STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 0.2 -0.6 7.3 12.0 18.6 22.5 26.0 24.3 20.8 15.3 7.7 4.1 13.2 MINIMUN AIR TEMPERATURE (C) -5.5 -7.4 0.1 3.6 7.1 8.3 12.8 11.2 6.2 3.2 -1.4 -3.0 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 17 20 7 3 0 0 0 0 0 0 10 13 70 DAYS WITH FREEZING MIN.<= 0 29 26 15 6 0 0 0 0 0 2 18 21 117 TEMPERATURE RECORDS LOWEST(C) -18.0 -22.6 -8.0 -7.0 1.0 3.6 8.4 7.6 3.0 -1.4 -9.6 -14.4 -22.6 DAY 20 6 17 3 8 26 2 12 1 12 24 29 MAXIMUM AIR TEMPERATURE (C) 5.2 4.6 12.1 17.0 24.1 28.5 32.3 30.3 27.8 21.9 13.6 9.2 18.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 6 26 24 6 0 0 0 62 DAYS WITH MAXIMUM TEMP. <= 0 3 4 0 0 0 0 0 0 0 0 0 2 9 TEMPERATURE RECORDS HIGHEST(C) 12.6 10.6 18.0 21.6 29.0 31.4 35.6 33.4 32.2 24.2 19.6 15.6 35.6 DAY 5 29 30 20 27 13 23 20 11 7 3 5 DIF. BETWEEN (MAX.-MIN.) (C) 10.7 12.0 12.0 13.4 17.0 20.2 19.5 19.1 21.6 18.7 15.0 12.2 16.0 MEAN DAILY TEMP. (MDT) (C) -0.1 -1.4 6.1 10.3 15.6 18.4 22.5 20.8 17.0 12.5 6.1 3.1 10.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.2 57.3 13.4 0.0 0.0 0.0 0.0 70.9 HEATING DEG. DAYS(BASE 18 0C) 562.5 562.3 370.1 231.6 77.3 8.2 0.0 0.0 41.3 169.3 356.2 463.0 2841.8 DEWPOINT (MEAN C) -5.9 -6.3 -3.3 -0.0 2.6 -5.4 2.8 0.2 -4.5 -4.4 -5.1 -7.1 -3.0 MIXING RATIO (G/KG) 3.38 3.31 4.18 5.24 6.15 3.46 6.29 5.21 3.71 3.75 3.52 3.05 4.27 VAPOUR PRESSURE (HPA) 4.19 4.10 5.16 6.49 7.63 4.29 7.74 6.44 4.61 4.68 4.39 3.80 5.29 SATURATION DEF. (HPA) 2.35 2.33 5.58 8.24 14.96 24.53 28.04 25.73 21.95 13.86 6.89 4.86 13.28 RELATIVE HUMIDITY (MEAN %) 68 70 53 49 38 18 25 23 21 29 44 47 40 RELATIVE HUMIDITY (MAX. %) 84 86 75 70 59 39 47 42 38 47 66 66 60 RELATIVE HUMIDITY (MIN. %) 51 55 37 34 26 9 15 14 12 18 28 33 28 RELATIVE HUMIDITY (MEAN% 03UTC) 80 84 71 69 58 39 46 42 38 47 64 62 58 RELATIVE HUMIDITY (MEAN% 09UTC) 61 64 45 38 31 12 18 17 14 21 35 38 33 RELATIVE HUMIDITY (MEAN% 15UTC) 65 68 49 44 31 13 19 17 16 26 42 46 36 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 23.5 44.9 46.6 23.2 0.2 0.6 0.3 0.0 0.0 1.0 35.1 25.7 201.1 DAYS WITH PRECIPITATION >=10 1 2 1 0 0 0 0 0 0 0 2 0 6 DAYS WITH PRECIPITATION >= 5 1 3 2 2 0 0 0 0 0 0 2 3 13 DAYS WITH PRECIPITATION >= 1 4 5 6 4 0 0 0 0 0 1 5 5 30 DAYS WITH PRECIPITATION 7 6 7 7 2 1 1 0 0 1 6 5 43 GREATEST DAILY PRECIPITATION 15.0 21.0 31.0 8.0 0.2 0.6 0.3 0.0 0.0 1.0 15.0 9.0 31.0 DAY 18 3 9 27 5 7 28 ** ** 15 14 26 DAY WITH THUNDER STORM 0 1 0 0 0 0 0 0 0 0 0 0 1 DAYS WITH SNOW OR SLEET 6 3 0 0 0 0 0 0 0 0 1 2 12 DAYS WITH DUST 0 0 0 0 0 2 0 1 0 2 0 1 6 WIND DIRECTION (PREVAILING) 225 225 270 270 270 270 270 270 225 270 225 225 270 PREVAILING WIND SPEED(KNOTS) 7.0 8.4 8.7 8.8 8.9 6.4 6.5 9.8 8.3 9.4 9.3 10.2 8.5 PREVAILING WIND PERCENT 12.9 10.3 25.8 19.3 33.5 21.3 12.3 18.7 13.3 22.6 14.0 20.0 17.9 CALMS PERCENT OF WIND 63.2 72.4 40.6 42.0 39.4 52.7 53.5 29.0 43.3 48.4 58.0 51.6 49.4 NO. OF WIND OBSERVATION 155 145 155 150 155 150 155 155 150 155 150 155 1830 VECTOR WIND DIRECTION (MEAN) 234 213 239 233 247 245 196 204 231 263 232 232 235 VECTOR WIND MAGNITUDE(KNOTS) 1.8 1.6 4.9 3.1 4.4 2.1 0.8 2.1 0.7 1.8 2.8 3.7 2.4 WIND STEADINESES (MEAN %) 69.2 72.7 83.1 68.9 83.0 60.0 23.5 33.9 15.6 43.9 77.8 80.4 57.1 WIND SPEED (MEAN KNOTS) 2.6 2.2 5.9 4.5 5.3 3.5 3.4 6.2 4.5 4.1 3.6 4.6 4.2 FASTEST WIND DIRECTION 270 150 250 270 210 260 220 270 150 270 260 250 270 FASTEST WIND SPEED (KNOTS) 23 16 21 19 21 16 16 21 19 23 23 17 23 DAY 29 1 5 1 2 1 19 30 7 21 20 13 DAYS WITH SKY CLEAR (0-2)/8 14 13 19 10 28 27 24 28 30 25 17 13 248 DAYS WITH P.CLOUDY (3-6)/8 11 12 8 16 3 3 7 3 0 6 11 15 95 DAYS WITH CLOUDY (7-8)/8 6 4 4 4 0 0 0 0 0 0 2 3 23 DAYS WITH VISIBILITY =< 2 KM 2 3 0 0 0 0 0 0 0 0 0 0 5 DURATION OF SUNSHINE HOURS 211.9 189.3 254.0 222.8 354.2 367.8 351.6 345.7 329.7 289.0 220.1 198.5 3334.6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 776.1 775.4 774.7 777.7 778.9 776.5 774.4 776.0 779.3 781.8 780.9 777.7 777.5 MAX. QFE PRESSURE IN HPA 784.1 782.2 780.6 783.4 781.9 781.7 781.7 780.5 784.7 786.7 787.0 784.4 787.0 DAY-HOUR 3- 6 7- 6 17- 6 12- 9 17- 6 12- 6 31- 3 21- 6 15- 6 28- 6 6- 6 4- 6 MIN. QFE PRESSURE IN HPA 769.9 769.1 768.4 772.7 774.5 770.9 770.0 771.8 775.5 777.0 774.5 764.3 764.3 DAY-HOUR 19- 3 3-12 23-12 25-15 1- 3 30-12 18-12 24-12 17-12 30-12 30-12 27- 9 MEAN QNH PRESSURE IN HPA 1013.4 1012.6 1011.8 1015.4 1016.9 1014.0 1011.4 1013.4 1017.4 1020.5 1019.4 1015.5 1015.2 MAX. QNH PRESSURE IN HPA 1023.4 1021.1 1019.1 1022.5 1020.7 1020.4 1020.4 1018.9 1024.2 1026.6 1027.0 1023.8 1027.0 DAY-HOUR 3- 6 7- 6 17- 6 12- 9 17- 6 12- 6 31- 3 21- 6 15- 6 28- 6 6- 6 4- 6 MIN. QNH PRESSURE IN HPA 1005.8 1004.8 1003.9 1009.3 1011.5 1007.0 1005.9 1008.1 1012.7 1014.6 1011.5 998.8 998.8 DAY-HOUR 19- 3 3-12 23-12 25-15 1- 3 30-12 18-12 24-12 17-12 30-12 30-12 27- 9 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 775.9 775.3 774.7 777.5 779.0 777.0 775.1 776.7 779.9 782.2 781.1 777.8 777.7 MAX. QFE PRESSURE IN HPA 782.9 781.1 779.9 781.4 781.8 781.3 781.7 779.7 784.2 785.8 786.0 783.5 786.0 DAY 3 7 17 9 17 13 31 21 15 28 6 4 MIN. QFE PRESSURE IN HPA 769.9 769.6 768.8 773.2 774.5 771.7 771.5 774.0 777.4 778.5 775.2 765.0 765.0 DAY 19 17 5 25 1 30 18 3 4 31 29 27 MEAN QNH PRESSURE IN HPA 1013.3 1012.5 1011.7 1015.3 1017.0 1014.6 1012.3 1014.2 1018.2 1021.0 1019.7 1015.6 1015.4 MAX. QNH PRESSURE IN HPA 1021.9 1019.7 1018.2 1020.1 1020.6 1019.9 1020.4 1018.0 1023.5 1025.5 1025.8 1022.7 1025.8 DAY 3 7 17 9 17 13 31 21 15 28 6 4 MIN. QNH PRESSURE IN HPA 1005.8 1005.4 1004.4 1009.9 1011.5 1008.0 1007.8 1010.9 1015.1 1016.5 1012.4 999.7 999.7 DAY 19 17 5 25 1 30 18 3 4 31 29 27 MEAN QFF PRESSURE IN HPA 1015.6 1015.6 1007.2 1006.9 1003.4 998.1 992.6 996.5 1004.5 1011.7 1016.2 1014.6 1006.9 MAX. QFF PRESSURE IN HPA 1028.8 1037.2 1019.4 1018.3 1009.4 1003.8 1002.6 1001.7 1009.4 1018.0 1023.7 1029.2 1037.2 DAY 11 7 15 3 8 7 31 12 25 28 26 30 MIN. QFF PRESSURE IN HPA 1002.9 1002.5 998.8 999.7 998.0 990.9 987.9 989.6 998.6 1004.8 1006.6 997.2 987.9 DAY 7 17 23 25 1 30 16 3 12 21 29 27 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 776.8 776.4 775.5 778.5 779.6 777.3 775.3 777.0 780.4 782.9 782.1 778.8 778.4 MAX. QFE PRESSURE IN HPA 784.1 782.2 780.6 782.8 781.9 781.7 781.7 780.5 784.7 786.7 787.0 784.4 787.0 DAY 3 7 17 9 17 12 31 21 15 28 6 4 MIN. QFE PRESSURE IN HPA 770.9 771.0 769.3 773.9 776.4 771.8 771.6 774.3 777.8 779.3 776.4 765.2 765.2 DAY 19 17 5 25 1 30 18 24 1 31 29 27 MEAN