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 ** ** ** ** 16 16 25 DAY WITH THUNDER STORM 0 0 0 0 0 0 0 0 0 1 0 0 1 DAYS WITH SNOW OR SLEET 2 3 0 0 0 0 0 0 0 0 0 3 8 DAYS WITH DUST 3 1 0 0 6 2 5 2 0 0 0 0 19 WIND DIRECTION (PREVAILING) 270 270 270 315 315 90 90 90 90 90 270 270 90 PREVAILING WIND SPEED(KNOTS) 9.1 7.2 9.1 10.4 10.8 11.0 12.2 10.9 9.5 9.0 7.3 7.8 10.2 PREVAILING WIND PERCENT 6.9 20.1 15.7 20.0 34.1 26.3 47.2 34.3 23.3 10.5 9.2 17.3 15.0 CALMS PERCENT OF WIND 79.8 63.8 55.6 40.8 24.0 35.4 32.7 54.0 48.8 64.5 67.1 69.0 53.6 NO. OF WIND OBSERVATION 248 224 248 240 179 240 248 248 240 248 240 248 2851 VECTOR WIND DIRECTION (MEAN) 288 287 298 297 306 65 91 92 72 349 271 283 2 VECTOR WIND MAGNITUDE(KNOTS) 0.9 1.9 1.6 2.9 4.9 2.1 6.1 4.1 1.3 0.2 0.6 1.8 0.6 WIND STEADINESES (MEAN %) 60.0 73.1 44.4 55.8 67.1 34.4 81.3 91.1 29.5 7.4 25.0 78.3 14.3 WIND SPEED (MEAN KNOTS) 1.5 2.6 3.6 5.2 7.3 6.1 7.5 4.5 4.4 2.7 2.4 2.3 4.2 FASTEST WIND DIRECTION 230 260 280 330 300 70 90 100 100 100 210 300 260 FASTEST WIND SPEED (KNOTS) 23 29 19 25 29 19 23 21 21 19 19 19 29 DAY 5 4 7 13 17 15 1 21 11 1 14 16 DAYS WITH SKY CLEAR (0-2)/8 9 9 7 12 20 29 31 31 30 18 19 15 230 DAYS WITH P.CLOUDY (3-6)/8 16 9 15 16 9 1 0 0 0 12 11 6 95 DAYS WITH CLOUDY (7-8)/8 6 10 9 2 2 0 0 0 0 1 0 10 40 DAYS WITH VISIBILITY =< 2 KM 5 1 0 0 3 0 1 0 0 0 0 2 12 DURATION OF SUNSHINE HOURS 150.4 156.1 171.6 258.1 282.3 352.1 359.4 336.1 314.6 246.9 210.6 140.7 2978.9 ======================================================================================================================= 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 MEAN QFE PRESSURE IN HPA 917.9 918.0 914.2 913.3 909.6 908.2 905.4 907.4 913.0 917.5 919.2 916.9 913.4 MAX. QFE PRESSURE IN HPA 927.0 930.5 923.0 920.8 918.4 916.1 911.4 913.5 921.7 923.3 926.0 927.1 930.5 DAY-HOUR 12- 6 15- 6 12- 6 19- 6 25- 3 23- 6 12- 6 23- 6 27- 6 13- 6 24- 6 17- 6 MIN. QFE PRESSURE IN HPA 906.4 909.0 904.0 904.8 901.0 897.6 898.8 900.8 904.0 911.8 911.0 908.6 897.6 DAY-HOUR 24-15 20-12 6-15 4-12 22-15 11-15 13-18 11-15 8-12 4-12 4-12 31-21 MEAN QNH PRESSURE IN HPA 1019.2 1019.3 1015.2 1014.2 1010.2 1008.6 1005.6 1007.8 1013.9 1018.7 1020.6 1018.0 1014.3 MAX. QNH PRESSURE IN HPA 1029.1 1032.9 1024.7 1022.3 1019.7 1017.2 1012.1 1014.4 1023.3 1025.1 1028.0 1029.2 1032.9 DAY-HOUR 12- 6 15- 6 12- 6 19- 6 25- 3 23- 6 12- 6 23- 6 27- 6 13- 6 24- 6 17- 6 MIN. QNH PRESSURE IN HPA 1006.7 1009.5 1004.0 1004.9 1000.8 997.1 998.4 1000.6 1004.0 1012.5 1011.7 1009.1 997.1 DAY-HOUR 24-15 20-12 6-15 4-12 22-15 11-15 13-18 11-15 8-12 4-12 4-12 31-21 MEAN QFF PRESSURE IN HPA 1021.2 1021.3 1014.6 1010.6 ****** 1001.5 997.5 1000.5 1008.2 1015.4 1020.1 1020.1 ****** MAX. QFF PRESSURE IN HPA 1032.7 1037.4 1026.8 1020.6 ****** 1009.6 1005.1 1007.6 1019.6 1021.8 1029.9 1033.0 ****** DAY-HOUR 12- 6 15- 6 12- 6 14- 3 **-** 23- 6 12- 6 27- 6 27- 6 13- 6 27- 6 17- 6 MIN. QFF PRESSURE IN HPA 1007.1 1008.2 1003.7 1001.5 ****** 989.8 990.4 993.0 996.3 1008.3 1008.1 1009.1 ****** DAY-HOUR 24-12 21- 0 6-15 4-12 **-** 11-15 13-21 6-15 8-12 4-12 5-12 1-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 918.1 917.8 914.0 913.4 ****** 908.4 905.4 907.4 913.1 917.4 919.4 916.9 ****** MAX. QFE PRESSURE IN HPA 926.0 928.0 920.0 918.6 ****** 914.0 909.8 911.0 919.3 920.8 924.0 924.6 ****** DAY 13 15 12 14 ** 23 12 23 27 17 27 17 MIN. QFE PRESSURE IN HPA 908.0 909.0 904.2 905.8 ****** 900.4 898.8 903.1 906.0 914.4 912.5 909.9 ****** DAY 26 21 7 10 ** 12 14 12 8 15 5 2 MEAN QNH PRESSURE IN HPA 1019.4 1019.1 1015.0 1014.3 ****** 1008.8 1005.6 1007.7 1013.9 1018.7 1020.8 1018.1 ****** MAX. QNH PRESSURE IN HPA 1028.0 1030.2 1021.5 1019.9 ****** 1014.9 1010.4 1011.7 1020.7 1022.3 1025.8 1026.5 ****** DAY 13 15 12 14 ** 23 12 23 27 17 27 17 MIN. QNH PRESSURE IN HPA 1008.4 1009.5 1004.3 1006.0 ****** 1000.1 998.4 1003.1 1006.2 1015.4 1013.3 1010.5 ****** DAY 26 21 7 10 ** 12 14 12 8 15 5 2 MEAN QFF PRESSURE IN HPA 1021.1 1020.8 1014.2 1010.6 ****** 1001.7 997.3 1000.2 1008.0 1015.1 1019.8 1019.7 ****** MAX. QFF PRESSURE IN HPA 1030.4 1034.2 1022.8 1018.5 ****** 1007.6 1003.2 1004.9 1017.2 1019.8 1026.8 1029.6 ****** DAY 13 15 12 14 ** 23 12 23 28 17 27 18 MIN. QFF PRESSURE IN HPA 1009.2 1008.2 1004.2 1002.7 ****** 992.3 990.6 995.8 998.6 1011.4 1010.0 1010.7 ****** DAY 26 21 7 10 ** 12 14 6 8 5 5 2 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.2 918.4 914.6 914.3 911.0 909.8 907.2 908.8 914.2 918.2 919.9 917.3 914.3 MAX. QFE PRESSURE IN HPA 926.0 928.9 920.3 919.7 918.4 915.0 911.1 912.5 920.4 922.0 924.5 925.4 928.9 DAY 13 15 12 14 25 23 12 23 27 13 24 17 MIN. QFE PRESSURE IN HPA 908.4 909.5 905.2 905.8 906.1 902.3 901.6 904.2 906.8 914.6 912.9 912.2 901.6 DAY 26 21 7 10 23 12 14 12 8 15 5 1 MEAN QNH PRESSURE IN HPA 1019.5 1019.7 1015.6 1015.2 1011.7 1010.3 1007.5 1009.3 1015.1 1019.5 1021.4 1018.5 1015.3 MAX. QNH PRESSURE IN HPA 1028.0 1031.2 1021.8 1021.1 1019.7 1016.0 1011.8 1013.3 1021.9 1023.6 1026.4 1027.3 1031.2 DAY 13 15 12 14 25 23 12 23 27 13 24 17 MIN. QNH PRESSURE IN HPA 1008.8 1010.0 1005.4 1006.0 1006.3 1002.2 1001.4 1004.3 1007.1 1015.6 1013.7 1013.0 1001.4 DAY 26 21 7 10 23 12 14 12 8 15 5 1 MEAN QFF PRESSURE IN HPA 1021.9 1022.0 1015.4 1012.1 1007.0 1003.5 999.7 1002.4 1010.0 1016.8 1021.4 1021.0 1012.8 MAX. QFF PRESSURE IN HPA 1031.2 1036.1 1023.9 1020.6 1018.4 1008.5 1004.6 1007.3 1018.5 1020.8 1028.4 1031.2 1036.1 DAY 13 15 12 14 25 23 12 23 27 17 27 17 MIN. QFF PRESSURE IN HPA 1010.3 1009.4 1005.7 1002.9 1000.6 994.3 993.6 997.2 1000.6 1012.8 1011.8 1013.6 993.6 DAY 26 21 7 10 22 12 14 6 8 4 5 1 ======================================================================================================================= 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 PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 919.3 919.5 915.8 915.2 911.6 910.3 907.8 909.7 915.2 919.5 921.1 918.3 915.3 MAX. QFE PRESSURE IN HPA 927.0 930.5 923.0 920.8 918.4 916.1 911.4 913.5 921.7 923.3 926.0 927.1 930.5 DAY 12 15 12 19 25 23 12 23 27 13 24 17 MIN. QFE PRESSURE IN HPA 910.8 911.5 906.7 907.6 906.7 902.8 902.8 905.0 907.0 915.5 914.5 912.7 902.8 DAY 25 21 7 10 28 12 14 6 8 4 4 1 MEAN QNH PRESSURE IN HPA 1020.7 1020.9 1016.8 1016.2 1012.4 1010.9 1008.2 1010.2 1016.2 1020.9 1022.7 1019.6 1016.3 MAX. QNH PRESSURE IN HPA 1029.1 1032.9 1024.7 1022.3 1019.7 1017.2 1012.1 1014.4 1023.3 1025.1 1028.0 1029.2 1032.9 DAY 12 15 12 19 25 23 12 23 27 13 24 17 MIN. QNH PRESSURE IN HPA 1011.5 1012.2 1007.0 1008.0 1007.0 1002.7 1002.7 1005.1 1007.3 1016.6 1015.5 1013.5 1002.7 DAY 25 21 7 10 28 12 14 6 8 4 4 1 MEAN QFF PRESSURE IN HPA 1023.2 1023.2 1016.4 1012.6 ****** 1003.7 1000.0 1002.9 1010.5 1017.6 1022.4 1022.1 ****** MAX. QFF PRESSURE IN HPA 1032.7 1037.4 1026.8 1020.5 ****** 1009.6 1005.1 1007.6 1019.6 1021.8 1029.9 1033.0 ****** DAY 12 15 12 14 ** 23 12 27 27 13 27 17 MIN. QFF PRESSURE IN HPA 1012.9 1012.3 1007.3 1003.9 ****** 994.4 994.7 996.5 1000.7 1012.6 1013.2 1013.6 ****** DAY 25 21 7 10 ** 12 14 6 8 4 5 1 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.2 918.6 914.7 913.7 910.0 908.8 906.4 908.3 913.6 918.0 919.5 916.9 913.9 MAX. QFE PRESSURE IN HPA 925.8 930.1 922.5 919.3 917.5 914.9 909.9 912.1 919.8 921.7 924.3 925.2 930.1 DAY 12 15 12 14 25 23 11 23 27 13 27 17 MIN. QFE PRESSURE IN HPA 909.0 911.3 905.1 906.6 904.4 901.2 901.8 903.9 906.0 913.8 912.4 910.4 901.2 DAY 25 20 6 10 22 11 14 12 8 4 4 1 MEAN QNH PRESSURE IN HPA 1019.5 1020.0 1015.7 1014.6 1010.6 1009.3 1006.6 1008.7 1014.5 1019.3 1020.9 1018.1 1014.8 MAX. QNH PRESSURE IN HPA 1027.8 1032.5 1024.2 1020.7 1018.7 1015.9 1010.5 1012.9 1021.2 1023.3 1026.1 1027.1 1032.5 DAY 12 15 12 14 25 23 11 23 27 13 27 17 MIN. QNH PRESSURE IN HPA 1009.5 1012.0 1005.2 1006.9 1004.5 1001.0 1001.6 1003.9 1006.2 1014.7 1013.2 1011.0 1001.0 DAY 25 20 6 10 22 11 14 12 8 4 4 1 MEAN QFF PRESSURE IN HPA 1021.2 1021.7 1014.9 1010.8 ****** 1002.1 998.4 1001.3 1008.5 1015.5 1019.9 1019.8 ****** MAX. QFF PRESSURE IN HPA 1030.3 1035.8 1025.8 1018.8 ****** 1008.6 1003.0 1006.1 1017.6 1019.4 1026.7 1030.1 ****** DAY 12 15 12 14 ** 23 12 23 30 13 27 17 MIN. QFF PRESSURE IN HPA 1010.4 1011.6 1005.0 1003.0 ****** 992.3 993.5 996.0 998.8 1010.4 1010.5 1010.1 ****** DAY 25 20 6 10 ** 12 14 6 8 4 4 1 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 916.5 916.9 913.2 911.8 908.1 906.8 904.1 906.1 911.4 916.1 917.7 915.6 912.0 MAX. QFE PRESSURE IN HPA 924.0 928.5 920.4 917.2 915.0 913.0 908.0 910.0 917.9 920.1 922.7 923.6 928.5 DAY 12 15 12 14 25 23 11 23 27 13 24 17 MIN. QFE PRESSURE IN HPA 906.6 909.0 904.2 904.8 902.0 898.6 900.0 901.4 904.0 911.8 911.0 908.9 898.6 DAY 24 20 6 4 22 11 7 11 8 4 4 1 MEAN QNH PRESSURE IN HPA 1017.6 1018.1 1014.1 1012.5 1008.5 1007.1 1004.2 1006.3 1012.1 1017.2 1019.0 1016.7 1012.8 MAX. QNH PRESSURE IN HPA 1025.8 1030.7 1021.9 1018.4 1016.0 1013.8 1008.4 1010.6 1019.2 1021.6 1024.4 1025.4 1030.7 DAY 12 15 12 14 25 23 11 23 27 13 24 17 MIN. QNH PRESSURE IN HPA 1006.9 1009.5 1004.3 1004.9 1001.9 998.2 999.7 1001.2 1004.0 1012.5 1011.7 1009.4 998.2 DAY 24 20 6 4 22 11 7 11 8 4 4 1 MEAN QFF PRESSURE IN HPA 1019.3 1019.7 1013.3 1008.9 ****** 1000.0 996.0 998.9 1006.2 1013.6 1018.0 1018.3 ****** MAX. QFF PRESSURE IN HPA 1028.0 1034.3 1023.1 1016.8 ****** 1006.8 1000.8 1003.9 1015.6 1018.5 1025.2 1028.2 ****** DAY 12 15 12 14 ** 23 11 23 27 13 27 17 MIN. QFF PRESSURE IN HPA 1007.1 1009.1 1003.7 1001.5 ****** 991.3 991.4 993.6 996.3 1008.3 1008.1 1009.1 ****** DAY 24 20 6 4 ** 11 7 6 8 4 5 1 ======================================================================================================================= 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 PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 917.1 917.2 913.3 911.7 907.9 906.0 903.3 905.3 911.1 916.2 918.0 916.2 911.9 MAX. QFE PRESSURE IN HPA 924.0 927.7 920.4 916.9 914.2 912.0 907.3 909.0 917.5 920.4 922.5 925.2 927.7 DAY 11 15 12 14 24 23 11 27 27 20 27 17 MIN. QFE PRESSURE IN HPA 906.4 909.0 904.0 904.8 901.0 897.6 899.2 900.8 904.0 912.8 911.7 909.6 897.6 DAY 24 20 6 4 22 11 13 11 8 4 5 12 MEAN QNH PRESSURE IN HPA 1018.3 1018.4 1014.1 1012.4 1008.3 1006.3 1003.3 1005.4 1011.7 1017.3 1019.3 1017.3 1012.7 MAX. QNH PRESSURE IN HPA 1025.8 1029.8 1021.9 1018.1 1015.2 1012.8 1007.6 1009.5 1018.7 1021.9 1024.2 1027.1 1029.8 DAY 11 15 12 14 24 23 11 27 27 20 27 17 MIN. QNH PRESSURE IN HPA 1006.7 1009.5 1004.0 1004.9 1000.8 997.1 998.8 1000.6 1004.0 1013.6 1012.4 1010.1 997.1 DAY 24 20 6 4 22 11 13 11 8 4 5 12 MEAN QFF PRESSURE IN HPA 1020.6 1020.7 1013.9 1009.3 1003.6 999.4 995.5 998.6 1006.6 1014.6 1019.3 1019.8 1010.2 MAX. QFF PRESSURE IN HPA 1028.9 1034.2 1023.6 1017.0 1012.7 1005.7 1000.1 1003.9 1015.8 1019.5 1026.3 1031.0 1034.2 DAY 11 15 12 14 24 23 11 27 27 21 27 17 MIN. QFF PRESSURE IN HPA 1007.9 1010.1 1003.7 1002.3 995.6 989.8 991.0 993.0 997.4 1010.3 1010.5 1010.4 989.8 DAY 24 20 6 4 22 11 13 6 8 4 5 4 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 917.9 918.0 914.2 913.3 ****** 907.5 904.6 906.7 912.7 917.2 919.1 916.9 ****** MAX. QFE PRESSURE IN HPA 925.8 928.0 920.4 918.4 ****** 912.8 909.1 910.6 918.8 921.0 923.4 925.2 ****** DAY 12 15 12 14 ** 22 11 27 27 20 23 17 MIN. QFE PRESSURE IN HPA 908.6 909.0 904.4 906.8 ****** 900.2 898.8 902.0 905.5 914.3 913.0 910.0 ****** DAY 25 20 6 9 ** 11 13 6 7 3 4 4 MEAN QNH PRESSURE IN HPA 1019.2 1019.3 1015.1 1014.2 ****** 1007.8 1004.7 1007.0 1013.6 1018.5 1020.4 1018.1 ****** MAX. QNH PRESSURE IN HPA 1027.8 1030.2 1021.9 1019.7 ****** 1013.6 1009.6 1011.2 1020.2 1022.6 1025.2 1027.1 ****** DAY 12 15 12 14 ** 22 11 27 27 20 23 17 MIN. QNH PRESSURE IN HPA 1009.1 1009.5 1004.5 1007.1 ****** 999.9 998.4 1001.9 1005.7 1015.3 1013.8 1010.6 ****** DAY 25 20 6 9 ** 11 13 6 7 3 4 4 MEAN QFF PRESSURE IN HPA 1021.6 1021.5 1014.6 1010.5 ****** 1000.6 996.5 999.7 1007.8 1015.1 1020.2 1020.6 ****** MAX. QFF PRESSURE IN HPA 1031.1 1034.2 1023.1 1018.0 ****** 1005.7 1002.1 1004.9 1016.7 1019.4 1026.8 1031.0 ****** DAY 12 15 12 14 ** 22 11 27 27 16 27 17 MIN. QFF PRESSURE IN HPA 1010.7 1009.5 1004.7 1003.3 ****** 991.9 990.7 993.2 999.0 1011.2 1011.3 1010.6 ****** DAY 25 20 6 9 ** 11 13 6 7 4 5 4 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 917.9 917.9 914.2 913.4 ****** 907.9 904.9 907.3 913.1 917.4 919.2 917.0 ****** MAX. QFE PRESSURE IN HPA 926.0 927.6 920.0 918.4 ****** 913.0 909.8 911.0 919.2 920.8 923.8 925.2 ****** DAY 12 15 11 14 ** 22 11 22 26 16 24 17 MIN. QFE PRESSURE IN HPA 908.6 909.0 904.4 906.2 ****** 900.4 898.8 903.1 906.0 914.2 913.0 908.6 ****** DAY 25 20 6 9 ** 11 13 11 7 3 4 31 MEAN QNH PRESSURE IN HPA 1019.2 1019.2 1015.1 1014.3 ****** 1008.3 1005.0 1007.6 1013.9 1018.6 1020.6 1018.2 ****** MAX. QNH PRESSURE IN HPA 1028.0 1029.7 1021.5 1019.7 ****** 1013.8 1010.4 1011.7 1020.6 1022.3 1025.6 1027.1 ****** DAY 12 15 11 14 ** 22 11 22 26 16 24 17 MIN. QNH PRESSURE IN HPA 1009.1 1009.5 1004.5 1006.4 ****** 1000.1 998.4 1003.1 1006.2 1015.2 1013.8 1009.1 ****** DAY 25 20 6 9 ** 11 13 11 7 3 4 31 MEAN QFF PRESSURE IN HPA 1020.9 1020.8 1014.2 1010.4 ****** 1001.0 996.7 1000.2 1008.0 1014.8 1019.7 1019.9 ****** MAX. QFF PRESSURE IN HPA 1030.3 1033.3 1023.0 1017.9 ****** 1006.3 1003.1 1005.3 1016.3 1019.9 1026.4 1030.6 ****** DAY 12 15 11 14 ** 23 11 27 29 16 24 17 MIN. QFF PRESSURE IN HPA 1010.0 1008.3 1004.6 1002.2 ****** 991.7 990.4 994.9 999.0 1011.1 1010.4 1011.8 ****** DAY 24 20 6 9 ** 11 13 6 7 3 5 1 ======================================================================================================================= 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 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 0.8 4.5 6.9 16.4 19.3 27.9 32.4 28.5 23.0 17.5 10.9 4.9 16.1 MINIMUN AIR TEMPERATURE (C) -4.1 -1.8 0.9 9.3 13.0 19.1 22.1 19.6 11.9 8.2 3.4 -0.6 8.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 7 21 9 0 0 0 0 37 DAYS WITH MINIMUM TEMP. <=-4 15 8 6 0 0 0 0 0 0 0 4 4 37 DAYS WITH FREEZING MIN.<= 0 28 24 12 0 0 0 0 0 0 0 6 17 87 TEMPERATURE RECORDS LOWEST(C) -12.0 -8.6 -11.0 4.0 5.4 15.0 16.5 15.0 8.0 3.0 -7.0 -10.5 -12.0 DAY 29 17 11 1 5 5 27 21 27 30 28 29 MAXIMUM AIR TEMPERATURE (C) 7.2 12.0 13.6 23.7 26.0 35.7 40.6 36.4 32.9 27.4 20.0 11.2 23.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 3 9 30 31 30 28 6 0 0 137 DAYS WITH MAXIMUM TEMP. <= 0 1 0 0 0 0 0 0 0 0 0 0 1 2 TEMPERATURE RECORDS HIGHEST(C) 13.0 20.0 23.0 31.0 34.4 41.2 44.0 41.0 38.0 32.0 26.0 17.0 44.0 DAY 19 21 29 22 30 30 5 1 25 4 2 1 DIF. BETWEEN (MAX.-MIN.) (C) 11.3 13.8 12.7 14.4 13.0 16.6 18.5 16.8 21.0 19.2 16.6 11.8 15.5 MEAN DAILY TEMP. (MDT) (C) 1.6 5.1 7.3 16.5 19.5 27.4 31.4 28.0 22.4 17.8 11.7 5.3 16.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 4.6 32.9 192.7 321.8 217.0 47.8 0.8 0.0 0.0 817.8 HEATING DEG. DAYS(BASE 18 0C) 509.7 373.5 332.6 65.4 38.9 0.0 0.0 0.0 0.0 32.0 188.3 393.9 1934.5 DEWPOINT (MEAN C) -4.8 -5.1 -1.6 2.8 6.8 6.2 5.4 5.7 0.3 -1.3 -1.3 -1.9 0.9 MIXING RATIO (G/KG) 3.00 2.99 4.01 5.39 7.05 6.76 6.57 6.53 4.41 3.90 4.07 3.78 4.87 VAPOUR PRESSURE (HPA) 4.40 4.37 5.85 7.83 10.23 9.76 9.46 9.46 6.44 5.70 5.97 5.53 7.08 SATURATION DEF. (HPA) 2.41 4.59 4.82 11.98 13.71 29.72 41.73 31.63 23.88 15.93 8.21 3.55 16.01 RELATIVE HUMIDITY (MEAN %) 69 54 59 46 51 29 22 26 26 31 47 65 44 RELATIVE HUMIDITY (MAX. %) 86 77 84 69 76 48 42 43 44 50 68 83 64 RELATIVE HUMIDITY (MIN. %) 46 28 36 26 30 15 10 15 12 16 25 44 25 RELATIVE HUMIDITY (MEAN% 03UTC) 80 73 79 66 70 46 40 42 44 49 65 79 61 RELATIVE HUMIDITY (MEAN% 09UTC) 56 36 45 31 37 19 16 19 16 19 31 50 31 RELATIVE HUMIDITY (MEAN% 15UTC) 64 45 51 36 37 19 10 16 15 21 37 57 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 11.4 21.2 61.6 30.2 45.8 4.4 0.0 0.0 0.0 0.0 2.0 8.5 185.1 DAYS WITH PRECIPITATION >=10 0 1 1 1 1 0 0 0 0 0 0 0 4 DAYS WITH PRECIPITATION >= 5 1 1 5 2 3 0 0 0 0 0 0 1 13 DAYS WITH PRECIPITATION >= 1 4 2 7 4 8 1 0 0 0 0 1 2 29 DAYS WITH PRECIPITATION 8 4 9 7 12 2 0 0 0 0 1 5 48 GREATEST DAILY PRECIPITATION 6.0 18.0 26.0 15.2 15.3 4.0 0.0 0.0 0.0 0.0 2.0 5.0 26.0 DAY 3 25 9 27 6 4 ** ** ** ** 8 30 DAY WITH THUNDER STORM 0 0 0 1 5 1 0 0 0 0 0 0 7 DAYS WITH SNOW OR SLEET 5 0 2 0 0 0 0 0 0 0 0 1 8 DAYS WITH DUST 0 4 2 3 2 0 2 2 0 0 2 2 19 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 7.8 11.3 11.2 9.9 9.8 10.5 10.3 10.8 8.3 6.5 6.7 6.5 9.3 PREVAILING WIND PERCENT 27.0 27.6 30.6 27.9 15.3 23.3 31.5 37.9 17.9 14.5 14.2 10.5 17.3 CALMS PERCENT OF WIND 56.0 39.7 44.4 30.8 44.0 40.0 40.7 44.0 54.2 59.1 61.3 71.8 48.9 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 242 240 248 2922 VECTOR WIND DIRECTION (MEAN) 283 284 283 293 301 295 84 85 70 300 281 294 302 VECTOR WIND MAGNITUDE(KNOTS) 2.7 5.5 4.3 4.8 2.1 1.9 3.6 4.5 0.6 0.5 1.1 0.9 1.3 WIND STEADINESES (MEAN %) 81.8 82.1 72.9 65.8 41.2 31.1 62.1 81.8 16.7 17.2 42.3 42.9 27.1 WIND SPEED (MEAN KNOTS) 3.3 6.7 5.9 7.3 5.1 6.1 5.8 5.5 3.6 2.9 2.6 2.1 4.8 FASTEST WIND DIRECTION 300 300 270 280 270 270 110 100 320 310 300 300 300 FASTEST WIND SPEED (KNOTS) 19 29 29 29 29 27 23 23 19 19 29 25 29 DAY 23 11 6 21 19 1 18 18 18 24 26 28 DAYS WITH SKY CLEAR (0-2)/8 13 11 14 10 11 23 30 28 29 30 16 10 225 DAYS WITH P.CLOUDY (3-6)/8 12 13 12 18 15 6 1 3 1 1 11 12 105 DAYS WITH CLOUDY (7-8)/8 6 5 5 2 5 1 0 0 0 0 3 9 36 DAYS WITH VISIBILITY =< 2 KM 0 0 2 0 1 0 0 0 0 0 1 1 5 DURATION OF SUNSHINE HOURS 157.4 184.2 220.6 215.5 234.8 323.1 362.3 327.6 320.1 297.7 192.2 137.3 2972.8 ======================================================================================================================= 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 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 917.9 914.0 915.4 911.9 913.4 908.1 906.2 910.1 913.8 916.5 918.4 917.7 913.6 MAX. QFE PRESSURE IN HPA 929.4 923.7 928.5 917.7 921.0 914.9 912.2 920.0 920.0 923.1 928.2 924.1 929.4 DAY-HOUR 10- 6 16- 6 12- 6 20- 6 2- 9 11- 3 14- 6 31- 6 1- 6 30- 6 4- 6 29- 6 MIN. QFE PRESSURE IN HPA 907.1 902.8 901.4 903.0 907.3 900.1 900.0 900.9 906.5 909.9 906.6 912.1 900.0 DAY-HOUR 2-21 24-15 30-12 18- 0 20-15 27-15 18-15 1-15 17-15 5-15 25-21 27-12 MEAN QNH PRESSURE IN HPA 1019.1 1014.9 1016.5 1012.6 1014.3 1008.5 1006.5 1010.7 1014.7 1017.6 1019.7 1018.9 1014.5 MAX. QNH PRESSURE IN HPA 1031.7 1025.5 1030.7 1019.0 1022.6 1015.9 1013.0 1021.5 1021.5 1024.8 1030.4 1025.9 1031.7 DAY-HOUR 10- 6 16- 6 12- 6 20- 6 2- 9 11- 3 14- 6 31- 6 1- 6 30- 6 4- 6 29- 6 MIN. QNH PRESSURE IN HPA 1007.4 1002.7 1001.2 1003.0 1007.6 999.8 999.7 1000.7 1006.8 1010.5 1006.9 1012.9 999.7 DAY-HOUR 2-21 24-15 30-12 18- 0 20-15 27-15 18-15 1-15 17-15 5-15 25-21 27-12 MEAN QFF PRESSURE IN HPA 1022.5 1016.7 1017.4 1009.9 1010.5 1001.8 998.2 1003.7 1009.8 1014.6 1019.2 1020.6 1012.1 MAX. QFF PRESSURE IN HPA 1037.1 1029.2 1035.6 1018.8 1022.5 1009.7 1005.3 1016.3 1017.9 1023.5 1030.1 1031.7 1037.1 DAY-HOUR 10- 6 16- 6 12- 6 8- 3 2-18 11- 3 14- 3 31- 6 30- 6 30- 6 4- 6 29- 6 MIN. QFF PRESSURE IN HPA 1009.0 1002.5 998.7 998.9 1002.7 992.1 991.3 992.6 1002.2 1006.5 1004.4 1014.3 991.3 DAY-HOUR 2-21 24-12 30-12 18- 0 20-15 27-15 18-15 1-15 17-15 5-12 25-21 27-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 917.7 914.0 915.3 911.8 913.5 908.6 906.2 910.1 913.8 916.6 918.2 917.6 913.6 MAX. QFE PRESSURE IN HPA 928.6 922.5 925.7 916.5 918.7 914.0 910.4 917.4 918.5 921.9 925.6 923.2 928.6 DAY 5 16 12 8 3 7 14 31 2 30 4 29 MIN. QFE PRESSURE IN HPA 908.3 906.9 904.3 903.0 909.2 901.8 902.4 902.5 909.0 912.4 906.9 914.2 901.8 DAY 3 25 31 18 10 27 20 1 18 6 26 28 MEAN QNH PRESSURE IN HPA 1018.9 1014.9 1016.4 1012.5 1014.4 1009.0 1006.4 1010.6 1014.8 1017.7 1019.5 1018.8 1014.5 MAX. QNH PRESSURE IN HPA 1030.8 1024.2 1027.7 1017.7 1020.1 1014.9 1011.0 1018.6 1019.8 1023.5 1027.6 1024.9 1030.8 DAY 5 16 12 8 3 7 14 31 2 30 4 29 MIN. QNH PRESSURE IN HPA 1008.7 1007.2 1004.4 1003.0 1009.7 1001.6 1002.3 1002.4 1009.5 1013.2 1007.2 1015.2 1001.6 DAY 3 25 31 18 10 27 20 1 18 6 26 28 MEAN QFF PRESSURE IN HPA 1021.9 1016.3 1017.1 1009.7 1010.4 1002.2 998.2 1003.5 1009.6 1014.4 1018.4 1020.1 1011.8 MAX. QFF PRESSURE IN HPA 1035.4 1026.7 1031.9 1017.4 1019.7 1008.5 1003.8 1013.2 1015.6 1021.3 1026.6 1029.5 1035.4 DAY 5 16 12 8 3 7 14 31 2 30 4 29 MIN. QFF PRESSURE IN HPA 1010.2 1006.6 1002.6 998.9 1005.0 993.7 993.6 994.0 1003.7 1008.2 1005.0 1016.5 993.6 DAY 3 25 31 18 19 27 19 1 18 6 26 28 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 917.8 914.5 915.9 912.7 914.3 909.5 907.8 911.6 915.0 917.4 918.9 917.9 914.4 MAX. QFE PRESSURE IN HPA 928.1 923.1 926.9 917.2 919.4 914.9 911.6 918.8 919.0 922.4 926.2 923.2 928.1 DAY 10 16 12 20 2 11 14 31 1 30 4 29 MIN. QFE PRESSURE IN HPA 908.9 908.0 903.5 904.6 909.7 902.8 904.2 904.8 910.0 913.8 908.4 914.7 902.8 DAY 3 21 31 18 10 27 10 1 18 6 25 27 MEAN QNH PRESSURE IN HPA 1019.1 1015.4 1017.0 1013.5 1015.3 1010.1 1008.2 1012.3 1016.1 1018.7 1020.2 1019.2 1015.4 MAX. QNH PRESSURE IN HPA 1030.3 1024.8 1029.0 1018.4 1020.8 1015.9 1012.3 1020.2 1020.4 1024.1 1028.2 1024.9 1030.3 DAY 10 16 12 20 2 11 14 31 1 30 4 29 MIN. QNH PRESSURE IN HPA 1009.4 1008.4 1003.5 1004.7 1010.2 1002.7 1004.3 1004.9 1010.6 1014.7 1008.8 1015.7 1002.7 DAY 3 21 31 18 10 27 10 1 18 6 25 27 MEAN QFF PRESSURE IN HPA 1022.9 1017.8 1018.4 1011.3 1011.7 1003.7 1000.2 1005.6 1011.8 1016.3 1020.3 1021.4 1013.4 MAX. QFF PRESSURE IN HPA 1035.7 1029.0 1034.3 1018.8 1020.2 1009.7 1005.3 1015.4 1016.7 1023.2 1028.2 1030.9 1035.7 DAY 10 16 12 8 2 11 14 31 30 30 4 29 MIN. QFF PRESSURE IN HPA 1011.4 1009.5 1002.2 1001.1 1006.6 995.1 996.3 996.4 1005.6 1009.9 1008.2 1017.5 995.1 DAY 3 25 31 18 10 27 19 1 18 6 25 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 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 919.1 915.4 917.0 913.6 914.9 909.9 908.6 912.5 916.0 918.6 920.2 919.1 915.4 MAX. QFE PRESSURE IN HPA 929.4 923.7 928.5 917.7 920.5 914.9 912.2 920.0 920.0 923.1 928.2 924.1 929.4 DAY 10 16 12 20 2 11 14 31 1 30 4 29 MIN. QFE PRESSURE IN HPA 911.5 909.3 905.0 905.8 909.8 903.0 904.8 906.0 911.1 915.0 910.2 915.3 903.0 DAY 3 25 31 18 4 27 10 1 18 5 25 27 MEAN QNH PRESSURE IN HPA 1020.5 1016.4 1018.2 1014.5 1015.9 1010.4 1009.0 1013.3 1017.1 1019.9 1021.6 1020.5 1016.5 MAX. QNH PRESSURE IN HPA 1031.7 1025.5 1030.7 1019.0 1022.0 1015.9 1013.0 1021.5 1021.5 1024.8 1030.4 1025.9 1031.7 DAY 10 16 12 20 2 11 14 31 1 30 4 29 MIN. QNH PRESSURE IN HPA 1012.2 1009.8 1005.1 1006.0 1010.4 1003.0 1004.9 1006.2 1011.8 1016.0 1010.8 1016.3 1003.0 DAY 3 25 31 18 4 27 10 1 18 5 25 27 MEAN QFF PRESSURE IN HPA 1024.4 1018.7 1019.4 1011.8 1012.2 1003.7 1000.7 1006.3 1012.1 1017.1 1021.4 1022.5 1014.2 MAX. QFF PRESSURE IN HPA 1037.1 1029.2 1035.6 1018.1 1022.0 1009.3 1005.3 1016.3 1017.9 1023.5 1030.1 1031.7 1037.1 DAY 10 16 12 8 2 7 12 31 30 30 4 29 MIN. QFF PRESSURE IN HPA 1014.4 1010.6 1004.4 1002.4 1006.9 994.9 996.6 998.1 1006.1 1012.0 1009.8 1017.8 994.9 DAY 3 25 31 18 19 27 18 1 18 5 25 4 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.1 914.2 916.0 912.3 913.9 908.5 907.1 911.0 914.3 916.8 918.5 917.8 914.0 MAX. QFE PRESSURE IN HPA 928.5 922.1 927.8 916.4 921.0 914.0 910.4 918.0 918.7 921.5 926.6 922.0 928.5 DAY 10 16 12 8 2 11 14 31 1 30 4 29 MIN. QFE PRESSURE IN HPA 911.6 906.7 904.5 905.5 908.4 902.4 903.0 904.0 910.0 912.7 907.9 912.9 902.4 DAY 2 24 31 18 4 27 10 1 17 5 25 27 MEAN QNH PRESSURE IN HPA 1019.4 1015.2 1017.1 1013.0 1014.8 1008.9 1007.4 1011.7 1015.2 1018.0 1019.9 1019.1 1015.0 MAX. QNH PRESSURE IN HPA 1030.7 1023.8 1030.0 1017.5 1022.6 1014.9 1011.0 1019.3 1020.1 1023.1 1028.6 1023.6 1030.7 DAY 10 16 12 8 2 11 14 31 1 30 4 29 MIN. QNH PRESSURE IN HPA 1012.3 1007.0 1004.6 1005.7 1008.8 1002.3 1003.0 1004.0 1010.6 1013.5 1008.3 1013.7 1002.3 DAY 2 24 31 18 4 27 10 1 17 5 25 27 MEAN QFF PRESSURE IN HPA 1022.4 1016.6 1017.7 1010.1 1010.9 1002.0 999.0 1004.6 1010.0 1014.6 1018.8 1020.5 1012.3 MAX. QFF PRESSURE IN HPA 1035.0 1026.0 1034.1 1016.1 1022.3 1008.2 1003.5 1014.0 1015.8 1021.1 1027.6 1028.1 1035.0 DAY 10 16 12 3 2 11 12 31 30 30 4 29 MIN. QFF PRESSURE IN HPA 1013.6 1006.1 1002.7 1002.2 1004.6 994.1 994.3 996.0 1005.0 1008.9 1005.5 1014.8 994.1 DAY 17 24 30 18 31 27 10 1 18 5 25 27 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 916.8 912.6 914.1 910.4 912.2 906.6 905.0 908.7 912.3 914.9 917.1 916.4 912.2 MAX. QFE PRESSURE IN HPA 926.7 919.8 926.1 914.6 919.4 911.6 908.6 916.2 917.0 919.8 924.0 920.6 926.7 DAY 10 16 12 8 2 10 14 31 1 29 4 28 MIN. QFE PRESSURE IN HPA 909.1 903.5 901.4 905.4 907.4 900.5 900.9 902.0 907.4 910.3 907.7 912.1 900.5 DAY 2 24 30 17 4 27 18 1 17 5 25 27 MEAN QNH PRESSURE IN HPA 1018.0 1013.4 1015.0 1011.0 1012.9 1006.8 1005.1 1009.2 1013.0 1015.9 1018.3 1017.5 1013.0 MAX. QNH PRESSURE IN HPA 1028.8 1021.2 1028.1 1015.6 1020.8 1012.3 1009.1 1017.3 1018.2 1021.2 1025.8 1022.1 1028.8 DAY 10 16 12 8 2 10 14 31 1 29 4 28 MIN. QNH PRESSURE IN HPA 1009.6 1003.5 1001.2 1005.6 1007.7 1000.2 1000.7 1001.9 1007.7 1010.9 1008.1 1012.9 1000.2 DAY 2 24 30 17 4 27 18 1 17 5 25 27 MEAN QFF PRESSURE IN HPA 1020.8 1014.7 1015.7 1008.2 1009.0 1000.0 996.9 1002.1 1007.9 1012.5 1017.3 1018.8 1010.3 MAX. QFF PRESSURE IN HPA 1032.8 1023.5 1031.9 1014.0 1020.5 1006.1 1001.8 1012.2 1013.7 1018.9 1024.9 1025.9 1032.8 DAY 10 16 12 7 2 7 14 31 1 30 4 29 MIN. QFF PRESSURE IN HPA 1011.7 1002.5 998.7 1000.2 1002.9 992.2 992.5 993.7 1002.4 1006.5 1006.1 1014.3 992.2 DAY 2 24 30 22 23 27 19 1 17 5 25 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 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 917.5 913.0 914.2 910.5 912.0 906.2 904.2 908.0 912.0 914.8 917.7 917.2 912.3 MAX. QFE PRESSURE IN HPA 927.8 920.4 925.4 914.0 920.6 911.4 908.0 915.6 916.5 920.4 924.0 922.8 927.8 DAY 9 15 12 2 2 10 14 31 1 29 3 28 MIN. QFE PRESSURE IN HPA 908.1 902.8 902.2 904.8 907.3 900.1 900.0 900.9 906.5 909.9 907.9 912.5 900.0 DAY 2 24 30 17 20 27 18 1 17 5 25 19 MEAN QNH PRESSURE IN HPA 1018.7 1013.9 1015.1 1011.1 1012.7 1006.5 1004.3 1008.4 1012.8 1015.8 1018.9 1018.4 1013.1 MAX. QNH PRESSURE IN HPA 1030.0 1021.9 1027.3 1014.9 1022.1 1012.1 1008.4 1016.7 1017.7 1021.9 1025.8 1024.5 1030.0 DAY 9 15 12 2 2 10 14 31 1 29 3 28 MIN. QNH PRESSURE IN HPA 1008.5 1002.7 1002.1 1004.9 1007.6 999.8 999.7 1000.7 1006.8 1010.5 1008.3 1013.3 999.7 DAY 2 24 30 17 20 27 18 1 17 5 25 19 MEAN QFF PRESSURE IN HPA 1022.4 1016.2 1016.4 1008.8 1009.1 1000.1 996.4 1001.8 1008.5 1013.5 1019.0 1020.6 1011.1 MAX. QFF PRESSURE IN HPA 1034.9 1025.1 1032.1 1015.4 1022.1 1006.5 1001.4 1012.1 1014.5 1020.2 1025.5 1029.0 1034.9 DAY 9 15 12 2 2 8 14 31 30 30 4 28 MIN. QFF PRESSURE IN HPA 1011.2 1003.0 1001.1 1001.8 1002.7 992.1 991.3 992.6 1002.2 1007.0 1006.7 1015.3 991.3 DAY 2 24 30 22 20 27 18 1 17 5 25 19 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 918.1 914.1 915.5 911.9 913.4 907.6 905.1 909.3 913.3 916.2 918.5 917.8 913.4 MAX. QFE PRESSURE IN HPA 928.6 921.9 925.8 916.0 921.0 913.0 908.6 917.0 918.5 921.4 925.3 923.4 928.6 DAY 9 15 12 7 2 6 14 31 1 29 3 28 MIN. QFE PRESSURE IN HPA 907.3 903.6 905.4 906.2 907.8 901.9 900.7 903.0 908.0 910.9 907.2 914.5 900.7 DAY 2 24 30 17 9 24 18 1 17 5 25 19 MEAN QNH PRESSURE IN HPA 1019.4 1015.0 1016.6 1012.7 1014.2 1008.0 1005.3 1009.8 1014.2 1017.3 1019.8 1019.1 1014.3 MAX. QNH PRESSURE IN HPA 1030.8 1023.5 1027.8 1017.1 1022.6 1013.8 1009.1 1018.2 1019.8 1023.0 1027.2 1025.2 1030.8 DAY 9 15 12 7 2 6 14 31 1 29 3 28 MIN. QNH PRESSURE IN HPA 1007.6 1003.6 1005.6 1006.4 1008.2 1001.8 1000.5 1003.0 1008.4 1011.6 1007.5 1015.5 1000.5 DAY 2 24 30 17 9 24 18 1 17 5 25 19 MEAN QFF PRESSURE IN HPA 1023.3 1017.2 1017.6 1009.9 1010.5 1001.1 996.9 1002.8 1009.1 1014.4 1019.6 1021.1 1012.0 MAX. QFF PRESSURE IN HPA 1036.1 1026.3 1032.4 1017.0 1022.5 1008.4 1001.3 1013.0 1015.2 1021.0 1027.0 1029.5 1036.1 DAY 9 15 12 7 2 8 14 31 30 29 3 28 MIN. QFF PRESSURE IN HPA 1010.2 1003.8 1004.1 1003.2 1003.8 993.8 991.6 994.7 1003.1 1007.4 1005.9 1016.9 991.6 DAY 2 24 30 17 31 27 18 1 17 5 25 19 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 918.0 914.2 915.4 912.2 913.6 908.1 905.8 909.9 913.8 916.5 918.5 917.7 913.6 MAX. QFE PRESSURE IN HPA 928.6 922.2 925.3 917.0 920.4 914.0 909.8 917.3 918.5 921.8 925.6 923.1 928.6 DAY 4 15 12 7 2 6 14 31 1 29 3 28 MIN. QFE PRESSURE IN HPA 907.1 906.9 904.7 903.8 909.4 902.1 901.3 904.2 908.7 911.6 906.6 914.0 901.3 DAY 2 24 30 17 31 27 18 1 17 5 25 27 MEAN QNH PRESSURE IN HPA 1019.3 1015.2 1016.5 1013.0 1014.4 1008.5 1006.0 1010.5 1014.7 1017.7 1019.8 1019.0 1014.5 MAX. QNH PRESSURE IN HPA 1030.8 1023.9 1027.2 1018.2 1021.9 1014.9 1010.4 1018.5 1019.8 1023.4 1027.6 1024.8 1030.8 DAY 4 15 12 7 2 6 14 31 1 29 3 28 MIN. QNH PRESSURE IN HPA 1007.4 1007.2 1004.8 1003.8 1009.9 1002.0 1001.1 1004.3 1009.2 1012.3 1006.9 1014.9 1001.1 DAY 2 24 30 17 31 27 18 1 17 5 25 27 MEAN QFF PRESSURE IN HPA 1022.4 1016.6 1017.1 1009.9 1010.5 1001.6 997.6 1003.4 1009.4 1014.4 1018.8 1020.3 1011.8 MAX. QFF PRESSURE IN HPA 1035.4 1025.8 1031.2 1017.8 1021.7 1008.4 1002.6 1013.9 1015.7 1021.2 1026.2 1029.1 1035.4 DAY 4 15 11 7 2 6 14 31 30 29 3 28 MIN. QFF PRESSURE IN HPA 1009.0 1006.6 1002.5 999.8 1003.4 993.8 992.1 996.0 1003.8 1007.6 1004.4 1015.8 992.1 DAY 2 24 30 17 31 27 18 1 17 5 25 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 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 0.9 5.6 9.7 17.8 22.4 28.7 31.1 30.0 25.9 16.4 8.2 6.0 16.9 MINIMUN AIR TEMPERATURE (C) -3.7 0.4 3.1 10.4 14.5 18.8 21.8 20.7 15.5 7.9 2.6 0.1 9.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 7 21 16 1 0 0 0 47 DAYS WITH MINIMUM TEMP. <=-4 15 2 0 0 0 0 0 0 0 0 5 2 24 DAYS WITH FREEZING MIN.<= 0 27 15 6 0 0 0 0 0 0 0 9 17 74 TEMPERATURE RECORDS LOWEST(C) -12.6 -5.5 -3.0 5.6 9.0 14.2 19.0 16.0 11.0 0.6 -5.0 -4.4 -12.6 DAY 11 17 23 30 1 7 3 31 18 10 15 7 MAXIMUM AIR TEMPERATURE (C) 6.5 11.5 16.5 25.4 30.0 37.1 38.7 38.0 35.5 25.0 14.7 12.8 24.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 4 17 30 31 31 29 3 0 0 145 DAYS WITH MAXIMUM TEMP. <= 0 2 0 0 0 0 0 0 0 0 0 0 0 2 TEMPERATURE RECORDS HIGHEST(C) 17.0 20.0 26.0 33.6 36.0 41.6 43.0 42.0 40.0 35.0 22.0 20.0 43.0 DAY 29 28 30 19 17 29 3 14 2 1 11 28 DIF. BETWEEN (MAX.-MIN.) (C) 10.2 11.1 13.4 15.0 15.5 18.3 16.9 17.3 20.0 17.1 12.1 12.7 15.0 MEAN DAILY TEMP. (MDT) (C) 1.4 6.0 9.8 17.9 22.2 28.0 30.3 29.4 25.5 16.5 8.6 6.5 16.