STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 M MEANS AND EXTREMES FOR THE YEAR 1986 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. 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(MDT) (C) ***** ***** 8.1 17.7 21.8 27.8 30.7 28.4 23.9 19.8 10.2 4.4 ***** COOLING DEG. DAYS(BASE 21 0C)****** ****** 0.0 0.0 53.4 203.4 300.1 229.2 87.0 27.9 0.0 0.0 ****** HEATING DEG. DAYS(BASE 18 0C)****** ****** 288.7 29.1 8.9 0.0 0.0 0.0 0.0 19.4 233.6 409.3 ****** DEWPOINT (MEAN C) ***** ***** 1.2 5.8 7.1 8.3 5.4 5.3 4.0 3.5 1.2 -1.7 ***** MIXING RATIO (G/KG) ****** ****** 4.69 6.57 7.18 8.13 6.32 6.39 5.69 5.50 4.71 3.81 ****** VAPOUR PRESSURE (HPA) ****** ****** 6.85 9.55 10.40 11.68 9.14 9.26 8.30 8.04 6.90 5.59 ****** SATURATION DEF. (HPA) ****** ****** 5.43 11.68 17.96 29.52 39.75 32.84 24.69 16.86 6.09 2.66 ****** RELATIVE HUMIDITY (MEAN %) *** *** 63 50 43 31 21 25 29 37 59 71 *** RELATIVE HUMIDITY (MAX. %) *** *** 82 75 67 48 36 40 43 55 78 88 *** RELATIVE HUMIDITY (MIN. %) *** *** 46 29 24 20 12 15 18 21 38 47 *** RELATIVE HUMIDITY (MEAN% 03UTC) *** *** 76 70 63 47 36 39 42 54 73 84 *** RELATIVE HUMIDITY (MEAN% 09UTC) *** *** 53 34 30 25 15 18 21 25 44 53 *** RELATIVE HUMIDITY (MEAN% 15UTC) *** *** 54 39 33 23 12 16 21 27 53 68 *** RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. ****** ****** 73.6 19.3 43.3 0.0 0.1 0.0 0.0 0.0 40.5 28.3 ****** DAYS WITH PRECIPITATION >=10 **** **** 2 0 2 0 0 0 0 0 2 1 **** DAYS WITH PRECIPITATION >= 5 **** **** 2 2 3 0 0 0 0 0 3 1 **** DAYS WITH PRECIPITATION >= 1 **** **** 7 5 4 0 0 0 0 0 5 2 **** DAYS WITH PRECIPITATION **** **** 13 6 6 0 1 0 0 0 6 3 **** GREATEST DAILY PRECIPITATION ****** ****** 40.0 8.0 22.0 0.0 0.1 0.0 0.0 0.0 15.0 24.0 ****** DAY ** ** 8 11 4 ** 22 ** ** ** 29 20 DAY WITH THUNDER STORM **** **** 0 1 3 0 0 0 0 0 0 0 **** DAYS WITH SNOW OR SLEET **** **** 3 0 0 0 0 0 0 0 0 3 **** DAYS WITH DUST **** **** 0 1 0 0 0 1 0 0 0 0 **** WIND DIRECTION (PREVAILING) *** *** 90 270 270 90 90 90 90 270 270 270 *** PREVAILING WIND SPEED(KNOTS) **** **** 5.6 6.6 6.9 8.5 7.6 7.3 4.5 5.3 6.3 8.0 **** PREVAILING WIND PERCENT ***** ***** 17.6 20.8 32.7 22.9 46.8 38.7 16.3 20.6 14.2 15.3 ***** CALMS PERCENT OF WIND ***** ***** 55.3 44.6 33.5 32.9 35.5 41.1 59.6 54.4 69.6 75.0 ***** NO. OF WIND OBSERVATION **** **** 188 240 248 240 248 248 240 248 240 248 2388 VECTOR WIND DIRECTION (MEAN) *** *** 59 302 285 68 84 85 81 281 270 275 *** VECTOR WIND MAGNITUDE(KNOTS) **** **** 0.7 0.2 2.0 0.7 3.7 3.3 0.2 0.5 0.8 1.2 **** WIND STEADINESES (MEAN %) ***** ***** 28.0 5.7 47.6 16.3 84.1 80.5 11.1 21.7 47.1 66.7 ***** WIND SPEED (MEAN KNOTS) **** **** 2.5 3.5 4.2 4.3 4.4 4.1 1.8 2.3 1.7 1.8 **** FASTEST WIND DIRECTION *** *** 290 280 270 110 90 100 90 240 270 270 *** FASTEST WIND SPEED (KNOTS) *** *** 17 17 27 19 17 21 14 37 16 19 *** DAY ** ** 8 15 1 15 29 17 22 23 11 3 DAYS WITH SKY CLEAR (0-2)/8 **** **** 6 6 16 28 28 25 30 20 15 15 **** DAYS WITH P.CLOUDY (3-6)/8 **** **** 10 15 9 1 3 6 0 10 7 9 **** DAYS WITH CLOUDY (7-8)/8 **** **** 15 9 6 1 0 0 0 1 8 7 **** DAYS WITH VISIBILITY =< 2 KM **** **** 3 0 0 0 0 0 0 0 0 3 **** DURATION OF SUNSHINE HOURS ****** ****** 147.2 189.6 285.2 357.7 363.0 345.7 325.3 265.6 172.2 184.7 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 M MEANS AND EXTREMES FOR THE YEAR 1986 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA ****** ****** 916.2 913.8 912.6 906.9 908.9 911.0 915.2 917.7 918.2 919.3 ****** MAX. QFE PRESSURE IN HPA ****** ****** 923.9 922.5 920.4 916.4 914.3 915.9 921.7 926.2 926.4 931.4 ****** DAY-HOUR **-** **-** 28- 6 5- 6 18- 6 2- 6 15- 3 24-21 22- 6 15- 6 16- 6 7- 6 MIN. QFE PRESSURE IN HPA ****** ****** 908.1 908.2 906.3 900.7 901.1 905.5 910.2 910.5 909.1 907.8 ****** DAY-HOUR **-** **-** 8- 3 30-15 11-15 17-12 20-15 6-15 6-15 1-15 7-12 30-15 MEAN QNH PRESSURE IN HPA ****** ****** 1017.3 1014.7 1013.4 1007.2 1009.4 1011.6 1016.3 1019.0 1019.5 1020.7 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1025.7 1024.2 1021.9 1017.5 1015.3 1017.0 1023.3 1028.2 1028.4 1033.9 ****** DAY-HOUR **-** **-** 28- 6 5- 6 18- 6 2- 6 15- 3 24-21 22- 6 15- 6 16- 6 7- 6 MIN. 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QFF PRESSURE IN HPA ****** ****** ****** 1005.2 1001.2 992.6 992.9 999.0 1005.1 1006.0 1007.3 1009.5 ****** DAY ** ** ** 30 31 17 20 15 25 1 7 30 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 M MEANS AND EXTREMES FOR THE YEAR 1986 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 915.0 912.6 911.1 904.9 907.1 909.1 913.4 916.4 917.5 918.9 ****** MAX. QFE PRESSURE IN HPA ****** ****** 922.2 920.7 917.0 912.4 910.7 913.0 917.5 921.2 924.2 927.8 ****** DAY ** ** 16 5 18 2 3 31 22 14 15 6 MIN. 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QNH PRESSURE IN HPA ****** ****** ****** 1010.0 1008.4 1002.6 1003.0 1007.4 1012.5 1013.8 1010.0 1011.3 ****** DAY ** ** ** 10 30 16 20 4 5 1 7 27 MEAN QFF PRESSURE IN HPA ****** ****** ****** 1011.0 1008.3 999.8 1000.9 1004.3 1010.3 1015.0 1018.8 1022.8 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1020.9 1014.0 1008.7 1005.2 1010.3 1015.0 1020.9 1027.3 1036.0 ****** DAY ** ** ** 5 19 2 15 31 21 14 15 6 MIN. QFF PRESSURE IN HPA ****** ****** ****** 1006.7 1002.3 994.3 993.8 999.8 1006.4 1009.1 1007.7 1012.8 ****** DAY ** ** ** 29 30 28 20 4 3 1 7 2 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.7 8.0 11.1 18.0 25.1 30.6 31.0 30.8 25.2 14.8 11.6 6.2 18.2 MINIMUN AIR TEMPERATURE (C) -1.7 1.2 4.9 8.9 16.2 20.7 21.8 21.0 16.0 8.7 4.5 0.3 10.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 11 21 16 0 0 0 0 50 DAYS WITH MINIMUM TEMP. <=-4 8 6 0 0 0 0 0 0 0 0 0 4 18 DAYS WITH FREEZING MIN.<= 0 22 11 6 0 0 0 0 0 0 0 1 15 55 TEMPERATURE RECORDS LOWEST(C) -5.5 -5.2 -1.7 1.0 9.0 17.0 15.0 16.5 11.2 1.2 -2.4 -6.1 -6.1 DAY 13 12 23 6 8 1 29 24 25 13 30 3 MAXIMUM AIR TEMPERATURE (C) 14.2 15.7 17.3 26.7 33.3 38.7 39.2 39.3 34.1 21.2 19.8 13.7 26.1 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 11 25 30 30 31 27 4 0 0 158 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 23.4 23.2 24.0 34.0 37.0 42.0 44.2 42.2 41.0 34.2 26.0 20.5 44.2 DAY 31 25 9 15 16 29 20 4 6 1 7 11 DIF. BETWEEN (MAX.-MIN.) (C) 15.9 14.5 12.4 17.8 17.1 18.0 17.4 18.3 18.1 12.5 15.3 13.4 15.9 MEAN DAILY TEMP. (MDT) (C) 6.3 8.4 11.1 17.8 24.8 29.7 30.5 30.1 25.0 15.0 12.2 7.0 18.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 9.1 119.2 260.8 294.6 283.1 121.1 9.3 0.0 0.0 1097.5 HEATING DEG. DAYS(BASE 18 0C) 352.5 267.5 214.5 49.6 0.0 0.0 0.0 0.0 0.0 124.9 174.8 341.8 1525.5 DEWPOINT (MEAN C) -3.9 -1.2 0.9 2.3 5.3 1.1 6.5 4.9 3.1 2.6 0.1 -1.4 1.7 MIXING RATIO (G/KG) 3.19 4.02 4.86 5.14 6.42 4.75 6.94 6.25 5.45 5.46 4.34 3.90 5.06 VAPOUR PRESSURE (HPA) 4.69 5.88 7.06 7.47 9.31 6.89 10.02 9.03 7.92 7.99 6.37 5.72 7.36 SATURATION DEF. (HPA) 5.08 5.53 6.64 14.94 24.42 39.08 37.16 37.61 26.26 10.18 8.25 4.20 18.28 RELATIVE HUMIDITY (MEAN %) 54 57 55 40 33 17 25 22 27 51 50 61 41 RELATIVE HUMIDITY (MAX. %) 76 78 77 62 55 31 43 39 45 68 70 81 60 RELATIVE HUMIDITY (MIN. %) 28 35 34 22 17 9 13 11 14 35 27 38 24 RELATIVE HUMIDITY (MEAN% 03UTC) 73 74 73 58 50 29 39 38 45 62 68 76 57 RELATIVE HUMIDITY (MEAN% 09UTC) 36 41 41 26 21 12 17 16 18 41 32 44 29 RELATIVE HUMIDITY (MEAN% 15UTC) 45 46 45 29 21 10 15 12 18 47 41 54 32 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 0.7 13.2 33.5 3.4 5.6 0.0 5.0 0.1 3.8 32.0 2.9 15.0 115.2 DAYS WITH PRECIPITATION >=10 0 0 1 0 0 0 0 0 0 0 0 0 1 DAYS WITH PRECIPITATION >= 5 0 1 2 0 0 0 0 0 0 2 0 2 7 DAYS WITH PRECIPITATION >= 1 0 4 6 1 3 0 2 0 1 8 1 4 30 DAYS WITH PRECIPITATION 1 10 12 3 4 0 2 1 1 13 3 6 56 GREATEST DAILY PRECIPITATION 0.7 5.7 10.1 3.1 2.0 0.0 3.0 0.1 3.8 8.6 2.0 6.0 10.1 DAY 6 27 4 11 5 ** 28 5 21 26 29 24 DAY WITH THUNDER STORM 0 0 0 0 2 0 0 0 0 1 0 0 3 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 1 1 DAYS WITH DUST 2 0 0 1 1 2 0 0 2 0 0 0 8 WIND DIRECTION (PREVAILING) 270 270 270 270 270 90 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 7.8 6.4 7.0 7.3 8.4 9.0 8.2 7.5 7.0 6.8 6.4 6.9 7.3 PREVAILING WIND PERCENT 16.9 10.6 23.8 24.6 29.0 41.3 29.4 28.6 22.1 9.7 8.3 16.9 15.4 CALMS PERCENT OF WIND 67.7 70.6 50.4 47.1 39.5 31.3 37.9 46.4 55.0 69.8 80.8 70.6 55.5 NO. OF WIND OBSERVATION 248 218 248 240 248 240 248 248 240 248 240 248 2914 VECTOR WIND DIRECTION (MEAN) 274 271 268 264 278 85 68 82 69 314 289 269 313 VECTOR WIND MAGNITUDE(KNOTS) 1.3 0.4 1.8 2.6 1.9 3.2 1.9 2.0 0.9 0.5 0.3 1.3 0.2 WIND STEADINESES (MEAN %) 61.9 23.5 56.2 63.4 43.2 57.1 40.4 54.1 29.0 26.3 25.0 72.2 6.5 WIND SPEED (MEAN KNOTS) 2.1 1.7 3.2 4.1 