QNH PRESSURE IN HPA 1014.4 1013.8 1012.8 1016.4 1017.8 1015.0 1012.5 1014.6 1018.9 1021.9 1021.0 1016.8 1016.3 MAX. QNH PRESSURE IN HPA 1023.4 1021.1 1019.1 1021.8 1020.7 1020.4 1020.4 1018.9 1024.2 1026.6 1027.0 1023.8 1027.0 DAY 3 7 17 9 17 12 31 21 15 28 6 4 MIN. QNH PRESSURE IN HPA 1007.0 1007.1 1005.0 1010.8 1013.9 1008.1 1007.9 1011.2 1015.6 1017.5 1013.9 999.9 999.9 DAY 19 17 5 25 1 30 18 24 1 31 29 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 776.3 775.8 775.1 778.1 779.2 776.7 774.6 776.2 779.5 781.8 781.0 777.7 777.6 MAX. QFE PRESSURE IN HPA 783.3 781.6 779.8 783.4 781.4 781.3 780.6 779.6 783.4 785.5 786.7 783.3 786.7 DAY 10 7 17 12 17 12 31 21 15 28 3 5 MIN. QFE PRESSURE IN HPA 770.9 770.2 769.8 773.3 776.6 771.2 771.0 773.1 776.8 777.7 775.7 764.3 764.3 DAY 19 3 5 25 19 30 18 24 17 30 29 27 MEAN QNH PRESSURE IN HPA 1013.7 1013.0 1012.2 1015.9 1017.3 1014.2 1011.6 1013.6 1017.6 1020.6 1019.5 1015.5 1015.4 MAX. QNH PRESSURE IN HPA 1022.4 1020.3 1018.1 1022.5 1020.1 1019.9 1019.1 1017.8 1022.5 1025.1 1026.6 1022.4 1026.6 DAY 10 7 17 12 17 12 31 21 15 28 3 5 MIN. QNH PRESSURE IN HPA 1007.0 1006.2 1005.7 1010.0 1014.1 1007.4 1007.1 1009.8 1014.4 1015.5 1013.0 998.8 998.8 DAY 19 3 5 25 19 30 18 24 17 30 29 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 775.4 774.6 774.0 777.1 778.3 775.8 773.6 775.1 778.3 780.8 780.0 776.9 776.7 MAX. QFE PRESSURE IN HPA 782.0 780.2 778.1 781.9 781.7 780.0 779.4 778.0 782.1 784.2 784.6 782.0 784.6 DAY 10 7 17 12 4 12 31 21 15 28 5 5 MIN. QFE PRESSURE IN HPA 770.8 769.1 768.4 772.9 775.8 770.9 770.0 771.8 775.5 777.0 774.5 764.7 764.7 DAY 26 3 23 25 19 30 18 24 17 30 30 27 MEAN QNH PRESSURE IN HPA 1012.7 1011.7 1010.9 1014.8 1016.3 1013.1 1010.4 1012.3 1016.2 1019.3 1018.3 1014.5 1014.2 MAX. QNH PRESSURE IN HPA 1020.8 1018.6 1016.0 1020.7 1020.4 1018.3 1017.6 1015.8 1020.9 1023.5 1024.0 1020.8 1024.0 DAY 10 7 17 12 4 12 31 21 15 28 5 5 MIN. QNH PRESSURE IN HPA 1006.9 1004.8 1003.9 1009.5 1013.1 1007.0 1005.9 1008.1 1012.7 1014.6 1011.5 999.3 999.3 DAY 26 3 23 25 19 30 18 24 17 30 30 27 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 776.0 775.1 774.4 777.3 778.4 775.8 773.6 775.1 778.4 781.2 780.4 777.6 776.9 MAX. QFE PRESSURE IN HPA 782.5 780.1 778.2 782.0 781.8 779.5 779.2 777.7 782.2 784.9 785.4 782.4 785.4 DAY 3 7 17 12 3 12 30 21 14 28 5 5 MIN. QFE PRESSURE IN HPA 771.0 770.5 768.7 772.7 776.0 770.9 770.2 771.9 775.7 777.2 774.8 766.6 766.6 DAY 26 17 23 25 23 30 18 2 17 7 30 27 MEAN QNH PRESSURE IN HPA 1013.3 1012.2 1011.4 1014.9 1016.3 1013.1 1010.3 1012.2 1016.3 1019.8 1018.8 1015.3 1014.5 MAX. QNH PRESSURE IN HPA 1021.4 1018.4 1016.1 1020.8 1020.6 1017.7 1017.3 1015.5 1021.1 1024.4 1025.0 1021.3 1025.0 DAY 3 7 17 12 3 12 30 21 14 28 5 5 MIN. QNH PRESSURE IN HPA 1007.1 1006.5 1004.3 1009.3 1013.4 1007.0 1006.2 1008.3 1013.0 1014.8 1011.9 1001.7 1001.7 DAY 26 17 23 25 23 30 18 2 17 7 30 27 MEAN QFF PRESSURE IN HPA 1015.5 1015.2 1006.8 1006.4 1002.5 996.7 990.6 994.5 1002.5 1010.5 1015.4 1014.3 1005.9 MAX. QFF PRESSURE IN HPA 1028.8 1036.4 1015.3 1016.7 1008.3 1001.2 998.9 999.0 1006.3 1016.4 1021.8 1029.4 1036.4 DAY 20 7 17 3 8 7 31 12 25 28 25 29 MIN. QFF PRESSURE IN HPA 1005.3 1003.4 1000.3 998.8 997.7 990.7 985.8 988.3 996.3 1004.7 1006.3 1000.4 985.8 DAY 26 23 23 25 19 30 16 2 11 7 28 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 BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -4.6 -2.6 5.4 11.0 16.9 24.0 23.9 23.1 20.6 15.1 8.1 2.3 11.9 MINIMUN AIR TEMPERATURE (C) -11.2 -9.6 -1.4 1.5 5.6 9.4 12.2 11.4 7.5 2.2 0.3 -3.7 2.0 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 25 21 8 4 0 0 0 0 0 0 4 18 80 DAYS WITH FREEZING MIN.<= 0 31 26 21 10 1 0 0 0 0 3 17 23 132 TEMPERATURE RECORDS LOWEST(C) -20.0 -20.4 -9.6 -5.0 0.0 4.0 8.4 9.0 2.5 -2.0 -6.0 -11.5 -20.4 DAY 16 7 31 2 2 13 25 8 24 24 24 18 MAXIMUM AIR TEMPERATURE (C) 1.0 2.6 10.1 16.4 22.0 29.7 31.2 30.6 27.0 22.1 13.0 7.0 17.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 15 19 26 5 0 0 0 65 DAYS WITH MAXIMUM TEMP. <= 0 9 8 1 0 0 0 0 0 0 0 0 0 18 TEMPERATURE RECORDS HIGHEST(C) 6.6 10.4 14.8 22.4 29.4 34.0 35.0 32.2 31.2 27.0 16.4 11.0 35.0 DAY 2 28 7 16 30 27 3 28 2 9 5 1 DIF. BETWEEN (MAX.-MIN.) (C) 12.2 12.2 11.5 14.9 16.4 20.3 19.0 19.2 19.5 19.9 12.7 10.7 15.7 MEAN DAILY TEMP. (MDT) (C) -5.1 -3.5 4.3 9.0 13.8 19.6 21.7 21.0 17.3 12.2 6.7 1.7 9.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 5.9 42.2 12.4 0.1 0.0 0.0 0.0 60.6 HEATING DEG. DAYS(BASE 18 0C) 716.3 576.4 423.4 270.7 132.0 6.8 0.2 0.0 45.4 181.2 340.4 505.4 3198.1 DEWPOINT (MEAN C) -12.4 -11.1 -5.7 -3.2 -0.5 -0.7 3.9 1.9 1.9 -1.1 -2.5 -4.8 -2.9 MIXING RATIO (G/KG) 2.03 2.32 3.43 4.21 4.90 4.81 7.03 5.78 5.99 4.69 4.44 3.55 4.43 VAPOUR PRESSURE (HPA) 2.52 2.88 4.24 5.23 6.10 5.97 8.67 7.16 7.42 5.85 5.53 4.41 5.50 SATURATION DEF. (HPA) 2.13 2.58 5.24 8.69 14.64 25.70 25.78 25.47 18.74 12.74 5.66 3.08 12.54 RELATIVE HUMIDITY (MEAN %) 56 54 50 43 36 22 27 25 31 36 53 62 41 RELATIVE HUMIDITY (MAX. %) 68 68 70 72 68 41 42 40 44 50 70 80 59 RELATIVE HUMIDITY (MIN. %) 45 42 35 27 22 14 20 18 23 26 37 45 30 RELATIVE HUMIDITY (MEAN% 03UTC) 64 65 66 71 67 41 40 40 44 49 66 78 58 RELATIVE HUMIDITY (MEAN% 09UTC) 52 49 41 30 26 16 22 19 25 29 44 55 34 RELATIVE HUMIDITY (MEAN% 15UTC) 54 52 50 38 27 18 23 20 26 33 51 62 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 18.9 10.5 45.5 21.8 12.9 0.0 0.0 0.0 0.0 0.5 25.6 112.0 247.7 DAYS WITH PRECIPITATION >=10 0 0 1 1 1 0 0 0 0 0 0 2 5 DAYS WITH PRECIPITATION >= 5 2 1 5 2 1 0 0 0 0 0 3 3 17 DAYS WITH PRECIPITATION >= 1 3 4 11 4 2 0 0 0 0 0 6 7 37 DAYS WITH PRECIPITATION 10 7 11 8 4 0 0 0 0 1 8 7 56 GREATEST DAILY PRECIPITATION 8.0 5.0 10.0 10.1 11.0 0.0 0.0 0.0 0.0 0.5 6.2 72.0 72.0 DAY 3 19 19 29 8 ** ** ** ** 31 2 4 DAY WITH THUNDER STORM 0 0 0 4 0 0 0 0 0 0 0 1 5 DAYS WITH SNOW OR SLEET 8 4 4 0 0 0 0 0 0 0 0 3 19 DAYS WITH DUST 0 0 4 0 4 6 3 2 6 0 0 0 25 WIND DIRECTION (PREVAILING) 270 270 225 270 270 270 45 90 225 270 270 180 270 PREVAILING WIND SPEED(KNOTS) 8.1 6.3 9.7 6.8 9.8 11.4 12.0 9.0 10.8 7.7 11.3 13.8 9.4 PREVAILING WIND PERCENT 9.7 11.4 18.7 11.3 16.1 18.7 12.9 9.0 13.3 7.7 12.7 8.4 10.5 CALMS PERCENT OF WIND 72.3 65.7 47.7 60.0 69.0 65.3 63.2 72.3 61.3 67.1 64.0 79.4 65.6 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 223 234 222 316 271 255 49 52 246 201 236 204 238 VECTOR WIND MAGNITUDE(KNOTS) 1.4 1.3 3.4 0.2 2.2 2.8 1.8 1.1 1.7 0.4 2.4 2.1 1.1 WIND