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 9.6 65.0 208.7 287.4 259.2 136.4 4.8 0.0 0.0 971.3 HEATING DEG. DAYS(BASE 18 0C) 514.6 336.2 253.3 33.6 3.0 0.0 0.0 0.0 0.0 63.2 281.6 357.3 1842.8 DEWPOINT (MEAN C) -3.8 0.0 -1.9 2.4 4.5 5.4 9.1 9.4 2.6 -1.0 1.5 -0.0 2.3 MIXING RATIO (G/KG) 3.24 4.34 3.92 5.24 6.16 6.38 8.17 8.34 5.24 4.14 4.98 4.21 5.36 VAPOUR PRESSURE (HPA) 4.76 6.34 5.72 7.62 8.94 9.22 11.77 12.03 7.62 6.07 7.28 6.18 7.80 SATURATION DEF. (HPA) 2.18 3.12 7.04 13.90 19.78 32.49 35.24 32.52 28.27 13.90 4.32 3.66 16.37 RELATIVE HUMIDITY (MEAN %) 74 71 51 42 37 26 27 30 25 35 66 69 46 RELATIVE HUMIDITY (MAX. %) 88 89 77 66 59 42 41 45 42 55 87 86 65 RELATIVE HUMIDITY (MIN. %) 54 46 27 20 18 14 18 20 13 18 43 44 28 RELATIVE HUMIDITY (MEAN% 03UTC) 83 85 72 60 54 41 39 43 40 49 83 83 61 RELATIVE HUMIDITY (MEAN% 09UTC) 60 56 33 28 23 18 21 23 16 21 49 52 33 RELATIVE HUMIDITY (MEAN% 15UTC) 72 62 38 29 26 16 18 22 16 30 58 60 37 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 45.0 64.8 26.3 11.0 12.4 0.0 0.0 0.0 0.0 2.8 25.0 6.2 193.5 DAYS WITH PRECIPITATION >=10 2 4 0 0 0 0 0 0 0 0 0 0 6 DAYS WITH PRECIPITATION >= 5 2 4 3 0 2 0 0 0 0 0 2 0 13 DAYS WITH PRECIPITATION >= 1 5 9 4 4 3 0 0 0 0 1 6 3 35 DAYS WITH PRECIPITATION 6 10 6 7 5 0 0 0 0 2 8 4 48 GREATEST DAILY PRECIPITATION 17.8 17.0 9.6 3.8 6.0 0.0 0.0 0.0 0.0 2.0 8.0 2.0 17.8 DAY 8 2 8 26 13 ** ** ** ** 28 27 1 DAY WITH THUNDER STORM 0 0 0 1 1 0 0 0 1 0 0 0 3 DAYS WITH SNOW OR SLEET 5 0 0 0 0 0 0 0 0 0 1 0 6 DAYS WITH DUST 0 0 0 2 0 1 0 0 0 0 2 1 6 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 90 90 270 270 270 PREVAILING WIND SPEED(KNOTS) 7.0 6.6 7.5 9.5 9.0 8.3 9.7 9.1 8.5 7.5 7.8 7.7 7.8 PREVAILING WIND PERCENT 22.2 20.1 17.7 24.2 29.8 16.7 39.1 35.9 20.8 14.1 10.8 8.1 14.7 CALMS PERCENT OF WIND 64.5 60.3 48.8 40.0 30.6 40.8 35.5 42.3 49.6 64.5 69.2 79.8 52.1 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 283 288 304 285 296 314 91 87 74 47 303 275 328 VECTOR WIND MAGNITUDE(KNOTS) 1.7 2.0 0.9 3.0 3.5 1.5 3.9 3.4 1.5 0.4 1.0 0.8 0.6 WIND STEADINESES (MEAN %) 70.8 71.4 22.5 52.6 54.7 27.8 68.4 69.4 37.5 16.0 45.5 61.5 15.4 WIND SPEED (MEAN KNOTS) 2.4 2.8 4.0 5.7 6.4 5.4 5.7 4.9 4.0 2.5 2.2 1.3 3.9 FASTEST WIND DIRECTION 270 330 270 300 280 280 90 30 300 280 270 320 270 FASTEST WIND SPEED (KNOTS) 19 19 39 23 29 23 19 29 19 17 29 16 39 DAY 18 5 22 13 13 5 2 9 15 1 14 10 DAYS WITH SKY CLEAR (0-2)/8 19 9 14 8 12 29 30 28 29 22 14 11 225 DAYS WITH P.CLOUDY (3-6)/8 3 12 11 16 14 1 1 3 1 9 10 15 96 DAYS WITH CLOUDY (7-8)/8 9 7 6 6 5 0 0 0 0 0 6 5 44 DAYS WITH VISIBILITY =< 2 KM 5 0 1 0 0 0 0 0 0 0 1 1 8 DURATION OF SUNSHINE HOURS 171.9 161.0 223.0 200.4 268.4 368.7 373.0 343.8 310.8 257.8 171.3 154.3 3004.4 ======================================================================================================================= 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 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 919.0 916.8 915.2 912.8 912.5 908.7 908.1 909.8 911.7 920.0 918.5 920.4 914.5 MAX. QFE PRESSURE IN HPA 928.6 925.1 923.2 921.1 921.0 919.6 915.5 915.5 920.5 927.0 927.0 927.3 928.6 DAY-HOUR 6- 6 9- 6 23- 6 1- 6 9- 6 23- 3 27- 6 25- 6 23- 6 17- 6 21- 6 26- 6 MIN. QFE PRESSURE IN HPA 909.6 907.0 907.0 904.8 907.9 902.1 901.6 902.2 904.6 910.7 905.5 912.7 901.6 DAY-HOUR 8-12 3-12 21-15 20-15 2-15 3-15 12-15 12-15 3-15 2-15 11-12 5-12 MEAN QNH PRESSURE IN HPA 1020.4 1018.0 1016.3 1013.6 1013.3 1009.1 1008.5 1010.3 1012.4 1021.5 1019.9 1021.9 1015.4 MAX. QNH PRESSURE IN HPA 1030.8 1027.0 1024.9 1022.7 1022.6 1021.0 1016.6 1016.6 1022.0 1029.1 1029.1 1029.4 1030.8 DAY-HOUR 6- 6 9- 6 23- 6 1- 6 9- 6 23- 3 27- 6 25- 6 23- 6 17- 6 21- 6 26- 6 MIN. QNH PRESSURE IN HPA 1010.1 1007.3 1007.3 1004.9 1008.3 1002.0 1001.4 1002.1 1004.7 1011.3 1005.7 1013.5 1001.4 DAY-HOUR 8-12 3-12 21-15 20-15 2-15 3-15 12-15 12-15 3-15 2-15 11-12 5-12 MEAN QFF PRESSURE IN HPA 1023.8 1019.5 1016.1 1010.3 1008.5 1002.2 1000.6 1002.8 1006.4 1019.0 1020.3 1023.3 1012.7 MAX. QFF PRESSURE IN HPA 1033.3 1029.6 1027.1 1020.3 1019.9 1015.4 1008.6 1009.9 1016.7 1026.8 1031.6 1031.6 1033.3 DAY-HOUR 6- 6 9- 6 23- 6 1- 6 9- 6 23- 3 28- 3 25- 6 23- 6 8- 6 30- 6 7- 6 MIN. QFF PRESSURE IN HPA 1013.1 1006.8 1006.7 1000.1 1002.1 995.5 993.3 994.2 997.3 1006.0 1003.1 1014.9 993.3 DAY-HOUR 31-12 3-12 21-15 20-15 17-15 3-15 12-15 12-15 3-12 2-12 11-12 28-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 919.0 916.6 914.9 912.9 912.5 908.7 908.2 909.8 912.0 920.0 918.1 920.3 914.4 MAX. QFE PRESSURE IN HPA 926.6 922.6 920.0 919.0 920.2 918.0 914.0 913.5 917.9 925.0 925.0 925.5 926.6 DAY 6 10 17 1 9 23 27 29 16 17 22 27 MIN. QFE PRESSURE IN HPA 909.6 909.2 908.0 909.0 908.7 905.0 902.0 904.2 907.0 913.0 907.0 913.2 902.0 DAY 9 3 22 13 6 16 12 12 3 2 11 5 MEAN QNH PRESSURE IN HPA 1020.4 1017.8 1015.9 1013.8 1013.3 1009.1 1008.6 1010.4 1012.7 1021.5 1019.3 1021.8 1015.4 MAX. QNH PRESSURE IN HPA 1028.6 1024.3 1021.5 1020.4 1021.7 1019.3 1014.9 1014.4 1019.2 1026.9 1026.9 1027.5 1028.6 DAY 6 10 17 1 9 23 27 29 16 17 22 27 MIN. QNH PRESSURE IN HPA 1010.1 1009.7 1008.4 1009.5 1009.2 1005.1 1001.9 1004.3 1007.3 1013.8 1007.3 1014.1 1001.9 DAY 9 3 22 13 6 16 12 12 3 2 11 5 MEAN QFF PRESSURE IN HPA 1023.4 1018.9 1015.6 1010.4 1008.4 1002.3 1000.8 1002.8 1006.4 1018.6 1019.3 1022.8 1012.5 MAX. QFF PRESSURE IN HPA 1031.5 1025.9 1023.4 1017.9 1018.7 1013.7 1006.6 1006.7 1012.9 1024.5 1027.9 1029.9 1031.5 DAY 7 10 23 1 9 23 27 25 23 9 30 7 MIN. QFF PRESSURE IN HPA 1014.1 1010.4 1007.8 1004.7 1003.6 997.4 993.7 996.3 999.4 1008.1 1004.9 1016.3 993.7 DAY 31 4 22 21 20 16 12 12 3 2 11 5 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.9 917.0 915.8 913.6 913.5 910.3 909.8 911.4 913.1 920.8 918.6 920.7 915.3 MAX. QFE PRESSURE IN HPA 926.6 923.5 921.8 919.7 920.4 919.6 915.0 915.0 919.1 926.0 925.0 925.8 926.6 DAY 6 9 23 1 9 23 28 24 16 17 21 26 MIN. QFE PRESSURE IN HPA 909.6 908.6 908.4 909.2 909.9 907.2 905.0 905.9 908.7 913.6 906.6 913.8 905.0 DAY 9 3 22 13 29 19 12 12 3 2 11 5 MEAN QNH PRESSURE IN HPA 1020.3 1018.2 1016.9 1014.5 1014.4 1010.9 1010.3 1012.1 1013.9 1022.4 1019.9 1022.2 1016.3 MAX. QNH PRESSURE IN HPA 1028.6 1025.3 1023.4 1021.1 1021.9 1021.0 1016.0 1016.0 1020.5 1028.0 1026.9 1027.8 1028.6 DAY 6 9 23 1 9 23 28 24 16 17 21 26 MIN. QNH PRESSURE IN HPA 1010.1 1009.1 1008.8 1009.7 1010.5 1007.5 1005.1 1006.1 1009.2 1014.5 1006.9 1014.7 1005.1 DAY 9 3 22 13 29 19 12 12 3 2 11 5 MEAN QFF PRESSURE IN HPA 1024.0 1020.0 1017.2 1011.6 1009.9 1004.2 1002.6 1005.0 1008.5 1020.5 1020.7 1024.0 1014.0 MAX. QFF PRESSURE IN HPA 1031.0 1028.0 1026.4 1019.2 1019.5 1015.4 1008.6 1009.8 1015.4 1026.4 1029.3 1030.5 1031.0 DAY 6 9 23 1 9 23 28 31 16 9 30 7 MIN. QFF PRESSURE IN HPA 1015.3 1010.0 1009.4 1004.7 1004.7 1000.3 997.3 998.4 1002.7 1010.2 1004.8 1017.4 997.3 DAY 9 3 22 21 29 19 12 12 3 2 11 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 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 920.3 918.5 917.2 914.5 914.1 910.9 910.4 912.1 914.1 922.1 920.2 921.8 916.3 MAX. QFE PRESSURE IN HPA 928.6 925.1 923.2 921.1 921.0 919.5 915.5 915.5 920.5 927.0 927.0 927.3 928.6 DAY 6 9 23 1 9 23 27 25 23 17 21 26 MIN. QFE PRESSURE IN HPA 910.8 909.8 910.2 910.1 910.9 907.9 906.5 906.4 909.5 915.0 908.1 914.8 906.4 DAY 8 3 22 13 20 19 13 12 14 2 11 5 MEAN QNH PRESSURE IN HPA 1021.7 1019.8 1018.4 1015.5 1015.1 1011.5 1011.1 1012.9 1015.0 1023.7 1021.6 1023.4 1017.5 MAX. QNH PRESSURE IN HPA 1030.8 1027.0 1024.9 1022.7 1022.6 1020.9 1016.6 1016.6 1022.0 1029.1 1029.1 1029.4 1030.8 DAY 6 9 23 1 9 23 27 25 23 17 21 26 MIN. QNH PRESSURE IN HPA 1011.5 1010.4 1010.8 1010.7 1011.6 1008.3 1006.8 1006.7 1010.0 1016.0 1008.5 1015.8 1006.7 DAY 8 3 22 13 20 19 13 12 14 2 11 5 MEAN QFF PRESSURE IN HPA 1025.6 1021.6 1018.3 1012.1 1010.3 1004.5 1003.1 1005.3 1009.1 1021.3 1022.2 1025.2 1014.9 MAX. QFF PRESSURE IN HPA 1033.3 1029.6 1027.1 1020.3 1019.9 1015.1 1008.3 1009.9 1016.7 1026.8 1031.6 1031.6 1033.3 DAY 6 9 23 1 9 23 27 25 23 8 30 7 MIN. QFF PRESSURE IN HPA 1014.9 1011.1 1010.8 1005.7 1004.9 1000.3 998.7 998.8 1002.8 1010.8 1006.8 1018.6 998.7 DAY 8 3 8 20 20 19 15 12 3 2 11 5 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 919.3 917.5 915.9 913.1 912.9 909.4 909.0 910.7 912.4 920.5 918.9 920.5 915.0 MAX. QFE PRESSURE IN HPA 927.8 924.6 922.2 918.4 919.6 917.5 914.0 914.0 918.3 925.5 926.0 925.0 927.8 DAY 6 9 23 1 9 23 27 25 23 17 21 26 MIN. QFE PRESSURE IN HPA 911.0 908.2 908.6 908.4 908.7 905.2 904.6 905.4 907.6 912.6 906.5 913.5 904.6 DAY 8 3 8 13 31 3 12 12 3 2 11 5 MEAN QNH PRESSURE IN HPA 1020.7 1018.7 1017.0 1013.9 1013.7 1009.9 1009.5 1011.3 1013.2 1022.0 1020.3 1022.0 1016.0 MAX. QNH PRESSURE IN HPA 1030.0 1026.5 1023.9 1019.7 1021.0 1018.7 1014.9 1014.9 1019.6 1027.5 1028.0 1026.9 1030.0 DAY 6 9 23 1 9 23 27 25 23 17 21 26 MIN. QNH PRESSURE IN HPA 1011.7 1008.6 1009.1 1008.8 1009.2 1005.4 1004.7 1005.6 1008.0 1013.4 1006.8 1014.4 1004.7 DAY 8 3 8 13 31 3 12 12 3 2 11 5 MEAN QFF PRESSURE IN HPA 1023.8 1020.0 1016.6 1010.5 1008.7 1002.8 1001.6 1003.6 1007.0 1019.1 1020.3 1023.0 1013.1 MAX. QFF PRESSURE IN HPA 1032.3 1028.4 1025.6 1016.6 1018.2 1012.9 1006.8 1008.0 1014.1 1024.7 1029.9 1029.5 1032.3 DAY 6 9 23 1 9 22 27 25 23 16 30 7 MIN. QFF PRESSURE IN HPA 1014.9 1008.6 1007.2 1003.8 1002.3 998.5 996.5 997.9 1000.7 1007.9 1004.3 1016.3 996.5 DAY 29 3 8 20 20 3 12 11 3 2 11 5 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 918.0 915.8 914.0 911.2 911.3 907.3 906.7 908.4 910.2 918.6 917.6 919.2 913.2 MAX. QFE PRESSURE IN HPA 926.6 922.8 919.8 916.4 918.2 915.6 912.0 911.7 916.1 924.0 924.0 923.6 926.6 DAY 6 9 23 16 9 22 27 30 22 17 21 6 MIN. QFE PRESSURE IN HPA 909.6 907.0 908.0 906.0 908.0 902.9 902.0 903.0 905.0 910.9 905.5 912.7 902.0 DAY 8 3 10 12 7 3 12 12 3 2 11 5 MEAN QNH PRESSURE IN HPA 1019.3 1016.9 1014.9 1011.9 1012.0 1007.7 1007.0 1008.8 1010.7 1019.9 1018.9 1020.6 1014.0 MAX. QNH PRESSURE IN HPA 1028.6 1024.5 1021.2 1017.5 1019.5 1016.7 1012.8 1012.4 1017.2 1025.8 1025.8 1025.4 1028.6 DAY 6 9 23 16 9 22 27 30 22 17 21 6 MIN. QNH PRESSURE IN HPA 1010.1 1007.3 1008.4 1006.2 1008.4 1002.8 1001.9 1003.0 1005.1 1011.6 1005.7 1013.5 1001.9 DAY 8 3 10 12 7 3 12 12 3 2 11 5 MEAN QFF PRESSURE IN HPA 1022.2 1017.9 1014.6 1008.6 1007.1 1000.8 999.1 1001.1 1004.4 1017.1 1018.9 1021.5 1011.1 MAX. QFF PRESSURE IN HPA 1030.9 1026.4 1022.9 1014.5 1016.6 1010.7 1004.5 1004.9 1011.5 1022.9 1028.1 1027.6 1030.9 DAY 6 9 23 1 9 22 27 30 23 17 30 6 MIN. QFF PRESSURE IN HPA 1013.1 1006.8 1007.4 1000.9 1002.2 996.3 993.7 995.0 997.3 1006.0 1003.1 1014.9 993.7 DAY 31 3 21 20 20 3 12 12 3 2 11 28 ======================================================================================================================= 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 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 918.4 916.0 914.0 911.2 911.2 906.7 906.0 907.8 909.7 918.7 918.0 919.8 913.1 MAX. QFE PRESSURE IN HPA 927.0 922.8 919.2 916.2 917.6 914.6 911.0 911.4 915.5 923.5 923.8 924.8 927.0 DAY 6 9 23 16 9 22 27 30 23 17 21 6 MIN. QFE PRESSURE IN HPA 909.6 907.3 907.0 904.8 907.9 902.1 901.6 902.2 904.6 910.7 907.4 913.8 901.6 DAY 8 3 21 20 2 3 12 12 3 2 10 5 MEAN QNH PRESSURE IN HPA 1019.8 1017.1 1014.9 1011.9 1011.8 1006.9 1006.2 1008.1 1010.2 1020.0 1019.3 1021.2 1014.0 MAX. QNH PRESSURE IN HPA 1029.1 1024.5 1020.6 1017.3 1018.9 1015.6 1011.7 1012.1 1016.6 1025.3 1025.6 1026.7 1029.1 DAY 6 9 23 16 9 22 27 30 23 17 21 6 MIN. QNH PRESSURE IN HPA 1010.1 1007.6 1007.3 1004.9 1008.3 1002.0 1001.4 1002.1 1004.7 1011.3 1007.7 1014.7 1001.4 DAY 8 3 21 20 2 3 12 12 3 2 10 5 MEAN QFF PRESSURE IN HPA 1023.4 1018.7 1015.1 1009.0 1007.3 1000.1 998.4 1000.9 1004.8 1018.1 1020.2 1022.9 1011.6 MAX. QFF PRESSURE IN HPA 1031.5 1027.0 1022.4 1013.8 1016.0 1009.5 1004.2 1005.4 1011.8 1023.4 1028.5 1028.8 1031.5 DAY 6 9 23 16 9 22 27 30 23 17 30 6 MIN. QFF PRESSURE IN HPA 1014.4 1007.9 1006.7 1000.1 1002.1 995.5 993.3 994.2 998.2 1007.2 1006.4 1015.9 993.3 DAY 8 3 21 20 17 3 12 12 3 2 10 28 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 919.1 916.8 914.9 912.8 912.5 907.8 907.1 908.8 910.9 919.7 918.6 920.5 914.1 MAX. QFE PRESSURE IN HPA 927.0 923.6 919.9 916.8 918.6 916.3 912.0 912.8 916.5 924.5 925.0 925.5 927.0 DAY 6 9 17 16 8 22 27 28 23 16 21 26 MIN. QFE PRESSURE IN HPA 909.6 908.5 907.6 907.0 908.4 903.7 903.2 903.0 906.5 912.4 907.9 914.7 903.0 DAY 8 3 21 20 2 3 12 12 2 2 10 4 MEAN QNH PRESSURE IN HPA 1020.5 1018.0 1016.0 1013.6 1013.3 1008.2 1007.4 1009.3 1011.6 1021.1 1020.0 1022.0 1015.1 MAX. QNH PRESSURE IN HPA 1029.1 1025.4 1021.4 1018.0 1019.9 1017.4 1012.8 1013.6 1017.7 1026.4 1026.9 1027.5 1029.1 DAY 6 9 17 16 8 22 27 28 23 16 21 26 MIN. QNH PRESSURE IN HPA 1010.1 1008.9 1008.0 1007.3 1008.8 1003.7 1003.2 1003.0 1006.8 1013.2 1008.3 1015.7 1003.0 DAY 8 3 21 20 2 3 12 12 2 2 10 4 MEAN QFF PRESSURE IN HPA 1024.2 1019.7 1015.8 1010.2 1008.4 1001.1 999.4 1001.7 1005.7 1018.7 1020.6 1023.7 1012.4 MAX. QFF PRESSURE IN HPA 1031.6 1027.7 1022.0 1013.7 1016.9 1011.7 1004.9 1006.3 1012.2 1024.3 1029.2 1029.6 1031.6 DAY 6 9 23 4 8 22 27 25 23 16 30 26 MIN. QFF PRESSURE IN HPA 1015.2 1009.4 1007.5 1001.6 1003.4 996.2 995.0 995.0 999.5 1007.9 1006.2 1017.3 995.0 DAY 8 3 21 20 31 15 14 12 2 2 10 28 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 919.1 916.8 915.2 912.9 912.6 908.5 907.8 909.3 911.4 919.9 918.5 920.5 914.4 MAX. QFE PRESSURE IN HPA 927.0 924.0 920.0 916.7 918.6 917.1 913.0 914.1 916.9 924.7 925.0 925.5 927.0 DAY 6 9 16 16 8 22 27 28 15 17 21 26 MIN. QFE PRESSURE IN HPA 909.6 909.1 907.6 908.4 908.6 904.4 902.6 904.0 907.0 912.6 906.5 914.2 902.6 DAY 8 3 21 12 2 3 11 12 2 1 13 4 MEAN QNH PRESSURE IN HPA 1020.5 1018.0 1016.2 1013.8 1013.4 1008.9 1008.2 1009.9 1012.1 1021.4 1019.8 1022.0 1015.3 MAX. QNH PRESSURE IN HPA 1029.1 1025.8 1021.5 1017.9 1019.9 1018.3 1013.8 1015.0 1018.1 1026.6 1026.9 1027.5 1029.1 DAY 6 9 16 16 8 22 27 28 15 17 21 26 MIN. QNH PRESSURE IN HPA 1010.1 1009.6 1008.0 1008.8 1009.1 1004.5 1002.5 1004.0 1007.3 1013.4 1006.8 1015.2 1002.5 DAY 8 3 21 12 2 3 11 12 2 1 13 4 MEAN QFF PRESSURE IN HPA 1023.6 1019.1 1015.7 1010.3 1008.4 1001.8 1000.3 1002.2 1005.9 1018.5 1019.9 1022.9 1012.4 MAX. QFF PRESSURE IN HPA 1031.8 1027.6 1022.1 1013.8 1016.5 1012.5 1006.2 1006.7 1011.8 1024.0 1028.2 1029.5 1031.8 DAY 6 9 23 4 8 22 27 30 22 17 22 6 MIN. QFF PRESSURE IN HPA 1014.6 1009.7 1007.2 1005.0 1003.3 996.8 994.2 996.4 1000.1 1007.7 1005.6 1017.2 994.2 DAY 8 3 21 20 31 15 11 10 2 1 13 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 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.8 6.2 13.0 18.7 23.5 29.0 32.3 31.4 23.3 17.7 11.9 3.1 18.0 MINIMUN AIR TEMPERATURE (C) 0.2 0.5 5.9 10.4 15.6 19.1 22.9 21.6 13.5 10.0 6.2 -2.0 10.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 10 28 21 2 0 0 0 62 DAYS WITH MINIMUM TEMP. <=-4 3 2 0 0 0 0 0 0 0 0 0 12 17 DAYS WITH FREEZING MIN.<= 0 16 13 0 0 0 0 0 0 0 0 0 22 51 TEMPERATURE RECORDS LOWEST(C) -6.0 -6.5 0.5 2.0 8.0 8.0 19.2 16.4 6.5 3.0 1.0 -8.0 -8.0 DAY 11 19 18 6 7 6 2 21 22 13 14 8 MAXIMUM AIR TEMPERATURE (C) 12.2 12.9 19.9 26.9 30.9 37.1 40.5 40.2 31.9 25.3 18.6 9.3 25.5 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 7 19 30 31 31 25 1 0 0 144 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 17.6 20.0 27.5 35.5 36.5 41.0 44.5 44.0 36.0 30.0 24.5 16.0 44.5 DAY 30 27 30 22 29 16 17 1 2 14 2 1 DIF. BETWEEN (MAX.-MIN.) (C) 12.0 12.4 14.0 16.5 15.3 18.0 17.6 18.6 18.4 15.3 12.4 11.3 15.2 MEAN DAILY TEMP. (MDT) (C) 6.2 6.7 12.9 18.7 23.2 28.1 31.7 30.9 22.7 17.7 12.4 3.7 17.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 19.8 85.5 214.1 330.7 306.0 62.0 1.8 0.0 0.0 1019.8 HEATING DEG. DAYS(BASE 18 0C) 365.1 315.8 160.8 34.9 1.7 0.0 0.0 0.0 0.3 28.2 168.2 444.3 1519.2 DEWPOINT (MEAN C) -0.9 -2.9 1.1 4.7 6.3 5.4 9.5 6.6 2.5 5.7 4.5 -3.9 3.2 MIXING RATIO (G/KG) 4.05 3.48 4.73 6.10 6.89 6.53 8.57 7.00 5.33 6.64 6.10 3.32 5.73 VAPOUR PRESSURE (HPA) 5.94 5.08 6.90 8.87 9.99 9.40 12.28 10.07 7.76 9.69 8.88 4.87 8.31 SATURATION DEF. (HPA) 3.66 4.94 8.84 14.44 20.65 32.78 38.52 38.37 22.87 11.50 5.65 3.24 17.12 RELATIVE HUMIDITY (MEAN %) 66 56 49 45 38 26 27 23 28 50 66 63 45 RELATIVE HUMIDITY (MAX. %) 84 77 73 70 62 41 41 37 47 71 85 82 64 RELATIVE HUMIDITY (MIN. %) 41 31 27 24 20 15 16 13 16 30 41 38 26 RELATIVE HUMIDITY (MEAN% 03UTC) 81 72 69 64 58 39 40 37 44 67 82 80 61 RELATIVE HUMIDITY (MEAN% 09UTC) 49 40 33 28 25 18 21 17 19 34 48 45 31 RELATIVE HUMIDITY (MEAN% 15UTC) 59 46 36 34 25 16 18 15 20 41 56 55 35 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 9.6 38.2 25.6 18.6 31.0 0.0 0.0 0.0 0.0 31.6 42.6 4.8 202.0 DAYS WITH PRECIPITATION >=10 0 2 1 1 1 0 0 0 0 0 2 0 7 DAYS WITH PRECIPITATION >= 5 0 2 2 1 2 0 0 0 0 3 4 0 14 DAYS WITH PRECIPITATION >= 1 3 2 4 3 3 0 0 0 0 8 8 1 32 DAYS WITH PRECIPITATION 6 3 5 11 3 0 0 0 0 9 10 5 52 GREATEST DAILY PRECIPITATION 4.2 21.0 14.0 14.0 20.0 0.0 0.0 0.0 0.0 9.0 14.0 4.0 21.0 DAY 16 1 12 30 6 ** ** ** ** 18 25 1 DAY WITH THUNDER STORM 0 0 1 6 2 0 0 0 0 2 2 0 13 DAYS WITH SNOW OR SLEET 1 1 0 0 0 0 0 0 0 0 0 1 3 DAYS WITH DUST 3 1 1 3 2 0 1 1 1 1 0 0 14 WIND DIRECTION (PREVAILING) 270 270 270 315 315 90 90 90 90 90 315 270 90 PREVAILING WIND SPEED(KNOTS) 9.1 8.5 8.7 12.5 8.7 9.0 10.0 10.5 9.1 7.6 6.4 10.8 8.9 PREVAILING WIND PERCENT 18.5 19.2 21.4 17.9 19.4 17.9 37.1 37.1 26.7 10.9 12.9 14.1 14.2 CALMS PERCENT OF WIND 64.9 54.5 47.6 48.8 40.3 41.3 48.0 48.4 60.8 61.7 64.6 69.0 54.1 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 286 278 282 296 301 340 82 88 77 308 293 282 332 VECTOR WIND MAGNITUDE(KNOTS) 2.2 2.2 2.5 2.8 2.1 1.6 4.0 4.3 2.5 0.6 1.1 1.7 0.7 WIND STEADINESES (MEAN %) 75.9 64.7 56.8 59.6 43.7 29.1 80.0 84.3 73.5 20.0 45.8 63.0 17.5 WIND SPEED (MEAN KNOTS) 2.9 3.4 4.4 4.7 4.8 5.5 5.0 5.1 3.4 3.0 2.4 2.7 4.0 FASTEST WIND DIRECTION 280 270 250 260 290 330 90 90 90 300 270 270 260 FASTEST WIND SPEED (KNOTS) 23 23 23 29 23 23 19 21 17 25 16 23 29 DAY 17 1 7 2 3 4 12 10 4 31 8 4 DAYS WITH SKY CLEAR (0-2)/8 16 12 13 15 18 29 31 31 25 18 13 17 238 DAYS WITH P.CLOUDY (3-6)/8 9 13 15 14 12 1 0 0 4 11 10 11 100 DAYS WITH CLOUDY (7-8)/8 6 3 3 1 1 0 0 0 1 2 7 3 27 DAYS WITH VISIBILITY =< 2 KM 0 1 0 0 0 0 0 0 0 0 0 0 1 DURATION OF SUNSHINE HOURS 173.7 198.3 238.1 238.4 293.5 359.4 369.9 355.6 299.9 247.9 180.9 177.0 3132.6 ======================================================================================================================= 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 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 917.7 914.9 913.9 914.3 912.3 906.2 904.1 905.9 915.8 919.0 916.3 919.7 913.3 MAX. QFE PRESSURE IN HPA 928.0 925.0 921.5 929.0 919.0 914.1 911.3 913.0 925.5 925.7 924.4 928.1 929.0 DAY-HOUR 10- 6 19- 6 18- 6 5- 6 18- 6 9- 6 2- 6 22- 6 23- 6 10- 6 2- 6 7-18 MIN. QFE PRESSURE IN HPA 906.5 906.5 901.7 906.3 906.0 900.2 897.9 898.6 905.8 911.3 904.9 903.0 897.9 DAY-HOUR 16-12 1- 3 7-12 2- 9 1-12 25-15 30-15 2-15 1-15 2-12 25-21 3-18 MEAN QNH PRESSURE IN HPA 1019.0 1015.9 1014.9 1015.3 1013.0 1006.4 1004.2 1006.1 1016.9 1020.3 1017.4 1021.2 1014.2 MAX. QNH PRESSURE IN HPA 1030.2 1026.9 1023.1 1031.3 1020.4 1015.0 1012.0 1013.8 1027.5 1027.7 1026.3 1030.3 1031.3 DAY-HOUR 10- 6 19- 6 18- 6 5- 6 18- 6 9- 6 2- 6 22- 6 23- 6 10- 6 2- 6 7-18 MIN. QNH PRESSURE IN HPA 1006.8 1006.8 1001.5 1006.6 1006.2 999.9 997.4 998.2 1006.0 1012.0 1005.0 1003.0 997.4 DAY-HOUR 16-12 1- 3 7-12 2- 9 1-12 25-15 30-15 2-15 1-15 2-12 25-21 3-18 MEAN QFF PRESSURE IN HPA 1020.4 1017.1 1013.4 1011.7 1007.8 999.3 995.9 998.2 1011.8 1017.2 1016.3 1023.7 1011.0 MAX. QFF PRESSURE IN HPA 1033.8 1031.4 1022.9 1031.1 1016.1 1008.4 1005.3 1006.4 1023.8 1025.5 1024.4 1036.0 1036.0 DAY-HOUR 10- 6 19- 6 17- 6 5- 6 18- 6 9- 6 2- 6 22- 6 23- 6 10- 6 10- 6 8- 3 MIN. QFF PRESSURE IN HPA 1007.8 1006.1 998.9 1002.0 1000.7 992.3 988.7 990.0 999.0 1006.7 1003.7 1002.7 988.7 DAY-HOUR 16-12 1- 3 7-12 26-15 13-12 25-15 30-18 1-12 2-15 2-12 25-21 4- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 917.7 914.8 913.9 914.6 912.4 906.5 904.6 906.1 915.8 919.0 916.4 919.6 913.4 MAX. QFE PRESSURE IN HPA 926.5 924.0 918.9 924.0 917.6 911.1 909.2 910.4 922.9 924.3 922.6 928.1 928.1 DAY 10 19 18 5 18 9 2 16 23 24 2 8 MIN. QFE PRESSURE IN HPA 908.0 908.0 905.3 907.9 908.2 902.2 900.0 900.6 908.2 914.0 905.4 903.2 900.0 DAY 16 1 12 2 3 22 31 2 1 15 26 4 MEAN QNH PRESSURE IN HPA 1018.9 1015.8 1014.8 1015.6 1013.2 1006.7 1004.7 1006.3 1016.9 1020.4 1017.5 1021.1 1014.3 MAX. QNH PRESSURE IN HPA 1028.5 1025.8 1020.3 1025.8 1018.9 1011.8 1009.7 1011.0 1024.6 1026.1 1024.3 1030.3 1030.3 DAY 10 19 18 5 18 9 2 16 23 24 2 8 MIN. QNH PRESSURE IN HPA 1008.4 1008.4 1005.5 1008.3 1008.6 1002.1 999.7 1000.3 1008.6 1014.9 1005.6 1003.2 999.7 DAY 16 1 12 2 3 22 31 2 1 15 26 4 MEAN QFF PRESSURE IN HPA 1019.7 1016.6 1013.2 1011.9 1007.9 999.5 996.3 998.2 1011.6 1016.8 1016.1 1023.2 1010.9 MAX. QFF PRESSURE IN HPA 1030.5 1030.3 1020.0 1025.9 1014.5 1005.4 1003.0 1002.2 1021.1 1024.4 1022.1 1034.9 1034.9 DAY 10 19 18 6 18 9 2 16 23 24 10 8 MIN. QFF PRESSURE IN HPA 1008.8 1007.1 1004.7 1003.2 1003.5 994.3 990.2 991.0 1000.7 1009.7 1004.6 1002.7 990.2 DAY 16 1 12 26 29 22 31 1 1 15 26 4 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.0 915.1 914.6 915.3 913.3 907.9 905.9 907.5 916.9 919.6 916.8 920.0 914.2 MAX. QFE PRESSURE IN HPA 927.2 923.1 919.9 925.2 918.1 913.2 910.9 911.5 924.1 924.4 922.9 927.8 927.8 DAY 10 19 17 5 18 9 2 16 23 9 2 8 MIN. QFE PRESSURE IN HPA 907.4 906.5 905.0 907.9 908.7 903.2 901.4 901.6 909.7 914.8 908.0 904.5 901.4 DAY 16 1 12 2 1 22 31 2 1 2 26 4 MEAN QNH PRESSURE IN HPA 1019.3 1016.1 1015.6 1016.3 1014.2 1008.2 1006.1 1007.9 1018.1 1021.0 1018.0 1021.5 1015.2 MAX. QNH PRESSURE IN HPA 1029.3 1024.8 1021.4 1027.1 1019.4 1014.1 1011.6 1012.2 1025.9 1026.3 1024.6 1030.0 1030.0 DAY 10 19 17 5 18 9 2 16 23 9 2 8 MIN. QNH PRESSURE IN HPA 1007.7 1006.8 1005.1 1008.3 1009.2 1003.2 1001.2 1001.4 1010.2 1015.8 1008.4 1004.6 1001.2 DAY 16 1 12 2 1 22 31 2 1 2 26 4 MEAN QFF PRESSURE IN HPA 1021.1 1017.6 1014.6 1013.2 1009.3 1001.1 998.1 1000.5 1013.5 1018.3 1017.4 1024.4 1012.4 MAX. QFF PRESSURE IN HPA 1032.1 1029.5 1021.7 1027.1 1015.3 1007.7 1004.7 1005.7 1023.5 1024.9 1023.4 1036.0 1036.0 DAY 10 19 17 5 18 9 2 22 23 10 10 8 MIN. QFF PRESSURE IN HPA 1008.4 1006.1 1004.7 1005.5 1004.0 994.9 992.5 993.5 1003.1 1011.1 1008.0 1005.4 992.5 DAY 16 1 12 26 13 22 31 2 1 2 26 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 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 919.2 916.3 915.9 916.1 914.0 908.4 906.6 908.5 918.1 920.8 918.1 921.1 915.2 MAX. QFE PRESSURE IN HPA 928.0 925.0 921.5 929.0 919.0 914.1 911.3 913.0 925.5 925.7 924.4 928.0 929.0 DAY 10 19 18 5 18 9 2 22 23 10 2 8 MIN. QFE PRESSURE IN HPA 909.5 906.5 906.0 908.6 909.5 903.8 903.0 902.8 911.3 915.2 909.0 905.7 902.8 DAY 16 1 12 2 1 22 8 2 1 2 26 4 MEAN QNH PRESSURE IN HPA 1020.6 1017.5 1017.0 1017.2 1015.0 1008.8 1006.9 1008.9 1019.4 1022.3 1019.3 1022.6 1016.3 MAX. QNH PRESSURE IN HPA 1030.2 1026.9 1023.1 1031.3 1020.4 1015.0 1012.0 1013.8 1027.5 1027.7 1026.3 1030.2 1031.3 DAY 10 19 18 5 18 9 2 22 23 10 2 8 MIN. QNH PRESSURE IN HPA 1010.0 1006.8 1006.2 1009.1 1010.0 1003.8 1003.0 1002.7 1012.0 1016.2 1009.5 1005.9 1002.7 DAY 16 1 12 2 1 22 8 2 1 2 26 4 MEAN QFF PRESSURE IN HPA 1022.4 1019.0 1015.7 1013.5 1009.8 1001.7 998.6 1000.9 1014.1 1019.2 1018.5 1025.5 1013.2 MAX. QFF PRESSURE IN HPA 1033.8 1031.4 1022.9 1031.1 1016.1 1008.4 1005.3 1006.4 1023.8 1025.5 1024.4 1035.9 1035.9 DAY 10 19 17 5 18 9 2 22 23 10 10 8 MIN. QFF PRESSURE IN HPA 1011.0 1006.6 1005.1 1006.0 1004.7 995.8 993.6 993.8 1004.6 1011.6 1008.4 1006.2 993.6 DAY 16 1 7 26 13 22 31 2 1 2 26 4 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.1 915.3 914.7 914.6 912.6 906.8 905.0 906.8 916.5 919.3 916.5 919.9 913.8 MAX. QFE PRESSURE IN HPA 926.8 924.5 920.2 928.0 917.5 912.4 909.3 911.0 923.6 924.2 923.3 927.0 928.0 DAY 10 18 18 5 18 8 13 15 23 23 2 7 MIN. QFE PRESSURE IN HPA 907.6 907.7 904.4 906.3 907.3 902.4 901.3 901.1 909.7 913.5 909.0 905.5 901.1 DAY 16 12 7 2 1 22 20 2 1 2 26 4 MEAN QNH PRESSURE IN HPA 1019.4 1016.4 1015.7 1015.6 1013.4 1007.0 1005.2 1007.1 1017.7 1020.7 1017.7 1021.3 1014.8 MAX. QNH PRESSURE IN HPA 1028.9 1026.4 1021.7 1030.2 1018.7 1013.2 1009.8 1011.7 1025.4 1026.0 1025.1 1029.1 1030.2 DAY 10 18 18 5 18 8 13 15 23 23 2 7 MIN. QNH PRESSURE IN HPA 1008.0 1008.1 1004.5 1006.6 1007.6 1002.3 1001.1 1000.9 1010.2 1014.4 1009.5 1005.7 1000.9 DAY 16 12 7 2 1 22 20 2 1 2 26 4 MEAN QFF PRESSURE IN HPA 1020.4 1017.3 1014.0 1011.7 1008.1 999.8 996.8 999.0 1012.4 1017.3 1016.2 1023.4 1011.4 MAX. QFF PRESSURE IN HPA 1031.5 1029.8 1020.4 1030.0 1014.6 1006.5 1002.6 1003.7 1021.6 1023.8 1021.9 1033.8 1033.8 DAY 10 19 18 5 18 8 2 15 23 10 1 7 MIN. QFF PRESSURE IN HPA 1008.4 1008.9 1002.0 1003.8 1002.7 994.1 991.7 991.7 1002.6 1009.3 1007.8 1006.0 991.7 DAY 16 1 7 2 13 22 31 2 1 2 26 4 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 916.6 913.6 912.6 913.0 910.8 904.7 902.7 904.4 914.3 917.5 915.1 918.5 912.0 MAX. QFE PRESSURE IN HPA 924.7 923.0 917.7 925.0 915.5 910.2 907.1 908.4 922.5 923.5 921.0 926.4 926.4 DAY 9 18 18 5 18 8 13 15 23 23 2 7 MIN. QFE PRESSURE IN HPA 906.5 906.5 901.7 906.3 906.0 901.0 899.0 899.4 906.5 911.3 909.0 904.5 899.0 DAY 16 12 7 2 1 25 30 2 1 2 26 4 MEAN QNH PRESSURE IN HPA 1017.8 1014.4 1013.4 1013.8 1011.4 1004.8 1002.6 1004.5 1015.2 1018.8 1016.1 1019.9 1012.7 MAX. QNH PRESSURE IN HPA 1026.6 1024.7 1019.0 1026.9 1016.6 1010.8 1007.4 1008.8 1024.2 1025.3 1022.6 1028.4 1028.4 DAY 9 18 18 5 18 8 13 15 23 23 2 7 MIN. QNH PRESSURE IN HPA 1006.8 1006.8 1001.5 1006.6 1006.2 1000.8 998.6 999.0 1006.8 1012.0 1009.5 1004.6 998.6 DAY 16 12 7 2 1 25 30 2 1 2 26 4 MEAN QFF PRESSURE IN HPA 1018.6 1015.2 1011.8 1010.2 1006.1 997.6 994.2 996.4 1010.0 1015.4 1014.7 1021.9 1009.3 MAX. QFF PRESSURE IN HPA 1028.5 1028.0 1017.9 1026.6 1013.0 1004.1 1000.2 1001.1 1020.7 1022.5 1019.7 1032.8 1032.8 DAY 10 18 3 5 7 8 2 22 23 23 1 7 MIN. QFF PRESSURE IN HPA 1007.8 1006.6 998.9 1002.6 1000.7 992.7 989.4 990.0 999.6 1006.7 1008.0 1004.6 989.4 DAY 16 1 7 26 13 25 30 1 1 2 26 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 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 917.2 913.9 912.5 912.8 910.6 904.0 901.7 903.5 913.9 917.7 915.4 919.1 911.9 MAX. QFE PRESSURE IN HPA 925.3 923.6 917.6 924.6 914.9 909.0 906.4 907.7 921.7 923.4 921.4 927.4 927.4 DAY 9 18 18 5 17 8 13 15 23 23 1 7 MIN. QFE PRESSURE IN HPA 909.3 907.5 903.4 907.0 906.0 900.2 897.9 898.6 905.8 912.1 908.7 904.7 897.9 DAY 16 12 7 2 1 25 30 2 1 2 25 3 MEAN QNH PRESSURE IN HPA 1018.4 1014.9 1013.3 1013.6 1011.2 1004.0 1001.6 1003.5 1014.8 1019.0 1016.5 1020.5 1012.6 MAX. QNH PRESSURE IN HPA 1027.2 1025.4 1018.9 1026.5 1015.9 1009.5 1006.7 1008.1 1023.3 1025.2 1023.0 1029.5 1029.5 DAY 9 18 18 5 17 8 13 15 23 23 1 7 MIN. QNH PRESSURE IN HPA 1009.8 1007.9 1003.4 1007.3 1006.2 999.9 997.4 998.2 1006.0 1012.9 1009.2 1004.8 997.4 DAY 16 12 7 2 1 25 30 2 1 2 25 3 MEAN QFF PRESSURE IN HPA 1020.1 1016.3 1012.2 1010.6 1006.3 997.0 993.4 996.0 1010.3 1016.3 1015.8 1023.4 1009.8 MAX. QFF PRESSURE IN HPA 1029.6 1028.9 1018.8 1026.8 1012.3 1003.3 999.1 1000.8 1020.8 1022.9 1021.5 1035.2 1035.2 DAY 9 18 3 5 7 8 2 22 23 23 1 7 MIN. QFF PRESSURE IN HPA 1011.6 1009.1 1001.8 1002.0 1001.1 992.3 988.8 990.1 999.0 1008.1 1008.0 1005.6 988.8 DAY 16 1 7 26 13 25 30 2 2 2 25 3 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 917.8 915.0 913.7 914.0 912.1 905.5 902.9 905.0 915.2 918.9 916.0 919.9 913.0 MAX. QFE PRESSURE IN HPA 926.3 924.0 918.2 924.6 916.7 910.1 908.2 908.9 922.4 924.1 921.9 928.1 928.1 DAY 9 18 3 5 17 8 13 15 22 23 1 7 MIN. QFE PRESSURE IN HPA 909.3 909.0 906.6 908.3 907.5 902.0 898.5 900.0 907.7 914.0 907.0 903.0 898.5 DAY 16 8 12 2 1 25 30 1 1 14 25 3 MEAN QNH PRESSURE IN HPA 1019.0 1016.0 1014.6 1015.0 1012.9 1005.6 1002.9 1005.1 1016.3 1020.3 1017.1 1021.3 1013.8 MAX. QNH PRESSURE IN HPA 1028.3 1025.8 1019.5 1026.5 1017.9 1010.7 1008.6 1009.4 1024.1 1025.9 1023.5 1030.3 1030.3 DAY 9 18 3 5 17 8 13 15 22 23 1 7 MIN. QNH PRESSURE IN HPA 1009.8 1009.5 1006.9 1008.7 1007.9 1001.9 998.1 999.7 1008.1 1014.9 1007.3 1003.0 998.1 DAY 16 8 12 2 1 25 30 1 1 14 25 3 MEAN QFF PRESSURE IN HPA 1020.8 1017.4 1013.3 1011.3 1007.6 998.5 994.5 997.1 1011.0 1017.1 1016.2 1024.2 1010.8 MAX. QFF PRESSURE IN HPA 1030.9 1029.9 1019.4 1026.7 1013.9 1004.0 1000.8 1000.8 1020.4 1024.0 1021.3 1035.8 1035.8 DAY 9 18 1 5 17 7 1 15 23 23 9 7 MIN. QFF PRESSURE IN HPA 1011.7 1010.6 1006.1 1004.7 1002.2 993.5 988.7 990.6 1001.0 1010.7 1006.0 1003.6 988.7 DAY 16 12 12 24 12 25 30 1 1 1 25 3 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 917.5 915.1 913.8 914.4 912.4 906.0 903.6 905.6 915.6 919.1 916.0 919.8 913.2 MAX. QFE PRESSURE IN HPA 926.2 924.0 918.0 924.6 918.7 910.1 908.2 909.7 922.5 924.3 922.1 928.1 928.1 DAY 9 18 17 5 17 8 13 15 22 23 1 7 MIN. QFE PRESSURE IN HPA 909.2 908.1 905.8 906.8 908.0 902.2 899.5 900.3 907.7 914.0 904.9 903.2 899.5 DAY 15 11 11 1 1 21 30 1 2 14 25 3 MEAN QNH PRESSURE IN HPA 1018.8 1016.1 1014.7 1015.3 1013.2 1006.2 1003.6 1005.8 1016.7 1020.5 1017.1 1021.3 1014.1 MAX. QNH PRESSURE IN HPA 1028.2 1025.8 1019.3 1026.5 1020.1 1010.7 1008.6 1010.2 1024.2 1026.1 1023.8 1030.3 1030.3 DAY 9 18 17 5 17 8 13 15 22 23 1 7 MIN. QNH PRESSURE IN HPA 1009.7 1008.5 1006.0 1007.1 1008.4 1002.1 999.1 1000.0 1008.1 1014.9 1005.0 1003.2 999.1 DAY 15 11 11 1 1 21 30 1 2 14 25 3 MEAN QFF PRESSURE IN HPA 1019.8 1017.1 1013.0 1011.5 1007.7 998.9 995.2 997.7 1011.4 1017.1 1015.6 1023.4 1010.7 MAX. QFF PRESSURE IN HPA 1030.5 1029.9 1018.6 1026.6 1015.8 1003.9 1001.8 1002.0 1020.7 1024.3 1021.9 1035.0 1035.0 DAY 9 18 16 5 17 7 1 15 22 23 9 7 MIN. QFF PRESSURE IN HPA 1009.6 1010.1 1004.7 1004.7 1002.3 994.2 989.7 990.8 1001.3 1010.1 1003.7 1002.9 989.7 DAY 31 11 11 25 31 25 30 1 2 14 25 3 ======================================================================================================================= 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 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.8 8.0 12.6 17.8 22.8 28.2 33.0 31.9 25.0 17.1 11.0 3.2 18.0 MINIMUN AIR TEMPERATURE (C) -1.2 1.1 4.7 10.1 15.2 19.3 23.2 21.0 14.9 7.9 2.4 -2.7 9.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 10 26 18 1 0 0 0 55 DAYS WITH MINIMUM TEMP. <=-4 4 0 0 0 0 0 0 0 0 0 3 14 21 DAYS WITH FREEZING MIN.<= 0 25 12 5 0 0 0 0 0 0 0 11 25 78 TEMPERATURE RECORDS LOWEST(C) -4.6 -2.6 -2.4 3.0 10.0 13.6 19.0 15.4 9.5 1.4 -6.2 -7.4 -7.4 DAY 22 26 7 8 9 1 1 11 22 20 30 1 MAXIMUM AIR TEMPERATURE (C) 14.1 15.7 20.4 25.2 30.5 36.0 41.4 40.9 34.1 26.4 20.9 10.3 26.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 1 20 30 31 31 27 8 0 0 148 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 20.2 21.0 26.6 30.0 35.4 41.0 45.4 44.5 38.0 36.6 27.5 17.0 45.4 DAY 31 5 24 30 21 29 16 6 9 4 3 2 DIF. BETWEEN (MAX.-MIN.) (C) 15.3 14.6 15.7 15.1 15.3 16.7 18.2 19.9 19.2 18.5 18.5 13.0 16.6 MEAN DAILY TEMP. (MDT) (C) 6.4 8.4 12.6 17.7 22.8 27.7 32.3 31.0 24.5 17.1 11.7 3.8 18.