4.4 5.6 4.7 3.7 3.1 1.9 1.2 1.8 3.1 FASTEST WIND DIRECTION 280 270 240 220 280 250 80 250 270 290 250 280 280 FASTEST WIND SPEED (KNOTS) 29 23 25 29 27 21 19 17 19 17 19 17 29 DAY 30 27 14 26 12 3 15 5 18 9 7 31 DAYS WITH SKY CLEAR (0-2)/8 19 10 7 12 11 27 29 26 28 10 17 14 210 DAYS WITH P.CLOUDY (3-6)/8 10 10 15 16 14 3 2 5 2 10 8 14 109 DAYS WITH CLOUDY (7-8)/8 2 7 9 2 6 0 0 0 0 11 5 3 45 DAYS WITH VISIBILITY =< 2 KM 1 0 0 0 0 0 0 0 0 1 0 0 2 DURATION OF SUNSHINE HOURS 236.0 177.5 199.9 268.2 259.7 347.8 357.8 345.3 298.2 170.1 202.3 188.8 3051.6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 919.4 917.5 911.7 913.9 913.2 909.3 908.6 908.5 913.0 919.6 920.0 918.8 914.5 MAX. QFE PRESSURE IN HPA 929.4 926.1 922.3 923.4 920.8 916.3 914.9 917.4 920.6 927.4 933.0 932.6 933.0 DAY-HOUR 12- 6 12- 6 23- 6 22- 6 1- 3 28- 6 11- 6 8- 6 24- 6 16- 6 30- 6 1- 6 MIN. QFE PRESSURE IN HPA 909.6 908.2 900.8 902.7 905.2 903.9 900.5 901.8 907.0 907.8 906.6 908.0 900.5 DAY-HOUR 6-12 10-15 13-21 4-15 22-15 9-15 3-15 25-15 6-12 4-15 7-12 24- 0 MEAN QNH PRESSURE IN HPA 1020.8 1018.7 1012.4 1014.8 1014.0 1009.8 1009.0 1009.0 1013.8 1021.0 1021.5 1020.2 1015.4 MAX. QNH PRESSURE IN HPA 1031.7 1028.1 1024.0 1025.2 1022.3 1017.4 1015.9 1018.6 1022.1 1029.5 1035.6 1035.2 1035.6 DAY-HOUR 12- 6 12- 6 23- 6 22- 6 1- 3 28- 6 11- 6 8- 6 24- 6 16- 6 30- 6 1- 6 MIN. QNH PRESSURE IN HPA 1010.1 1008.6 1000.6 1002.6 1005.4 1003.9 1000.2 1001.6 1007.3 1008.2 1006.9 1008.4 1000.2 DAY-HOUR 6-12 10-15 13-21 4-15 22-15 9-15 3-15 25-15 6-12 4-15 7-12 24- 0 MEAN QFF PRESSURE IN HPA 1022.4 1019.2 1011.6 1011.6 1008.3 1002.3 1001.3 1001.3 1008.0 1019.0 1020.7 1021.4 1012.3 MAX. QFF PRESSURE IN HPA 1034.8 1030.7 1024.8 1022.5 1018.2 1009.6 1010.5 1011.4 1017.8 1029.1 1039.3 1038.7 1039.3 DAY-HOUR 12- 6 12- 6 23- 6 22- 6 1- 3 28- 6 29- 3 8- 3 24- 6 28- 6 30- 6 1- 6 MIN. QFF PRESSURE IN HPA 1011.8 1009.2 999.2 1000.5 999.6 996.6 992.7 994.6 999.7 1003.7 1003.5 1007.9 992.7 DAY-HOUR 27- 0 10-15 14- 0 4-15 22-15 9-15 3-15 25-15 6-12 4-12 7-12 24- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 919.4 917.5 911.4 914.0 913.3 909.4 908.7 908.6 913.1 919.3 919.9 919.0 914.5 MAX. QFE PRESSURE IN HPA 927.5 924.3 919.3 919.4 918.1 913.4 913.0 915.3 918.4 925.7 931.5 931.3 931.5 DAY 12 7 23 22 1 28 11 8 26 29 30 1 MIN. QFE PRESSURE IN HPA 911.2 911.3 900.8 907.4 907.8 905.6 903.8 904.6 909.6 909.8 911.8 908.0 900.8 DAY 3 10 14 5 23 10 3 25 6 4 7 24 MEAN QNH PRESSURE IN HPA 1020.8 1018.8 1012.1 1014.9 1014.1 1010.0 1009.2 1009.1 1014.0 1020.7 1021.4 1020.3 1015.4 MAX. QNH PRESSURE IN HPA 1029.6 1026.1 1020.7 1020.8 1019.4 1014.3 1013.8 1016.3 1019.7 1027.7 1034.0 1033.8 1034.0 DAY 12 7 23 22 1 28 11 8 26 29 30 1 MIN. QNH PRESSURE IN HPA 1011.9 1012.0 1000.6 1007.7 1008.2 1005.8 1003.8 1004.7 1010.1 1010.4 1012.5 1008.4 1000.6 DAY 3 10 14 5 23 10 3 25 6 4 7 24 MEAN QFF PRESSURE IN HPA 1021.9 1019.1 1011.1 1011.7 1008.3 1002.5 1001.3 1001.3 1007.9 1018.4 1020.1 1021.1 1012.1 MAX. QFF PRESSURE IN HPA 1030.9 1027.8 1021.6 1018.4 1014.2 1008.0 1008.9 1008.6 1015.2 1027.8 1036.5 1036.4 1036.5 DAY 12 7 23 1 1 1 29 8 25 29 30 1 MIN. QFF PRESSURE IN HPA 1011.8 1011.4 999.2 1005.3 1001.9 998.2 995.2 997.3 1003.0 1005.5 1009.9 1007.9 995.2 DAY 27 5 14 19 23 18 21 26 6 4 7 24 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 919.9 918.2 912.2 915.1 914.4 911.1 910.3 910.2 914.3 920.1 920.6 919.2 915.5 MAX. QFE PRESSURE IN HPA 928.3 924.9 920.7 922.5 920.8 915.8 914.4 917.1 919.5 926.1 931.8 931.7 931.8 DAY 12 7 23 22 1 28 11 8 26 29 30 1 MIN. QFE PRESSURE IN HPA 912.0 910.8 902.4 908.2 909.2 907.4 904.5 906.0 910.7 911.1 911.2 909.6 902.4 DAY 3 10 14 4 23 10 3 25 6 4 7 24 MEAN QNH PRESSURE IN HPA 1021.4 1019.5 1013.0 1016.1 1015.3 1011.7 1010.9 1010.8 1015.3 1021.5 1022.1 1020.6 1016.5 MAX. QNH PRESSURE IN HPA 1030.5 1026.8 1022.2 1024.2 1022.3 1016.9 1015.4 1018.3 1020.9 1028.1 1034.3 1034.2 1034.3 DAY 12 7 23 22 1 28 11 8 26 29 30 1 MIN. QNH PRESSURE IN HPA 1012.8 1011.5 1002.3 1008.6 1009.7 1007.7 1004.6 1006.2 1011.3 1011.8 1011.9 1010.1 1002.3 DAY 3 10 14 4 23 10 3 25 6 4 7 24 MEAN QFF PRESSURE IN HPA 1023.5 1020.4 1012.6 1013.5 1009.9 1004.5 1003.3 1003.5 1010.0 1019.9 1022.0 1022.3 1013.8 MAX. QFF PRESSURE IN HPA 1033.3 1029.6 1023.8 1021.8 1018.2 1009.3 1010.5 1011.4 1016.9 1028.3 1038.0 1037.9 1038.0 DAY 12 7 23 22 1 28 29 8 25 29 30 1 MIN. QFF PRESSURE IN HPA 1014.7 1011.9 1001.0 1005.7 1003.1 999.8 996.8 999.1 1005.2 1007.7 1010.0 1010.0 996.8 DAY 27 10 14 19 23 18 3 25 6 4 7 24 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 921.2 919.4 913.4 915.8 914.8 911.6 910.8 910.9 915.2 921.2 921.6 920.6 916.4 MAX. QFE PRESSURE IN HPA 929.4 926.1 922.3 923.4 920.6 916.3 914.9 917.4 920.6 927.4 933.0 932.6 933.0 DAY 12 12 23 22 1 28 11 8 24 16 30 1 MIN. QFE PRESSURE IN HPA 914.3 911.4 903.8 908.5 910.0 908.4 904.5 907.0 911.2 912.2 911.5 912.5 903.8 DAY 3 10 14 19 23 10 3 25 6 4 7 24 MEAN QNH PRESSURE IN HPA 1022.8 1020.8 1014.3 1016.9 1015.8 1012.3 1011.4 1011.6 1016.3 1022.7 1023.2 1022.1 1017.5 MAX. QNH PRESSURE IN HPA 1031.7 1028.1 1024.0 1025.2 1022.1 1017.4 1015.9 1018.6 1022.1 1029.5 1035.6 1035.2 1035.6 DAY 12 12 23 22 1 28 11 8 24 16 30 1 MIN. QNH PRESSURE IN HPA 1015.3 1012.1 1003.8 1008.9 1010.6 1008.8 1004.6 1007.3 1011.9 1013.0 1012.2 1013.3 1003.8 DAY 3 10 14 19 23 10 3 25 6 4 7 24 MEAN QFF PRESSURE IN HPA 1024.8 1021.7 1013.6 1013.7 1009.9 1004.8 1003.6 1003.8 1010.5 1020.7 1022.6 1023.8 1014.5 MAX. QFF PRESSURE IN HPA 1034.8 1030.7 1024.8 1022.5 1017.5 1009.6 1010.0 1010.7 1017.8 1029.1 1039.3 1038.7 1039.3 DAY 12 12 23 22 1 28 29 8 24 28 30 1 MIN. QFF PRESSURE IN HPA 1017.2 1012.6 1003.3 1004.3 1003.5 1000.3 996.6 999.6 1004.7 1007.7 1009.9 1013.3 996.6 DAY 3 10 14 19 23 18 3 15 6 4 7 24 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 919.6 918.1 912.1 914.0 913.4 909.9 909.2 909.1 913.5 919.9 920.0 919.0 914.8 MAX. QFE PRESSURE IN HPA 928.0 925.3 920.2 921.5 918.3 914.0 913.3 915.8 918.8 925.9 932.4 931.0 932.4 DAY 12 12 23 22 1 28 11 8 24 28 30 1 MIN. QFE PRESSURE IN HPA 911.9 909.7 903.3 906.7 908.5 906.6 902.5 905.0 909.1 910.6 908.8 912.0 902.5 DAY 6 10 14 4 22 18 3 25 6 4 7 30 MEAN QNH PRESSURE IN HPA 1021.0 1019.4 1012.9 1015.0 1014.3 1010.5 1009.7 1009.6 1014.4 1021.3 1021.5 1020.4 1015.8 MAX. QNH PRESSURE IN HPA 1030.2 1027.2 1021.7 1023.1 1019.6 1014.9 1014.2 1016.9 1020.2 1027.9 1035.0 1033.4 1035.0 DAY 12 12 23 22 1 28 11 8 24 28 30 1 MIN. QNH PRESSURE IN HPA 1012.6 1010.2 1003.3 1007.0 1008.9 1006.9 1002.4 1005.1 1009.6 1011.2 1009.3 1012.8 1002.4 DAY 6 10 14 4 22 18 3 25 6 4 7 30 MEAN QFF PRESSURE IN HPA 1022.1 1019.6 1011.8 1011.5 1008.4 1002.9 1001.9 1001.7 1008.3 1019.1 1020.2 1021.3 1012.4 MAX. QFF PRESSURE IN HPA 1032.0 1029.6 1022.5 1020.6 1014.5 1006.8 1007.2 1009.3 1015.5 1028.1 1037.3 1036.1 1037.3 DAY 21 12 23 22 1 1 11 8 25 28 30 1 MIN. QFF PRESSURE IN HPA 1014.4 1010.6 1002.8 1004.0 1002.9 998.0 994.3 997.4 1001.8 1006.5 1006.0 1012.5 994.3 DAY 6 10 14 26 23 18 3 25 6 4 7 24 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 918.0 916.1 910.5 912.2 911.8 907.9 907.2 906.8 911.3 918.5 918.6 917.6 913.0 MAX. QFE PRESSURE IN HPA 926.3 923.1 918.3 918.9 916.7 911.9 911.6 913.2 916.7 925.9 931.1 928.9 931.1 DAY 12 12 23 22 12 28 28 8 25 28 30 1 MIN. QFE PRESSURE IN HPA 909.6 908.6 901.9 903.9 906.1 905.0 900.7 902.5 907.0 908.0 906.6 909.8 900.7 DAY 6 10 14 4 22 9 3 25 6 4 7 30 MEAN QNH PRESSURE IN HPA 1019.3 1017.2 1011.1 1013.0 1012.5 1008.3 1007.5 1007.1 1011.9 1019.8 1020.0 1018.8 1013.9 MAX. QNH PRESSURE IN HPA 1028.3 1024.8 1019.6 1020.3 1017.9 1012.6 1012.3 1014.1 1017.9 1027.9 1033.5 1031.2 1033.5 DAY 12 12 23 22 12 28 28 8 25 28 30 1 MIN. QNH PRESSURE IN HPA 1010.1 1009.1 1001.8 1003.9 1006.3 1005.1 1000.5 1002.4 1007.3 1008.4 1006.9 1010.4 1000.5 DAY 6 10 14 4 22 9 3 25 6 4 7 30 MEAN QFF PRESSURE IN HPA 1020.3 1017.3 1010.1 1009.7 1006.8 1000.8 999.7 999.4 1005.9 1017.6 1018.8 1019.6 1010.5 MAX. QFF PRESSURE IN HPA 1030.1 1027.2 1020.3 1017.9 1012.6 1005.3 1006.5 1006.5 1013.0 1028.1 1035.6 1033.7 1035.6 DAY 12 12 23 1 12 1 28 8 25 28 30 1 MIN. QFF PRESSURE IN HPA 1012.1 1009.4 1000.7 1001.1 1000.3 997.6 992.8 994.9 999.7 1003.7 1003.5 1011.1 992.8 DAY 6 10 14 4 22 9 3 25 6 4 7 13 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 918.5 916.2 910.5 912.2 911.5 907.2 906.4 906.4 911.1 918.8 919.2 918.2 913.0 MAX. QFE PRESSURE IN HPA 926.4 922.9 918.2 917.6 916.7 911.2 912.5 912.5 916.4 926.3 931.1 928.5 931.1 DAY 12 1 23 22 12 27 28 7 25 28 30 1 MIN. QFE PRESSURE IN HPA 910.2 908.2 902.6 902.7 905.2 903.9 900.5 901.8 907.0 907.8 