STEADINESES (MEAN %) 66.7 56.5 72.3 5.9 73.3 75.7 48.6 42.3 43.6 16.7 66.7 84.0 34.4 WIND SPEED (MEAN KNOTS) 2.1 2.3 4.7 3.4 3.0 3.7 3.7 2.6 3.9 2.4 3.6 2.5 3.2 FASTEST WIND DIRECTION 200 250 240 240 320 280 240 10 240 220 280 160 240 FASTEST WIND SPEED (KNOTS) 14 16 17 16 16 17 17 16 17 16 16 16 17 DAY 4 11 14 14 4 10 16 20 18 21 18 1 DAYS WITH SKY CLEAR (0-2)/8 21 19 12 12 22 30 30 25 29 26 16 21 263 DAYS WITH P.CLOUDY (3-6)/8 8 7 16 13 5 0 1 5 1 5 9 7 77 DAYS WITH CLOUDY (7-8)/8 2 2 3 5 4 0 0 1 0 0 5 3 25 DAYS WITH VISIBILITY =< 2 KM 1 0 2 0 0 0 0 0 0 0 0 1 4 DURATION OF SUNSHINE HOURS 245.7 229.2 219.9 227.2 306.2 379.7 365.3 312.0 316.6 290.8 200.0 221.5 3314.1 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 774.8 776.5 774.7 779.0 779.6 777.4 777.4 777.5 779.2 782.0 781.0 777.7 778.1 MAX. QFE PRESSURE IN HPA 780.3 781.7 781.0 783.7 782.5 781.4 781.6 781.5 786.0 787.4 785.8 782.2 787.4 DAY-HOUR 22- 6 8- 6 8- 6 9- 6 13- 9 4- 6 20- 6 26- 6 24- 6 27- 6 29- 6 1- 6 MIN. QFE PRESSURE IN HPA 768.2 766.5 766.7 775.4 776.7 774.4 773.3 771.6 774.6 777.8 777.0 773.5 766.5 DAY-HOUR 17- 3 14- 3 15-15 6-12 16-12 30-15 5-15 1-15 12-12 1-12 16-12 5- 9 MEAN QNH PRESSURE IN HPA 1011.8 1014.0 1011.7 1017.1 1017.8 1015.1 1015.1 1015.3 1017.3 1020.8 1019.6 1015.4 1015.9 MAX. QNH PRESSURE IN HPA 1018.7 1020.4 1019.6 1022.9 1021.4 1020.1 1020.3 1020.2 1025.8 1027.5 1025.5 1021.1 1027.5 DAY-HOUR 22- 6 8- 6 8- 6 9- 6 13- 9 4- 6 20- 6 26- 6 24- 6 27- 6 29- 6 1- 6 MIN. QNH PRESSURE IN HPA 1003.7 1001.6 1001.8 1012.6 1014.2 1011.4 1010.0 1007.9 1011.6 1015.6 1014.6 1010.3 1001.6 DAY-HOUR 17- 3 14- 3 15-15 6-12 16-12 30-15 5-15 1-15 12-12 1-12 16-12 5- 9 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 774.6 776.1 774.6 779.2 779.9 777.9 778.1 778.3 779.9 782.5 781.2 777.7 778.3 MAX. QFE PRESSURE IN HPA 778.8 780.9 780.2 783.0 781.8 781.0 781.3 781.0 785.2 786.4 785.2 781.5 786.4 DAY 19 8 8 10 24 4 20 8 24 27 29 19 MIN. QFE PRESSURE IN HPA 768.2 766.5 767.2 776.0 777.8 775.0 775.0 773.6 775.9 779.1 778.1 774.4 766.5 DAY 17 14 30 6 11 17 6 2 13 2 16 5 MEAN QNH PRESSURE IN HPA 1011.6 1013.5 1011.7 1017.3 1018.2 1015.7 1015.9 1016.2 1018.1 1021.4 1019.8 1015.5 1016.2 MAX. QNH PRESSURE IN HPA 1016.8 1019.4 1018.6 1022.0 1020.6 1019.6 1019.9 1019.6 1024.8 1026.3 1024.8 1020.2 1026.3 DAY 19 8 8 10 24 4 20 8 24 27 29 19 MIN. QNH PRESSURE IN HPA 1003.7 1001.6 1002.4 1013.4 1015.6 1012.1 1012.1 1010.4 1013.2 1017.2 1016.0 1011.4 1001.6 DAY 17 14 30 6 11 17 6 2 13 2 16 5 MEAN QFF PRESSURE IN HPA 1018.7 1019.1 1008.8 1010.6 1006.0 998.2 996.9 998.3 1004.1 1012.5 1015.2 1015.8 1008.7 MAX. QFF PRESSURE IN HPA 1031.0 1033.0 1021.1 1018.8 1011.1 1002.7 1001.4 1002.7 1015.3 1018.4 1023.0 1027.6 1033.0 DAY 19 8 31 2 2 13 29 8 24 27 26 19 MIN. QFF PRESSURE IN HPA 1004.7 1003.7 997.9 1004.8 999.3 992.6 991.1 991.0 996.5 1006.7 1007.0 1008.2 991.0 DAY 17 23 28 30 31 10 5 2 13 31 17 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 775.7 777.2 775.4 779.8 780.4 778.1 778.3 778.6 780.4 783.4 782.0 778.6 779.0 MAX. QFE PRESSURE IN HPA 780.3 781.7 781.0 783.7 782.2 781.4 781.6 781.5 786.0 787.4 785.8 782.2 787.4 DAY 22 8 8 9 13 4 20 26 24 27 29 1 MIN. QFE PRESSURE IN HPA 770.2 769.4 768.3 776.8 778.2 775.2 775.4 773.9 776.6 779.8 779.1 774.7 768.3 DAY 12 14 30 23 11 7 5 2 13 2 16 5 MEAN QNH PRESSURE IN HPA 1013.0 1014.8 1012.7 1018.1 1018.8 1016.0 1016.2 1016.6 1018.8 1022.5 1020.8 1016.6 1017.1 MAX. QNH PRESSURE IN HPA 1018.7 1020.4 1019.6 1022.9 1021.1 1020.1 1020.3 1020.2 1025.8 1027.5 1025.5 1021.1 1027.5 DAY 22 8 8 9 13 4 20 26 24 27 29 1 MIN. QNH PRESSURE IN HPA 1006.2 1005.2 1003.8 1014.4 1016.1 1012.4 1012.6 1010.8 1014.1 1018.1 1017.2 1011.7 1003.8 DAY 12 14 30 23 11 7 5 2 13 2 16 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 775.0 777.0 775.1 779.4 779.8 777.6 777.7 777.8 779.3 782.1 781.1 777.6 778.3 MAX. QFE PRESSURE IN HPA 779.2 781.1 780.6 782.9 782.5 780.3 781.0 781.0 784.9 785.9 784.5 781.4 785.9 DAY 22 8 8 10 13 4 20 26 24 27 28 1 MIN. QFE PRESSURE IN HPA 771.0 770.5 768.8 776.1 777.5 774.7 774.3 773.2 775.8 778.8 778.1 773.5 768.8 DAY 12 14 30 29 11 7 5 2 12 1 16 5 MEAN QNH PRESSURE IN HPA 1012.2 1014.6 1012.2 1017.5 1018.0 1015.4 1015.5 1015.6 1017.5 1020.9 1019.6 1015.4 1016.2 MAX. QNH PRESSURE IN HPA 1017.3 1019.7 1019.1 1021.9 1021.4 1018.7 1019.6 1019.6 1024.4 1025.6 1023.9 1020.1 1025.6 DAY 22 8 8 10 13 4 20 26 24 27 28 1 MIN. QNH PRESSURE IN HPA 1007.1 1006.5 1004.4 1013.5 1015.2 1011.7 1011.2 1009.9 1013.1 1016.8 1016.0 1010.3 1004.4 DAY 12 14 30 29 11 7 5 2 12 1 16 5 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 774.1 776.0 774.1 778.3 778.9 776.8 776.7 776.6 778.1 780.9 780.2 776.9 777.3 MAX. QFE PRESSURE IN HPA 777.8 780.2 778.9 781.9 782.5 779.2 779.8 779.7 783.2 784.2 783.8 780.9 784.2 DAY 19 20 7 9 13 3 20 8 24 27 28 1 MIN. QFE PRESSURE IN HPA 769.9 769.7 768.4 775.4 776.7 774.7 773.6 772.0 774.6 777.8 777.0 773.9 768.4 DAY 4 1 28 6 16 7 5 1 12 1 16 15 MEAN QNH PRESSURE IN HPA 1011.0 1013.4 1011.0 1016.3 1017.0 1014.3 1014.2 1014.1 1016.0 1019.4 1018.6 1014.5 1015.0 MAX. QNH PRESSURE IN HPA 1015.6 1018.6 1017.0 1020.7 1021.4 1017.3 1018.1 1018.0 1022.3 1023.5 1023.0 1019.4 1023.5 DAY 19 20 7 9 13 3 20 8 24 27 28 1 MIN. QNH PRESSURE IN HPA 1005.8 1005.5 1003.9 1012.6 1014.2 1011.7 1010.4 1008.4 1011.6 1015.6 1014.6 1010.8 1003.9 DAY 4 1 28 6 16 7 5 1 12 1 16 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 BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 774.5 776.3 774.3 778.4 778.8 776.7 776.4 776.5 778.3 781.4 780.7 777.5 777.5 MAX. QFE PRESSURE IN HPA 778.6 780.6 779.4 781.5 781.4 779.5 779.5 779.9 783.3 784.7 784.3 781.7 784.7 DAY 18 25 7 9 13 3 20 7 23 27 28 18 MIN. QFE PRESSURE IN HPA 769.5 768.2 766.7 775.4 776.7 774.4 773.3 771.6 774.9 777.8 777.8 774.6 766.7 DAY 11 22 15 6 16 30 5 1 12 1 16 15 MEAN QNH PRESSURE IN HPA 1011.5 1013.8 1011.3 1016.4 1016.9 1014.2 1013.8 1014.0 1016.2 1020.0 1019.2 1015.3 1015.2 MAX. QNH PRESSURE IN HPA 1016.6 1019.1 1017.6 1020.2 1020.1 1017.7 1017.7 1018.2 1022.4 1024.2 1023.7 1020.4 1024.2 DAY 18 25 7 9 13 3 20 7 23 27 28 18 MIN. QNH PRESSURE IN HPA 1005.3 1003.7 1001.8 1012.6 1014.2 1011.4 1010.0 1007.9 1012.0 1015.6 1015.6 1011.6 1001.8 DAY 11 22 15 6 16 30 5 1 12 1 16 15 MEAN QFF PRESSURE IN HPA 1018.6 1019.0 1008.4 1009.5 1004.5 996.5 994.5 995.9 1002.0 1010.9 1014.5 1015.6 1007.5 MAX. QFF PRESSURE IN HPA 1030.1 1033.0 1017.3 1015.8 1010.3 1000.6 999.8 1000.5 1012.6 1015.9 1020.8 1027.5 1033.0 DAY 15 7 31 1 13 3 28 7 23 24 26 18 MIN. QFF PRESSURE IN HPA 1005.6 999.7 995.4 1004.3 998.0 990.0 988.3 989.1 995.5 1005.4 1006.8 1008.3 988.3 DAY 2 22 15 29 31 30 5 1 13 1 16 12 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 BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -2.8 1.2 6.7 12.0 19.3 23.9 25.0 25.7 22.0 14.5 9.3 3.5 13.4 MINIMUN AIR TEMPERATURE (C) -9.4 -4.7 -1.4 3.2 6.8 9.2 12.9 12.3 7.0 1.8 -2.3 -4.9 2.