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 1.6 69.3 200.0 350.6 308.6 111.6 11.7 0.0 0.0 1053.5 HEATING DEG. DAYS(BASE 18 0C) 358.1 268.8 167.8 31.7 0.8 0.0 0.0 0.0 0.0 64.2 189.9 439.3 1520.8 DEWPOINT (MEAN C) -3.2 -1.2 -1.2 4.8 5.3 6.7 7.4 7.5 5.1 -0.7 -5.2 -3.4 1.8 MIXING RATIO (G/KG) 3.38 3.92 4.11 6.17 6.54 7.01 7.40 7.67 6.50 4.23 3.14 3.35 5.29 VAPOUR PRESSURE (HPA) 4.97 5.73 6.00 8.96 9.50 10.12 10.62 11.03 9.40 6.19 4.60 4.93 7.67 SATURATION DEF. (HPA) 4.80 5.57 9.49 12.37 19.64 29.96 42.20 39.10 24.60 15.22 10.08 3.12 18.01 RELATIVE HUMIDITY (MEAN %) 57 56 44 47 38 29 23 25 31 34 36 66 41 RELATIVE HUMIDITY (MAX. %) 79 79 66 70 61 47 39 39 49 54 61 84 61 RELATIVE HUMIDITY (MIN. %) 30 33 22 26 20 15 12 15 19 18 17 40 22 RELATIVE HUMIDITY (MEAN% 03UTC) 77 75 63 67 55 46 38 38 46 49 54 78 57 RELATIVE HUMIDITY (MEAN% 09UTC) 39 41 27 30 24 19 16 19 23 24 20 49 28 RELATIVE HUMIDITY (MEAN% 15UTC) 43 44 30 38 27 18 13 17 23 24 25 58 30 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 5.2 23.8 10.8 20.0 12.6 0.2 0.0 0.0 2.0 0.0 0.0 10.5 85.1 DAYS WITH PRECIPITATION >=10 0 1 0 0 0 0 0 0 0 0 0 0 1 DAYS WITH PRECIPITATION >= 5 0 2 1 1 1 0 0 0 0 0 0 0 5 DAYS WITH PRECIPITATION >= 1 1 3 2 6 4 0 0 0 1 0 0 3 20 DAYS WITH PRECIPITATION 5 4 2 7 6 1 0 0 1 0 0 5 31 GREATEST DAILY PRECIPITATION 3.4 14.2 9.0 8.0 5.0 0.2 0.0 0.0 2.0 0.0 0.0 4.0 14.2 DAY 18 23 17 24 27 2 ** ** 20 ** ** 12 DAY WITH THUNDER STORM 0 0 0 2 1 0 0 0 1 0 0 0 4 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 1 1 DAYS WITH DUST 0 0 3 2 3 0 1 0 1 0 3 0 13 WIND DIRECTION (PREVAILING) 270 270 270 315 315 315 90 90 90 90 270 270 90 PREVAILING WIND SPEED(KNOTS) 7.3 7.4 9.0 9.2 10.0 8.5 9.9 9.7 7.5 6.6 10.5 6.7 8.5 PREVAILING WIND PERCENT 11.3 15.6 18.5 20.0 18.1 21.3 27.4 32.3 17.9 11.3 15.4 6.9 11.7 CALMS PERCENT OF WIND 71.8 57.1 50.8 40.4 50.0 40.8 53.2 51.2 54.2 64.1 62.1 82.3 56.6 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 287 296 295 295 309 308 79 81 9 15 285 290 324 VECTOR WIND MAGNITUDE(KNOTS) 1.4 1.4 2.4 2.0 1.8 2.5 2.3 3.3 0.9 0.5 1.7 0.3 0.9 WIND STEADINESES (MEAN %) 66.7 43.7 54.5 39.2 39.1 48.1 54.8 75.0 23.1 20.8 53.1 27.3 25.0 WIND SPEED (MEAN KNOTS) 2.1 3.2 4.4 5.1 4.6 5.2 4.2 4.4 3.9 2.4 3.2 1.1 3.6 FASTEST WIND DIRECTION 300 300 270 320 330 300 100 70 210 30 300 280 300 FASTEST WIND SPEED (KNOTS) 29 27 29 23 29 21 19 17 29 16 33 12 33 DAY 1 8 25 5 6 22 5 15 25 11 25 9 DAYS WITH SKY CLEAR (0-2)/8 24 16 18 7 14 24 31 28 28 27 24 15 256 DAYS WITH P.CLOUDY (3-6)/8 6 10 12 17 12 6 0 3 2 4 6 12 90 DAYS WITH CLOUDY (7-8)/8 1 2 1 6 5 0 0 0 0 0 0 4 19 DAYS WITH VISIBILITY =< 2 KM 0 0 0 0 0 0 0 0 0 0 2 0 2 DURATION OF SUNSHINE HOURS 250.1 224.0 269.9 139.9 ****** ****** 350.4 362.1 308.8 299.3 257.6 179.6 ****** ======================================================================================================================= 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 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 918.9 916.1 914.4 912.5 914.1 908.3 903.5 907.0 911.4 916.9 917.3 920.6 913.4 MAX. QFE PRESSURE IN HPA 928.6 923.0 925.2 919.4 920.0 916.7 909.6 914.0 921.0 927.2 926.1 926.4 928.6 DAY-HOUR 7- 6 12- 6 3- 6 7- 6 26- 6 1- 6 4- 6 25- 6 22- 6 25- 6 16- 6 10- 6 MIN. QFE PRESSURE IN HPA 912.5 904.0 904.5 905.5 907.5 900.0 896.3 900.8 902.6 907.6 908.0 915.5 896.3 DAY-HOUR 11-12 5-12 25-15 16-15 5-15 22-12 16-15 22-15 20-12 12-12 11-12 25-12 MEAN QNH PRESSURE IN HPA 1020.2 1017.2 1015.4 1013.3 1015.0 1008.8 1003.5 1007.2 1012.1 1018.1 1018.5 1022.1 1014.3 MAX. QNH PRESSURE IN HPA 1030.8 1024.7 1027.1 1020.8 1021.5 1017.9 1010.1 1014.9 1022.6 1029.3 1028.1 1028.4 1030.8 DAY-HOUR 7- 6 12- 6 3- 6 7- 6 26- 6 1- 6 4- 6 25- 6 22- 6 25- 6 16- 6 10- 6 MIN. QNH PRESSURE IN HPA 1013.3 1004.0 1004.6 1005.7 1007.9 999.7 995.7 1000.6 1002.5 1008.0 1008.4 1016.6 995.7 DAY-HOUR 11-12 5-12 25-15 16-15 5-15 22-12 16-15 22-15 20-12 12-12 11-12 25-12 MEAN QFF PRESSURE IN HPA 1021.7 1017.7 1014.1 1010.1 1010.0 1001.9 995.0 999.1 1006.4 1015.3 1018.0 1024.6 1011.1 MAX. QFF PRESSURE IN HPA 1032.9 1026.2 1027.3 1019.2 1016.9 1013.0 1002.2 1007.4 1019.2 1028.8 1029.9 1030.6 1032.9 DAY-HOUR 7- 6 12- 6 3- 6 7- 3 29- 9 1- 6 4- 6 25- 6 22- 6 26- 6 28- 6 11- 6 MIN. QFF PRESSURE IN HPA 1014.1 1001.6 1000.7 1002.6 1002.3 991.3 986.7 992.4 996.2 1002.9 1005.1 1018.3 986.7 DAY-HOUR 11-12 5-12 26- 0 16-12 6-12 22-12 16-15 22-12 20-12 12-12 11-12 25-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 918.9 916.2 914.5 912.8 914.4 908.9 903.5 906.9 911.7 916.9 917.4 920.7 913.6 MAX. QFE PRESSURE IN HPA 925.0 921.5 922.4 918.0 918.0 916.0 908.4 911.4 919.0 925.1 923.4 925.3 925.3 DAY 7 14 3 7 26 1 4 25 22 27 28 11 MIN. QFE PRESSURE IN HPA 913.1 907.1 904.6 908.4 911.0 902.4 899.5 903.2 905.9 911.0 912.0 916.8 899.5 DAY 17 5 26 18 7 22 17 23 20 12 25 4 MEAN QNH PRESSURE IN HPA 1020.3 1017.3 1015.4 1013.6 1015.4 1009.4 1003.5 1007.2 1012.4 1018.1 1018.7 1022.2 1014.5 MAX. QNH PRESSURE IN HPA 1026.9 1023.1 1024.1 1019.3 1019.3 1017.1 1008.8 1012.1 1020.4 1027.0 1025.2 1027.2 1027.2 DAY 7 14 3 7 26 1 4 25 22 27 28 11 MIN. QNH PRESSURE IN HPA 1014.0 1007.4 1004.7 1008.8 1011.7 1002.3 999.1 1003.2 1006.1 1011.7 1012.8 1018.0 999.1 DAY 17 5 26 18 7 22 17 23 20 12 25 4 MEAN QFF PRESSURE IN HPA 1021.3 1017.4 1014.0 1010.3 1010.3 1002.5 994.9 998.9 1006.4 1015.0 1017.5 1024.2 1011.1 MAX. QFF PRESSURE IN HPA 1028.0 1023.7 1024.1 1017.7 1015.3 1012.9 1000.8 1004.2 1016.2 1025.6 1027.7 1029.2 1029.2 DAY 8 14 3 7 29 1 4 25 22 27 28 11 MIN. QFF PRESSURE IN HPA 1014.7 1005.3 1000.7 1004.8 1005.6 993.5 989.7 994.5 999.3 1005.7 1011.4 1019.3 989.7 DAY 17 5 26 19 7 22 17 23 20 5 11 4 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 919.2 916.5 915.1 913.5 915.0 909.7 905.0 908.2 912.6 917.7 917.9 921.0 914.3 MAX. QFE PRESSURE IN HPA 925.5 921.1 923.7 918.5 919.2 915.9 909.2 912.8 919.6 925.9 924.1 925.3 925.9 DAY 7 13 3 7 26 1 4 25 22 26 28 11 MIN. QFE PRESSURE IN HPA 913.3 906.3 907.4 908.9 911.6 903.6 900.6 904.2 906.3 910.0 912.5 916.6 900.6 DAY 12 5 26 19 6 22 16 23 20 12 11 4 MEAN QNH PRESSURE IN HPA 1020.6 1017.7 1016.2 1014.4 1016.0 1010.3 1005.2 1008.7 1013.4 1018.9 1019.1 1022.5 1015.2 MAX. QNH PRESSURE IN HPA 1027.5 1022.7 1025.5 1019.8 1020.6 1017.0 1009.7 1013.6 1021.0 1027.9 1025.9 1027.2 1027.9 DAY 7 13 3 7 26 1 4 25 22 26 28 11 MIN. QNH PRESSURE IN HPA 1014.2 1006.6 1007.7 1009.4 1012.3 1003.6 1000.3 1004.3 1006.6 1010.6 1013.3 1017.8 1000.3 DAY 12 5 26 19 6 22 16 23 20 12 11 4 MEAN QFF PRESSURE IN HPA 1022.6 1018.6 1015.4 1011.6 1011.3 1003.7 996.8 1001.0 1008.2 1016.8 1019.1 1025.4 1012.5 MAX. QFF PRESSURE IN HPA 1029.7 1024.6 1026.2 1019.2 1016.0 1012.8 1001.9 1006.3 1018.3 1027.3 1029.2 1029.9 1029.9 DAY 7 13 3 7 29 1 4 25 22 27 28 11 MIN. QFF PRESSURE IN HPA 1015.9 1005.1 1004.9 1004.7 1006.4 995.2 991.5 995.9 1000.5 1006.5 1010.8 1019.9 991.5 DAY 12 5 26 19 6 22 16 23 20 12 11 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 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 920.7 917.8 916.4 914.2 915.7 910.2 905.8 909.5 913.7 919.2 919.2 922.1 915.4 MAX. QFE PRESSURE IN HPA 928.6 923.0 925.2 919.4 920.0 916.7 909.6 914.0 921.0 927.2 926.1 926.4 928.6 DAY 7 12 3 7 26 1 4 25 22 25 16 10 MIN. QFE PRESSURE IN HPA 914.4 907.3 910.0 909.0 912.7 903.2 900.9 905.6 907.2 911.9 912.4 917.4 900.9 DAY 12 5 26 16 6 22 16 23 20 12 11 4 MEAN QNH PRESSURE IN HPA 1022.2 1019.1 1017.6 1015.2 1016.7 1010.8 1006.0 1010.1 1014.6 1020.6 1020.6 1023.8 1016.4 MAX. QNH PRESSURE IN HPA 1030.8 1024.7 1027.1 1020.8 1021.5 1017.9 1010.1 1014.9 1022.6 1029.3 1028.1 1028.4 1030.8 DAY 7 12 3 7 26 1 4 25 22 25 16 10 MIN. QNH PRESSURE IN HPA 1015.4 1007.6 1010.6 1009.5 1013.5 1003.2 1000.7 1005.8 1007.5 1012.6 1013.2 1018.6 1000.7 DAY 12 5 26 16 6 22 16 23 20 12 11 4 MEAN QFF PRESSURE IN HPA 1024.1 1020.0 1016.5 1011.8 1011.8 1004.0 997.5 1001.9 1008.7 1017.9 1020.4 1026.9 1013.5 MAX. QFF PRESSURE IN HPA 1032.9 1026.2 1027.3 1019.1 1016.5 1013.0 1002.2 1007.4 1019.2 1028.8 1029.9 1030.6 1032.9 DAY 7 12 3 7 29 1 4 25 22 26 28 11 MIN. QFF PRESSURE IN HPA 1017.2 1006.4 1007.4 1004.8 1007.5 994.8 991.5 997.0 1000.5 1007.6 1010.1 1020.8 991.5 DAY 12 5 26 19 6 22 16 23 20 12 11 4 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 919.2 916.6 915.1 912.9 914.3 908.8 904.5 908.0 912.0 917.4 917.4 920.8 913.9 MAX. QFE PRESSURE IN HPA 927.3 921.3 924.0 917.5 919.4 915.2 908.1 912.4 918.0 925.8 924.2 926.1 927.3 DAY 7 12 3 7 26 1 4 25 22 25 16 10 MIN. QFE PRESSURE IN HPA 913.6 905.5 907.0 907.8 911.0 901.9 899.4 903.9 905.0 909.7 909.5 916.7 899.4 DAY 12 5 17 16 5 22 16 22 20 12 11 4 MEAN QNH PRESSURE IN HPA 1020.6 1017.8 1016.1 1013.7 1015.3 1009.3 1004.5 1008.4 1012.8 1018.6 1018.7 1022.4 1014.8 MAX. QNH PRESSURE IN HPA 1029.4 1022.9 1025.8 1018.7 1020.8 1016.2 1008.5 1013.2 1019.3 1027.8 1026.0 1028.1 1029.4 DAY 7 12 3 7 26 1 4 25 22 25 16 10 MIN. QNH PRESSURE IN HPA 1014.5 1005.7 1007.3 1008.2 1011.7 1001.8 999.0 1003.9 1005.1 1010.2 1010.0 1017.9 999.0 DAY 12 5 17 16 5 22 16 22 20 12 11 4 MEAN QFF PRESSURE IN HPA 1021.6 1017.9 1014.6 1010.2 1010.0 1002.4 996.0 1000.1 1006.8 1015.4 1017.5 1024.5 1011.4 MAX. QFF PRESSURE IN HPA 1030.8 1024.0 1026.0 1016.8 1016.9 1011.3 1000.5 1004.9 1015.3 1025.2 1027.6 1030.1 1030.8 DAY 7 13 3 7 29 1 4 25 22 27 28 10 MIN. QFF PRESSURE IN HPA 1015.7 1003.7 1004.2 1004.6 1005.7 993.0 989.7 994.7 998.5 1004.8 1007.0 1020.0 989.7 DAY 11 5 26 16 6 22 16 22 20 12 11 4 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 917.5 914.5 913.0 911.0 912.5 906.8 902.4 905.7 909.8 915.5 915.8 919.3 912.0 MAX. QFE PRESSURE IN HPA 925.1 919.6 921.5 915.5 918.1 913.7 906.2 909.5 915.5 924.8 922.0 925.2 925.2 DAY 7 13 3 12 29 1 4 25 22 25 15 10 MIN. QFE PRESSURE IN HPA 912.5 904.0 904.5 906.0 908.0 900.0 897.0 901.5 902.6 907.6 908.0 915.5 897.0 DAY 11 5 26 16 6 22 16 22 20 12 11 25 MEAN QNH PRESSURE IN HPA 1018.8 1015.5 1013.8 1011.7 1013.3 1007.1 1002.3 1005.9 1010.4 1016.6 1016.9 1020.8 1012.7 MAX. QNH PRESSURE IN HPA 1027.0 1021.0 1023.1 1016.6 1019.4 1014.6 1006.4 1010.0 1016.6 1026.7 1023.6 1027.1 1027.1 DAY 7 13 3 12 29 1 4 25 22 25 15 10 MIN. QNH PRESSURE IN HPA 1013.3 1004.0 1004.6 1006.2 1008.4 999.7 996.4 1001.3 1002.5 1008.0 1008.4 1016.6 996.4 DAY 11 5 26 16 6 22 16 22 20 12 11 25 MEAN QFF PRESSURE IN HPA 1019.7 1015.6 1012.3 1008.4 1008.2 1000.2 993.8 997.6 1004.3 1013.4 1015.8 1022.7 1009.3 MAX. QFF PRESSURE IN HPA 1028.2 1022.0 1023.2 1013.8 1016.3 1009.8 998.7 1002.3 1012.7 1024.3 1025.5 1029.0 1029.0 DAY 7 13 3 7 29 1 4 10 22 26 28 10 MIN. QFF PRESSURE IN HPA 1014.1 1001.6 1001.5 1002.6 1002.3 991.3 986.9 992.4 996.2 1002.9 1005.1 1018.3 986.9 DAY 11 5 26 16 6 22 16 22 20 12 11 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 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 917.9 914.8 912.9 911.2 912.3 906.3 901.4 904.9 909.5 915.5 916.3 919.8 911.9 MAX. QFE PRESSURE IN HPA 925.7 919.5 920.8 915.7 917.7 912.9 905.0 908.6 915.0 924.9 922.1 925.4 925.7 DAY 7 13 3 12 29 1 31 10 22 25 16 10 MIN. QFE PRESSURE IN HPA 912.5 906.3 904.5 905.5 907.5 900.8 896.3 900.8 904.9 908.6 908.1 916.0 896.3 DAY 11 5 25 16 5 22 16 22 19 12 25 25 MEAN QNH PRESSURE IN HPA 1019.2 1015.8 1013.8 1011.8 1013.1 1006.5 1001.2 1005.0 1010.1 1016.6 1017.4 1021.3 1012.7 MAX. QNH PRESSURE IN HPA 1027.7 1020.9 1022.3 1016.8 1019.0 1013.7 1005.1 1009.1 1016.0 1026.8 1023.8 1027.3 1027.7 DAY 7 13 3 12 29 1 31 10 22 25 16 10 MIN. QNH PRESSURE IN HPA 1013.3 1006.6 1004.6 1005.7 1007.9 1000.6 995.7 1000.6 1005.0 1009.1 1008.5 1017.1 995.7 DAY 11 5 25 16 5 22 16 22 19 12 25 25 MEAN QFF PRESSURE IN HPA 1021.1 1016.6 1012.9 1009.2 1008.5 999.8 992.9 997.2 1004.8 1014.4 1017.5 1024.1 1009.9 MAX. QFF PRESSURE IN HPA 1030.2 1022.4 1023.0 1014.5 1015.9 1008.9 996.7 1002.8 1012.9 1025.0 1026.6 1029.6 1030.2 DAY 7 13 3 7 29 1 3 10 22 26 28 10 MIN. QFF PRESSURE IN HPA 1014.7 1005.1 1002.2 1003.0 1002.5 993.1 986.7 992.7 998.5 1004.6 1008.2 1019.5 986.7 DAY 11 5 25 16 5 22 16 22 19 4 11 25 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 918.8 915.9 914.0 912.2 914.0 907.9 902.4 906.0 911.0 916.6 917.2 920.6 913.0 MAX. QFE PRESSURE IN HPA 925.7 920.6 921.2 917.0 918.5 914.2 907.3 910.0 917.0 925.2 923.0 925.8 925.8 DAY 7 13 2 6 28 1 3 24 21 25 15 10 MIN. QFE PRESSURE IN HPA 913.8 907.9 906.1 907.0 909.0 901.9 897.2 901.8 906.5 910.4 909.4 916.5 897.2 DAY 11 5 25 16 5 29 16 22 19 12 25 25 MEAN QNH PRESSURE IN HPA 1020.1 1017.0 1014.9 1013.0 1015.0 1008.3 1002.3 1006.3 1011.7 1017.7 1018.4 1022.1 1013.9 MAX. QNH PRESSURE IN HPA 1027.7 1022.1 1022.8 1018.2 1019.8 1015.2 1007.6 1010.6 1018.2 1027.1 1024.7 1027.8 1027.8 DAY 7 13 2 6 28 1 3 24 21 25 15 10 MIN. QNH PRESSURE IN HPA 1014.7 1008.3 1006.3 1007.3 1009.5 1001.8 996.6 1001.6 1006.8 1011.0 1009.9 1017.7 996.6 DAY 11 5 25 16 5 29 16 22 19 12 25 25 MEAN QFF PRESSURE IN HPA 1021.9 1017.9 1013.7 1009.5 1010.0 1001.4 993.7 998.1 1005.8 1015.1 1018.3 1025.1 1010.9 MAX. QFF PRESSURE IN HPA 1029.1 1023.8 1022.9 1016.5 1016.4 1009.4 999.6 1003.3 1014.0 1025.9 1027.4 1029.9 1029.9 DAY 7 13 2 6 29 1 3 24 21 26 28 10 MIN. QFF PRESSURE IN HPA 1016.3 1007.0 1002.7 1003.9 1003.6 993.5 987.0 992.7 999.6 1005.8 1009.7 1020.6 987.0 DAY 11 5 25 16 5 29 16 22 19 4 11 25 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 918.9 916.2 914.3 912.5 914.4 908.2 903.0 906.4 911.3 916.9 917.4 920.6 913.3 MAX. QFE PRESSURE IN HPA 925.2 921.1 921.8 917.0 919.0 913.6 908.4 910.9 917.8 925.4 923.4 925.8 925.8 DAY 7 13 2 6 28 1 3 24 21 25 27 10 MIN. QFE PRESSURE IN HPA 913.5 909.0 905.4 907.0 910.0 902.7 898.1 902.4 906.1 911.0 912.0 917.0 898.1 DAY 11 4 25 16 6 21 16 22 19 11 24 25 MEAN QNH PRESSURE IN HPA 1020.3 1017.4 1015.3 1013.3 1015.3 1008.6 1003.0 1006.7 1012.0 1018.1 1018.6 1022.1 1014.2 MAX. QNH PRESSURE IN HPA 1027.1 1022.7 1023.4 1018.2 1020.4 1014.5 1008.8 1011.6 1019.1 1027.3 1025.2 1027.8 1027.8 DAY 7 13 2 6 28 1 3 24 21 25 27 10 MIN. QNH PRESSURE IN HPA 1014.4 1009.5 1005.6 1007.3 1010.6 1002.6 997.6 1002.3 1006.3 1011.7 1012.8 1018.2 997.6 DAY 11 4 25 16 6 21 16 22 19 11 24 25 MEAN QFF PRESSURE IN HPA 1021.3 1017.5 1013.7 1009.8 1010.0 1001.6 994.4 998.3 1006.1 1014.9 1017.6 1024.2 1010.8 MAX. QFF PRESSURE IN HPA 1029.0 1023.6 1023.5 1016.3 1016.1 1008.5 1000.7 1004.1 1014.8 1025.8 1027.6 1029.8 1029.8 DAY 7 13 2 6 28 1 3 10 21 25 27 10 MIN. QFF PRESSURE IN HPA 1015.3 1007.8 1001.2 1003.6 1004.8 993.7 988.6 993.8 998.8 1005.7 1010.9 1020.5 988.6 DAY 16 4 25 16 6 29 16 22 19 11 24 3 ======================================================================================================================= 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 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 2.1 6.9 9.0 16.2 23.9 29.3 31.2 30.4 27.1 17.4 9.6 7.0 17.5 MINIMUN AIR TEMPERATURE (C) -2.4 2.1 4.4 9.8 15.6 20.2 22.5 20.2 17.1 8.2 2.1 -0.1 10.0 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 15 22 11 1 0 0 0 49 DAYS WITH MINIMUM TEMP. <=-4 13 0 0 0 0 0 0 0 0 0 3 5 21 DAYS WITH FREEZING MIN.<= 0 25 10 2 0 0 0 0 0 0 0 8 19 64 TEMPERATURE RECORDS LOWEST(C) -7.8 -2.0 -1.6 5.0 11.0 16.0 18.0 15.8 13.0 3.0 -5.0 -6.0 -7.8 DAY 15 14 1 4 1 18 18 5 28 20 19 3 MAXIMUM AIR TEMPERATURE (C) 8.0 12.8 14.4 23.4 32.0 37.5 38.7 39.2 36.7 26.7 17.7 15.3 25.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 2 18 30 31 31 30 6 0 0 148 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 15.4 19.8 27.0 31.0 38.0 42.0 42.0 42.0 40.0 32.0 23.5 21.6 42.0 DAY 8 20 31 22 31 4 3 10 10 14 3 27 DIF. BETWEEN (MAX.-MIN.) (C) 10.4 10.7 10.0 13.6 16.4 17.3 16.2 19.0 19.6 18.5 15.6 15.4 15.2 MEAN DAILY TEMP. (MDT) (C) 2.8 7.4 9.4 16.6 23.8 28.9 30.6 29.7 26.9 17.5 9.9 7.6 17.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 1.6 89.7 236.5 297.6 268.9 177.1 3.6 0.0 0.0 1075.2 HEATING DEG. DAYS(BASE 18 0C) 470.4 306.7 266.8 61.5 0.0 0.0 0.0 0.0 0.0 42.3 242.0 321.3 1710.9 DEWPOINT (MEAN C) -2.8 1.4 2.5 4.1 7.6 4.1 6.8 8.0 3.2 0.6 -2.0 -4.6 2.4 MIXING RATIO (G/KG) 3.47 4.70 5.21 5.93 7.39 6.05 7.04 7.88 5.41 4.57 3.75 3.16 5.38 VAPOUR PRESSURE (HPA) 5.10 6.86 7.58 8.61 10.72 8.74 10.17 11.36 7.85 6.69 5.52 4.64 7.82 SATURATION DEF. (HPA) 2.35 3.53 4.47 10.84 20.72 34.19 37.02 34.62 30.67 14.69 7.29 6.03 17.20 RELATIVE HUMIDITY (MEAN %) 73 71 68 51 41 24 24 28 24 36 47 48 45 RELATIVE HUMIDITY (MAX. %) 88 90 88 78 67 43 41 46 40 58 66 69 65 RELATIVE HUMIDITY (MIN. %) 51 46 45 27 20 12 12 16 13 18 29 24 26 RELATIVE HUMIDITY (MEAN% 03UTC) 85 86 83 72 64 40 40 45 37 55 64 63 61 RELATIVE HUMIDITY (MEAN% 09UTC) 57 55 52 34 24 16 16 21 15 22 34 30 31 RELATIVE HUMIDITY (MEAN% 15UTC) 69 61 61 41 28 14 15 19 16 26 40 39 36 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 30.8 57.3 64.4 38.1 6.2 2.0 0.4 0.0 0.0 3.0 3.0 1.0 206.2 DAYS WITH PRECIPITATION >=10 0 3 1 1 0 0 0 0 0 0 0 0 5 DAYS WITH PRECIPITATION >= 5 4 4 4 2 0 0 0 0 0 0 0 0 14 DAYS WITH PRECIPITATION >= 1 6 10 12 6 3 1 0 0 0 1 1 1 41 DAYS WITH PRECIPITATION 9 13 15 9 6 1 1 0 0 2 1 1 58 GREATEST DAILY PRECIPITATION 7.6 17.2 20.0 23.5 2.0 2.0 0.4 0.0 0.0 3.0 3.0 1.0 23.5 DAY 6 5 2 3 12 26 10 ** ** 16 16 22 DAY WITH THUNDER STORM 0 0 0 1 3 0 0 0 0 0 0 0 4 DAYS WITH SNOW OR SLEET 6 3 0 0 0 0 0 0 0 0 0 0 9 DAYS WITH DUST 1 1 0 1 0 0 3 0 4 1 1 0 12 WIND DIRECTION (PREVAILING) 270 270 270 315 315 90 90 90 270 90 90 270 90 PREVAILING WIND SPEED(KNOTS) 5.5 8.0 8.2 9.9 7.7 9.1 9.9 9.4 7.5 7.4 6.9 7.4 8.6 PREVAILING WIND PERCENT 12.9 20.7 14.9 20.0 14.9 26.3 36.7 33.1 14.6 10.9 7.5 15.3 13.1 CALMS PERCENT OF WIND 71.4 56.5 55.6 46.7 50.0 37.5 46.0 41.9 63.3 64.5 76.3 69.4 56.6 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 293 288 297 313 316 86 90 91 283 331 359 285 357 VECTOR WIND MAGNITUDE(KNOTS) 0.8 1.6 1.6 2.8 1.2 1.5 4.2 3.0 0.7 0.4 0.4 1.5 0.5 WIND STEADINESES (MEAN %) 47.1 48.5 43.2 57.1 30.0 25.4 84.0 62.5 26.9 15.4 23.5 62.5 13.9 WIND SPEED (MEAN KNOTS) 1.7 3.3 3.7 4.9 4.0 5.9 5.0 4.8 2.6 2.6 1.7 2.4 3.6 FASTEST WIND DIRECTION 330 300 310 300 310 240 90 90 270 320 300 300 310 FASTEST WIND SPEED (KNOTS) 17 19 27 23 23 27 23 19 16 23 16 19 27 DAY 8 11 14 10 1 5 4 30 19 14 11 15 DAYS WITH SKY CLEAR (0-2)/8 11 11 10 12 19 27 27 29 29 26 19 15 235 DAYS WITH P.CLOUDY (3-6)/8 12 10 9 12 11 2 4 2 1 5 9 14 91 DAYS WITH CLOUDY (7-8)/8 8 8 12 6 1 1 0 0 0 0 2 2 40 DAYS WITH VISIBILITY =< 2 KM 2 1 0 0 0 0 0 0 0 0 0 0 3 DURATION OF SUNSHINE HOURS 157.7 165.8 166.9 222.0 303.9 355.2 360.0 352.2 290.5 294.6 201.5 206.9 3077.2 ======================================================================================================================= 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 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 920.0 915.3 913.5 914.1 912.9 908.5 909.3 909.1 909.9 916.8 921.5 920.2 914.3 MAX. QFE PRESSURE IN HPA 928.1 923.0 918.8 922.5 919.0 914.8 916.2 918.6 920.0 926.4 933.0 928.2 933.0 DAY-HOUR 26- 6 13- 6 29- 6 4- 6 7- 6 12- 3 4- 6 30- 6 25- 6 2- 6 18- 6 2- 6 MIN. QFE PRESSURE IN HPA 910.3 906.4 907.1 905.0 904.7 902.0 900.8 902.0 903.2 906.6 914.2 912.9 900.8 DAY-HOUR 6-12 10-12 25-21 13-12 29-15 19-15 6-15 8-12 21-15 27-12 6-15 25-12 MEAN QNH PRESSURE IN HPA 1021.5 1016.4 1014.3 1015.0 1013.7 1008.9 1009.8 1009.6 1010.5 1017.9 1023.1 1021.7 1015.2 MAX. QNH PRESSURE IN HPA 1030.3 1024.7 1020.2 1024.2 1020.4 1015.8 1017.3 1019.9 1021.5 1028.4 1035.6 1030.4 1035.6 DAY-HOUR 26- 6 13- 6 29- 6 4- 6 7- 6 12- 3 4- 6 30- 6 25- 6 2- 6 18- 6 2- 6 MIN. QNH PRESSURE IN HPA 1010.9 1006.7 1007.4 1005.1 1004.8 1001.9 1000.6 1001.9 1003.2 1006.9 1015.2 1013.7 1000.6 DAY-HOUR 6-12 10-12 25-21 13-12 29-15 19-15 6-15 8-12 21-15 27-12 6-15 25-12 MEAN QFF PRESSURE IN HPA 1024.4 1017.2 1014.4 1012.3 1008.3 1001.7 1002.0 1002.0 1004.1 1015.0 1023.2 1022.7 1012.3 MAX. QFF PRESSURE IN HPA 1034.2 1026.4 1021.5 1025.2 1016.4 1009.9 1008.8 1013.5 1016.3 1026.4 1037.8 1034.2 1037.8 DAY-HOUR 26- 6 13- 6 1- 6 4- 6 7- 6 12- 6 4- 6 30- 6 25- 6 19- 3 18- 6 3- 6 MIN. QFF PRESSURE IN HPA 1011.8 1005.7 1005.2 1001.0 998.1 994.7 992.4 993.8 997.0 1002.8 1013.7 1012.6 992.4 DAY-HOUR 6-12 10-12 26- 0 13-12 29-12 19-15 7-15 8-12 8-15 27-12 6-12 25-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 920.0 915.0 913.2 914.1 913.2 908.8 909.3 909.2 910.2 916.9 921.5 920.2 914.3 MAX. QFE PRESSURE IN HPA 927.0 920.5 918.5 922.0 917.0 914.6 915.0 917.0 918.0 924.3 931.4 927.0 931.4 DAY 26 24 29 5 7 12 4 30 25 19 19 8 MIN. QFE PRESSURE IN HPA 914.3 907.2 907.1 907.7 908.3 905.0 902.3 904.0 904.7 909.0 915.3 914.3 902.3 DAY 7 11 26 10 25 19 7 8 22 27 29 25 MEAN QNH PRESSURE IN HPA 1021.4 1016.0 1014.1 1015.0 1014.0 1009.3 1009.9 1009.7 1010.8 1018.1 1023.1 1021.7 1015.2 MAX. QNH PRESSURE IN HPA 1029.1 1022.0 1019.8 1023.6 1018.2 1015.6 1016.0 1018.2 1019.3 1026.1 1033.9 1029.1 1033.9 DAY 26 24 29 5 7 12 4 30 25 19 19 8 MIN. QNH PRESSURE IN HPA 1015.3 1007.5 1007.4 1008.1 1008.7 1005.1 1002.2 1004.0 1004.8 1009.5 1016.3 1015.3 1002.2 DAY 7 11 26 10 25 19 7 8 22 27 29 25 MEAN QFF PRESSURE IN HPA 1023.9 1016.6 1013.9 1012.1 1008.5 1002.0 1001.9 1001.9 1004.1 1014.7 1022.7 1022.1 1012.0 MAX. QFF PRESSURE IN HPA 1031.9 1022.8 1019.8 1024.1 1013.6 1009.3 1006.8 1011.0 1014.2 1023.8 1035.5 1031.5 1035.5 DAY 26 4 29 5 8 12 4 30 25 19 19 4 MIN. QFF PRESSURE IN HPA 1016.1 1006.2 1005.2 1003.9 1001.7 997.5 993.6 996.1 998.7 1005.5 1015.1 1014.2 993.6 DAY 5 11 26 13 29 5 7 8 22 27 7 25 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 920.0 915.4 913.7 914.8 914.0 910.0 910.6 910.5 911.3 917.7 922.1 920.5 915.0 MAX. QFE PRESSURE IN HPA 927.0 921.2 918.5 922.0 918.3 914.8 915.5 918.0 919.0 925.3 931.6 927.1 931.6 DAY 26 24 29 5 7 12 4 30 25 2 19 4 MIN. QFE PRESSURE IN HPA 914.0 908.0 907.6 907.2 909.4 905.3 903.6 905.5 905.1 909.0 915.5 914.0 903.6 DAY 5 2 13 13 29 19 7 8 22 27 29 25 MEAN QNH PRESSURE IN HPA 1021.5 1016.4 1014.6 1015.8 1014.9 1010.6 1011.3 1011.2 1012.0 1018.9 1023.7 1022.0 1016.1 MAX. QNH PRESSURE IN HPA 1029.1 1022.8 1019.8 1023.6 1019.6 1015.8 1016.6 1019.3 1020.4 1027.2 1034.1 1029.2 1034.1 DAY 26 24 29 5 7 12 4 30 25 2 19 4 MIN. QNH PRESSURE IN HPA 1014.9 1008.4 1008.0 1007.5 1009.9 1005.5 1003.6 1005.7 1005.2 1009.5 1016.6 1014.9 1003.6 DAY 5 2 13 13 29 19 7 8 22 27 29 25 MEAN QFF PRESSURE IN HPA 1024.7 1017.5 1015.0 1013.2 1010.0 1003.7 1003.7 1004.0 1006.1 1016.7 1024.3 1023.5 1013.5 MAX. QFF PRESSURE IN HPA 1033.0 1024.5 1020.8 1023.2 1015.8 1009.9 1007.8 1013.0 1016.0 1026.4 1037.2 1032.5 1037.2 DAY 26 13 29 4 7 27 22 30 25 19 19 4 MIN. QFF PRESSURE IN HPA 1015.4 1009.2 1007.9 1003.7 1003.8 998.5 995.2 998.6 999.2 1007.1 1016.4 1015.0 995.2 DAY 5 2 13 13 29 19 7 8 22 27 29 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 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 921.4 916.8 914.8 915.7 914.5 910.6 911.4 911.4 912.1 918.8 923.2 921.8 916.0 MAX. QFE PRESSURE IN HPA 928.1 923.0 918.8 922.5 919.0 914.6 916.2 918.6 920.0 926.4 933.0 928.2 933.0 DAY 26 13 29 4 7 12 4 30 25 2 18 2 MIN. QFE PRESSURE IN HPA 914.5 908.2 909.3 907.9 909.1 905.5 904.7 906.0 906.5 910.0 916.1 915.6 904.7 DAY 6 5 13 13 29 19 7 8 22 27 29 25 MEAN QNH PRESSURE IN HPA 1023.0 1018.0 1015.8 1016.8 1015.5 1011.2 1012.1 1012.2 1012.8 1020.2 1025.0 1023.4 1017.2 MAX. QNH PRESSURE IN HPA 1030.3 1024.7 1020.2 1024.2 1020.4 1015.6 1017.3 1019.9 1021.5 1028.4 1035.6 1030.4 1035.6 DAY 26 13 29 4 7 12 4 30 25 2 18 2 MIN. QNH PRESSURE IN HPA 1015.5 1008.6 1009.8 1008.3 1009.6 1005.7 1004.8 1006.2 1006.8 1010.6 1017.2 1016.7 1004.8 DAY 6 5 13 13 29 19 7 8 22 27 29 25 MEAN QFF PRESSURE IN HPA 1026.4 1019.1 1016.0 1014.2 1010.2 1004.1 1004.2 1004.4 1006.5 1017.2 1025.3 1025.0 1014.4 MAX. QFF PRESSURE IN HPA 1034.2 1026.4 1021.5 1025.2 1016.4 1009.9 1008.8 1013.5 1016.3 1026.2 1037.8 1034.2 1037.8 DAY 26 13 1 4 7 12 4 30 25 19 18 3 MIN. QFF PRESSURE IN HPA 1016.8 1010.9 1009.7 1004.8 1002.9 997.7 996.5 998.3 1001.1 1006.7 1016.9 1016.1 996.5 DAY 6 2 26 13 29 5 7 8 8 27 8 25 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 920.4 916.0 913.9 914.6 913.2 909.2 910.1 910.0 910.4 917.0 921.7 920.5 914.7 MAX. QFE PRESSURE IN HPA 926.4 922.3 917.0 922.2 917.5 913.1 914.5 917.0 919.0 924.1 931.5 927.0 931.5 DAY 10 13 29 5 7 12 4 29 25 19 18 7 MIN. QFE PRESSURE IN HPA 912.6 907.8 908.5 906.5 907.1 904.0 903.2 904.3 905.7 907.8 915.2 914.6 903.2 DAY 6 5 13 13 29 19 7 8 21 27 29 25 MEAN QNH PRESSURE IN HPA 1021.9 1017.1 1014.8 1015.6 1014.1 1009.7 1010.7 1010.5 1011.0 1018.2 1023.3 1022.0 1015.7 MAX. QNH PRESSURE IN HPA 1028.4 1024.0 1018.2 1023.9 1018.7 1014.0 1015.5 1018.2 1020.4 1025.9 1034.0 1029.1 1034.0 DAY 10 13 29 5 7 12 4 29 25 19 18 7 MIN. QNH PRESSURE IN HPA 1013.4 1008.2 1008.9 1006.8 1007.4 1004.0 1003.2 1004.4 1005.9 1008.2 1016.2 1015.6 1003.2 DAY 6 5 13 13 29 19 7 8 21 27 29 25 MEAN QFF PRESSURE IN HPA 1024.6 1017.7 1014.7 1012.9 1008.4 1002.3 1002.8 1002.7 1004.3 1014.8 1022.9 1022.6 1012.5 MAX. QFF PRESSURE IN HPA 1031.3 1025.1 1020.1 1024.3 1014.3 1008.2 1007.0 1011.3 1015.1 1024.1 1035.9 1031.3 1035.9 DAY 26 13 1 5 7 12 4 30 25 19 19 8 MIN. QFF PRESSURE IN HPA 1014.5 1008.5 1008.1 1003.1 1000.3 995.2 994.7 996.3 999.1 1004.1 1014.9 1014.7 994.7 DAY 6 10 26 13 29 5 7 8 8 27 29 25 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 919.0 914.3 912.5 912.9 911.3 906.9 908.2 907.9 908.3 915.1 920.2 918.9 912.9 MAX. QFE PRESSURE IN HPA 925.6 920.0 915.2 921.0 916.0 911.7 912.3 915.0 916.5 922.8 930.0 925.5 930.0 DAY 10 13 28 4 7 27 3 29 25 19 18 7 MIN. QFE PRESSURE IN HPA 910.3 906.4 907.6 905.0 905.1 903.0 901.0 902.0 903.7 906.6 914.4 912.9 901.0 DAY 6 10 13 13 29 19 6 8 21 27 6 25 MEAN QNH PRESSURE IN HPA 1020.3 1015.3 1013.3 1013.7 1012.0 1007.2 1008.6 1008.3 1008.7 1016.1 1021.7 1020.3 1013.8 MAX. QNH PRESSURE IN HPA 1027.6 1021.5 1016.2 1022.6 1017.1 1012.4 1013.1 1016.0 1017.7 1024.5 1032.4 1027.5 1032.4 DAY 10 13 28 4 7 27 3 29 25 19 18 7 MIN. QNH PRESSURE IN HPA 1010.9 1006.7 1008.0 1005.1 1005.2 1003.0 1000.8 1001.9 1003.7 1006.9 1015.4 1013.7 1000.8 DAY 6 10 13 13 29 19 6 8 21 27 6 25 MEAN QFF PRESSURE IN HPA 1022.8 1015.8 1013.1 1010.9 1006.5 1000.0 1000.7 1000.4 1002.0 1012.8 1021.3 1020.7 1010.6 MAX. QFF PRESSURE IN HPA 1030.4 1022.4 1018.3 1023.2 1012.8 1006.3 1004.9 1009.6 1012.1 1022.5 1033.8 1029.6 1033.8 DAY 10 13 1 5 7 27 21 30 25 19 18 3 MIN. QFF PRESSURE IN HPA 1011.8 1005.7 1006.4 1001.0 998.1 995.3 992.5 993.8 997.1 1002.8 1013.7 1012.6 992.5 DAY 6 10 26 13 29 5 6 8 8 27 6 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 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 919.5 914.6 912.7 912.7 911.1 906.3 907.4 907.1 908.0 915.4 920.6 919.4 912.9 MAX. QFE PRESSURE IN HPA 926.2 919.5 917.3 920.5 915.0 911.0 911.4 914.3 916.0 922.6 931.0 926.0 931.0 DAY 9 23 28 5 7 27 3 30 25 19 18 3 MIN. QFE PRESSURE IN HPA 912.4 907.0 908.2 905.8 904.7 902.0 900.8 902.0 903.2 908.7 914.2 914.3 900.8 DAY 6 10 25 13 29 19 6 8 21 27 6 24 MEAN QNH PRESSURE IN HPA 1020.9 1015.6 1013.6 1013.5 1011.8 1006.5 1007.7 1007.5 1008.4 1016.5 1022.2 1020.8 1013.7 MAX. QNH PRESSURE IN HPA 1028.2 1020.9 1018.5 1022.0 1016.0 1011.7 1012.1 1015.3 1017.1 1024.3 1033.4 1028.0 1033.4 DAY 9 23 28 5 7 27 3 30 25 19 18 3 MIN. QNH PRESSURE IN HPA 1013.2 1007.3 1008.6 1006.0 1004.8 1001.9 1000.6 1001.9 1003.2 1009.2 1015.2 1015.3 1000.6 DAY 6 10 25 13 29 19 6 8 21 27 6 24 MEAN QFF PRESSURE IN HPA 1024.1 1016.7 1013.8 1010.8 1006.9 999.7 1000.2 1000.2 1002.5 1014.2 1022.7 1022.3 1011.2 MAX. QFF PRESSURE IN HPA 1031.4 1022.5 1019.2 1022.8 1011.8 1006.2 1003.6 1009.3 1012.3 1023.6 1035.9 1031.5 1035.9 DAY 9 13 28 5 6 27 3 30 25 19 18 3 MIN. QFF PRESSURE IN HPA 1014.4 1007.1 1006.9 1002.6 998.3 994.7 992.4 994.7 997.0 1007.0 1014.5 1014.8 992.4 DAY 6 10 25 13 29 19 7 8 8 27 6 25 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 920.1 915.4 913.5 914.1 912.7 907.8 908.6 908.3 909.5 916.6 921.5 920.2 914.0 MAX. QFE PRESSURE IN HPA 926.5 920.2 918.4 921.5 917.0 913.0 913.0 916.5 917.0 923.7 931.6 927.0 931.6 DAY 9 23 28 4 7 27 3 29 25 18 18 3 MIN. QFE PRESSURE IN HPA 912.9 908.1 908.7 908.0 907.3 904.0 901.5 903.3 904.5 910.5 915.2 914.5 901.5 DAY 6 10 25 10 29 19 6 8 21 5 6 24 MEAN QNH PRESSURE IN HPA 1021.6 1016.4 1014.4 1015.0 1013.6 1008.2 1009.0 1008.7 1010.0 1017.8 1023.1 1021.6 1015.0 MAX. QNH PRESSURE IN HPA 1028.5 1021.7 1019.7 1023.1 1018.2 1013.8 1013.8 1017.7 1018.2 1025.5 1034.1 1029.1 1034.1 DAY 9 23 28 4 7 27 3 29 25 18 18 3 MIN. QNH PRESSURE IN HPA 1013.7 1008.5 1009.2 1008.4 1007.6 1004.0 1001.3 1003.3 1004.6 1011.1 1016.2 1015.5 1001.3 DAY 6 10 25 10 29 19 6 8 21 5 6 24 MEAN QFF PRESSURE IN HPA 1025.0 1017.5 1014.5 1012.4 1008.1 1000.9 1001.1 1001.0 1003.7 1014.8 1023.4 1023.2 1012.1 MAX. QFF PRESSURE IN HPA 1032.3 1024.1 1019.8 1024.0 1013.4 1007.7 1005.1 1010.5 1012.8 1023.8 1036.1 1032.8 1036.1 DAY 25 3 28 4 7 27 3 29 25 19 18 3 MIN. QFF PRESSURE IN HPA 1015.5 1008.6 1008.1 1005.5 1000.6 996.3 993.0 995.3 998.4 1007.4 1015.8 1015.1 993.0 DAY 6 10 25 12 29 19 6 8 8 26 6 25 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 920.1 915.3 913.5 914.1 913.2 908.3 909.0 908.8 909.9 916.8 921.6 920.2 914.2 MAX. QFE PRESSURE IN HPA 927.0 920.5 918.6 921.5 917.0 914.0 914.0 917.0 917.0 923.5 931.4 927.1 931.4 DAY 25 23 28 4 5 26 3 29 25 18 18 3 MIN. QFE PRESSURE IN HPA 913.5 907.7 907.1 908.3 908.1 904.8 902.0 904.0 905.2 909.8 915.3 914.3 902.0 DAY 6 10 25 9 29 18 6 7 19 26 28 24 MEAN QNH PRESSURE IN HPA 1021.5 1016.4 1014.4 1015.1 1014.0 1008.8 1009.5 1009.3 1010.5 1018.0 1023.2 1021.7 1015.2 MAX. QNH PRESSURE IN HPA 1029.1 1022.0 1019.9 1023.1 1018.2 1014.9 1014.9 1018.2 1018.2 1025.3 1033.9 1029.2 1033.9 DAY 25 23 28 4 5 26 3 29 25 18 18 3 MIN. QNH PRESSURE IN HPA 1014.4 1008.1 1007.4 1008.7 1008.5 1004.9 1001.9 1004.0 1005.4 1010.4 1016.3 1015.3 1001.9 DAY 6 10 25 9 29 18 6 7 19 26 28 24 MEAN QFF PRESSURE IN HPA 1024.2 1017.0 1014.1 1012.3 1008.2 1001.3 1001.5 1001.5 1003.8 1014.7 1022.9 1022.3 1012.0 MAX. QFF PRESSURE IN HPA 1032.1 1023.6 1019.7 1023.8 1014.1 1008.7 1005.9 1010.9 1012.8 1023.8 1035.7 1031.5 1035.7 DAY 25 3 28 4 5 26 3 29 24 19 18 3 MIN. QFF PRESSURE IN HPA 1015.8 1006.9 1005.5 1005.2 1001.4 996.8 992.9 996.1 998.6 1006.4 1015.1 1014.8 992.9 DAY 6 10 25 12 29 5 6 7 8 26 6 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 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.5 5.2 9.8 17.8 23.8 30.3 34.1 31.9 25.3 20.7 10.8 6.2 18.5 MINIMUN AIR TEMPERATURE (C) -1.8 -3.1 3.0 9.3 14.8 21.4 24.7 20.6 15.3 11.9 4.4 0.8 10.1 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 18 31 15 1 0 0 0 66 DAYS WITH MINIMUM TEMP. <=-4 10 14 1 0 0 0 0 0 0 0 0 2 27 DAYS WITH FREEZING MIN.<= 0 21 23 8 0 0 0 0 0 0 0 5 14 71 TEMPERATURE RECORDS LOWEST(C) -8.8 -11.2 -6.0 0.4 9.0 16.0 21.0 15.0 10.0 7.0 -1.0 -5.4 -11.2 DAY 29 8 9 12 7 4 14 29 16 30 29 29 MAXIMUM AIR TEMPERATURE (C) 13.9 14.0 17.0 25.9 31.8 37.9 42.0 41.4 34.7 29.6 18.1 12.4 26.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 7 24 30 31 31 29 18 0 0 170 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 21.6 21.0 24.0 34.0 39.0 41.0 45.0 45.5 41.0 35.0 25.0 17.0 45.5 DAY 6 22 22 26 28 17 18 14 1 4 5 5 DIF. BETWEEN (MAX.-MIN.) (C) 15.7 17.1 14.0 16.6 17.0 16.5 17.3 20.8 19.4 17.7 13.7 11.6 16.5 MEAN DAILY TEMP. (MDT) (C) 6.1 5.5 10.0 17.6 23.3 29.6 33.4 31.0 25.0 20.8 11.3 6.6 18.