STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 8.5 10.7 14.2 18.8 24.5 32.6 35.7 35.0 32.1 24.7 16.4 13.0 22.2 MINIMUN AIR TEMPERATURE (C) 3.9 5.9 7.8 11.4 15.5 19.8 25.2 23.7 20.7 15.2 10.4 6.5 13.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 9 30 31 16 1 0 0 87 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 2 0 0 0 0 0 0 0 0 0 0 0 2 TEMPERATURE RECORDS LOWEST(C) -0.2 0.6 1.6 7.0 9.8 16.4 20.6 21.0 15.0 13.4 5.0 3.8 -0.2 DAY 18 8 13 14 8 5 8 19 29 7 30 5 MAXIMUM AIR TEMPERATURE (C) 12.0 14.0 17.6 22.7 28.7 37.8 40.5 40.2 37.2 29.3 20.3 17.7 26.5 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 2 14 30 31 31 30 16 0 0 154 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 18.0 21.0 26.0 30.4 36.0 41.8 43.2 42.4 41.2 34.4 25.0 20.0 43.2 DAY 29 28 31 18 31 30 16 16 1 1 9 7 DIF. BETWEEN (MAX.-MIN.) (C) 8.1 8.1 9.8 11.3 13.2 18.0 15.3 16.5 16.5 14.1 9.9 11.2 12.7 MEAN DAILY TEMP. (MDT) (C) 8.0 9.9 12.7 17.1 22.1 28.8 32.9 32.0 28.9 22.2 15.3 12.1 20.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.3 66.9 234.3 368.4 340.9 238.4 47.8 0.0 0.0 1297.0 HEATING DEG. DAYS(BASE 18 0C) 311.5 225.9 163.5 44.4 3.0 0.0 0.0 0.0 0.0 0.1 84.4 183.5 1016.3 DEWPOINT (MEAN C) 3.0 4.4 5.3 10.1 12.1 11.1 13.7 10.4 6.3 4.2 6.5 4.7 7.7 MIXING RATIO (G/KG) 5.36 5.92 6.31 8.58 10.10 9.57 12.18 9.57 6.93 5.98 6.89 5.95 7.78 VAPOUR PRESSURE (HPA) 7.88 8.69 9.24 12.52 14.65 13.81 17.43 13.78 10.07 8.77 10.10 8.76 11.31 SATURATION DEF. (HPA) 3.52 4.52 7.45 9.95 17.62 37.68 42.72 44.25 39.45 23.56 9.02 6.57 20.53 RELATIVE HUMIDITY (MEAN %) 72 68 59 60 52 29 30 26 23 31 55 61 47 RELATIVE HUMIDITY (MAX. %) 89 87 81 80 75 49 42 41 39 48 74 81 66 RELATIVE HUMIDITY (MIN. %) 54 51 43 44 36 20 23 17 13 20 38 41 33 RELATIVE HUMIDITY (MEAN% 03UTC) 87 83 76 76 72 46 41 40 38 43 71 78 63 RELATIVE HUMIDITY (MEAN% 09UTC) 64 60 51 52 42 25 27 21 17 28 49 47 40 RELATIVE HUMIDITY (MEAN% 15UTC) 69 70 59 61 52 21 28 19 16 26 55 62 45 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 223.6 246.3 120.0 152.0 42.0 0.0 4.0 0.0 0.0 16.0 125.3 45.3 974.5 DAYS WITH PRECIPITATION >=10 5 8 5 5 2 0 0 0 0 0 2 2 29 DAYS WITH PRECIPITATION >= 5 7 9 8 8 3 0 0 0 0 2 4 2 43 DAYS WITH PRECIPITATION >= 1 11 11 14 11 6 0 2 0 0 3 10 3 71 DAYS WITH PRECIPITATION 13 13 14 11 8 0 2 0 0 5 11 5 82 GREATEST DAILY PRECIPITATION 69.0 65.0 29.0 38.0 17.0 0.0 2.0 0.0 0.0 8.0 84.0 26.0 84.0 DAY 8 3 21 26 14 ** 25 ** ** 29 12 15 DAY WITH THUNDER STORM 0 5 7 5 3 0 3 0 0 1 2 1 27 DAYS WITH SNOW OR SLEET 0 1 0 0 0 0 0 0 0 0 0 0 1 DAYS WITH DUST 0 0 8 3 15 6 6 3 1 10 23 3 78 WIND DIRECTION (PREVAILING) 90 180 270 90 315 270 90 270 225 270 225 225 270 PREVAILING WIND SPEED(KNOTS) 7.4 14.8 5.7 6.3 4.5 7.0 12.4 7.2 6.5 5.5 4.9 5.8 6.6 PREVAILING WIND PERCENT 8.4 7.9 13.5 10.0 12.9 24.7 22.6 27.7 32.2 26.0 33.3 6.5 13.1 CALMS PERCENT OF WIND 74.8 73.6 51.0 62.7 51.0 38.0 31.6 36.8 31.5 31.8 16.0 81.3 48.4 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 149 154 144 155 1817 VECTOR WIND DIRECTION (MEAN) 177 198 200 241 45 293 68 241 249 267 205 257 234 VECTOR WIND MAGNITUDE(KNOTS) 0.6 1.3 1.4 0.1 0.3 1.7 1.2 1.6 2.6 1.9 2.3 0.4 0.8 WIND STEADINESES (MEAN %) 31.6 50.0 33.3 4.2 9.7 37.8 18.7 31.4 57.8 50.0 57.5 40.0 22.2 WIND SPEED (MEAN KNOTS) 1.9 2.6 4.2 2.4 3.1 4.5 6.4 5.1 4.5 3.8 4.0 1.0 3.6 FASTEST WIND DIRECTION 170 180 160 290 180 90 90 90 90 80 180 90 180 FASTEST WIND SPEED (KNOTS) 17 29 27 17 19 27 29 23 16 19 19 12 29 DAY 8 21 8 6 2 23 17 3 16 8 12 8 DAYS WITH SKY CLEAR (0-2)/8 12 10 15 10 13 30 23 27 28 20 11 16 215 DAYS WITH P.CLOUDY (3-6)/8 8 7 5 9 8 0 8 4 2 7 10 10 78 DAYS WITH CLOUDY (7-8)/8 11 11 11 11 10 0 0 0 0 4 9 5 72 DAYS WITH VISIBILITY =< 2 KM 6 3 2 1 14 6 2 0 0 7 1 0 42 DURATION OF SUNSHINE HOURS 161.5 140.8 194.3 210.0 218.1 372.3 349.6 ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 923.9 922.9 921.3 921.1 918.5 913.6 911.0 913.2 915.5 922.8 923.5 925.0 919.4 MAX. QFE PRESSURE IN HPA 930.7 930.3 925.8 925.0 923.0 917.0 915.0 917.2 920.2 928.0 928.4 930.8 930.8 DAY-HOUR 27- 6 7-15 20-15 17- 6 3- 6 5- 6 25- 6 8- 6 30- 6 17- 6 2- 6 26- 6 MIN. QFE PRESSURE IN HPA 914.6 914.4 915.0 914.8 911.6 909.2 906.4 909.3 911.8 917.4 917.2 920.0 906.4 DAY-HOUR 8-12 3-12 5-12 26-15 30-15 25-15 10-15 3-15 7-12 3-12 12-12 4-12 MEAN QNH PRESSURE IN HPA 1012.4 1011.3 1009.6 1009.3 1006.6 1001.3 998.5 1000.9 1003.3 1011.2 1011.9 1013.5 1007.5 MAX. QNH PRESSURE IN HPA 1019.7 1019.3 1014.4 1013.6 1011.4 1004.9 1002.8 1005.2 1008.4 1016.8 1017.2 1019.8 1019.8 DAY-HOUR 27- 6 7-15 20-15 17- 6 3- 6 5- 6 25- 6 8- 6 30- 6 17- 6 2- 6 26- 6 MIN. QNH PRESSURE IN HPA 1002.4 1002.1 1002.8 1002.6 999.1 996.5 993.5 996.7 999.3 1005.4 1005.2 1008.2 993.5 DAY-HOUR 8-12 3-12 5-12 26-15 30-15 25-15 10-15 3-15 7-12 3-12 12-12 4-12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 923.8 922.9 921.4 921.1 918.3 913.8 911.2 913.5 915.6 922.9 923.6 924.7 919.4 MAX. QFE PRESSURE IN HPA 929.8 930.0 924.7 924.0 921.0 916.0 914.8 917.0 919.0 927.0 926.6 929.8 930.0 DAY 27 8 18 17 3 2 26 8 24 17 26 26 MIN. QFE PRESSURE IN HPA 915.3 915.0 917.0 917.3 912.4 909.6 907.4 910.0 912.4 919.0 919.0 921.0 907.4 DAY 8 3 6 27 31 26 10 13 2 4 11 4 MEAN QNH PRESSURE IN HPA 1012.3 1011.3 1009.7 1009.3 1006.3 1001.5 998.7 1001.1 1003.5 1011.3 1012.0 1013.2 1007.5 MAX. QNH PRESSURE IN HPA 1018.7 1019.0 1013.2 1012.5 1009.3 1003.9 1002.6 1004.9 1007.1 1015.7 1015.3 1018.7 1019.0 DAY 27 8 18 17 3 2 26 8 24 17 26 26 MIN. QNH PRESSURE IN HPA 1003.1 1002.8 1004.9 1005.3 1000.0 997.0 994.6 997.4 1000.0 1007.1 1007.1 1009.3 994.6 DAY 8 3 6 27 31 26 10 13 2 4 11 4 MEAN QFF PRESSURE IN HPA 1013.0 1011.4 1008.8 1007.0 1002.4 995.3 991.4 994.2 997.5 1007.6 1010.6 1012.9 1004.3 MAX. QFF PRESSURE IN HPA 1019.6 1020.8 1012.7 1010.5 1006.5 998.9 995.7 997.8 1002.2 1012.5 1015.0 1018.3 1020.8 DAY 27 8 23 9 14 5 25 8 30 17 30 26 MIN. QFF PRESSURE IN HPA 1001.8 1001.3 1003.4 1003.0 994.9 991.0 987.5 989.9 992.9 1002.2 1006.2 1009.2 987.5 DAY 8 3 6 27 31 26 10 3 2 4 10 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 925.0 923.8 922.2 922.0 919.4 914.3 911.8 914.2 916.5 923.9 924.5 926.0 920.3 MAX. QFE PRESSURE IN HPA 930.7 930.1 925.1 925.0 923.0 917.0 915.0 917.2 920.2 928.0 928.4 