.6 4.9 9.2 14.8 12.9 8.3 2.7 -2.3 -4.4 2.4 MEAN -9.2 -8.4 -3.6 1.6 4.6 8.7 13.0 12.4 6.8 2.2 -2.2 -5.6 1.7 =============================================================================================== TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) FORM 3 LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M AVERAGE OF MAXIMUM TEMPERATURE IN C. YEAR JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL 1987 4.3 6.2 6.3 14.2 22.4 25.0 25.9 25.8 22.6 10.8 10.6 3.7 14.8 1988 -0.3 -0.8 6.8 13.4 19.1 23.4 23.6 22.9 22.2 17.4 10.0 4.3 13.5 1989 -3.9 -1.2 6.7 16.2 20.0 25.1 26.8 26.9 23.3 17.5 9.7 4.6 14.3 1990 -1.7 0.0 6.2 12.3 18.8 25.1 25.8 24.6 25.3 16.0 13.0 5.1 14.2 1991 0.9 0.7 6.0 15.0 17.8 22.1 25.8 27.0 23.1 16.8 10.1 1.1 13.9 1992 -2.3 -0.3 1.8 11.4 13.8 22.1 26.1 22.9 20.9 17.5 10.2 1.8 12.2 1993 -1.4 0.5 5.1 13.7 17.3 22.8 25.0 25.4 24.3 15.7 3.3 2.9 12.9 1994 2.8 1.0 8.2 16.3 18.4 21.1 23.8 24.4 20.8 15.9 9.0 1.3 13.6 1995 3.7 5.1 10.3 14.1 18.4 21.9 25.0 29.0 23.5 15.1 11.4 2.6 15.0 1996 0.4 3.9 5.1 12.2 19.8 22.3 26.1 27.7 24.6 15.8 9.6 7.5 14.6 1997 2.4 0.4 4.4 14.4 18.9 24.8 25.6 28.8 21.7 19.0 8.7 3.7 14.4 1998 -0.9 -0.1 6.8 15.5 19.3 25.2 24.7 27.3 23.4 17.7 13.0 8.9 15.1 1999 2.8 6.2 8.6 14.1 21.3 24.9 23.6 28.9 23.1 18.6 7.2 6.2 15.4 2000 1.2 2.3 7.2 16.9 20.7 23.8 27.2 26.7 23.1 14.4 7.4 4.0 14.6 2001 2.2 4.6 12.4 17.2 20.3 24.2 23.6 27.5 24.1 16.2 8.9 5.5 15.6 2002 1.6 5.4 10.9 12.0 17.3 24.1 25.3 26.3 27.1 21.1 9.9 -0.3 15.1 2003 2.1 2.2 5.6 13.6 18.4 21.9 25.0 26.2 22.1 20.7 9.1 2.8 14.2 2004 3.1 5.2 11.1 12.9 17.4 23.8 23.9 26.6 22.7 18.5 8.6 2.0 14.7 2005 1.4 0.1 8.2 16.1 18.2 23.0 26.5 25.2 23.4 17.9 9.2 8.0 14.8 MEAN 1.0 2.2 7.3 14.3 18.8 23.5 25.2 26.3 23.2 17.0 9.4 4.0 14.3 =============================================================================================== TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) FORM 4 LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M DIFFERENCE BETWEEN AVERAGE MAXIMUM AND MINIMUM TEMPERATURE IN C. YEAR JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL 1987 10.2 10.2 9.3 15.1 17.5 14.4 15.4 15.8 16.6 10.3 13.9 7.5 13.0 1988 9.3 10.9 9.1 11.4 14.8 14.8 10.9 11.1 15.6 15.4 12.6 10.3 12.2 1989 13.1 17.0 10.2 15.6 16.3 16.5 12.4 13.8 18.3 13.6 8.8 9.7 13.8 1990 12.6 9.2 11.0 12.5 14.6 17.1 12.7 12.4 18.8 14.1 14.5 11.4 13.4 1991 10.7 10.4 8.5 13.3 14.3 13.1 11.8 15.0 17.7 13.8 12.4 8.7 12.5 1992 12.1 9.8 11.6 11.0 10.4 14.8 14.0 13.0 16.3 17.7 12.0 7.1 12.5 1993 10.7 9.5 10.6 11.7 12.4 15.7 13.2 14.1 17.9 16.1 7.8 10.0 12.5 1994 9.2 9.2 10.1 14.0 14.6 13.2 11.8 11.9 15.8 14.1 9.1 9.9 11.9 1995 8.2 10.4 14.1 