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 8.3 80.4 259.2 383.2 308.9 119.2 28.5 0.0 0.0 1187.8 HEATING DEG. DAYS(BASE 18 0C) 369.9 350.6 248.1 52.6 0.0 0.0 0.0 0.0 0.0 3.8 202.4 352.3 1579.8 DEWPOINT (MEAN C) -6.1 -8.8 -3.9 -1.0 2.3 5.0 6.6 2.7 1.2 1.6 0.6 1.0 0.1 MIXING RATIO (G/KG) 2.71 2.35 3.34 4.18 5.18 6.24 6.98 5.32 4.70 4.85 4.55 4.61 4.58 VAPOUR PRESSURE (HPA) 3.97 3.44 4.87 6.07 7.54 9.02 10.03 7.70 6.85 7.09 6.67 6.75 6.67 SATURATION DEF. (HPA) 5.75 6.36 8.00 15.92 23.83 35.91 45.60 42.69 27.65 18.96 6.95 3.06 20.06 RELATIVE HUMIDITY (MEAN %) 47 39 42 33 28 23 20 18 24 31 53 72 36 RELATIVE HUMIDITY (MAX. %) 67 62 66 54 49 40 35 33 40 50 73 89 55 RELATIVE HUMIDITY (MIN. %) 26 20 24 16 14 12 11 9 12 17 32 50 20 RELATIVE HUMIDITY (MEAN% 03UTC) 64 59 57 51 44 38 34 32 40 47 69 88 52 RELATIVE HUMIDITY (MEAN% 09UTC) 33 26 30 22 18 16 15 12 14 20 37 58 25 RELATIVE HUMIDITY (MEAN% 15UTC) 36 27 32 23 19 15 12 10 15 23 45 65 27 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 3.6 2.0 14.2 12.2 4.7 5.1 0.0 0.0 0.0 2.3 12.0 20.0 76.1 DAYS WITH PRECIPITATION >=10 0 0 0 0 0 0 0 0 0 0 0 1 1 DAYS WITH PRECIPITATION >= 5 0 0 1 0 0 0 0 0 0 0 0 1 2 DAYS WITH PRECIPITATION >= 1 1 1 6 4 3 1 0 0 0 2 4 5 27 DAYS WITH PRECIPITATION 2 1 7 5 4 5 0 0 0 3 4 6 37 GREATEST DAILY PRECIPITATION 3.2 2.0 7.0 4.0 2.0 4.0 0.0 0.0 0.0 1.0 4.0 10.0 10.0 DAY 28 19 29 5 21 15 ** ** ** 12 3 14 DAY WITH THUNDER STORM 0 0 0 0 2 3 0 0 0 0 0 0 5 DAYS WITH SNOW OR SLEET 1 0 1 0 0 0 0 0 0 0 0 0 2 DAYS WITH DUST 1 0 2 2 0 2 0 0 0 1 3 2 13 WIND DIRECTION (PREVAILING) 270 270 270 270 270 90 90 90 270 270 90 270 270 PREVAILING WIND SPEED(KNOTS) 9.1 10.1 10.0 11.2 8.7 11.1 9.4 8.4 7.8 7.6 5.8 6.4 8.9 PREVAILING WIND PERCENT 10.9 21.0 25.8 16.3 21.4 14.6 34.3 34.7 15.0 17.3 4.6 6.5 12.9 CALMS PERCENT OF WIND 71.0 55.4 44.8 50.0 44.8 38.3 50.4 52.0 52.9 61.3 83.3 86.3 57.6 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 293 293 279 283 285 13 85 87 308 289 26 291 306 VECTOR WIND MAGNITUDE(KNOTS) 1.5 2.4 3.2 3.2 2.4 0.4 3.4 3.5 1.2 2.0 0.3 0.6 0.9 WIND STEADINESES (MEAN %) 60.0 57.1 60.4 66.7 48.0 7.0 77.3 87.5 32.4 69.0 33.3 66.7 24.3 WIND SPEED (MEAN KNOTS) 2.5 4.2 5.3 4.8 5.0 5.7 4.4 4.0 3.7 2.9 0.9 0.9 3.7 FASTEST WIND DIRECTION 270 290 270 290 290 270 90 90 270 320 330 330 270 FASTEST WIND SPEED (KNOTS) 23 29 33 29 29 33 23 17 23 23 12 14 33 DAY 31 6 7 28 21 16 3 1 26 7 1 11 DAYS WITH SKY CLEAR (0-2)/8 21 23 10 14 17 18 24 31 30 20 11 16 235 DAYS WITH P.CLOUDY (3-6)/8 8 5 15 14 13 11 7 0 0 8 9 6 96 DAYS WITH CLOUDY (7-8)/8 2 0 6 2 1 1 0 0 0 3 10 9 34 DAYS WITH VISIBILITY =< 2 KM 0 0 1 0 0 1 0 0 0 0 0 2 4 DURATION OF SUNSHINE HOURS 217.7 267.2 212.2 259.2 308.8 325.6 352.4 361.0 320.3 259.5 173.8 162.4 3220.1 ======================================================================================================================= 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 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 916.3 916.8 912.1 912.0 913.4 908.2 904.0 907.5 912.9 916.1 919.3 918.0 913.1 MAX. QFE PRESSURE IN HPA 925.9 925.5 927.2 920.0 920.8 914.2 910.2 914.2 920.0 923.0 930.2 927.5 930.2 DAY-HOUR 19- 6 7- 6 11- 6 13- 6 12- 6 8- 6 9- 6 25- 6 15- 6 9- 6 8- 6 28- 6 MIN. QFE PRESSURE IN HPA 905.4 908.2 900.6 902.5 903.8 900.5 897.4 900.0 904.0 910.4 913.2 908.0 897.4 DAY-HOUR 16-12 22-15 29-12 10-12 4-12 30-15 16-15 5-15 2-15 6-12 20-12 10- 3 MEAN QNH PRESSURE IN HPA 1017.5 1018.0 1012.9 1012.7 1014.2 1008.6 1004.1 1007.9 1013.7 1017.2 1020.7 1019.3 1013.9 MAX. QNH PRESSURE IN HPA 1027.9 1027.5 1029.3 1021.5 1022.3 1015.2 1010.8 1015.2 1021.5 1024.7 1032.6 1029.6 1032.6 DAY-HOUR 19- 6 7- 6 11- 6 13- 6 12- 6 8- 6 9- 6 25- 6 15- 6 9- 6 8- 6 28- 6 MIN. QNH PRESSURE IN HPA 1005.6 1008.6 1000.3 1002.4 1003.8 1000.2 996.9 999.7 1004.0 1011.0 1014.1 1008.4 996.9 DAY-HOUR 16-12 22-15 29-12 10-12 4-12 30-15 16-15 5-15 2-15 6-12 20-12 10- 3 MEAN QFF PRESSURE IN HPA 1019.0 1019.7 1012.7 1009.6 1009.0 1001.1 995.3 999.9 1008.0 1013.1 1020.1 1020.4 1010.6 MAX. QFF PRESSURE IN HPA 1031.5 1032.3 1030.5 1021.5 1018.5 1007.9 1002.6 1007.9 1017.7 1021.2 1031.8 1032.8 1032.8 DAY-HOUR 19- 6 7- 6 11- 6 12- 6 7- 6 7- 3 9- 6 28- 6 15- 6 9- 6 8- 6 28- 6 MIN. QFF PRESSURE IN HPA 1005.2 1007.5 998.5 998.9 998.2 992.5 987.8 991.3 996.4 1005.3 1012.5 1009.2 987.8 DAY-HOUR 16-12 22-12 7-12 10-12 4-12 30-15 15-21 14-12 2-12 7- 0 5-12 10-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 916.6 916.7 912.1 911.9 913.9 908.6 904.3 907.5 913.1 916.2 919.3 918.0 913.2 MAX. QFE PRESSURE IN HPA 923.5 924.0 923.0 918.0 919.2 912.4 908.4 911.6 918.0 921.0 928.6 926.0 928.6 DAY 24 8 12 13 12 1 8 29 19 9 8 29 MIN. QFE PRESSURE IN HPA 907.4 910.8 904.8 905.5 907.3 903.6 898.6 902.5 907.1 911.0 915.2 909.0 898.6 DAY 17 27 25 10 5 30 16 6 3 7 19 10 MEAN QNH PRESSURE IN HPA 1017.8 1017.9 1012.9 1012.7 1014.8 1009.1 1004.4 1007.9 1013.9 1017.3 1020.7 1019.3 1014.0 MAX. QNH PRESSURE IN HPA 1025.3 1025.8 1024.7 1019.3 1020.6 1013.2 1008.8 1012.3 1019.3 1022.6 1030.8 1028.0 1030.8 DAY 24 8 12 13 12 1 8 29 19 9 8 29 MIN. QNH PRESSURE IN HPA 1007.7 1011.5 1004.9 1005.7 1007.6 1003.6 998.2 1002.4 1007.4 1011.7 1016.2 1009.5 998.2 DAY 17 27 25 10 5 30 16 6 3 7 19 10 MEAN QFF PRESSURE IN HPA 1018.7 1019.1 1012.5 1009.4 1009.6 1001.4 995.5 999.7 1007.8 1012.8 1019.8 1020.1 1010.5 MAX. QFF PRESSURE IN HPA 1026.8 1029.6 1025.8 1019.2 1016.3 1006.1 1001.2 1005.5 1014.3 1018.8 1029.9 1031.1 1031.1 DAY 20 8 11 12 7 1 8 29 15 9 8 29 MIN. QFF PRESSURE IN HPA 1008.2 1009.8 1001.3 1001.1 1002.7 995.8 988.9 993.8 999.4 1005.3 1014.9 1010.0 988.9 DAY 17 22 25 10 5 30 16 15 3 7 19 10 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 916.8 917.5 912.8 912.9 914.8 909.9 905.7 909.2 914.3 916.9 919.8 918.1 914.1 MAX. QFE PRESSURE IN HPA 924.1 923.0 925.0 919.0 920.4 914.0 909.8 912.6 919.2 921.5 929.2 926.3 929.2 DAY 19 8 11 13 12 8 9 25 15 9 8 29 MIN. QFE PRESSURE IN HPA 906.1 911.4 903.9 905.9 908.5 905.0 900.8 904.0 908.4 912.8 915.2 908.0 900.8 DAY 16 22 25 5 5 30 16 6 3 7 19 10 MEAN QNH PRESSURE IN HPA 1017.9 1018.8 1013.7 1013.7 1015.8 1010.5 1005.9 1009.8 1015.2 1018.1 1021.2 1019.4 1015.0 MAX. QNH PRESSURE IN HPA 1025.9 1024.7 1026.9 1020.4 1021.9 1014.9 1010.4 1013.4 1020.6 1023.1 1031.5 1028.3 1031.5 DAY 19 8 11 13 12 8 9 25 15 9 8 29 MIN. QNH PRESSURE IN HPA 1006.3 1012.1 1003.9 1006.1 1008.9 1005.1 1000.6 1004.0 1008.8 1013.6 1016.2 1008.4 1000.6 DAY 16 22 25 5 5 30 16 6 3 7 19 10 MEAN QFF PRESSURE IN HPA 1019.9 1021.1 1013.9 1011.1 1011.1 1003.3 997.3 1002.3 1010.0 1014.7 1021.1 1021.0 1012.2 MAX. QFF PRESSURE IN HPA 1029.3 1029.8 1028.7 1021.4 1018.2 1007.9 1002.3 1007.8 1017.4 1020.3 1031.0 1032.0 1032.0 DAY 19 8 11 12 7 7 9 29 15 9 8 29 MIN. QFF PRESSURE IN HPA 1007.1 1011.2 1001.9 1003.5 1004.6 997.6 991.6 996.2 1001.7 1008.1 1015.7 1009.3 991.6 DAY 16 22 25 28 5 30 16 6 3 7 19 10 ======================================================================================================================= 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 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 918.1 918.8 913.8 913.9 915.0 910.3 906.3 910.1 915.3 918.0 920.9 919.4 915.0 MAX. QFE PRESSURE IN HPA 925.9 925.5 927.2 920.0 920.8 914.2 910.2 914.2 920.0 923.0 930.2 927.5 930.2 DAY 19 7 11 13 12 8 9 25 15 9 8 28 MIN. QFE PRESSURE IN HPA 908.3 912.8 903.9 908.0 908.2 905.0 902.2 905.0 908.8 913.8 916.4 909.5 902.2 DAY 16 27 25 10 4 30 16 6 3 6 19 10 MEAN QNH PRESSURE IN HPA 1019.4 1020.2 1014.7 1014.9 1016.0 1010.9 1006.6 1010.7 1016.3 1019.3 1022.4 1020.9 1016.0 MAX. QNH PRESSURE IN HPA 1027.9 1027.5 1029.3 1021.5 1022.3 1015.2 1010.8 1015.2 1021.5 1024.7 1032.6 1029.6 1032.6 DAY 19 7 11 13 12 8 9 25 15 9 8 28 MIN. QNH PRESSURE IN HPA 1008.7 1013.6 1003.9 1008.4 1008.6 1005.1 1002.1 1005.1 1009.3 1014.7 1017.5 1010.0 1002.1 DAY 16 27 25 10 4 30 16 6 3 6 19 10 MEAN QFF PRESSURE IN HPA 1021.5 1022.3 1014.7 1011.7 1010.7 1003.3 997.8 1002.7 1010.6 1015.2 1022.1 1022.4 1012.9 MAX. QFF PRESSURE IN HPA 1031.5 1032.3 1030.5 1021.5 1018.5 1007.7 1002.6 1007.9 1017.7 1021.2 1031.8 1032.8 1032.8 DAY 19 7 11 12 7 7 9 28 15 9 8 28 MIN. QFF PRESSURE IN HPA 1009.6 1012.7 1002.0 1004.6 1002.8 997.0 992.5 996.5 1002.0 1009.3 1016.7 1011.0 992.5 DAY 16 22 25 28 4 30 16 14 3 6 5 10 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 916.6 917.3 912.3 912.3 913.5 908.8 905.0 908.4 913.4 916.1 919.2 918.0 913.4 MAX. QFE PRESSURE IN HPA 924.3 924.5 925.5 918.7 920.0 912.5 909.4 912.5 918.4 921.5 928.6 926.1 928.6 DAY 19 7 11 13 12 8 19 28 15 9 8 28 MIN. QFE PRESSURE IN HPA 906.9 910.6 902.8 905.0 906.0 904.0 900.2 903.0 906.9 911.4 915.2 910.0 900.2 DAY 17 27 29 10 4 24 16 14 2 6 5 9 MEAN QNH PRESSURE IN HPA 1017.8 1018.6 1013.1 1013.1 1014.4 1009.3 1005.1 1008.8 1014.3 1017.2 1020.6 1019.3 1014.3 MAX. QNH PRESSURE IN HPA 1026.1 1026.4 1027.5 1020.1 1021.5 1013.3 1009.9 1013.3 1019.7 1023.1 1030.8 1028.1 1030.8 DAY 19 7 11 13 12 8 19 28 15 9 8 28 MIN. QNH PRESSURE IN HPA 1007.2 1011.2 1002.7 1005.1 1006.2 1004.0 999.9 1003.0 1007.2 1012.1 1016.2 1010.6 999.9 DAY 17 27 29 10 4 24 16 14 2 6 5 9 MEAN QFF PRESSURE IN HPA 1018.9 1019.9 1012.7 1009.8 1008.8 1001.6 996.2 1000.5 1008.2 1012.6 1019.7 1020.2 1010.7 MAX. QFF PRESSURE IN HPA 1028.5 1029.9 1028.5 1019.2 1016.2 1006.2 1000.5 1005.5 1015.4 1019.2 1029.6 1031.3 1031.3 DAY 19 7 11 12 12 1 19 28 15 9 8 29 MIN. QFF PRESSURE IN HPA 1007.6 1009.5 1001.1 1001.9 1000.2 995.5 990.2 994.0 999.2 1006.4 1012.8 1011.2 990.2 DAY 17 22 25 10 4 30 16 14 3 6 5 9 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 914.9 915.2 910.5 910.4 911.4 906.5 902.6 906.0 911.2 914.4 917.9 916.6 911.5 MAX. QFE PRESSURE IN HPA 922.2 923.0 923.0 917.1 917.0 910.4 906.6 910.0 916.8 920.0 927.6 925.0 927.6 DAY 19 7 11 13 16 8 19 28 18 8 7 28 MIN. QFE PRESSURE IN HPA 905.4 908.8 900.6 902.5 903.8 901.5 898.8 900.5 904.1 910.4 913.2 908.5 898.8 DAY 16 5 29 10 4 30 16 14 2 6 20 10 MEAN QNH PRESSURE IN HPA 1015.9 1016.2 1011.1 1011.1 1012.1 1006.7 1002.5 1006.2 1011.9 1015.4 1019.2 1017.8 1012.2 MAX. QNH PRESSURE IN HPA 1023.9 1024.7 1024.7 1018.3 1018.2 1011.0 1006.9 1010.6 1018.0 1021.5 1029.7 1026.9 1029.7 DAY 19 7 11 13 16 8 19 28 18 8 7 28 MIN. QNH PRESSURE IN HPA 1005.6 1009.3 1000.3 1002.4 1003.8 1001.3 998.4 1000.2 1004.2 1011.0 1014.1 1008.9 998.4 DAY 16 5 29 10 4 30 16 14 2 6 20 10 MEAN QFF PRESSURE IN HPA 1016.8 1017.4 1010.7 1007.7 1006.9 999.1 993.6 998.1 1005.9 1010.9 1018.3 1018.6 1008.7 MAX. QFF PRESSURE IN HPA 1026.0 1027.8 1025.8 1017.1 1014.2 1003.5 997.9 1003.1 1013.2 1017.1 1028.6 1029.5 1029.5 DAY 19 7 11 13 7 8 8 28 15 8 7 29 MIN. QFF PRESSURE IN HPA 1005.2 1007.5 998.5 998.9 998.2 993.3 989.1 991.3 996.4 1005.9 1012.5 1009.2 989.1 DAY 16 22 7 10 4 30 11 14 2 6 5 10 ======================================================================================================================= 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 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 915.3 915.4 910.7 910.4 911.5 905.9 901.6 905.3 910.9 915.0 918.6 917.5 911.5 MAX. QFE PRESSURE IN HPA 923.0 923.0 922.7 917.0 917.8 912.0 905.4 909.9 915.8 920.0 928.7 925.4 928.7 DAY 19 7 11 13 12 14 19 28 15 9 7 28 MIN. QFE PRESSURE IN HPA 906.1 908.2 901.1 903.3 904.6 900.5 897.4 900.0 904.0 911.0 914.4 909.7 897.4 DAY 16 22 29 10 4 30 16 5 2 2 19 10 MEAN QNH PRESSURE IN HPA 1016.3 1016.4 1011.4 1011.1 1012.2 1006.2 1001.4 1005.5 1011.5 1016.0 1019.9 1018.7 1012.2 MAX. QNH PRESSURE IN HPA 1024.7 1024.7 1024.4 1018.2 1019.1 1012.8 1005.6 1010.5 1016.9 1021.5 1030.9 1027.3 1030.9 DAY 19 7 11 13 12 14 19 28 15 9 7 28 MIN. QNH PRESSURE IN HPA 1006.3 1008.6 1000.9 1003.3 1004.7 1000.2 996.9 999.7 1004.0 1011.7 1015.4 1010.2 996.9 DAY 16 22 29 10 4 30 16 5 2 2 19 10 MEAN QFF PRESSURE IN HPA 1018.3 1018.7 1011.6 1008.4 1007.4 999.0 992.9 998.0 1006.4 1012.6 1019.9 1020.3 1009.5 MAX. QFF PRESSURE IN HPA 1028.3 1028.7 1025.9 1017.0 1014.4 1006.8 996.8 1003.8 1013.0 1018.6 1030.2 1031.0 1031.0 DAY 19 7 11 13 12 14 8 28 15 9 7 28 MIN. QFF PRESSURE IN HPA 1006.6 1008.1 1000.5 1001.6 999.8 992.5 987.9 991.5 997.3 1006.7 1014.7 1011.1 987.9 DAY 16 22 29 9 4 30 11 14 2 2 19 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 916.2 916.5 912.3 911.9 913.2 907.5 903.0 906.7 912.5 916.3 919.3 918.1 912.8 MAX. QFE PRESSURE IN HPA 923.5 924.0 923.5 917.7 918.6 912.0 907.0 911.2 917.2 921.0 928.9 926.0 928.9 DAY 19 7 11 13 11 14 19 28 14 9 7 28 MIN. QFE PRESSURE IN HPA 907.3 910.0 904.4 904.4 905.2 901.5 898.2 902.0 906.2 912.4 915.2 910.0 898.2 DAY 31 22 29 9 4 30 15 5 2 6 18 9 MEAN QNH PRESSURE IN HPA 1017.3 1017.7 1013.1 1012.7 1014.1 1007.9 1003.0 1007.0 1013.3 1017.4 1020.7 1019.4 1013.6 MAX. QNH PRESSURE IN HPA 1025.3 1025.8 1025.3 1019.0 1019.9 1012.8 1007.3 1011.9 1018.4 1022.6 1031.2 1028.0 1031.2 DAY 19 7 11 13 11 14 19 28 14 9 7 28 MIN. QNH PRESSURE IN HPA 1007.6 1010.6 1004.5 1004.5 1005.4 1001.3 997.7 1001.9 1006.4 1013.2 1016.2 1010.6 997.7 DAY 31 22 29 9 4 30 15 5 2 6 18 9 MEAN QFF PRESSURE IN HPA 1019.4 1019.8 1012.9 1009.5 1008.7 1000.4 994.2 999.0 1007.6 1013.3 1020.4 1020.9 1010.5 MAX. QFF PRESSURE IN HPA 1029.4 1029.6 1026.2 1018.4 1015.1 1005.3 998.3 1005.0 1014.2 1018.7 1030.5 1031.6 1031.6 DAY 19 7 11 12 6 14 7 28 14 9 7 28 MIN. QFF PRESSURE IN HPA 1009.6 1010.0 1004.4 1001.5 999.5 993.2 988.1 993.1 999.3 1007.9 1015.6 1011.6 988.1 DAY 16 22 25 9 4 30 15 14 2 2 5 9 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 916.3 916.8 912.3 912.1 913.6 908.0 903.8 907.2 912.9 916.3 919.3 918.1 913.0 MAX. QFE PRESSURE IN HPA 923.3 924.0 923.5 918.0 919.2 912.0 907.3 911.2 917.3 920.5 928.8 926.0 928.8 DAY 23 7 11 12 11 10 19 28 14 8 7 28 MIN. QFE PRESSURE IN HPA 907.5 910.0 905.2 905.1 905.6 902.0 898.2 901.4 906.9 912.8 915.2 910.0 898.2 DAY 16 22 29 9 4 30 15 5 2 2 18 9 MEAN QNH PRESSURE IN HPA 1017.5 1018.0 1013.0 1012.8 1014.5 1008.4 1003.8 1007.5 1013.7 1017.4 1020.7 1019.4 1013.9 MAX. QNH PRESSURE IN HPA 1025.1 1025.8 1025.3 1019.3 1020.6 1012.8 1007.6 1011.9 1018.5 1022.0 1031.0 1028.0 1031.0 DAY 23 7 11 12 11 10 19 28 14 8 7 28 MIN. QNH PRESSURE IN HPA 1007.9 1010.6 1005.4 1005.2 1005.8 1001.9 997.7 1001.2 1007.2 1013.6 1016.2 1010.6 997.7 DAY 16 22 29 9 4 30 15 5 2 2 18 9 MEAN QFF PRESSURE IN HPA 1018.6 1019.3 1012.5 1009.4 1008.8 1000.6 994.8 999.2 1007.6 1012.8 1019.8 1020.3 1010.3 MAX. QFF PRESSURE IN HPA 1027.8 1029.2 1026.2 1019.4 1015.7 1004.7 999.2 1004.6 1014.4 1018.0 1030.0 1031.1 1031.1 DAY 19 7 11 12 6 7 8 28 15 8 7 28 MIN. QFF PRESSURE IN HPA 1008.6 1009.2 1002.7 1001.2 999.9 993.3 987.8 992.5 999.1 1006.8 1015.1 1011.2 987.8 DAY 15 22 24 9 4 30 15 5 2 2 18 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 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 3.1 6.1 11.5 19.0 23.7 30.9 32.8 31.4 26.2 18.1 13.2 7.6 18.6 MINIMUN AIR TEMPERATURE (C) -1.6 0.3 5.0 10.6 15.5 20.9 24.1 22.1 16.0 8.7 4.6 0.2 10.6 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 20 26 23 1 0 0 0 71 DAYS WITH MINIMUM TEMP. <=-4 9 3 0 0 0 0 0 0 0 0 0 1 13 DAYS WITH FREEZING MIN.<= 0 22 13 5 0 0 0 0 0 0 0 1 20 61 TEMPERATURE RECORDS LOWEST(C) -5.4 -7.0 -3.0 3.0 9.0 17.0 19.0 18.0 12.0 4.0 0.0 -4.0 -7.0 DAY 11 18 3 7 6 3 27 31 17 26 26 6 MAXIMUM AIR TEMPERATURE (C) 9.3 12.8 18.5 27.3 31.4 38.8 40.2 39.7 35.3 27.7 23.0 16.0 26.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 12 23 30 31 31 29 10 0 0 166 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 13.0 21.0 26.0 36.0 37.0 43.5 45.0 43.5 40.0 36.0 28.2 21.0 45.0 DAY 27 8 28 16 11 28 11 20 2 1 9 19 DIF. BETWEEN (MAX.-MIN.) (C) 10.9 12.5 13.5 16.7 15.9 17.9 16.1 17.6 19.3 19.0 18.4 15.8 16.1 MEAN DAILY TEMP. (MDT) (C) 3.9 6.5 11.8 19.0 23.4 29.9 32.1 30.9 25.6 18.2 13.8 8.1 18.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 20.8 92.3 266.2 345.6 306.8 139.2 16.8 0.0 0.0 1187.8 HEATING DEG. DAYS(BASE 18 0C) 437.7 320.6 194.6 30.6 2.3 0.0 0.0 0.0 0.0 38.1 125.3 305.5 1454.7 DEWPOINT (MEAN C) -2.7 -3.1 -0.2 3.5 5.6 4.4 7.8 8.5 4.9 2.5 -0.6 -1.2 2.4 MIXING RATIO (G/KG) 3.49 3.42 4.42 5.63 6.44 5.90 7.49 7.90 6.19 5.11 4.10 3.88 5.33 VAPOUR PRESSURE (HPA) 5.11 5.01 6.44 8.18 9.35 8.56 10.78 11.40 8.98 7.47 6.02 5.72 7.75 SATURATION DEF. (HPA) 2.79 4.93 8.14 15.31 21.70 38.02 40.86 36.75 27.08 15.30 10.29 5.30 18.87 RELATIVE HUMIDITY (MEAN %) 68 56 51 42 36 21 23 27 29 40 43 57 41 RELATIVE HUMIDITY (MAX. %) 85 79 73 68 61 37 38 44 46 60 62 77 61 RELATIVE HUMIDITY (MIN. %) 45 34 30 21 19 12 14 15 16 22 24 33 24 RELATIVE HUMIDITY (MEAN% 03UTC) 82 72 69 63 56 36 36 43 46 59 58 76 58 RELATIVE HUMIDITY (MEAN% 09UTC) 52 42 37 25 23 14 17 19 19 25 27 41 28 RELATIVE HUMIDITY (MEAN% 15UTC) 62 46 39 29 23 13 15 17 18 30 35 48 31 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 21.6 19.0 52.4 19.2 4.7 0.0 0.6 8.4 0.4 9.4 0.4 6.0 142.1 DAYS WITH PRECIPITATION >=10 1 0 2 0 0 0 0 0 0 0 0 0 3 DAYS WITH PRECIPITATION >= 5 1 1 5 2 0 0 0 1 0 1 0 1 12 DAYS WITH PRECIPITATION >= 1 6 7 8 5 3 0 0 3 0 2 0 1 35 DAYS WITH PRECIPITATION 8 8 9 6 7 0 2 3 1 2 1 1 48 GREATEST DAILY PRECIPITATION 10.0 7.0 18.0 7.0 2.0 0.0 0.4 5.0 0.4 5.0 0.4 6.0 18.0 DAY 5 12 1 5 4 ** 30 2 14 11 16 3 DAY WITH THUNDER STORM 0 0 0 3 4 0 1 0 1 1 0 0 10 DAYS WITH SNOW OR SLEET 4 3 2 0 0 0 0 0 0 0 0 0 9 DAYS WITH DUST 2 2 1 0 0 2 3 0 0 0 0 0 10 WIND DIRECTION (PREVAILING) 270 270 270 270 315 90 90 90 90 270 270 90 90 PREVAILING WIND SPEED(KNOTS) 8.0 9.9 8.7 8.4 10.5 9.5 10.0 8.5 6.9 5.5 6.2 5.8 8.3 PREVAILING WIND PERCENT 25.0 23.2 30.2 19.6 13.3 36.7 30.2 26.6 17.5 10.1 7.1 4.0 13.0 CALMS PERCENT OF WIND 62.9 51.3 41.9 52.9 48.8 48.8 39.1 59.7 64.6 67.7 78.8 88.3 58.8 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 286 289 286 288 328 88 80 89 74 7 296 64 344 VECTOR WIND MAGNITUDE(KNOTS) 2.6 2.8 3.3 3.1 1.4 4.0 2.9 2.7 0.9 0.5 0.4 0.1 0.5 WIND STEADINESES (MEAN %) 86.7 63.6 67.3 72.1 31.8 87.0 51.8 84.4 39.1 23.8 30.8 16.7 14.7 WIND SPEED (MEAN KNOTS) 3.0 4.4 4.9 4.3 4.4 4.6 5.6 3.2 2.3 2.1 1.3 0.6 3.4 FASTEST WIND DIRECTION 280 300 290 300 280 90 90 330 90 330 60 300 300 FASTEST WIND SPEED (KNOTS) 23 23 23 33 33 23 23 19 16 16 14 12 33 DAY 13 5 15 24 16 13 13 2 14 8 11 5 DAYS WITH SKY CLEAR (0-2)/8 14 12 13 13 17 29 27 23 26 27 20 15 236 DAYS WITH P.CLOUDY (3-6)/8 9 9 7 14 10 1 4 8 4 2 10 13 91 DAYS WITH CLOUDY (7-8)/8 8 7 11 3 4 0 0 0 0 2 0 3 38 DAYS WITH VISIBILITY =< 2 KM 3 1 1 0 1 0 0 0 0 0 0 0 6 DURATION OF SUNSHINE HOURS 176.4 171.2 217.1 266.2 312.3 372.9 360.3 345.6 308.5 286.6 223.5 178.3 3218.9 ======================================================================================================================= 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 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 916.5 916.6 914.1 913.1 913.0 910.5 906.5 909.8 911.7 917.2 918.8 921.0 914.0 MAX. QFE PRESSURE IN HPA 925.8 931.1 921.4 923.8 921.8 917.5 916.4 915.7 918.6 925.8 926.9 928.5 931.1 DAY-HOUR 4- 6 23- 6 27- 6 12- 6 9- 6 17- 3 21- 6 25- 6 12- 6 10- 6 21- 6 29- 6 MIN. QFE PRESSURE IN HPA 904.8 904.6 902.0 904.6 903.8 903.5 897.9 903.5 904.4 907.0 911.5 913.0 897.9 DAY-HOUR 13- 0 8- 0 18-12 21-12 29-12 29-15 4-15 21-15 3-15 1-12 1-15 21-12 MEAN QNH PRESSURE IN HPA 1017.6 1017.7 1015.0 1013.9 1013.8 1011.1 1006.8 1010.3 1012.5 1018.4 1020.1 1022.5 1015.0 MAX. QNH PRESSURE IN HPA 1027.8 1033.5 1023.0 1025.6 1023.4 1018.7 1017.5 1016.8 1019.9 1027.8 1029.0 1030.7 1033.5 DAY-HOUR 4- 6 23- 6 27- 6 12- 6 9- 6 17- 3 21- 6 25- 6 12- 6 10- 6 21- 6 29- 6 MIN. QNH PRESSURE IN HPA 1004.9 1004.7 1001.9 1004.7 1003.8 1003.5 997.4 1003.5 1004.5 1007.3 1012.2 1013.8 997.4 DAY-HOUR 13- 0 8- 0 18-12 21-12 29-12 29-15 4-15 21-15 3-15 1-12 1-15 21-12 MEAN QFF PRESSURE IN HPA 1020.1 1019.0 1014.1 1010.3 1008.6 1003.4 998.4 1002.4 1006.3 1015.1 1018.7 1023.3 1011.6 MAX. QFF PRESSURE IN HPA 1031.5 1036.1 1024.2 1022.3 1020.8 1011.9 1009.9 1008.6 1014.6 1025.6 1027.9 1032.9 1036.1 DAY-HOUR 4- 6 23- 6 4- 6 7- 3 4- 6 17- 3 21- 6 9- 6 12- 6 10- 6 21- 6 29- 6 MIN. QFF PRESSURE IN HPA 1007.0 1002.9 1000.1 1000.0 997.8 995.6 989.5 995.6 998.1 1001.0 1009.4 1013.5 989.5 DAY-HOUR 13- 0 8- 0 18-12 17-12 21-12 29-15 5-15 21-15 3-15 1-12 1-12 31-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 916.4 916.6 914.1 913.4 913.1 910.7 906.6 909.7 911.9 917.0 918.7 921.0 914.1 MAX. QFE PRESSURE IN HPA 923.6 928.8 919.5 921.8 919.5 916.0 914.0 913.5 916.8 923.8 924.7 926.9 928.8 DAY 4 23 22 12 4 17 20 3 13 10 21 10 MIN. QFE PRESSURE IN HPA 904.8 904.6 904.0 906.2 906.6 906.0 900.0 906.0 906.4 909.7 913.0 914.3 900.0 DAY 13 8 30 22 21 29 8 22 5 1 11 21 MEAN QNH PRESSURE IN HPA 1017.5 1017.7 1015.0 1014.2 1013.9 1011.3 1006.8 1010.2 1012.7 1018.2 1020.1 1022.6 1015.0 MAX. QNH PRESSURE IN HPA 1025.4 1031.0 1020.9 1023.4 1020.9 1017.1 1014.9 1014.4 1018.0 1025.6 1026.6 1029.0 1031.0 DAY 4 23 22 12 4 17 20 3 13 10 21 10 MIN. QNH PRESSURE IN HPA 1004.9 1004.7 1004.0 1006.4 1006.9 1006.2 999.7 1006.2 1006.7 1010.2 1013.8 1015.3 999.7 DAY 13 8 30 22 21 29 8 22 5 1 11 21 MEAN QFF PRESSURE IN HPA 1019.5 1018.7 1013.9 1010.5 1008.6 1003.6 998.3 1002.1 1006.3 1014.6 1018.1 1022.8 1011.4 MAX. QFF PRESSURE IN HPA 1027.4 1032.7 1021.2 1020.5 1018.0 1010.0 1007.0 1006.3 1012.9 1023.0 1025.3 1029.1 1032.7 DAY 4 23 4 7 3 17 20 3 13 11 25 10 MIN. QFF PRESSURE IN HPA 1007.0 1002.9 1001.4 1002.9 1000.8 997.4 990.9 997.6 999.0 1004.0 1010.8 1015.6 990.9 DAY 13 8 30 22 21 29 8 22 5 1 11 21 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 916.7 916.7 914.8 914.1 914.2 912.2 908.0 911.2 913.1 917.9 919.3 921.3 914.9 MAX. QFE PRESSURE IN HPA 924.6 929.6 920.2 922.8 920.6 917.5 915.7 915.1 917.8 925.4 925.8 927.3 929.6 DAY 4 23 27 12 4 17 20 25 13 10 21 10 MIN. QFE PRESSURE IN HPA 905.4 904.8 905.4 907.4 907.0 907.0 901.0 907.2 908.0 910.2 914.3 913.9 901.0 DAY 13 8 15 22 30 29 8 17 3 1 11 21 MEAN QNH PRESSURE IN HPA 1017.8 1017.9 1015.8 1015.0 1015.2 1013.0 1008.4 1011.9 1013.9 1019.2 1020.7 1022.8 1016.0 MAX. QNH PRESSURE IN HPA 1026.5 1031.9 1021.7 1024.5 1022.1 1018.7 1016.8 1016.1 1019.1 1027.3 1027.8 1029.4 1031.9 DAY 4 23 27 12 4 17 20 25 13 10 21 10 MIN. QNH PRESSURE IN HPA 1005.6 1004.9 1005.6 1007.7 1007.3 1007.3 1000.8 1007.5 1008.4 1010.8 1015.3 1014.8 1000.8 DAY 13 8 15 22 30 29 8 17 3 1 11 21 MEAN QFF PRESSURE IN HPA 1020.6 1019.6 1015.4 1011.9 1010.2 1005.6 1000.3 1004.3 1008.4 1016.6 1019.9 1024.1 1013.1 MAX. QFF PRESSURE IN HPA 1029.7 1034.9 1023.2 1022.3 1019.5 1011.9 1009.7 1008.4 1014.4 1024.5 1027.3 1031.3 1034.9 DAY 4 23 4 7 4 17 21 8 13 10 21 10 MIN. QFF PRESSURE IN HPA 1008.4 1003.3 1003.5 1004.2 1002.2 999.3 992.2 999.2 1001.5 1005.2 1013.3 1015.9 992.2 DAY 13 8 15 22 21 29 8 17 5 1 11 21 ======================================================================================================================= 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 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 917.9 918.0 915.8 914.8 914.9 912.7 908.7 912.1 914.1 919.2 920.6 922.6 916.0 MAX. QFE PRESSURE IN HPA 925.8 931.1 921.4 923.8 921.8 917.3 916.4 915.7 918.6 925.8 926.9 928.5 931.1 DAY 4 23 27 12 9 17 21 25 12 10 21 29 MIN. QFE PRESSURE IN HPA 905.9 907.4 906.8 908.1 907.0 908.4 901.7 909.0 908.8 912.2 916.0 915.6 901.7 DAY 13 8 15 24 30 29 5 21 3 1 1 21 MEAN QNH PRESSURE IN HPA 1019.2 1019.3 1016.9 1015.9 1015.9 1013.5 1009.2 1012.9 1015.0 1020.6 1022.1 1024.3 1017.1 MAX. QNH PRESSURE IN HPA 1027.8 1033.5 1023.0 1025.6 1023.4 1018.5 1017.5 1016.8 1019.9 1027.8 1029.0 1030.7 1033.5 DAY 4 23 27 12 9 17 21 25 12 10 21 29 MIN. QNH PRESSURE IN HPA 1006.1 1007.7 1007.1 1008.5 1007.3 1008.8 1001.5 1009.5 1009.3 1013.0 1017.1 1016.7 1001.5 DAY 13 8 15 24 30 29 5 21 3 1 1 21 MEAN QFF PRESSURE IN HPA 1022.0 1020.8 1016.3 1012.3 1010.7 1005.8 1000.8 1004.9 1008.9 1017.5 1021.1 1025.7 1013.9 MAX. QFF PRESSURE IN HPA 1031.5 1036.1 1024.2 1022.0 1020.8 1011.4 1009.9 1008.6 1014.6 1025.6 1027.9 1032.9 1036.1 DAY 4 23 4 7 4 17 21 9 12 10 21 29 MIN. QFF PRESSURE IN HPA 1009.2 1006.4 1004.8 1004.4 1001.6 1000.2 993.0 1000.6 1002.1 1006.8 1014.7 1018.4 993.0 DAY 13 8 15 22 30 29 5 21 3 1 1 21 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 916.8 916.8 914.5 913.4 913.5 911.1 907.2 910.6 912.4 917.6 919.0 921.1 914.5 MAX. QFE PRESSURE IN HPA 924.6 929.5 920.6 923.2 920.9 916.2 914.4 914.2 917.4 925.0 925.2 926.5 929.5 DAY 4 23 27 12 4 6 20 9 12 10 21 9 MIN. QFE PRESSURE IN HPA 905.9 906.0 905.8 906.4 906.0 906.4 900.0 907.2 907.0 909.0 913.7 914.2 900.0 DAY 13 8 15 22 21 29 5 23 3 1 1 21 MEAN QNH PRESSURE IN HPA 1017.9 1017.9 1015.5 1014.2 1014.4 1011.8 1007.6 1011.2 1013.1 1018.8 1020.3 1022.6 1015.5 MAX. QNH PRESSURE IN HPA 1026.5 1031.8 1022.1 1024.9 1022.4 1017.3 1015.4 1015.2 1018.6 1026.9 1027.1 1028.5 1031.8 DAY 4 23 27 12 4 6 20 9 12 10 21 9 MIN. QNH PRESSURE IN HPA 1006.1 1006.2 1006.0 1006.7 1006.2 1006.7 999.7 1007.5 1007.3 1009.5 1014.6 1015.2 999.7 DAY 13 8 15 22 21 29 5 23 3 1 1 21 MEAN QFF PRESSURE IN HPA 1020.1 1018.9 1014.4 1010.4 1009.0 1004.0 999.0 1003.1 1006.7 1015.2 1018.4 1022.9 1011.8 MAX. QFF PRESSURE IN HPA 1029.3 1033.6 1021.8 1020.3 1019.8 1009.4 1007.5 1007.5 1013.4 1025.2 1025.6 1029.8 1033.6 DAY 4 23 4 12 4 17 20 9 12 10 21 29 MIN. QFF PRESSURE IN HPA 1008.9 1004.5 1003.0 1002.2 999.7 997.9 991.2 999.2 999.9 1003.3 1011.1 1015.5 991.2 DAY 13 8 15 22 21 29 5 20 5 1 1 21 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 915.4 915.2 912.4 911.5 911.5 909.0 905.0 908.4 910.2 915.7 917.4 919.6 912.6 MAX. QFE PRESSURE IN HPA 922.4 927.1 918.6 922.0 917.5 913.6 912.4 912.0 915.6 923.6 923.9 926.5 927.1 DAY 4 23 27 12 4 6 20 25 12 10 21 29 MIN. QFE PRESSURE IN HPA 905.9 905.2 902.0 904.6 903.8 904.2 899.0 904.8 905.4 907.0 912.0 913.0 899.0 DAY 13 8 18 21 29 29 5 22 3 1 1 21 MEAN QNH PRESSURE IN HPA 1016.5 1016.2 1013.2 1012.2 1012.2 1009.5 1005.2 1008.8 1010.8 1016.8 1018.6 1021.0 1013.4 MAX. QNH PRESSURE IN HPA 1024.1 1029.2 1019.9 1023.6 1018.7 1014.5 1013.2 1012.8 1016.7 1025.4 1025.7 1028.5 1029.2 DAY 4 23 27 12 4 6 20 25 12 10 21 29 MIN. QNH PRESSURE IN HPA 1006.1 1005.4 1001.9 1004.7 1003.8 1004.3 998.6 1004.9 1005.6 1007.3 1012.8 1013.8 998.6 DAY 13 8 18 21 29 29 5 22 3 1 1 21 MEAN QFF PRESSURE IN HPA 1018.4 1017.1 1012.0 1008.4 1006.9 1001.9 996.7 1000.7 1004.4 1013.2 1016.7 1021.2 1009.8 MAX. QFF PRESSURE IN HPA 1026.3 1030.5 1019.6 1019.3 1015.6 1006.9 1005.6 1004.7 1011.3 1023.4 1023.7 1029.6 1030.5 DAY 4 23 4 12 4 17 20 8 12 10 21 29 MIN. QFF PRESSURE IN HPA 1009.0 1003.3 1000.1 1000.0 997.8 995.8 990.0 996.3 998.3 1001.0 1009.4 1013.5 990.0 DAY 13 8 18 17 21 29 5 17 3 1 1 31 ======================================================================================================================= 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 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 916.1 915.8 912.7 911.5 911.1 908.3 904.5 907.8 909.7 915.8 917.8 920.4 912.6 MAX. QFE PRESSURE IN HPA 922.0 926.6 918.6 920.2 917.9 913.8 911.4 912.0 915.4 923.0 924.3 926.3 926.6 DAY 22 23 27 12 3 16 21 9 12 10 21 29 MIN. QFE PRESSURE IN HPA 907.4 906.9 902.4 904.6 903.8 903.5 897.9 903.5 904.4 908.0 911.5 914.4 897.9 DAY 12 13 18 23 29 29 4 21 3 1 1 31 MEAN QNH PRESSURE IN HPA 1017.2 1016.9 1013.5 1012.2 1011.8 1008.7 1004.6 1008.2 1010.3 1016.9 1019.1 1021.9 1013.4 MAX. QNH PRESSURE IN HPA 1023.6 1028.6 1019.9 1021.7 1019.2 1014.7 1012.1 1012.8 1016.5 1024.7 1026.1 1028.3 1028.6 DAY 22 23 27 12 3 16 21 9 12 10 21 29 MIN. QNH PRESSURE IN HPA 1007.7 1007.2 1002.3 1004.7 1003.8 1003.5 997.4 1003.5 1004.5 1008.4 1012.2 1015.4 997.4 DAY 12 13 18 23 29 29 4 21 3 1 1 31 MEAN QFF PRESSURE IN HPA 1019.9 1018.6 1013.0 1009.0 1006.8 1001.4 996.5 1000.6 1004.7 1014.3 1018.2 1023.1 1010.5 MAX. QFF PRESSURE IN HPA 1026.7 1031.3 1021.1 1018.0 1016.6 1008.1 1005.3 1005.5 1011.4 1023.6 1025.6 1029.9 1031.3 DAY 22 23 4 12 2 16 21 9 12 10 21 9 MIN. QFF PRESSURE IN HPA 1011.6 1006.4 1000.5 1001.2 998.0 995.6 989.5 995.6 998.1 1003.5 1010.2 1015.4 989.5 DAY 12 8 18 21 29 29 5 21 3 1 1 31 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 916.5 916.8 914.1 912.9 912.6 909.6 905.9 909.0 911.1 917.0 918.7 921.0 913.8 MAX. QFE PRESSURE IN HPA 923.0 928.1 919.8 921.4 919.2 915.4 912.4 912.0 916.4 923.6 924.5 926.7 928.1 DAY 22 22 28 11 3 16 20 2 12 10 21 9 MIN. QFE PRESSURE IN HPA 906.0 907.2 905.0 906.0 905.0 905.0 899.6 904.4 905.8 909.2 913.0 914.9 899.6 DAY 12 7 18 21 21 28 4 21 4 1 1 31 MEAN QNH PRESSURE IN HPA 1017.7 1018.0 1015.1 1013.8 1013.4 1010.1 1006.1 1009.5 1011.8 1018.2 1020.1 1022.5 1014.7 MAX. QNH PRESSURE IN HPA 1024.7 1030.3 1021.2 1023.0 1020.6 1016.5 1013.2 1012.8 1017.5 1025.4 1026.4 1028.8 1030.3 DAY 22 22 28 11 3 16 20 2 12 10 21 9 MIN. QNH PRESSURE IN HPA 1006.2 1007.5 1005.1 1006.2 1005.1 1005.1 999.3 1004.5 1006.0 1009.7 1013.8 1015.9 999.3 DAY 12 7 18 21 21 28 4 21 4 1 1 31 MEAN QFF PRESSURE IN HPA 1020.4 1019.5 1014.5 1010.2 1008.1 1002.4 997.7 1001.5 1005.7 1015.0 1019.1 1023.9 1011.5 MAX. QFF PRESSURE IN HPA 1028.0 1032.3 1022.2 1020.2 1018.3 1008.8 1005.4 1005.7 1012.2 1024.6 1026.0 1030.0 1032.3 DAY 22 22 4 6 3 16 20 2 12 10 24 9 MIN. QFF PRESSURE IN HPA 1009.4 1006.4 1004.2 1002.0 998.8 996.5 991.0 996.0 999.3 1004.7 1011.4 1015.6 991.0 DAY 12 7 18 21 21 28 5 21 4 1 10 31 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 916.4 916.8 914.2 913.1 913.1 910.1 906.4 909.5 911.5 917.2 918.8 921.0 914.0 MAX. QFE PRESSURE IN HPA 923.0 928.7 919.5 921.8 920.0 916.0 913.0 913.5 916.8 923.8 924.4 926.5 928.7 DAY 22 22 21 11 3 16 19 2 12 9 24 9 MIN. QFE PRESSURE IN HPA 905.0 906.0 905.6 906.2 906.0 905.4 900.0 905.0 906.4 910.0 913.0 914.2 900.0 DAY 12 7 14 21 21 28 7 21 4 1 10 31 MEAN QNH PRESSURE IN HPA 1017.6 1018.0 1015.2 1014.0 1013.9 1010.7 1006.6 1010.0 1012.2 1018.4 1020.2 1022.6 1014.9 MAX. QNH PRESSURE IN HPA 1024.7 1030.9 1020.9 1023.4 1021.5 1017.1 1013.8 1014.4 1018.0 1025.6 1026.3 1028.5 1030.9 DAY 22 22 21 11 3 16 19 2 12 9 24 9 MIN. QNH PRESSURE IN HPA 1005.1 1006.2 1005.8 1006.4 1006.2 1005.6 999.7 1005.1 1006.7 1010.6 1013.8 1015.2 999.7 DAY 12 7 14 21 21 28 7 21 4 1 10 31 MEAN QFF PRESSURE IN HPA 1019.7 1018.9 1013.9 1010.0 1008.4 1002.8 998.1 1001.9 1005.7 1014.7 1018.3 1022.8 1011.3 MAX. QFF PRESSURE IN HPA 1027.3 1032.3 1021.3 1020.3 1018.7 1009.5 1006.1 1006.7 1012.7 1024.7 1025.6 1028.4 1032.3 DAY 22 22 4 6 3 16 20 2 12 10 24 9 MIN. QFF PRESSURE IN HPA 1007.6 1004.0 1002.9 1001.6 999.4 996.4 991.0 996.5 999.3 1004.6 1010.8 1014.1 991.0 DAY 12 7 14 17 21 28 7 21 2 1 10 31 ======================================================================================================================= 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 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.8 9.0 11.6 18.4 25.5 31.1 30.8 31.9 25.7 20.2 9.8 6.1 18.7 MINIMUN AIR TEMPERATURE (C) -0.4 1.5 4.1 9.4 15.2 20.5 21.6 21.4 15.6 11.2 4.2 0.4 10.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 15 19 20 1 0 0 0 56 DAYS WITH MINIMUM TEMP. <=-4 4 0 0 0 0 0 0 0 0 0 0 3 7 DAYS WITH FREEZING MIN.