930.8 930.8 DAY 27 7 29 17 3 5 25 8 30 17 2 26 MIN. QFE PRESSURE IN HPA 916.0 915.9 916.0 918.0 913.0 910.2 907.8 911.0 913.0 920.0 920.0 922.6 907.8 DAY 8 3 21 26 31 26 10 13 7 3 11 4 MEAN QNH PRESSURE IN HPA 1013.6 1012.3 1010.5 1010.4 1007.5 1002.0 999.4 1001.9 1004.5 1012.4 1013.0 1014.6 1008.5 MAX. QNH PRESSURE IN HPA 1019.7 1019.1 1013.7 1013.6 1011.4 1004.9 1002.8 1005.2 1008.4 1016.8 1017.2 1019.8 1019.8 DAY 27 7 29 17 3 5 25 8 30 17 2 26 MIN. QNH PRESSURE IN HPA 1003.9 1003.8 1003.9 1006.0 1000.6 997.6 995.0 998.5 1000.6 1008.2 1008.2 1011.0 995.0 DAY 8 3 21 26 31 26 10 13 7 3 11 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 924.3 923.4 921.8 921.6 919.2 914.0 911.5 913.7 915.9 923.1 923.6 925.4 919.8 MAX. QFE PRESSURE IN HPA 929.7 930.2 925.6 924.4 922.4 916.8 914.8 916.8 920.0 926.8 927.4 930.4 930.4 DAY 27 7 20 17 14 5 25 18 30 17 2 26 MIN. QFE PRESSURE IN HPA 915.5 915.7 917.6 917.7 912.8 910.0 907.4 910.4 912.8 918.8 918.0 920.8 907.4 DAY 8 3 12 27 31 26 10 13 7 3 12 4 MEAN QNH PRESSURE IN HPA 1012.8 1011.8 1010.1 1009.9 1007.3 1001.7 999.0 1001.4 1003.8 1011.5 1012.0 1014.0 1007.9 MAX. QNH PRESSURE IN HPA 1018.6 1019.2 1014.2 1012.9 1010.8 1004.7 1002.6 1004.7 1008.2 1015.5 1016.2 1019.4 1019.4 DAY 27 7 20 17 14 5 25 18 30 17 2 26 MIN. QNH PRESSURE IN HPA 1003.3 1003.5 1005.6 1005.7 1000.4 997.4 994.6 997.8 1000.4 1006.9 1006.0 1009.0 994.6 DAY 8 3 12 27 31 26 10 13 7 3 12 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 923.1 922.0 920.5 920.4 918.2 913.1 910.4 912.5 914.7 921.9 922.6 924.3 918.6 MAX. QFE PRESSURE IN HPA 927.5 930.0 925.2 923.0 921.6 915.8 914.0 916.0 919.4 925.8 926.4 929.0 930.0 DAY 26 7 20 16 14 28 25 18 30 17 1 26 MIN. QFE PRESSURE IN HPA 914.6 914.4 915.0 915.3 912.0 909.4 906.6 909.8 911.8 917.4 917.2 920.0 906.6 DAY 8 3 5 26 30 26 10 13 7 3 12 4 MEAN QNH PRESSURE IN HPA 1011.5 1010.3 1008.7 1008.6 1006.2 1000.7 997.9 1000.1 1002.4 1010.3 1011.0 1012.8 1006.7 MAX. QNH PRESSURE IN HPA 1016.3 1019.0 1013.8 1011.4 1009.9 1003.7 1001.7 1003.9 1007.5 1014.4 1015.1 1017.9 1019.0 DAY 26 7 20 16 14 28 25 18 30 17 1 26 MIN. QNH PRESSURE IN HPA 1002.4 1002.1 1002.8 1003.1 999.6 996.8 993.7 997.2 999.3 1005.4 1005.2 1008.2 993.7 DAY 8 3 5 26 30 26 10 13 7 3 12 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 923.5 922.3 920.7 920.2 917.8 912.8 910.3 912.3 914.8 922.2 923.2 924.6 918.7 MAX. QFE PRESSURE IN HPA 928.0 930.3 925.8 923.0 921.4 915.4 914.4 916.0 919.4 925.8 926.8 928.8 930.3 DAY 26 7 20 16 14 5 25 18 30 17 1 26 MIN. QFE PRESSURE IN HPA 915.2 916.0 915.0 914.8 911.6 909.2 906.4 909.3 912.0 918.0 919.6 920.0 906.4 DAY 8 4 5 26 30 25 10 3 1 3 15 4 MEAN QNH PRESSURE IN HPA 1011.9 1010.7 1008.9 1008.4 1005.8 1000.5 997.7 999.9 1002.6 1010.5 1011.6 1013.1 1006.8 MAX. QNH PRESSURE IN HPA 1016.8 1019.3 1014.4 1011.4 1009.7 1003.2 1002.1 1003.9 1007.5 1014.4 1015.5 1017.7 1019.3 DAY 26 7 20 16 14 5 25 18 30 17 1 26 MIN. QNH PRESSURE IN HPA 1003.0 1003.9 1002.8 1002.6 999.1 996.5 993.5 996.7 999.6 1006.0 1007.7 1008.2 993.5 DAY 8 4 5 26 30 25 10 3 1 3 15 4 MEAN QFF PRESSURE IN HPA 1012.7 1010.7 1008.0 1006.0 1001.7 994.3 990.3 993.0 996.8 1006.8 1010.2 1012.7 1003.6 MAX. QFF PRESSURE IN HPA 1017.9 1021.0 1013.7 1008.7 1006.4 998.5 995.6 997.7 1003.1 1011.1 1014.1 1017.1 1021.0 DAY 26 7 20 5 14 5 25 18 30 30 30 26 MIN. QFF PRESSURE IN HPA 1001.2 1002.6 1001.1 999.9 992.8 990.3 986.7 987.5 992.3 1001.4 1005.7 1008.4 986.7 DAY 8 2 5 26 30 25 10 3 1 5 11 4 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 11.1 11.0 14.5 21.8 26.7 32.8 34.6 34.5 30.8 24.4 16.3 9.3 22.3 MINIMUN AIR TEMPERATURE (C) 6.0 3.8 6.9 12.6 15.7 20.4 24.0 22.9 20.7 16.0 11.5 4.0 13.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 3 10 30 24 13 0 0 0 80 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 0 0 0 0 0 0 0 0 0 0 0 3 3 TEMPERATURE RECORDS LOWEST(C) 1.2 0.8 3.8 7.4 9.8 16.8 18.8 19.4 16.4 13.4 6.2 -1.0 -1.0 DAY 27 6 2 5 7 6 1 25 25 14 27 8 MAXIMUM AIR TEMPERATURE (C) 15.0 15.3 18.7 26.3 31.4 37.7 40.2 41.0 35.5 29.0 20.0 13.3 27.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 8 19 30 31 31 30 15 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) 19.2 20.0 23.0 33.6 38.4 40.4 42.4 44.8 39.4 32.4 27.0 17.4 44.8 DAY 2 27 31 29 31 8 12 9 1 6 2 2 DIF. BETWEEN (MAX.-MIN.) (C) 9.0 11.5 11.8 13.7 15.7 17.3 16.2 18.1 14.8 13.0 8.5 9.3 13.3 MEAN DAILY TEMP. (MDT) (C) 10.5 9.5 12.8 19.4 23.5 29.1 32.1 31.9 28.1 22.5 15.8 8.7 20.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 21.4 92.5 241.7 343.8 339.0 213.2 52.1 0.3 0.0 1304.0 HEATING DEG. DAYS(BASE 18 0C) 232.4 237.3 161.0 18.4 0.6 0.0 0.0 0.0 0.0 0.0 77.3 289.5 1016.5 DEWPOINT (MEAN C) 3.9 1.2 6.0 9.4 5.8 2.4 8.4 7.4 3.3 10.8 9.3 2.5 5.9 MIXING RATIO (G/KG) 5.70 4.68 6.53 8.32 6.64 5.24 7.92 7.54 5.69 8.97 8.16 5.25 6.72 VAPOUR PRESSURE (HPA) 8.38 6.87 9.56 12.13 9.68 7.60 11.41 10.88 8.31 13.10 11.94 7.73 9.80 SATURATION DEF. (HPA) 5.22 6.64 7.50 15.21 27.51 44.41 45.91 46.41 37.58 18.54 7.12 4.38 22.20 RELATIVE HUMIDITY (MEAN %) 65 55 60 49 32 17 23 22 20 45 66 66 43 RELATIVE HUMIDITY (MAX. %) 84 77 82 74 58 35 40 41 34 65 83 85 63 RELATIVE HUMIDITY (MIN. %) 47 36 43 33 18 9 13 11 12 33 52 48 30 RELATIVE HUMIDITY (MEAN% 03UTC) 77 73 79 71 55 34 39 38 33 64 81 83 61 RELATIVE HUMIDITY (MEAN% 09UTC) 56 49 52 41 26 12 18 16 15 38 59 56 37 RELATIVE HUMIDITY (MEAN% 15UTC) 65 51 58 45 22 10 13 12 17 40 68 67 39 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 100.8 21.0 96.0 35.4 27.8 0.0 0.0 0.0 0.0 13.4 326.4 70.0 690.8 DAYS WITH PRECIPITATION >=10 4 1 2 2 1 0 0 0 0 1 11 3 25 DAYS WITH PRECIPITATION >= 5 7 1 3 3 2 0 0 0 0 1 11 6 34 DAYS WITH PRECIPITATION >= 1 8 2 10 4 3 0 0 0 0 3 11 9 50 DAYS WITH PRECIPITATION 10 4 10 4 4 0 0 0 0 4 12 11 59 GREATEST DAILY PRECIPITATION 26.0 17.0 52.0 13.0 18.0 0.0 0.0 0.0 0.0 10.0 70.0 16.0 70.0 DAY 5 1 12 1 4 ** ** ** ** 19 17 16 DAY WITH THUNDER STORM 4 1 1 1 2 0 0 0 0 1 6 0 16 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 1 1 DAYS WITH DUST 0 0 0 2 2 2 5 2 2 0 0 0 15 WIND DIRECTION (PREVAILING) 90 90 270 90 90 225 225 225 90 90 90 90 225 PREVAILING WIND SPEED(KNOTS) 7.3 7.6 4.7 6.9 6.7 7.3 7.2 7.6 10.3 6.7 5.7 4.5 6.4 PREVAILING WIND PERCENT 22.1 20.1 14.8 