12.2 13.7 14.8 12.1 16.8 17.1 14.8 16.0 11.4 13.5 1996 10.4 9.6 8.4 10.9 13.4 14.1 12.3 16.3 16.9 13.1 13.8 9.3 12.4 1997 12.0 14.5 11.2 13.8 14.4 15.4 12.0 15.6 16.1 15.9 11.4 9.1 13.4 1998 10.5 10.5 9.9 13.6 13.8 14.3 11.8 14.4 14.7 16.6 13.0 12.2 13.0 1999 10.3 10.7 12.0 12.6 17.2 14.4 10.9 14.4 15.7 15.4 10.6 10.6 12.8 2000 9.4 11.4 11.2 13.2 14.4 14.9 14.3 13.6 14.5 12.1 10.5 7.7 12.3 2001 10.2 10.0 14.5 13.9 16.0 16.1 10.7 15.0 15.8 12.8 10.7 6.9 12.7 2002 8.7 11.4 12.8 9.0 12.5 16.1 11.7 14.1 20.5 17.1 11.6 9.7 13.0 2003 8.8 7.4 9.2 10.7 14.2 13.4 11.3 12.1 12.9 16.2 11.5 8.4 11.4 2004 6.9 9.1 13.2 13.0 11.5 13.6 11.7 12.6 15.5 16.0 9.1 10.5 11.9 2005 10.3 9.7 9.3 13.5 13.3 13.8 11.7 12.3 15.1 15.2 11.5 12.4 12.4 MEAN 10.2 10.6 10.9 12.7 14.2 14.8 12.2 13.9 16.4 14.8 11.6 9.6 12.6 =============================================================================================== TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) FORM 5 LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M AVERAGE OF MEAN DAILY TEMPERATURE IN C. YEAR JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL 1987 -0.8 1.1 1.6 6.7 13.6 17.8 18.2 17.9 14.3 5.7 3.6 -0.1 8.3 1988 -5.0 -6.2 2.2 7.7 11.7 16.0 18.1 17.3 14.4 9.7 3.7 -0.9 7.4 1989 -10.5 -9.7 1.6 8.4 11.8 16.8 20.6 20.0 14.2 10.7 5.3 -0.2 7.4 1990 -8.0 -4.6 0.7 6.0 11.5 16.5 19.5 18.4 15.9 8.9 5.7 -0.6 7.5 1991 -4.4 -4.5 1.7 8.4 10.6 15.5 19.9 19.5 14.3 9.9 3.9 -3.2 7.6 1992 -8.4 -5.2 -4.0 5.9 8.6 14.7 19.1 16.4 12.7 8.6 4.2 -1.7 5.9 1993 -6.7 -4.2 -0.2 7.9 11.1 15.0 18.4 18.4 15.3 7.7 -0.6 -2.1 6.6 1994 -1.8 -3.6 3.1 9.3 11.1 14.5 17.9 18.5 12.9 8.9 4.4 -3.6 7.6 1995 -0.4 -0.1 3.2 8.0 11.5 14.5 19.0 20.6 15.0 7.7 3.4 -3.1 8.3 1996 -4.8 -0.9 0.9 6.7 13.1 15.2 20.0 19.5 16.1 9.2 2.7 2.8 8.4 1997 -3.6 -6.8 -1.2 7.5 11.7 17.1 19.6 21.0 13.6 11.0 3.0 -0.8 7.7 1998 -6.1 -5.3 1.9 8.7 12.4 18.0 18.8 20.1 16.1 9.4 6.5 2.8 8.6 1999 -2.3 0.8 2.6 7.8 12.7 17.7 18.2 21.7 15.3 10.9 1.9 0.9 9.0 2000 -3.5 -3.4 1.6 10.3 13.5 16.4 20.0 19.9 15.8 8.3 2.1 0.1 8.4 2001 -2.9 -0.4 5.2 10.2 12.3 16.2 18.2 20.0 16.2 9.8 3.5 2.1 9.2 2002 -2.8 -0.3 4.5 7.5 11.1 16.0 19.5 19.2 16.9 12.5 4.1 -5.2 8.6 2003 -2.3 -1.5 1.0 8.3 11.3 15.2 19.4 20.2 15.6 12.6 3.4 -1.4 8.5 2004 -0.3 0.7 4.5 6.4 11.6 17.0 18.1 20.3 15.0 10.5 4.0 -3.2 8.7 2005 -3.7 -4.7 3.6 9.3 11.6 16.1 20.7 19.1 15.8 10.3 3.5 1.8 8.6 MEAN -4.1 -3.1 1.8 7.9 11.7 16.1 19.1 19.4 15.0 9.6 3.6 -0.8 8.0 SD 2.80 3.02 2.15 1.27 1.13 1.10 0.88 1.31 1.14 1.67 1.52 2.27 1.69 =============================================================================================== TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) FORM 