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 26 16 13 2 0 0 0 0 0 0 12 14 83 DAYS WITH FREEZING MIN.<= 0 31 25 20 10 0 0 0 0 0 10 26 26 148 TEMPERATURE RECORDS LOWEST(C) -22.0 -13.0 -9.0 -4.0 2.0 3.6 9.0 9.4 3.0 -2.6 -7.4 -20.4 -22.0 DAY 31 1 21 6 27 2 19 25 20 31 30 28 MAXIMUM AIR TEMPERATURE (C) 1.9 5.3 11.6 16.8 24.4 29.8 30.6 32.0 28.7 20.7 16.2 9.3 18.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 17 21 29 13 0 0 0 80 DAYS WITH MAXIMUM TEMP. <= 0 10 0 0 0 0 0 0 0 0 0 0 3 13 TEMPERATURE RECORDS HIGHEST(C) 8.0 10.0 17.0 24.0 28.8 34.0 33.4 34.2 31.6 25.0 21.0 16.0 34.2 DAY 1 19 10 13 21 30 11 12 4 2 4 1 DIF. BETWEEN (MAX.-MIN.) (C) 11.3 10.0 13.0 13.6 17.6 20.6 17.7 19.7 21.7 18.9 18.5 14.2 16.4 MEAN DAILY TEMP. (MDT) (C) -3.8 0.3 5.1 10.0 15.6 19.5 21.7 22.1 17.9 11.2 6.9 2.2 10.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 6.5 34.2 38.1 0.0 0.0 0.0 0.0 78.8 HEATING DEG. DAYS(BASE 18 0C) 674.9 478.8 399.7 239.9 76.3 8.3 0.0 0.0 27.9 209.4 332.3 490.3 2937.9 DEWPOINT (MEAN C) -8.4 -6.1 -4.5 -3.2 -1.4 -1.9 1.5 2.9 -3.7 -5.0 -7.3 -9.2 -3.8 MIXING RATIO (G/KG) 2.74 3.26 3.80 4.11 4.66 4.40 5.66 6.24 3.92 3.48 2.94 2.57 3.98 VAPOUR PRESSURE (HPA) 3.40 4.03 4.73 5.10 5.78 5.46 7.00 7.72 4.87 4.35 3.67 3.20 4.94 SATURATION DEF. (HPA) 1.86 2.93 5.61 9.86 17.75 25.93 26.11 27.18 23.58 13.33 9.05 5.57 14.06 RELATIVE HUMIDITY (MEAN %) 67 61 50 38 28 20 24 24 20 29 35 46 37 RELATIVE HUMIDITY (MAX. %) 78 78 70 56 51 40 42 37 35 49 59 66 55 RELATIVE HUMIDITY (MIN. %) 56 48 37 28 17 12 16 17 12 18 20 31 26 RELATIVE HUMIDITY (MEAN% 03UTC) 75 76 65 55 49 40 41 37 33 48 59 63 53 RELATIVE HUMIDITY (MEAN% 09UTC) 61 56 44 32 19 14 18 20 14 22 26 36 30 RELATIVE HUMIDITY (MEAN% 15UTC) 67 55 48 35 26 16 19 21 15 26 29 46 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 40.4 42.9 27.9 38.0 2.0 0.0 0.8 0.0 0.0 2.3 3.0 20.1 177.4 DAYS WITH PRECIPITATION >=10 2 1 1 1 0 0 0 0 0 0 0 1 6 DAYS WITH PRECIPITATION >= 5 4 2 2 1 0 0 0 0 0 0 0 1 10 DAYS WITH PRECIPITATION >= 1 5 5 3 4 2 0 0 0 0 1 1 4 25 DAYS WITH PRECIPITATION 7 6 8 4 2 0 1 0 0 2 1 7 38 GREATEST DAILY PRECIPITATION 12.0 27.0 18.0 32.0 1.0 0.0 0.8 0.0 0.0 2.0 3.0 12.5 32.0 DAY 5 5 14 3 12 ** 8 ** ** 29 28 21 DAY WITH THUNDER STORM 0 0 0 0 1 0 0 0 0 0 0 1 2 DAYS WITH SNOW OR SLEET 8 6 2 1 0 0 0 0 0 0 0 3 20 DAYS WITH DUST 0 0 4 1 7 3 6 0 0 6 1 0 28 WIND DIRECTION (PREVAILING) 225 225 225 225 270 225 45 90 45 270 225 270 225 PREVAILING WIND SPEED(KNOTS) 10.6 13.2 11.6 11.7 13.0 10.5 11.1 9.2 9.2 12.0 11.5 12.8 11.4 PREVAILING WIND PERCENT 20.6 16.4 16.1 22.0 18.1 8.7 8.4 12.3 6.7 15.5 7.3 20.0 10.7 CALMS PERCENT OF WIND 73.5 65.0 54.8 44.0 70.3 82.0 69.7 56.1 76.0 71.6 78.7 67.1 67.4 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 229 221 233 239 251 238 97 108 128 257 234 256 235 VECTOR WIND MAGNITUDE(KNOTS) 2.6 3.8 3.7 5.6 3.2 1.7 1.2 0.7 0.6 2.4 1.0 3.1 2.1 WIND STEADINESES (MEAN %) 96.3 84.4 68.5 84.8 84.2 85.0 36.4 20.6 24.0 72.7 43.5 77.5 56.8 WIND SPEED (MEAN KNOTS) 2.7 4.5 5.4 6.6 3.8 2.0 3.3 3.4 2.5 3.3 2.3 4.0 3.7 FASTEST WIND DIRECTION 240 200 180 240 280 210 120 50 250 270 270 280 240 FASTEST WIND SPEED (KNOTS) 16 17 17 21 19 16 17 14 14 16 16 16 21 DAY 10 20 6 16 5 15 7 29 1 4 12 11 DAYS WITH SKY CLEAR (0-2)/8 18 21 15 17 27 29 20 24 30 28 27 23 279 DAYS WITH P.CLOUDY (3-6)/8 10 4 13 11 4 1 11 7 0 3 3 5 72 DAYS WITH CLOUDY (7-8)/8 3 3 3 2 0 0 0 0 0 0 0 3 14 DAYS WITH VISIBILITY =< 2 KM 1 0 0 1 0 0 0 0 0 0 0 1 3 DURATION OF SUNSHINE HOURS 213.2 232.4 258.5 279.9 368.0 371.9 310.9 298.2 333.0 333.0 333.0 344.1 3676.1 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 775.9 774.0 778.2 777.0 778.7 777.3 776.0 777.0 779.1 781.9 781.7 778.8 778.0 MAX. QFE PRESSURE IN HPA 783.3 781.0 785.5 782.4 783.6 782.8 780.9 781.4 783.6 786.7 788.2 786.5 788.2 DAY-HOUR 26- 6 8- 6 10- 6 25- 6 18- 6 4- 6 15- 6 3- 6 26- 6 19- 6 23- 6 5- 6 MIN. QFE PRESSURE IN HPA 770.0 765.1 771.9 771.3 770.6 773.1 769.7 773.7 774.9 776.8 775.9 768.5 765.1 DAY-HOUR 28-12 15-15 19-12 6-12 12-15 27-12 5-12 8-15 4-12 1-12 1-12 25-12 MEAN QNH PRESSURE IN HPA 1013.3 1010.8 1016.0 1014.6 1016.7 1015.0 1013.3 1014.6 1017.1 1020.7 1020.5 1016.9 1015.8 MAX. QNH PRESSURE IN HPA 1022.4 1019.6 1025.1 1021.3 1022.8 1021.8 1019.4 1020.1 1022.8 1026.6 1028.5 1026.4 1028.5 DAY-HOUR 26- 6 8- 6 10- 6 25- 6 18- 6 4- 6 15- 6 3- 6 26- 6 19- 6 23- 6 5- 6 MIN. QNH PRESSURE IN HPA 1005.9 999.8 1008.3 1007.5 1006.6 1009.8 1005.5 1010.5 1012.0 1014.4 1013.2 1004.0 999.8 DAY-HOUR 28-12 15-15 19-12 6-12 12-15 27-12 5-12 8-15 4-12 1-12 1-12 25-12 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 775.8 774.0 778.3 777.2 779.2 777.9 776.7 777.9 779.7 782.4 782.1 779.0 778.3 MAX. QFE PRESSURE IN HPA 782.4 780.0 784.5 781.7 783.3 782.8 780.5 781.2 782.9 786.0 787.2 785.0 787.2 DAY 26 8 10 25 18 5 16 4 26 19 23 5 MIN. QFE PRESSURE IN HPA 771.2 768.5 774.0 772.2 771.0 773.4 771.4 775.5 776.7 778.4 777.6 770.1 768.5 DAY 16 10 19 2 13 27 5 9 4 1 1 25 MEAN QNH PRESSURE IN HPA 1013.1 1010.9 1016.2 1014.8 1017.3 1015.7 1014.2 1015.7 1018.0 1021.3 1020.9 1017.1 1016.3 MAX. QNH PRESSURE IN HPA 1021.3 1018.3 1023.9 1020.4 1022.4 1021.8 1018.9 1019.8 1021.9 1025.8 1027.3 1024.5 1027.3 DAY 26 8 10 25 18 5 16 4 26 19 23 5 MIN. QNH PRESSURE IN HPA 1007.4 1004.0 1010.9 1008.6 1007.1 1010.1 1007.6 1012.7 1014.2 1016.3 1015.3 1006.0 1004.0 DAY 16 10 19 2 13 27 5 9 4 1 1 25 MEAN QFF PRESSURE IN HPA 1018.0 1011.8 1012.8 1006.6 1003.1 998.3 995.2 997.0 1003.1 1012.5 1017.2 1017.5 1007.8 MAX. QFF PRESSURE IN HPA 1033.0 1027.9 1023.6 1014.2 1007.2 1007.2 999.8 1001.0 1010.1 1021.3 1027.3 1038.8 1038.8 DAY 26 1 21 3 15 1 9 4 26 19 23 29 MIN. QFF PRESSURE IN HPA 1005.8 1000.7 1005.3 996.7 995.4 990.7 988.1 992.7 996.4 1002.8 1007.0 1003.7 988.1 DAY 23 20 24 16 12 27 5 10 10 1 12 25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 776.9 774.9 779.0 777.8 779.5 778.2 776.9 778.2 780.3 783.1 783.0 780.0 779.0 MAX. QFE PRESSURE IN HPA 783.3 781.0 785.5 782.4 783.6 782.8 