11.3 17.4 26.0 43.2 44.5 23.3 25.8 29.3 21.3 21.0 CALMS PERCENT OF WIND 35.1 33.6 38.7 59.3 24.5 18.7 18.7 25.2 24.0 21.9 26.0 31.6 29.7 NO. OF WIND OBSERVATION 154 134 155 150 155 150 155 155 150 155 150 155 1818 VECTOR WIND DIRECTION (MEAN) 71 191 169 76 3 261 249 234 100 208 124 191 218 VECTOR WIND MAGNITUDE(KNOTS) 1.3 1.2 0.6 0.2 0.1 1.7 3.4 4.2 0.5 0.6 1.5 0.5 0.8 WIND STEADINESES (MEAN %) 38.2 27.9 16.2 8.7 2.1 29.8 61.8 79.2 7.9 12.2 38.5 15.2 18.2 WIND SPEED (MEAN KNOTS) 3.4 4.3 3.7 2.3 4.8 5.7 5.5 5.3 6.3 4.9 3.9 3.3 4.4 FASTEST WIND DIRECTION 220 70 80 90 70 70 70 240 90 90 70 60 220 FASTEST WIND SPEED (KNOTS) 29 17 19 16 14 17 17 14 17 17 16 19 29 DAY 18 19 7 5 5 8 2 25 20 16 6 26 DAYS WITH SKY CLEAR (0-2)/8 14 16 13 16 26 28 31 30 23 19 11 16 243 DAYS WITH P.CLOUDY (3-6)/8 9 10 12 10 4 2 0 1 6 9 8 9 80 DAYS WITH CLOUDY (7-8)/8 8 2 6 4 1 0 0 0 1 3 11 6 42 DAYS WITH VISIBILITY =< 2 KM 0 0 0 0 0 0 0 0 0 0 0 2 2 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 923.0 921.1 921.2 919.8 917.9 911.2 908.6 910.0 917.0 921.6 922.8 924.5 918.2 MAX. QFE PRESSURE IN HPA 929.8 927.0 926.6 926.0 923.4 914.8 911.0 914.6 924.4 927.0 927.4 928.2 929.8 DAY-HOUR 28- 6 26- 6 18- 6 16- 6 8- 6 1- 6 25- 6 15- 9 23- 6 31- 6 2- 6 21- 6 MIN. QFE PRESSURE IN HPA 914.0 914.2 912.0 914.0 912.8 908.6 906.0 906.2 909.6 917.0 914.8 913.0 906.0 DAY-HOUR 16-12 12- 3 11-15 26-15 27-15 27-15 30-15 1-15 1-15 5-12 25-15 3-12 MEAN QNH PRESSURE IN HPA 1011.4 1009.3 1009.5 1007.9 1005.9 998.7 995.9 997.5 1004.9 1009.9 1011.1 1013.0 1006.3 MAX. QNH PRESSURE IN HPA 1018.7 1015.7 1015.3 1014.6 1011.8 1002.6 998.5 1002.4 1012.9 1015.7 1016.2 1017.0 1018.7 DAY-HOUR 28- 6 26- 6 18- 6 16- 6 8- 6 1- 6 25- 6 15- 9 23- 6 31- 6 2- 6 21- 6 MIN. QNH PRESSURE IN HPA 1001.7 1001.9 999.6 1001.7 1000.4 995.9 993.1 993.3 997.0 1004.9 1002.6 1000.6 993.1 DAY-HOUR 16-12 12- 3 11-15 26-15 27-15 27-15 30-15 1-15 1-15 5-12 25-15 3-12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 922.9 920.9 921.2 919.7 917.8 911.3 908.7 910.1 917.1 921.7 922.7 924.3 918.2 MAX. QFE PRESSURE IN HPA 927.8 926.0 925.8 924.0 922.4 914.0 910.0 913.0 923.2 925.4 926.0 927.2 927.8 DAY 28 26 18 16 8 1 4 8 24 20 2 21 MIN. QFE PRESSURE IN HPA 916.8 914.2 914.2 916.0 914.6 909.2 907.0 907.0 909.8 918.0 917.8 916.0 907.0 DAY 16 12 12 4 24 23 22 1 1 4 17 4 MEAN QNH PRESSURE IN HPA 1011.3 1009.2 1009.4 1007.9 1005.8 998.8 996.0 997.5 1005.1 1010.0 1011.1 1012.8 1006.2 MAX. QNH PRESSURE IN HPA 1016.6 1014.6 1014.4 1012.5 1010.8 1001.7 997.4 1000.6 1011.6 1014.0 1014.6 1015.9 1016.6 DAY 28 26 18 16 8 1 4 8 24 20 2 21 MIN. QNH PRESSURE IN HPA 1004.7 1001.9 1001.9 1003.9 1002.4 996.5 994.2 994.2 997.2 1006.0 1005.8 1003.9 994.2 DAY 16 12 12 4 24 23 22 1 1 4 17 4 MEAN QFF PRESSURE IN HPA 1011.4 1009.4 1008.5 1004.7 1001.3 992.5 989.1 990.8 999.4 1006.0 1009.4 1013.4 1003.0 MAX. QFF PRESSURE IN HPA 1018.2 1015.2 1013.9 1009.6 1007.9 995.8 990.9 993.5 1006.7 1010.9 1013.4 1018.3 1018.3 DAY 28 26 18 17 8 5 1 29 25 20 10 7 MIN. QFF PRESSURE IN HPA 1003.8 1000.4 1001.3 1001.4 996.3 989.7 987.2 986.9 991.2 1001.5 1004.1 1002.9 986.9 DAY 16 1 12 30 27 12 27 10 1 6 17 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 923.9 922.0 922.1 920.8 918.8 911.8 909.2 910.8 918.1 922.8 923.9 925.5 919.1 MAX. QFE PRESSURE IN HPA 929.8 927.0 926.6 926.0 923.4 914.8 911.0 913.8 924.4 927.0 927.4 928.2 929.8 DAY 28 26 18 16 8 1 25 15 23 31 2 21 MIN. QFE PRESSURE IN HPA 916.4 915.2 915.0 917.8 915.2 909.8 907.4 907.2 910.4 919.0 918.0 917.4 907.2 DAY 16 12 12 4 24 23 30 10 1 6 17 4 MEAN QNH PRESSURE IN HPA 1012.4 1010.3 1010.4 1009.1 1006.9 999.4 996.5 998.3 1006.1 1011.2 1012.4 1014.1 1007.3 MAX. QNH PRESSURE IN HPA 1018.7 1015.7 1015.3 1014.6 1011.8 1002.6 998.5 1001.5 1012.9 1015.7 1016.2 1017.0 1018.7 DAY 28 26 18 16 8 1 25 15 23 31 2 21 MIN. QNH PRESSURE IN HPA 1004.3 1003.0 1002.8 1005.8 1003.0 997.2 994.6 994.4 997.8 1007.1 1006.0 1005.4 994.4 DAY 16 12 12 4 24 23 30 10 1 6 17 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 923.5 921.7 922.0 920.5 918.6 911.7 908.9 910.4 917.5 922.0 923.1 924.9 918.7 MAX. QFE PRESSURE IN HPA 929.4 926.2 925.2 926.0 923.2 914.8 910.4 914.6 923.8 926.0 926.8 927.8 929.4 DAY 28 26 31 16 4 1 24 15 24 31 2 21 MIN. QFE PRESSURE IN HPA 915.0 916.0 914.2 915.4 915.0 909.8 907.0 907.0 910.2 918.4 918.0 915.0 907.0 DAY 23 12 12 30 27 23 12 10 1 3 17 3 MEAN QNH PRESSURE IN HPA 1012.0 1010.0 1010.3 1008.7 1006.7 999.3 996.3 997.8 1005.5 1010.3 1011.6 1013.5 1006.8 MAX. QNH PRESSURE IN HPA 1018.3 1014.9 1013.8 1014.6 1011.6 1002.6 997.8 1002.4 1012.3 1014.6 1015.5 1016.6 1018.3 DAY 28 26 31 16 4 1 24 15 24 31 2 21 MIN. QNH PRESSURE IN HPA 1002.8 1003.9 1001.9 1003.2 1002.8 997.2 994.2 994.2 997.6 1006.5 1006.0 1002.8 994.2 DAY 23 12 12 30 27 23 12 10 1 3 17 3 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 922.1 920.3 920.6 919.2 917.4 910.8 908.3 909.6 916.3 920.8 922.0 923.9 917.6 MAX. QFE PRESSURE IN HPA 928.0 924.8 924.8 924.5 922.0 913.8 910.0 913.8 922.6 925.4 925.8 927.6 928.0 DAY 28 25 2 16 16 1 6 15 24 31 10 6 MIN. QFE PRESSURE IN HPA 914.0 915.0 913.8 914.8 913.8 909.0 906.2 906.4 909.8 917.0 916.2 913.0 906.2 DAY 16 11 12 30 27 23 30 3 1 5 25 3 MEAN QNH PRESSURE IN HPA 1010.5 1008.5 1008.8 1007.3 1005.4 998.3 995.6 997.0 1004.1 1009.0 1010.3 1012.4 1005.6 MAX. QNH PRESSURE IN HPA 1016.8 1013.4 1013.4 1013.0 1010.3 1001.5 997.4 1001.5 1011.0 1014.0 1014.4 1016.4 1016.8 DAY 28 25 2 16 16 1 6 15 24 31 10 6 MIN. QNH PRESSURE IN HPA 1001.7 1002.8 1001.5 1002.6 1001.5 996.3 993.3 993.5 997.2 1004.9 1004.1 1000.6 993.3 DAY 16 11 12 30 27 23 30 3 1 5 25 3 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 922.5 920.6 920.4 918.8 916.8 910.3 908.0 909.4 916.1 920.9 922.1 924.0 917.5 MAX. QFE PRESSURE IN HPA 928.0 925.1 924.4 923.5 921.0 912.4 909.8 913.0 922.6 925.8 926.4 927.4 928.0 DAY 28 25 18 16 8 1 3 15 24 31 10 6 MIN. QFE PRESSURE IN HPA 916.0 915.0 912.0 914.0 912.8 908.6 906.0 906.2 909.6 917.0 914.8 913.4 906.0 DAY 23 11 11 26 27 27 30 1 1 5 25 3 MEAN QNH PRESSURE IN HPA 1010.9 1008.8 1008.7 1006.9 1004.8 997.7 995.2 996.7 1004.0 1009.1 1010.4 1012.5 1005.5 MAX. QNH PRESSURE IN HPA 1016.8 1013.7 1012.9 1011.9 1009.3 1000.0 997.2 1000.6 1011.0 1014.4 1015.1 1016.2 1016.8 DAY 28 25 18 16 8 1 3 15 24 31 10 6 MIN. QNH PRESSURE IN HPA 1003.9 1002.8 999.6 1001.7 1000.4 995.9 993.1 993.3 997.0 1004.9 1002.6 1001.1 993.1 DAY 23 11 11 26 27 27 30 1 1 5 25 3 MEAN QFF PRESSURE IN HPA 1011.0 1009.0 1007.6 1003.7 1000.3 991.6 988.4 990.1 998.4 1005.2 1008.6 1013.1 1002.2 MAX. QFF PRESSURE IN HPA 1018.0 1013.8 1012.6 1009.3 1006.1 994.7 990.5 993.6 1006.0 1011.8 1013.9 1018.3 1018.3 DAY 28 25 1 16 8 5 3 15 24 31 10 6 MIN. QFF PRESSURE IN HPA 1004.1 1003.0 997.5 997.4 994.1 988.6 986.4 986.6 991.0 1000.5 1000.4 999.3 986.4 DAY 23 11 11 26 27 8 30 1 1 5 25 3 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 11.4 11.9 14.7 18.9 27.3 32.4 35.0 36.4 30.5 24.2 17.9 10.5 22.6 MINIMUN AIR TEMPERATURE (C) 5.3 5.9 7.2 10.4 16.6 20.4 23.7 24.0 18.8 12.8 8.4 4.8 13.