908.4 910.8 900.5 DAY 2 10 19 4 22 9 3 25 6 4 7 23 MEAN QNH PRESSURE IN HPA 1019.9 1017.4 1011.1 1012.9 1012.2 1007.5 1006.7 1006.6 1011.7 1020.1 1020.6 1019.5 1013.9 MAX. QNH PRESSURE IN HPA 1028.4 1024.6 1019.5 1018.9 1017.9 1011.9 1013.3 1013.3 1017.5 1028.3 1033.5 1030.7 1033.5 DAY 12 1 23 22 12 27 28 7 25 28 30 1 MIN. QNH PRESSURE IN HPA 1010.8 1008.6 1002.5 1002.6 1005.4 1003.9 1000.2 1001.6 1007.3 1008.2 1008.8 1011.5 1000.2 DAY 2 10 19 4 22 9 3 25 6 4 7 23 MEAN QFF PRESSURE IN HPA 1021.9 1018.1 1010.7 1010.1 1006.8 1000.3 999.2 999.4 1006.5 1018.5 1020.4 1021.2 1011.1 MAX. QFF PRESSURE IN HPA 1031.2 1026.9 1020.9 1017.8 1012.6 1003.9 1007.2 1006.1 1013.4 1028.6 1036.9 1034.1 1036.9 DAY 12 12 22 1 12 27 28 7 25 28 30 1 MIN. QFF PRESSURE IN HPA 1012.9 1009.2 1002.0 1000.5 999.6 996.6 992.7 994.6 1000.8 1004.3 1006.2 1012.3 992.7 DAY 2 10 19 4 22 9 3 25 6 4 7 23 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 919.4 917.2 911.7 913.8 913.0 908.5 907.9 907.9 912.5 919.6 920.0 918.7 914.2 MAX. QFE PRESSURE IN HPA 926.8 923.5 919.3 918.7 917.5 912.2 912.9 914.7 917.8 926.6 931.5 930.1 931.5 DAY 12 6 23 22 12 27 28 7 25 28 30 1 MIN. QFE PRESSURE IN HPA 910.7 909.9 902.9 905.2 906.7 905.0 903.2 903.6 908.1 909.3 911.0 910.1 902.9 DAY 2 10 13 4 22 9 2 25 2 4 7 23 MEAN QNH PRESSURE IN HPA 1020.8 1018.4 1012.4 1014.7 1013.9 1009.0 1008.3 1008.3 1013.3 1021.0 1021.5 1020.1 1015.1 MAX. QNH PRESSURE IN HPA 1028.9 1025.3 1020.7 1020.1 1018.7 1013.0 1013.7 1015.7 1019.1 1028.6 1034.0 1032.5 1034.0 DAY 12 6 23 22 12 27 28 7 25 28 30 1 MIN. QNH PRESSURE IN HPA 1011.3 1010.5 1002.8 1005.4 1007.0 1005.1 1003.2 1003.6 1008.5 1009.8 1011.7 1010.7 1002.8 DAY 2 10 13 4 22 9 2 25 2 4 7 23 MEAN QFF PRESSURE IN HPA 1022.7 1019.2 1011.7 1011.3 1007.9 1001.4 1000.5 1000.5 1007.6 1019.0 1020.9 1021.7 1012.0 MAX. QFF PRESSURE IN HPA 1032.2 1027.0 1021.2 1019.3 1013.3 1005.1 1007.9 1007.8 1014.6 1028.8 1037.3 1035.9 1037.3 DAY 12 12 22 1 19 28 28 7 24 28 30 1 MIN. QFF PRESSURE IN HPA 1013.5 1011.5 1002.6 1001.0 1000.7 997.8 995.1 995.9 1001.7 1004.7 1008.6 1011.3 995.1 DAY 6 10 13 19 22 9 2 25 2 3 7 23 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 919.5 917.2 911.8 914.1 913.3 908.9 908.3 908.4 912.9 919.5 920.2 918.6 914.4 MAX. QFE PRESSURE IN HPA 926.5 924.2 919.3 919.2 917.5 912.3 912.9 915.5 918.1 926.7 931.5 930.4 931.5 DAY 11 6 22 21 12 27 28 7 25 28 29 1 MIN. QFE PRESSURE IN HPA 910.4 911.2 900.8 906.5 907.0 905.6 904.2 904.1 909.6 909.8 912.5 908.9 900.8 DAY 6 10 13 4 22 9 3 25 1 3 7 23 MEAN QNH PRESSURE IN HPA 1020.9 1018.4 1012.5 1015.1 1014.1 1009.4 1008.8 1008.8 1013.8 1021.0 1021.7 1019.9 1015.4 MAX. QNH PRESSURE IN HPA 1028.5 1026.0 1020.7 1020.6 1018.7 1013.1 1013.7 1016.6 1019.4 1028.8 1034.0 1032.8 1034.0 DAY 11 6 22 21 12 27 28 7 25 28 29 1 MIN. QNH PRESSURE IN HPA 1011.0 1011.9 1000.6 1006.8 1007.3 1005.8 1004.3 1004.2 1010.1 1010.4 1013.3 1009.4 1000.6 DAY 6 10 13 4 22 9 3 25 1 3 7 23 MEAN QFF PRESSURE IN HPA 1022.0 1018.8 1011.5 1011.5 1008.2 1001.7 1000.9 1000.9 1007.7 1018.8 1020.5 1020.8 1011.9 MAX. QFF PRESSURE IN HPA 1030.0 1027.9 1021.7 1018.6 1012.9 1004.9 1008.4 1009.0 1015.1 1028.9 1036.7 1035.5 1036.7 DAY 20 6 22 1 19 1 28 7 24 28 30 1 MIN. QFF PRESSURE IN HPA 1011.8 1011.6 999.8 1003.8 1001.1 997.7 995.2 996.2 1003.1 1005.4 1009.6 1008.9 995.2 DAY 6 4 13 19 22 17 20 25 6 3 7 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.5 6.4 12.1 17.2 25.0 29.8 32.1 30.9 25.4 18.2 11.3 6.1 18.3 MINIMUN AIR TEMPERATURE (C) -1.0 0.8 4.8 10.1 15.7 20.0 22.9 22.1 15.1 9.1 3.3 -0.8 10.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 11 25 22 1 0 0 0 60 DAYS WITH MINIMUM TEMP. <=-4 6 2 0 0 0 0 0 0 0 0 5 6 19 DAYS WITH FREEZING MIN.<= 0 22 11 1 0 0 0 0 0 0 0 11 22 67 TEMPERATURE RECORDS LOWEST(C) -7.0 -7.0 0.0 0.4 10.0 16.0 18.0 17.0 10.0 6.0 -5.0 -8.6 -8.6 DAY 4 7 6 4 6 1 28 27 28 23 16 31 MAXIMUM AIR TEMPERATURE (C) 10.5 12.9 19.6 24.9 33.3 37.8 40.3 38.7 34.8 27.5 20.0 14.1 26.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 6 25 30 31 31 28 5 0 0 156 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 16.0 20.0 26.0 33.0 39.0 42.2 44.0 43.0 40.0 32.0 27.0 22.0 44.0 DAY 31 29 20 18 28 14 13 12 11 6 2 11 DIF. BETWEEN (MAX.-MIN.) (C) 11.5 12.1 14.8 14.8 17.6 17.8 17.4 16.6 19.7 18.4 16.7 14.9 16.0 MEAN DAILY TEMP. (MDT) (C) 4.8 6.9 12.2 17.5 24.5 28.9 31.6 30.4 25.0 18.3 11.7 6.6 18.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 7.8 113.8 237.6 329.3 291.5 122.4 0.0 0.0 0.0 1102.5 HEATING DEG. DAYS(BASE 18 0C) 410.4 322.8 179.5 65.2 0.0 0.0 0.0 0.0 0.0 14.1 191.0 352.3 1535.2 DEWPOINT (MEAN C) -2.9 -2.3 -1.9 3.6 1.0 1.3 7.3 6.4 1.5 1.2 -4.1 -4.6 0.5 MIXING RATIO (G/KG) 3.48 3.67 3.87 6.03 4.71 4.79 7.50 6.96 4.91 4.79 3.47 3.12 4.78 VAPOUR PRESSURE (HPA) 5.11 5.37 5.63 8.75 6.85 6.93 10.78 10.03 7.14 7.00 5.08 4.57 6.94 SATURATION DEF. (HPA) 3.65 4.80 9.27 12.34 26.73 36.98 39.52 36.66 27.83 15.34 9.80 5.59 19.04 RELATIVE HUMIDITY (MEAN %) 62 58 43 46 25 18 25 24 24 37 38 51 38 RELATIVE HUMIDITY (MAX. %) 81 77 65 72 44 32 44 41 39 55 58 69 56 RELATIVE HUMIDITY (MIN. %) 40 35 23 23 12 9 13 14 13 20 19 31 21 RELATIVE HUMIDITY (MEAN% 03UTC) 79 70 63 67 39 30 42 41 38 55 54 64 54 RELATIVE HUMIDITY (MEAN% 09UTC) 47 45 31 29 14 12 17 18 15 25 23 36 26 RELATIVE HUMIDITY (MEAN% 15UTC) 52 48 31 35 14 10 14 14 16 28 29 44 28 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 9.2 14.3 9.6 26.7 0.2 0.0 6.0 0.0 0.0 2.8 2.0 8.6 79.4 DAYS WITH PRECIPITATION >=10 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH PRECIPITATION >= 5 0 0 1 1 0 0 0 0 0 0 0 1 3 DAYS WITH PRECIPITATION >= 1 2 4 3 5 0 0 2 0 0 1 1 3 21 DAYS WITH PRECIPITATION 8 9 5 9 2 0 2 0 0 1 3 4 43 GREATEST DAILY PRECIPITATION 4.4 4.0 5.0 9.6 0.1 0.0 4.0 0.0 0.0 2.8 1.0 6.1 9.6 DAY 18 24 4 13 2 ** 11 ** ** 16 14 17 DAY WITH THUNDER STORM 0 0 0 2 1 1 1 0 0 0 0 0 5 DAYS WITH SNOW OR SLEET 1 2 0 0 0 0 0 0 0 0 0 2 5 DAYS WITH DUST 1 0 5 2 0 0 3 1 0 0 1 0 13 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 90 90 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.2 6.1 9.1 7.3 8.4 8.0 10.5 8.8 7.6 6.0 7.8 7.5 7.7 PREVAILING WIND PERCENT 25.8 29.3 29.4 19.2 36.3 21.7 31.9 35.5 17.5 13.7 12.9 20.2 18.9 CALMS PERCENT OF WIND 61.7 53.9 45.6 47.1 35.1 31.3 42.3 44.4 60.4 67.7 72.1 71.4 52.7 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 276 279 279 297 282 318 81 82 66 4 260 270 302 VECTOR WIND MAGNITUDE(KNOTS) 2.0 1.8 2.7 2.4 2.7 1.2 3.4 2.8 0.5 0.3 0.7 1.5 0.7 WIND STEADINESES (MEAN %) 69.0 64.3 60.0 57.1 49.1 21.4 66.7 59.6 18.5 15.0 35.0 75.0 18.9 WIND SPEED (MEAN KNOTS) 2.9 2.8 4.5 4.2 5.5 5.6 5.1 4.7 2.7 2.0 2.0 2.0 3.7 FASTEST WIND DIRECTION 290 280 290 280 240 240 110 300 290 290 270 240 110 FASTEST WIND SPEED (KNOTS) 23 21 29 23 29 19 31 21 16 23 23 19 31 DAY 19 28 31 1 1 1 6 5 13 15 14 12 DAYS WITH SKY CLEAR (0-2)/8 6 10 17 7 26 28 28 30 28 24 17 16 237 DAYS WITH P.CLOUDY (3-6)/8 17 11 9 15 5 2 3 1 2 6 8 9 88 DAYS WITH CLOUDY (7-8)/8 8 8 5 8 0 0 0 0 0 1 5 6 41 DAYS WITH VISIBILITY =< 2 KM 0 2 0 0 0 0 0 0 0 1 1 0 4 DURATION OF SUNSHINE HOURS 171.0 185.4 243.6 220.4 348.7 359.8 366.1 347.8 313.4 273.6 198.5 200.1 3228.4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 917.7 916.3 911.7 913.6 911.3 907.5 905.3 907.0 912.1 917.1 917.9 916.8 912.9 MAX. QFE PRESSURE IN HPA 929.4 929.1 923.0 925.8 919.7 914.4 912.9 914.3 919.6 925.4 925.3 926.4 929.4 DAY-HOUR 3- 6 7- 6 17- 6 9- 6 17- 6 8- 6 31- 6 21- 6 14- 6 16- 6 6- 6 30- 6 MIN. QFE PRESSURE IN HPA 907.9 903.8 902.6 904.2 905.2 899.5 899.4 900.7 904.4 908.6 910.1 900.8 899.4 DAY-HOUR 29- 3 2-12 4-21 23-12 24-15 30-15 18-15 29-15 11-15 30-12 28-12 27- 3 MEAN QNH PRESSURE IN HPA 1019.0 1017.4 1012.4 1014.5 1012.0 1007.9 1005.4 1007.3 1012.8 1018.3 1019.2 1018.0 1013.7 MAX. QNH PRESSURE IN HPA 1031.7 1031.4 1024.7 1027.8 1021.1 1015.4 1013.7 1015.3 1021.0 1027.3 1027.2 1028.4 1031.7 DAY-HOUR 3- 6 7- 6 17- 6 9- 6 17- 6 8- 6 31- 6 21- 6 14- 6 16- 6 6- 6 30- 6 MIN. QNH PRESSURE IN HPA 1008.3 1003.8 1002.5 1004.3 1005.4 999.1 999.0 1000.5 1004.5 1009.1 1010.7 1000.6 999.0 DAY-HOUR 29- 3 2-12 4-21 23-12 24-15 30-15 18-15 29-15 11-15 30-12 28-12 27- 3 MEAN QFF PRESSURE IN HPA 1020.9 1018.6 1011.3 1011.5 1006.4 1000.6 997.2 999.5 1007.0 1015.1 1018.5 1019.3 1010.5 MAX. QFF PRESSURE IN HPA 1035.5 1035.5 1024.6 1027.4 1016.1 1008.3 1005.6 1007.7 1016.4 1025.9 1028.9 1033.5 1035.5 DAY-HOUR 3- 6 7- 6 17- 6 9- 6 5- 6 8- 6 31- 3 21- 6 30- 6 16- 6 16- 6 30- 6 MIN. QFF PRESSURE IN HPA 1008.3 1002.2 1000.5 999.2 999.1 991.6 990.6 992.4 998.6 1006.0 1007.8 1003.5 990.6 DAY-HOUR 29- 0 2-12 21- 0 23-12 24-15 16-15 18-15 