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