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 6 14 25 30 6 0 0 0 81 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 0 0 0 0 0 0 0 0 0 0 2 0 2 TEMPERATURE RECORDS LOWEST(C) 1.0 1.4 2.4 4.8 7.8 18.0 19.4 20.4 14.4 9.4 -1.0 0.6 -1.0 DAY 26 11 28 8 10 5 1 23 22 16 29 21 MAXIMUM AIR TEMPERATURE (C) 15.8 15.8 18.8 23.2 31.7 37.3 40.8 42.2 36.4 30.0 23.5 14.6 27.5 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 21 30 31 31 30 14 0 0 157 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 21.0 19.6 22.4 27.6 36.4 42.0 44.4 44.6 42.4 34.2 28.0 18.0 44.6 DAY 7 3 31 30 23 21 20 4 1 3 17 31 DIF. BETWEEN (MAX.-MIN.) (C) 10.5 9.9 11.6 12.8 15.1 16.9 17.1 18.2 17.6 17.2 15.1 9.8 14.3 MEAN DAILY TEMP. (MDT) (C) 10.5 10.8 13.0 16.8 24.2 28.8 32.2 33.1 27.6 21.4 16.0 9.7 20.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 105.4 235.0 348.4 376.1 197.1 35.4 0.5 0.0 1297.9 HEATING DEG. DAYS(BASE 18 0C) 231.6 200.3 155.6 45.2 0.1 0.0 0.0 0.0 0.0 0.0 78.7 256.9 968.4 DEWPOINT (MEAN C) 4.2 5.4 6.6 8.9 10.6 10.0 10.7 6.0 3.2 -0.6 0.1 3.3 5.7 MIXING RATIO (G/KG) 5.69 6.24 6.85 8.03 9.25 8.95 9.41 6.95 5.69 4.23 4.47 5.45 6.77 VAPOUR PRESSURE (HPA) 8.37 9.15 10.02 11.71 13.43 12.93 13.51 10.05 8.29 6.21 6.58 8.02 9.86 SATURATION DEF. (HPA) 5.44 5.09 7.14 10.89 24.45 37.92 45.34 53.35 37.71 25.29 15.31 4.97 22.74 RELATIVE HUMIDITY (MEAN %) 64 68 62 56 39 29 26 18 22 23 35 65 42 RELATIVE HUMIDITY (MAX. %) 86 88 85 80 63 47 46 32 42 45 57 86 63 RELATIVE HUMIDITY (MIN. %) 44 50 46 40 26 19 15 10 11 13 19 47 28 RELATIVE HUMIDITY (MEAN% 03UTC) 83 85 84 78 60 47 45 31 41 44 55 84 61 RELATIVE HUMIDITY (MEAN% 09UTC) 54 57 51 47 32 23 19 13 14 15 26 55 34 RELATIVE HUMIDITY (MEAN% 15UTC) 63 67 59 52 33 22 18 12 14 16 28 63 37 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 54.4 164.2 81.9 71.4 20.4 4.0 0.0 0.0 1.0 0.0 7.0 90.8 495.1 DAYS WITH PRECIPITATION >=10 2 6 3 2 1 0 0 0 0 0 0 3 17 DAYS WITH PRECIPITATION >= 5 4 7 5 5 1 0 0 0 0 0 1 4 27 DAYS WITH PRECIPITATION >= 1 6 8 7 9 3 1 0 0 1 0 3 5 43 DAYS WITH PRECIPITATION 6 9 10 11 6 1 0 0 1 0 3 10 57 GREATEST DAILY PRECIPITATION 21.0 54.0 25.0 26.0 15.0 4.0 0.0 0.0 1.0 0.0 5.0 43.0 54.0 DAY 13 23 20 23 29 4 ** ** 21 ** 25 6 DAY WITH THUNDER STORM 0 2 0 2 0 0 0 0 1 0 1 0 6 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH DUST 0 0 0 0 0 2 10 0 0 0 2 1 15 WIND DIRECTION (PREVAILING) 225 225 225 90 90 225 225 225 225 270 225 270 225 PREVAILING WIND SPEED(KNOTS) 3.5 3.2 3.9 4.2 6.7 7.9 6.9 8.4 7.2 4.9 5.3 2.9 5.4 PREVAILING WIND PERCENT 25.2 32.1 21.9 24.7 32.3 18.7 25.8 25.2 25.3 18.2 17.3 11.6 20.5 CALMS PERCENT OF WIND 35.5 28.6 31.6 17.3 16.8 15.3 22.6 26.5 36.7 35.7 43.3 60.6 30.9 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 154 150 155 1824 VECTOR WIND DIRECTION (MEAN) 183 225 231 197 74 273 262 229 253 258 256 115 242 VECTOR WIND MAGNITUDE(KNOTS) 0.7 1.4 1.4 0.6 1.7 0.8 2.4 1.5 2.9 1.2 1.5 0.1 0.9 WIND STEADINESES (MEAN %) 30.4 51.9 53.8 17.1 35.4 15.7 60.0 30.0 70.7 36.4 68.2 5.9 25.7 WIND SPEED (MEAN KNOTS) 2.3 2.7 2.6 3.5 4.8 5.1 4.0 5.0 4.1 3.3 2.2 1.7 3.5 FASTEST WIND DIRECTION 180 190 180 90 90 90 250 90 240 90 240 80 90 FASTEST WIND SPEED (KNOTS) 14 14 14 14 16 16 14 16 14 17 12 16 17 DAY 12 5 17 11 23 2 20 1 1 22 11 11 DAYS WITH SKY CLEAR (0-2)/8 17 11 14 10 16 26 31 30 28 25 18 13 239 DAYS WITH P.CLOUDY (3-6)/8 9 12 9 10 14 4 0 1 2 5 11 9 86 DAYS WITH CLOUDY (7-8)/8 5 5 8 10 1 0 0 0 0 1 1 9 40 DAYS WITH VISIBILITY =< 2 KM 3 1 0 0 0 0 0 0 0 1 1 2 8 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** 356.2 357.4 317.7 279.6 229.6 148.7 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 924.1 920.7 920.6 919.1 917.6 912.8 907.8 911.0 916.3 920.8 922.7 924.9 918.2 MAX. QFE PRESSURE IN HPA 928.2 926.0 926.0 924.4 923.4 918.8 911.2 915.2 921.2 927.2 927.2 929.8 929.8 DAY-HOUR 16- 6 1- 6 3- 6 12- 6 2- 6 3- 3 4- 6 12- 6 13- 6 25- 6 30- 6 19- 6 MIN. QFE PRESSURE IN HPA 919.8 916.0 915.4 914.4 913.0 909.0 903.0 905.0 910.8 917.0 917.4 919.2 903.0 DAY-HOUR 11-12 5- 3 14-12 24-12 15-15 24-15 20-12 3-15 1-12 12-15 6-12 11-15 MEAN QNH PRESSURE IN HPA 1012.6 1009.0 1008.8 1007.2 1005.6 1000.4 995.1 998.5 1004.2 1009.0 1011.1 1013.4 1006.2 MAX. QNH PRESSURE IN HPA 1017.0 1014.6 1014.6 1012.9 1011.8 1006.9 998.7 1003.0 1009.5 1015.9 1015.9 1018.7 1018.7 DAY-HOUR 16- 6 1- 6 3- 6 12- 6 2- 6 3- 3 4- 6 12- 6 13- 6 25- 6 30- 6 19- 6 MIN. QNH PRESSURE IN HPA 1008.0 1003.9 1003.2 1002.1 1000.6 996.3 989.9 992.0 998.3 1004.9 1005.4 1007.3 989.9 DAY-HOUR 11-12 5- 3 14-12 24-12 15-15 24-15 20-12 3-15 1-12 12-15 6-12 11-15 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 924.1 920.7 920.5 919.0 917.7 912.9 908.1 911.1 916.3 920.8 922.7 924.9 918.2 MAX. QFE PRESSURE IN HPA 927.4 924.4 925.0 924.0 921.0 918.8 910.2 914.4 919.8 926.0 926.0 928.8 928.8 DAY 16 1 3 12 8 3 4 12 13 25 29 19 MIN. QFE PRESSURE IN HPA 920.8 916.0 916.0 915.0 914.2 909.4 904.4 907.4 911.8 917.0 918.4 919.9 904.4 DAY 12 5 14 23 15 19 21 3 1 22 6 12 MEAN QNH PRESSURE IN HPA 1012.6 1008.9 1008.7 1007.1 1005.7 1000.6 995.3 998.6 1004.2 1009.0 1011.1 1013.4 1006.3 MAX. QNH PRESSURE IN HPA 1016.2 1012.9 1013.6 1012.5 1009.3 1006.9 997.6 1002.1 1008.0 1014.6 1014.6 1017.7 1017.7 DAY 16 1 3 12 8 3 4 12 13 25 29 19 MIN. QNH PRESSURE IN HPA 1009.0 1003.9 1003.9 1002.8 1001.9 996.8 991.4 994.6 999.3 1004.9 1006.5 1008.1 991.4 DAY 12 5 14 23 15 19 21 3 1 22 6 12 MEAN