2-15 12-12 30-12 10-12 27- 3 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 917.6 916.2 911.5 913.5 911.4 908.1 905.6 907.2 911.9 917.0 917.9 916.8 912.9 MAX. QFE PRESSURE IN HPA 927.1 927.1 920.7 923.5 917.4 912.7 910.4 911.5 917.2 923.6 923.4 925.3 927.1 DAY 3 7 17 9 17 8 31 22 14 17 16 30 MIN. QFE PRESSURE IN HPA 908.1 906.8 902.6 906.5 906.2 902.6 901.6 903.1 906.3 910.1 910.9 903.5 901.6 DAY 29 2 5 25 28 24 17 30 12 31 20 27 MEAN QNH PRESSURE IN HPA 1018.9 1017.4 1012.2 1014.4 1012.2 1008.5 1005.7 1007.5 1012.6 1018.3 1019.2 1018.0 1013.7 MAX. QNH PRESSURE IN HPA 1029.2 1029.2 1022.2 1025.3 1018.6 1013.5 1011.0 1012.2 1018.4 1025.4 1025.2 1027.2 1029.2 DAY 3 7 17 9 17 8 31 22 14 17 16 30 MIN. QNH PRESSURE IN HPA 1008.5 1007.1 1002.5 1006.8 1006.4 1002.5 1001.4 1003.1 1006.6 1010.7 1011.6 1003.5 1001.4 DAY 29 2 5 25 28 24 17 30 12 31 20 27 MEAN QFF PRESSURE IN HPA 1020.6 1018.2 1010.9 1011.2 1006.6 1001.4 997.5 999.5 1006.6 1014.7 1018.1 1018.9 1010.3 MAX. QFF PRESSURE IN HPA 1032.1 1032.4 1021.5 1024.1 1013.1 1006.7 1003.6 1005.1 1013.7 1023.6 1027.0 1031.3 1032.4 DAY 3 7 17 9 6 1 27 26 26 17 16 30 MIN. QFF PRESSURE IN HPA 1008.3 1005.4 1000.5 1000.9 1000.0 995.0 992.6 994.2 999.7 1006.9 1010.1 1005.7 992.6 DAY 29 2 21 25 28 30 17 30 12 31 11 27 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 917.9 916.8 912.5 914.5 912.7 909.3 907.2 908.9 913.4 917.9 918.5 917.2 913.9 MAX. QFE PRESSURE IN HPA 927.5 927.7 921.7 924.3 919.1 913.9 912.6 913.2 918.6 923.6 924.2 925.4 927.7 DAY 3 7 17 9 17 8 31 21 14 17 6 30 MIN. QFE PRESSURE IN HPA 907.9 906.2 904.0 906.5 907.4 903.4 902.8 904.1 907.8 911.5 911.7 900.8 900.8 DAY 29 2 5 25 1 30 8 30 12 31 20 27 MEAN QNH PRESSURE IN HPA 1019.1 1017.9 1013.3 1015.4 1013.5 1009.9 1007.5 1009.4 1014.3 1019.2 1019.8 1018.5 1014.8 MAX. QNH PRESSURE IN HPA 1029.6 1029.8 1023.3 1026.1 1020.5 1014.8 1013.4 1014.1 1019.9 1025.4 1026.0 1027.3 1029.8 DAY 3 7 17 9 17 8 31 21 14 17 6 30 MIN. QNH PRESSURE IN HPA 1008.3 1006.4 1004.0 1006.8 1007.7 1003.4 1002.7 1004.2 1008.2 1012.2 1012.4 1000.6 1000.6 DAY 29 2 5 25 1 30 8 30 12 31 20 27 MEAN QFF PRESSURE IN HPA 1021.5 1019.4 1012.6 1012.8 1008.2 1002.7 999.5 1001.8 1008.9 1016.6 1019.7 1020.2 1012.0 MAX. QFF PRESSURE IN HPA 1033.6 1034.4 1023.5 1026.2 1015.0 1007.5 1005.6 1007.1 1015.7 1024.3 1028.1 1033.1 1034.4 DAY 3 7 17 9 17 8 31 26 25 17 16 30 MIN. QFF PRESSURE IN HPA 1008.9 1005.8 1002.3 1001.2 1001.4 995.9 994.3 996.3 1002.3 1009.4 1011.7 1003.5 994.3 DAY 29 2 21 25 28 30 18 30 12 7 11 27 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 919.1 917.9 913.6 915.5 913.3 909.7 907.6 909.6 914.5 919.2 919.8 918.3 914.8 MAX. QFE PRESSURE IN HPA 929.4 929.1 923.0 925.8 919.7 914.4 912.9 914.3 919.6 925.4 925.3 926.4 929.4 DAY 3 7 17 9 17 8 31 21 14 16 6 30 MIN. QFE PRESSURE IN HPA 911.2 906.7 905.9 908.0 908.6 904.0 903.4 904.9 909.5 913.4 912.4 901.3 901.3 DAY 29 2 21 25 28 30 8 30 12 30 20 27 MEAN QNH PRESSURE IN HPA 1020.5 1019.2 1014.5 1016.6 1014.2 1010.3 1007.9 1010.1 1015.4 1020.6 1021.2 1019.7 1015.8 MAX. QNH PRESSURE IN HPA 1031.7 1031.4 1024.7 1027.8 1021.1 1015.4 1013.7 1015.3 1021.0 1027.3 1027.2 1028.4 1031.7 DAY 3 7 17 9 17 8 31 21 14 16 6 30 MIN. QNH PRESSURE IN HPA 1011.9 1007.0 1006.1 1008.4 1009.1 1004.0 1003.4 1005.0 1010.0 1014.3 1013.2 1001.1 1001.1 DAY 29 2 21 25 28 30 8 30 12 30 20 27 MEAN QFF PRESSURE IN HPA 1022.8 1020.6 1013.3 1013.7 1008.5 1002.9 999.7 1002.3 1009.6 1017.5 1020.8 1021.4 1012.7 MAX. QFF PRESSURE IN HPA 1035.5 1035.5 1024.6 1027.4 1016.1 1008.3 1005.1 1007.7 1016.4 1025.9 1028.9 1033.5 1035.5 DAY 3 7 17 9 5 8 30 21 30 16 16 30 MIN. QFF PRESSURE IN HPA 1012.9 1006.3 1002.0 1003.1 1002.0 996.4 995.2 996.5 1003.7 1010.1 1012.4 1004.3 995.2 DAY 29 2 21 25 28 30 18 30 4 7 11 27 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.0 916.7 912.1 914.1 911.7 908.0 905.9 907.8 912.7 917.5 917.8 916.8 913.3 MAX. QFE PRESSURE IN HPA 927.9 926.4 921.7 924.8 917.5 913.8 911.7 913.7 918.2 924.8 923.4 924.4 927.9 DAY 3 7 17 9 17 8 31 21 25 16 6 29 MIN. QFE PRESSURE IN HPA 910.9 904.9 905.2 906.7 907.0 901.7 902.2 903.6 908.1 911.1 911.2 902.1 901.7 DAY 29 2 21 23 28 30 18 30 12 30 28 27 MEAN QNH PRESSURE IN HPA 1019.2 1017.9 1012.9 1015.1 1012.4 1008.4 1006.1 1008.2 1013.5 1018.7 1019.1 1018.0 1014.1 MAX. QNH PRESSURE IN HPA 1030.1 1028.4 1023.3 1026.7 1018.7 1014.7 1012.4 1014.6 1019.5 1026.7 1025.2 1026.3 1030.1 DAY 3 7 17 9 17 8 31 21 25 16 6 29 MIN. QNH PRESSURE IN HPA 1011.6 1005.0 1005.4 1007.0 1007.3 1001.5 1002.1 1003.6 1008.5 1011.8 1011.9 1002.0 1001.5 DAY 29 2 21 23 28 30 18 30 12 30 28 27 MEAN QFF PRESSURE IN HPA 1020.8 1018.8 1011.6 1011.9 1006.6 1001.1 997.8 1000.2 1007.6 1015.0 1017.9 1018.8 1010.7 MAX. QFF PRESSURE IN HPA 1033.5 1031.8 1022.4 1025.9 1014.3 1007.4 1003.7 1006.7 1014.8 1025.0 1025.4 1030.1 1033.5 DAY 3 7 17 9 5 8 31 21 25 16 15 29 MIN. QFF PRESSURE IN HPA 1011.2 1003.7 1001.4 1001.3 1000.3 993.7 993.4 995.1 1001.7 1008.2 1010.4 1003.9 993.4 DAY 28 2 21 23 28 30 18 30 12 21 11 27 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 916.6 914.9 910.1 912.2 909.7 905.8 903.7 905.5 910.5 915.6 916.3 915.4 911.4 MAX. QFE PRESSURE IN HPA 926.2 924.6 918.5 921.9 915.2 911.7 909.5 911.2 916.2 923.8 922.0 923.7 926.2 DAY 3 6 17 9 17 8 31 21 25 16 15 29 MIN. QFE PRESSURE IN HPA 909.5 903.8 904.2 904.2 905.9 900.2 900.0 901.3 905.2 908.6 910.1 903.0 900.0 DAY 28 2 4 23 28 30 17 29 11 30 28 26 MEAN QNH PRESSURE IN HPA 1017.7 1016.0 1010.7 1013.0 1010.3 1006.0 1003.7 1005.7 1011.1 1016.7 1017.5 1016.5 1012.1 MAX. QNH PRESSURE IN HPA 1028.2 1026.5 1019.8 1023.5 1016.2 1012.4 1010.0 1011.9 1017.3 1025.6 1023.6 1025.5 1028.2 DAY 3 6 17 9 17 8 31 21 25 16 15 29 MIN. QNH PRESSURE IN HPA 1010.0 1003.8 1004.3 1004.3 1006.1 999.9 999.7 1001.1 1005.4 1009.1 1010.7 1003.0 999.7 DAY 28 2 4 23 28 30 17 29 11 30 28 26 MEAN QFF PRESSURE IN HPA 1019.3 1016.7 1009.4 1009.9 1004.7 998.9 995.5 997.8 1005.1 1013.1 1016.4 1017.3 1008.7 MAX. QFF PRESSURE IN HPA 1031.8 1029.6 1019.2 1022.5 1011.9 1005.2 1002.0 1004.0 1012.0 1023.8 1024.4 1029.1 1031.8 DAY 3 7 17 9 5 8 31 21 25 16 15 29 MIN. QFF PRESSURE IN HPA 1009.9 1002.2 1003.1 999.2 999.7 992.6 991.1 993.0 998.6 1006.0 1007.8 1004.7 991.1 DAY 28 2 4 23 28 30 18 29 12 30 10 26 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 917.1 915.4 910.3 912.2 909.4 905.2 902.9 904.7 910.1 915.7 916.9 916.3 911.3 MAX. QFE PRESSURE IN HPA 927.5 925.7 917.9 921.3 914.4 910.9 909.0 910.0 915.8 924.0 922.6 925.0 927.5 DAY 3 6 17 9 17 8 31 21 25 16 15 29 MIN. QFE PRESSURE IN HPA 910.0 905.4 903.1 905.4 905.2 899.5 899.4 900.7 904.4 909.1 910.5 903.7 899.4 DAY 26 2 4 30 24 30 18 29 11 30 10 26 MEAN QNH PRESSURE IN HPA 1018.3 1016.5 1010.9 1013.0 1009.9 1005.3 1002.8 1004.8 1010.7 1016.8 1018.1 1017.4 1012.0 MAX. QNH PRESSURE IN HPA 1029.6 1027.7 1019.2 1022.9 1015.4 1011.6 1009.5 1010.6 1016.9 1025.8 1024.3 1026.9 1029.6 DAY 3 6 17 9 17 8 31 21 25 16 15 29 MIN. QNH PRESSURE IN HPA 1010.6 1005.6 1003.1 1005.6 1005.4 999.1 999.0 1000.5 1004.5 1009.6 1011.1 1003.7 999.0 DAY 26 2 4 30 24 30 18 29 11 30 10 26 MEAN QFF PRESSURE IN HPA 1020.6 1017.9 1010.2 1010.4 1004.5 998.2 994.9 997.4 1005.3 1014.2 1018.1 1019.1 1009.2 MAX. QFF PRESSURE IN HPA 1034.0 1031.1 1019.4 1022.8 1011.3 1004.5 1001.7 1003.1 1013.0 1024.2 1026.4 1032.0 1034.0 DAY 3 6 17 9 5 7 31 21 25 16 15 29 MIN. QFF PRESSURE IN HPA 1011.8 1005.0 1002.3 1001.3 999.1 991.6 990.6 992.4 998.7 1007.6 1009.1 1006.1 990.6 DAY 26 2 4 24 24 16 18 2 11 20 10 26 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 917.9 916.3 911.7 913.7 911.0 906.7 904.3 905.9 911.7 916.9 918.0 917.0 912.6 MAX. QFE PRESSURE IN HPA 927.0 927.5 918.5 923.1 915.3 912.2 909.3 911.2 916.8 924.6 923.6 925.8 927.5 DAY 3 6 16 8 5 8 31 21 14 16 15 29 MIN. QFE PRESSURE IN HPA 910.5 906.2 903.2 906.1 906.6 900.2 899.6 901.9 905.6 909.3 912.7 903.7 899.6 DAY 28 1 4 30 24 29 16 29 11 30 10 26 MEAN QNH PRESSURE IN HPA 1019.2 1017.4 1012.4 1014.6 1011.6 1007.0 1004.4 1006.2 1012.4 1018.1 1019.3 1018.2 1013.4 MAX. QNH PRESSURE IN HPA 1029.1 1029.6 1019.8 1024.8 1016.3 1013.0 1009.8 1011.9 1018.0 1026.5 1025.4 1027.8 1029.6 DAY 3 6 16 8 5 8 31 21 14 16 15 29 MIN. QNH PRESSURE IN HPA 1011.1 1006.4 1003.2 1006.3 1006.9 999.9 999.3 1001.8 1005.8 1009.8 1013.5 1003.7 999.3 DAY 28 1 4 30 24 29 16 29 11 30 10 26 MEAN QFF PRESSURE IN HPA 1021.4 1018.8 1011.3 1011.6 1005.9 999.6 996.1 998.4 1006.5 1014.9 1018.9 1019.9 1010.3 MAX. QFF PRESSURE IN HPA 1032.9 1033.0 1019.4 1024.0 1012.6 1006.2 1003.0 1004.3 1013.9 1025.0 1027.5 1032.5 1033.0 DAY 3 6 16 8 5 8 27 21 30 16 15 29 MIN. QFF