<= 0 17 12 2 0 0 0 0 0 0 0 1 18 50 TEMPERATURE RECORDS LOWEST(C) -10.0 -2.0 0.0 2.0 8.0 18.0 17.0 17.5 8.0 7.0 -3.5 -5.0 -10.0 DAY 4 1 7 11 22 7 16 28 29 22 30 1 MAXIMUM AIR TEMPERATURE (C) 11.1 17.2 18.6 26.7 34.3 39.5 38.7 40.5 35.1 29.4 16.8 13.2 26.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 5 30 30 31 31 26 19 0 0 172 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 17.0 22.5 26.0 32.0 41.5 42.0 44.0 42.2 39.2 35.0 23.5 20.5 44.0 DAY 31 28 26 30 31 1 4 1 3 6 19 29 DIF. BETWEEN (MAX.-MIN.) (C) 11.5 15.7 14.5 17.3 19.1 19.0 17.1 19.1 19.5 18.2 12.6 12.8 16.4 MEAN DAILY TEMP. (MDT) (C) 5.4 9.3 11.4 18.0 24.7 30.0 30.1 31.0 25.4 20.3 10.5 6.8 18.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 3.3 120.8 270.4 283.0 308.8 135.2 26.7 0.0 0.0 1148.2 HEATING DEG. DAYS(BASE 18 0C) 391.8 243.2 205.4 30.3 0.0 0.0 0.0 0.0 0.0 16.5 225.1 347.7 1460.1 DEWPOINT (MEAN C) -1.8 -1.7 -0.3 2.3 1.3 2.0 8.2 5.8 5.4 3.4 2.4 0.9 2.3 MIXING RATIO (G/KG) 3.80 3.82 4.27 5.26 4.75 4.99 7.77 6.54 6.36 5.46 5.20 4.59 5.23 VAPOUR PRESSURE (HPA) 5.57 5.58 6.22 7.66 6.90 7.22 11.18 9.46 9.21 7.96 7.61 6.75 7.61 SATURATION DEF. (HPA) 3.42 6.59 8.19 14.66 27.87 40.02 35.39 40.00 26.31 17.57 5.13 3.13 19.02 RELATIVE HUMIDITY (MEAN %) 66 53 50 38 24 18 27 22 30 36 64 72 42 RELATIVE HUMIDITY (MAX. %) 84 78 75 62 42 30 43 36 47 52 84 89 60 RELATIVE HUMIDITY (MIN. %) 43 27 28 20 12 9 16 12 18 24 42 48 25 RELATIVE HUMIDITY (MEAN% 03UTC) 80 74 71 58 40 29 42 35 45 50 78 86 57 RELATIVE HUMIDITY (MEAN% 09UTC) 50 34 35 24 15 12 20 15 21 28 46 56 30 RELATIVE HUMIDITY (MEAN% 15UTC) 59 40 35 26 14 10 17 13 22 31 60 65 33 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 41.6 14.7 19.7 8.2 0.0 0.0 2.5 0.0 0.0 1.9 60.5 14.5 163.6 DAYS WITH PRECIPITATION >=10 1 0 1 0 0 0 0 0 0 0 2 1 5 DAYS WITH PRECIPITATION >= 5 2 1 2 1 0 0 0 0 0 0 3 1 10 DAYS WITH PRECIPITATION >= 1 6 3 4 2 0 0 1 0 0 1 4 2 23 DAYS WITH PRECIPITATION 6 5 6 5 0 0 3 0 0 4 4 5 38 GREATEST DAILY PRECIPITATION 24.0 8.0 10.0 5.2 0.0 0.0 2.0 0.0 0.0 1.0 35.0 12.0 35.0 DAY 21 6 2 27 ** ** 14 ** ** 31 8 10 DAY WITH THUNDER STORM 0 0 0 2 0 0 0 0 0 1 0 0 3 DAYS WITH SNOW OR SLEET 1 1 0 0 0 0 0 0 0 0 1 1 4 DAYS WITH DUST 1 0 0 0 0 1 0 0 1 0 1 1 5 WIND DIRECTION (PREVAILING) 315 315 270 315 315 90 90 90 90 270 270 270 90 PREVAILING WIND SPEED(KNOTS) 8.7 10.6 8.4 9.6 12.2 9.1 10.1 9.0 10.0 8.1 7.8 7.4 9.0 PREVAILING WIND PERCENT 10.1 12.9 11.3 15.4 16.5 19.6 27.8 29.0 10.0 9.3 12.1 12.1 10.3 CALMS PERCENT OF WIND 75.8 67.9 66.5 49.6 51.2 43.3 52.0 58.5 69.2 68.1 70.8 77.0 62.5 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 302 295 293 301 305 12 84 90 75 304 291 286 331 VECTOR WIND MAGNITUDE(KNOTS) 1.2 1.8 1.5 1.9 2.5 0.6 3.3 2.9 0.6 1.1 1.3 0.9 0.7 WIND STEADINESES (MEAN %) 70.6 64.3 51.7 42.2 48.1 11.3 71.7 78.4 22.2 44.0 59.1 56.3 21.2 WIND SPEED (MEAN KNOTS) 1.7 2.8 2.9 4.5 5.2 5.3 4.6 3.7 2.7 2.5 2.2 1.6 3.3 FASTEST WIND DIRECTION 330 300 300 270 250 100 90 90 120 270 300 270 270 FASTEST WIND SPEED (KNOTS) 19 25 23 29 29 23 21 19 19 16 23 19 29 DAY 1 21 17 14 20 11 19 20 6 11 20 16 DAYS WITH SKY CLEAR (0-2)/8 17 19 13 15 26 27 29 27 29 23 11 16 252 DAYS WITH P.CLOUDY (3-6)/8 7 6 14 15 5 3 2 4 1 8 16 11 92 DAYS WITH CLOUDY (7-8)/8 7 3 4 0 0 0 0 0 0 0 3 4 21 DAYS WITH VISIBILITY =< 2 KM 2 1 0 0 0 0 0 0 0 0 4 3 10 DURATION OF SUNSHINE HOURS 187.8 234.0 215.5 268.8 349.4 361.4 367.6 352.6 316.1 274.1 194.6 184.5 3306.4 ======================================================================================================================= 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 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 918.8 915.1 913.7 913.4 911.4 907.4 906.5 909.0 910.9 915.8 918.5 922.4 913.6 MAX. QFE PRESSURE IN HPA 931.8 924.0 922.7 920.0 919.3 914.8 913.4 917.7 919.7 922.7 928.0 930.2 931.8 DAY-HOUR 2- 6 12- 6 19- 6 11- 6 28- 6 8- 6 19- 6 20- 6 29- 6 27- 6 30- 6 6- 6 MIN. QFE PRESSURE IN HPA 910.5 903.3 906.1 902.2 900.5 898.0 900.2 902.9 904.0 911.0 910.1 913.6 898.0 DAY-HOUR 9-12 20-15 26-12 8-12 20-12 25-12 22-15 13-15 15-15 31-12 1- 9 15-12 MEAN QNH PRESSURE IN HPA 1020.1 1016.1 1014.6 1014.3 1012.1 1007.8 1006.7 1009.4 1011.6 1016.9 1019.8 1024.1 1014.5 MAX. QNH PRESSURE IN HPA 1034.3 1025.8 1024.4 1021.5 1020.7 1015.8 1014.3 1019.0 1021.1 1024.4 1030.2 1032.6 1034.3 DAY-HOUR 2- 6 12- 6 19- 6 11- 6 28- 6 8- 6 19- 6 20- 6 29- 6 27- 6 30- 6 6- 6 MIN. QNH PRESSURE IN HPA 1011.1 1003.3 1006.3 1002.1 1000.2 997.5 999.9 1002.8 1004.0 1011.7 1010.7 1014.5 997.5 DAY-HOUR 9-12 20-15 26-12 8-12 20-12 25-12 22-15 13-15 15-15 31-12 1- 9 15-12 MEAN QFF PRESSURE IN HPA 1021.9 1016.2 1013.7 1010.9 1006.3 1000.1 998.9 1001.4 1005.5 1012.9 1019.5 1025.4 1011.1 MAX. QFF PRESSURE IN HPA 1036.8 1026.9 1026.2 1020.4 1014.8 1008.9 1006.6 1011.1 1017.2 1023.6 1033.6 1035.8 1036.8 DAY-HOUR 2- 6 12- 6 19- 6 11- 6 2- 6 17- 3 28- 3 20- 6 29- 6 27- 6 30- 6 6- 6 MIN. QFF PRESSURE IN HPA 1011.8 1001.9 1003.4 997.7 993.2 989.7 991.5 994.9 996.9 1006.7 1007.5 1014.4 989.7 DAY-HOUR 9-12 20-15 26-12 8-12 20-12 25-12 4-15 14-12 16-12 19-12 1- 9 16- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 918.9 915.2 913.7 913.8 911.9 907.9 906.9 909.1 911.0 915.9 918.3 922.5 913.7 MAX. QFE PRESSURE IN HPA 928.0 922.0 921.5 918.0 917.0 913.6 911.6 915.7 917.0 921.9 924.2 928.7 928.7 DAY 2 12 19 11 28 17 28 20 29 27 30 6 MIN. QFE PRESSURE IN HPA 912.2 904.8 907.8 907.3 905.5 899.3 902.1 904.8 905.0 913.6 911.0 913.8 899.3 DAY 10 21 22 14 20 25 23 14 16 19 26 16 MEAN QNH PRESSURE IN HPA 1020.2 1016.3 1014.6 1014.7 1012.6 1008.3 1007.2 1009.6 1011.6 1017.0 1019.6 1024.2 1014.7 MAX. QNH PRESSURE IN HPA 1030.2 1023.6 1023.1 1019.3 1018.2 1014.5 1012.3 1016.8 1018.2 1023.5 1026.0 1030.9 1030.9 DAY 2 12 19 11 28 17 28 20 29 27 30 6 MIN. QNH PRESSURE IN HPA 1013.0 1004.9 1008.2 1007.6 1005.7 998.9 1002.0 1004.9 1005.1 1014.5 1011.7 1014.7 998.9 DAY 10 21 22 14 20 25 23 14 16 19 26 16 MEAN QFF PRESSURE IN HPA 1021.6 1016.0 1013.5 1011.2 1006.7 1000.5 999.3 1001.4 1005.4 1012.7 1018.9 1025.2 1011.0 MAX. QFF PRESSURE IN HPA 1032.3 1024.0 1024.3 1018.0 1011.4 1007.7 1005.7 1008.6 1014.6 1022.2 1027.8 1032.8 1032.8 DAY 3 12 19 11 23 17 28 20 28 27 30 1 MIN. QFF PRESSURE IN HPA 1013.6 1004.3 1006.6 1003.4 998.7 991.3 993.6 996.0 997.7 1009.1 1009.5 1014.4 991.3 DAY 1 21 22 14 20 25 23 14 16 13 1 16 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.8 915.7 914.3 914.6 913.0 909.3 908.2 910.4 912.1 916.7 918.7 922.7 914.5 MAX. QFE PRESSURE IN HPA 929.8 922.5 921.8 919.0 918.0 914.7 912.7 916.5 918.0 921.8 926.4 928.9 929.8 DAY 2 12 19 11 28 17 19 20 29 27 30 6 MIN. QFE PRESSURE IN HPA 912.2 907.8 908.7 908.2 905.8 900.2 904.1 907.2 906.2 913.6 910.4 915.2 900.2 DAY 9 20 22 14 20 25 23 14 16 31 26 16 MEAN QNH PRESSURE IN HPA 1020.1 1016.8 1015.3 1015.6 1013.8 1009.8 1008.6 1011.0 1012.9 1017.9 1020.1 1024.4 1015.5 MAX. QNH PRESSURE IN HPA 1032.1 1024.2 1023.4 1020.4 1019.3 1015.7 1013.5 1017.7 1019.3 1023.4 1028.4 1031.2 1032.1 DAY 2 12 19 11 28 17 19 20 29 27 30 6 MIN. QNH PRESSURE IN HPA 1013.0 1008.2 1009.2 1008.6 1006.0 999.9 1004.2 1007.5 1006.4 1014.5 1011.0 1016.2 999.9 DAY 9 20 22 14 20 25 23 14 16 31 26 16 MEAN QFF PRESSURE IN HPA 1022.3 1017.4 1014.8 1012.8 1008.4 1002.3 1001.0 1003.4 1007.4 1014.5 1020.2 1026.1 1012.6 MAX. QFF PRESSURE IN HPA 1035.1 1025.4 1025.4 1019.8 1013.6 1008.9 1006.6 1010.2 1016.4 1022.7 1032.0 1034.6 1035.1 DAY 2 12 19 11 22 17 28 20 29 27 30 6 MIN. QFF PRESSURE IN HPA 1013.7 1006.3 1007.7 1005.3 999.2 992.4 996.3 1000.0 999.6 1009.8 1009.3 1016.7 992.4 DAY 9 20 22 14 20 25 4 14 16 13 1 16 ======================================================================================================================= 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 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 919.9 916.9 915.4 915.4 913.6 909.7 908.6 911.2 913.1 917.9 919.9 923.9 915.5 MAX. QFE PRESSURE IN HPA 931.8 924.0 922.7 920.0 919.3 914.8 913.4 917.7 919.7 922.7 928.0 930.2 931.8 DAY 2 12 19 11 28 8 19 20 29 27 30 6 MIN. QFE PRESSURE IN HPA 912.2 908.4 910.5 908.2 905.1 900.4 905.0 907.0 907.4 915.0 910.6 917.0 900.4 DAY 9 20 21 14 20 25 23 14 16 31 26 15 MEAN QNH PRESSURE IN HPA 1021.4 1018.1 1016.5 1016.5 1014.5 1010.3 1009.0 1011.9 1014.0 1019.2 1021.3 1025.7 1016.5 MAX. QNH PRESSURE IN HPA 1034.3 1025.8 1024.4 1021.5 1020.7 1015.8 1014.3 1019.0 1021.1 1024.4 1030.2 1032.6 1034.3 DAY 2 12 19 11 28 8 19 20 29 27 30 6 MIN. QNH PRESSURE IN HPA 1013.0 1008.8 1011.1 1008.6 1005.2 1000.1 1005.1 1007.3 1007.7 1016.0 1011.2 1018.2 1000.1 DAY 9 20 21 14 20 25 23 14 16 31 26 15 MEAN QFF PRESSURE IN HPA 1023.5 1018.6 1015.7 1013.1 1008.7 1002.6 1001.2 1003.8 1007.9 1015.2 1021.3 1027.5 1013.3 MAX. QFF PRESSURE IN HPA 1036.8 1026.9 1026.2 1020.4 1014.8 1008.8 1006.6 1011.1 1017.2 1023.6 1033.6 1035.8 1036.8 DAY 2 12 19 11 2 8 28 20 29 27 30 6 MIN. QFF PRESSURE IN HPA 1013.9 1007.0 1009.6 1003.9 998.3 991.7 996.5 999.1 1000.8 1011.3 1010.3 1018.9 991.7 DAY 9 20 22 14 20 25 23 14 16 13 1 14 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 919.1 915.7 914.3 913.8 912.0 908.0 907.1 909.7 911.5 916.2 918.5 922.6 914.0 MAX. QFE PRESSURE IN HPA 930.8 923.0 921.9 919.0 917.5 913.3 911.3 915.7 918.1 922.1 927.0 928.9 930.8 DAY 2 12 19 11 28 8 19 20 30 26 30 6 MIN. QFE PRESSURE IN HPA 910.7 906.7 908.9 905.5 902.7 898.9 903.7 905.5 906.1 913.0 910.1 914.4 898.9 DAY 9 20 21 8 20 25 22 14 16 31 1 15 MEAN QNH PRESSURE IN HPA 1020.5 1016.8 1015.3 1014.7 1012.7 1008.4 1007.4 1010.2 1012.3 1017.3 1019.9 1024.3 1015.0 MAX. QNH PRESSURE IN HPA 1033.2 1024.7 1023.5 1020.4 1018.7 1014.2 1012.0 1016.8 1019.4 1023.8 1029.1 1031.2 1033.2 DAY 2 12 19 11 28 8 19 20 30 26 30 6 MIN. QNH PRESSURE IN HPA 1011.3 1007.0 1009.4 1005.7 1002.6 998.5 1003.7 1005.7 1006.3 1013.8 1010.7 1015.4 998.5 DAY 9 20 21 8 20 25 22 14 16 31 1 15 MEAN QFF PRESSURE IN HPA 1021.9 1016.6 1014.1 1011.1 1006.8 1000.6 999.5 1002.0 1006.0 1013.0 1019.3 1025.3 1011.3 MAX. QFF PRESSURE IN HPA 1035.5 1025.4 1025.0 1018.6 1012.1 1007.3 1005.0 1008.9 1015.5 1022.3 1031.7 1033.4 1035.5 DAY 2 12 19 11 23 8 28 20 29 26 30 6 MIN. QFF PRESSURE IN HPA 1012.2 1004.8 1008.0 1001.4 995.5 990.8 995.0 996.8 999.2 1008.8 1007.5 1015.8 990.8 DAY 9 20 26 14 20 25 4 14 16 19 1 15 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 917.7 913.7 912.3 911.7 909.6 905.8 904.9 907.5 909.4 914.5 917.2 921.2 912.1 MAX. QFE PRESSURE IN HPA 929.0 920.9 918.9 917.0 915.1 910.7 908.9 913.0 916.2 920.3 925.6 927.3 929.0 DAY 2 12 19 11 28 8 28 20 30 26 30 6 MIN. QFE PRESSURE IN HPA 910.5 905.1 906.1 902.2 900.5 898.0 901.4 903.5 904.2 911.0 910.6 913.6 898.0 DAY 9 20 26 8 20 25 22 14 16 31 1 15 MEAN QNH PRESSURE IN HPA 1018.9 1014.6 1013.1 1012.4 1010.2 1006.0 1005.0 1007.9 1010.0 1015.4 1018.4 1022.8 1012.9 MAX. QNH PRESSURE IN HPA 1031.3 1022.4 1020.3 1018.2 1016.1 1011.3 1009.4 1013.8 1017.3 1021.8 1027.6 1029.4 1031.3 DAY 2 12 19 11 28 8 28 20 30 26 30 6 MIN. QNH PRESSURE IN HPA 1011.1 1005.2 1006.3 1002.1 1000.2 997.5 1001.2 1003.5 1004.3 1011.7 1011.2 1014.5 997.5 DAY 9 20 26 8 20 25 22 14 16 31 1 15 MEAN QFF PRESSURE IN HPA 1020.2 1014.4 1012.0 1008.8 1004.3 998.2 997.1 999.7 1003.7 1011.0 1017.8 1023.6 1009.2 MAX. QFF PRESSURE IN HPA 1033.9 1022.7 1021.7 1016.5 1009.9 1004.4 1002.5 1006.0 1012.8 1019.9 1030.2 1031.5 1033.9 DAY 2 12 19 11 23 8 28 20 30 26 30 6 MIN. QFF PRESSURE IN HPA 1011.8 1003.4 1003.4 997.7 993.2 989.7 992.3 994.9 996.9 1006.7 1009.2 1014.7 989.7 DAY 9 20 26 8 20 25 4 14 16 19 1 15 ======================================================================================================================= 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 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 918.1 913.8 912.3 911.5 909.2 905.0 904.0 906.9 909.0 914.5 917.8 921.9 912.0 MAX. QFE PRESSURE IN HPA 929.4 921.0 919.8 916.0 914.2 909.8 908.3 912.8 916.1 920.8 926.4 927.7 929.4 DAY 2 12 18 11 28 8 28 20 30 26 30 5 MIN. QFE PRESSURE IN HPA 911.7 903.3 906.3 902.2 900.7 898.2 900.2 902.9 904.0 911.5 910.9 913.8 898.2 DAY 9 20 21 8 20 24 22 13 15 19 25 15 MEAN QNH PRESSURE IN HPA 1019.4 1014.8 1013.1 1012.2 1009.7 1005.1 1004.1 1007.2 1009.5 1015.4 1019.1 1023.5 1012.8 MAX. QNH PRESSURE IN HPA 1031.7 1022.6 1021.2 1017.1 1015.2 1010.4 1008.7 1013.6 1017.2 1022.3 1028.4 1029.8 1031.7 DAY 2 12 18 11 28 8 28 20 30 26 30 5 MIN. QNH PRESSURE IN HPA 1012.4 1003.3 1006.6 1002.1 1000.5 997.7 999.9 1002.8 1004.0 1012.2 1011.6 1014.7 997.7 DAY 9 20 21 8 20 24 22 13 15 19 25 15 MEAN QFF PRESSURE IN HPA 1021.6 1015.3 1012.6 1009.2 1004.2 997.7 996.5 999.6 1004.0 1012.0 1019.3 1025.1 1009.8 MAX. QFF PRESSURE IN HPA 1035.4 1023.6 1022.8 1016.0 1010.0 1004.2 1002.2 1006.5 1013.6 1021.1 1032.2 1032.6 1035.4 DAY 2 12 18 11 23 8 28 20 30 26 30 5 MIN. QFF PRESSURE IN HPA 1013.8 1001.9 1004.5 998.3 993.9 990.0 991.5 995.4 997.9 1008.2 1011.5 1015.7 990.0 DAY 9 20 26 8 20 24 4 13 15 19 25 15 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 919.0 914.7 913.5 913.2 911.0 906.6 905.7 908.3 910.3 915.5 918.6 922.5 913.2 MAX. QFE PRESSURE IN HPA 929.4 921.3 921.3 918.0 915.5 911.4 909.6 914.4 916.9 921.7 927.5 928.7 929.4 DAY 2 12 18 10 27 8 27 19 30 26 30 5 MIN. QFE PRESSURE IN HPA 912.2 903.9 907.3 905.9 904.1 899.1 901.8 903.7 904.5 912.5 911.4 913.8 899.1 DAY 9 20 21 8 19 24 22 13 15 31 25 15 MEAN QNH PRESSURE IN HPA 1020.3 1015.7 1014.4 1014.0 1011.6 1006.8 1005.9 1008.7 1010.9 1016.6 1020.0 1024.2 1014.1 MAX. QNH PRESSURE IN HPA 1031.7 1022.9 1022.9 1019.3 1016.6 1012.1 1010.1 1015.4 1018.1 1023.3 1029.6 1030.9 1031.7 DAY 2 12 18 10 27 8 27 19 30 26 30 5 MIN. QNH PRESSURE IN HPA 1013.0 1003.9 1007.6 1006.1 1004.2 998.7 1001.6 1003.7 1004.6 1013.3 1012.1 1014.7 998.7 DAY 9 20 21 8 19 24 22 13 15 31 25 15 MEAN QFF PRESSURE IN HPA 1022.5 1016.1 1013.5 1010.6 1005.8 999.1 998.1 1000.6 1004.9 1012.6 1020.0 1025.9 1010.8 MAX. QFF PRESSURE IN HPA 1034.8 1024.3 1024.1 1018.1 1010.7 1005.3 1003.9 1007.1 1013.7 1022.1 1033.5 1033.6 1034.8 DAY 2 12 18 10 23 16 15 19 30 26 30 5 MIN. QFF PRESSURE IN HPA 1014.4 1002.5 1006.2 1002.8 997.0 991.0 992.7 995.3 997.8 1009.0 1012.2 1015.6 991.0 DAY 9 20 21 13 19 24 3 13 15 12 25 15 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 919.0 914.9 913.7 913.5 911.4 907.2 906.6 908.7 910.9 915.7 918.7 922.4 913.5 MAX. QFE PRESSURE IN HPA 929.0 921.5 921.5 918.0 916.2 912.9 911.6 916.3 917.0 922.2 927.5 928.7 929.0 DAY 2 11 18 10 28 16 27 19 29 26 30 5 MIN. QFE PRESSURE IN HPA 912.8 904.2 907.3 907.3 904.9 898.7 902.1 904.1 905.0 912.5 911.4 913.8 898.7 DAY 9 20 21 13 19 24 22 13 15 31 25 15 MEAN QNH PRESSURE IN HPA 1020.4 1015.9 1014.6 1014.4 1012.1 1007.5 1006.8 1009.2 1011.5 1016.8 1020.1 1024.0 1014.4 MAX. QNH PRESSURE IN HPA 1031.3 1023.1 1023.1 1019.3 1017.3 1013.7 1012.3 1017.4 1018.2 1023.9 1029.6 1030.9 1031.3 DAY 2 11 18 10 28 16 27 19 29 26 30 5 MIN. QNH PRESSURE IN HPA 1013.6 1004.3 1007.6 1007.6 1005.0 998.3 1002.0 1004.2 1005.1 1013.3 1012.1 1014.7 998.3 DAY 9 20 21 13 19 24 22 13 15 31 25 15 MEAN QFF PRESSURE IN HPA 1021.9 1015.7 1013.4 1010.6 1006.1 999.7 999.0 1000.9 1005.3 1012.4 1019.6 1025.0 1010.8 MAX. QFF PRESSURE IN HPA 1034.5 1023.5 1023.8 1017.8 1011.0 1006.9 1005.7 1009.2 1014.7 1023.0 1032.9 1032.8 1034.5 DAY 2 12 18 10 22 16 27 19 29 26 30 5 MIN. QFF PRESSURE IN HPA 1014.5 1002.8 1006.5 1003.1 997.8 990.9 993.6 995.1 997.8 1008.4 1010.9 1014.6 990.9 DAY 9 20 21 13 19 24 3 13 15 12 25 15 ======================================================================================================================= 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 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 3.8 6.3 11.4 21.3 26.5 29.4 31.9 31.0 26.5 16.9 9.8 5.7 18.4 MINIMUN AIR TEMPERATURE (C) -1.9 -0.7 3.3 12.0 16.9 19.0 22.5 20.9 16.7 9.2 4.3 2.0 10.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 8 20 16 0 0 0 0 46 DAYS WITH MINIMUM TEMP. <=-4 9 4 3 0 0 0 0 0 0 0 0 0 16 DAYS WITH FREEZING MIN.<= 0 24 20 9 0 0 0 0 0 0 0 4 12 69 TEMPERATURE RECORDS LOWEST(C) -8.0 -5.0 -4.5 6.0 12.0 14.0 16.0 17.0 12.0 4.0 -1.0 -3.0 -8.0 DAY 15 4 16 2 12 14 28 20 27 30 27 31 MAXIMUM AIR TEMPERATURE (C) 10.8 14.2 19.6 29.7 35.3 38.5 40.0 39.9 35.7 25.0 16.3 10.9 26.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 14 31 30 31 31 29 2 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) 18.0 20.0 25.0 34.5 40.0 44.0 44.0 43.5 40.6 31.5 24.2 14.6 44.0 DAY 2 24 30 20 26 23 11 3 9 12 4 22 DIF. BETWEEN (MAX.-MIN.) (C) 12.7 14.9 16.3 17.7 18.4 19.5 17.5 19.0 19.0 15.8 12.0 8.9 16.0 MEAN DAILY TEMP. (MDT) (C) 4.4 6.8 11.4 20.8 26.1 28.7 31.2 30.4 26.2 17.1 10.3 6.4 18.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 23.1 157.0 232.0 317.3 291.9 155.7 0.5 0.0 0.0 1177.7 HEATING DEG. DAYS(BASE 18 0C) 420.1 325.4 204.3 4.8 0.0 0.0 0.0 0.0 0.0 43.2 232.3 358.6 1588.7 DEWPOINT (MEAN C) -3.9 -4.8 -4.9 0.9 0.3 3.2 7.1 8.6 5.6 5.2 2.7 2.7 1.9 MIXING RATIO (G/KG) 3.24 3.05 3.17 4.80 4.58 5.56 7.16 7.88 6.49 6.25 5.22 5.18 5.22 VAPOUR PRESSURE (HPA) 4.75 4.48 4.62 6.99 6.64 8.03 10.33 11.37 9.40 9.13 7.65 7.59 7.58 SATURATION DEF. (HPA) 3.71 5.69 9.92 19.73 29.95 35.79 39.34 35.98 27.38 11.22 4.99 1.78 18.79 RELATIVE HUMIDITY (MEAN %) 61 50 36 30 21 21 23 27 30 51 65 83 42 RELATIVE HUMIDITY (MAX. %) 81 73 58 52 36 35 37 42 48 72 86 94 60 RELATIVE HUMIDITY (MIN. %) 37 26 18 15 10 12 14 17 16 31 41 64 25 RELATIVE HUMIDITY (MEAN% 03UTC) 78 70 55 49 34 34 36 41 46 69 82 91 57 RELATIVE HUMIDITY (MEAN% 09UTC) 43 33 23 18 13 15 16 19 19 37 48 73 30 RELATIVE HUMIDITY (MEAN% 15UTC) 53 38 26 20 12 13 15 19 19 42 55 79 33 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 31.8 7.1 2.2 10.8 0.2 0.0 0.0 0.0 3.0 19.0 18.3 82.7 175.1 DAYS WITH PRECIPITATION >=10 1 0 0 1 0 0 0 0 0 0 1 3 6 DAYS WITH PRECIPITATION >= 5 2 1 0 1 0 0 0 0 0 2 1 5 12 DAYS WITH PRECIPITATION >= 1 3 1 1 1 0 0 0 0 1 4 4 7 22 DAYS WITH PRECIPITATION 5 4 4 3 1 0 0 0 1 4 7 9 38 GREATEST DAILY PRECIPITATION 25.0 6.0 2.1 10.4 0.2 0.0 0.0 0.0 3.0 7.7 11.0 28.0 28.0 DAY 28 14 23 21 7 ** ** ** 30 17 6 1 DAY WITH THUNDER STORM 0 0 0 1 0 0 0 0 1 0 0 0 2 DAYS WITH SNOW OR SLEET 1 0 0 0 0 0 0 0 0 0 0 0 1 DAYS WITH DUST 0 0 2 2 3 2 0 0 0 0 0 1 10 WIND DIRECTION (PREVAILING) 270 270 270 270 270 90 90 90 90 270 90 270 270 PREVAILING WIND SPEED(KNOTS) 8.9 8.5 11.4 10.4 8.6 8.4 9.2 8.3 8.2 6.1 5.6 6.8 8.8 PREVAILING WIND PERCENT 17.7 22.0 21.8 26.7 27.0 23.3 32.3 23.4 16.3 7.7 7.9 14.1 13.0 CALMS PERCENT OF WIND 67.3 51.7 48.0 39.6 33.5 52.9 50.4 56.5 65.4 73.8 78.8 77.0 57.9 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 278 286 283 285 291 69 93 92 82 357 65 280 307 VECTOR WIND MAGNITUDE(KNOTS) 1.7 3.1 2.7 4.3 3.8 1.8 3.9 2.6 1.1 0.1 0.2 1.0 0.7 WIND STEADINESES (MEAN %) 63.0 73.8 51.9 72.9 64.4 41.9 92.9 76.5 44.0 6.7 18.2 71.4 20.0 WIND SPEED (MEAN KNOTS) 2.7 4.2 5.2 5.9 5.9 4.3 4.2 3.4 2.5 1.5 1.1 1.4 3.5 FASTEST WIND DIRECTION 280 310 310 250 270 320 90 90 90 290 90 270 250 FASTEST WIND SPEED (KNOTS) 27 19 29 49 33 29 23 17 17 17 14 23 49 DAY 21 7 2 21 9 12 6 9 5 28 17 16 DAYS WITH SKY CLEAR (0-2)/8 18 21 24 16 27 30 28 26 26 20 13 11 260 DAYS WITH P.CLOUDY (3-6)/8 10 8 4 12 4 0 3 5 4 8 11 11 80 DAYS WITH CLOUDY (7-8)/8 3 0 3 2 0 0 0 0 0 3 6 9 26 DAYS WITH VISIBILITY =< 2 KM 0 0 0 1 2 1 0 0 0 1 0 12 17 DURATION OF SUNSHINE HOURS 197.3 250.3 279.3 255.3 341.4 367.7 364.3 339.2 290.7 247.3 178.5 128.9 3240.2 ======================================================================================================================= 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 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 916.9 916.8 914.2 912.8 909.5 907.5 908.2 908.8 910.8 917.3 920.6 919.1 913.5 MAX. QFE PRESSURE IN HPA 925.4 925.6 922.6 920.0 915.5 915.5 917.0 916.0 919.0 924.6 931.2 927.0 931.2 DAY-HOUR 31- 6 10-21 27- 6 2- 6 5- 6 14- 3 30- 6 23- 6 29-18 16- 6 17- 6 4- 6 MIN. QFE PRESSURE IN HPA 905.2 905.3 904.6 907.5 901.5 899.0 899.0 900.5 902.2 910.7 913.9 910.8 899.0 DAY-HOUR 21-12 7- 3 24-15 10-12 26-15 24-15 11-15 30-15 1-12 1-12 21-12 15- 9 MEAN QNH PRESSURE IN HPA 1018.1 1018.0 1015.1 1013.6 1010.0 1007.8 1008.6 1009.3 1011.4 1018.5 1022.1 1020.4 1014.4 MAX. QNH PRESSURE IN HPA 1027.3 1027.6 1024.3 1021.5 1016.6 1016.6 1018.2 1017.1 1020.4 1026.5 1033.7 1029.1 1033.7 DAY-HOUR 31- 6 10-21 27- 6 2- 6 5- 6 14- 3 30- 6 23- 6 29-18 16- 6 17- 6 4- 6 MIN. QNH PRESSURE IN HPA 1005.4 1005.5 1004.7 1007.9 1001.3 998.6 998.6 1000.2 1002.1 1011.3 1014.8 1011.5 998.6 DAY-HOUR 21-12 7- 3 24-15 10-12 26-15 24-15 11-15 30-15 1-12 1-12 21-12 15- 9 MEAN QFF PRESSURE IN HPA 1020.2 1019.2 1014.4 1009.3 1003.9 1000.7 1000.5 1001.5 1005.2 1015.6 1021.9 1021.8 1011.2 MAX. QFF PRESSURE IN HPA 1031.2 1031.0 1024.5 1019.0 1010.2 1011.8 1010.4 1009.1 1014.9 1025.1 1035.1 1031.0 1035.1 DAY-HOUR 31- 6 11- 6 16- 6 2- 6 11- 6 14- 3 31- 3 23- 6 29-18 16- 6 17- 6 4- 6 MIN. QFF PRESSURE IN HPA 1005.6 1006.5 1001.8 1003.1 994.3 991.2 989.1 992.9 994.9 1006.9 1013.9 1012.3 989.1 DAY-HOUR 21-12 7- 3 24-15 10-12 26-15 24-15 11-15 30-15 1-12 1-12 2-12 15-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 917.1 916.9 914.4 912.9 909.9 907.9 908.2 909.1 910.8 917.2 920.4 919.0 913.6 MAX. QFE PRESSURE IN HPA 925.0 925.6 920.6 917.5 914.0 914.3 916.0 913.4 916.8 922.6 928.6 924.4 928.6 DAY 31 11 1 2 7 14 31 21 30 16 17 4 MIN. QFE PRESSURE IN HPA 909.0 905.7 906.8 909.4 904.7 902.6 901.7 902.0 903.0 912.1 915.2 911.7 901.7 DAY 21 7 25 21 20 24 12 31 1 1 22 15 MEAN QNH PRESSURE IN HPA 1018.3 1018.1 1015.4 1013.7 1010.5 1008.3 1008.6 1009.6 1011.5 1018.4 1021.9 1020.3 1014.5 MAX. QNH PRESSURE IN HPA 1026.9 1027.6 1022.1 1018.7 1014.9 1015.3 1017.1 1014.3 1018.0 1024.3 1030.8 1026.3 1030.8 DAY 31 11 1 2 7 14 31 21 30 16 17 4 MIN. QNH PRESSURE IN HPA 1009.5 1005.9 1007.1 1009.9 1004.8 1002.5 1001.5 1001.9 1003.0 1012.9 1016.2 1012.4 1001.5 DAY 21 7 25 21 20 24 12 31 1 1 22 15 MEAN QFF PRESSURE IN HPA 1019.9 1018.9 1014.4 1009.3 1004.3 1001.1 1000.4 1001.6 1004.9 1015.2 1021.3 1021.3 1011.1 MAX. QFF PRESSURE IN HPA 1028.8 1029.7 1022.8 1016.1 1008.9 1010.5 1009.9 1007.4 1013.1 1022.9 1031.7 1027.0 1031.7 DAY 31 11 1 2 3 14 31 21 30 16 17 4 MIN. QFF PRESSURE IN HPA 1010.6 1006.6 1004.0 1003.8 998.0 994.6 991.8 994.1 995.5 1008.9 1015.3 1013.2 991.8 DAY 21 7 25 21 20 24 12 31 1 1 22 15 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 917.2 917.2 915.1 913.8 911.0 909.2 909.7 910.5 912.0 917.9 920.8 919.0 914.5 MAX. QFE PRESSURE IN HPA 924.7 925.0 921.5 918.4 914.0 915.5 916.5 914.7 916.9 923.1 930.2 925.3 930.2 DAY 31 11 27 2 5 14 31 23 26 16 17 4 MIN. QFE PRESSURE IN HPA 907.9 905.3 908.5 910.0 906.3 903.5 902.0 903.7 904.0 913.4 915.3 911.2 902.0 DAY 21 7 24 10 20 24 11 31 1 1 22 15 MEAN QNH PRESSURE IN HPA 1018.4 1018.4 1016.2 1014.7 1011.7 1009.7 1010.3 1011.2 1012.8 1019.2 1022.3 1020.4 1015.4 MAX. QNH PRESSURE IN HPA 1026.6 1026.9 1023.1 1019.7 1014.9 1016.6 1017.7 1015.7 1018.1 1024.8 1032.6 1027.2 1032.6 DAY 31 11 27 2 5 14 31 23 26 16 17 4 MIN. QNH PRESSURE IN HPA 1008.3 1005.5 1008.9 1010.6 1006.6 1003.5 1001.9 1003.7 1004.0 1014.3 1016.3 1011.9 1001.9 DAY 21 7 24 10 20 24 11 31 1 1 22 15 MEAN QFF PRESSURE IN HPA 1021.0 1020.1 1016.0 1010.9 1005.8 1002.8 1002.5 1003.8 1007.0 1016.8 1022.5 1022.0 1012.6 MAX. QFF PRESSURE IN HPA 1030.1 1029.9 1024.4 1017.9 1010.0 1011.8 1010.4 1008.5 1013.6 1023.6 1034.0 1028.6 1034.0 DAY 31 11 16 2 11 14 31 20 26 16 17 4 MIN. QFF PRESSURE IN HPA 1010.4 1006.5 1006.8 1005.1 1000.0 996.1 992.8 996.8 997.3 1010.3 1016.5 1012.9 992.8 DAY 21 7 24 21 20 24 11 31 1 1 22 15 ======================================================================================================================= 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 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 918.4 918.3 916.3 914.8 911.7 909.7 910.4 911.3 913.0 919.0 922.0 920.2 915.4 MAX. QFE PRESSURE IN HPA 925.4 925.5 922.6 920.0 915.5 915.5 917.0 916.0 918.2 924.6 931.2 927.0 931.2 DAY 31 11 27 2 5 16 30 23 29 16 17 4 MIN. QFE PRESSURE IN HPA 908.5 907.3 907.7 909.8 907.0 903.5 902.9 905.0 905.4 914.0 916.9 912.1 902.9 DAY 21 7 24 10 26 24 11 31 1 1 22 15 MEAN QNH PRESSURE IN HPA 1019.7 1019.6 1017.4 1015.8 1012.4 1010.3 1011.0 1012.0 1013.9 1020.4 1023.7 1021.6 1016.5 MAX. QNH PRESSURE IN HPA 1027.3 1027.5 1024.3 1021.5 1016.6 1016.6 1018.2 1017.1 1019.5 1026.5 1033.7 1029.1 1033.7 DAY 31 11 27 2 5 16 30 23 29 16 17 4 MIN. QNH PRESSURE IN HPA 1008.9 1007.6 1008.1 1010.4 1007.3 1003.5 1002.8 1005.1 1005.6 1014.9 1018.1 1012.9 1002.8 DAY 21 7 24 10 26 24 11 31 1 1 22 15 MEAN QFF PRESSURE IN HPA 1022.2 1021.3 1016.8 1011.4 1006.1 1003.1 1002.8 1004.2 1007.5 1017.6 1023.7 1023.3 1013.3 MAX. QFF PRESSURE IN HPA 1031.2 1031.0 1024.5 1019.0 1010.2 1011.4 1010.2 1009.1 1013.8 1025.1 1035.1 1031.0 1035.1 DAY 31 11 16 2 11 14 31 23 30 16 17 4 MIN. QFF PRESSURE IN HPA 1011.4 1008.9 1005.8 1005.7 1000.0 995.3 993.7 997.7 997.9 1010.3 1017.4 1014.0 993.7 DAY 21 7 24 10 26 24 11 31 1 1 3 15 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 917.0 917.2 914.8 913.3 909.9 908.2 909.0 909.7 911.4 917.6 920.8 919.1 914.0 MAX. QFE PRESSURE IN HPA 924.4 924.0 920.7 918.6 914.1 914.3 915.7 913.8 917.8 923.6 929.8 926.0 929.8 DAY 31 11 27 2 5 16 30 20 29 16 17 4 MIN. QFE PRESSURE IN HPA 907.0 907.3 905.7 908.3 905.3 902.0 901.5 904.0 903.8 912.4 915.6 910.8 901.5 DAY 21 7 24 10 26 24 11 31 1 1 21 15 MEAN QNH PRESSURE IN HPA 1018.2 1018.4 1015.8 1014.2 1010.5 1008.6 1009.5 1010.2 1012.1 1018.8 1022.4 1020.5 1014.9 MAX. QNH PRESSURE IN HPA 1026.3 1025.8 1022.2 1019.9 1015.0 1015.3 1016.8 1014.7 1019.1 1025.4 1032.1 1028.0 1032.1 DAY 31 11 27 2 5 16 30 20 29 16 17 4 MIN. QNH PRESSURE IN HPA 1007.3 1007.6 1005.9 1008.7 1005.5 1001.9 1001.3 1004.0 1003.8 1013.2 1016.7 1011.5 1001.3 DAY 21 7 24 10 26 24 11 31 1 1 21 15 MEAN QFF PRESSURE IN HPA 1020.1 1019.4 1014.8 1009.5 1004.2 1001.4 1001.3 1002.3 1005.5 1015.6 1021.9 1021.6 1011.5 MAX. QFF PRESSURE IN HPA 1028.9 1028.1 1022.5 1017.2 1008.7 1009.4 1008.8 1007.3 1013.4 1023.8 1033.3 1029.5 1033.3 DAY 31 10 16 2 11 16 30 20 29 16 17 4 MIN. QFF PRESSURE IN HPA 1008.0 1009.3 1003.4 1003.2 998.2 993.5 991.9 996.3 996.2 1008.5 1015.4 1012.5 991.9 DAY 21 7 24 10 26 24 11 31 1 1 3 15 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 915.6 915.4 912.5 911.2 907.9 906.0 906.9 907.4 909.2 916.0 919.5 918.2 912.1 MAX. QFE PRESSURE IN HPA 923.1 922.7 917.8 916.0 912.0 911.8 914.0 911.8 917.2 922.8 927.9 924.5 927.9 DAY 30 10 3 2 5 16 30 20 29 16 17 4 MIN. QFE PRESSURE IN HPA 905.2 907.2 905.0 907.5 902.7 899.8 899.5 901.5 902.2 910.7 913.9 910.8 899.5 DAY 21 7 24 10 26 24 11 30 1 1 21 15 MEAN QNH PRESSURE IN HPA 1016.6 1016.5 1013.3 1011.9 1008.3 1006.3 1007.2 1007.7 1009.7 1017.1 1021.0 1019.5 1012.9 MAX. QNH PRESSURE IN HPA 1024.8 1024.4 1019.1 1017.1 1012.8 1012.5 1014.9 1012.5 1018.4 1024.5 1030.1 1026.4 1030.1 DAY 30 10 3 2 5 16 30 20 29 16 17 4 MIN. QNH PRESSURE IN HPA 1005.4 1007.5 1005.1 1007.9 1002.6 999.5 999.1 1001.3 1002.1 1011.3 1014.8 1011.5 999.1 DAY 21 7 24 10 26 24 11 30 1 1 21 15 MEAN QFF PRESSURE IN HPA 1018.3 1017.3 1012.2 1007.5 1002.1 999.0 999.0 999.8 1003.2 1013.9 1020.5 1020.5 1009.4 MAX. QFF PRESSURE IN HPA 1026.7 1026.6 1019.9 1014.4 1006.5 1006.5 1007.4 1005.3 1013.0 1022.8 1031.2 1027.5 1031.2 DAY 30 10 3 2 7 13 30 20 29 16 17 4 MIN. QFF PRESSURE IN HPA 1005.6 1009.0 1002.1 1003.1 995.3 991.8 989.5 993.6 994.9 1006.9 1013.9 1012.3 989.5 DAY 21 7 24 10 26 24 11 30 1 1 2 15 ======================================================================================================================= 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 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 916.1 915.7 912.6 911.1 907.3 905.2 906.2 906.6 908.8 916.2 920.0 918.9 912.1 MAX. QFE PRESSURE IN HPA 923.7 923.2 918.9 915.1 911.5 910.9 913.5 911.5 917.9 922.5 927.8 925.0 927.8 DAY 30 10 3 4 7 16 30 20 29 16 17 4 MIN. QFE PRESSURE IN HPA 905.6 908.8 904.6 908.2 901.5 899.0 899.0 900.5 902.2 911.3 914.6 911.8 899.0 DAY 21 6 24 22 26 24 11 30 1 12 21 15 MEAN QNH PRESSURE IN HPA 1017.2 1016.8 1013.4 1011.7 1007.6 1005.4 1006.4 1006.9 1009.3 1017.3 1021.5 1020.2 1012.8 MAX. QNH PRESSURE IN HPA 1025.5 1024.9 1020.3 1016.1 1012.2 1011.6 1014.4 1012.2 1019.2 1024.2 1030.0 1026.9 1030.0 DAY 30 10 3 4 7 16 30 20 29 16 17 4 MIN. QNH PRESSURE IN HPA 1005.8 1009.3 1004.7 1008.6 1001.3 998.6 998.6 1000.2 1002.1 1012.0 1015.6 1012.5 998.6 DAY 21 6 24 22 26 24 11 30 1 12 21 15 MEAN QFF PRESSURE IN HPA 1019.7 1018.5 1013.1 1007.9 1001.7 998.4 998.6 999.4 1003.6 1015.0 1021.7 1021.7 1009.9 MAX. QFF PRESSURE IN HPA 1028.3 1028.0 1021.6 1013.9 1006.8 1006.0 1007.6 1005.7 1014.3 1022.6 1031.7 1028.3 1031.7 DAY 30 10 3 1 2 13 30 20 29 16 17 4 MIN. QFF PRESSURE IN HPA 1007.1 1010.1 1001.8 1004.0 994.3 991.2 989.1 992.9 995.5 1008.3 1015.0 1013.6 989.1 DAY 21 25 24 20 26 24 11 30 1 12 1 15 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 916.9 916.8 913.8 912.7 908.9 906.5 907.4 907.8 910.4 917.1 920.6 919.3 913.2 MAX. QFE PRESSURE IN HPA 925.3 924.5 920.1 917.2 913.0 912.6 914.0 913.0 919.0 922.9 928.2 925.0 928.2 DAY 30 10 3 4 7 16 30 20 29 15 16 4 MIN. QFE PRESSURE IN HPA 907.3 907.7 904.7 910.1 903.2 901.7 900.2 902.0 903.2 913.1 915.2 912.3 900.2 DAY 21 6 24 6 26 24 11 30 1 1 21 15 MEAN QNH PRESSURE IN HPA 1018.1 1018.0 1014.7 1013.5 1009.4 1006.8 1007.7 1008.1 1011.0 1018.3 1022.2 1020.6 1014.0 MAX. QNH PRESSURE IN HPA 1027.2 1026.4 1021.6 1018.4 1013.8 1013.4 1014.9 1013.8 1020.4 1024.6 1030.4 1026.9 1030.4 DAY 30 10 3 4 7 16 30 20 29 15 16 4 MIN. QNH PRESSURE IN HPA 1007.6 1008.1 1004.8 1010.7 1003.2 1001.5 999.9 1001.9 1003.2 1014.0 1016.2 1013.1 999.9 DAY 21 6 24 6 26 24 11 30 1 1 21 15 MEAN QFF PRESSURE IN HPA 1020.6 1019.6 1014.0 1009.0 1003.1 999.5 999.4 1000.2 1004.7 1015.5 1022.2 1022.3 1010.8 MAX. QFF PRESSURE IN HPA 1030.4 1029.7 1022.6 1015.7 1008.1 1008.9 1007.2 1006.5 1014.9 1023.3 1031.0 1028.3 1031.0 DAY 30 10 3 1 2 13 30 20 29 15 16 4 MIN. QFF PRESSURE IN HPA 1008.8 1010.2 1001.9 1004.8 995.4 993.7 990.3 993.9 996.0 1009.8 1015.7 1014.7 990.3 DAY 21 6 24 30 26 24 11 30 1 1 2 15 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 916.9 917.0 914.1 912.9 909.6 907.3 907.9 908.3 910.9 917.3 920.7 919.0 913.5 MAX. QFE PRESSURE IN HPA 925.3 925.6 920.1 917.5 914.0 914.0 915.0 912.7 917.5 922.6 928.6 924.3 928.6 DAY 30 10 3 1 6 13 30 20 29 15 16 4 MIN. QFE PRESSURE IN HPA 909.5 906.9 905.2 909.9 904.7 902.6 900.8 902.0 904.0 913.1 915.2 912.5 900.8 DAY 20 6 24 9 19 23 11 30 1 13 21 15 MEAN QNH PRESSURE IN HPA 1018.1 1018.2 1015.1 1013.7 1010.1 1007.6 1008.3 1008.7 1011.5 1018.5 1022.2 1020.3 1014.4 MAX. QNH PRESSURE IN HPA 1027.2 1027.6 1021.6 1018.7 1014.9 1014.9 1016.0 1013.5 1018.7 1024.3 1030.8 1026.1 1030.8 DAY 30 10 3 1 6 13 30 20 29 15 16 4 MIN. QNH PRESSURE IN HPA 1010.0 1007.2 1005.4 1010.5 1004.8 1002.5 1000.6 1001.9 1004.0 1014.0 1016.2 1013.3 1000.6 DAY 20 6 24 9 19 23 11 30 1 13 21 15 MEAN QFF PRESSURE IN HPA 1020.0 1019.1 1014.0 1008.9 1003.8 1000.3 1000.2 1000.8 1004.9 1015.3 1021.8 1021.5 1010.9 MAX. QFF PRESSURE IN HPA 1029.4 1030.0 1022.4 1015.8 1008.3 1010.3 1008.4 1005.8 1013.6 1023.0 1031.6 1027.4 1031.6 DAY 30 10 3 1 2 13 30 20 29 4 16 4 MIN. QFF PRESSURE IN HPA 1010.1 1008.6 1002.1 1004.4 997.3 994.2 990.6 994.1 996.7 1009.4 1014.5 1014.9 990.6 DAY 21 6 24 20 26 23 11 30 1 13 2 15 ======================================================================================================================= 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 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 3.6 6.8 14.1 21.0 24.9 29.6 31.7 30.9 26.2 19.3 11.1 7.4 18.9 MINIMUN AIR TEMPERATURE (C) -1.9 0.2 6.0 12.1 15.8 19.6 23.1 20.6 16.9 11.1 4.0 2.7 10.