QFF PRESSURE IN HPA 1012.7 1008.7 1007.8 1004.8 1001.0 994.4 988.4 991.4 998.9 1005.7 1009.6 1013.8 1003.1 MAX. QFF PRESSURE IN HPA 1015.8 1013.2 1013.2 1010.5 1006.0 1001.8 991.5 996.0 1003.2 1011.9 1016.3 1018.9 1018.9 DAY 23 10 3 12 8 3 1 24 30 25 29 19 MIN. QFF PRESSURE IN HPA 1007.7 1002.2 1002.5 999.5 996.3 989.3 983.7 985.8 992.1 1000.7 1004.4 1007.2 983.7 DAY 12 5 14 23 24 19 21 4 2 22 6 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 925.2 921.7 921.5 919.9 918.4 913.3 908.5 911.9 917.3 922.0 923.9 925.8 919.1 MAX. QFE PRESSURE IN HPA 928.2 926.0 926.0 924.4 923.4 918.8 911.2 915.2 921.2 927.2 927.2 929.8 929.8 DAY 16 1 3 12 2 3 4 12 13 25 30 19 MIN. QFE PRESSURE IN HPA 922.0 916.0 917.0 915.8 914.8 910.2 904.8 908.4 912.0 918.0 919.2 920.6 904.8 DAY 10 23 14 24 15 18 20 3 1 12 6 4 MEAN QNH PRESSURE IN HPA 1013.8 1010.0 1009.8 1008.0 1006.5 1000.9 995.8 999.5 1005.3 1010.3 1012.4 1014.4 1007.2 MAX. QNH PRESSURE IN HPA 1017.0 1014.6 1014.6 1012.9 1011.8 1006.9 998.7 1003.0 1009.5 1015.9 1015.9 1018.7 1018.7 DAY 16 1 3 12 2 3 4 12 13 25 30 19 MIN. QNH PRESSURE IN HPA 1010.3 1003.9 1004.9 1003.7 1002.6 997.6 991.8 995.7 999.6 1006.0 1007.3 1008.8 991.8 DAY 10 23 14 24 15 18 20 3 1 12 6 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 924.5 921.2 921.2 919.6 918.0 913.1 908.1 911.6 916.8 921.1 922.9 925.1 918.6 MAX. QFE PRESSURE IN HPA 927.2 925.8 925.4 924.4 921.4 918.2 911.0 915.0 920.4 926.2 927.0 929.0 929.0 DAY 19 1 3 12 3 3 25 12 13 25 30 19 MIN. QFE PRESSURE IN HPA 921.0 916.8 916.4 915.2 915.0 910.0 904.0 907.8 911.2 917.0 918.8 920.4 904.0 DAY 11 23 14 24 15 24 20 3 1 22 6 4 MEAN QNH PRESSURE IN HPA 1013.0 1009.5 1009.5 1007.8 1006.1 1000.8 995.4 999.1 1004.7 1009.4 1011.3 1013.7 1006.7 MAX. QNH PRESSURE IN HPA 1015.9 1014.4 1014.0 1012.9 1009.7 1006.2 998.5 1002.8 1008.6 1014.9 1015.7 1017.9 1017.9 DAY 19 1 3 12 3 3 25 12 13 25 30 19 MIN. QNH PRESSURE IN HPA 1009.3 1004.7 1004.3 1003.0 1002.8 997.4 990.9 995.0 998.7 1004.9 1006.9 1008.6 990.9 DAY 11 23 14 24 15 24 20 3 1 22 6 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 923.4 920.1 919.9 918.6 917.1 912.6 907.4 910.4 915.7 920.1 921.8 924.1 917.6 MAX. QFE PRESSURE IN HPA 926.0 925.0 924.0 924.0 920.2 917.8 910.0 913.6 919.0 924.8 925.6 928.0 928.0 DAY 15 1 3 12 27 2 4 24 13 25 30 19 MIN. QFE PRESSURE IN HPA 919.8 916.8 915.4 914.4 913.4 909.6 903.0 906.0 910.8 917.0 917.4 919.8 903.0 DAY 11 23 14 24 15 24 20 3 1 15 6 4 MEAN QNH PRESSURE IN HPA 1011.8 1008.3 1008.1 1006.7 1005.1 1000.2 994.6 997.8 1003.5 1008.3 1010.2 1012.6 1005.6 MAX. QNH PRESSURE IN HPA 1014.6 1013.6 1012.5 1012.5 1008.4 1005.8 997.4 1001.3 1007.1 1013.4 1014.2 1016.8 1016.8 DAY 15 1 3 12 27 2 4 24 13 25 30 19 MIN. QNH PRESSURE IN HPA 1008.0 1004.7 1003.2 1002.1 1001.1 997.0 989.9 993.1 998.3 1004.9 1005.4 1008.0 989.9 DAY 11 23 14 24 15 24 20 3 1 15 6 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 923.6 920.2 920.0 918.4 916.7 912.2 907.1 910.2 915.7 920.1 922.2 924.5 917.6 MAX. QFE PRESSURE IN HPA 926.4 924.8 924.0 923.0 920.0 917.8 909.8 913.8 919.0 924.8 926.2 928.4 928.4 DAY 15 1 3 4 27 2 28 24 13 24 30 19 MIN. QFE PRESSURE IN HPA 920.2 916.0 915.4 914.4 913.0 909.0 903.4 905.0 911.0 917.0 918.4 919.2 903.4 DAY 11 23 14 24 15 24 20 3 1 12 6 11 MEAN QNH PRESSURE IN HPA 1012.1 1008.4 1008.2 1006.5 1004.6 999.8 994.3 997.7 1003.6 1008.3 1010.5 1013.0 1005.6 MAX. QNH PRESSURE IN HPA 1015.1 1013.4 1012.5 1011.4 1008.2 1005.8 997.2 1001.5 1007.1 1013.4 1014.9 1017.2 1017.2 DAY 15 1 3 4 27 2 28 24 13 24 30 19 MIN. QNH PRESSURE IN HPA 1008.4 1003.9 1003.2 1002.1 1000.6 996.3 990.3 992.0 998.5 1004.9 1006.5 1007.3 990.3 DAY 11 23 14 24 15 24 20 3 1 12 6 11 MEAN QFF PRESSURE IN HPA 1012.1 1008.1 1007.2 1004.1 999.8 993.6 987.4 990.6 998.3 1005.1 1009.1 1013.4 1002.4 MAX. QFF PRESSURE IN HPA 1014.7 1013.4 1012.0 1009.1 1003.4 1000.3 989.9 995.3 1002.3 1010.6 1015.3 1018.5 1018.5 DAY 19 10 2 12 12 2 4 24 29 24 30 19 MIN. QFF PRESSURE IN HPA 1007.4 1003.9 1001.5 999.8 995.5 989.0 982.6 983.4 991.5 999.9 1004.6 1006.7 982.6 DAY 11 23 14 22 23 20 21 3 1 12 6 11 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 9.3 12.3 13.5 19.8 28.3 33.6 36.8 36.0 31.6 24.5 17.7 13.2 23.0 MINIMUN AIR TEMPERATURE (C) 4.9 7.0 7.7 11.2 17.3 20.8 26.8 25.0 19.8 14.0 10.0 7.0 14.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 4 14 31 29 7 2 0 0 87 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 0 1 0 0 0 0 0 0 0 0 0 0 1 TEMPERATURE RECORDS LOWEST(C) 1.0 0.0 3.4 6.4 12.4 16.2 21.4 19.4 16.4 10.4 4.4 2.4 0.0 DAY 14 6 5 4 2 7 12 25 21 17 12 17 MAXIMUM AIR TEMPERATURE (C) 12.7 16.0 17.1 24.5 33.0 38.9 40.9 41.3 37.6 29.8 22.6 18.0 27.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 26 30 31 31 30 11 0 0 159 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 18.0 21.0 23.0 29.4 40.4 40.6 43.0 43.2 41.4 37.8 28.0 21.2 43.2 DAY 31 9 30 30 31 18 31 11 16 1 3 3 DIF. BETWEEN (MAX.-MIN.) (C) 7.8 9.0 9.4 13.3 15.7 18.1 14.1 16.3 17.8 15.8 12.6 11.0 13.4 MEAN DAILY TEMP. (MDT) (C) 8.8 11.5 12.4 17.9 25.2 29.8 33.9 33.2 28.7 21.9 16.3 12.5 21.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 5.1 128.8 265.0 399.2 376.7 231.9 44.4 0.0 0.0 1451.1 HEATING DEG. DAYS(BASE 18 0C) 285.6 187.5 173.4 34.0 0.0 0.0 0.0 0.0 0.0 0.3 55.6 171.4 907.8 DEWPOINT (MEAN C) 2.2 5.4 7.0 8.5 8.8 ***** 7.4 8.0 3.4 2.9 3.7 5.3 ***** MIXING RATIO (G/KG) 5.09 6.26 6.99 7.85 8.01 ****** 7.44 7.67 5.62 5.33 5.78 6.16 ****** VAPOUR PRESSURE (HPA) 7.49 9.17 10.21 11.45 11.66 ****** 10.76 11.11 8.19 7.82 8.50 9.07 ****** SATURATION DEF. (HPA) 4.53 5.50 5.60 12.49 26.33 ****** 52.62 50.41 40.65 24.36 12.55 6.49 ****** RELATIVE HUMIDITY (MEAN %) 64 66 68 52 35 *** 18 20 20 28 46 62 *** RELATIVE HUMIDITY (MAX. %) 79 84 87 76 59 37 27 32 38 46 65 83 59 RELATIVE HUMIDITY (MIN. %) 52 50 51 36 22 10 13 12 10 17 32 43 29 RELATIVE HUMIDITY (MEAN% 03UTC) 76 80 84 73 57 37 26 31 37 46 64 81 58 RELATIVE HUMIDITY (MEAN% 09UTC) 58 57 60 45 26 13 15 15 14 21 38 52 35 RELATIVE HUMIDITY (MEAN% 15UTC) 65 68 68 50 32 11 15 15 13 22 43 61 39 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 209.1 243.3 320.0 116.4 15.1 0.0 0.0 0.6 0.0 5.2 38.5 100.0 1048.2 DAYS WITH PRECIPITATION >=10 6 7 9 3 0 