PRESSURE IN HPA 1011.6 1006.3 1002.0 1002.1 1000.1 992.1 990.6 993.5 1000.0 1006.9 1009.6 1006.6 990.6 DAY 28 2 4 30 24 29 16 29 11 30 10 26 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 917.8 916.3 911.7 913.6 911.4 907.4 905.2 906.7 912.0 917.1 918.0 917.1 912.9 MAX. QFE PRESSURE IN HPA 927.1 927.9 919.9 923.1 916.1 911.8 909.2 911.1 917.4 924.6 923.8 925.3 927.9 DAY 2 6 16 8 16 8 26 21 30 16 15 29 MIN. QFE PRESSURE IN HPA 909.0 907.2 902.6 906.3 906.6 902.2 901.2 902.6 906.3 909.7 912.0 903.8 901.2 DAY 28 1 4 30 27 29 16 29 11 30 19 26 MEAN QNH PRESSURE IN HPA 1019.1 1017.5 1012.5 1014.5 1012.1 1007.7 1005.4 1007.0 1012.7 1018.3 1019.3 1018.3 1013.7 MAX. QNH PRESSURE IN HPA 1029.2 1030.1 1021.4 1024.8 1017.2 1012.5 1009.7 1011.8 1018.6 1026.5 1025.6 1027.2 1030.1 DAY 2 6 16 8 16 8 26 21 30 16 15 29 MIN. QNH PRESSURE IN HPA 1009.5 1007.5 1002.5 1006.6 1006.9 1002.1 1001.0 1002.5 1006.6 1010.2 1012.8 1003.8 1001.0 DAY 28 1 4 30 27 29 16 29 11 30 19 26 MEAN QFF PRESSURE IN HPA 1020.6 1018.3 1011.1 1011.2 1006.2 1000.3 997.1 999.1 1006.8 1014.6 1018.2 1019.1 1010.2 MAX. QFF PRESSURE IN HPA 1032.2 1033.2 1020.3 1023.9 1012.9 1005.4 1003.4 1004.1 1014.4 1025.0 1026.3 1031.0 1033.2 DAY 3 6 16 8 5 8 27 25 30 16 15 29 MIN. QFF PRESSURE IN HPA 1008.8 1006.5 1001.1 1001.3 1000.1 994.1 992.3 993.9 999.8 1006.4 1009.8 1006.2 992.3 DAY 28 29 4 24 27 29 17 29 11 30 10 26 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 0.8 1.2 11.7 19.6 24.0 30.7 33.1 31.3 25.2 19.6 12.0 7.1 18.0 MINIMUN AIR TEMPERATURE (C) -4.7 -4.0 5.1 9.7 14.2 19.5 23.5 21.0 14.7 9.9 4.2 1.6 9.6 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 10 24 15 0 0 0 0 50 DAYS WITH MINIMUM TEMP. <=-4 16 15 0 0 0 0 0 0 0 0 0 0 31 DAYS WITH FREEZING MIN.<= 0 29 24 1 0 0 0 0 0 0 0 3 13 70 TEMPERATURE RECORDS LOWEST(C) -11.0 -11.0 -1.0 3.0 6.0 15.6 17.2 14.0 7.5 5.0 -1.6 -2.6 -11.0 DAY 31 1 31 1 2 2 31 31 24 24 23 8 MAXIMUM AIR TEMPERATURE (C) 7.3 7.5 18.4 27.8 32.3 39.3 41.1 39.8 34.7 29.0 20.0 14.0 25.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 9 22 30 31 31 24 13 0 0 160 DAYS WITH MAXIMUM TEMP. <= 0 1 0 0 0 0 0 0 0 0 0 0 0 1 TEMPERATURE RECORDS HIGHEST(C) 12.0 19.0 24.4 33.6 40.0 44.2 45.6 42.4 41.0 35.2 25.0 20.0 45.6 DAY 1 28 25 15 26 30 13 5 2 8 28 1 DIF. BETWEEN (MAX.-MIN.) (C) 12.0 11.5 13.3 18.1 18.1 19.8 17.6 18.8 20.0 19.1 15.8 12.4 16.3 MEAN DAILY TEMP. (MDT) (C) 1.3 1.7 11.7 18.7 23.2 29.4 32.3 30.4 24.7 19.4 12.1 7.8 17.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 7.5 80.6 252.7 350.0 292.3 122.0 21.9 0.0 0.0 1127.1 HEATING DEG. DAYS(BASE 18 0C) 517.4 455.6 193.8 26.0 1.7 0.0 0.0 0.0 0.0 20.8 177.7 316.8 1709.8 DEWPOINT (MEAN C) -6.4 -5.9 1.5 -1.6 0.4 1.5 4.2 2.3 -0.6 -1.3 -0.1 0.5 -0.5 MIXING RATIO (G/KG) 2.66 2.84 4.83 3.90 4.57 4.91 5.94 5.14 4.30 3.96 4.33 4.46 4.32 VAPOUR PRESSURE (HPA) 3.91 4.18 7.03 5.70 6.66 7.10 8.57 7.45 6.25 5.80 6.34 6.53 6.29 SATURATION DEF. (HPA) 2.87 2.93 7.30 18.55 25.44 39.62 44.50 40.70 28.75 18.93 8.48 4.02 20.17 RELATIVE HUMIDITY (MEAN %) 62 62 54 28 26 18 18 18 21 28 47 66 37 RELATIVE HUMIDITY (MAX. %) 80 80 76 50 45 32 32 31 38 43 68 84 55 RELATIVE HUMIDITY (MIN. %) 39 40 32 13 13 9 10 9 10 15 26 41 21 RELATIVE HUMIDITY (MEAN% 03UTC) 75 73 69 49 40 31 32 30 35 41 67 80 52 RELATIVE HUMIDITY (MEAN% 09UTC) 47 47 39 16 17 11 13 12 17 18 33 48 27 RELATIVE HUMIDITY (MEAN% 15UTC) 53 58 42 18 17 10 10 10 13 21 37 57 29 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 30.4 32.4 16.3 0.4 5.6 8.0 0.0 0.0 0.0 0.0 7.2 38.5 138.8 DAYS WITH PRECIPITATION >=10 0 0 0 0 0 0 0 0 0 0 0 1 1 DAYS WITH PRECIPITATION >= 5 3 4 1 0 1 1 0 0 0 0 0 3 13 DAYS WITH PRECIPITATION >= 1 6 6 5 0 1 1 0 0 0 0 4 4 27 DAYS WITH PRECIPITATION 9 8 8 2 4 1 0 0 0 0 4 6 42 GREATEST DAILY PRECIPITATION 8.1 9.3 6.0 0.3 5.4 8.0 0.0 0.0 0.0 0.0 4.0 18.6 18.6 DAY 29 22 16 29 7 7 ** ** ** ** 12 4 DAY WITH THUNDER STORM 0 0 1 0 0 0 0 0 0 0 0 0 1 DAYS WITH SNOW OR SLEET 8 6 0 0 0 0 0 0 0 0 0 0 14 DAYS WITH DUST 0 1 0 2 1 1 2 1 0 1 0 0 9 WIND DIRECTION (PREVAILING) 270 270 270 270 270 90 90 90 90 315 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.6 8.4 10.0 8.8 8.7 8.6 10.8 9.4 6.6 7.5 6.7 8.1 8.5 PREVAILING WIND PERCENT 23.4 42.4 28.6 27.5 22.2 15.8 42.3 49.2 17.9 15.3 14.2 12.5 18.4 CALMS PERCENT OF WIND 64.9 40.2 42.3 37.1 43.5 41.3 37.4 33.9 45.0 50.0 68.8 75.4 48.4 NO. OF WIND OBSERVATION 248 224 248 240 248 240 246 248 240 248 240 248 2918 VECTOR WIND DIRECTION (MEAN) 278 283 282 290 290 323 95 95 325 304 283 282 302 VECTOR WIND MAGNITUDE(KNOTS) 2.2 4.4 3.3 3.0 1.7 0.5 4.6 5.3 1.0 1.3 1.0 1.1 0.8 WIND STEADINESES (MEAN %) 75.9 89.8 66.0 54.5 37.0 10.2 74.2 89.8 24.4 34.2 50.0 61.1 18.6 WIND SPEED (MEAN KNOTS) 2.9 4.9 5.0 5.5 4.6 4.9 6.2 5.9 4.1 3.8 2.0 1.8 4.3 FASTEST WIND DIRECTION 280 300 270 310 290 290 110 90 330 300 270 280 290 FASTEST WIND SPEED (KNOTS) 21 29 29 27 35 23 25 19 21 23 19 31 35 DAY 26 28 30 29 18 1 4 6 19 2 25 5 DAYS WITH SKY CLEAR (0-2)/8 15 15 11 10 20 29 30 27 28 24 19 15 243 DAYS WITH P.CLOUDY (3-6)/8 10 6 8 16 9 1 1 4 2 6 9 11 83 DAYS WITH CLOUDY (7-8)/8 6 7 12 4 2 0 0 0 0 1 2 5 39 DAYS WITH VISIBILITY =< 2 KM 4 4 0 0 0 0 0 0 0 0 0 0 8 DURATION OF SUNSHINE HOURS 193.2 203.3 211.9 272.3 322.0 373.8 373.0 348.1 319.7 281.0 223.4 192.2 3313.9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 918.1 920.0 913.1 914.8 912.8 907.6 907.7 908.2 911.3 916.9 918.4 916.9 913.8 MAX. QFE PRESSURE IN HPA 926.7 929.4 920.2 921.8 920.7 913.0 914.2 915.7 924.0 925.0 925.0 923.2 929.4 DAY-HOUR 27- 6 4- 6 7- 6 2- 6 1- 6 2- 6 21- 6 20- 6 23- 6 25- 6 22- 6 18- 6 MIN. QFE PRESSURE IN HPA 909.6 909.5 901.0 908.5 902.5 900.2 900.2 899.4 903.5 908.0 912.6 908.8 899.4 DAY-HOUR 17-12 23- 0 29-15 29- 9 31-15 10-15 5-15 1-18 11-15 1-15 19-15 5- 0 MEAN QNH PRESSURE IN HPA 1019.4 1021.5 1013.9 1015.8 1013.6 1007.9 1008.0 1008.6 1012.0 1018.0 1019.7 1018.1 1014.7 MAX. QNH PRESSURE IN HPA 1028.8 1031.7 1021.7 1023.4 1022.2 1013.8 1015.2 1016.8 1025.8 1026.9 1026.9 1024.9 1031.7 DAY-HOUR 27- 6 4- 6 7- 6 2- 6 1- 6 2- 6 21- 6 20- 6 23- 6 25- 6 22- 6 18- 6 MIN. QNH PRESSURE IN HPA 1010.1 1010.0 1000.8 1008.9 1002.4 999.9 999.9 999.0 1003.5 1008.4 1013.4 1009.3 999.0 DAY-HOUR 17-12 23- 0 29-15 29- 9 31-15 10-15 5-15 1-18 11-15 1-15 19-15 5- 0 MEAN QFF PRESSURE IN HPA 1022.8 1024.9 1013.0 1012.1 1008.4 1000.4 999.7 1000.8 1006.3 1014.3 1018.7 1018.9 1011.7 MAX. QFF PRESSURE IN HPA 1034.0 1038.1 1021.5 1022.1 1019.6 1007.8 1006.8 1010.1 1022.4 1025.6 1028.0 1027.0 1038.1 DAY-HOUR 30- 6 4- 6 7- 6 2- 6 1- 6 2- 3 21- 6 20- 6 23- 6 25- 6 22- 6 18- 6 MIN. QFF PRESSURE IN HPA 1012.4 1010.4 999.9 1003.3 995.7 992.3 991.4 991.1 996.7 1004.1 1011.9 1008.9 991.1 DAY-HOUR 17-12 23- 0 29-12 29- 9 31-15 30-18 5-15 1-18 11-12 1-15 19-12 5- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 918.0 919.7 912.9 914.9 912.8 907.9 907.8 908.2 911.3 916.9 918.4 916.8 913.8 MAX. QFE PRESSURE IN HPA 925.2 926.6 919.2 919.6 917.4 911.1 912.1 913.3 921.5 923.6 922.6 922.0 926.6 DAY 31 4 8 2 1 4 20 20 24 25 8 19 MIN. QFE PRESSURE IN HPA 910.9 909.5 903.8 909.2 908.5 903.0 902.2 901.6 906.0 910.0 912.8 908.8 901.6 DAY 12 23 29 29 31 10 6 2 12 2 20 5 MEAN QNH PRESSURE IN HPA 1019.3 1021.1 1013.8 1015.9 1013.7 1008.2 1008.2 1008.6 1012.0 1018.1 1019.7 1017.9 1014.7 MAX. QNH PRESSURE IN HPA 1027.1 1028.6 1020.6 1021.0 1018.6 1011.8 1012.9 1014.2 1023.1 1025.4 1024.3 1023.6 1028.6 DAY 31 4 8 2 1 4 20 20 24 25 8 19 MIN. QNH PRESSURE IN HPA 1011.6 1010.0 1003.8 1009.7 1008.9 1003.0 1002.1 1001.4 1006.2 1010.6 1013.6 1009.3 1001.4 DAY 12 23 29 29 31 10 6 2 12 2 20 5 MEAN QFF PRESSURE IN HPA 1022.2 1024.1 1012.6 1012.2 1008.6 1000.8 999.8 1000.7 1006.0 1013.9 1018.3 1018.3 1011.4 MAX. QFF PRESSURE IN HPA 1032.8 1034.0 1018.7 1020.0 1015.6 1005.0 1005.6 1007.1 1020.1 1023.6 1024.3 1024.9 1034.0 DAY 31 4 1 2 1 4 23 20 24 25 23 19 MIN. QFF PRESSURE IN HPA 1012.9 1010.4 1002.4 1004.0 1002.4 995.1 993.6 993.1 999.4 1004.9 1012.1 1008.9 993.1 DAY 3 23 28 29 31 30 2 2 12 2 20 5 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.2 920.0 913.7 915.8 914.2 909.4 909.3 909.7 912.7 917.8 919.1 917.2 914.8 MAX. QFE PRESSURE IN HPA 925.3 927.0 919.0 920.9 919.5 912.5 913.8 915.0 922.6 924.1 923.3 921.2 927.0 DAY 27 4 8 2 1 2 20 20 23 25 8 18 MIN. QFE PRESSURE IN HPA 910.2 909.5 904.4 909.6 909.5 904.5 904.0 903.8 906.8 911.5 914.4 909.5 903.8 DAY 17 23 29 29 31 10 6 2 12 2 20 5 MEAN QNH PRESSURE IN HPA 1019.5 1021.5 1014.6 1016.9 1015.2 1009.9 1009.8 1010.3 1013.5 1019.1 1020.5 1018.4 1015.8 MAX. QNH PRESSURE IN HPA 1027.2 1029.1 1020.4 1022.4 1020.9 1013.3 1014.7 1016.0 1024.3 1025.9 1025.1 1022.8 