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 12 28 15 0 0 0 0 56 DAYS WITH MINIMUM TEMP. <=-4 5 1 0 0 0 0 0 0 0 0 2 0 8 DAYS WITH FREEZING MIN.<= 0 25 12 2 0 0 0 0 0 0 0 5 8 52 TEMPERATURE RECORDS LOWEST(C) -10.0 -5.0 -1.4 7.0 12.0 14.5 18.0 16.0 13.0 6.0 -4.4 -3.5 -10.0 DAY 29 1 12 14 5 13 31 1 16 30 21 22 MAXIMUM AIR TEMPERATURE (C) 10.4 14.4 22.4 29.8 33.1 38.2 39.3 40.1 35.0 28.2 19.4 13.4 27.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 1 19 24 29 31 31 26 10 0 0 171 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 19.6 22.6 30.0 34.0 39.0 44.0 44.5 43.5 39.0 33.0 27.5 20.5 44.5 DAY 15 28 31 26 15 27 9 3 4 7 6 31 DIF. BETWEEN (MAX.-MIN.) (C) 12.3 14.2 16.4 17.7 17.3 18.6 16.2 19.5 18.1 17.1 15.4 10.7 16.1 MEAN DAILY TEMP. (MDT) (C) 4.3 7.3 14.2 20.9 24.4 28.9 31.2 30.3 25.9 19.6 11.7 8.0 18.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 24.6 113.8 238.0 317.4 288.5 149.4 9.3 0.0 0.0 1141.2 HEATING DEG. DAYS(BASE 18 0C) 425.6 298.4 123.7 2.0 0.0 0.0 0.0 0.0 0.0 12.1 188.9 308.5 1359.3 DEWPOINT (MEAN C) -2.1 -1.4 1.4 3.8 5.0 9.6 9.4 10.2 3.9 4.5 -0.3 3.2 3.9 MIXING RATIO (G/KG) 3.65 3.84 4.77 5.61 6.27 8.65 8.36 9.26 5.76 5.96 4.28 5.37 5.98 VAPOUR PRESSURE (HPA) 5.37 5.63 6.95 8.15 9.08 12.43 12.01 13.30 8.37 8.68 6.26 7.88 8.68 SATURATION DEF. (HPA) 3.03 4.80 10.38 18.27 24.42 31.88 36.68 34.24 27.80 15.20 8.03 2.79 18.13 RELATIVE HUMIDITY (MEAN %) 70 61 47 35 33 33 28 30 26 41 50 77 44 RELATIVE HUMIDITY (MAX. %) 88 83 73 56 53 52 44 45 43 59 73 92 63 RELATIVE HUMIDITY (MIN. %) 48 34 25 20 17 20 16 19 15 26 27 55 27 RELATIVE HUMIDITY (MEAN% 03UTC) 83 81 67 53 50 47 43 43 42 56 67 90 60 RELATIVE HUMIDITY (MEAN% 09UTC) 55 41 31 23 21 23 20 23 17 28 32 63 31 RELATIVE HUMIDITY (MEAN% 15UTC) 60 50 33 24 23 23 18 22 18 33 40 71 35 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 37.6 10.3 14.3 1.0 16.3 9.0 0.0 0.0 1.0 0.9 9.9 51.2 151.5 DAYS WITH PRECIPITATION >=10 1 0 0 0 0 0 0 0 0 0 0 3 4 DAYS WITH PRECIPITATION >= 5 3 1 1 0 2 1 0 0 0 0 1 4 13 DAYS WITH PRECIPITATION >= 1 6 3 3 0 2 2 0 0 1 0 2 5 24 DAYS WITH PRECIPITATION 8 3 5 2 6 2 0 0 2 2 4 11 45 GREATEST DAILY PRECIPITATION 18.4 7.0 8.0 1.0 8.0 7.0 0.0 0.0 1.0 0.6 7.0 15.0 18.4 DAY 24 19 10 24 3 12 ** ** 21 23 12 1 DAY WITH THUNDER STORM 0 0 1 0 1 0 0 0 2 0 0 0 4 DAYS WITH SNOW OR SLEET 5 0 0 0 0 0 0 0 0 0 0 0 5 DAYS WITH DUST 1 1 0 1 2 1 0 2 0 0 1 0 9 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 90 90 270 270 270 PREVAILING WIND SPEED(KNOTS) 6.1 8.2 7.9 9.3 8.9 8.4 9.7 7.2 7.9 7.0 7.6 6.3 8.1 PREVAILING WIND PERCENT 9.7 20.1 16.5 24.6 19.0 13.3 27.4 19.8 12.9 9.3 11.7 6.5 12.5 CALMS PERCENT OF WIND 78.6 58.5 59.7 49.2 48.4 51.7 51.2 55.2 59.2 68.1 76.3 85.1 61.8 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 289 285 288 284 283 354 92 73 354 316 284 282 300 VECTOR WIND MAGNITUDE(KNOTS) 0.6 2.4 2.3 2.9 2.2 0.6 3.0 1.0 0.4 0.5 1.4 0.4 0.8 WIND STEADINESES (MEAN %) 40.0 72.7 74.2 67.4 50.0 15.8 69.8 31.3 12.5 20.8 73.7 50.0 26.7 WIND SPEED (MEAN KNOTS) 1.5 3.3 3.1 4.3 4.4 3.8 4.3 3.2 3.2 2.4 1.9 0.8 3.0 FASTEST WIND DIRECTION 290 240 310 280 290 330 80 310 280 280 290 280 240 FASTEST WIND SPEED (KNOTS) 19 31 19 29 29 17 17 19 19 29 23 14 31 DAY 5 21 10 15 5 10 5 27 23 2 19 5 DAYS WITH SKY CLEAR (0-2)/8 16 18 15 17 19 28 29 29 26 24 17 12 250 DAYS WITH P.CLOUDY (3-6)/8 10 6 13 11 12 1 2 2 4 6 11 12 90 DAYS WITH CLOUDY (7-8)/8 5 4 3 2 0 1 0 0 0 1 2 7 25 DAYS WITH VISIBILITY =< 2 KM 5 0 0 0 0 0 0 0 1 0 0 3 9 DURATION OF SUNSHINE HOURS 184.2 219.4 260.3 282.1 317.8 363.0 352.7 349.4 303.7 274.8 210.0 147.7 3265.1 ======================================================================================================================= 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 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 920.0 916.6 914.2 912.3 909.9 906.9 906.6 909.3 912.5 916.1 917.9 919.9 913.5 MAX. QFE PRESSURE IN HPA 925.4 926.9 924.2 922.0 915.2 916.7 914.5 916.4 922.1 925.9 926.5 925.5 926.9 DAY-HOUR 29- 6 9- 6 1- 6 2- 6 1- 6 2- 6 28- 6 14- 6 22- 6 10- 6 20- 6 22- 6 MIN. QFE PRESSURE IN HPA 914.0 900.2 902.7 903.7 901.4 899.0 898.4 902.3 903.9 910.5 904.7 912.4 898.4 DAY-HOUR 19-12 21-12 25- 0 26-12 29-15 17-15 10-15 27-12 5-15 1-12 18-15 5-12 MEAN QNH PRESSURE IN HPA 1021.4 1017.7 1015.1 1013.0 1010.4 1007.2 1006.9 1009.8 1013.3 1017.3 1019.2 1021.3 1014.4 MAX. QNH PRESSURE IN HPA 1027.3 1029.0 1026.0 1023.6 1016.2 1017.9 1015.5 1017.5 1023.8 1027.9 1028.5 1027.5 1029.0 DAY-HOUR 29- 6 9- 6 1- 6 2- 6 1- 6 2- 6 28- 6 14- 6 22- 6 10- 6 20- 6 22- 6 MIN. QNH PRESSURE IN HPA 1014.9 999.9 1002.6 1003.7 1001.2 998.6 997.9 1002.2 1003.9 1011.1 1004.8 1013.2 997.9 DAY-HOUR 19-12 21-12 25- 0 26-12 29-15 17-15 10-15 27-12 5-15 1-12 18-15 5-12 MEAN QFF PRESSURE IN HPA 1023.7 1018.7 1013.3 1008.7 1004.7 999.8 998.8 1002.0 1007.2 1013.5 1018.5 1022.1 1010.9 MAX. QFF PRESSURE IN HPA 1033.3 1031.5 1026.0 1019.6 1012.0 1011.4 1007.1 1010.8 1019.8 1023.9 1031.5 1030.1 1033.3 DAY-HOUR 29- 6 9- 6 12- 3 2- 6 5-15 2- 6 29- 6 14- 6 22- 6 10- 6 20- 6 22- 6 MIN. QFF PRESSURE IN HPA 1016.6 999.3 998.3 997.5 994.9 990.8 989.0 994.3 996.6 1005.4 1003.1 1013.9 989.0 DAY-HOUR 4-12 21-12 25- 0 26-12 29-15 17-15 10-15 27-12 5-15 1-12 18-15 5-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 919.8 916.6 914.2 912.5 910.1 907.1 906.7 909.4 912.4 916.1 917.7 919.9 913.5 MAX. QFE PRESSURE IN HPA 924.3 925.2 922.4 920.4 914.0 914.0 912.3 914.5 919.0 923.0 923.5 924.0 925.2 DAY 30 10 2 2 23 2 28 12 22 10 20 23 MIN. QFE PRESSURE IN HPA 915.9 905.2 902.7 907.3 903.0 900.7 900.3 904.2 906.7 911.3 906.9 914.2 900.3 DAY 4 21 25 9 30 18 11 24 5 1 18 5 MEAN QNH PRESSURE IN HPA 1021.3 1017.7 1015.1 1013.3 1010.7 1007.4 1007.0 1010.0 1013.2 1017.3 1019.0 1021.3 1014.4 MAX. QNH PRESSURE IN HPA 1026.1 1027.1 1024.1 1021.9 1014.9 1014.9 1013.1 1015.5 1020.4 1024.7 1025.3 1025.8 1027.1 DAY 30 10 2 2 23 2 28 12 22 10 20 23 MIN. QNH PRESSURE IN HPA 1017.0 1005.4 1002.6 1007.6 1003.0 1000.5 1000.0 1004.3 1007.0 1012.0 1007.2 1015.2 1000.0 DAY 4 21 25 9 30 18 11 24 5 1 18 5 MEAN QFF PRESSURE IN HPA 1023.2 1018.4 1013.1 1008.8 1005.0 1000.1 998.8 1002.0 1006.9 1013.1 1017.9 1021.7 1010.8 MAX. QFF PRESSURE IN HPA 1031.5 1028.5 1024.7 1017.2 1009.5 1010.1 1005.3 1008.0 1016.5 1021.8 1027.6 1027.5 1031.5 DAY 30 10 12 2 6 13 28 12 22 28 20 23 MIN. QFF PRESSURE IN HPA 1017.7 1005.2 998.3 1002.2 995.7 993.0 991.0 996.4 999.8 1005.9 1004.8 1015.8 991.0 DAY 4 21 25 26 30 18 11 24 5 1 18 5 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 920.0 917.1 915.1 913.3 911.2 908.5 908.3 911.0 913.7 917.0 918.4 920.1 914.5 MAX. QFE PRESSURE IN HPA 924.5 925.3 922.6 921.2 914.5 915.8 913.3 915.2 920.7 924.5 924.7 923.9 925.3 DAY 30 10 2 2 1 2 28 12 22 10 20 10 MIN. QFE PRESSURE IN HPA 915.3 904.8 903.7 907.8 904.3 901.7 902.6 905.0 908.0 911.8 907.1 913.9 901.7 DAY 19 21 25 26 30 18 11 27 5 1 18 5 MEAN QNH PRESSURE IN HPA 1021.5 1018.3 1016.1 1014.2 1011.8 1009.0 1008.7 1011.6 1014.6 1018.2 1019.7 1021.6 1015.4 MAX. QNH PRESSURE IN HPA 1026.4 1027.2 1024.3 1022.8 1015.5 1016.9 1014.2 1016.2 1022.2 1026.4 1026.6 1025.7 1027.2 DAY 30 10 2 2 1 2 28 12 22 10 20 10 MIN. QNH PRESSURE IN HPA 1016.3 1004.9 1003.7 1008.2 1004.4 1001.5 1002.5 1005.1 1008.4 1012.5 1007.4 1014.8 1001.5 DAY 19 21 25 26 30 18 11 27 5 1 18 5 MEAN QFF PRESSURE IN HPA 1024.1 1019.8 1014.7 1010.2 1006.5 1001.8 1000.8 1004.2 1009.0 1015.0 1019.6 1022.7 1012.4 MAX. QFF PRESSURE IN HPA 1032.5 1029.2 1026.0 1019.1 1011.0 1011.1 1006.7 1009.6 1019.0 1023.0 1030.5 1028.5 1032.5 DAY 30 10 12 2 1 2 30 14 22 10 20 22 MIN. QFF PRESSURE IN HPA 1018.1 1005.5 999.8 1002.5 997.5 994.3 993.6 997.9 1001.5 1007.9 1005.5 1016.2 993.6 DAY 4 21 25 26 30 18 11 27 5 1 18 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 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 921.3 918.1 916.1 914.2 911.7 909.1 908.8 911.8 914.6 918.1 919.5 921.4 915.4 MAX. QFE PRESSURE IN HPA 925.4 926.9 924.2 922.0 915.2 916.7 914.5 916.4 922.1 925.9 926.5 925.5 926.9 DAY 29 9 1 2 1 2 28 14 22 10 20 22 MIN. QFE PRESSURE IN HPA 916.2 904.8 903.7 908.0 904.5 903.3 903.4 905.8 909.0 912.3 907.0 914.8 903.3 DAY 19 21 25 12 30 18 11 27 5 1 18 5 MEAN QNH PRESSURE IN HPA 1022.8 1019.4 1017.2 1015.2 1012.4 1009.5 1009.3 1012.5 1015.6 1019.4 1020.9 1023.0 1016.4 MAX. QNH PRESSURE IN HPA 1027.3 1029.0 1026.0 1023.6 1016.2 1017.9 1015.5 1017.5 1023.8 1027.9 1028.5 1027.5 1029.0 DAY 29 9 1 2 1 2 28 14 22 10 20 22 MIN. QNH PRESSURE IN HPA 1017.3 1004.9 1003.7 1008.4 1004.6 1003.3 1003.4 1006.0 1009.5 1013.1 1007.3 1015.8 1003.3 DAY 19 21 25 12 30 18 11 27 5 1 18 5 MEAN QFF PRESSURE IN HPA 1025.6 1020.8 1015.6 1010.8 1006.6 1002.0 1001.2 1004.5 1009.4 1015.8 1020.5 1024.1 1013.1 MAX. QFF PRESSURE IN HPA 1033.3 1031.5 1025.9 1019.6 1011.3 1011.4 1007.1 1010.8 1019.8 1023.9 1031.5 1030.1 1033.3 DAY 29 9 12 2 19 2 29 14 22 10 20 22 MIN. QFF PRESSURE IN HPA 1019.0 1004.8 1000.6 1002.6 997.0 995.0 994.3 998.3 1001.8 1007.0 1004.9 1017.0 994.3 DAY 4 21 25 26 30 18 10 24 5 1 18 5 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 920.3 917.1 914.8 912.7 910.3 907.6 907.5 910.2 913.1 916.5 918.0 919.9 914.0 MAX. QFE PRESSURE IN HPA 924.3 926.8 923.4 920.6 913.7 915.0 913.1 915.0 920.5 924.5 925.0 924.4 926.8 DAY 29 9 1 2 19 2 29 14 22 10 20 9 MIN. QFE PRESSURE IN HPA 915.0 902.6 902.9 905.6 903.5 901.4 902.0 904.1 906.9 912.1 905.6 913.4 901.4 DAY 19 21 25 26 30 18 10 27 5 1 18 5 MEAN QNH PRESSURE IN HPA 1021.8 1018.3 1015.8 1013.6 1010.9 1008.0 1007.8 1010.8 1014.0 1017.6 1019.3 1021.4 1014.9 MAX. QNH PRESSURE IN HPA 1026.1 1028.9 1025.2 1022.1 1014.6 1016.0 1014.0 1016.0 1022.0 1026.4 1026.9 1026.3 1028.9 DAY 29 9 1 2 19 2 29 14 22 10 20 9 MIN. QNH PRESSURE IN HPA 1016.0 1002.5 1002.8 1005.8 1003.5 1001.2 1001.9 1004.2 1007.2 1012.9 1005.8 1014.3 1001.2 DAY 19 21 25 26 30 18 10 27 5 1 18 5 MEAN QFF PRESSURE IN HPA 1023.9 1019.0 1013.7 1009.0 1004.9 1000.5 999.6 1002.7 1007.7 1013.5 1018.1 1021.8 1011.2 MAX. QFF PRESSURE IN HPA 1031.4 1030.6 1024.1 1017.9 1009.4 1009.6 1005.9 1008.7 1017.6 1022.8 1029.1 1027.4 1031.4 DAY 29 9 11 2 5 12 29 14 22 10 20 22 MIN. QFF PRESSURE IN HPA 1018.0 1001.9 999.4 999.2 996.4 992.9 992.2 996.3 999.4 1007.0 1003.5 1015.1 992.2 DAY 4 21 25 26 30 18 9 27 5 1 18 5 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 919.0 915.3 912.7 910.6 908.3 905.6 905.2 907.8 910.9 914.6 916.7 918.8 912.1 MAX. QFE PRESSURE IN HPA 923.3 926.1 921.7 918.4 913.0 912.6 911.0 912.9 917.9 922.5 923.5 923.4 926.1 DAY 29 9 1 2 5 12 28 14 22 10 20 9 MIN. QFE PRESSURE IN HPA 914.0 900.2 902.9 903.7 902.8 899.6 899.3 902.3 904.9 910.5 904.9 912.4 899.3 DAY 19 21 25 26 29 17 10 27 5 1 18 5 MEAN QNH PRESSURE IN HPA 1020.3 1016.3 1013.6 1011.2 1008.8 1005.8 1005.4 1008.2 1011.6 1015.6 1017.9 1020.1 1012.9 MAX. QNH PRESSURE IN HPA 1025.1 1028.1 1023.3 1019.7 1013.8 1013.4 1011.7 1013.7 1019.2 1024.2 1025.3 1025.2 1028.1 DAY 29 9 1 2 5 12 28 14 22 10 20 9 MIN. QNH PRESSURE IN HPA 1014.9 999.9 1002.8 1003.7 1002.7 999.3 998.9 1002.2 1005.0 1011.1 1005.0 1013.2 998.9 DAY 19 21 25 26 29 17 10 27 5 1 18 5 MEAN QFF PRESSURE IN HPA 1022.2 1016.9 1011.5 1006.7 1003.0 998.5 997.3 1000.1 1005.2 1011.4 1016.9 1020.4 1009.2 MAX. QFF PRESSURE IN HPA 1030.2 1030.1 1022.3 1015.2 1009.6 1009.9 1003.8 1006.6 1014.6 1020.4 1027.4 1025.2 1030.2 DAY 29 9 11 2 5 12 28 14 22 10 20 22 MIN. QFF PRESSURE IN HPA 1016.6 999.3 1000.9 997.5 995.8 991.2 989.4 994.3 997.5 1005.4 1003.2 1013.9 989.4 DAY 4 21 24 26 30 17 9 27 5 1 18 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 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 919.4 915.5 912.8 910.3 908.1 904.9 904.5 907.2 910.6 914.7 917.3 919.4 912.1 MAX. QFE PRESSURE IN HPA 924.3 925.8 922.1 918.0 913.7 912.6 910.4 912.2 918.6 922.2 923.5 923.4 925.8 DAY 29 9 1 1 5 12 29 14 22 10 20 9 MIN. QFE PRESSURE IN HPA 914.7 901.5 903.2 904.0 901.4 899.0 898.4 902.3 903.9 910.6 904.7 913.4 898.4 DAY 19 21 25 12 29 17 10 27 5 1 18 5 MEAN QNH PRESSURE IN HPA 1020.8 1016.6 1013.6 1010.9 1008.5 1005.1 1004.6 1007.6 1011.3 1015.7 1018.6 1020.8 1012.8 MAX. QNH PRESSURE IN HPA 1026.1 1027.8 1023.8 1019.3 1014.6 1013.4 1011.0 1013.0 1019.9 1023.9 1025.3 1025.2 1027.8 DAY 29 9 1 1 5 12 29 14 22 10 20 9 MIN. QNH PRESSURE IN HPA 1015.7 1001.3 1003.2 1004.0 1001.2 998.6 997.9 1002.2 1003.9 1011.2 1004.8 1014.3 997.9 DAY 19 21 25 12 29 17 10 27 5 1 18 5 MEAN QFF PRESSURE IN HPA 1023.4 1017.9 1012.1 1007.0 1003.1 997.8 996.7 1000.0 1005.6 1012.5 1018.5 1021.8 1009.7 MAX. QFF PRESSURE IN HPA 1032.4 1030.2 1023.5 1015.4 1012.0 1010.0 1002.8 1006.3 1016.1 1020.8 1028.6 1027.5 1032.4 DAY 29 9 1 2 5 12 29 14 22 27 20 22 MIN. QFF PRESSURE IN HPA 1017.4 1002.4 1000.9 1000.7 994.9 990.8 989.0 994.9 996.6 1007.5 1003.1 1015.6 989.0 DAY 4 21 25 26 29 17 10 27 5 1 18 5 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 920.0 916.4 913.9 912.0 909.5 906.1 905.7 908.4 912.0 916.0 918.0 919.9 913.2 MAX. QFE PRESSURE IN HPA 924.7 926.2 922.6 920.0 914.1 912.9 911.1 913.2 919.0 922.8 923.5 924.0 926.2 DAY 29 9 1 1 5 12 29 11 21 10 20 22 MIN. QFE PRESSURE IN HPA 915.7 903.9 904.1 906.0 902.3 899.9 899.5 904.1 905.9 911.0 904.9 914.1 899.5 DAY 19 21 25 12 29 17 10 23 5 6 18 5 MEAN QNH PRESSURE IN HPA 1021.5 1017.5 1014.8 1012.7 1010.0 1006.4 1005.9 1008.8 1012.8 1017.1 1019.3 1021.4 1014.0 MAX. QNH PRESSURE IN HPA 1026.6 1028.2 1024.3 1021.5 1015.0 1013.7 1011.8 1014.1 1020.4 1024.5 1025.3 1025.8 1028.2 DAY 29 9 1 1 5 12 29 11 21 10 20 22 MIN. QNH PRESSURE IN HPA 1016.8 1003.9 1004.2 1006.2 1002.2 999.6 999.1 1004.2 1006.1 1011.7 1005.0 1015.0 999.1 DAY 19 21 25 12 29 17 10 23 5 6 18 5 MEAN QFF PRESSURE IN HPA 1024.2 1018.8 1013.1 1008.3 1004.2 998.8 997.7 1000.9 1006.6 1013.5 1018.8 1022.4 1010.6 MAX. QFF PRESSURE IN HPA 1033.1 1030.5 1024.8 1017.3 1010.7 1010.0 1003.6 1006.9 1016.8 1022.0 1028.5 1028.4 1033.1 DAY 29 9 11 1 5 12 29 13 21 27 20 22 MIN. QFF PRESSURE IN HPA 1018.6 1004.0 1000.6 1001.8 995.0 991.3 989.8 995.8 998.4 1007.6 1003.3 1016.3 989.8 DAY 4 21 24 12 29 17 10 23 5 6 18 5 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 920.0 916.6 914.1 912.5 909.8 906.7 906.4 908.9 912.5 916.3 917.9 919.8 913.4 MAX. QFE PRESSURE IN HPA 924.4 925.5 922.8 920.4 913.8 913.7 911.0 914.2 919.6 923.0 923.5 924.1 925.5 DAY 29 9 1 1 5 1 28 11 22 10 19 17 MIN. QFE PRESSURE IN HPA 915.9 905.4 903.7 908.0 902.6 900.7 899.8 903.5 906.5 911.8 906.7 914.4 899.8 DAY 3 21 24 12 29 17 10 23 5 6 18 4 MEAN QNH PRESSURE IN HPA 1021.4 1017.8 1015.0 1013.2 1010.4 1007.0 1006.7 1009.4 1013.3 1017.4 1019.1 1021.3 1014.3 MAX. QNH PRESSURE IN HPA 1026.3 1027.5 1024.5 1021.9 1014.7 1014.6 1011.7 1015.2 1021.0 1024.7 1025.3 1025.9 1027.5 DAY 29 9 1 1 5 1 28 11 22 10 19 17 MIN. QNH PRESSURE IN HPA 1017.0 1005.6 1003.7 1008.4 1002.5 1000.5 999.5 1003.5 1006.8 1012.5 1007.0 1015.4 999.5 DAY 3 21 24 12 29 17 10 23 5 6 18 4 MEAN QFF PRESSURE IN HPA 1023.5 1018.4 1012.9 1008.6 1004.4 999.5 998.5 1001.4 1007.0 1013.3 1018.0 1021.7 1010.6 MAX. QFF PRESSURE IN HPA 1031.5 1028.7 1024.7 1017.3 1010.0 1009.4 1004.0 1007.8 1016.5 1021.6 1027.8 1027.5 1031.5 DAY 29 9 11 1 5 12 29 14 21 27 20 22 MIN. QFF PRESSURE IN HPA 1018.0 1005.1 999.6 1002.9 995.6 992.1 990.1 995.5 999.6 1008.2 1004.6 1015.8 990.1 DAY 3 21 24 25 29 17 10 23 5 6 17 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 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.4 9.2 13.4 16.9 23.6 29.2 32.1 31.7 27.2 21.1 11.3 4.0 18.7 MINIMUN AIR TEMPERATURE (C) -0.6 2.1 5.0 10.5 14.5 19.7 23.2 22.0 16.7 11.8 5.2 -0.3 10.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 10 26 24 1 0 0 0 61 DAYS WITH MINIMUM TEMP. <=-4 9 0 1 0 0 0 0 0 0 0 0 8 18 DAYS WITH FREEZING MIN.<= 0 21 8 8 0 0 0 0 0 0 0 4 17 58 TEMPERATURE RECORDS LOWEST(C) -6.0 -2.5 -4.0 3.5 8.2 16.0 19.6 19.0 12.0 6.2 -1.6 -7.0 -7.0 DAY 14 4 7 1 5 3 6 16 30 27 30 31 MAXIMUM AIR TEMPERATURE (C) 11.1 17.4 22.1 23.5 32.2 37.5 39.6 40.3 37.0 30.8 18.7 9.4 26.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 20 30 31 31 30 20 0 0 162 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 19.0 24.0 29.6 29.5 39.6 42.0 43.5 44.4 39.6 36.0 26.5 13.5 44.4 DAY 1 26 27 30 29 13 16 10 3 3 11 8 DIF. BETWEEN (MAX.-MIN.) (C) 11.7 15.3 17.1 13.0 17.7 17.8 16.4 18.3 20.3 19.0 13.5 9.7 15.8 MEAN DAILY TEMP. (MDT) (C) 5.2 9.8 13.5 17.0 23.3 28.6 31.4 31.2 26.9 21.3 12.0 4.6 18.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 1.0 0.8 87.6 228.7 321.6 315.6 176.9 39.7 0.0 0.0 1172.1 HEATING DEG. DAYS(BASE 18 0C) 395.7 230.9 145.5 55.2 0.7 0.0 0.0 0.0 0.0 4.5 181.9 416.0 1430.3 DEWPOINT (MEAN C) -1.6 -3.3 -2.9 6.1 5.2 7.5 6.9 7.8 5.5 2.6 3.0 -2.0 2.9 MIXING RATIO (G/KG) 3.86 3.38 3.68 6.73 6.31 7.48 7.08 7.54 6.41 5.19 5.32 3.80 5.57 VAPOUR PRESSURE (HPA) 5.65 4.96 5.37 9.76 9.14 10.77 10.22 10.86 9.31 7.58 7.79 5.57 8.08 SATURATION DEF. (HPA) 3.22 7.48 11.28 10.51 22.20 31.94 39.69 38.48 29.42 19.53 6.54 2.90 18.60 RELATIVE HUMIDITY (MEAN %) 68 46 38 55 35 28 23 25 27 33 61 68 42 RELATIVE HUMIDITY (MAX. %) 87 68 62 79 55 42 38 40 40 51 81 85 61 RELATIVE HUMIDITY (MIN. %) 44 24 17 33 20 17 13 15 17 17 36 48 25 RELATIVE HUMIDITY (MEAN% 03UTC) 83 65 57 73 50 40 37 39 39 48 80 80 58 RELATIVE HUMIDITY (MEAN% 09UTC) 51 30 22 41 25 21 16 18 18 21 42 53 30 RELATIVE HUMIDITY (MEAN% 15UTC) 62 35 26 45 25 22 14 17 22 27 52 60 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 28.0 3.1 6.0 66.4 4.0 0.0 0.0 0.0 0.0 2.8 26.0 13.4 149.7 DAYS WITH PRECIPITATION >=10 0 0 0 3 0 0 0 0 0 0 1 0 4 DAYS WITH PRECIPITATION >= 5 3 0 0 4 0 0 0 0 0 0 1 1 9 DAYS WITH PRECIPITATION >= 1 6 1 2 8 1 0 0 0 0 1 4 3 26 DAYS WITH PRECIPITATION 6 6 8 10 1 0 0 0 0 2 5 9 47 GREATEST DAILY PRECIPITATION 9.0 2.5 3.8 26.0 4.0 0.0 0.0 0.0 0.0 2.0 18.0 5.0 26.0 DAY 11 19 28 12 4 ** ** ** ** 31 16 19 DAY WITH THUNDER STORM 0 0 0 1 0 0 0 0 0 0 0 0 1 DAYS WITH SNOW OR SLEET 2 1 0 0 0 0 0 0 0 0 0 2 5 DAYS WITH DUST 2 1 4 4 1 0 2 0 0 0 3 0 17 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.2 8.3 9.5 8.6 10.0 9.6 10.2 8.3 8.5 7.0 6.9 9.5 8.6 PREVAILING WIND PERCENT 12.9 25.9 16.1 22.5 18.1 20.4 37.5 28.2 11.7 10.5 15.8 12.5 14.1 CALMS PERCENT OF WIND 73.8 50.9 63.7 51.7 50.8 37.9 40.3 51.2 69.2 67.3 71.7 69.8 58.3 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 292 284 283 281 287 299 92 88 80 285 285 287 297 VECTOR WIND MAGNITUDE(KNOTS) 1.6 3.5 2.5 2.9 2.7 1.4 4.7 2.5 0.5 0.8 1.4 1.4 0.9 WIND STEADINESES (MEAN %) 76.2 83.3 71.4 65.9 58.7 23.7 83.9 65.8 20.8 34.8 70.0 53.8 25.0 WIND SPEED (MEAN KNOTS) 2.1 4.2 3.5 4.4 4.6 5.9 5.6 3.8 2.4 2.3 2.0 2.6 3.6 FASTEST WIND DIRECTION 310 250 310 240 270 300 90 90 90 220 290 280 240 FASTEST WIND SPEED (KNOTS) 25 23 29 39 27 27 29 19 16 17 31 23 39 DAY 31 27 10 25 12 22 4 2 6 31 12 22 DAYS WITH SKY CLEAR (0-2)/8 15 17 15 6 21 27 28 30 29 24 16 9 237 DAYS WITH P.CLOUDY (3-6)/8 12 10 14 19 8 3 3 1 1 6 8 15 100 DAYS WITH CLOUDY (7-8)/8 4 1 2 5 2 0 0 0 0 1 6 7 28 DAYS WITH VISIBILITY =< 2 KM 4 2 1 3 0 0 0 0 0 0 2 6 18 DURATION OF SUNSHINE HOURS 190.4 232.6 256.6 198.7 322.1 368.9 364.8 356.4 319.8 273.2 192.5 131.5 3207.5 ======================================================================================================================= 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 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 918.8 917.3 914.6 911.6 910.7 908.2 908.1 906.9 912.7 916.2 919.8 918.6 913.6 MAX. QFE PRESSURE IN HPA 927.3 927.4 929.8 921.0 918.0 917.4 915.1 914.5 919.5 922.2 929.6 929.2 929.8 DAY-HOUR 26- 6 6- 6 11- 6 1- 6 17- 6 25- 6 29- 6 31- 6 30- 6 10- 6 18- 6 3- 6 MIN. QFE PRESSURE IN HPA 909.0 906.2 905.2 901.2 904.9 898.8 899.5 900.0 906.6 909.7 911.0 905.5 898.8 DAY-HOUR 8- 0 25-12 22-12 3-12 29-12 20-15 24-15 7-15 10-15 21-12 12- 9 21-12 MEAN QNH PRESSURE IN HPA 1020.1 1018.5 1015.6 1012.3 1011.3 1008.6 1008.5 1007.2 1013.5 1017.3 1021.3 1019.9 1014.5 MAX. QNH PRESSURE IN HPA 1029.4 1029.5 1032.1 1022.6 1019.3 1018.6 1016.1 1015.5 1020.9 1023.9 1031.9 1031.5 1032.1 DAY-HOUR 26- 6 6- 6 11- 6 1- 6 17- 6 25- 6 29- 6 31- 6 30- 6 10- 6 18- 6 3- 6 MIN. QNH PRESSURE IN HPA 1009.5 1006.4 1005.4 1001.0 1005.0 998.4 999.1 999.7 1006.9 1010.2 1011.7 1005.7 998.4 DAY-HOUR 8- 0 25-12 22-12 3-12 29-12 20-15 24-15 7-15 10-15 21-12 12- 9 21-12 MEAN QFF PRESSURE IN HPA 1022.1 1018.6 1014.1 1009.3 1006.0 1001.4 1000.4 999.2 1007.0 1013.0 1020.5 1022.0 1011.1 MAX. QFF PRESSURE IN HPA 1033.0 1031.7 1033.2 1021.4 1015.0 1011.9 1008.7 1008.4 1015.4 1019.1 1032.6 1033.0 1033.2 DAY-HOUR 26- 6 19- 6 11- 3 1- 3 14- 6 25- 6 30- 3 31- 6 30- 6 11- 6 18- 6 5- 6 MIN. QFF PRESSURE IN HPA 1009.2 1004.1 1001.3 999.2 998.1 990.9 990.5 991.6 1001.0 1005.6 1008.0 1006.8 990.5 DAY-HOUR 8- 0 25-12 28- 9 3-12 29-12 20-15 24-15 8-12 10-15 21-12 12- 9 21-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 918.7 917.3 914.7 911.7 910.9 908.4 908.2 907.0 912.7 916.2 919.7 918.6 913.7 MAX. QFE PRESSURE IN HPA 926.0 925.9 927.3 919.4 915.0 915.0 913.8 911.9 917.1 920.1 927.6 927.0 927.6 DAY 26 6 11 1 17 25 30 30 23 11 18 4 MIN. QFE PRESSURE IN HPA 909.0 909.1 907.2 904.2 906.0 902.0 903.1 901.8 907.9 911.7 911.7 908.1 901.8 DAY 8 27 27 4 20 20 25 18 11 22 12 22 MEAN QNH PRESSURE IN HPA 1020.1 1018.5 1015.6 1012.5 1011.5 1008.9 1008.6 1007.3 1013.5 1017.4 1021.1 1019.9 1014.6 MAX. QNH PRESSURE IN HPA 1028.0 1027.9 1029.4 1020.8 1016.0 1016.0 1014.7 1012.6 1018.3 1021.6 1029.7 1029.1 1029.7 DAY 26 6 11 1 17 25 30 30 23 11 18 4 MIN. QNH PRESSURE IN HPA 1009.5 1009.6 1007.5 1004.3 1006.2 1001.9 1003.1 1001.6 1008.3 1012.4 1012.4 1008.5 1001.6 DAY 8 27 27 4 20 20 25 18 11 22 12 22 MEAN QFF PRESSURE IN HPA 1021.5 1018.4 1013.9 1009.4 1006.3 1001.8 1000.4 999.1 1006.8 1012.7 1019.9 1021.7 1011.0 MAX. QFF PRESSURE IN HPA 1030.5 1028.3 1029.5 1019.8 1011.5 1009.2 1007.0 1005.2 1013.0 1016.5 1029.9 1031.8 1031.8 DAY 26 6 11 1 14 25 30 30 30 11 18 5 MIN. QFF PRESSURE IN HPA 1009.2 1006.5 1002.7 1003.3 999.6 993.8 994.3 993.3 1002.3 1007.1 1008.6 1009.7 993.3 DAY 8 27 28 4 20 20 25 8 11 22 12 22 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.9 917.7 915.5 912.2 912.0 910.0 909.6 908.4 913.9 917.1 920.1 918.7 914.5 MAX. QFE PRESSURE IN HPA 926.0 926.8 929.3 920.4 916.3 916.2 915.1 913.3 918.1 921.3 928.1 927.3 929.3 DAY 26 6 11 1 14 25 30 31 23 11 18 3 MIN. QFE PRESSURE IN HPA 909.0 909.6 907.4 904.6 907.0 903.3 905.0 902.7 909.2 913.0 911.7 909.2 902.7 DAY 8 27 27 4 20 20 24 17 11 22 12 21 MEAN QNH PRESSURE IN HPA 1020.2 1019.0 1016.5 1013.0 1012.7 1010.5 1010.2 1008.9 1014.8 1018.3 1021.5 1020.0 1015.5 MAX. QNH PRESSURE IN HPA 1028.0 1028.9 1031.6 1021.9 1017.4 1017.3 1016.1 1014.2 1019.4 1022.9 1030.3 1029.4 1031.6 DAY 26 6 11 1 14 25 30 31 23 11 18 3 MIN. QNH PRESSURE IN HPA 1009.5 1010.1 1007.7 1004.7 1007.3 1003.3 1005.1 1002.6 1009.7 1013.8 1012.4 1009.7 1002.6 DAY 8 27 27 4 20 20 24 17 11 22 12 21 MEAN QFF PRESSURE IN HPA 1022.5 1019.7 1015.6 1010.4 1007.7 1003.5 1002.3 1001.2 1008.9 1014.7 1021.2 1022.4 1012.5 MAX. QFF PRESSURE IN HPA 1032.0 1030.7 1033.2 1021.4 1014.2 1010.6 1008.7 1007.4 1015.0 1019.1 1031.3 1032.2 1033.2 DAY 26 6 11 1 14 25 30 31 30 11 18 5 MIN. QFF PRESSURE IN HPA 1010.2 1007.5 1003.4 1004.1 1001.2 995.4 996.8 994.9 1004.4 1009.5 1009.9 1011.8 994.9 DAY 8 27 27 4 20 20 25 18 11 22 12 21 ======================================================================================================================= 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 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 920.1 918.9 916.5 912.9 912.6 910.3 910.2 909.2 914.8 918.1 921.3 919.8 915.4 MAX. QFE PRESSURE IN HPA 927.3 927.4 929.8 921.0 918.0 917.4 915.1 914.5 919.5 922.2 929.6 929.2 929.8 DAY 26 6 11 1 17 25 29 31 30 10 18 3 MIN. QFE PRESSURE IN HPA 911.4 910.1 908.0 905.0 907.6 903.3 904.6 903.6 910.8 914.7 911.9 910.1 903.3 DAY 8 25 28 4 20 20 24 17 10 30 12 21 MEAN QNH PRESSURE IN HPA 1021.5 1020.3 1017.7 1013.8 1013.4 1011.0 1010.8 1009.7 1015.8 1019.4 1022.8 1021.3 1016.4 MAX. QNH PRESSURE IN HPA 1029.4 1029.5 1032.1 1022.6 1019.3 1018.6 1016.1 1015.5 1020.9 1023.9 1031.9 1031.5 1032.1 DAY 26 6 11 1 17 25 29 31 30 10 18 3 MIN. QNH PRESSURE IN HPA 1012.1 1010.7 1008.4 1005.1 1008.0 1003.3 1004.7 1003.6 1011.5 1015.7 1012.6 1010.7 1003.3 DAY 8 25 28 4 20 20 24 17 10 30 12 21 MEAN QFF PRESSURE IN HPA 1023.9 1020.7 1016.2 1010.8 1008.1 1003.6 1002.6 1001.6 1009.3 1015.2 1022.3 1023.6 1013.2 MAX. QFF PRESSURE IN HPA 1033.0 1031.7 1032.9 1021.1 1015.0 1011.9 1008.4 1008.4 1015.4 1019.1 1032.6 1033.0 1033.0 DAY 26 19 11 1 14 25 29 31 30 11 18 5 MIN. QFF PRESSURE IN HPA 1012.5 1008.8 1003.7 1004.7 1001.1 994.8 996.0 995.2 1005.4 1010.7 1009.7 1012.6 994.8 DAY 8 25 28 4 20 20 24 17 9 22 12 21 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.9 917.6 914.9 911.8 911.1 908.8 908.8 907.8 913.4 916.6 920.0 918.8 914.0 MAX. QFE PRESSURE IN HPA 926.0 925.1 927.7 920.0 916.5 916.1 913.6 913.5 918.0 921.1 928.3 928.5 928.5 DAY 26 6 11 1 17 25 30 31 30 10 18 3 MIN. QFE PRESSURE IN HPA 910.3 908.3 905.7 904.3 906.3 902.0 902.8 902.7 909.3 912.3 911.0 908.1 902.0 DAY 8 25 28 3 20 20 24 17 10 21 12 21 MEAN QNH PRESSURE IN HPA 1020.2 1018.9 1016.0 1012.6 1011.7 1009.2 1009.3 1008.2 1014.3 1017.7 1021.5 1020.1 1015.0 MAX. QNH PRESSURE IN HPA 1028.0 1027.0 1029.8 1021.5 1017.7 1017.2 1014.5 1014.4 1019.3 1022.7 1030.5 1030.7 1030.7 DAY 26 6 11 1 17 25 30 31 30 10 18 3 MIN. QNH PRESSURE IN HPA 1010.9 1008.7 1005.9 1004.4 1006.6 1001.9 1002.7 1002.6 1009.8 1013.1 1011.7 1008.5 1001.9 DAY 8 25 28 3 20 20 24 17 10 21 12 21 MEAN QFF PRESSURE IN HPA 1021.8 1018.6 1014.1 1009.4 1006.4 1002.0 1001.0 999.9 1007.6 1012.9 1020.3 1021.9 1011.3 MAX. QFF PRESSURE IN HPA 1030.9 1030.3 1030.3 1019.7 1012.8 1010.3 1006.7 1007.2 1014.2 1017.5 1030.5 1031.8 1031.8 DAY 14 19 11 1 17 25 30 31 30 10 18 4 MIN. QFF PRESSURE IN HPA 1010.4 1006.3 1001.3 1002.8 999.3 994.1 993.7 994.4 1003.5 1008.4 1008.0 1010.1 993.7 DAY 8 25 28 3 29 20 24 17 10 21 12 21 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 917.8 915.8 913.0 910.3 909.2 906.7 906.7 905.6 911.3 914.7 918.7 917.6 912.3 MAX. QFE PRESSURE IN HPA 924.2 922.8 924.9 918.0 914.7 913.3 911.4 911.0 916.1 919.3 927.0 927.6 927.6 DAY 26 19 11 1 17 25 29 31 29 10 18 3 MIN. QFE PRESSURE IN HPA 910.0 906.2 905.2 901.2 904.9 899.9 900.6 900.8 907.0 909.7 911.2 905.5 899.9 DAY 8 25 22 3 29 19 24 17 10 21 12 21 MEAN QNH PRESSURE IN HPA 1019.1 1016.9 1013.9 1010.9 1009.7 1007.0 1007.0 1005.8 1012.0 1015.7 1020.0 1018.9 1013.1 MAX. QNH PRESSURE IN HPA 1026.0 1024.5 1026.8 1019.3 1015.7 1014.2 1012.1 1011.7 1017.2 1020.7 1029.1 1029.7 1029.7 DAY 26 19 11 1 17 25 29 31 29 10 18 3 MIN. QNH PRESSURE IN HPA 1010.6 1006.4 1005.4 1001.0 1005.0 999.6 1000.3 1000.6 1007.3 1010.2 1011.9 1005.7 999.6 DAY 8 25 22 3 29 19 24 17 10 21 12 21 MEAN QFF PRESSURE IN HPA 1020.6 1016.6 1012.1 1007.8 1004.4 999.8 998.8 997.5 1005.2 1011.1 1018.9 1020.6 1009.5 MAX. QFF PRESSURE IN HPA 1029.3 1027.5 1027.5 1017.4 1010.7 1007.4 1004.7 1004.4 1012.0 1015.8 1029.1 1030.4 1030.4 DAY 14 19 11 1 17 25 29 31 30 10 18 3 MIN. QFF PRESSURE IN HPA 1010.5 1004.1 1002.2 999.2 998.1 991.7 991.5 991.6 1001.0 1005.6 1009.2 1006.8 991.5 DAY 8 25 27 3 29 19 24 8 10 21 12 21 ======================================================================================================================= 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 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 918.3 916.2 913.1 910.4 908.8 906.1 906.0 904.9 910.9 915.0 919.1 918.0 912.2 MAX. QFE PRESSURE IN HPA 924.6 923.9 924.1 917.3 913.5 912.5 911.0 910.7 915.8 919.6 927.2 927.2 927.2 DAY 27 5 11 1 17 25 29 31 29 10 18 3 MIN. QFE PRESSURE IN HPA 911.0 907.4 905.2 902.5 904.9 898.8 899.5 900.0 906.6 910.0 912.2 905.7 898.8 DAY 7 26 22 3 29 20 24 7 10 21 13 21 MEAN QNH PRESSURE IN HPA 1019.6 1017.3 1014.0 1011.0 1009.3 1006.4 1006.3 1005.1 1011.6 1016.1 1020.5 1019.3 1013.0 MAX. QNH PRESSURE IN HPA 1026.5 1025.7 1025.9 1018.5 1014.4 1013.3 1011.7 1011.3 1016.9 1021.0 1029.3 1029.3 1029.3 DAY 27 5 11 1 17 25 29 31 29 10 18 3 MIN. QNH PRESSURE IN HPA 1011.7 1007.7 1005.4 1002.4 1005.0 998.4 999.1 999.7 1006.9 1010.6 1013.0 1005.9 998.4 DAY 7 26 22 3 29 20 24 7 10 21 13 21 MEAN QFF PRESSURE IN HPA 1021.9 1017.9 1013.0 1008.3 1004.2 999.2 998.4 997.3 1005.5 1012.5 1020.2 1021.7 1010.0 MAX. QFF PRESSURE IN HPA 1031.0 1027.8 1027.5 1017.1 1009.6 1006.4 1004.4 1004.5 1012.4 1018.3 1030.1 1031.1 1031.1 DAY 14 5 11 1 2 25 29 31 30 31 18 14 MIN. QFF PRESSURE IN HPA 1012.1 1005.8 1002.4 1001.0 998.5 990.9 990.5 991.8 1001.0 1006.7 1010.7 1007.5 990.5 DAY 7 26 27 3 29 20 24 7 10 21 13 21 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 918.9 917.3 914.3 911.6 910.4 907.5 907.3 905.9 912.1 915.9 919.9 918.6 913.3 MAX. QFE PRESSURE IN HPA 925.6 925.1 925.7 918.0 914.3 914.0 912.0 911.7 917.2 920.1 927.7 927.3 927.7 DAY 25 5 10 1 17 24 29 31 21 10 18 4 MIN. QFE PRESSURE IN HPA 910.5 907.8 906.1 904.2 905.6 900.0 901.2 900.8 907.5 910.5 913.3 905.5 900.0 DAY 7 26 27 3 19 20 24 17 10 21 11 21 MEAN QNH PRESSURE IN HPA 1020.3 1018.6 1015.3 1012.4 1011.0 1007.9 1007.7 1006.1 1012.9 1017.0 1021.3 1020.0 1014.2 MAX. QNH PRESSURE IN HPA 1027.6 1027.0 1027.7 1019.3 1015.3 1014.9 1012.8 1012.4 1018.4 1021.6 1029.8 1029.4 1029.8 DAY 25 5 10 1 17 24 29 31 21 10 18 4 MIN. QNH PRESSURE IN HPA 1011.1 1008.2 1006.3 1004.3 1005.8 999.7 1001.0 1000.6 1007.9 1011.1 1014.2 1005.7 999.7 DAY 7 26 27 3 19 20 24 17 10 21 11 21 MEAN QFF PRESSURE IN HPA 1022.6 1018.9 1013.8 1009.3 1005.6 1000.5 999.4 998.1 1006.4 1012.9 1020.9 1022.3 1010.9 MAX. QFF PRESSURE IN HPA 1031.3 1028.5 1027.6 1016.5 1010.3 1008.2 1005.3 1005.6 1013.1 1017.2 1030.7 1031.9 1031.9 DAY 14 5 10 1 17 24 30 31 30 10 18 4 MIN. QFF PRESSURE IN HPA 1011.0 1006.1 1001.9 1002.8 999.2 991.5 992.1 992.1 1001.9 1006.1 1011.3 1007.4 991.5 DAY 7 26 27 25 29 19 24 17 10 21 11 21 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 918.8 917.5 914.8 911.7 910.7 908.1 908.0 906.6 912.6 916.2 920.0 918.6 913.6 MAX. QFE PRESSURE IN HPA 926.0 926.0 927.7 918.7 914.8 915.0 912.8 912.1 917.5 920.3 927.7 927.3 927.7 DAY 25 5 10 1 16 24 29 31 21 10 18 4 MIN. QFE PRESSURE IN HPA 910.0 908.7 907.2 904.2 905.6 901.0 901.7 901.3 907.9 911.0 912.4 907.2 901.0 DAY 7 26 26 3 19 19 24 17 10 21 11 21 MEAN QNH PRESSURE IN HPA 1020.2 1018.8 1015.8 1012.4 1011.3 1008.5 1008.4 1006.9 1013.4 1017.3 1021.4 1019.9 1014.5 MAX. QNH PRESSURE IN HPA 1028.0 1028.0 1029.8 1020.1 1015.8 1016.0 1013.6 1012.9 1018.7 1021.8 1029.8 1029.4 1029.8 DAY 25 5 10 1 16 24 29 31 21 10 18 4 MIN. QNH PRESSURE IN HPA 1010.6 1009.2 1007.5 1004.3 1005.8 1000.8 1001.5 1001.1 1008.3 1011.7 1013.2 1007.5 1000.8 DAY 7 26 26 3 19 19 24 17 10 21 11 21 MEAN QFF PRESSURE IN HPA 1021.8 1018.5 1013.9 1009.2 1005.9 1001.2 1000.0 998.7 1006.8 1012.5 1020.3 1021.7 1010.9 MAX. QFF PRESSURE IN HPA 1030.8 1028.1 1029.4 1016.5 1011.0 1009.1 1005.6 1006.1 1013.0 1016.9 1029.9 1032.1 1032.1 DAY 25 5 10 1 13 24 29 31 30 10 18 4 MIN. QFF PRESSURE IN HPA 1009.8 1006.5 1003.3 1003.1 998.9 992.4 992.6 992.5 1002.3 1006.0 1009.3 1008.9 992.4 DAY 7 26 26 3 19 19 24 7 10 21 11 21 ======================================================================================================================= 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 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.6 6.8 10.6 17.8 22.5 28.9 34.2 31.1 25.0 21.2 10.1 5.5 18.3 MINIMUN AIR TEMPERATURE (C) 0.2 1.1 4.1 11.3 14.4 19.7 25.5 21.6 15.0 12.1 3.2 1.1 10.