0 0 0 0 0 2 4 31 DAYS WITH PRECIPITATION >= 5 7 8 11 4 1 0 0 0 0 0 3 4 38 DAYS WITH PRECIPITATION >= 1 11 13 17 9 3 0 0 0 0 2 4 7 66 DAYS WITH PRECIPITATION 13 18 17 10 5 0 0 1 0 2 6 7 79 GREATEST DAILY PRECIPITATION 51.0 64.0 91.0 39.0 8.0 0.0 0.0 0.6 0.0 4.0 18.1 35.0 91.0 DAY 17 2 13 14 12 ** ** 31 ** 10 21 23 DAY WITH THUNDER STORM 4 4 7 1 1 0 0 1 0 2 2 5 27 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH DUST 0 0 1 0 1 1 3 4 0 2 0 0 12 WIND DIRECTION (PREVAILING) 90 90 225 90 90 270 90 90 225 225 270 225 90 PREVAILING WIND SPEED(KNOTS) 8.3 6.5 5.4 7.6 7.5 5.2 11.5 15.2 7.0 6.5 5.2 3.2 9.5 PREVAILING WIND PERCENT 38.1 17.2 11.0 10.7 20.6 19.3 42.6 21.3 20.7 20.0 12.0 7.7 15.7 CALMS PERCENT OF WIND 36.1 51.7 48.4 43.3 31.0 32.7 21.9 31.6 38.7 36.8 54.7 74.2 41.7 NO. OF WIND OBSERVATION 155 145 155 150 155 150 155 155 150 155 150 155 1830 VECTOR WIND DIRECTION (MEAN) 81 84 190 169 53 264 89 89 256 249 276 289 96 VECTOR WIND MAGNITUDE(KNOTS) 3.0 0.8 0.6 0.4 1.2 1.5 4.3 2.0 2.2 1.2 0.2 0.3 0.5 WIND STEADINESES (MEAN %) 75.0 36.4 21.4 13.8 33.3 42.9 64.2 33.3 61.1 32.4 9.5 33.3 14.3 WIND SPEED (MEAN KNOTS) 4.0 2.2 2.8 2.9 3.6 3.5 6.7 6.0 3.6 3.7 2.1 0.9 3.5 FASTEST WIND DIRECTION 90 90 70 80 90 90 90 90 230 270 90 240 270 FASTEST WIND SPEED (KNOTS) 23 12 19 17 23 19 23 23 14 27 16 10 27 DAY 11 2 12 24 8 17 14 1 17 9 18 10 DAYS WITH SKY CLEAR (0-2)/8 10 11 9 15 19 29 22 28 29 26 15 16 229 DAYS WITH P.CLOUDY (3-6)/8 11 6 11 11 10 1 9 3 1 4 7 11 85 DAYS WITH CLOUDY (7-8)/8 10 12 11 4 2 0 0 0 0 1 8 4 52 DAYS WITH VISIBILITY =< 2 KM 1 1 0 0 0 0 0 0 2 1 0 0 5 DURATION OF SUNSHINE HOURS 145.9 136.0 170.6 242.1 302.4 370.5 341.9 351.4 303.3 279.0 197.2 206.1 3046.4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 923.0 921.5 919.5 919.5 917.9 ****** 911.6 912.8 916.0 921.6 924.4 925.8 ****** MAX. QFE PRESSURE IN HPA 929.0 926.8 925.8 924.2 922.0 ****** 917.4 917.0 923.0 925.5 932.0 929.8 ****** DAY-HOUR 25- 6 8- 6 29- 6 8- 9 17- 6 **-** 3- 9 27- 6 25- 6 21- 6 16- 6 8- 6 MIN. QFE PRESSURE IN HPA 910.3 916.0 913.4 915.2 914.0 ****** 907.2 907.2 912.0 915.0 920.2 923.0 ****** DAY-HOUR 12- 3 5- 3 7-12 12-12 9-15 **-** 6-15 3-15 15-12 4-15 2-12 10-12 MEAN QNH PRESSURE IN HPA 1011.4 1009.8 1007.7 1007.6 1006.0 ****** 999.1 1000.4 1003.8 1009.9 1012.9 1014.5 ****** MAX. QNH PRESSURE IN HPA 1017.9 1015.5 1014.4 1012.7 1010.3 ****** 1005.4 1004.9 1011.4 1014.1 1021.1 1018.7 ****** DAY-HOUR 25- 6 8- 6 29- 6 8- 9 17- 6 **-** 3- 9 27- 6 25- 6 21- 6 16- 6 8- 6 MIN. QNH PRESSURE IN HPA 997.7 1003.9 1001.1 1003.0 1001.7 ****** 994.4 994.4 999.6 1002.8 1008.4 1011.4 ****** DAY-HOUR 12- 3 5- 3 7-12 12-12 9-15 **-** 6-15 3-15 15-12 4-15 2-12 10-12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 922.9 921.5 919.6 919.5 918.1 911.9 912.0 913.0 916.0 921.7 924.4 925.7 918.9 MAX. QFE PRESSURE IN HPA 928.0 926.0 924.8 922.2 921.0 914.6 916.4 916.0 921.4 924.9 930.0 928.5 930.0 DAY 26 8 29 8 17 12 4 29 25 21 16 28 MIN. QFE PRESSURE IN HPA 910.3 916.0 915.4 915.8 915.6 910.0 908.4 910.0 913.3 915.4 921.8 923.0 908.4 DAY 12 5 7 3 19 18 6 3 15 5 2 15 MEAN QNH PRESSURE IN HPA 1011.3 1009.8 1007.8 1007.6 1006.1 999.5 999.5 1000.6 1003.9 1010.0 1012.9 1014.3 1007.0 MAX. QNH PRESSURE IN HPA 1016.8 1014.6 1013.4 1010.5 1009.3 1002.4 1004.3 1003.9 1009.7 1013.5 1019.0 1017.3 1019.0 DAY 26 8 29 8 17 12 4 29 25 21 16 28 MIN. QNH PRESSURE IN HPA 997.7 1003.9 1003.2 1003.7 1003.4 997.4 995.7 997.4 1001.0 1003.2 1010.1 1011.4 995.7 DAY 12 5 7 3 19 18 6 3 15 5 2 15 MEAN QFF PRESSURE IN HPA 1011.9 1009.4 1007.0 1005.1 1001.4 992.8 991.9 993.4 998.3 1006.4 1011.2 1013.9 1003.6 MAX. QFF PRESSURE IN HPA 1018.0 1014.8 1013.1 1008.6 1004.5 995.3 996.9 997.3 1004.7 1010.5 1016.6 1016.8 1018.0 DAY 26 8 29 8 17 29 3 29 25 24 16 28 MIN. QFF PRESSURE IN HPA 997.8 1004.9 1001.8 1000.4 997.5 990.1 988.4 989.2 995.2 999.0 1008.2 1010.9 988.4 DAY 12 5 7 3 19 18 6 3 15 5 7 15 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 924.2 922.7 920.4 920.4 918.8 912.6 912.6 913.7 916.9 922.7 925.4 927.1 919.8 MAX. QFE PRESSURE IN HPA 929.0 926.8 925.8 924.0 922.0 915.0 917.2 917.0 923.0 925.5 932.0 929.8 932.0 DAY 25 8 29 8 17 12 3 27 25 21 16 8 MIN. QFE PRESSURE IN HPA 911.8 918.8 915.0 916.5 916.0 910.2 909.0 910.2 913.3 917.0 922.8 925.0 909.0 DAY 12 5 7 18 9 20 6 3 15 4 1 15 MEAN QNH PRESSURE IN HPA 1012.7 1011.1 1008.6 1008.6 1006.9 1000.2 1000.2 1001.4 1004.8 1011.1 1014.0 1015.8 1007.9 MAX. QNH PRESSURE IN HPA 1017.9 1015.5 1014.4 1012.5 1010.3 1002.8 1005.2 1004.9 1011.4 1014.1 1021.1 1018.7 1021.1 DAY 25 8 29 8 17 12 3 27 25 21 16 8 MIN. QNH PRESSURE IN HPA 999.3 1006.9 1002.8 1004.4 1003.9 997.6 996.3 997.6 1001.0 1004.9 1011.2 1013.6 996.3 DAY 12 5 7 18 9 20 6 3 15 4 1 15 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 923.5 922.0 920.0 920.0 918.5 912.3 912.2 913.5 916.5 922.0 924.7 926.3 919.3 MAX. QFE PRESSURE IN HPA 928.8 926.4 925.2 924.2 921.8 915.0 917.4 916.4 922.8 925.0 930.4 929.0 930.4 DAY 25 19 28 8 17 12 3 27 25 20 16 4 MIN. QFE PRESSURE IN HPA 911.0 917.6 913.8 917.0 916.0 910.0 908.8 910.0 912.7 916.2 921.7 924.4 908.8 DAY 12 21 7 18 9 20 6 3 15 5 2 10 MEAN QNH PRESSURE IN HPA 1012.0 1010.3 1008.2 1008.2 1006.5 999.9 999.8 1001.1 1004.4 1010.4 1013.2 1014.9 1007.4 MAX. QNH PRESSURE IN HPA 1017.7 1015.1 1013.8 1012.7 1010.1 1002.8 1005.4 1004.3 1011.2 1013.6 1019.4 1017.9 1019.4 DAY 25 19 28 8 17 12 3 27 25 20 16 4 MIN. QNH PRESSURE IN HPA 998.5 1005.6 1001.5 1004.9 1003.9 997.4 996.1 997.4 1000.3 1004.1 1010.0 1012.9 996.1 DAY 12 21 7 18 9 20 6 3 15 5 2 10 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 922.2 920.6 918.8 919.0 917.6 911.4 910.9 912.2 915.2 920.9 923.7 925.0 918.1 MAX. QFE PRESSURE IN HPA 927.2 924.9 925.2 924.0 920.0 913.4 916.0 915.4 921.2 923.5 928.8 927.6 928.8 DAY 25 19 28 8 6 12 3 28 25 20 16 28 MIN. QFE PRESSURE IN HPA 911.5 916.2 913.4 915.2 914.9 909.7 908.0 908.2 912.0 915.2 920.2 923.0 908.0 DAY 12 10 7 12 9 18 6 3 15 4 2 10 MEAN QNH PRESSURE IN HPA 1010.5 1008.9 1006.9 1007.1 1005.6 998.9 998.4 999.8 1003.1 1009.1 1012.1 1013.5 1006.2 MAX. QNH PRESSURE IN HPA 1015.9 1013.5 1013.8 1012.5 1008.2 1001.1 1003.9 1003.2 1009.5 1011.9 1017.7 1016.4 1017.7 DAY 25 19 28 8 6 12 3 28 25 20 