1029.1 DAY 27 4 8 2 1 2 20 20 23 25 8 18 MIN. QNH PRESSURE IN HPA 1010.8 1010.0 1004.5 1010.1 1010.0 1004.6 1004.0 1003.8 1007.1 1012.2 1015.4 1010.0 1003.8 DAY 17 23 29 29 31 10 6 2 12 2 20 5 MEAN QFF PRESSURE IN HPA 1023.2 1025.3 1013.9 1014.0 1010.3 1002.6 1001.6 1002.9 1008.3 1016.1 1020.2 1019.5 1013.2 MAX. QFF PRESSURE IN HPA 1032.3 1035.2 1020.1 1021.6 1018.3 1007.8 1006.5 1009.4 1021.5 1025.4 1026.2 1025.0 1035.2 DAY 31 4 7 2 1 2 23 20 23 25 22 18 MIN. QFF PRESSURE IN HPA 1013.5 1011.5 1003.9 1005.2 1003.6 997.1 995.9 996.3 1000.5 1007.5 1015.5 1009.7 995.9 DAY 12 23 16 29 31 30 2 2 12 2 20 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 919.5 921.4 914.8 916.7 914.8 909.9 910.1 910.7 913.7 919.1 920.5 918.6 915.8 MAX. QFE PRESSURE IN HPA 926.7 929.4 920.2 921.8 920.7 913.0 914.2 915.7 924.0 925.0 925.0 923.2 929.4 DAY 27 4 7 2 1 2 21 20 23 25 22 18 MIN. QFE PRESSURE IN HPA 910.4 910.1 904.8 910.0 909.8 904.5 905.5 904.8 907.5 912.6 916.0 912.6 904.5 DAY 17 23 29 29 31 10 1 2 12 2 16 5 MEAN QNH PRESSURE IN HPA 1021.0 1023.0 1015.8 1017.9 1015.8 1010.5 1010.7 1011.3 1014.6 1020.5 1022.0 1019.9 1016.9 MAX. QNH PRESSURE IN HPA 1028.8 1031.7 1021.7 1023.4 1022.2 1013.8 1015.2 1016.8 1025.8 1026.9 1026.9 1024.9 1031.7 DAY 27 4 7 2 1 2 21 20 23 25 22 18 MIN. QNH PRESSURE IN HPA 1011.0 1010.7 1004.9 1010.6 1010.4 1004.6 1005.7 1004.9 1007.9 1013.4 1017.1 1013.4 1004.6 DAY 17 23 29 29 31 10 1 2 12 2 16 5 MEAN QFF PRESSURE IN HPA 1024.8 1026.9 1015.0 1014.1 1010.5 1002.8 1002.2 1003.5 1008.9 1016.9 1021.3 1021.2 1014.0 MAX. QFF PRESSURE IN HPA 1034.0 1038.1 1021.5 1022.1 1019.6 1007.7 1006.8 1010.1 1022.4 1025.6 1028.0 1027.0 1038.1 DAY 30 4 7 2 1 2 21 20 23 25 22 18 MIN. QFF PRESSURE IN HPA 1013.8 1012.0 1003.8 1004.9 1003.0 996.9 996.5 996.8 1001.3 1008.7 1016.7 1013.8 996.5 DAY 17 23 29 29 31 30 1 2 12 2 16 5 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.4 920.6 913.6 915.2 913.2 908.3 908.5 909.0 911.9 917.2 918.6 917.0 914.3 MAX. QFE PRESSURE IN HPA 925.6 928.8 919.7 920.1 917.1 911.5 912.9 914.4 922.4 924.1 923.7 922.2 928.8 DAY 27 4 8 2 1 2 20 19 23 24 8 18 MIN. QFE PRESSURE IN HPA 910.2 910.8 902.4 908.5 906.5 902.4 903.7 902.2 906.0 910.5 914.4 911.7 902.2 DAY 17 23 29 29 31 10 6 1 11 1 16 5 MEAN QNH PRESSURE IN HPA 1019.7 1022.1 1014.5 1016.2 1014.1 1008.7 1008.9 1009.5 1012.7 1018.4 1019.9 1018.2 1015.2 MAX. QNH PRESSURE IN HPA 1027.6 1031.0 1021.1 1021.6 1018.3 1012.2 1013.7 1015.4 1024.1 1025.9 1025.5 1023.9 1031.0 DAY 27 4 8 2 1 2 20 19 23 24 8 18 MIN. QNH PRESSURE IN HPA 1010.8 1011.5 1002.3 1008.9 1006.8 1002.3 1003.7 1002.1 1006.2 1011.1 1015.4 1012.4 1002.1 DAY 17 23 29 29 31 10 6 1 11 1 16 5 MEAN QFF PRESSURE IN HPA 1022.7 1025.3 1013.3 1012.2 1008.7 1001.0 1000.5 1001.5 1006.6 1014.3 1018.5 1018.6 1011.9 MAX. QFF PRESSURE IN HPA 1032.2 1036.3 1020.1 1020.1 1015.5 1005.8 1005.1 1008.0 1020.4 1024.0 1025.0 1025.4 1036.3 DAY 30 4 8 2 1 2 25 19 23 25 22 18 MIN. QFF PRESSURE IN HPA 1012.7 1011.8 1001.1 1003.3 999.4 994.8 995.1 994.6 998.6 1006.6 1014.1 1012.3 994.6 DAY 17 23 29 29 31 10 6 1 11 1 20 5 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 916.9 919.1 911.8 913.2 911.4 906.2 906.4 906.7 909.8 915.3 917.0 915.7 912.4 MAX. QFE PRESSURE IN HPA 923.4 926.5 917.8 917.9 916.0 909.2 910.9 911.8 920.0 921.9 921.6 921.4 926.5 DAY 30 4 8 2 1 3 20 19 23 24 8 18 MIN. QFE PRESSURE IN HPA 909.6 910.7 901.2 908.8 903.5 901.2 901.8 901.2 903.8 908.8 912.7 912.4 901.2 DAY 17 22 29 29 31 10 5 1 11 1 16 5 MEAN QNH PRESSURE IN HPA 1018.1 1020.5 1012.5 1014.0 1012.1 1006.4 1006.7 1007.0 1010.3 1016.4 1018.2 1016.8 1013.2 MAX. QNH PRESSURE IN HPA 1025.2 1028.5 1019.1 1019.2 1017.1 1009.7 1011.6 1012.5 1021.5 1023.5 1023.2 1023.0 1028.5 DAY 30 4 8 2 1 3 20 19 23 24 8 18 MIN. QNH PRESSURE IN HPA 1010.1 1011.3 1001.0 1009.3 1003.5 1001.0 1001.6 1001.0 1003.8 1009.3 1013.5 1013.2 1001.0 DAY 17 22 29 29 31 10 5 1 11 1 16 5 MEAN QFF PRESSURE IN HPA 1021.0 1023.3 1011.3 1010.2 1007.0 998.9 998.3 999.1 1004.4 1012.2 1016.7 1017.1 1010.0 MAX. QFF PRESSURE IN HPA 1029.8 1033.8 1017.8 1017.8 1014.3 1003.3 1003.1 1005.2 1017.4 1022.1 1022.4 1024.1 1033.8 DAY 30 4 7 2 1 2 23 19 23 25 22 18 MIN. QFF PRESSURE IN HPA 1012.4 1011.4 999.9 1004.4 996.7 993.3 991.9 992.8 996.7 1004.7 1011.9 1012.8 991.9 DAY 17 23 29 29 31 30 14 2 11 1 19 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 917.3 919.3 911.9 913.1 911.0 905.4 905.4 906.0 909.2 915.3 917.3 916.3 912.3 MAX. QFE PRESSURE IN HPA 923.8 925.8 917.9 917.3 915.2 908.7 910.0 911.5 920.0 922.7 921.8 922.6 925.8 DAY 30 4 8 2 1 13 20 19 23 24 8 18 MIN. QFE PRESSURE IN HPA 911.1 911.2 901.0 910.0 902.5 900.2 900.2 900.2 903.5 908.0 912.6 912.1 900.2 DAY 2 22 29 29 31 10 5 1 11 1 19 31 MEAN QNH PRESSURE IN HPA 1018.6 1020.7 1012.7 1013.9 1011.7 1005.5 1005.6 1006.2 1009.7 1016.3 1018.5 1017.5 1013.1 MAX. QNH PRESSURE IN HPA 1025.6 1027.8 1019.2 1018.5 1016.2 1009.2 1010.6 1012.2 1021.5 1024.4 1023.4 1024.3 1027.8 DAY 30 4 8 2 1 13 20 19 23 24 8 18 MIN. QNH PRESSURE IN HPA 1011.8 1011.9 1000.8 1010.6 1002.4 999.9 999.9 999.9 1003.5 1008.4 1013.4 1012.9 999.9 DAY 2 22 29 29 31 10 5 1 11 1 19 31 MEAN QFF PRESSURE IN HPA 1022.3 1024.3 1011.9 1010.9 1006.8 998.2 997.5 998.8 1004.6 1013.3 1018.2 1018.6 1010.4 MAX. QFF PRESSURE IN HPA 1031.2 1033.4 1018.1 1017.4 1013.7 1002.5 1002.9 1005.4 1018.5 1023.7 1024.6 1026.3 1033.4 DAY 30 4 8 1 1 2 22 19 23 24 22 18 MIN. QFF PRESSURE IN HPA 1014.1 1013.1 1000.0 1006.4 995.7 992.5 991.4 992.8 996.8 1004.1 1013.2 1013.1 991.4 DAY 2 22 29 15 31 30 5 1 11 1 19 4 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 918.3 920.2 913.0 914.7 912.3 906.5 906.6 907.3 910.7 916.6 918.2 917.0 913.4 MAX. QFE PRESSURE IN HPA 925.4 927.4 918.6 918.8 916.8 910.4 911.2 912.7 920.5 923.2 922.6 923.0 927.4 DAY 30 3 7 10 14 3 20 19 23 24 8 18 MIN. QFE PRESSURE IN HPA 912.0 910.7 903.5 911.2 905.4 901.5 901.5 899.4 905.4 909.8 913.4 912.1 899.4 DAY 11 22 29 28 31 30 6 1 11 1 19 4 MEAN QNH PRESSURE IN HPA 1019.6 1021.7 1013.9 1015.6 1013.1 1006.8 1006.9 1007.6 1011.4 1017.7 1019.5 1018.2 1014.3 MAX. QNH PRESSURE IN HPA 1027.3 1029.5 1019.9 1020.2 1018.0 1011.0 1011.9 1013.5 1022.0 1024.9 1024.3 1024.7 1029.5 DAY 30 3 7 10 14 3 20 19 23 24 8 18 MIN. QNH PRESSURE IN HPA 1012.8 1011.3 1003.5 1011.9 1005.6 1001.3 1001.3 999.0 1005.6 1010.4 1014.3 1012.9 999.0 DAY 11 22 29 28 31 30 6 1 11 1 19 4 MEAN QFF PRESSURE IN HPA 1023.4 1025.3 1013.0 1011.8 1007.6 999.1 998.4 999.8 1005.7 1014.2 1018.7 1019.4 1011.4 MAX. QFF PRESSURE IN HPA 1033.2 1035.0 1019.5 1018.6 1015.1 1003.9 1003.6 1006.6 1018.4 1023.6 1025.0 1026.6 1035.0 DAY 30 3 7 1 1 3 28 19 23 24 22 18 MIN. QFF PRESSURE IN HPA 1014.7 1012.7 1002.7 1006.3 998.0 992.3 992.9 991.1 999.0 1005.8 1013.6 1012.4 991.1 DAY 11 22 29 28 31 30 6 1 11 1 19 4 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 918.3 920.0 913.2 915.0 912.7 907.2 907.3 907.9 911.2 916.9 918.3 916.9 913.7 MAX. QFE PRESSURE IN HPA 925.7 926.9 918.9 919.4 916.6 911.1 911.3 913.1 921.0 923.4 922.6 923.0 926.9 DAY 30 3 7 1 1 3 19 19 23 24 8 18 MIN. QFE PRESSURE IN HPA 911.5 909.8 904.3 911.2 906.6 902.0 902.2 901.0 906.0 910.0 912.8 910.4 901.0 DAY 2 22 15 28 31 9 5 1 11 1 19 4 MEAN QNH PRESSURE IN HPA 1019.6 1021.5 1014.1 1016.1 1013.5 1007.6 1007.6 1008.3 1011.8 1018.0 1019.6 1018.1 1014.6 MAX. QNH PRESSURE IN HPA 1027.7 1029.0 1020.3 1020.8 1017.8 1011.8 1012.0 1014.0 1022.6 1025.2 1024.3 1024.7 1029.0 DAY 30 3 7 1 1 3 19 19 23 24 8 18 MIN. QNH PRESSURE IN HPA 1012.2 1010.4 1004.4 1011.9 1006.9 1001.9 1002.1 1000.8 1006.2 1010.6 1013.6 1011.0 1000.8 DAY 2 22 15 28 31 9 5 1 11 1 19 4 MEAN QFF PRESSURE IN HPA 1022.7 1024.5 1012.8 1012.0 1007.9 999.9 999.2 1000.3 1005.9 1014.0 1018.1 1018.6 1011.3 MAX. QFF PRESSURE IN HPA 1033.3 1034.2 1019.1 1019.4 1015.1 1004.5 1004.2 1006.7 1019.2 1023.5 1024.1 1026.2 1034.2 DAY 30 3 7 1 1 3 22 19 23 24 22 18 MIN. QFF PRESSURE IN HPA 1013.3 1011.0 1002.5 1005.9 998.8 992.7 993.5 992.3 998.8 1005.3 1012.1 1010.6 992.3 DAY 2 22 15 28 31 30 5 1 11 1 19 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 2.7 5.4 11.1 17.9 25.1 30.9 32.2 31.5 26.3 18.5 12.3 5.3 18.3 MINIMUN AIR TEMPERATURE (C) -1.9 0.2 4.0 9.1 15.1 19.9 23.3 21.8 14.6 9.9 3.3 -1.7 9.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 13 28 21 0 0 0 0 62 DAYS WITH MINIMUM TEMP. <=-4 9 1 2 0 0 0 0 0 0 0 0 9 21 DAYS WITH FREEZING MIN.