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 12 31 19 1 0 0 0 63 DAYS WITH MINIMUM TEMP. <=-4 2 1 3 0 0 0 0 0 0 0 3 5 14 DAYS WITH FREEZING MIN.<= 0 15 9 5 0 0 0 0 0 0 0 9 14 52 TEMPERATURE RECORDS LOWEST(C) -5.0 -5.0 -5.5 4.0 7.8 13.0 21.5 18.0 8.8 8.5 -4.6 -6.0 -6.0 DAY 3 18 3 18 10 7 2 31 28 17 23 23 MAXIMUM AIR TEMPERATURE (C) 12.5 13.5 17.0 25.0 30.0 37.0 41.8 39.2 34.2 30.3 17.8 10.7 25.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 7 19 30 31 31 26 20 0 0 164 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 21.5 17.0 23.2 33.8 35.5 42.0 46.0 42.0 38.5 34.0 25.0 17.0 46.0 DAY 9 9 20 6 16 23 17 15 6 10 1 9 DIF. BETWEEN (MAX.-MIN.) (C) 12.3 12.4 12.9 13.7 15.6 17.3 16.3 17.6 19.2 18.2 14.6 9.6 14.9 MEAN DAILY TEMP. (MDT) (C) 6.4 7.3 10.5 18.2 22.2 28.4 33.6 30.4 24.6 21.2 10.5 5.9 18.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 16.1 60.1 221.1 392.1 290.8 113.1 24.3 0.0 0.0 1117.7 HEATING DEG. DAYS(BASE 18 0C) 360.7 299.2 231.3 46.8 2.1 0.0 0.0 0.0 0.0 1.3 227.0 374.9 1543.3 DEWPOINT (MEAN C) -1.8 -1.8 -0.4 5.5 3.2 6.0 7.4 5.3 2.5 1.6 -2.5 0.1 2.1 MIXING RATIO (G/KG) 3.74 3.78 4.35 6.40 5.69 6.61 7.37 6.33 5.22 4.86 3.65 4.42 5.20 VAPOUR PRESSURE (HPA) 5.48 5.52 6.34 9.29 8.27 9.55 10.58 9.15 7.59 7.09 5.36 6.48 7.56 SATURATION DEF. (HPA) 4.12 4.75 7.07 12.38 20.44 32.64 45.36 38.17 26.48 19.74 7.97 2.91 18.50 RELATIVE HUMIDITY (MEAN %) 64 59 52 50 32 26 21 22 26 31 45 71 42 RELATIVE HUMIDITY (MAX. %) 80 81 75 74 51 44 37 38 43 48 65 88 60 RELATIVE HUMIDITY (MIN. %) 42 34 27 29 18 14 12 12 14 16 25 51 25 RELATIVE HUMIDITY (MEAN% 03UTC) 77 77 72 70 48 43 36 38 42 45 61 84 58 RELATIVE HUMIDITY (MEAN% 09UTC) 49 40 35 37 21 18 15 16 17 19 30 58 30 RELATIVE HUMIDITY (MEAN% 15UTC) 57 49 39 37 23 15 12 12 17 22 38 64 32 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 29.8 15.6 35.2 35.6 15.2 0.0 0.0 0.0 0.0 1.0 6.2 26.8 165.4 DAYS WITH PRECIPITATION >=10 1 0 1 1 1 0 0 0 0 0 0 1 5 DAYS WITH PRECIPITATION >= 5 3 2 3 3 1 0 0 0 0 0 1 2 15 DAYS WITH PRECIPITATION >= 1 5 4 7 7 1 0 0 0 0 1 1 4 30 DAYS WITH PRECIPITATION 5 7 12 10 6 0 0 0 0 2 3 7 52 GREATEST DAILY PRECIPITATION 10.0 5.0 11.0 12.0 14.0 0.0 0.0 0.0 0.0 1.0 5.0 13.0 14.0 DAY 19 5 26 16 29 ** ** ** ** 30 29 2 DAY WITH THUNDER STORM 0 0 0 0 2 0 0 0 0 1 0 0 3 DAYS WITH SNOW OR SLEET 3 1 0 0 0 0 0 0 0 0 0 1 5 DAYS WITH DUST 0 1 1 2 1 2 1 1 1 0 1 3 14 WIND DIRECTION (PREVAILING) 270 270 270 270 315 270 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.1 8.3 10.9 7.8 11.7 9.4 9.4 9.6 8.2 8.2 8.7 8.5 8.7 PREVAILING WIND PERCENT 28.2 27.7 23.4 20.4 14.1 16.3 30.2 33.9 20.8 22.2 18.8 12.1 17.3 CALMS PERCENT OF WIND 59.3 43.8 49.2 45.0 38.3 46.3 36.3 48.8 57.5 54.0 61.3 71.0 50.9 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 277 289 281 280 313 352 85 89 90 266 289 296 298 VECTOR WIND MAGNITUDE(KNOTS) 2.6 3.2 3.0 2.4 1.2 0.7 2.2 3.9 1.1 2.1 2.1 1.0 0.9 WIND STEADINESES (MEAN %) 81.2 68.1 62.5 51.1 21.1 14.6 39.3 84.8 33.3 55.3 61.8 41.7 21.4 WIND SPEED (MEAN KNOTS) 3.2 4.7 4.8 4.7 5.7 4.8 5.6 4.6 3.3 3.8 3.4 2.4 4.2 FASTEST WIND DIRECTION 260 280 280 270 300 270 100 90 90 240 300 300 270 FASTEST WIND SPEED (KNOTS) 27 19 29 39 29 27 19 19 17 27 23 19 39 DAY 7 5 8 11 23 4 5 3 15 18 11 11 DAYS WITH SKY CLEAR (0-2)/8 15 10 13 5 15 25 29 31 30 21 17 11 222 DAYS WITH P.CLOUDY (3-6)/8 9 13 14 15 13 5 2 0 0 8 11 11 101 DAYS WITH CLOUDY (7-8)/8 7 5 4 10 3 0 0 0 0 2 2 9 42 DAYS WITH VISIBILITY =< 2 KM 2 2 1 0 0 0 0 0 0 1 0 1 7 DURATION OF SUNSHINE HOURS 187.3 172.8 212.5 183.1 299.0 338.0 345.5 361.3 321.6 251.6 215.2 151.7 3039.6 ======================================================================================================================= 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 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 918.1 914.2 914.4 914.0 914.1 907.8 904.1 909.5 912.5 915.8 919.9 921.4 913.8 MAX. QFE PRESSURE IN HPA 924.3 922.3 927.3 920.5 923.7 915.0 912.6 915.2 922.5 922.4 931.0 932.4 932.4 DAY-HOUR 12- 6 12- 6 2- 6 3- 6 2- 6 7- 6 4- 6 30- 6 27- 6 15- 6 25- 6 12- 6 MIN. QFE PRESSURE IN HPA 904.6 903.7 901.6 906.0 907.2 899.3 898.9 904.1 905.0 908.3 911.2 911.2 898.9 DAY-HOUR 28-15 20-12 26-12 27-15 23-12 30-15 24-15 1- 0 7-15 27-12 14-12 6-12 MEAN QNH PRESSURE IN HPA 1019.4 1015.1 1015.4 1014.9 1015.0 1008.2 1004.1 1010.0 1013.3 1016.8 1021.4 1023.0 1014.7 MAX. QNH PRESSURE IN HPA 1026.1 1024.0 1029.4 1022.0 1025.5 1016.0 1013.4 1016.2 1024.2 1024.1 1033.4 1035.0 1035.0 DAY-HOUR 12- 6 12- 6 2- 6 3- 6 2- 6 7- 6 4- 6 30- 6 27- 6 15- 6 25- 6 12- 6 MIN. QNH PRESSURE IN HPA 1004.7 1003.7 1001.4 1006.2 1007.5 998.9 998.5 1004.2 1005.1 1008.7 1011.9 1011.9 998.5 DAY-HOUR 28-15 20-12 26-12 27-15 23-12 30-15 24-15 1- 0 7-15 27-12 14-12 6-12 MEAN QFF PRESSURE IN HPA 1020.9 1016.1 1014.9 1011.7 1010.2 1001.1 995.3 1002.3 1007.7 1012.5 1021.2 1024.5 1011.5 MAX. QFF PRESSURE IN HPA 1028.4 1025.2 1032.5 1019.6 1023.2 1011.2 1005.3 1008.8 1019.9 1020.9 1036.4 1038.4 1038.4 DAY-HOUR 23- 6 12- 6 2- 6 3- 6 2- 6 7- 6 4- 3 30- 6 27- 6 15- 6 25- 6 12- 6 MIN. QFF PRESSURE IN HPA 1006.7 1005.9 999.2 1002.1 1001.7 991.2 989.5 995.4 998.6 1003.2 1009.7 1011.7 989.5 DAY-HOUR 28-15 20-12 26-12 27-15 23-12 30-15 24-15 1- 0 7-12 27-12 14-12 6-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 918.1 914.2 914.4 913.9 914.2 908.0 904.0 909.5 912.6 915.8 919.8 921.3 913.8 MAX. QFE PRESSURE IN HPA 923.0 920.6 925.0 919.8 920.9 913.2 909.3 912.9 920.1 920.5 929.2 931.1 931.1 DAY 12 13 3 8 2 7 3 4 27 16 26 12 MIN. QFE PRESSURE IN HPA 906.4 906.4 905.4 907.9 907.7 900.7 900.4 904.1 906.4 910.8 913.0 912.8 900.4 DAY 29 19 13 28 8 30 31 1 7 27 14 7 MEAN QNH PRESSURE IN HPA 1019.3 1015.1 1015.4 1014.8 1015.2 1008.4 1004.0 1010.0 1013.4 1016.8 1021.3 1022.9 1014.7 MAX. QNH PRESSURE IN HPA 1024.7 1022.1 1026.9 1021.2 1022.4 1014.1 1009.8 1013.7 1021.6 1022.0 1031.5 1033.5 1033.5 DAY 12 13 3 8 2 7 3 4 27 16 26 12 MIN. QNH PRESSURE IN HPA 1006.7 1006.7 1005.6 1008.3 1008.1 1000.5 1000.1 1004.2 1006.7 1011.5 1013.8 1013.6 1000.1 DAY 29 19 13 28 8 30 31 1 7 27 14 7 MEAN QFF PRESSURE IN HPA 1020.4 1015.6 1014.7 1011.4 1010.3 1001.3 995.1 1002.0 1007.5 1012.2 1020.7 1024.1 1011.3 MAX. QFF PRESSURE IN HPA 1027.2 1023.5 1029.6 1017.1 1019.3 1009.3 1001.7 1006.0 1017.4 1017.6 1033.2 1035.5 1035.5 DAY 23 13 3 19 2 7 3 31 27 15 26 12 MIN. QFF PRESSURE IN HPA 1008.8 1008.3 1004.0 1003.7 1002.1 992.2 991.2 995.4 1000.0 1005.9 1011.0 1013.7 991.2 DAY 29 19 21 28 8 30 31 1 7 27 14 7 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.1 914.6 915.0 914.5 915.1 909.5 905.5 911.1 913.8 916.6 920.3 921.3 914.6 MAX. QFE PRESSURE IN HPA 922.9 920.1 925.0 919.8 922.8 914.5 912.4 914.6 921.4 921.4 929.0 931.3 931.3 DAY 12 7 3 8 2 7 4 4 27 15 25 12 MIN. QFE PRESSURE IN HPA 908.5 905.6 905.4 909.0 908.0 902.8 901.8 905.5 907.3 910.8 913.6 912.6 901.8 DAY 29 19 13 28 8 30 1 1 7 27 14 6 MEAN QNH PRESSURE IN HPA 1019.4 1015.6 1016.0 1015.5 1016.1 1010.1 1005.7 1011.7 1014.7 1017.8 1021.8 1022.9 1015.6 MAX. QNH PRESSURE IN HPA 1024.6 1021.6 1026.9 1021.2 1024.5 1015.5 1013.2 1015.6 1023.0 1023.0 1031.3 1033.8 1033.8 DAY 12 7 3 8 2 7 4 4 27 15 25 12 MIN. QNH PRESSURE IN HPA 1008.9 1005.8 1005.6 1009.5 1008.4 1002.7 1001.6 1005.7 1007.6 1011.5 1014.5 1013.4 1001.6 DAY 29 19 13 28 8 30 1 1 7 27 14 6 MEAN QFF PRESSURE IN HPA 1021.4 1016.9 1016.0 1012.6 1011.6 1003.2 997.0 1004.3 1009.5 1014.1 1022.1 1024.8 1012.8 MAX. QFF PRESSURE IN HPA 1027.2 1023.6 1030.2 1018.4 1022.0 1010.7 1005.3 1008.5 1019.5 1019.9 1034.1 1036.9 1036.9 DAY 23 13 3 19 2 7 4 31 27 15 25 12 MIN. QFF PRESSURE IN HPA 1010.6 1007.7 1005.1 1005.4 1003.1 994.6 993.2 997.6 1001.9 1006.1 1012.5 1013.6 993.2 DAY 16 19 13 28 8 30 30 1 7 27 14 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 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 919.5 915.6 916.1 915.3 915.7 910.0 906.2 911.8 914.8 917.7 921.5 922.7 915.6 MAX. QFE PRESSURE IN HPA 924.3 922.3 927.3 920.5 923.7 915.0 912.6 915.2 922.5 922.4 931.0 932.4 932.4 DAY 12 12 2 3 2 7 4 30 27 15 25 12 MIN. QFE PRESSURE IN HPA 910.5 905.6 906.3 909.7 910.1 903.0 902.9 905.8 907.9 911.6 914.9 913.0 902.9 DAY 28 19 26 28 8 30 8 1 7 27 14 6 MEAN QNH PRESSURE IN HPA 1020.9 1016.7 1017.2 1016.4 1016.8 1010.5 1006.4 1012.5 1015.8 1018.9 1023.1 1024.4 1016.6 MAX. QNH PRESSURE IN HPA 1026.1 1024.0 1029.4 1022.0 1025.5 1016.0 1013.4 1016.2 1024.2 1024.1 1033.4 1035.0 1035.0 DAY 12 12 2 3 2 7 4 30 27 15 25 12 MIN. QNH PRESSURE IN HPA 1011.1 1005.8 1006.6 1010.2 1010.7 1003.0 1002.8 1006.0 1008.3 1012.3 1015.9 1013.8 1002.8 DAY 28 19 26 28 8 30 8 1 7 27 14 6 MEAN QFF PRESSURE IN HPA 1022.8 1017.9 1016.8 1013.3 1011.9 1003.3 997.6 1004.7 1010.0 1014.8 1023.1 1026.2 1013.5 MAX. QFF PRESSURE IN HPA 1028.4 1025.2 1032.5 1019.6 1023.2 1011.2 1005.1 1008.8 1019.9 1020.9 1036.4 1038.4 1038.4 DAY 23 12 2 3 2 7 4 30 27 15 25 12 MIN. QFF PRESSURE IN HPA 1012.7 1007.7 1004.6 1005.6 1005.0 994.7 994.0 997.8 1001.6 1007.9 1014.0 1014.1 994.0 DAY 28 19 26 28 23 30 8 1 7 27 2 6 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.3 914.6 915.0 914.5 914.4 908.7 905.1 910.4 913.4 916.2 920.1 921.6 914.4 MAX. QFE PRESSURE IN HPA 923.4 921.2 926.6 919.1 922.4 913.7 911.4 913.8 921.0 921.2 929.7 930.9 930.9 DAY 31 12 2 3 2 7 3 30 27 15 25 12 MIN. QFE PRESSURE IN HPA 907.4 905.2 902.8 909.2 909.0 902.4 901.7 905.6 906.8 910.2 913.0 911.7 901.7 DAY 28 19 26 27 23 30 30 1 7 27 14 6 MEAN QNH PRESSURE IN HPA 1019.7 1015.6 1016.0 1015.5 1015.4 1009.1 1005.3 1011.0 1014.2 1017.3 1021.6 1023.2 1015.3 MAX. QNH PRESSURE IN HPA 1025.2 1022.8 1028.6 1020.5 1024.1 1014.6 1012.1 1014.7 1022.6 1022.8 1032.0 1033.3 1033.3 DAY 31 12 2 3 2 7 3 30 27 15 25 12 MIN. QNH PRESSURE IN HPA 1007.7 1005.4 1002.7 1009.7 1009.5 1002.3 1001.5 1005.8 1007.1 1010.8 1013.8 1012.4 1001.5 DAY 28 19 26 27 23 30 30 1 7 27 14 6 MEAN QFF PRESSURE IN HPA 1020.8 1016.3 1015.3 1012.0 1010.5 1002.0 996.3 1003.2 1008.4 1012.6 1021.0 1024.4 1011.9 MAX. QFF PRESSURE IN HPA 1026.6 1023.3 1031.2 1017.6 1021.0 1009.5 1003.6 1007.0 1018.4 1018.6 1034.0 1036.3 1036.3 DAY 23 6 2 3 2 7 3 30 27 15 25 12 MIN. QFF PRESSURE IN HPA 1009.6 1007.4 1000.3 1005.4 1003.7 994.5 992.6 997.0 1000.5 1004.6 1011.4 1012.3 992.6 DAY 28 19 26 27 23 30 30 1 7 27 1 6 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 917.0 912.9 913.1 912.9 912.7 906.6 903.1 908.2 911.1 914.4 918.7 920.4 912.6 MAX. QFE PRESSURE IN HPA 922.2 919.6 925.5 918.8 920.4 911.9 909.6 911.4 918.8 919.3 928.8 928.9 928.9 DAY 22 12 2 8 2 6 3 4 27 15 25 12 MIN. QFE PRESSURE IN HPA 905.2 903.7 901.6 907.0 907.2 900.3 899.9 904.6 905.1 908.3 911.2 911.2 899.9 DAY 28 20 26 27 23 30 30 1 7 27 14 6 MEAN QNH PRESSURE IN HPA 1018.2 1013.8 1014.0 1013.8 1013.5 1006.9 1003.1 1008.6 1011.8 1015.3 1020.1 1021.9 1013.4 MAX. QNH PRESSURE IN HPA 1023.9 1021.0 1027.5 1020.2 1021.9 1012.6 1010.1 1012.1 1020.2 1020.7 1031.0 1031.2 1031.2 DAY 22 12 2 8 2 6 3 4 27 15 25 12 MIN. QNH PRESSURE IN HPA 1005.4 1003.7 1001.4 1007.3 1007.5 1000.0 999.6 1004.7 1005.2 1008.7 1011.9 1011.9 999.6 DAY 28 20 26 27 23 30 30 1 7 27 14 6 MEAN QFF PRESSURE IN HPA 1019.2 1014.3 1013.2 1010.3 1008.7 999.8 994.1 1000.7 1005.9 1010.7 1019.5 1023.1 1010.0 MAX. QFF PRESSURE IN HPA 1026.5 1022.0 1030.1 1015.6 1018.9 1007.7 1001.8 1004.3 1016.1 1016.5 1033.0 1034.0 1034.0 DAY 22 28 2 18 2 7 3 4 27 15 25 12 MIN. QFF PRESSURE IN HPA 1007.1 1005.9 999.2 1002.4 1001.7 992.1 990.5 995.9 998.6 1003.2 1009.7 1011.7 990.5 DAY 28 20 26 27 23 30 30 1 7 27 14 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 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 917.5 913.3 913.1 912.9 912.4 905.8 902.1 907.5 910.7 914.4 919.1 921.1 912.5 MAX. QFE PRESSURE IN HPA 922.8 919.9 925.0 917.4 919.9 911.2 908.4 910.5 918.3 919.3 928.8 929.9 929.9 DAY 22 12 2 8 2 4 3 30 26 15 25 11 MIN. QFE PRESSURE IN HPA 904.6 904.9 902.3 906.0 907.5 899.3 898.9 904.6 905.0 908.3 912.6 911.2 898.9 DAY 28 20 26 27 7 30 24 1 7 27 13 6 MEAN QNH PRESSURE IN HPA 1018.7 1014.1 1014.0 1013.7 1013.2 1006.0 1001.9 1007.8 1011.3 1015.4 1020.5 1022.6 1013.3 MAX. QNH PRESSURE IN HPA 1024.5 1021.4 1026.9 1018.6 1021.4 1011.9 1008.8 1011.1 1019.6 1020.7 1031.0 1032.2 1032.2 DAY 22 12 2 8 2 4 3 30 26 15 25 11 MIN. QNH PRESSURE IN HPA 1004.7 1005.0 1002.2 1006.2 1007.9 998.9 998.5 1004.7 1005.1 1008.7 1013.4 1011.9 998.5 DAY 28 20 26 27 7 30 24 1 7 27 13 6 MEAN QFF PRESSURE IN HPA 1020.6 1015.4 1013.9 1010.8 1008.7 999.1 993.4 1000.5 1006.1 1011.7 1020.9 1024.5 1010.5 MAX. QFF PRESSURE IN HPA 1027.2 1023.3 1029.9 1016.0 1018.8 1006.6 1001.0 1004.6 1016.0 1017.5 1033.7 1035.4 1035.4 DAY 22 28 2 30 2 6 3 30 27 15 25 12 MIN. QFF PRESSURE IN HPA 1006.7 1007.1 1000.8 1002.1 1003.0 991.2 989.5 996.6 999.3 1003.5 1011.1 1011.7 989.5 DAY 28 20 26 27 7 30 24 1 7 27 1 6 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 918.2 914.2 914.2 914.0 913.9 906.8 903.2 908.6 911.8 915.4 920.0 921.6 913.5 MAX. QFE PRESSURE IN HPA 922.9 921.4 925.6 919.1 920.7 912.9 908.8 911.5 919.4 920.5 929.5 930.6 930.6 DAY 11 12 2 30 2 6 3 3 26 15 25 11 MIN. QFE PRESSURE IN HPA 905.8 906.5 903.9 907.2 909.1 899.7 899.7 905.8 905.9 910.2 913.2 912.4 899.7 DAY 28 19 26 27 7 30 24 6 6 27 13 6 MEAN QNH PRESSURE IN HPA 1019.5 1015.2 1015.2 1014.9 1014.9 1007.1 1003.1 1009.1 1012.5 1016.5 1021.4 1023.2 1014.4 MAX. QNH PRESSURE IN HPA 1024.6 1023.0 1027.6 1020.5 1022.2 1013.7 1009.3 1012.2 1020.8 1022.0 1031.8 1033.0 1033.0 DAY 11 12 2 30 2 6 3 3 26 15 25 11 MIN. QNH PRESSURE IN HPA 1006.0 1006.8 1003.9 1007.5 1009.6 999.4 999.4 1006.0 1006.1 1010.8 1014.1 1013.2 999.4 DAY 28 19 26 27 7 30 24 6 6 27 13 6 MEAN QFF PRESSURE IN HPA 1021.4 1016.4 1014.7 1011.8 1009.9 999.8 994.3 1001.2 1006.7 1012.3 1021.5 1025.0 1011.3 MAX. QFF PRESSURE IN HPA 1027.7 1024.5 1030.4 1018.0 1019.8 1008.6 1000.7 1005.3 1016.0 1018.3 1034.2 1035.9 1035.9 DAY 22 12 2 30 2 6 3 30 26 15 25 12 MIN. QFF PRESSURE IN HPA 1007.9 1008.9 1003.1 1003.6 1003.8 991.5 990.1 997.5 999.4 1005.9 1011.8 1013.2 990.1 DAY 28 20 26 27 7 30 24 6 7 27 1 6 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 918.2 914.3 914.4 914.2 914.2 907.3 903.7 909.2 912.3 915.8 920.1 921.3 913.7 MAX. QFE PRESSURE IN HPA 923.2 921.3 925.6 919.6 920.9 913.2 909.2 912.4 919.5 920.6 929.5 931.1 931.1 DAY 11 28 2 30 1 6 3 30 26 15 25 11 MIN. QFE PRESSURE IN HPA 906.4 906.9 905.2 908.1 908.9 900.5 900.4 906.5 906.4 910.7 913.2 912.8 900.4 DAY 28 19 26 27 7 30 24 6 6 26 13 6 MEAN QNH PRESSURE IN HPA 1019.5 1015.3 1015.4 1015.1 1015.2 1007.7 1003.7 1009.7 1013.1 1016.9 1021.6 1022.9 1014.7 MAX. QNH PRESSURE IN HPA 1024.9 1022.9 1027.6 1021.0 1022.4 1014.1 1009.7 1013.2 1020.9 1022.1 1031.8 1033.5 1033.5 DAY 11 28 2 30 1 6 3 30 26 15 25 11 MIN. QNH PRESSURE IN HPA 1006.7 1007.2 1005.4 1008.5 1009.4 1000.2 1000.1 1006.8 1006.7 1011.3 1014.1 1013.6 1000.1 DAY 28 19 26 27 7 30 24 6 6 26 13 6 MEAN QFF PRESSURE IN HPA 1020.6 1015.9 1014.6 1011.6 1010.2 1000.5 994.7 1001.8 1007.2 1012.1 1021.0 1024.2 1011.2 MAX. QFF PRESSURE IN HPA 1027.5 1025.0 1030.1 1018.4 1019.3 1008.9 1001.1 1006.3 1016.6 1017.6 1033.7 1035.7 1035.7 DAY 22 28 2 30 1 6 3 30 26 15 25 11 MIN. QFF PRESSURE IN HPA 1007.4 1009.3 1004.0 1004.5 1003.2 992.4 990.8 998.6 999.6 1005.3 1011.4 1013.7 990.8 DAY 15 18 26 27 7 30 24 6 7 26 13 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 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.7 9.5 14.6 17.1 23.0 30.8 31.2 32.2 25.9 19.1 11.8 4.3 18.8 MINIMUN AIR TEMPERATURE (C) 1.3 2.7 7.5 10.5 15.4 22.3 22.7 23.2 16.4 10.5 6.1 -0.6 11.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 19 24 28 3 0 0 0 75 DAYS WITH MINIMUM TEMP. <=-4 1 0 0 0 0 0 0 0 0 0 0 4 5 DAYS WITH FREEZING MIN.<= 0 10 9 1 0 0 0 0 0 0 0 4 18 42 TEMPERATURE RECORDS LOWEST(C) -6.0 -1.5 0.0 3.2 11.0 16.5 19.4 18.0 8.5 5.4 -2.4 -5.5 -6.0 DAY 4 4 17 6 6 1 18 24 30 30 29 4 MAXIMUM AIR TEMPERATURE (C) 11.4 16.8 21.6 23.7 30.5 38.0 38.6 39.9 34.6 28.2 18.8 10.3 26.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 1 20 30 31 31 28 8 0 0 149 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 15.0 24.0 29.0 31.0 35.2 41.5 42.5 42.5 41.0 35.0 25.0 17.0 42.5 DAY 22 29 29 15 10 25 2 12 7 12 1 31 DIF. BETWEEN (MAX.-MIN.) (C) 10.1 14.1 14.1 13.2 15.1 15.7 15.9 16.7 18.2 17.7 12.7 10.9 14.5 MEAN DAILY TEMP. (MDT) (C) 6.3 9.7 14.6 17.1 22.9 30.2 30.6 31.5 25.5 19.3 12.4 4.9 18.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 2.4 71.6 274.9 298.7 327.0 138.8 18.9 0.0 0.0 1132.5 HEATING DEG. DAYS(BASE 18 0C) 362.6 239.4 119.3 57.4 0.0 0.0 0.0 0.0 0.0 20.8 167.4 407.3 1374.1 DEWPOINT (MEAN C) 1.0 -3.2 0.3 3.4 7.8 7.5 7.8 5.7 3.6 2.1 3.4 -1.7 3.1 MIXING RATIO (G/KG) 4.62 3.42 4.37 5.61 7.50 7.84 7.59 6.57 5.66 5.03 5.57 3.80 5.63 VAPOUR PRESSURE (HPA) 6.75 5.01 6.39 8.16 10.85 11.28 10.94 9.49 8.24 7.37 8.14 5.58 8.18 SATURATION DEF. (HPA) 2.71 7.57 11.68 12.55 18.79 35.19 36.57 40.78 27.82 16.46 6.66 3.00 18.32 RELATIVE HUMIDITY (MEAN %) 75 45 43 46 42 26 26 21 26 36 60 68 43 RELATIVE HUMIDITY (MAX. %) 91 68 65 71 64 40 42 34 42 54 81 85 61 RELATIVE HUMIDITY (MIN. %) 52 24 24 26 24 17 15 12 15 21 37 44 26 RELATIVE HUMIDITY (MEAN% 03UTC) 86 66 60 65 58 38 40 34 42 52 75 83 58 RELATIVE HUMIDITY (MEAN% 09UTC) 63 30 29 32 28 20 19 15 18 24 41 54 31 RELATIVE HUMIDITY (MEAN% 15UTC) 67 33 33 33 32 21 18 13 17 27 53 60 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 70.2 0.0 9.5 39.0 23.6 0.0 2.0 0.0 0.0 0.2 23.3 9.6 177.4 DAYS WITH PRECIPITATION >=10 4 0 0 1 1 0 0 0 0 0 1 0 7 DAYS WITH PRECIPITATION >= 5 4 0 1 3 1 0 0 0 0 0 1 1 11 DAYS WITH PRECIPITATION >= 1 6 0 4 7 4 0 1 0 0 0 3 2 27 DAYS WITH PRECIPITATION 7 2 5 8 9 0 3 0 0 1 9 5 49 GREATEST DAILY PRECIPITATION 22.0 0.0 5.0 15.0 14.0 0.0 2.0 0.0 0.0 0.2 17.0 6.0 22.0 DAY 7 ** 20 17 29 ** 12 ** ** 16 19 9 DAY WITH THUNDER STORM 0 0 0 1 2 0 0 0 0 0 0 0 3 DAYS WITH SNOW OR SLEET 2 0 0 0 0 0 0 0 0 0 0 0 2 DAYS WITH DUST 0 1 0 0 1 1 1 0 0 0 0 0 4 WIND DIRECTION (PREVAILING) 270 270 270 270 270 90 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.8 10.8 8.6 9.9 10.6 10.5 10.5 10.3 8.7 7.9 8.7 8.1 9.2 PREVAILING WIND PERCENT 16.5 27.6 23.4 22.1 31.9 25.0 28.6 35.5 20.8 15.3 21.7 20.2 18.1 CALMS PERCENT OF WIND 63.7 46.6 41.9 35.0 25.8 25.4 30.6 39.5 50.0 59.7 53.3 60.1 44.3 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 278 272 289 263 283 82 96 91 92 281 284 287 294 VECTOR WIND MAGNITUDE(KNOTS) 1.7 3.6 1.8 1.4 4.2 1.6 3.5 4.4 1.6 0.6 2.3 2.4 0.6 WIND STEADINESES (MEAN %) 56.7 64.3 38.3 25.0 56.0 21.6 51.5 77.2 41.0 18.8 59.0 75.0 12.0 WIND SPEED (MEAN KNOTS) 3.0 5.6 4.7 5.6 7.5 7.4 6.8 5.7 3.9 3.2 3.9 3.2 5.0 FASTEST WIND DIRECTION 110 250 270 260 290 60 290 90 120 290 280 310 290 FASTEST WIND SPEED (KNOTS) 19 35 33 31 35 27 29 23 19 37 29 23 37 DAY 13 23 3 24 3 22 12 17 16 22 28 27 DAYS WITH SKY CLEAR (0-2)/8 13 12 7 9 12 22 24 29 30 23 15 11 207 DAYS WITH P.CLOUDY (3-6)/8 12 17 18 14 15 8 7 2 0 8 11 15 127 DAYS WITH CLOUDY (7-8)/8 6 0 6 7 4 0 0 0 0 0 4 5 32 DAYS WITH VISIBILITY =< 2 KM 7 1 0 1 0 0 0 0 0 0 1 4 14 DURATION OF SUNSHINE HOURS 181.3 220.9 204.2 229.5 283.8 340.8 334.6 342.9 318.7 271.2 194.9 164.9 3087.7 ======================================================================================================================= 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 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 915.9 916.3 916.7 913.4 911.1 908.6 908.4 907.7 914.2 918.8 917.8 919.3 914.0 MAX. QFE PRESSURE IN HPA 923.7 923.4 926.5 920.8 917.6 918.3 915.9 914.5 922.1 926.1 925.2 930.7 930.7 DAY-HOUR 1- 0 10- 6 9- 6 11- 6 3-21 6- 6 18- 6 30- 6 30- 6 27- 6 29- 6 3- 6 MIN. QFE PRESSURE IN HPA 908.0 904.5 906.0 903.5 898.6 902.4 903.7 901.3 906.3 911.5 902.9 910.7 898.6 DAY-HOUR 23-15 15-12 31-12 17- 0 13-12 17-15 24-15 4-15 11-15 3-12 23-12 16-12 MEAN QNH PRESSURE IN HPA 1017.0 1017.5 1017.9 1014.3 1011.8 1009.1 1008.8 1008.0 1015.2 1020.2 1019.1 1020.7 1015.0 MAX. QNH PRESSURE IN HPA 1025.5 1025.2 1028.5 1022.3 1018.9 1019.6 1017.0 1015.5 1023.8 1028.1 1027.1 1033.1 1033.1 DAY-HOUR 1- 0 10- 6 9- 6 11- 6 3-21 6- 6 18- 6 30- 6 30- 6 27- 6 29- 6 3- 6 MIN. QNH PRESSURE IN HPA 1008.4 1004.6 1006.2 1003.5 998.2 1002.3 1003.7 1001.1 1006.6 1012.2 1002.8 1011.3 998.2 DAY-HOUR 23-15 15-12 31-12 17- 0 13-12 17-15 24-15 4-15 11-15 3-12 23-12 16-12 MEAN QFF PRESSURE IN HPA 1018.4 1017.5 1016.0 1011.4 1006.6 1001.3 1000.9 999.9 1009.2 1016.6 1018.1 1022.7 1011.5 MAX. QFF PRESSURE IN HPA 1028.7 1026.6 1027.1 1020.4 1014.4 1012.7 1009.1 1008.3 1020.0 1026.1 1029.6 1036.7 1036.7 DAY-HOUR 1- 6 8- 6 9- 6 6- 6 3-21 6- 6 18- 6 30- 6 30- 6 27- 6 29- 6 4- 6 MIN. QFF PRESSURE IN HPA 1009.2 1001.0 1001.9 998.8 993.3 994.7 995.5 993.1 999.2 1007.5 1000.7 1012.6 993.1 DAY-HOUR 27-12 15-12 31-12 17- 0 13- 9 17-12 10- 9 12-12 11-15 3-12 23-12 16-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 916.0 916.4 916.8 913.3 911.2 908.8 908.5 907.6 914.2 918.7 917.8 919.3 914.1 MAX. QFE PRESSURE IN HPA 923.7 921.5 923.7 919.1 917.3 916.1 912.8 911.6 920.2 923.6 923.7 929.5 929.5 DAY 1 10 9 11 4 6 18 30 30 27 29 4 MIN. QFE PRESSURE IN HPA 909.0 907.8 908.8 903.5 901.1 904.5 904.0 902.5 908.9 912.5 909.1 912.1 901.1 DAY 24 15 31 17 13 18 11 4 11 22 23 16 MEAN QNH PRESSURE IN HPA 1017.1 1017.6 1018.0 1014.2 1011.9 1009.3 1008.9 1008.0 1015.1 1020.1 1019.1 1020.7 1015.0 MAX. QNH PRESSURE IN HPA 1025.5 1023.1 1025.5 1020.5 1018.5 1017.2 1013.6 1012.3 1021.7 1025.4 1025.5 1031.8 1031.8 DAY 1 10 9 11 4 6 18 30 30 27 29 4 MIN. QNH PRESSURE IN HPA 1009.5 1008.2 1009.3 1003.5 1000.9 1004.6 1004.0 1002.4 1009.4 1013.3 1009.6 1012.9 1000.9 DAY 24 15 31 17 13 18 11 4 11 22 23 16 MEAN QFF PRESSURE IN HPA 1018.0 1017.2 1015.8 1011.1 1006.8 1001.6 1001.0 999.7 1008.9 1016.2 1017.7 1022.3 1011.4 MAX. QFF PRESSURE IN HPA 1028.0 1022.3 1023.3 1017.6 1013.6 1010.6 1006.1 1005.0 1017.7 1022.5 1027.3 1034.5 1034.5 DAY 1 10 17 11 4 6 18 30 30 27 29 4 MIN. QFF PRESSURE IN HPA 1009.9 1004.6 1003.7 998.8 995.4 995.9 996.8 994.4 1001.2 1008.7 1008.1 1014.3 994.4 DAY 24 15 31 17 13 18 11 12 12 22 23 16 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 916.1 916.8 917.4 914.2 912.1 910.2 910.0 909.2 915.5 919.6 918.3 919.5 914.9 MAX. QFE PRESSURE IN HPA 923.2 921.8 925.3 919.8 917.0 918.1 914.8 913.7 921.2 924.7 924.2 929.5 929.5 DAY 1 10 9 11 18 6 18 30 30 27 29 4 MIN. QFE PRESSURE IN HPA 909.2 907.1 908.0 905.0 902.3 905.3 905.6 904.7 910.1 912.8 907.9 912.3 902.3 DAY 27 15 31 17 13 18 10 4 11 22 23 16 MEAN QNH PRESSURE IN HPA 1017.2 1017.9 1018.7 1015.1 1012.9 1010.8 1010.5 1009.7 1016.6 1021.0 1019.6 1020.9 1015.9 MAX. QNH PRESSURE IN HPA 1024.9 1023.4 1027.2 1021.2 1018.2 1019.4 1015.8 1014.6 1022.8 1026.6 1026.0 1031.8 1031.8 DAY 1 10 9 11 18 6 18 30 30 27 29 4 MIN. QNH PRESSURE IN HPA 1009.7 1007.4 1008.4 1005.1 1002.2 1005.5 1005.8 1004.8 1010.7 1013.6 1008.3 1013.1 1002.2 DAY 27 15 31 17 13 18 10 4 11 22 23 16 MEAN QFF PRESSURE IN HPA 1018.8 1018.4 1017.1 1012.5 1008.0 1003.3 1002.9 1001.8 1011.1 1018.0 1019.0 1023.3 1012.8 MAX. QFF PRESSURE IN HPA 1028.1 1024.7 1026.0 1019.3 1013.7 1012.6 1008.8 1007.8 1019.7 1025.0 1029.3 1035.7 1035.7 DAY 1 8 9 11 18 6 18 30 30 27 29 4 MIN. QFF PRESSURE IN HPA 1009.9 1004.8 1003.8 1001.8 996.9 997.6 997.9 996.8 1003.3 1009.9 1007.4 1014.9 996.8 DAY 27 15 31 17 13 18 10 12 11 22 23 16 ======================================================================================================================= 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 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 917.2 917.9 918.4 914.9 912.4 910.6 910.4 909.9 916.4 920.7 919.3 920.8 915.8 MAX. QFE PRESSURE IN HPA 923.7 923.4 926.5 920.8 917.2 918.3 915.9 914.5 922.1 926.1 925.2 930.7 930.7 DAY 1 10 9 11 22 6 18 30 30 27 29 3 MIN. QFE PRESSURE IN HPA 909.7 906.9 908.0 906.6 901.7 906.2 905.6 904.7 910.7 914.6 909.1 913.0 901.7 DAY 27 23 31 17 13 17 10 4 11 22 23 16 MEAN QNH PRESSURE IN HPA 1018.4 1019.2 1019.7 1015.9 1013.2 1011.2 1011.0 1010.5 1017.6 1022.3 1020.7 1022.3 1016.8 MAX. QNH PRESSURE IN HPA 1025.5 1025.2 1028.5 1022.3 1018.4 1019.6 1017.0 1015.5 1023.8 1028.1 1027.1 1033.1 1033.1 DAY 1 10 9 11 22 6 18 30 30 27 29 3 MIN. QNH PRESSURE IN HPA 1010.2 1007.2 1008.4 1006.9 1001.5 1006.4 1005.8 1004.8 1011.3 1015.6 1009.6 1013.8 1001.5 DAY 27 23 31 17 13 17 10 4 11 22 23 16 MEAN QFF PRESSURE IN HPA 1020.1 1019.6 1017.9 1013.1 1008.0 1003.5 1003.1 1002.3 1011.6 1018.9 1020.0 1024.7 1013.6 MAX. QFF PRESSURE IN HPA 1028.7 1026.6 1027.1 1020.4 1013.7 1012.7 1009.1 1008.3 1020.0 1026.1 1029.6 1036.7 1036.7 DAY 1 8 9 6 18 6 18 30 30 27 29 4 MIN. QFF PRESSURE IN HPA 1010.2 1006.1 1003.7 1004.6 995.1 998.3 997.1 996.7 1003.8 1011.3 1009.0 1016.1 995.1 DAY 27 15 31 17 13 18 10 4 11 3 23 16 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 916.3 916.8 917.4 913.9 911.3 909.4 909.2 908.6 915.0 919.2 918.0 919.5 914.6 MAX. QFE PRESSURE IN HPA 922.6 923.1 924.8 920.1 917.0 916.8 914.6 913.4 920.5 925.0 923.8 930.2 930.2 DAY 12 8 9 12 22 6 18 30 30 27 29 3 MIN. QFE PRESSURE IN HPA 909.4 906.6 906.7 906.0 899.5 905.1 904.0 903.7 909.2 913.2 906.5 912.0 899.5 DAY 27 15 31 17 13 17 10 4 11 22 23 15 MEAN QNH PRESSURE IN HPA 1017.4 1018.0 1018.6 1014.9 1012.0 1009.9 1009.7 1009.1 1016.0 1020.6 1019.3 1021.0 1015.5 MAX. QNH PRESSURE IN HPA 1024.3 1024.8 1026.7 1021.6 1018.2 1018.0 1015.6 1014.3 1022.0 1026.9 1025.6 1032.6 1032.6 DAY 12 8 9 12 22 6 18 30 30 27 29 3 MIN. QNH PRESSURE IN HPA 1009.9 1006.9 1007.0 1006.2 999.1 1005.2 1004.0 1003.7 1009.7 1014.1 1006.8 1012.8 999.1 DAY 27 15 31 17 13 17 10 4 11 22 23 15 MEAN QFF PRESSURE IN HPA 1018.6 1017.7 1016.5 1011.8 1006.8 1002.0 1001.8 1000.8 1009.7 1016.7 1018.0 1022.7 1011.9 MAX. QFF PRESSURE IN HPA 1025.8 1025.8 1025.3 1018.9 1014.3 1011.6 1008.2 1006.9 1017.8 1024.7 1027.4 1034.7 1034.7 DAY 1 8 9 6 4 6 18 30 30 27 29 3 MIN. QFF PRESSURE IN HPA 1009.7 1003.8 1002.3 1003.2 993.3 996.8 995.5 995.2 1001.9 1009.6 1005.4 1013.8 993.3 DAY 27 15 31 16 13 18 10 4 11 3 23 15 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 915.0 914.9 915.5 912.4 909.8 907.3 907.1 906.4 912.8 917.4 916.5 918.1 912.8 MAX. QFE PRESSURE IN HPA 921.3 921.2 922.3 918.1 916.8 914.5 912.7 911.2 918.2 922.7 922.5 928.1 928.1 DAY 12 8 9 11 22 6 18 30 30 27 30 3 MIN. QFE PRESSURE IN HPA 908.3 904.5 906.0 905.9 898.6 902.7 904.3 901.8 907.2 911.5 902.9 910.7 898.6 DAY 23 15 31 17 13 17 23 4 11 3 23 16 MEAN QNH PRESSURE IN HPA 1016.0 1015.9 1016.6 1013.2 1010.4 1007.6 1007.4 1006.6 1013.6 1018.7 1017.7 1019.4 1013.6 MAX. QNH PRESSURE IN HPA 1022.9 1022.8 1024.0 1019.4 1018.0 1015.5 1013.5 1011.9 1019.5 1024.4 1024.2 1030.3 1030.3 DAY 12 8 9 11 22 6 18 30 30 27 30 3 MIN. QNH PRESSURE IN HPA 1008.7 1004.6 1006.2 1006.1 998.2 1002.6 1004.4 1001.6 1007.5 1012.2 1002.8 1011.3 998.2 DAY 23 15 31 17 13 17 23 4 11 3 23 16 MEAN QFF PRESSURE IN HPA 1016.9 1015.5 1014.5 1010.1 1005.3 999.8 999.4 998.3 1007.4 1014.8 1016.3 1021.0 1009.9 MAX. QFF PRESSURE IN HPA 1024.4 1023.5 1022.5 1016.3 1013.4 1008.9 1006.1 1004.8 1015.6 1021.8 1025.6 1032.2 1032.2 DAY 12 8 9 6 22 6 18 30 30 27 30 3 MIN. QFF PRESSURE IN HPA 1009.2 1001.0 1001.9 1001.4 993.6 994.7 995.5 993.1 999.8 1007.5 1000.7 1012.6 993.1 DAY 27 15 31 16 13 17 23 12 11 3 23 16 ======================================================================================================================= 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 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 915.4 915.1 915.4 912.2 909.5 906.7 906.3 905.6 912.4 917.5 917.0 918.6 912.6 MAX. QFE PRESSURE IN HPA 921.5 920.6 922.4 918.6 915.8 913.2 911.4 910.1 917.8 922.6 922.9 929.0 929.0 DAY 12 8 9 10 22 6 18 30 27 27 28 3 MIN. QFE PRESSURE IN HPA 908.0 904.5 906.3 905.1 899.5 902.4 903.7 901.3 906.3 911.9 905.3 911.5 899.5 DAY 23 15 31 16 15 17 24 4 11 3 23 16 MEAN QNH PRESSURE IN HPA 1016.4 1016.1 1016.5 1012.9 1010.1 1006.9 1006.6 1005.8 1013.2 1018.8 1018.2 1019.9 1013.4 MAX. QNH PRESSURE IN HPA 1023.1 1022.1 1024.1 1019.9 1016.9 1014.1 1012.1 1010.7 1019.1 1024.3 1024.6 1031.3 1031.3 DAY 12 8 9 10 22 6 18 30 27 27 28 3 MIN. QNH PRESSURE IN HPA 1008.4 1004.6 1006.6 1005.2 999.1 1002.3 1003.7 1001.1 1006.6 1012.6 1005.5 1012.2 999.1 DAY 23 15 31 16 15 17 24 4 11 3 23 16 MEAN QFF PRESSURE IN HPA 1017.9 1016.5 1014.9 1010.2 1005.1 999.4 998.9 998.0 1007.7 1015.7 1017.6 1022.2 1010.3 MAX. QFF PRESSURE IN HPA 1024.7 1023.8 1023.4 1017.3 1012.8 1007.3 1005.3 1004.0 1016.1 1023.0 1026.6 1034.3 1034.3 DAY 12 8 9 10 22 6 18 30 30 27 28 3 MIN. QFF PRESSURE IN HPA 1009.4 1002.0 1003.7 1000.9 994.1 995.0 995.5 993.2 999.2 1009.4 1004.1 1013.3 993.2 DAY 23 15 31 16 15 17 2 12 11 2 23 16 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 915.9 916.2 916.4 913.3 911.0 907.9 907.5 906.8 913.5 918.5 917.8 919.3 913.7 MAX. QFE PRESSURE IN HPA 922.1 921.0 923.0 919.2 916.5 914.1 912.6 911.4 918.7 922.9 923.6 929.9 929.9 DAY 12 8 9 10 3 5 7 30 26 27 28 3 MIN. QFE PRESSURE IN HPA 908.3 908.9 907.9 905.8 900.5 903.9 904.8 902.0 907.4 913.0 907.8 912.2 900.5 DAY 23 15 31 16 15 17 9 3 11 2 23 15 MEAN QNH PRESSURE IN HPA 1017.0 1017.4 1017.6 1014.1 1011.6 1008.3 1007.9 1007.1 1014.4 1019.9 1019.1 1020.7 1014.6 MAX. QNH PRESSURE IN HPA 1023.8 1022.6 1024.7 1020.6 1017.7 1015.0 1013.4 1012.1 1020.1 1024.6 1025.4 1032.2 1032.2 DAY 12 8 9 10 3 5 7 30 26 27 28 3 MIN. QNH PRESSURE IN HPA 1008.7 1009.4 1008.3 1006.0 1000.2 1003.9 1004.9 1001.9 1007.7 1013.8 1008.2 1013.0 1000.2 DAY 23 15 31 16 15 17 9 3 11 2 23 15 MEAN QFF PRESSURE IN HPA 1018.7 1017.7 1015.7 1011.2 1006.4 1000.5 999.9 998.9 1008.5 1016.5 1018.4 1023.0 1011.3 MAX. QFF PRESSURE IN HPA 1025.0 1024.0 1023.7 1017.7 1013.0 1007.9 1005.8 1005.0 1016.3 1023.3 1027.0 1035.3 1035.3 DAY 12 8 9 10 3 5 7 30 30 27 28 3 MIN. QFF PRESSURE IN HPA 1010.2 1008.0 1005.0 1001.3 995.1 995.3 996.2 994.0 1000.3 1009.6 1007.9 1015.2 994.0 DAY 23 15 30 16 15 29 2 3 11 2 23 16 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 915.9 916.6 916.6 913.5 911.4 908.4 908.1 907.4 914.1 918.7 917.9 919.1 914.0 MAX. QFE PRESSURE IN HPA 922.1 921.0 922.7 919.4 917.6 914.8 912.0 911.5 919.4 922.8 923.7 929.7 929.7 DAY 11 9 8 10 3 5 17 30 29 26 28 3 MIN. QFE PRESSURE IN HPA 908.6 909.7 909.0 904.2 900.5 903.9 904.7 902.5 907.8 912.8 909.9 912.2 900.5 DAY 23 14 31 16 15 17 9 3 11 21 23 15 MEAN QNH PRESSURE IN HPA 1017.0 1017.7 1017.7 1014.4 1012.1 1008.8 1008.5 1007.7 1015.0 1020.1 1019.2 1020.5 1014.9 MAX. QNH PRESSURE IN HPA 1023.8 1022.6 1024.4 1020.8 1018.9 1015.8 1012.8 1012.2 1020.8 1024.5 1025.5 1032.0 1032.0 DAY 11 9 8 10 3 5 17 30 29 26 28 3 MIN. QNH PRESSURE IN HPA 1009.1 1010.2 1009.5 1004.3 1000.2 1003.9 1004.8 1002.4 1008.2 1013.6 1010.5 1013.0 1000.2 DAY 23 14 31 16 15 17 9 3 11 21 23 15 MEAN QFF PRESSURE IN HPA 1018.1 1017.3 1015.5 1011.2 1006.8 1000.9 1000.6 999.4 1008.8 1016.2 1017.9 1022.3 1011.3 MAX. QFF PRESSURE IN HPA 1024.9 1022.7 1023.6 1017.6 1014.4 1009.3 1005.2 1005.0 1016.5 1022.2 1027.2 1035.0 1035.0 DAY 11 8 16 10 3 5 17 30 29 27 28 3 MIN. QFF PRESSURE IN HPA 1010.4 1007.6 1004.8 999.6 994.9 995.5 995.9 994.3 999.7 1009.0 1009.4 1014.2 994.3 DAY 23 14 30 16 15 17 9 3 11 2 23 16 ======================================================================================================================= 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 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.0 4.6 13.3 19.1 23.6 29.8 33.8 31.1 26.9 19.6 10.2 7.3 18.6 MINIMUN AIR TEMPERATURE (C) -0.7 -0.6 6.6 11.3 15.3 20.6 25.3 22.3 17.1 10.6 4.1 1.1 11.1 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 14 31 21 1 0 0 0 67 DAYS WITH MINIMUM TEMP. <=-4 6 6 0 0 0 0 0 0 0 0 0 3 15 DAYS WITH FREEZING MIN.