16 28 MIN. QNH PRESSURE IN HPA 999.0 1004.1 1001.1 1003.0 1002.7 997.1 995.3 995.5 999.6 1003.0 1008.4 1011.4 995.3 DAY 12 10 7 12 9 18 6 3 15 4 2 10 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 922.5 920.7 918.8 918.7 916.8 911.1 910.3 911.8 915.3 921.0 923.9 925.2 918.0 MAX. QFE PRESSURE IN HPA 928.0 925.0 925.2 923.0 919.2 912.8 915.0 915.0 921.2 923.8 929.8 927.8 929.8 DAY 25 19 28 7 17 12 3 28 25 23 15 8 MIN. QFE PRESSURE IN HPA 913.0 916.0 913.7 916.0 914.0 909.0 907.2 907.2 912.3 915.0 920.2 923.2 907.2 DAY 12 10 12 2 9 17 6 3 15 4 6 16 MEAN QNH PRESSURE IN HPA 1010.9 1008.9 1006.9 1006.8 1004.8 998.6 997.7 999.3 1003.1 1009.2 1012.4 1013.8 1006.0 MAX. QNH PRESSURE IN HPA 1016.8 1013.6 1013.8 1011.4 1007.3 1000.4 1002.8 1002.8 1009.5 1012.3 1018.7 1016.6 1018.7 DAY 25 19 28 7 17 12 3 28 25 23 15 8 MIN. QNH PRESSURE IN HPA 1000.6 1003.9 1001.4 1003.9 1001.7 996.3 994.4 994.4 999.9 1002.8 1008.4 1011.6 994.4 DAY 12 10 12 2 9 17 6 3 15 4 6 16 MEAN QFF PRESSURE IN HPA 1011.4 1008.4 1006.0 1004.2 1000.0 992.2 990.1 992.1 997.5 1005.7 1010.7 1013.4 1002.6 MAX. QFF PRESSURE IN HPA 1017.7 1012.5 1013.3 1009.3 1002.9 994.4 995.5 996.3 1004.4 1009.8 1016.3 1015.9 1017.7 DAY 25 7 28 7 4 28 3 28 25 23 15 8 MIN. QFF PRESSURE IN HPA 1001.8 1002.4 1000.2 1001.2 997.1 988.7 987.1 986.2 994.2 998.2 1006.3 1011.0 986.2 DAY 12 10 7 9 9 17 14 3 15 4 6 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 10.6 10.4 11.9 18.7 27.1 33.5 35.1 35.3 31.1 25.0 15.9 11.3 22.2 MINIMUN AIR TEMPERATURE (C) 4.6 2.6 5.9 10.7 16.2 21.9 23.5 23.8 18.3 16.1 10.4 6.5 13.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 19 31 29 2 2 0 0 85 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 0 11 1 0 0 0 0 0 0 0 0 0 12 TEMPERATURE RECORDS LOWEST(C) 1.4 -3.8 0.0 1.6 9.4 16.2 21.2 19.4 15.0 10.4 5.4 2.2 -3.8 DAY 26 7 1 13 1 5 7 31 15 28 29 27 MAXIMUM AIR TEMPERATURE (C) 14.8 15.4 15.7 23.3 31.8 38.1 40.8 41.5 37.1 30.4 20.2 15.6 27.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 21 30 31 31 30 19 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) 20.4 23.2 20.4 29.0 38.0 42.4 45.0 45.8 40.0 35.8 25.0 21.0 45.8 DAY 11 21 2 27 28 28 31 1 2 6 1 8 DIF. BETWEEN (MAX.-MIN.) (C) 10.2 12.8 9.8 12.6 15.6 16.2 17.3 17.7 18.8 14.3 9.8 9.1 13.6 MEAN DAILY TEMP. (MDT) (C) 9.7 9.0 10.8 17.0 24.0 30.0 32.2 32.6 27.7 23.2 15.3 11.0 20.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 3.0 108.0 270.8 346.2 360.9 201.0 87.1 0.0 0.0 1377.0 HEATING DEG. DAYS(BASE 18 0C) 257.6 252.5 223.4 53.8 0.3 0.0 0.0 0.0 0.0 0.0 84.0 216.0 1087.6 DEWPOINT (MEAN C) 2.0 -2.3 5.2 ***** 7.0 5.8 6.9 6.6 1.8 6.8 8.5 5.1 ***** MIXING RATIO (G/KG) 4.90 3.69 6.21 ****** 7.04 6.62 7.13 7.00 4.98 7.04 7.71 6.14 ****** VAPOUR PRESSURE (HPA) 7.21 5.44 9.08 ****** 10.26 9.60 10.29 10.13 7.28 10.30 11.28 9.01 ****** SATURATION DEF. (HPA) 5.92 7.92 5.21 ****** 27.61 43.95 48.78 49.56 40.06 23.12 7.24 4.69 ****** RELATIVE HUMIDITY (MEAN %) 60 45 66 *** 32 20 20 20 19 37 64 68 *** RELATIVE HUMIDITY (MAX. %) 82 71 87 78 56 36 37 35 37 57 85 84 62 RELATIVE HUMIDITY (MIN. %) 40 27 51 38 20 12 11 11 9 23 47 53 29 RELATIVE HUMIDITY (MEAN% 03UTC) 80 70 83 80 55 36 37 35 37 55 81 80 61 RELATIVE HUMIDITY (MEAN% 09UTC) 47 35 56 45 25 15 14 14 11 26 53 59 33 RELATIVE HUMIDITY (MEAN% 15UTC) 56 36 65 54 25 15 12 13 12 34 64 71 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 75.8 0.8 341.8 30.0 13.7 3.0 0.0 0.0 0.0 25.8 89.6 168.1 748.6 DAYS WITH PRECIPITATION >=10 2 0 10 0 0 0 0 0 0 1 3 4 20 DAYS WITH PRECIPITATION >= 5 4 0 14 4 1 0 0 0 0 1 6 5 35 DAYS WITH PRECIPITATION >= 1 8 0 19 8 3 1 0 0 0 1 6 8 54 DAYS WITH PRECIPITATION 9 2 20 12 7 1 0 0 0 5 13 12 81 GREATEST DAILY PRECIPITATION 44.3 0.4 60.0 6.0 9.0 3.0 0.0 0.0 0.0 24.0 31.0 46.0 60.0 DAY 16 19 13 5 5 1 ** ** ** 24 5 21 DAY WITH THUNDER STORM 2 0 6 2 2 2 0 0 0 3 5 3 25 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH DUST 0 1 2 3 3 1 6 6 0 0 0 0 22 WIND DIRECTION (PREVAILING) 225 270 90 225 225 225 225 225 225 315 90 90 225 PREVAILING WIND SPEED(KNOTS) 4.2 3.8 5.7 7.8 6.9 6.5 6.5 6.8 5.9 5.6 8.8 6.7 6.0 PREVAILING WIND PERCENT 12.9 17.1 12.3 12.0 17.4 14.7 28.4 29.7 16.7 15.5 8.7 16.1 15.2 CALMS PERCENT OF WIND 54.2 45.7 52.3 52.7 32.3 30.7 46.5 39.4 44.7 49.7 57.3 58.7 47.0 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 180 251 176 211 167 284 251 245 277 298 50 111 246 VECTOR WIND MAGNITUDE(KNOTS) 0.6 0.9 0.6 0.8 0.2 0.1 1.9 2.0 2.1 1.0 0.4 0.9 0.6 WIND STEADINESES (MEAN %) 28.6 36.0 22.2 26.7 4.5 2.3 65.5 52.6 65.6 37.0 21.1 47.4 20.0 WIND SPEED (MEAN KNOTS) 2.1 2.5 2.7 3.0 4.4 4.3 2.9 3.8 3.2 2.7 1.9 1.9 3.0 FASTEST WIND DIRECTION 180 90 210 90 90 80 240 90 310 330 90 90 90 FASTEST WIND SPEED (KNOTS) 17 19 23 29 19 19 12 17 14 14 16 17 29 DAY 16 26 7 22 7 23 13 25 4 14 9 28 DAYS WITH SKY CLEAR (0-2)/8 12 18 7 12 17 23 31 28 29 16 13 11 217 DAYS WITH P.CLOUDY (3-6)/8 13 8 13 15 11 7 0 3 1 12 9 14 106 DAYS WITH CLOUDY (7-8)/8 6 2 11 3 3 0 0 0 0 3 8 6 42 DAYS WITH VISIBILITY =< 2 KM 0 0 0 0 0 0 0 0 0 0 2 2 4 DURATION OF SUNSHINE HOURS 187.7 238.8 165.5 251.0 305.0 349.8 373.4 352.8 330.0 242.2 188.2 186.1 3170.5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 923.4 923.1 919.1 ****** 917.6 912.6 908.6 911.2 917.1 921.5 922.3 923.0 ****** MAX. QFE PRESSURE IN HPA 928.3 927.3 927.2 ****** 921.7 918.0 912.2 915.8 923.0 924.5 927.2 929.0 ****** DAY-HOUR 11- 6 7- 6 1- 6 **-** 12- 9 8- 3 25- 6 31- 9 30- 6 13- 6 4- 9 30- 6 MIN. QFE PRESSURE IN HPA 914.1 917.0 908.2 ****** 912.8 905.2 904.8 907.0 912.2 917.2 919.0 916.3 ****** DAY-HOUR 17-12 21-15 29- 6 **-** 19-15 29-15 16- 3 1-12 2-15 15-12 19-12 10- 9 MEAN QNH PRESSURE IN HPA 1011.8 1011.5 1007.2 ****** 1005.6 1000.2 995.9 998.7 1005.0 1009.8 1010.7 1011.4 ****** MAX. QNH PRESSURE IN HPA 1017.1 1016.0 1015.9 ****** 1010.0 1006.0 999.8 1003.7 1011.4 1013.0 1015.9 1017.9 ****** DAY-HOUR 11- 6 7- 6 1- 6 **-** 12- 9 8- 3 25- 6 31- 9 30- 6 13- 6 4- 9 30- 6 MIN. QNH PRESSURE IN HPA 1001.8 1004.9 995.5 ****** 1000.4 992.2 991.8 994.2 999.8 1005.2 1007.1 1004.2 ****** DAY-HOUR 17-12 21-15 29- 6 **-** 19-15 29-15 16- 3 1-12 2-15 15-12 19-12 10- 9 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 923.4 923.1 918.9 918.7 918.0 912.8 908.6 