780.9 781.4 783.6 786.7 788.2 786.5 788.2 DAY 26 8 10 25 18 4 15 3 26 19 23 5 MIN. QFE PRESSURE IN HPA 772.1 768.5 773.4 772.4 771.9 773.9 771.4 775.7 777.0 778.4 778.0 771.2 768.5 DAY 17 10 19 16 13 27 5 9 4 14 1 25 MEAN QNH PRESSURE IN HPA 1014.5 1011.9 1017.1 1015.6 1017.7 1016.1 1014.5 1016.1 1018.7 1022.1 1022.0 1018.4 1017.1 MAX. QNH PRESSURE IN HPA 1022.4 1019.6 1025.1 1021.3 1022.8 1021.8 1019.4 1020.1 1022.8 1026.6 1028.5 1026.4 1028.5 DAY 26 8 10 25 18 4 15 3 26 19 23 5 MIN. QNH PRESSURE IN HPA 1008.5 1004.0 1010.1 1008.9 1008.3 1010.8 1007.6 1013.0 1014.6 1016.3 1015.8 1007.4 1004.0 DAY 17 10 19 16 13 27 5 9 4 14 1 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 776.1 774.2 778.5 777.1 778.9 777.5 776.1 777.1 779.3 781.9 781.8 778.7 778.1 MAX. QFE PRESSURE IN HPA 782.5 780.4 784.5 781.7 782.9 782.2 780.2 780.5 782.6 785.3 786.6 785.2 786.6 DAY 26 8 10 25 18 4 15 4 26 19 23 5 MIN. QFE PRESSURE IN HPA 770.8 767.5 772.6 771.7 771.6 773.9 770.7 774.9 775.9 777.4 776.8 770.0 767.5 DAY 28 10 19 16 12 27 5 1 4 14 1 25 MEAN QNH PRESSURE IN HPA 1013.5 1011.1 1016.5 1014.7 1016.9 1015.2 1013.5 1014.8 1017.4 1020.7 1020.5 1016.7 1016.0 MAX. QNH PRESSURE IN HPA 1021.4 1018.8 1023.9 1020.4 1021.9 1021.1 1018.6 1018.9 1021.5 1024.9 1026.5 1024.8 1026.5 DAY 26 8 10 25 18 4 15 4 26 19 23 5 MIN. QNH PRESSURE IN HPA 1006.9 1002.8 1009.1 1008.0 1007.9 1010.8 1006.8 1012.0 1013.2 1015.1 1014.4 1005.9 1002.8 DAY 28 10 19 16 12 27 5 1 4 14 1 25 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 775.2 773.2 777.3 776.2 777.9 776.5 775.1 776.0 778.0 780.9 780.6 777.9 777.1 MAX. QFE PRESSURE IN HPA 782.0 778.8 783.1 780.0 781.5 781.3 779.3 779.6 781.2 784.3 785.6 783.9 785.6 DAY 26 8 9 27 18 4 15 4 26 15 23 5 MIN. QFE PRESSURE IN HPA 770.0 767.1 771.9 771.3 771.5 773.1 769.7 774.0 774.9 776.8 775.9 768.5 767.1 DAY 28 10 19 6 13 27 5 1 4 1 1 25 MEAN QNH PRESSURE IN HPA 1012.4 1009.9 1015.0 1013.6 1015.7 1013.9 1012.2 1013.3 1015.8 1019.4 1019.1 1015.7 1014.7 MAX. QNH PRESSURE IN HPA 1020.8 1016.8 1022.2 1018.3 1020.2 1019.9 1017.5 1017.8 1019.8 1023.7 1025.3 1023.2 1025.3 DAY 26 8 9 27 18 4 15 4 26 15 23 5 MIN. QNH PRESSURE IN HPA 1005.9 1002.3 1008.3 1007.5 1007.8 1009.8 1005.5 1010.9 1012.0 1014.4 1013.2 1004.0 1002.3 DAY 28 10 19 6 13 27 5 1 4 1 1 25 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 775.7 773.6 777.7 776.6 778.0 776.5 775.0 776.0 778.1 781.5 781.3 778.5 777.4 MAX. QFE PRESSURE IN HPA 782.5 778.8 784.2 780.1 781.5 781.0 778.9 779.6 781.2 785.1 786.2 784.8 786.2 DAY 26 8 9 24 18 4 15 4 26 15 22 5 MIN. QFE PRESSURE IN HPA 770.7 765.1 772.4 772.2 770.6 773.3 769.7 773.7 774.9 777.8 776.2 768.6 765.1 DAY 17 15 19 9 12 25 5 8 4 1 1 25 MEAN QNH PRESSURE IN HPA 1013.0 1010.3 1015.5 1014.1 1015.9 1014.0 1012.1 1013.3 1015.9 1020.2 1019.9 1016.5 1015.1 MAX. QNH PRESSURE IN HPA 1021.4 1016.8 1023.5 1018.4 1020.2 1019.6 1017.0 1017.8 1019.8 1024.7 1026.0 1024.3 1026.0 DAY 26 8 9 24 18 4 15 4 26 15 22 5 MIN. QNH PRESSURE IN HPA 1006.8 999.8 1008.9 1008.6 1006.6 1010.0 1005.5 1010.5 1012.0 1015.6 1013.6 1004.2 999.8 DAY 17 15 19 9 12 25 5 8 4 1 1 25 MEAN QFF PRESSURE IN HPA 1018.0 1010.9 1011.9 1005.8 1001.4 996.4 993.1 994.3 1000.9 1011.4 1016.2 1016.9 1006.4 MAX. QFF PRESSURE IN HPA 1035.1 1021.5 1021.2 1012.4 1005.2 1004.6 998.4 998.9 1007.8 1019.5 1026.4 1040.2 1040.2 DAY 26 8 21 3 16 1 20 4 26 19 23 28 MIN. QFF PRESSURE IN HPA 1007.9 997.5 1004.3 996.8 993.5 990.3 986.1 990.4 995.0 1001.8 1007.5 1001.1 986.1 DAY 28 15 24 15 12 30 5 8 4 1 1 25 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 BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 1.1 2.0 6.4 12.9 17.4 22.9 26.5 25.1 20.8 13.2 8.1 2.3 13.2 MINIMUN AIR TEMPERATURE (C) -5.0 -4.7 -0.7 2.6 5.2 9.0 12.0 10.5 6.6 3.5 -2.0 -2.6 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 19 15 7 2 0 0 0 0 0 0 13 11 67 DAYS WITH FREEZING MIN.<= 0 27 25 18 7 3 0 0 0 0 5 23 20 128 TEMPERATURE RECORDS LOWEST(C) -12.2 -13.0 -7.0 -4.0 -1.0 4.0 8.0 7.2 0.4 -2.4 -7.4 -10.4 -13.0 DAY 26 14 16 8 5 1 3 29 28 31 27 23 MAXIMUM AIR TEMPERATURE (C) 5.5 6.8 11.4 18.1 22.6 28.7 33.1 31.7 27.4 19.2 14.2 6.2 18.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 9 31 28 12 0 0 0 80 DAYS WITH MAXIMUM TEMP. <= 0 1 0 0 0 0 0 0 0 0 0 0 0 1 TEMPERATURE RECORDS HIGHEST(C) 10.4 13.4 18.4 23.4 27.4 31.6 36.6 34.4 32.0 22.0 19.0 11.4 36.6 DAY 20 25 22 27 31 29 9 7 7 8 2 11 DIF. BETWEEN (MAX.-MIN.) (C) 10.5 11.5 12.1 15.5 17.4 19.7 21.1 21.2 20.8 15.7 16.2 8.8 15.9 MEAN DAILY TEMP. (MDT) (C) 0.3 1.1 5.3 10.4 13.9 18.9 22.6 21.1 17.0 11.3 6.1 1.8 10.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.5 49.4 21.4 0.0 0.0 0.0 0.0 72.3 HEATING DEG. DAYS(BASE 18 0C) 550.1 474.5 380.3 228.9 130.2 7.4 0.0 0.0 44.8 206.3 357.3 503.1 2882.8 DEWPOINT (MEAN C) -6.6 -8.3 -4.1 -4.5 -6.6 -3.3 -1.4 -2.8 -4.1 -1.3 -6.7 -5.3 -4.6 MIXING RATIO (G/KG) 3.16 2.89 3.91 3.77 3.24 4.12 4.61 4.13 3.76 4.71 3.09 3.56 3.75 VAPOUR PRESSURE (HPA) 3.93 3.59 4.84 4.69 4.03 5.11 5.71 5.12 4.69 5.88 3.85 4.42 4.65 SATURATION DEF. (HPA) 2.95 3.79 5.27 11.11 16.91 24.33 31.17 29.02 22.00 10.03 7.66 3.04 13.94 RELATIVE HUMIDITY (MEAN %) 59 51 52 35 22 20 19 18 22 43 38 61 37 RELATIVE HUMIDITY (MAX. %) 77 74 77 62 43 39 36 35 37 70 61 76 57 RELATIVE HUMIDITY (MIN. %) 45 35 35 20 12 12 10 10 14 26 22 46 24 RELATIVE HUMIDITY (MEAN% 03UTC) 72 71 74 60 42 39 36 35 37 67 58 68 55 RELATIVE HUMIDITY (MEAN% 09UTC) 52 41 40 26 15 14 12 12 16 30 27 53 28 RELATIVE HUMIDITY (MEAN% 15UTC) 61 49 48 29 17 17 13 13 19 41 36 65 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 59.2 30.1 88.3 4.7 1.0 0.5 0.0 0.0 0.0 28.1 2.0 123.7 337.6 DAYS WITH PRECIPITATION >=10 3 0 3 0 0 0 0 0 0 1 0 5 12 DAYS WITH PRECIPITATION >= 5 4 3 5 0 0 0 0 0 0 2 0 7 21 DAYS WITH PRECIPITATION >= 1 8 6 8 2 1 0 0 0 0 5 1 13 44 DAYS WITH PRECIPITATION 10 7 10 6 1 1 0 0 0 6 1 18 60 GREATEST DAILY PRECIPITATION 17.0 8.7 29.0 2.0 1.0 0.5 0.0 0.0 0.0 14.0 2.0 25.0 29.0 DAY 21 28 6 5 3 26 ** ** ** 3 16 14 DAY WITH THUNDER STORM 0 0 1 0 0 2 0 0 0 0 0 0 3 DAYS WITH SNOW OR SLEET 4 4 2 1 0 0 0 0 0 0 0 6 17 DAYS WITH DUST 0 0 2 1 4 1 1 2 4 0 1 0 16 WIND DIRECTION (PREVAILING) 225 270 270 270 270 270 270 90 90 270 270 180 270 PREVAILING WIND SPEED(KNOTS) 10.9 11.7 13.3 11.4 12.5 10.5 10.8 8.9 6.7 7.0 8.7 9.5 10.4 PREVAILING WIND PERCENT 12.3 13.6 16.8 18.7 26.5 15.3 8.4 11.6 16.7 26.5 20.7 28.4 15.6 CALMS PERCENT OF WIND 74.2 55.0 50.3 66.7 54.8 52.7 78.7 74.2 38.0 32.3 