<= 0 22 17 1 0 0 0 0 0 0 0 5 9 54 TEMPERATURE RECORDS LOWEST(C) -4.5 -7.0 -2.4 1.2 10.5 16.0 21.2 17.2 12.5 2.6 -0.8 -5.5 -7.0 DAY 15 11 27 8 4 4 30 20 30 25 26 30 MAXIMUM AIR TEMPERATURE (C) 10.1 10.6 20.1 26.5 31.0 37.6 41.1 38.7 36.0 28.6 17.3 15.0 26.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 10 24 30 31 31 30 19 0 0 175 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 20.2 20.5 28.0 36.0 34.5 42.0 45.0 44.2 39.6 33.5 25.3 22.3 45.0 DAY 1 28 31 25 27 17 18 6 3 18 1 7 DIF. BETWEEN (MAX.-MIN.) (C) 10.8 11.2 13.5 15.2 15.7 17.0 15.8 16.4 18.9 18.0 13.2 13.9 14.9 MEAN DAILY TEMP. (MDT) (C) 4.7 5.0 13.4 18.9 23.1 29.1 33.2 30.5 26.6 19.6 10.7 8.0 18.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 29.1 75.0 242.5 378.3 294.2 166.5 22.6 0.0 0.0 1208.4 HEATING DEG. DAYS(BASE 18 0C) 412.2 364.5 147.6 45.2 1.2 0.0 0.0 0.0 0.0 35.3 219.7 309.1 1534.8 DEWPOINT (MEAN C) -2.5 -2.7 0.7 1.8 5.5 6.8 8.2 8.7 3.9 2.1 1.9 -1.0 2.8 MIXING RATIO (G/KG) 3.57 3.53 4.71 5.13 6.41 6.98 7.67 8.01 5.68 4.96 4.95 4.00 5.47 VAPOUR PRESSURE (HPA) 5.24 5.17 6.86 7.47 9.31 10.07 11.05 11.54 8.24 7.26 7.25 5.87 7.94 SATURATION DEF. (HPA) 3.22 3.92 9.19 16.59 21.14 34.27 43.64 36.06 29.46 17.46 5.94 5.01 18.83 RELATIVE HUMIDITY (MEAN %) 66 63 48 36 34 25 22 27 25 34 60 59 42 RELATIVE HUMIDITY (MAX. %) 81 83 71 62 57 40 36 44 42 51 82 77 61 RELATIVE HUMIDITY (MIN. %) 45 41 28 19 18 16 13 17 13 19 35 36 25 RELATIVE HUMIDITY (MEAN% 03UTC) 77 78 66 55 54 38 35 43 41 49 79 76 58 RELATIVE HUMIDITY (MEAN% 09UTC) 55 48 32 21 22 19 16 20 17 23 41 42 30 RELATIVE HUMIDITY (MEAN% 15UTC) 60 54 36 25 22 18 15 18 16 24 50 51 32 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 40.9 18.5 45.2 9.1 0.9 0.0 0.0 0.0 0.0 0.0 22.3 9.5 146.4 DAYS WITH PRECIPITATION >=10 1 0 1 0 0 0 0 0 0 0 1 0 3 DAYS WITH PRECIPITATION >= 5 4 2 3 1 0 0 0 0 0 0 2 0 12 DAYS WITH PRECIPITATION >= 1 7 3 5 2 0 0 0 0 0 0 4 4 25 DAYS WITH PRECIPITATION 7 9 7 6 7 0 0 2 0 0 9 6 53 GREATEST DAILY PRECIPITATION 16.1 6.0 25.0 8.0 0.4 0.0 0.0 0.0 0.0 0.0 11.9 4.0 25.0 DAY 10 10 12 27 26 ** ** ** ** ** 8 24 DAY WITH THUNDER STORM 0 0 0 0 1 0 0 0 0 0 1 0 2 DAYS WITH SNOW OR SLEET 5 4 0 0 0 0 0 0 0 0 1 1 11 DAYS WITH DUST 0 0 0 0 1 0 1 1 0 0 0 0 3 WIND DIRECTION (PREVAILING) 270 270 270 270 270 90 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.6 7.9 10.0 9.9 10.0 9.7 9.2 9.7 7.9 7.1 7.4 6.9 8.4 PREVAILING WIND PERCENT 33.9 23.2 37.5 22.9 17.3 23.8 46.0 31.9 23.8 21.0 21.7 22.2 20.5 CALMS PERCENT OF WIND 44.0 40.6 25.4 30.4 31.5 28.3 24.2 35.9 40.0 43.1 55.8 51.6 37.5 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 275 303 278 280 306 27 92 84 87 257 291 265 309 VECTOR WIND MAGNITUDE(KNOTS) 3.3 1.7 4.5 2.7 1.7 1.4 4.8 3.7 1.0 0.8 1.4 1.1 0.7 WIND STEADINESES (MEAN %) 76.7 37.8 65.2 39.7 27.4 21.2 69.6 66.1 22.2 18.6 41.2 33.3 13.2 WIND SPEED (MEAN KNOTS) 4.3 4.5 6.9 6.8 6.2 6.6 6.9 5.6 4.5 4.3 3.4 3.3 5.3 FASTEST WIND DIRECTION 280 300 240 300 260 300 120 70 120 230 280 250 300 FASTEST WIND SPEED (KNOTS) 25 23 27 31 29 21 23 23 19 29 27 25 31 DAY 25 22 10 4 3 8 1 11 10 21 3 26 DAYS WITH SKY CLEAR (0-2)/8 17 13 13 12 16 29 25 29 29 28 17 18 246 DAYS WITH P.CLOUDY (3-6)/8 9 9 11 14 13 1 6 2 1 3 11 8 88 DAYS WITH CLOUDY (7-8)/8 5 6 7 4 2 0 0 0 0 0 2 5 31 DAYS WITH VISIBILITY =< 2 KM 5 2 0 0 0 0 0 0 0 0 0 1 8 DURATION OF SUNSHINE HOURS 201.0 189.1 245.0 243.3 298.7 364.7 335.1 351.3 314.5 279.6 210.6 207.4 3240.3 ======================================================================================================================= 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 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 917.9 916.5 913.5 915.6 912.7 908.2 906.7 908.4 911.1 917.4 919.7 920.0 914.0 MAX. QFE PRESSURE IN HPA 926.1 925.7 921.1 927.8 918.4 915.0 913.9 914.5 916.2 925.9 925.0 929.7 929.7 DAY-HOUR 8- 6 15- 6 27- 6 6- 6 19- 0 9- 3 28- 6 27- 6 9- 6 24- 6 15- 6 29- 6 MIN. QFE PRESSURE IN HPA 906.0 907.6 903.3 906.0 903.1 898.3 897.7 900.0 904.4 907.9 912.8 908.7 897.7 DAY-HOUR 23- 0 2- 0 24-12 3-15 5-15 20-15 5-15 7-15 5-15 20-12 5-21 24- 0 MEAN QNH PRESSURE IN HPA 1019.2 1017.7 1014.4 1016.7 1013.5 1008.7 1007.0 1008.9 1011.8 1018.7 1021.2 1021.5 1014.9 MAX. QNH PRESSURE IN HPA 1028.1 1027.7 1022.7 1030.0 1019.7 1016.0 1014.8 1015.5 1017.3 1027.9 1026.9 1032.0 1032.0 DAY-HOUR 8- 6 15- 6 27- 6 6- 6 19- 0 9- 3 28- 6 27- 6 9- 6 24- 6 15- 6 29- 6 MIN. QNH PRESSURE IN HPA 1006.2 1008.0 1003.3 1006.2 1003.1 997.8 997.2 999.7 1004.5 1008.3 1013.6 1009.2 997.2 DAY-HOUR 23- 0 2- 0 24-12 3-15 5-15 20-15 5-15 7-15 5-15 20-12 5-21 24- 0 MEAN QFF PRESSURE IN HPA 1021.3 1019.5 1012.9 1013.1 1008.3 1001.3 998.3 1001.0 1005.4 1014.9 1020.8 1022.3 1011.6 MAX. QFF PRESSURE IN HPA 1031.2 1031.2 1023.8 1030.4 1014.4 1010.7 1006.9 1007.9 1010.8 1027.1 1028.6 1035.9 1035.9 DAY-HOUR 13- 6 15- 6 27- 6 6- 6 19- 0 9- 6 29- 3 27- 6 9- 6 24- 6 25- 6 31- 6 MIN. QFF PRESSURE IN HPA 1008.6 1007.0 1000.7 1001.3 999.1 989.4 988.2 990.8 997.4 1003.0 1010.3 1009.3 988.2 DAY-HOUR 23- 0 2- 0 24- 9 26-18 5-21 20-15 5-15 7-15 5-15 20-12 5-21 24- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 917.9 916.4 913.6 915.8 913.0 908.6 906.6 908.5 911.2 917.5 919.8 919.9 914.1 MAX. QFE PRESSURE IN HPA 924.0 924.4 919.1 924.7 918.4 913.0 911.8 913.0 913.6 923.8 923.8 928.1 928.1 DAY 9 16 27 6 19 9 29 15 22 24 14 29 MIN. QFE PRESSURE IN HPA 906.0 907.6 906.0 909.0 904.5 902.4 899.5 902.1 906.4 910.6 912.9 908.7 899.5 DAY 23 2 24 4 6 20 6 8 5 20 6 24 MEAN QNH PRESSURE IN HPA 1019.2 1017.6 1014.5 1016.9 1013.8 1009.0 1006.9 1009.0 1011.9 1018.8 1021.2 1021.4 1015.0 MAX. QNH PRESSURE IN HPA 1025.8 1026.3 1020.5 1026.6 1019.7 1013.8 1012.5 1013.8 1014.5 1025.6 1025.6 1030.3 1030.3 DAY 9 16 27 6 19 9 29 15 22 24 14 29 MIN. QNH PRESSURE IN HPA 1006.2 1008.0 1006.2 1009.5 1004.6 1002.3 999.1 1002.0 1006.7 1011.2 1013.7 1009.2 999.1 DAY 23 2 24 4 6 20 6 8 5 20 6 24 MEAN QFF PRESSURE IN HPA 1020.8 1019.1 1012.9 1013.2 1008.5 1001.7 998.1 1001.0 1005.4 1014.7 1020.4 1021.7 1011.4 MAX. QFF PRESSURE IN HPA 1028.6 1029.1 1021.7 1025.9 1014.4 1007.7 1004.4 1006.0 1007.8 1023.7 1025.8 1033.1 1033.1 DAY 14 16 27 6 19 9 29 18 30 24 29 29 MIN. QFF PRESSURE IN HPA 1008.6 1007.0 1004.0 1004.0 1000.7 994.5 990.0 993.0 999.4 1006.0 1011.3 1009.3 990.0 DAY 23 2 24 27 6 21 6 8 5 21 6 24 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.1 916.8 914.3 916.5 913.9 910.0 908.0 909.8 912.4 918.3 920.1 920.3 914.9 MAX. QFE PRESSURE IN HPA 924.5 924.3 920.1 926.5 918.0 915.0 913.7 913.7 915.2 924.8 924.0 928.1 928.1 DAY 8 15 27 6 19 9 29 27 9 24 25 29 MIN. QFE PRESSURE IN HPA 906.4 909.1 905.0 909.5 906.7 903.4 900.6 903.5 907.5 911.4 913.4 910.5 900.6 DAY 23 2 24 30 4 20 6 7 5 20 6 24 MEAN QNH PRESSURE IN HPA 1019.4 1017.9 1015.3 1017.7 1014.8 1010.5 1008.4 1010.4 1013.2 1019.6 1021.6 1021.8 1015.9 MAX. QNH PRESSURE IN HPA 1026.4 1026.1 1021.6 1028.5 1019.3 1016.0 1014.6 1014.6 1016.2 1026.7 1025.8 1030.3 1030.3 DAY 8 15 27 6 19 9 29 27 9 24 25 29 MIN. QNH PRESSURE IN HPA 1006.7 1009.6 1005.1 1010.0 1007.0 1003.4 1000.3 1003.5 1007.9 1012.1 1014.3 1011.1 1000.3 DAY 23 2 24 30 4 20 6 7 5 20 6 24 MEAN QFF PRESSURE IN HPA 1021.8 1020.1 1014.1 1014.5 1009.9 1003.4 999.8 1002.7 1007.3 1016.5 1021.8 1023.0 1012.9 MAX. QFF PRESSURE IN HPA 1029.5 1029.8 1023.4 1028.7 1014.1 1010.5 1006.9 1007.4 1010.5 1026.5 1027.2 1034.0 1034.0 DAY 13 15 27 6 19 9 29 28 28 24 25 30 MIN. QFF PRESSURE IN HPA 1009.2 1009.6 1002.9 1005.4 1002.4 994.9 991.9 994.6 1001.0 1007.6 1012.9 1011.6 991.9 DAY 23 2 24 30 3 21 6 7 5 21 6 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 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 919.1 917.7 915.1 917.4 914.4 910.3 908.7 910.5 913.2 919.3 921.1 921.6 915.7 MAX. QFE PRESSURE IN HPA 926.1 925.7 921.1 927.8 918.1 915.0 913.9 914.5 916.2 925.9 925.0 929.7 929.7 DAY 8 15 27 6 12 9 28 27 9 24 15 29 MIN. QFE PRESSURE IN HPA 906.6 910.0 905.1 910.0 907.4 903.0 901.1 904.2 908.4 911.8 915.4 912.6 901.1 DAY 23 2 24 30 4 20 6 7 5 20 6 24 MEAN QNH PRESSURE IN HPA 1020.5 1018.9 1016.1 1018.6 1015.3 1010.9 1009.1 1011.1 1014.1 1020.7 1022.7 1023.2 1016.8 MAX. QNH PRESSURE IN HPA 1028.1 1027.7 1022.7 1030.0 1019.4 1016.0 1014.8 1015.5 1017.3 1027.9 1026.9 1032.0 1032.0 DAY 8 15 27 6 12 9 28 27 9 24 15 29 MIN. QNH PRESSURE IN HPA 1006.9 1010.6 1005.2 1010.6 1007.7 1003.0 1000.9 1004.3 1008.8 1012.5 1016.5 1013.4 1000.9 DAY 23 2 24 30 4 20 6 7 5 20 6 24 MEAN QFF PRESSURE IN HPA 1023.1 1021.0 1014.8 1015.0 1010.1 1003.4 1000.4 1003.1 1007.8 1017.1 1022.6 1024.5 1013.6 MAX. QFF PRESSURE IN HPA 1031.2 1031.2 1023.8 1030.4 1014.3 1010.7 1006.6 1007.9 1010.8 1027.1 1028.6 1035.9 1035.9 DAY 13 15 27 6 12 9 28 27 9 24 25 31 MIN. QFF PRESSURE IN HPA 1010.1 1011.2 1003.0 1005.2 1002.6 994.9 991.9 994.9 1001.9 1008.1 1014.6 1014.0 991.9 DAY 23 2 24 30 3 20 6 7 5 20 6 24 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.2 917.0 914.0 916.3 913.1 909.0 907.7 909.3 911.8 917.7 920.0 920.2 914.5 MAX. QFE PRESSURE IN HPA 925.9 925.3 919.9 926.7 917.7 913.7 912.6 913.2 914.8 923.8 924.2 928.8 928.8 DAY 8 15 27 6 18 10 28 16 9 24 27 29 MIN. QFE PRESSURE IN HPA 906.2 910.6 903.4 908.9 905.7 901.1 900.3 903.2 906.7 909.6 915.2 911.9 900.3 DAY 23 2 24 30 3 20 6 7 5 20 8 26 MEAN QNH PRESSURE IN HPA 1019.5 1018.2 1014.9 1017.4 1013.9 1009.5 1008.1 1009.8 1012.5 1019.0 1021.5 1021.6 1015.5 MAX. QNH PRESSURE IN HPA 1027.9 1027.2 1021.4 1028.8 1019.0 1014.6 1013.4 1014.1 1015.8 1025.6 1026.0 1031.0 1031.0 DAY 8 15 27 6 18 10 28 16 9 24 27 29 MIN. QNH PRESSURE IN HPA 1006.4 1011.2 1003.4 1009.4 1005.9 1000.9 1000.0 1003.2 1007.0 1010.1 1016.2 1012.6 1000.0 DAY 23 2 24 30 3 20 6 7 5 20 8 26 MEAN QFF PRESSURE IN HPA 1021.4 1019.9 1013.2 1013.7 1008.5 1002.1 999.3 1001.9 1006.0 1014.9 1020.8 1022.0 1012.0 MAX. QFF PRESSURE IN HPA 1030.2 1030.5 1022.1 1029.1 1013.1 1008.5 1005.5 1006.7 1009.3 1024.0 1026.8 1034.1 1034.1 DAY 8 15 27 6 18 9 28 31 9 24 27 29 MIN. QFF PRESSURE IN HPA 1009.4 1011.4 1000.7 1004.1 1000.3 992.5 990.9 994.0 999.7 1004.5 1013.8 1011.7 990.9 DAY 23 2 24 30 3 20 6 7 5 20 5 26 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 917.0 915.6 912.0 914.3 911.2 907.0 905.7 907.2 909.6 916.0 918.6 918.9 912.7 MAX. QFE PRESSURE IN HPA 924.2 924.0 917.4 923.3 915.8 911.6 910.5 910.8 912.2 922.8 922.5 927.3 927.3 DAY 9 15 26 6 18 10 28 17 9 12 15 29 MIN. QFE PRESSURE IN HPA 906.2 909.5 903.3 907.2 903.5 899.1 898.5 900.5 904.8 907.9 913.4 911.5 898.5 DAY 23 1 24 2 5 20 6 7 5 20 8 24 MEAN QNH PRESSURE IN HPA 1018.2 1016.7 1012.7 1015.2 1011.9 1007.3 1005.9 1007.5 1010.2 1017.2 1019.9 1020.3 1013.6 MAX. QNH PRESSURE IN HPA 1026.0 1025.8 1018.6 1025.1 1016.9 1012.3 1011.1 1011.5 1013.0 1024.5 1024.2 1029.4 1029.4 DAY 9 15 26 6 18 10 28 17 9 12 15 29 MIN. QNH PRESSURE IN HPA 1006.4 1010.0 1003.3 1007.5 1003.5 998.7 998.1 1000.2 1004.9 1008.3 1014.3 1012.2 998.1 DAY 23 1 24 2 5 20 6 7 5 20 8 24 MEAN QFF PRESSURE IN HPA 1019.7 1018.1 1011.0 1011.6 1006.5 999.9 997.2 999.5 1003.5 1013.0 1019.2 1020.5 1010.0 MAX. QFF PRESSURE IN HPA 1028.1 1028.7 1019.2 1025.0 1011.5 1006.1 1003.1 1004.9 1006.4 1021.8 1024.6 1032.1 1032.1 DAY 13 15 26 6 18 10 28 31 9 24 27 29 MIN. QFF PRESSURE IN HPA 1008.8 1009.2 1001.7 1001.6 999.8 990.4 988.8 991.2 997.7 1003.0 1013.2 1011.7 988.8 DAY 23 28 24 26 5 20 6 7 5 20 8 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 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 917.4 915.8 912.0 914.0 910.9 906.2 904.9 906.5 909.3 916.0 919.1 919.4 912.6 MAX. QFE PRESSURE IN HPA 924.5 924.0 917.0 922.6 915.3 910.9 909.8 910.5 911.6 922.2 923.1 927.9 927.9 DAY 9 15 26 6 13 10 28 17 9 23 23 29 MIN. QFE PRESSURE IN HPA 908.4 908.6 906.5 906.0 903.1 898.3 897.7 900.0 904.4 908.2 914.5 911.6 897.7 DAY 23 1 24 3 5 20 5 7 5 20 8 25 MEAN QNH PRESSURE IN HPA 1018.6 1016.9 1012.8 1014.9 1011.5 1006.4 1005.0 1006.7 1009.9 1017.1 1020.4 1020.8 1013.4 MAX. QNH PRESSURE IN HPA 1026.4 1025.8 1018.2 1024.3 1016.3 1011.6 1010.4 1011.1 1012.3 1023.9 1024.8 1030.1 1030.1 DAY 9 15 26 6 13 10 28 17 9 23 23 29 MIN. QNH PRESSURE IN HPA 1008.8 1009.1 1006.8 1006.2 1003.1 997.8 997.2 999.7 1004.5 1008.6 1015.5 1012.3 997.2 DAY 23 1 24 3 5 20 5 7 5 20 8 25 MEAN QFF PRESSURE IN HPA 1020.9 1019.0 1011.5 1011.7 1006.6 999.1 996.5 999.1 1004.0 1014.0 1020.6 1022.0 1010.4 MAX. QFF PRESSURE IN HPA 1029.2 1029.1 1019.2 1024.5 1011.7 1005.4 1003.0 1005.2 1007.1 1023.6 1026.1 1033.7 1033.7 DAY 13 15 26 6 13 10 28 31 28 24 27 29 MIN. QFF PRESSURE IN HPA 1010.7 1009.9 1005.4 1001.6 999.6 989.4 988.2 990.8 997.4 1004.5 1014.1 1012.6 988.2 DAY 3 1 23 3 5 20 5 7 5 20 5 25 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 918.1 916.6 913.4 915.2 912.5 907.2 905.7 907.6 910.4 917.2 919.7 920.0 913.6 MAX. QFE PRESSURE IN HPA 924.5 924.4 918.5 922.9 916.1 912.0 910.5 912.2 912.6 923.5 924.0 928.1 928.1 DAY 9 15 26 6 18 8 28 31 19 23 23 29 MIN. QFE PRESSURE IN HPA 910.1 908.0 907.0 907.5 905.0 899.9 898.7 900.7 905.7 910.3 914.3 911.1 898.7 DAY 24 1 23 26 5 20 5 7 5 20 5 23 MEAN QNH PRESSURE IN HPA 1019.4 1017.8 1014.2 1016.2 1013.3 1007.6 1005.9 1008.0 1011.0 1018.4 1021.2 1021.5 1014.5 MAX. QNH PRESSURE IN HPA 1026.4 1026.3 1019.8 1024.6 1017.2 1012.8 1011.1 1013.0 1013.4 1025.3 1025.8 1030.3 1030.3 DAY 9 15 26 6 18 8 28 31 19 23 23 29 MIN. QNH PRESSURE IN HPA 1010.7 1008.4 1007.3 1007.9 1005.1 999.6 998.3 1000.5 1005.9 1010.9 1015.3 1011.8 998.3 DAY 24 1 23 26 5 20 5 7 5 20 5 23 MEAN QFF PRESSURE IN HPA 1021.9 1019.8 1012.8 1012.6 1008.0 1000.0 997.2 1000.0 1004.8 1014.8 1021.1 1022.9 1011.3 MAX. QFF PRESSURE IN HPA 1030.4 1029.8 1020.7 1024.9 1012.1 1006.5 1003.0 1007.2 1008.4 1023.8 1026.9 1034.3 1034.3 DAY 13 15 26 6 21 8 28 31 30 23 27 29 MIN. QFF PRESSURE IN HPA 1011.9 1009.2 1005.5 1001.3 1001.0 991.0 989.4 991.1 998.8 1006.2 1013.0 1012.1 989.4 DAY 24 1 23 26 5 20 5 7 4 20 5 25 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 917.9 916.6 913.7 915.6 913.0 907.9 906.4 908.2 910.8 917.6 919.7 920.1 913.9 MAX. QFE PRESSURE IN HPA 924.2 924.6 918.9 924.1 916.5 913.2 911.1 913.7 913.9 923.8 923.6 927.7 927.7 DAY 8 17 26 5 21 8 28 13 30 23 27 29 MIN. QFE PRESSURE IN HPA 910.2 907.7 906.2 908.6 903.7 901.3 899.5 900.9 906.2 910.3 912.8 909.1 899.5 DAY 22 1 23 3 5 20 5 7 4 20 5 23 MEAN QNH PRESSURE IN HPA 1019.2 1017.7 1014.7 1016.7 1013.8 1008.3 1006.6 1008.7 1011.5 1018.8 1021.1 1021.6 1014.9 MAX. QNH PRESSURE IN HPA 1026.0 1026.5 1020.3 1025.9 1017.7 1014.1 1011.8 1014.6 1014.8 1025.6 1025.4 1029.8 1029.8 DAY 8 17 26 5 21 8 28 13 30 23 27 29 MIN. QNH PRESSURE IN HPA 1010.8 1008.1 1006.4 1009.1 1003.7 1001.1 999.1 1000.7 1006.4 1010.9 1013.6 1009.6 999.1 DAY 22 1 23 3 5 20 5 7 4 20 5 23 MEAN QFF PRESSURE IN HPA 1021.0 1019.3 1012.9 1012.8 1008.3 1000.8 997.8 1000.7 1004.9 1014.7 1020.5 1022.1 1011.3 MAX. QFF PRESSURE IN HPA 1029.1 1029.6 1021.2 1025.4 1012.6 1008.2 1003.9 1007.1 1009.1 1023.7 1026.1 1033.0 1033.0 DAY 13 15 26 5 21 8 28 31 30 23 25 29 MIN. QFF PRESSURE IN HPA 1012.0 1008.5 1003.8 1003.5 999.1 993.0 990.1 991.1 999.0 1005.8 1010.3 1009.5 990.1 DAY 24 1 23 26 5 20 5 7 5 20 5 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 CLIMATOLOGICAL NORMALS FOR THE PERIOD 1986-2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 3.9 6.3 11.4 18.2 23.7 29.6 32.2 30.9 25.5 18.6 10.9 5.5 18.1 MINIMUN AIR TEMPERATURE (C) -1.5 0.1 4.5 10.3 15.1 20.0 23.0 21.1 15.4 9.9 4.0 -0.1 10.2 DAYS WITH MINIMUM TEMP. >=21 0.0 0.0 0.0 0.0 0.7 11.9 24.6 17.4 0.8 0.1 0.0 0.0 55.5 DAYS WITH MINIMUM TEMP. <=-4 7.8 3.7 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.3 4.9 18.6 DAYS WITH FREEZING MIN.<= 0 21.9 14.8 4.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 5.5 16.9 63.5 TEMPERATURE RECORDS LOWEST(C) -12.6 -11.2 -11.0 0.4 5.4 8.0 15.0 13.5 6.5 0.6 -7.0 -10.5 -12.6 YEAR-DAY 93-11 97- 8 92-11 88- 4 92- 5 94- 6 87-29 91-26 94-22 93-10 92-28 92-29 93-11 MAXIMUM AIR TEMPERATURE (C) 10.5 13.4 18.3 26.0 31.6 37.8 40.1 39.4 34.9 27.4 18.8 12.3 25.9 DAYS WITH MAXIMUM TEMP. >=30 0.0 0.0 0.1 6.6 21.9 29.9 30.9 30.9 27.7 9.8 0.0 0.0 157.8 DAYS WITH MAXIMUM TEMP. <= 0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.3 TEMPERATURE RECORDS HIGHEST(C) 23.4 24.0 30.0 36.0 41.5 44.2 46.0 45.5 41.0 36.6 28.4 22.3 46.0 YEAR-DAY 87-31 2-26 1-31 98-16 99-31 89-30 3-17 97-14 87- 6 95- 4 86- 1 5- 7 3-17 DIF. BETWEEN (MAX.-MIN.) (C) 12.0 13.3 13.8 15.7 16.5 17.8 17.1 18.3 19.5 17.5 14.8 12.4 15.7 MEAN DAILY TEMP. (MDT) (C) 4.5 6.7 11.4 18.1 23.3 28.9 31.6 30.3 25.1 18.7 11.4 6.1 18.0 STANDARD DEVIATION OF MDT(C) 1.74 1.98 1.89 1.18 1.38 0.84 1.02 0.94 1.20 1.64 1.17 1.45 1.37 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.1 10.9 87.6 236.0 327.5 287.1 127.5 13.9 0.0 0.0 1090.6 HEATING DEG. DAYS(BASE 18 0C) 418.6 317.9 205.3 40.3 3.2 0.0 0.0 0.0 0.1 31.5 199.0 367.9 1583.8 DEWPOINT (MEAN C) -2.8 -2.8 -0.5 2.8 4.1 4.8 7.0 6.4 3.0 2.0 0.1 -1.3 1.9 MIXING RATIO (G/KG) 3.50 3.57 4.31 5.46 5.97 6.28 7.21 6.97 5.45 5.05 4.47 3.98 5.18 VAPOUR PRESSURE (HPA) 5.14 5.23 6.29 7.93 8.67 9.06 10.38 10.05 7.91 7.38 6.54 5.84 7.53 SATURATION DEF. (HPA) 3.38 4.98 8.08 14.45 22.60 34.76 40.07 37.16 27.27 15.72 7.47 3.71 18.30 RELATIVE HUMIDITY (MEAN %) 65 57 50 42 33 24 23 24 26 37 52 65 41 RELATIVE HUMIDITY (MAX. %) 83 78 73 66 55 40 39 40 43 56 73 83 61 RELATIVE HUMIDITY (MIN. %) 42 34 29 22 18 13 13 14 14 21 31 43 25 RELATIVE HUMIDITY (MEAN% 03UTC) 79 74 68 61 51 38 37 39 42 53 69 80 58 RELATIVE HUMIDITY (MEAN% 09UTC) 50 41 35 27 22 17 17 17 17 25 36 50 30 RELATIVE HUMIDITY (MEAN% 15UTC) 58 47 39 30 23 15 14 15 18 29 44 58 33 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 25.9 21.7 28.1 19.6 11.8 1.4 0.9 0.4 0.5 6.3 15.2 19.3 151.1 DAYS WITH PRECIPITATION >=10 0.6 0.7 0.6 0.5 0.3 0.0 0.0 0.0 0.0 0.0 0.5 0.6 3.8 DAYS WITH PRECIPITATION >= 5 1.8 1.6 1.9 1.2 0.8 0.1 0.0 0.1 0.0 0.5 1.0 1.3 10.3 DAYS WITH PRECIPITATION >= 1 4.4 3.9 4.7 3.7 2.2 0.3 0.3 0.2 0.2 1.7 2.6 3.1 27.3 DAYS WITH PRECIPITATION 6.5 6.4 7.5 6.1 4.6 0.6 0.8 0.3 0.3 2.7 4.1 5.3 45.2 GREATEST DAILY PRECIPITATION 25.0 21.0 40.0 26.0 22.0 8.0 4.0 5.0 3.8 9.0 35.0 28.0 40.0 YEAR-DAY 0-28 94- 1 86- 8 2-12 86- 4 89- 7 88-11 98- 2 87-21 94-18 99- 8 0- 1 86 DAY WITH THUNDER STORM 0.0 0.0 0.2 1.1 1.5 0.3 0.1 0.0 0.3 0.4 0.2 0.0 4.1 DAYS WITH SNOW OR SLEET 3.1 1.5 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.9 6.1 DAYS WITH DUST 0.9 0.8 1.1 1.5 1.3 0.9 1.4 0.7 0.5 0.2 0.9 0.5 10.7 WIND DIRECTION (PREVAILING) 270 270 270 270 270 90 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.1 8.5 9.3 8.8 9.0 9.2 9.9 9.3 7.9 7.1 7.4 7.6 8.3 PREVAILING WIND PERCENT 18.2 22.8 21.9 21.7 21.7 20.0 35.4 33.2 17.6 12.4 12.1 13.0 14.8 CALMS PERCENT OF WIND 66.7 53.4 49.1 43.0 39.9 39.1 40.8 47.3 56.7 62.2 69.8 73.2 53.4 NO. OF WIND OBSERVATION 248.0 225.8 245.0 240.0 244.5 240.0 247.9 248.0 240.0 247.7 240.0 248.0 2914.9 VECTOR WIND DIRECTION (MEAN) 283 286 285 288 295 25 88 88 66 299 288 282 314 VECTOR WIND MAGNITUDE(KNOTS) 1.8 2.6 2.4 2.7 2.4 0.8 3.7 3.4 0.7 0.6 1.0 1.1 0.7 WIND STEADINESES (MEAN %) 72.0 66.7 55.8 52.9 45.3 14.8 68.5 75.6 21.2 22.2 45.5 57.9 17.9 WIND SPEED (MEAN KNOTS) 2.5 3.9 4.3 5.1 5.3 5.4 5.4 4.5 3.3 2.7 2.2 1.9 3.9 FASTEST WIND DIRECTION 280 290 280 250 310 270 110 30 210 240 300 280 250 FASTEST WIND SPEED (KNOTS) 29 41 39 49 43 33 31 29 29 37 33 31 49 YEAR-DAY 87-30 90-16 90-14 0-21 90-12 97-16 88- 6 93- 9 95-25 86-23 95-25 89- 5 0 DAYS WITH SKY CLEAR (0-2)/8 14.9 13.6 12.8 11.0 18.0 26.7 27.9 28.3 28.4 22.6 16.6 13.8 234.6 DAYS WITH P.CLOUDY (3-6)/8 10.4 9.6 11.7 14.7 10.4 3.0 3.0 2.7 1.5 6.8 9.7 11.5 95.0 DAYS WITH CLOUDY (7-8)/8 5.7 4.9 6.4 4.3 2.5 0.3 0.0 0.0 0.1 1.5 3.7 5.6 35.0 DAYS WITH VISIBILITY =< 2 KM 2.4 1.1 0.6 0.3 0.4 0.1 0.1 0.0 0.1 0.2 0.6 2.0 7.9 DURATION OF SUNSHINE HOURS 186.2 198.6 220.7 232.2 301.8 355.6 358.5 348.6 311.3 265.9 202.4 170.6 3152.4 ======================================================================================================================= 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 CLIMATOLOGICAL NORMALS FOR THE PERIOD 1986-2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 918.1 916.3 914.2 913.2 912.1 908.0 906.6 908.4 912.4 917.3 918.8 919.3 913.7 MAX. QFE PRESSURE IN HPA 931.8 931.1 929.8 929.0 923.7 919.6 917.0 920.0 925.5 928.1 933.0 932.6 933.0 YEAR-DAY 99- 2 98-23 2-11 94- 5 3- 2 93-23 0-30 92-31 94-23 90-19 87-30 87- 1 87-30 MIN. QFE PRESSURE IN HPA 904.6 900.2 900.6 900.7 898.6 897.6 896.3 898.6 902.2 906.6 902.9 900.8 896.3 YEAR-DAY 3-28 1-21 97-29 90-15 4-13 91-11 95-16 94- 2 0- 1 96-27 4-23 88-27 95-16 MEAN QNH PRESSURE IN HPA 1019.4 1017.5 1015.1 1014.1 1012.8 1008.4 1006.9 1008.9 1013.1 1018.5 1020.2 1020.7 1014.6 MAX. QNH PRESSURE IN HPA 1034.3 1033.5 1032.1 1031.3 1025.5 1021.0 1018.2 1021.5 1027.5 1030.3 1035.6 1035.2 1035.6 YEAR-DAY 99- 2 98-23 2-11 94- 5 3- 2 93-23 0-30 92-31 94-23 90-19 87-30 87- 1 87-30 MIN. QNH PRESSURE IN HPA 1004.7 999.9 1000.3 1000.5 998.2 997.1 995.7 998.2 1002.1 1006.9 1002.8 1000.6 995.7 YEAR-DAY 3-28 1-21 97-29 90-15 4-13 91-11 95-16 94- 2 0- 1 96-27 4-23 88-27 95-16 MEAN QFF PRESSURE IN HPA 1021.6 1018.6 1014.4 1010.8 1007.7 1001.1 998.7 1001.1 1007.3 1015.1 1019.6 1022.2 1011.5 MAX. QFF PRESSURE IN HPA 1037.1 1038.1 1035.6 1031.1 1023.2 1015.4 1010.5 1016.3 1023.8 1029.2 1039.3 1039.2 1039.3 YEAR-DAY 92-10 89- 4 92-12 94- 5 3- 2 93-23 87-29 92-31 94-23 90-19 87-30 90-28 87-30 MIN. QFF PRESSURE IN HPA 1005.2 999.3 998.3 996.5 993.2 989.4 986.7 990.0 994.9 1001.0 1000.7 1002.7 986.7 YEAR-DAY 97-16 1-21 1-25 90-15 99-20 5-20 95-16 94- 1 0- 1 98- 1 4-23 94- 4 95-16 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 918.1 916.3 914.0 913.3 912.4 908.3 906.7 908.5 912.4 917.3 918.8 919.3 913.8 MAX. QFE PRESSURE IN HPA 928.6 928.8 927.3 924.7 920.9 918.0 916.0 917.4 922.9 925.8 931.5 931.3 931.5 YEAR-DAY 92- 5 98-23 2-11 5- 6 3- 2 93-23 0-31 92-31 94-23 90-16 87-30 87- 1 87-30 MIN. QFE PRESSURE IN HPA 904.8 904.6 900.8 903.0 901.1 899.3 898.6 900.6 903.0 909.0 905.4 903.2 898.6 YEAR-DAY 98-13 98- 8 87-14 92-18 4-13 99-25 97-16 94- 2 0- 1 96-27 94-26 94- 4 97-16 MEAN QNH PRESSURE IN HPA 1019.4 1017.4 1015.0 1014.2 1013.2 1008.7 1007.0 1008.9 1013.2 1018.5 1020.1 1020.7 1014.7 MAX. QNH PRESSURE IN HPA 1030.8 1031.0 1029.4 1026.6 1022.4 1019.3 1017.1 1018.6 1024.6 1027.8 1034.0 1033.8 1034.0 YEAR-DAY 92- 5 98-23 2-11 5- 6 3- 2 93-23 0-31 92-31 94-23 90-16 87-30 87- 1 87-30 MIN. QNH PRESSURE IN HPA 1004.9 1004.7 1000.6 1003.0 1000.9 998.9 998.2 1000.3 1003.0 1009.5 1005.6 1003.2 998.2 YEAR-DAY 98-13 98- 8 87-14 92-18 4-13 99-25 97-16 94- 2 0- 1 96-27 94-26 94- 4 97-16 MEAN QFF PRESSURE IN HPA 1021.1 1018.2 1013.9 1010.7 1007.9 1001.4 998.7 1001.0 1007.1 1014.7 1019.1 1021.7 1011.3 MAX. QFF PRESSURE IN HPA 1035.4 1034.2 1031.9 1025.9 1019.7 1013.7 1009.9 1013.2 1021.1 1027.8 1036.5 1036.4 1036.5 YEAR-DAY 92- 5 91-15 92-12 94- 6 92- 3 93-23 0-31 92-31 94-23 87-29 87-30 86- 7 87-30 MIN. QFF PRESSURE IN HPA 1007.0 1002.9 998.3 998.8 995.4 991.3 988.9 991.0 995.5 1004.0 1004.6 1002.7 988.9 YEAR-DAY 98-13 98- 8 1-25 4-17 4-13 99-25 97-16 94- 1 0- 1 98- 1 94-26 94- 4 97-16 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 918.3 916.7 914.9 914.2 913.3 909.7 908.2 910.0 913.6 918.1 919.3 919.5 914.6 MAX. QFE PRESSURE IN HPA 929.8 929.6 929.3 926.5 922.8 919.6 916.5 918.8 924.1 926.4 931.8 931.7 931.8 YEAR-DAY 99- 2 98-23 2-11 5- 6 3- 2 93-23 0-31 92-31 94-23 90-16 87-30 87- 1 87-30 MIN. QFE PRESSURE IN HPA 905.4 904.8 902.4 904.6 902.3 900.2 900.6 901.6 904.0 909.0 906.6 900.8 900.2 YEAR-DAY 98-13 98- 8 87-14 92-18 4-13 99-25 95-16 94- 2 0- 1 96-27 93-11 88-27 99-25 MEAN QNH PRESSURE IN HPA 1019.6 1017.9 1015.9 1015.1 1014.1 1010.2 1008.6 1010.5 1014.5 1019.4 1020.7 1020.9 1015.6 MAX. QNH PRESSURE IN HPA 1032.1 1031.9 1031.6 1028.5 1024.5 1021.0 1017.7 1020.2 1025.9 1028.4 1034.3 1034.2 1034.3 YEAR-DAY 99- 2 98-23 2-11 5- 6 3- 2 93-23 0-31 92-31 94-23 90-16 87-30 87- 1 87-30 MIN. QNH PRESSURE IN HPA 1005.6 1004.9 1002.3 1004.7 1002.2 999.9 1000.3 1001.4 1004.0 1009.5 1006.9 1000.6 999.9 YEAR-DAY 98-13 98- 8 87-14 92-18 4-13 99-25 95-16 94- 2 0- 1 96-27 93-11 88-27 99-25 MEAN QFF PRESSURE IN HPA 1022.1 1019.5 1015.5 1012.2 1009.2 1003.2 1000.7 1003.2 1009.2 1016.6 1020.7 1022.9 1012.9 MAX. QFF PRESSURE IN HPA 1035.7 1036.1 1034.3 1028.7 1022.0 1015.4 1010.5 1015.4 1023.5 1028.3 1038.0 1037.9 1038.0 YEAR-DAY 92-10 91-15 92-12 5- 6 3- 2 93-23 87-29 92-31 94-23 87-29 87-30 87- 1 87-30 MIN. QFF PRESSURE IN HPA 1007.1 1003.3 999.8 1001.1 996.9 992.4 991.5 993.5 997.3 1005.2 1004.8 1003.5 991.5 YEAR-DAY 97-16 98- 8 1-25 92-18 4-13 99-25 95-16 94- 2 0- 1 98- 1 93-11 88-27 95-16 ======================================================================================================================= 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 CLIMATOLOGICAL NORMALS FOR THE PERIOD 1986-2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 919.5 917.9 915.9 915.0 913.8 910.1 908.9 910.8 914.6 919.3 920.5 920.7 915.6 MAX. QFE PRESSURE IN HPA 931.8 931.1 929.8 929.0 923.7 919.5 917.0 920.0 925.5 928.1 933.0 932.6 933.0 YEAR-DAY 99- 2 98-23 2-11 94- 5 3- 2 93-23 0-30 92-31 94-23 90-19 87-30 87- 1 87-30 MIN. QFE PRESSURE IN HPA 905.9 904.8 903.7 905.0 901.7 900.4 900.9 902.8 905.4 910.0 907.0 901.3 900.4 YEAR-DAY 98-13 1-21 1-25 2- 4 4-13 99-25 95-16 94- 2 0- 1 96-27 1-18 88-27 99-25 MEAN QNH PRESSURE IN HPA 1021.0 1019.2 1017.0 1016.0 1014.8 1010.7 1009.3 1011.5 1015.6 1020.7 1022.0 1022.3 1016.7 MAX. QNH PRESSURE IN HPA 1034.3 1033.5 1032.1 1031.3 1025.5 1020.9 1018.2 1021.5 1027.5 1030.3 1035.6 1035.2 1035.6 YEAR-DAY 99- 2 98-23 2-11 94- 5 3- 2 93-23 0-30 92-31 94-23 90-19 87-30 87- 1 87-30 MIN. QNH PRESSURE IN HPA 1006.1 1004.9 1003.7 1005.1 1001.5 1000.1 1000.7 1002.7 1005.6 1010.6 1007.3 1001.1 1000.1 YEAR-DAY 98-13 1-21 1-25 2- 4 4-13 99-25 95-16 94- 2 0- 1 96-27 1-18 88-27 99-25 MEAN QFF PRESSURE IN HPA 1023.5 1020.7 1016.3 1012.7 1009.6 1003.4 1001.1 1003.6 1009.7 1017.4 1021.7 1024.2 1013.7 MAX. QFF PRESSURE IN HPA 1037.1 1038.1 1035.6 1031.1 1023.2 1015.1 1010.2 1016.3 1023.8 1029.2 1039.3 1039.2 1039.3 YEAR-DAY 92-10 89- 4 92-12 94- 5 3- 2 93-23 0-31 92-31 94-23 90-19 87-30 90-28 87-30 MIN. QFF PRESSURE IN HPA 1009.2 1004.8 1000.6 1002.4 995.1 991.7 991.5 993.8 997.9 1006.7 1004.9 1004.3 991.5 YEAR-DAY 98-13 1-21 1-25 90-29 4-13 99-25 95-16 94- 2 0- 1 96-27 1-18 88-27 95-16 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 918.4 916.8 914.7 913.6 912.4 908.6 907.5 909.3 913.0 917.6 919.0 919.4 914.2 MAX. QFE PRESSURE IN HPA 930.8 930.1 927.8 928.0 922.4 917.5 915.7 918.0 923.6 926.3 932.4 931.0 932.4 YEAR-DAY 99- 2 91-15 92-12 94- 5 3- 2 93-23 0-30 92-31 94-23 90-19 87-30 87- 1 87-30 MIN. QFE PRESSURE IN HPA 905.9 902.6 902.4 904.3 899.5 898.9 899.4 901.1 903.8 907.8 905.6 902.1 898.9 YEAR-DAY 98-13 1-21 89-29 2- 3 4-13 99-25 95-16 94- 2 0- 1 96-27 1-18 88-27 99-25 MEAN QNH PRESSURE IN HPA 1019.7 1018.0 1015.7 1014.5 1013.2 1009.1 1007.8 1009.8 1013.8 1018.9 1020.4 1020.8 1015.1 MAX. QNH PRESSURE IN HPA 1033.2 1032.5 1030.0 1030.2 1024.1 1018.7 1016.8 1019.3 1025.4 1028.3 1035.0 1033.4 1035.0 YEAR-DAY 99- 2 91-15 92-12 94- 5 3- 2 93-23 0-30 92-31 94-23 90-19 87-30 87- 1 87-30 MIN. QNH PRESSURE IN HPA 1006.1 1002.5 1002.3 1004.4 999.1 998.5 999.0 1000.9 1003.8 1008.2 1005.8 1002.0 998.5 YEAR-DAY 98-13 1-21 89-29 2- 3 4-13 99-25 95-16 94- 2 0- 1 96-27 1-18 88-27 99-25 MEAN QFF PRESSURE IN HPA 1021.6 1018.9 1014.5 1011.0 1007.9 1001.7 999.5 1001.8 1007.7 1015.1 1019.4 1022.0 1011.7 MAX. QFF PRESSURE IN HPA 1035.5 1036.3 1034.1 1030.0 1022.3 1012.9 1008.8 1014.0 1021.6 1028.1 1037.3 1036.6 1037.3 YEAR-DAY 99- 2 89- 4 92-12 94- 5 92- 2 93-22 0-30 92-31 94-23 87-28 87-30 90-28 87-30 MIN. QFF PRESSURE IN HPA 1007.6 1001.9 999.4 999.2 993.3 990.8 989.7 991.7 996.2 1003.3 1003.5 1003.9 989.7 YEAR-DAY 97-17 1-21 1-25 1-26 4-13 99-25 95-16 94- 2 0- 1 98- 1 1-18 88-27 95-16 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 917.0 915.0 912.8 911.8 910.6 906.5 905.3 907.0 910.8 915.8 917.6 918.1 912.4 MAX. QFE PRESSURE IN HPA 929.0 928.5 926.1 925.0 920.4 915.6 914.0 916.2 922.5 925.9 931.1 928.9 931.1 YEAR-DAY 99- 2 91-15 92-12 94- 5 3- 2 93-22 0-30 92-31 94-23 87-28 87-30 87- 1 87-30 MIN. QFE PRESSURE IN HPA 905.2 900.2 900.6 901.2 898.6 898.0 897.0 899.4 902.2 906.6 902.9 903.0 897.0 YEAR-DAY 0-21 1-21 97-29 2- 3 4-13 99-25 95-16 94- 2 0- 1 96-27 4-23 88-26 95-16 MEAN QNH PRESSURE IN HPA 1018.2 1016.0 1013.6 1012.5 1011.2 1006.8 1005.5 1007.3 1011.5 1016.9 1018.8 1019.4 1013.1 MAX. QNH PRESSURE IN HPA 1031.3 1030.7 1028.1 1026.9 1021.9 1016.7 1014.9 1017.3 1024.2 1027.9 1033.5 1031.2 1033.5 YEAR-DAY 99- 2 91-15 92-12 94- 5 3- 2 93-22 0-30 92-31 94-23 87-28 87-30 87- 1 87-30 MIN. QNH PRESSURE I