<= 0 22 16 5 0 0 0 0 0 0 0 10 20 73 TEMPERATURE RECORDS LOWEST(C) -6.0 -4.0 -5.0 4.0 11.0 13.0 18.2 18.0 11.0 3.0 -2.8 -10.0 -10.0 DAY 14 1 21 3 15 1 20 8 30 20 15 27 MAXIMUM AIR TEMPERATURE (C) 8.0 11.2 18.6 26.0 34.1 39.6 40.2 40.0 37.1 27.4 22.1 12.9 26.4 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 7 28 30 31 31 30 11 0 0 168 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 14.0 19.0 24.0 34.6 40.8 43.0 44.2 44.0 40.0 33.0 28.0 22.0 44.2 DAY 5 28 8 27 25 29 28 6 6 1 7 1 DIF. BETWEEN (MAX.-MIN.) (C) 9.9 11.0 14.6 16.9 19.0 19.7 16.9 18.2 22.5 17.5 18.8 14.6 16.6 MEAN DAILY TEMP. (MDT) (C) 3.0 5.7 11.3 17.6 24.6 29.7 31.7 30.9 25.9 18.7 12.7 5.6 18.1 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 15.2 118.0 262.3 332.7 305.9 145.7 8.5 0.0 0.0 1188.4 HEATING DEG. DAYS(BASE 18 0C) 464.2 344.4 208.6 51.3 0.0 0.0 0.0 0.0 0.0 30.8 159.1 384.1 1642.5 DEWPOINT (MEAN C) -2.3 -1.5 -2.2 -0.5 -0.1 -0.7 4.7 5.3 -1.0 1.4 -2.5 -5.1 -0.4 MIXING RATIO (G/KG) 3.60 3.82 3.73 4.30 4.36 4.23 6.12 6.37 4.10 4.85 3.61 2.96 4.34 VAPOUR PRESSURE (HPA) 5.28 5.59 5.46 6.25 6.34 6.12 8.83 9.20 5.96 7.09 5.30 4.35 6.31 SATURATION DEF. (HPA) 2.36 3.74 8.61 15.86 27.77 41.16 41.67 39.48 31.22 15.76 10.39 5.42 20.29 RELATIVE HUMIDITY (MEAN %) 72 65 44 35 23 15 20 22 20 36 39 51 37 RELATIVE HUMIDITY (MAX. %) 88 83 69 61 40 28 33 37 36 54 60 70 55 RELATIVE HUMIDITY (MIN. %) 49 46 22 16 10 7 11 12 8 19 19 30 21 RELATIVE HUMIDITY (MEAN% 03UTC) 82 79 64 56 37 26 32 37 36 52 60 68 52 RELATIVE HUMIDITY (MEAN% 09UTC) 58 52 28 20 15 10 14 15 11 23 22 35 25 RELATIVE HUMIDITY (MEAN% 15UTC) 67 57 32 24 14 8 13 13 12 30 30 45 29 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 25.3 27.5 1.0 6.4 0.4 0.0 0.8 0.0 0.0 13.0 0.0 16.0 90.4 DAYS WITH PRECIPITATION >=10 0 1 0 0 0 0 0 0 0 0 0 1 2 DAYS WITH PRECIPITATION >= 5 2 2 0 0 0 0 0 0 0 2 0 1 7 DAYS WITH PRECIPITATION >= 1 6 6 0 2 0 0 0 0 0 3 0 2 19 DAYS WITH PRECIPITATION 13 8 3 4 2 0 2 0 0 3 0 2 37 GREATEST DAILY PRECIPITATION 9.4 10.0 0.6 4.0 0.2 0.0 0.6 0.0 0.0 6.0 0.0 13.0 13.0 DAY 8 10 27 2 12 ** 7 ** ** 27 ** 25 DAY WITH THUNDER STORM 0 0 0 0 0 0 0 0 0 1 0 0 1 DAYS WITH SNOW OR SLEET 7 4 0 0 0 0 0 0 0 0 0 1 12 DAYS WITH DUST 1 1 1 2 2 1 4 1 0 0 0 0 13 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.5 9.2 9.4 7.6 9.1 8.0 10.1 11.0 7.6 8.3 6.6 7.1 8.0 PREVAILING WIND PERCENT 17.7 25.4 19.8 36.3 31.0 24.2 44.8 38.7 19.6 16.1 9.2 13.7 18.1 CALMS PERCENT OF WIND 68.1 52.2 45.6 32.5 29.4 36.3 32.7 41.5 55.0 59.3 74.6 64.9 49.3 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 282 287 284 288 294 300 90 92 84 297 281 298 312 VECTOR WIND MAGNITUDE(KNOTS) 1.8 3.1 2.1 3.9 3.1 1.3 4.8 4.4 1.2 1.2 0.7 1.1 0.8 WIND STEADINESES (MEAN %) 72.0 75.6 46.7 68.4 47.7 25.5 78.7 77.2 38.7 38.7 46.7 45.8 19.0 WIND SPEED (MEAN KNOTS) 2.5 4.1 4.5 5.7 6.5 5.1 6.1 5.7 3.1 3.1 1.5 2.4 4.2 FASTEST WIND DIRECTION 260 290 280 300 310 90 110 120 100 270 270 320 310 FASTEST WIND SPEED (KNOTS) 25 41 39 27 43 19 23 23 16 29 19 23 43 DAY 23 16 14 29 12 12 17 6 9 27 12 25 DAYS WITH SKY CLEAR (0-2)/8 6 11 17 14 24 27 21 28 30 23 22 14 237 DAYS WITH P.CLOUDY (3-6)/8 16 6 8 11 5 3 10 3 0 6 7 16 91 DAYS WITH CLOUDY (7-8)/8 9 11 6 5 2 0 0 0 0 2 1 1 37 DAYS WITH VISIBILITY =< 2 KM 1 2 1 0 1 0 0 0 0 0 0 1 6 DURATION OF SUNSHINE HOURS 152.1 159.4 219.6 ****** ****** ****** ****** ****** ****** ****** 244.7 194.0 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 918.4 915.0 917.2 911.7 910.8 907.2 906.6 907.6 910.5 917.0 918.7 918.6 913.3 MAX. QFE PRESSURE IN HPA 928.6 926.1 928.0 918.8 919.0 916.4 913.1 914.2 916.6 928.1 928.5 930.6 930.6 DAY-HOUR 26- 6 8- 6 10- 6 24- 6 15- 6 1- 6 17- 6 29- 6 24- 6 19- 6 23- 6 28- 6 MIN. QFE PRESSURE IN HPA 910.0 902.8 907.2 900.7 902.9 899.4 900.0 900.7 904.6 908.1 909.4 909.6 899.4 DAY-HOUR 23- 3 15-15 24-15 15-15 12- 9 26-15 4-15 8-15 1-15 1-15 1-12 25- 3 MEAN QNH PRESSURE IN HPA 1019.7 1016.0 1018.4 1012.4 1011.4 1007.5 1006.9 1008.0 1011.1 1018.1 1020.0 1019.9 1014.1 MAX. QNH PRESSURE IN HPA 1030.8 1028.1 1030.2 1020.2 1020.4 1017.5 1014.0 1015.2 1017.8 1030.3 1030.7 1033.0 1033.0 DAY-HOUR 26- 6 8- 6 10- 6 24- 6 15- 6 1- 6 17- 6 29- 6 24- 6 19- 6 23- 6 28- 6 MIN. QNH PRESSURE IN HPA 1010.6 1002.7 1007.5 1000.5 1002.8 999.0 999.7 1000.5 1004.7 1008.5 1009.9 1010.1 999.0 DAY-HOUR 23- 3 15-15 24-15 15-15 12- 9 26-15 4-15 8-15 1-15 1-15 1-12 25- 3 MEAN QFF PRESSURE IN HPA 1022.3 1017.5 1017.8 1009.3 1005.8 999.9 998.8 1000.0 1005.0 1014.8 1019.0 1021.6 1011.0 MAX. QFF PRESSURE IN HPA 1035.6 1031.1 1032.1 1017.8 1016.6 1011.8 1005.9 1008.5 1012.5 1029.2 1031.7 1039.2 1039.2 DAY-HOUR 26- 6 8- 6 21- 6 3- 6 15- 6 1- 6 9- 6 29- 6 27- 6 19- 6 23- 6 28- 6 MIN. QFF PRESSURE IN HPA 1011.9 1003.4 1005.7 996.5 998.3 990.5 992.0 993.1 998.0 1003.7 1005.9 1012.1 990.5 DAY-HOUR 2- 0 15-15 14-12 15-12 12- 9 27-12 29-15 8-18 5-12 1-15 1-12 25- 3 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 918.0 914.8 917.2 911.9 910.9 907.6 906.6 907.6 910.3 917.0 918.5 918.5 913.2 MAX. QFE PRESSURE IN HPA 926.1 923.5 925.4 916.6 916.5 914.6 910.0 911.7 914.6 925.8 927.0 927.8 927.8 DAY 26 8 10 25 15 1 9 30 28 16 23 28 MIN. QFE PRESSURE IN HPA 910.5 905.1 911.6 906.0 904.1 900.8 903.2 903.6 907.0 909.6 910.1 912.0 900.8 DAY 23 16 25 16 13 27 5 8 6 1 1 25 MEAN QNH PRESSURE IN HPA 1019.3 1015.8 1018.4 1012.6 1011.6 1007.9 1006.9 1007.9 1010.9 1018.2 1019.9 1019.9 1014.1 MAX. QNH PRESSURE IN HPA 1028.1 1025.3 1027.3 1017.8 1017.7 1015.6 1010.6 1012.4 1015.6 1027.8 1029.1 1030.0 1030.0 DAY 26 8 10 25 15 1 9 30 28 16 23 28 MIN. QNH PRESSURE IN HPA 1011.1 1005.2 1012.3 1006.2 1004.2 1000.6 1003.2 1003.6 1007.3 1010.1 1010.7 1012.8 1000.6 DAY 23 16 25 16 13 27 5 8 6 1 1 25 MEAN QFF PRESSURE IN HPA 1021.5 1017.0 1017.6 1009.4 1005.9 1000.4 998.6 999.9 1004.5 1014.5 1018.3 1021.0 1010.7 MAX. QFF PRESSURE IN HPA 1032.7 1027.8 1030.0 1014.5 1013.5 1010.4 1002.8 1005.4 1010.1 1025.4 1028.6 1035.2 1035.2 DAY 26 8 21 25 15 1 9 30 28 19 23 28 MIN. QFF PRESSURE IN HPA 1011.9 1004.6 1009.9 1002.3 998.7 991.7 994.1 995.7 1000.3 1005.1 1006.8 1013.3 991.7 DAY 2 16 25 29 12 27 28 20 5 1 1 19 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.2 915.3 918.0 912.9 912.2 909.1 908.2 909.4 911.7 917.9 919.1 918.9 914.2 MAX. QFE PRESSURE IN HPA 927.0 924.3 926.0 918.2 918.0 915.7 912.0 912.7 915.5 926.4 927.3 928.4 928.4 DAY 26 8 10 25 16 1 9 29 28 16 23 28 MIN. QFE PRESSURE IN HPA 910.0 906.3 912.7 907.4 905.1 901.6 904.4 905.4 907.2 911.1 910.1 909.6 901.6 DAY 23 16 25 16 13 27 2 8 5 1 1 25 MEAN QNH PRESSURE IN HPA 1019.6 1016.3 1019.3 1013.8 1013.0 1009.6 1008.6 1009.9 1012.4 1019.1 1020.5 1020.2 1015.2 MAX. QNH PRESSURE IN HPA 1029.1 1026.1 1028.0 1019.5 1019.3 1016.8 1012.8 1013.5 1016.6 1028.4 1029.4 1030.6 1030.6 DAY 26 8 10 25 16 1 9 29 28 16 23 28 MIN. QNH PRESSURE IN HPA 1010.6 1006.6 1013.5 1007.7 1005.2 1001.4 1004.5 1005.6 1007.5 1011.8 1010.7 1010.1 1001.4 DAY 23 16 25 16 13 27 2 8 5 1 1 25 MEAN QFF PRESSURE IN HPA 1022.4 1018.3 1019.2 1011.1 1007.6 1002.3 1000.7 1002.3 1007.1 1016.5 1020.2 1022.4 1012.5 MAX. QFF PRESSURE IN HPA 1034.0 1028.6 1031.1 1017.3 1015.2 1011.7 1005.4 1006.7 1012.1 1027.3 1030.5 1037.0 1037.0 DAY 26 8 21 3 15 1 9 30 28 16 23 28 MIN. QFF PRESSURE IN HPA 1012.4 1007.6 1011.4 1002.7 999.0 992.9 996.0 997.4 1001.2 1006.8 1008.2 1012.1 992.9 DAY 23 16 25 29 12 27 28 20 5 1 1 25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 919.8 916.5 919.1 913.7 912.8 909.6 909.0 910.2 913.0 919.1 920.5 920.2 915.3 MAX. QFE PRESSURE IN HPA 928.6 926.1 928.0 918.8 919.0 916.4 913.1 914.2 916.6 928.1 928.5 930.6 930.6 DAY 26 8 10 24 15 1 17 29 24 19 23 28 MIN. QFE PRESSURE IN HPA 912.5 907.7 914.0 907.8 904.9 902.4 905.1 906.5 908.5 911.9 912.0 911.1 902.4 DAY 23 16 25 16 13 27 2 8 5 14 1 25 MEAN QNH PRESSURE IN HPA 1021.3 1017.7 1020.5 1014.7 1013.6 1010.2 1009.5 1010.8 1013.8 1020.4 1022.0 1021.7 1016.4 MAX. QNH PRESSURE IN HPA 1030.8 1028.1 1030.2 1020.2 1020.4 1017.5 1014.0 1015.2 1017.8 1030.3 1030.7 1033.0 1033.0 DAY 26 8 10 24 15 1 17 29 24 19 23 28 MIN. QNH PRESSURE IN HPA 1013.3 1008.1 1014.9 1008.2 1005.0 1002.3 1005.2 1006.8 1008.9 1012.6 1012.8 1011.8 1002.3 DAY 23 16 25 16 13 27 2 8 5 14 1 25 MEAN QFF PRESSURE IN HPA 1024.3 1019.5 1020.1 1011.5 1007.9 1002.6 1001.4 1002.8 1007.6 1017.2 1021.4 1023.8 1013.3 MAX. QFF PRESSURE IN HPA 1035.6 1031.1 1032.1 1017.8 1016.6 1011.8 1005.9 1008.5 1012.5 1029.2 1031.7 1039.2 1039.2 DAY 26 8 21 3 15 1 9 29 27 19 23 28 MIN. QFF PRESSURE IN HPA 1015.1 1008.9 1012.7 1002.4 1000.1 993.1 996.4 997.9 1001.8 1008.7 1009.5 1014.4 993.1 DAY 1 16 25 29 12 27 28 20 5 1 1 25 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.8 915.5 917.7 911.9 911.2 908.0 907.4 908.6 911.3 917.3 918.9 918.8 913.8 MAX. QFE PRESSURE IN HPA 927.4 925.4 926.3 917.6 918.0 914.2 911.4 912.2 915.6 926.3 927.0 929.0 929.0 DAY 