24.7 18.7 51.7 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 227 220 234 255 259 274 305 84 111 248 250 212 237 VECTOR WIND MAGNITUDE(KNOTS) 2.4 3.4 4.1 3.3 5.0 1.0 0.2 1.5 0.1 1.8 2.4 4.9 2.1 WIND STEADINESES (MEAN %) 85.7 68.0 66.1 89.2 89.3 21.7 9.1 60.0 1.9 40.9 45.3 67.1 45.7 WIND SPEED (MEAN KNOTS) 2.8 5.0 6.2 3.7 5.6 4.6 2.2 2.5 5.2 4.4 5.3 7.3 4.6 FASTEST WIND DIRECTION 180 200 270 260 270 80 280 70 250 270 260 190 270 FASTEST WIND SPEED (KNOTS) 17 16 29 16 17 17 17 16 17 17 19 23 29 DAY 2 3 19 4 10 18 14 27 19 19 5 12 DAYS WITH SKY CLEAR (0-2)/8 21 12 10 12 22 25 31 31 27 20 22 14 247 DAYS WITH P.CLOUDY (3-6)/8 5 9 13 15 9 5 0 0 3 7 7 11 84 DAYS WITH CLOUDY (7-8)/8 5 7 8 3 0 0 0 0 0 4 1 6 34 DAYS WITH VISIBILITY =< 2 KM 1 0 1 0 0 0 0 0 0 0 0 0 2 DURATION OF SUNSHINE HOURS 226.5 193.7 216.6 260.4 346.4 332.9 363.2 355.4 309.7 252.6 243.6 169.0 3270.0 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 776.6 776.1 775.5 778.7 776.9 777.0 775.4 776.9 780.5 782.0 781.0 776.8 777.8 MAX. QFE PRESSURE IN HPA 783.2 784.6 781.9 784.1 781.8 782.0 779.5 780.9 784.0 786.3 784.8 783.3 786.3 DAY-HOUR 12- 6 15- 6 29- 6 18- 6 9- 6 23- 3 1- 3 23- 6 17- 6 28- 6 2- 6 7- 6 MIN. QFE PRESSURE IN HPA 768.0 769.1 765.8 773.7 772.3 771.9 770.7 772.5 775.8 778.5 776.9 768.0 765.8 DAY-HOUR 26- 3 7-12 6-15 12- 9 23- 3 12-12 14-12 11-12 3-12 15- 9 6-12 22- 3 MEAN QNH PRESSURE IN HPA 1014.0 1013.5 1012.8 1016.8 1014.5 1014.6 1012.6 1014.5 1019.0 1020.8 1019.6 1014.3 1015.6 MAX. QNH PRESSURE IN HPA 1022.3 1024.0 1020.7 1023.4 1020.6 1020.8 1017.7 1019.4 1023.3 1026.1 1024.3 1022.4 1026.1 DAY-HOUR 12- 6 15- 6 29- 6 18- 6 9- 6 23- 3 1- 3 23- 6 17- 6 28- 6 2- 6 7- 6 MIN. QNH PRESSURE IN HPA 1003.4 1004.8 1000.7 1010.5 1008.8 1008.3 1006.8 1009.0 1013.1 1016.5 1014.5 1003.4 1000.7 DAY-HOUR 26- 3 7-12 6-15 12- 9 23- 3 12-12 14-12 11-12 3-12 15- 9 6-12 22- 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 776.6 776.1 775.7 779.1 777.3 777.6 776.3 777.8 781.2 782.4 781.4 776.8 778.2 MAX. QFE PRESSURE IN HPA 782.3 783.4 781.2 783.2 780.9 782.0 779.5 780.6 783.8 786.0 783.9 782.1 786.0 DAY 13 15 29 19 9 23 1 23 17 28 2 8 MIN. QFE PRESSURE IN HPA 768.0 769.2 768.0 774.2 772.3 772.1 771.9 774.5 778.0 779.2 778.2 768.0 768.0 DAY 26 8 7 12 23 12 14 12 4 15 6 22 MEAN QNH PRESSURE IN HPA 1014.1 1013.5 1012.9 1017.2 1015.0 1015.4 1013.7 1015.5 1019.9 1021.3 1020.0 1014.3 1016.1 MAX. QNH PRESSURE IN HPA 1021.2 1022.5 1019.8 1022.3 1019.4 1020.8 1017.7 1019.1 1023.0 1025.8 1023.2 1020.9 1025.8 DAY 13 15 29 19 9 23 1 23 17 28 2 8 MIN. QNH PRESSURE IN HPA 1003.4 1004.9 1003.4 1011.1 1008.8 1008.5 1008.3 1011.5 1015.8 1017.3 1016.1 1003.4 1003.4 DAY 26 8 7 12 23 12 14 12 4 15 6 22 MEAN QFF PRESSURE IN HPA 1015.7 1014.2 1009.2 1008.8 1002.4 998.6 994.2 997.6 1006.1 1013.1 1017.0 1013.9 1007.6 MAX. QFF PRESSURE IN HPA 1026.4 1028.4 1018.9 1015.8 1008.9 1005.4 999.0 1001.9 1013.7 1019.9 1023.0 1024.8 1028.4 DAY 12 16 17 19 25 24 5 23 28 28 27 24 MIN. QFF PRESSURE IN HPA 1003.8 1004.6 999.8 1001.4 997.0 989.6 987.2 990.4 999.2 1004.6 1005.8 1001.5 987.2 DAY 25 8 7 10 17 12 14 11 8 15 5 22 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 777.6 777.0 776.4 779.7 777.7 777.8 776.4 778.0 781.7 783.1 782.3 777.8 778.8 MAX. QFE PRESSURE IN HPA 783.2 784.6 781.9 784.1 781.8 782.0 779.5 780.9 784.0 786.3 784.8 783.3 786.3 DAY 12 15 29 18 9 23 1 23 17 28 2 7 MIN. QFE PRESSURE IN HPA 770.0 770.1 769.0 774.6 774.0 772.3 771.6 774.7 778.0 779.3 779.1 769.4 769.0 DAY 26 8 7 12 23 12 14 11 8 15 8 22 MEAN QNH PRESSURE IN HPA 1015.3 1014.7 1013.9 1018.0 1015.5 1015.6 1013.9 1015.9 1020.5 1022.2 1021.1 1015.6 1016.8 MAX. QNH PRESSURE IN HPA 1022.3 1024.0 1020.7 1023.4 1020.6 1020.8 1017.7 1019.4 1023.3 1026.1 1024.3 1022.4 1026.1 DAY 12 15 29 18 9 23 1 23 17 28 2 7 MIN. QNH PRESSURE IN HPA 1005.9 1006.0 1004.7 1011.6 1010.9 1008.8 1007.9 1011.7 1015.8 1017.5 1017.2 1005.2 1004.7 DAY 26 8 7 12 23 12 14 11 8 15 8 22 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 776.5 776.3 775.8 778.9 777.1 777.1 775.6 777.1 780.6 782.0 780.9 776.7 777.9 MAX. QFE PRESSURE IN HPA 781.7 784.0 781.1 783.5 780.8 781.0 778.6 780.3 782.4 784.9 783.6 782.3 784.9 DAY 12 15 29 18 9 23 2 23 17 20 2 8 MIN. QFE PRESSURE IN HPA 769.5 769.4 768.5 773.7 774.2 772.3 771.3 773.8 777.3 778.5 777.4 770.7 768.5 DAY 25 8 6 12 28 12 14 11 3 15 6 22 MEAN QNH PRESSURE IN HPA 1014.0 1013.7 1013.1 1017.0 1014.7 1014.8 1012.8 1014.7 1019.1 1020.8 1019.4 1014.3 1015.7 MAX. QNH PRESSURE IN HPA 1020.4 1023.3 1019.7 1022.7 1019.3 1019.6 1016.6 1018.7 1021.3 1024.4 1022.8 1021.2 1024.4 DAY 12 15 29 18 9 23 2 23 17 20 2 8 MIN. QNH PRESSURE IN HPA 1005.3 1005.2 1004.0 1010.5 1011.1 1008.8 1007.5 1010.6 1015.0 1016.5 1015.1 1006.8 1004.0 DAY 25 8 6 12 28 12 14 11 3 15 6 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 775.8 775.3 774.7 777.9 776.2 776.1 774.3 775.8 779.4 781.0 780.0 776.0 776.9 MAX. QFE PRESSURE IN HPA 781.3 783.3 779.5 782.4 779.3 780.6 778.0 779.3 781.2 784.0 782.7 782.0 784.0 DAY 12 15 18 19 8 23 2 31 30 20 14 8 MIN. QFE PRESSURE IN HPA 768.7 769.1 766.5 774.0 773.3 771.9 770.7 772.5 775.8 778.5 776.9 768.5 766.5 DAY 25 7 6 11 6 12 14 11 3 15 6 25 MEAN QNH PRESSURE IN HPA 1013.1 1012.5 1011.7 1015.7 1013.6 1013.5 1011.3 1013.1 1017.5 1019.6 1018.3 1013.3 1014.4 MAX. QNH PRESSURE IN HPA 1019.9 1022.4 1017.7 1021.3 1017.5 1019.1 1015.8 1017.5 1019.8 1023.3 1021.7 1020.8 1023.3 DAY 12 15 18 19 8 23 2 31 30 20 14 8 MIN. QNH PRESSURE IN HPA 1004.3 1004.8 1001.6 1010.9 1010.0 1008.3 1006.8 1009.0 1013.1 1016.5 1014.5 1004.0 1001.6 DAY 25 7 6 11 6 12 14 11 3 15 6 25 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 776.4 775.8 775.2 778.1 776.4 776.4 774.4 775.8 779.7 781.7 780.6 776.6 777.3 MAX. QFE PRESSURE IN HPA 781.9 783.6 780.2 782.4 779.5 781.4 778.0 779.8 782.5 784.5 782.9 782.7 784.5 DAY 12 15 29 19 8 23 2 31 29 27 14 8 MIN. QFE PRESSURE IN HPA 768.5 769.1 765.8 774.1 773.5 772.3 771.3 772.5 775.8 779.4 777.4 769.4 765.8 DAY 25 7 6 10 6 11 13 11 3 4 30 25 MEAN QNH PRESSURE IN HPA 1013.8 1013.1 1012.4 1016.0 1013.8 1013.9 1011.4 1013.1 1018.0 1020.5 1019.1 1014.1 1014.9 MAX. QNH PRESSURE IN HPA 1020.7 1022.8 1018.6 1021.3 1017.7 1020.1 1015.8 1018.1 1021.4 1023.9 1021.9 1021.7 1023.9 DAY 12 15 29 19 8 23 2 31 29 27 14 8 MIN. QNH PRESSURE IN HPA 1004.0 1004.8 1000.7 1011.0 1010.3 1008.8 1007.5 1009.0 1013.1 1017.6 1015.1 1005.2 1000.7 DAY 25 7 6 10 6 11 13 11 3 4 30 25 MEAN QFF PRESSURE IN HPA 1015.2 1013.8 1008.6 1007.4 1001.2 997.1 991.9 995.1 1004.3 1012.3 1015.9 1013.8 1006.4 MAX. QFF PRESSURE IN HPA 1026.3 1028.0 1015.9 1012.5 1006.3 1006.0 997.5 1002.1 1012.3 1018.8 1021.9 1025.8 1028.0 DAY 12 15 17 19 8 24 2 31 29 27 24 23 MIN. QFF PRESSURE IN HPA 1004.9 1004.0 996.1 1001.8 997.2 991.1 986.9 988.8 996.4 1007.5 1006.7 1005.1 986.9 DAY 25 7 6 4 18 12 14 11 8 15 5 25 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 BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -5.7 -1.8 2.5 10.0 15.2 21.5 25.5 23.1 18.3 13.3 8.3 2.4 11.1 MINIMUN AIR TEMPERATURE (C) -12.5 -7.7 -3.9 2.6 7.0 9.0 13.2 10.9 5.6 0.2 0.1 -2.6 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 25 21 15 2 0 0 0 0 0 0 8 13 84 DAYS WITH FREEZING MIN.