6 LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M TEMPERATURE RECORDS LOWEST IN C. YEAR JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL 1987 -13.5 -13.4 -10.4 -9.8 -0.4 2.2 5.0 3.4 -1.0 -4.0 -15.0 -19.4 -19.4 DAY 14 11 22 1 7 4 4 30 30 13 30 31 1988 -25.0 -27.0 -12.0 -7.0 -0.6 3.0 4.8 3.0 1.2 -3.0 -9.6 -21.5 -27.0 DAY 3 7 6 6 7 3 29 26 27 2 15 29 1989 -26.5 -27.5 -13.5 -5.5 -4.2 3.4 8.4 7.4 -1.6 -4.2 -10.6 -13.0 -27.5 DAY 30 3 31 24 1 2 8 30 21 25 22 6 1990 -27.6 -24.6 -20.6 -10.2 -2.2 3.4 4.0 7.0 1.2 -3.6 -6.4 -21.6 -27.6 DAY 26 5 18 3 4 1 8 25 22 19 25 28 1991 -17.5 -21.5 -19.0 -3.2 -2.5 2.0 4.5 6.0 -2.0 -1.0 -9.2 -16.8 -21.5 DAY 1 13 11 15 7 1 13 28 28 6 23 18 1992 -27.6 -25.6 -24.5 -4.4 -6.5 3.0 7.0 3.4 -0.5 -7.0 -14.6 -15.4 -27.6 DAY 28 29 1 8 5 5 17 31 1 8 27 29 1993 -25.0 -21.0 -18.5 -5.0 -1.5 0.5 6.6 6.4 0.0 -7.6 -18.5 -19.6 -25.0 DAY 20 17 13 5 9 23 13 13 28 8 15 6 1994 -18.2 -24.5 -8.4 -5.8 -1.0 1.0 4.4 6.2 -2.0 -5.5 -7.5 -25.0 -25.0 DAY 24 19 3 5 19 6 1 26 21 9 10 7 1995 -12.4 -12.4 -9.2 -4.4 -2.0 -0.8 8.2 8.0 -0.2 -5.2 -14.6 -17.5 -17.5 DAY 25 26 1 7 31 1 3 13 22 27 27 20 1996 -20.5 -22.2 -13.2 -5.2 0.6 2.6 3.0 5.8 0.6 -4.4 -11.0 -11.2 -22.2 DAY 16 4 17 4 2 7 16 27 21 29 13 1 1997 -31.5 -27.6 -23.6 -6.0 -1.5 4.5 7.4 8.0 0.6 -1.8 -8.0 -15.5 -31.5 DAY 29 7 10 12 12 2 8 31 16 30 28 22 1998 -22.5 -22.5 -15.4 -4.8 -2.4 7.2 3.2 8.4 2.0 -4.0 -4.5 -10.0 -22.5 DAY 10 17 2 7 4 4 26 23 29 13 6 20 1999 -18.5 -9.6 -9.6 -4.2 -1.5 3.6 6.6 7.4 -0.6 -2.6 -18.2 -14.6 -18.5 DAY 5 1 6 7 22 3 15 30 24 14 29 2 2000 -21.6 -21.5 -14.0 -3.2 1.4 0.6 4.6 8.6 2.6 -2.0 -10.2 -10.0 -21.6 DAY 18 9 3 2 11 14 23 28 27 16 11 29 2001 -24.5 -12.0 -9.8 -3.0 0.4 1.4 3.4 3.0 1.4 -2.2 -20.6 -9.6 -24.5 DAY 28 1 12 14 27 2 19 13 26 22 20 22 2002 -13.6 -20.0 -13.2 -2.6 -1.2 1.8 7.4 8.2 3.0 -3.0 -9.2 -23.6 -23.6 DAY 28 17 10 14 14 8 31 5 16 23 15 15 2003 -20.0 -13.0 -17.6 -5.0 -2.0 0.4 7.6 8.6 3.4 0.6 -9.6 -21.8 -21.8 DAY 20 24 2 29 9 26 2 26 28 22 15 12 2004 -11.6 -12.0 -10.6 -11.2 1.0 4.0 6.0 8.4 0.0 -3.4 -12.6 -18.8 -18.8 DAY 21 24 17 6 24 15 1 28 21 25 30 19 2005 -17.8 -23.8 -11.0 -5.8 -1.4 3.0 11.4 8.0 3.0 -6.4 -8.0 -15.0 -23.8 DAY 26 13 26 8 23 11 19 19 25 24 24 29 1987-2005 -31.5 -27.6 -24.5 -11.2 -6.5 -0.8 3.0 3.0 -2.0 -7.6 -20.6 -25.0 -31.5 YEAR-DAY 97-29 97- 7 92- 1 4- 6 92- 5 95- 1 96-16 88-26 91-28 93- 8 1-20 94- 7 97 =============================================================================================== TEHRAN 2006,MAY M.(S & A) STATION KHALKHAL (40717) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) FORM 7 LATITUDE 37 38 N LONGITUDE 48 31 E DATA PROCESSING CENTER ELEVATION 1796.0 M