26 8 10 24 16 1 17 29 24 19 22 28 MIN. QFE PRESSURE IN HPA 911.5 907.5 910.7 904.4 902.9 901.5 903.6 904.2 908.0 910.0 910.8 912.1 901.5 DAY 23 16 14 15 12 27 2 7 1 14 1 25 MEAN QNH PRESSURE IN HPA 1020.1 1016.6 1018.9 1012.7 1011.8 1008.4 1007.8 1009.1 1012.0 1018.5 1020.3 1020.2 1014.7 MAX. QNH PRESSURE IN HPA 1029.5 1027.3 1028.3 1018.9 1019.3 1015.2 1012.1 1013.0 1016.7 1028.3 1029.1 1031.3 1031.3 DAY 26 8 10 24 16 1 17 29 24 19 22 28 MIN. QNH PRESSURE IN HPA 1012.2 1007.9 1011.3 1004.5 1002.8 1001.3 1003.6 1004.3 1008.4 1010.6 1011.5 1012.9 1001.3 DAY 23 16 14 15 12 27 2 7 1 14 1 25 MEAN QFF PRESSURE IN HPA 1022.5 1017.8 1018.0 1009.3 1006.1 1000.7 999.5 1001.0 1005.7 1014.7 1018.7 1021.4 1011.3 MAX. QFF PRESSURE IN HPA 1033.3 1029.9 1029.4 1015.3 1014.9 1009.6 1003.8 1005.9 1011.2 1027.0 1028.6 1036.6 1036.6 DAY 26 8 17 3 15 1 9 29 24 19 22 28 MIN. QFF PRESSURE IN HPA 1013.4 1007.5 1008.3 999.9 998.3 992.1 994.6 995.7 1001.1 1006.0 1008.1 1014.8 992.1 DAY 23 16 14 15 12 27 28 7 5 1 1 18 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 917.4 913.7 915.6 909.9 909.2 905.6 905.3 906.1 909.1 915.4 917.3 917.1 911.8 MAX. QFE PRESSURE IN HPA 925.9 923.5 923.5 915.5 915.6 912.2 909.0 909.6 913.1 924.0 925.9 927.5 927.5 DAY 26 8 17 24 16 1 9 2 27 19 22 28 MIN. QFE PRESSURE IN HPA 910.8 904.9 908.0 901.5 903.9 899.7 901.0 902.0 905.3 908.4 909.4 911.6 899.7 DAY 23 15 14 15 12 27 4 8 1 1 1 18 MEAN QNH PRESSURE IN HPA 1018.6 1014.6 1016.6 1010.4 1009.7 1005.8 1005.5 1006.4 1009.6 1016.5 1018.5 1018.3 1012.5 MAX. QNH PRESSURE IN HPA 1027.9 1025.3 1025.3 1016.6 1016.7 1013.0 1009.5 1010.1 1014.0 1025.8 1027.9 1029.6 1029.6 DAY 26 8 17 24 16 1 9 2 27 19 22 28 MIN. QNH PRESSURE IN HPA 1011.5 1005.0 1008.4 1001.3 1003.9 999.4 1000.8 1001.9 1005.5 1008.8 1009.9 1012.3 999.4 DAY 23 15 14 15 12 27 4 8 1 1 1 18 MEAN QFF PRESSURE IN HPA 1020.9 1015.7 1015.7 1007.1 1004.0 998.3 997.2 998.3 1003.3 1012.8 1016.9 1019.5 1009.1 MAX. QFF PRESSURE IN HPA 1031.4 1027.9 1027.4 1013.7 1011.7 1007.5 1001.7 1003.0 1008.1 1024.5 1027.4 1034.7 1034.7 DAY 26 8 17 3 15 1 9 29 24 19 14 28 MIN. QFF PRESSURE IN HPA 1012.6 1004.7 1005.7 996.5 999.2 990.5 992.5 994.7 998.0 1004.0 1005.9 1012.7 990.5 DAY 1 19 14 15 11 27 29 6 5 1 1 18 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 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 917.9 914.1 915.7 910.0 908.8 904.8 904.5 905.3 908.5 915.5 917.7 917.7 911.7 MAX. QFE PRESSURE IN HPA 925.8 923.3 923.4 915.4 914.4 911.0 908.4 909.0 913.0 923.6 926.1 927.5 927.5 DAY 26 7 20 24 15 1 17 2 27 19 22 28 MIN. QFE PRESSURE IN HPA 910.8 902.8 907.2 900.7 904.0 899.4 900.0 900.7 904.6 908.1 910.8 911.6 899.4 DAY 17 15 24 15 11 26 4 8 1 1 1 18 MEAN QNH PRESSURE IN HPA 1019.2 1015.0 1016.8 1010.5 1009.3 1004.9 1004.6 1005.4 1008.9 1016.5 1019.0 1019.0 1012.4 MAX. QNH PRESSURE IN HPA 1027.8 1025.1 1025.2 1016.5 1015.4 1011.7 1008.8 1009.5 1013.8 1025.4 1028.1 1029.6 1029.6 DAY 26 7 20 24 15 1 17 2 27 19 22 28 MIN. QNH PRESSURE IN HPA 1011.5 1002.7 1007.5 1000.5 1004.0 999.0 999.7 1000.5 1004.7 1008.5 1011.5 1012.3 999.0 DAY 17 15 24 15 11 26 4 8 1 1 1 18 MEAN QFF PRESSURE IN HPA 1022.0 1016.8 1016.6 1007.8 1003.9 997.5 996.8 997.8 1003.6 1013.8 1018.7 1021.1 1009.7 MAX. QFF PRESSURE IN HPA 1032.4 1027.5 1027.6 1016.4 1011.3 1006.1 1001.0 1002.1 1009.4 1024.7 1028.5 1036.0 1036.0 DAY 26 7 20 3 15 1 19 2 27 19 22 28 MIN. QFF PRESSURE IN HPA 1012.8 1003.4 1006.8 996.9 998.6 990.7 992.0 993.3 998.4 1003.7 1009.3 1013.8 990.7 DAY 1 15 24 15 11 26 29 8 1 1 1 18 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 918.7 915.2 917.3 911.5 910.4 906.1 905.8 906.6 909.7 916.7 918.7 918.7 912.9 MAX. QFE PRESSURE IN HPA 927.6 924.2 925.3 917.2 914.9 911.4 909.0 910.4 914.2 925.0 926.9 928.0 928.0 DAY 26 7 20 3 16 4 17 2 27 15 23 28 MIN. QFE PRESSURE IN HPA 911.0 906.0 909.8 903.2 905.3 900.4 901.2 901.5 906.5 909.5 912.0 913.0 900.4 DAY 17 15 24 15 11 26 2 8 4 1 1 22 MEAN QNH PRESSURE IN HPA 1020.0 1016.2 1018.5 1012.3 1011.0 1006.3 1006.0 1006.9 1010.2 1017.9 1020.0 1020.1 1013.8 MAX. QNH PRESSURE IN HPA 1029.7 1026.0 1027.2 1018.4 1015.9 1012.1 1009.5 1011.0 1015.2 1026.9 1029.0 1030.2 1030.2 DAY 26 7 20 3 16 4 17 2 27 15 23 28 MIN. QNH PRESSURE IN HPA 1011.7 1006.2 1010.4 1003.2 1005.5 1000.1 1001.0 1001.3 1006.8 1010.0 1012.8 1013.8 1000.1 DAY 17 15 24 15 11 26 2 8 4 1 1 22 MEAN QFF PRESSURE IN HPA 1023.0 1017.9 1018.0 1009.0 1005.2 998.6 997.9 998.9 1004.1 1014.6 1019.4 1022.2 1010.7 MAX. QFF PRESSURE IN HPA 1034.7 1029.0 1030.3 1017.2 1011.0 1004.9 1001.6 1003.6 1009.5 1024.9 1029.9 1036.4 1036.4 DAY 26 7 20 3 15 1 19 29 27 19 23 28 MIN. QFF PRESSURE IN HPA 1013.9 1006.3 1008.2 998.7 998.9 991.2 993.2 993.1 999.5 1005.0 1009.5 1014.7 991.2 DAY 1 19 24 15 11 26 2 8 4 1 1 18 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 918.6 915.0 917.3 911.9 910.9 906.9 906.3 907.2 910.1 917.0 918.9 918.8 913.2 MAX. QFE PRESSURE IN HPA 926.8 924.7 925.9 916.6 914.8 911.8 909.0 911.3 914.6 925.8 926.6 927.8 927.8 DAY 26 7 20 3 15 1 8 29 27 15 22 27 MIN. QFE PRESSURE IN HPA 911.0 905.1 910.8 904.8 904.5 900.8 902.8 902.7 907.0 910.4 912.4 912.3 900.8 DAY 17 15 24 15 12 26 2 8 5 1 1 24 MEAN QNH PRESSURE IN HPA 1019.9 1016.1 1018.6 1012.7 1011.6 1007.2 1006.5 1007.5 1010.7 1018.1 1020.2 1020.1 1014.1 MAX. QNH PRESSURE IN HPA 1028.9 1026.6 1027.9 1017.8 1015.8 1012.5 1009.5 1012.0 1015.6 1027.8 1028.6 1030.0 1030.0 DAY 26 7 20 3 15 1 8 29 27 15 22 27 MIN. QNH PRESSURE IN HPA 1011.7 1005.2 1011.5 1004.9 1004.6 1000.6 1002.7 1002.6 1007.3 1011.0 1013.2 1013.1 1000.6 DAY 17 15 24 15 12 26 2 8 5 1 1 24 MEAN QFF PRESSURE IN HPA 1022.3 1017.2 1017.6 1009.1 1005.8 999.3 998.2 999.4 1004.4 1014.3 1018.6 1021.4 1010.6 MAX. QFF PRESSURE IN HPA 1033.0 1029.2 1030.9 1015.7 1011.4 1005.7 1002.1 1004.9 1009.9 1025.1 1028.0 1035.6 1035.6 DAY 26 7 20 3 14 1 19 29 27 18 22 27 MIN. QFF PRESSURE IN HPA 1012.4 1005.2 1008.9 1000.8 999.0 991.6 993.4 994.2 1000.2 1005.5 1010.0 1013.1 991.6 DAY 1 15 24 15 11 26 28 8 4 1 1 9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION GHOM (40770) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 42 N LONGITUDE 50 51 E DATA PROCESSING CENTER ELEVATION 877.4 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.1 4.4 10.6 19.1 24.3 29.2 32.1 29.6 25.1 18.4 11.0 3.9 17.6 MINIMUN AIR TEMPERATURE (C) -0.9 -1.3 5.0 10.2 14.2 19.4 22.4 18.9 14.8 9.9 2.8 -1.5 9.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 10 25 8 0 0 0 0 43 DAYS WITH MINIMUM TEMP. <=-4 4 6 0 0 0 0 0 0 0 0 1 11 22 DAYS WITH FREEZING MIN.<= 0 24 22 2 0 0 0 0 0 0 0 8 19 75 TEMPERATURE RECORDS LOWEST(C) -6.0 -9.0 -0.5 3.4 8.0 15.0 19.6 13.5 7.5 5.0 -4.0 -8.0 -9.0 DAY 29 14 11 14 7 2 30 26 28 31 26 20 MAXIMUM AIR TEMPERATURE (C) 10.1 10.5 16.7 26.9 30.9 37.1 40.1 39.1 34.6 26.8 19.5 10.6 25.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 8 23 30 31 31 25 2 0 0 150 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 15.0 18.0 24.0 34.5 36.0 41.0 43.5 44.5 40.4 30.4 27.2 16.0 44.5 DAY 31 18 29 22 17 28 7 6 9 27 2 1 DIF. BETWEEN (MAX.-MIN.) (C) 11.0 11.8 11.7 16.7 16.7 17.7 17.7 20.2 19.8 16.9 16.7 12.1 15.8 MEAN DAILY TEMP. (MDT) (C) 4.6 4.6 10.9 18.6 22.6 28.3 31.2 29.0 24.7 18.3 11.2 4.6 17.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 12.1 64.8 217.8 317.1 247.1 123.4 0.0 0.0 0.0 982.4 HEATING DEG. DAYS(BASE 18 0C) 415.0 375.5 220.3 33.2 2.4 0.0 0.0 0.0 1.1 14.0 204.5 416.7 1682.7 DEWPOINT (MEAN C) -1.7 -2.9 2.4 1.6 1.9 3.7 4.4 2.9 2.1 2.7 -0.9 -1.8 1.2 MIXING RATIO (G/KG) 3.79 3.51 5.24 5.00 5.08 5.75 6.08 5.47 5.13 5.32 3.97 3.83 4.85 VAPOUR PRESSURE (HPA) 5.55 5.15 7.63 7.28 7.37 8.31 8.76 7.91 7.47 7.78 5.83 5.61 7.05 SATURATION DEF. (HPA) 2.93 3.70 5.76 16.25 24.80 34.10 41.03 36.52 27.04 14.59 8.34 2.92 18.17 RELATIVE HUMIDITY (MEAN %) 69 63 61 37 27 22 20 21 26 39 47 70 42 RELATIVE HUMIDITY (MAX. %) 86 85 83 64 47 39 36 40 44 60 66 85 61 RELATIVE HUMIDITY (MIN. %) 46 39 37 17 15 12 11 10 13 21 29 48 25 RELATIVE HUMIDITY (MEAN% 03UTC) 83 82 77 61 47 37 32 37 41 57 65 82 58 RELATIVE HUMIDITY (MEAN% 09UTC) 53 48 45 21 20 15 14 13 18 26 33 54 30 RELATIVE HUMIDITY (MEAN% 15UTC) 61 50 51 23 21 14 13 11 17 30 37 65 33 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 19.4 30.1 40.0 16.6 3.8 0.0 0.0 0.0 0.0 3.5 0.8 15.3 129.5 DAYS WITH PRECIPITATION >=10 0 1 1 1 0 0 0 0 0 0 0 0 3 DAYS WITH PRECIPITATION >= 5 1 3 2 1 0 0 0 0 0 0 0 1 8 DAYS WITH PRECIPITATION >= 1 5 5 5 2 1 0 0 0 0 1 0 4 23 DAYS WITH PRECIPITATION 5 7 10 2 2 0 0 0 0 4 1 7 38 GREATEST DAILY PRECIPITATION 7.0 11.0 18.0 13.6 3.0 0.0 0.0 0.0 0.0 2.2 0.8 5.0 18.0 DAY 3 22 25 4 17