<= 0 31 26 24 11 0 0 0 0 1 17 13 22 145 TEMPERATURE RECORDS LOWEST(C) -26.2 -19.0 -11.2 -4.6 0.4 5.4 9.4 8.0 0.0 -3.2 -9.0 -9.0 -26.2 DAY 29 13 11 5 14 20 12 23 12 30 27 10 MAXIMUM AIR TEMPERATURE (C) -1.3 2.5 6.6 14.4 19.5 26.7 30.8 28.7 23.9 20.0 13.1 6.2 15.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 3 22 13 0 0 0 0 38 DAYS WITH MAXIMUM TEMP. <= 0 14 7 0 0 0 0 0 0 0 0 0 0 21 TEMPERATURE RECORDS HIGHEST(C) 6.2 8.0 13.4 19.6 26.2 32.4 33.4 32.4 26.4 24.2 18.0 12.0 33.4 DAY 20 22 29 21 30 30 1 1 16 2 20 12 DIF. BETWEEN (MAX.-MIN.) (C) 11.2 10.2 10.5 11.8 12.5 17.7 17.6 17.8 18.3 19.8 13.0 8.8 14.1 MEAN DAILY TEMP. (MDT) (C) -6.9 -2.6 1.4 8.5 13.3 17.9 22.0 19.8 14.8 10.1 6.6 1.8 8.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 1.8 41.2 10.9 0.0 0.0 0.0 0.0 53.9 HEATING DEG. DAYS(BASE 18 0C) 771.5 597.1 516.0 285.4 146.2 23.4 0.0 5.3 96.7 244.3 341.6 502.9 3530.4 DEWPOINT (MEAN C) -12.6 -9.9 -8.1 -5.5 -0.7 -1.7 0.7 1.1 -4.9 -5.8 -5.1 -6.3 -4.9 MIXING RATIO (G/KG) 2.05 2.51 2.88 3.51 4.91 4.51 5.31 5.51 3.50 3.37 3.62 3.29 3.75 VAPOUR PRESSURE (HPA) 2.54 3.10 3.56 4.36 6.10 5.59 6.57 6.83 4.37 4.20 4.52 4.08 4.65 SATURATION DEF. (HPA) 1.87 2.57 4.13 8.51 11.86 21.35 27.59 23.20 18.04 12.33 7.00 3.43 11.82 RELATIVE HUMIDITY (MEAN %) 61 56 49 38 38 24 22 26 22 29 43 57 39 RELATIVE HUMIDITY (MAX. %) 73 71 71 60 63 46 38 46 41 48 63 76 58 RELATIVE HUMIDITY (MIN. %) 48 43 33 25 25 14 14 17 14 18 29 41 27 RELATIVE HUMIDITY (MEAN% 03UTC) 69 65 68 57 59 46 38 46 41 48 61 71 56 RELATIVE HUMIDITY (MEAN% 09UTC) 54 48 40 29 30 18 16 19 15 21 32 48 31 RELATIVE HUMIDITY (MEAN% 15UTC) 62 59 47 37 35 19 18 21 19 27 42 59 37 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 41.9 50.4 21.7 21.7 27.8 0.1 0.0 0.0 0.0 0.0 9.6 40.1 213.3 DAYS WITH PRECIPITATION >=10 1 1 1 0 0 0 0 0 0 0 0 1 4 DAYS WITH PRECIPITATION >= 5 3 1 2 2 2 0 0 0 0 0 1 3 14 DAYS WITH PRECIPITATION >= 1 6 6 3 5 7 0 0 0 0 0 2 9 38 DAYS WITH PRECIPITATION 12 7 5 7 8 1 0 0 0 0 4 10 54 GREATEST DAILY PRECIPITATION 15.0 37.0 12.0 8.0 9.2 0.1 0.0 0.0 0.0 0.0 7.0 12.0 37.0 DAY 21 25 31 25 11 7 ** ** ** ** 26 17 DAY WITH THUNDER STORM 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH SNOW OR SLEET 12 6 1 3 0 0 0 0 0 0 1 5 28 DAYS WITH DUST 0 0 0 0 11 7 0 4 4 0 2 0 28 WIND DIRECTION (PREVAILING) 225 225 225 270 270 270 90 90 270 270 225 225 270 PREVAILING WIND SPEED(KNOTS) 7.8 9.0 9.8 9.3 10.7 8.5 6.4 7.8 9.2 6.1 10.2 8.4 8.8 PREVAILING WIND PERCENT 16.8 23.4 26.5 30.7 38.1 26.7 17.4 27.7 21.3 17.4 16.7 23.2 20.5 CALMS PERCENT OF WIND 29.0 18.6 20.0 21.3 18.1 38.0 31.6 24.5 34.0 62.6 47.3 43.2 32.4 NO. OF WIND OBSERVATION 155 145 155 150 155 150 155 155 150 155 150 155 1830 VECTOR WIND DIRECTION (MEAN) 215 229 233 241 251 246 75 70 293 284 230 219 237 VECTOR WIND MAGNITUDE(KNOTS) 2.4 4.5 5.1 6.2 6.0 3.9 0.9 2.1 1.5 0.5 3.1 3.5 2.7 WIND STEADINESES (MEAN %) 49.0 67.2 69.9 80.5 74.1 76.5 22.0 33.3 34.9 22.7 66.0 76.1 49.1 WIND SPEED (MEAN KNOTS) 4.9 6.7 7.3 7.7 8.1 5.1 4.1 6.3 4.3 2.2 4.7 4.6 5.5 FASTEST WIND DIRECTION 160 180 240 240 280 260 30 300 290 280 230 180 280 FASTEST WIND SPEED (KNOTS) 21 23 23 23 35 23 16 19 19 12 31 23 35 DAY 30 24 10 15 20 2 28 12 17 2 25 14 DAYS WITH SKY CLEAR (0-2)/8 18 16 15 10 15 27 23 26 29 31 12 14 236 DAYS WITH P.CLOUDY (3-6)/8 10 11 13 20 15 3 8 5 1 0 18 15 119 DAYS WITH CLOUDY (7-8)/8 3 2 3 0 1 0 0 0 0 0 0 2 11 DAYS WITH VISIBILITY =< 2 KM 2 0 0 0 0 0 0 0 0 0 0 1 3 DURATION OF SUNSHINE HOURS 202.2 230.8 245.2 238.4 290.4 350.9 322.9 335.6 328.0 311.4 204.1 195.0 3254.9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 774.9 773.9 774.9 776.6 778.5 777.1 776.6 777.9 780.9 781.2 781.3 777.1 777.6 MAX. QFE PRESSURE IN HPA 784.8 780.8 781.9 782.0 783.6 783.1 780.9 782.6 784.6 786.1 787.3 783.6 787.3 DAY-HOUR 10- 6 16- 6 13- 6 21- 6 29- 6 11- 6 6- 6 16- 6 22- 6 30- 6 4- 6 1- 6 MIN. QFE PRESSURE IN HPA 764.1 766.1 767.1 769.3 772.6 771.9 771.7 772.5 777.1 775.9 772.5 772.5 764.1 DAY-HOUR 30-15 25- 3 31- 3 18- 3 4-12 27-12 18-15 1-15 6-12 7-12 26- 3 19-12 MEAN QNH PRESSURE IN HPA 1012.0 1010.7 1012.0 1014.1 1016.4 1014.7 1014.0 1015.7 1019.5 1019.8 1019.9 1014.7 1015.3 MAX. QNH PRESSURE IN HPA 1024.3 1019.3 1020.7 1020.8 1022.8 1022.2 1019.4 1021.5 1024.0 1025.9 1027.4 1022.8 1027.4 DAY-HOUR 10- 6 16- 6 13- 6 21- 6 29- 6 11- 6 6- 6 16- 6 22- 6 30- 6 4- 6 1- 6 MIN. QNH PRESSURE IN HPA 998.6 1001.1 1002.3 1005.0 1009.1 1008.3 1008.0 1009.0 1014.7 1013.2 1009.0 1009.0 998.6 DAY-HOUR 30-15 25- 3 31- 3 18- 3 4-12 27-12 18-15 1-15 6-12 7-12 26- 3 19-12 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 774.7 773.7 774.9 776.5 778.7 777.5 777.2 778.6 781.5 781.8 781.5 777.1 777.8 MAX. QFE PRESSURE IN HPA 783.8 779.6 781.1 781.6 783.2 782.7 780.6 782.4 784.1 785.6 786.4 782.4 786.4 DAY 10 16 13 21 29 11 6 16 22 30 4 1 MIN. QFE PRESSURE IN HPA 768.2 766.1 767.1 769.3 773.5 773.5 772.4 774.7 779.1 777.5 772.5 773.0 766.1 DAY 3 25 31 18 4 27 19 2 18 7 26 22 MEAN QNH PRESSURE IN HPA 1011.7 1010.5 1011.9 1014.0 1016.7 1015.3 1014.8 1016.6 1020.2 1020.5 1020.2 1014.7 1015.6 MAX. QNH PRESSURE IN HPA 1023.0 1017.8 1019.7 1020.3 1022.3 1021.7 1019.1 1021.3 1023.4 1025.3 1026.3 1021.3 1026.3 DAY 10 16 13 21 29 11 6 16 22 30 4 1 MIN. QNH PRESSURE IN HPA 1003.7 1001.1 1002.3 1005.0 1010.3 1010.3 1008.9 1011.7 1017.2 1015.2 1009.0 1009.6 1001.1 DAY 3 25 31 18 4 27 19 2 18 7 26 22 MEAN QFF PRESSURE IN HPA 1020.4 1014.6 1012.2 1007.5 1005.4 999.4 995.7 999.6 1008.6 1013.6 1016.0 1014.9 1009.0 MAX. QFF PRESSURE IN HPA 1042.6 1029.8 1026.0 1015.3 1013.4 1007.0 999.6 1007.6 1012.9 1022.7 1026.2 1024.0 1042.6 DAY 10 13 13 20 14 7 16 31 2 30 18 11 MIN. QFF PRESSURE IN HPA 1004.2 998.6 997.9 996.6 998.2 992.5 987.3 992.7 1004.3 1007.0 1004.1 1007.4 987.3 DAY 3 25 31 18 4 28 19 2 18 7 26 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 775.9 774.6 775.8 777.3 779.1 777.8 777.5 779.0 782.0 782.5 782.3 778.1 778.5 MAX. QFE PRESSURE IN HPA 784.8 780.8 781.9 782.0 783.6 783.1 780.9 782.6 784.6 786.1 787.3 783.6 787.3 DAY 10 16 13 21 29 11 6 16 22 30 4 1 MIN. QFE PRESSURE IN HPA 769.6 768.3 768.3 770.1 773.6 773.7 773.0 775.1 779.3 777.9 774.1 774.5 768.3 DAY 25 25 31 18 4 27 19 1 6 7 26 30 MEAN QNH PRESSURE IN HPA 1013.2 1011.7 1013.1 1015.0 1017.1 1015.5 1015.3 1017.1 1020.8 1021.4 1021.2 1015.9 1016.4 MAX. QNH PRESSURE IN HPA 1024.3 1019.3 1020.7 1020.8 1022.8 1022.2 1019.4 1021.5 1024.0 1025.9 1027.4 1022.8 1027.4 DAY 10 16 13 21 29 11 6 16 22 30 4 1 MIN. QNH PRESSURE IN HPA 1005.4 1003.8 1003.8 1006.0 1010.4 1010.5 1009.6 1012.2 1017.5 1015.7 1011.0 1011.5 1003.8 DAY 25 25 31 18 4 27 19 1 6 7 26 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 774.9 774.1 775.2 776.8 778.6 777.2 776.8 778.1 781.1 781.1 781.1 776.8 777.6 MAX. QFE PRESSURE IN HPA 783.5 779.7 781.6 780.9 783.1 782.0 780.0 781.6 783.5 784.8 785.8 782.0 785.8 DAY 10 16 12 21 29 11 6 16 22 29 4 1 MIN. QFE PRESSURE IN HPA 768.0 768.4 769.1 770.8 773.0 773.0 773.0 774.2 778.3 776.4 773.3 772.8 768.0 DAY 30 11 31 18 4 27 19 1 6 7 26 30 MEAN QNH PRESSURE IN HPA 1012.0 1010.9 1012.4 1014.4 1016.6 1014.9 1014.3 1016.0 1019.7 1019.7 1019.6 1014.4 1015.4 MAX. QNH PRESSURE IN HPA 1022.7 1018.0 1020.3 1019.4 1022.2 1020.8 1018.3 1020.3 1022.7 1024.3 1025.5 1020.8 1025.5 DAY 10 16 12 21 29 11 6 16 22 29 4 1 MIN. QNH PRESSURE IN HPA 1003.4 1003.9 1004.8 1006.9 1009.6 1009.6 1009.6 1011.1 1016.2 1013.9 1010.0 1009.4 1003.4 DAY 30 11 31 18 4 27 19 1 6 7 26 30 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 774.3 773.2 774.2 775.9 777.9 776.4 775.7 776.9 780.0 780.1 780.4 776.3 776.8 MAX. QFE PRESSURE IN HPA 782.7 778.9 780.3 780.0 781.9 781.0 778.8 780.3 782.2 783.8 784.7 781.2 784.7 DAY 10 16 12 12 29 7 6 15 2 29 4 1 MIN. QFE PRESSURE IN HPA 765.4 767.6 768.6 770.6 772.6 771.9 772.2 772.8 777.1 775.9 773.7 772.5 765.4 DAY 30 11 22 18 4 27 19 1 6 7 26 19 MEAN QNH PRESSURE IN HPA 1011.2 1009.9 1011.2 1013.3 1015.8 1013.9 1013.0 1014.5 1018.3 1018.4 1018.9 1013.8 1014.3 MAX. QNH PRESSURE IN HPA 1021.7 1017.0 1018.7 1018.3 1020.7 1019.6 1016.8 1018.7 1021.1 1023.0 1024.2 1019.8 1024.2 DAY 10 16 12 12 29 7 6 15 2 29 4 1 MIN. QNH PRESSURE IN HPA 1000.2 1002.9 1004.2 1006.6 1009.1 1008.3 1008.6 1009.4 1014.7 1013.2 1010.5 1009.0 1000.2 DAY 30 11 22 18 4 27 19 1 6 7 26 19 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 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 774.9 773.9 774.6 776.4 778.2 776.6 775.6 777.0 780.2 780.5 781.2 777.2 777.2 MAX. QFE PRESSURE IN HPA 783.0 779.2 780.7 780.9 781.7 781.5 778.7 780.7 782.7 784.4 785.4 782.1 785.4 DAY 10 16 12 21 29 7 6 31 21 29 4 1 MIN. QFE PRESSURE IN HPA 764.1 768.0 769.4 770.6 773.4 771.9 771.7 772.5 777.4 776.2 775.0 772.8 764.1 DAY 30 10 30 18 4 27 18 1 6 7 26 21 MEAN QNH PRESSURE IN HPA 1012.0 1010.7 1011.6 1013.8 1016.0 1014.1 1012.9 1014.6 1018.6 1019.0 1019.8 1014.8 1014.8 MAX. QNH PRESSURE IN HPA 1022.0 1017.3 1019.2 1019.4 1020.4 1020.2 1016.7 1019.2 1021.7 1023.8 1025.0 1020.9 1025.0 DAY 10 16 12 21 29 7 6 31 21 29 4 1 MIN. QNH PRESSURE IN HPA 998.6 1003.4 1005.2 1006.6 1010.1 1008.3 1008.0 1009.0 1015.1 1013.6 1012.1 1009.4 998.6 DAY 30 10 30 18 4 27 18 1 6 7 26 21 MEAN QFF PRESSURE IN HPA 1020.7 1014.8 1011.7 1007.1 1004.7 998.1 993.7 997.6 1006.9 1012.0 1015.7 1015.0 1008.2 MAX. QFF PRESSURE IN HPA 1040.7 1030.1 1025.2 1012.4 1010.9 1008.9 997.4 1006.4 1010.5 1021.2 1023.8 1023.7 1040.7 DAY 10 16 12 20 14 7 15 31 2 29 18 10 MIN. QFF PRESSURE IN HPA 999.4 1004.2 1001.1 1000.2 999.1 991.1 986.3 988.9 1002.3 1005.8 1004.9 1007.0 986.3 DAY 2 10 30 27 4 27 18 1 6 6 25 3 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 BOROOJEN (99459) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 57 N LONGITUDE 51 18 E DATA PROCESSING CENTER ELEVATION 2197.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -0.8 0.8 4.5 11.1 16.0 22.4 24.4 23.9 20.8 12.7 8.3 6.2 12.5 MINIMUN AIR TEMPERATURE (C) -6.4 -5.0 -1.4 2.6 6.1 8.5 11.2 11.0 6.8 1.6 0.5 -3.1 2.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH MINIMUM TEMP. <=-4 23 14 8 0 0 0 0 0 0 0 7 14 66 DAYS WITH FREEZING MIN.<= 0 29 19 19 8 1 0 0 0 0 9 14 27 126 TEMPERATURE RECORDS LOWEST(C) -15.6 -20.6 -9.5 -3.2 -0.2 1.4 8.6 8.4 1.8 -3.6 -7.8 -10.0 -20.6 DAY 16 9 13 10 8 5 19 12 30 9 30 13 MAXIMUM AIR TEMPERATURE (C) 3.3 4.9 8.4 15.6 20.6 27.8 29.7 29.5 27.1 18.5 13.1 12.2 17.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 5 17 12 2 0 0 0 36 DAYS WITH MAXIMUM TEMP. <= 0 8 5 0 0 0 0 0 0 0 0 0 0 13 TEMPERATURE RECORDS HIGHEST(C) 9.2 12.0 15.4 21.6 26.6 31.6 32.6 32.2 30.2 23.4 17.2 16.2 32.6 DAY 28 27 31 19 26 30 15 15 3 1 1 20 DIF. BETWEEN (MAX.-MIN.) (C) 9.7 9.9 9.8 13.0 14.5 19.3 18.5 18.5 20.3 16.9 12.6 15.3 14.9 MEAN DAILY TEMP. (MDT) (C) -1.6 -0.0 3.5 9.1 13.3 18.1 20.5 20.3 17.0 10.1 6.8 4.6 10.1 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 0.1 7.5 7.9 0.0 0.0 0.0 0.0 15.5 HEATING DEG. DAYS(BASE 18 0C) 606.9 504.7 449.2 266.9 145.8 20.8 0.1 0.1 40.1 245.7 335.9 416.1 3032.3 DEWPOINT (MEAN C) -7.9 -6.7 -5.7 -3.4 0.4 -2.4 0.4 0.3 -4.3 -5.1 -4.3 -7.0 -3.8 MIXING RATIO (G/KG) 2.87 3.24 3.47 4.05 5.20 4.28 5.17 5.13 3.67 3.49 3.76 3.05 3.95 VAPOUR PRESSURE (HPA) 3.57 4.01 4.30 5.02 6.46 5.31 6.41 6.36 4.57 4.36 4.69 3.81 4.91 SATURATION DEF. (HPA) 2.48 2.96 4.48 8.75 12.74 23.40 25.57 24.83 21.71 11.27 6.83 6.22 12.60 RELATIVE HUMIDITY (MEAN %) 63 61 53 41 39 22 23 23 20 32 45 42 39 RELATIVE HUMIDITY (MAX. %) 77 79 75 64 67 48 42 41 37 50 66 61 59 RELATIVE HUMIDITY (MIN. %) 50 46 37 27 25 12 14 15 12 21 29 27 26 RELATIVE HUMIDITY (MEAN% 03UTC) 74 73 70 63 67 48 42 41 37 49 64 59 57 RELATIVE HUMIDITY (MEAN% 09UTC) 57 54 50 33 30 15 17 17 14 23 35 35 32 RELATIVE HUMIDITY (MEAN% 15UTC) 62 62 46 35 34 15 18 19 15 31 43 38 35 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 88.0 85.9 71.3 16.2 22.0 0.0 2.3 0.2 0.0 2.4 42.2 1.0 331.5 DAYS WITH PRECIPITATION >=10 3 2 2 0 1 0 0 0 0 0 2 0 10 DAYS WITH PRECIPITATION >= 5 5 3 7 1 1 0 0 0 0 0 3 0 20 DAYS WITH PRECIPITATION >= 1 8 7 10 4 4 0 1 0 0 1 5 0 40 DAYS WITH PRECIPITATION 12 9 14 5 7 0 2 1 0 2 7 2 61 GREATEST DAILY PRECIPITATION 37.0 55.0 15.0 8.0 14.0 0.0 2.0 0.2 0.0 2.0 17.0 0.6 55.0 DAY 8 3 9 27 6