911.3 917.1 921.5 922.2 922.9 918.2 MAX. QFE PRESSURE IN HPA 927.8 926.0 926.8 923.0 920.9 918.0 911.2 914.9 921.8 923.4 926.0 927.8 927.8 DAY 11 7 1 14 13 8 25 10 30 29 8 30 MIN. QFE PRESSURE IN HPA 914.4 918.7 910.2 914.3 914.2 906.2 904.8 907.3 913.0 919.0 920.0 916.7 904.8 DAY 16 19 25 5 31 29 16 1 3 15 24 10 MEAN QNH PRESSURE IN HPA 1011.8 1011.6 1007.0 1006.8 1006.0 1000.5 995.9 998.8 1005.0 1009.8 1010.5 1011.3 1006.2 MAX. QNH PRESSURE IN HPA 1016.6 1014.6 1015.5 1011.4 1009.1 1006.0 998.7 1002.7 1010.1 1011.8 1014.6 1016.6 1016.6 DAY 11 7 1 14 13 8 25 10 30 29 8 30 MIN. QNH PRESSURE IN HPA 1002.1 1006.8 997.6 1002.0 1001.9 993.3 991.8 994.5 1000.6 1007.1 1008.2 1004.6 991.8 DAY 16 19 25 5 31 29 16 1 3 15 24 10 MEAN QFF PRESSURE IN HPA 1012.2 1012.2 1006.7 1004.3 1001.4 994.0 989.0 992.0 999.6 1005.8 1009.0 1011.2 1003.1 MAX. QFF PRESSURE IN HPA 1016.1 1017.8 1016.8 1010.1 1006.7 1000.5 992.0 996.5 1005.5 1009.3 1012.5 1016.7 1017.8 DAY 20 7 1 14 6 8 25 31 30 28 8 30 MIN. QFF PRESSURE IN HPA 1001.6 1005.1 995.9 998.9 995.9 985.7 985.0 986.9 994.5 1002.0 1006.1 1004.0 985.0 DAY 16 19 25 5 31 29 16 1 3 15 11 10 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 924.5 924.2 920.1 919.6 918.6 913.4 909.1 912.0 918.0 922.5 923.4 924.0 919.1 MAX. QFE PRESSURE IN HPA 928.3 927.3 927.2 924.1 921.3 918.0 912.2 915.7 923.0 924.5 926.9 929.0 929.0 DAY 11 7 1 14 12 8 25 10 30 13 5 30 MIN. QFE PRESSURE IN HPA 916.3 920.2 908.2 915.0 915.0 907.0 904.8 908.0 914.9 920.0 920.8 917.4 904.8 DAY 17 19 29 5 31 29 16 1 3 15 24 10 MEAN QNH PRESSURE IN HPA 1013.0 1012.7 1008.2 1007.8 1006.7 1001.1 996.5 999.6 1006.1 1010.9 1011.8 1012.5 1007.2 MAX. QNH PRESSURE IN HPA 1017.1 1016.0 1015.9 1012.6 1009.6 1006.0 999.8 1003.5 1011.4 1013.0 1015.6 1017.9 1017.9 DAY 11 7 1 14 12 8 25 10 30 13 5 30 MIN. QNH PRESSURE IN HPA 1004.2 1008.4 995.5 1002.8 1002.8 994.2 991.8 995.3 1002.7 1008.2 1009.0 1005.4 991.8 DAY 17 19 29 5 31 29 16 1 3 15 24 10 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 923.9 923.7 919.6 919.1 918.1 913.1 909.0 911.6 917.5 921.8 922.7 923.1 918.6 MAX. QFE PRESSURE IN HPA 927.9 927.0 927.0 923.4 921.7 917.6 912.2 915.8 921.8 924.1 927.2 927.7 927.9 DAY 11 7 1 14 12 8 25 31 30 31 4 30 MIN. QFE PRESSURE IN HPA 915.3 920.1 911.5 915.1 914.0 907.0 905.0 908.0 914.0 918.8 919.9 916.3 905.0 DAY 17 19 29 5 19 29 16 1 2 6 24 10 MEAN QNH PRESSURE IN HPA 1012.4 1012.1 1007.8 1007.2 1006.2 1000.7 996.3 999.1 1005.5 1010.1 1011.1 1011.5 1006.7 MAX. QNH PRESSURE IN HPA 1016.7 1015.7 1015.7 1011.8 1010.0 1005.6 999.8 1003.7 1010.1 1012.6 1015.9 1016.5 1016.7 DAY 11 7 1 14 12 8 25 31 30 31 4 30 MIN. QNH PRESSURE IN HPA 1003.1 1008.3 999.0 1002.9 1001.7 994.2 992.0 995.3 1001.7 1006.9 1008.1 1004.2 992.0 DAY 17 19 29 5 19 29 16 1 2 6 24 10 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 922.5 922.2 918.4 918.0 917.0 912.0 908.2 910.6 916.3 920.8 921.6 922.3 917.5 MAX. QFE PRESSURE IN HPA 926.0 925.7 925.2 923.9 921.0 916.3 911.0 914.2 920.2 923.3 924.9 926.0 926.0 DAY 10 6 1 13 12 8 25 31 30 31 7 29 MIN. QFE PRESSURE IN HPA 914.1 918.0 911.2 914.0 913.2 906.0 905.0 907.0 912.8 917.2 919.0 916.3 905.0 DAY 17 21 25 5 19 29 16 1 2 15 19 10 MEAN QNH PRESSURE IN HPA 1010.9 1010.5 1006.5 1006.0 1005.0 999.6 995.5 998.1 1004.2 1009.1 1009.9 1010.6 1005.5 MAX. QNH PRESSURE IN HPA 1014.6 1014.3 1013.8 1012.4 1009.3 1004.2 998.5 1001.9 1008.4 1011.7 1013.5 1014.6 1014.6 DAY 10 6 1 13 12 8 25 31 30 31 7 29 MIN. QNH PRESSURE IN HPA 1001.8 1006.0 998.7 1001.7 1000.9 993.1 992.0 994.2 1000.4 1005.2 1007.1 1004.2 992.0 DAY 17 21 25 5 19 29 16 1 2 15 19 10 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 922.8 922.2 918.4 918.1 916.5 911.7 907.9 910.7 916.3 921.0 921.9 922.6 917.5 MAX. QFE PRESSURE IN HPA 926.2 925.9 925.2 923.7 920.0 916.2 910.7 914.2 920.0 923.0 924.9 926.6 926.6 DAY 10 6 1 13 12 4 25 31 29 8 7 29 MIN. QFE PRESSURE IN HPA 915.2 917.0 910.6 914.3 912.8 905.2 904.8 907.0 912.2 917.6 919.9 917.7 904.8 DAY 25 21 29 4 19 29 16 1 2 6 24 10 MEAN QNH PRESSURE IN HPA 1011.2 1010.5 1006.4 1006.1 1004.5 999.3 995.2 998.1 1004.2 1009.3 1010.2 1011.0 1005.5 MAX. QNH PRESSURE IN HPA 1014.9 1014.5 1013.8 1012.2 1008.2 1004.1 998.2 1001.9 1008.2 1011.4 1013.5 1015.3 1015.3 DAY 10 6 1 13 12 4 25 31 29 8 7 29 MIN. QNH PRESSURE IN HPA 1003.0 1004.9 998.1 1002.0 1000.4 992.2 991.8 994.2 999.8 1005.6 1008.1 1005.7 991.8 DAY 25 21 29 4 19 29 16 1 2 6 24 10 MEAN QFF PRESSURE IN HPA 1011.5 1011.2 1006.1 1003.4 999.9 992.9 988.3 991.3 998.9 1005.4 1008.7 1010.9 1002.4 MAX. QFF PRESSURE IN HPA 1015.6 1017.4 1014.4 1008.0 1004.9 999.3 991.5 996.3 1003.9 1009.2 1011.7 1014.9 1017.4 DAY 19 6 1 15 9 4 25 31 30 28 29 29 MIN. QFF PRESSURE IN HPA 1002.0 1002.3 997.2 999.8 994.3 985.1 985.4 986.6 993.0 1000.3 1006.3 1004.7 985.1 DAY 16 21 24 27 30 29 16 1 2 6 24 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION IZEH (99455) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 51 N LONGITUDE 49 52 E DATA PROCESSING CENTER ELEVATION 767.0 M MEANS AND EXTREMES FOR THE YEAR 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 8.3 11.5 14.4 21.3 28.5 35.8 36.6 37.3 32.6 25.8 20.1 16.3 24.1 MINIMUN AIR TEMPERATURE (C) 3.6 6.0 8.3 11.8 17.2 23.8 26.3 26.5 21.5 15.3 9.6 8.3 14.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 3 27 31 31 17 3 0 0 112 DAYS WITH MINIMUM TEMP. <=-4 2 0 0 0 0 0 0 0 0 0 0 0 2 DAYS WITH FREEZING MIN.<= 0 4 1 0 0 0 0 0 0 0 0 0 0 5 TEMPERATURE RECORDS LOWEST(C) -6.8 -0.4 3.0 6.2 10.6 19.0 21.0 22.0 17.8 11.2 6.2 4.4 -6.8 DAY 14 17 6 25 2 1 9 24 23 27 26 17 MAXIMUM AIR TEMPERATURE (C) 11.9 15.4 18.4 26.3 33.1 40.1 41.7 42.3 38.1 31.6 26.3 22.3 28.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 6 26 30 31 31 30 25 0 0 179 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 15.2 21.2 25.0 30.6 39.0 43.4 45.6 45.0 42.0 36.0 28.6 27.2 45.6 DAY 20 6 28 13 28 27 13 19 1 2 22 10 DIF. BETWEEN (MAX.-MIN.) (C) 8.3 9.4 10.1 14.5 15.9 16.3 15.4 15.8 16.6 16.3 16.7 14.0 14.0 MEAN DAILY TEMP. (MDT) (C) 7.8 10.7 13.3 19.0 25.2 32.0 34.0 34.4 29.8 23.4 17.9 15.3 21.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 7.0 135.7 329.3 403.4 415.4 263.0 80.1 0.5 0.0 1634.4 HEATING DEG. DAYS(BASE 18 0C) 317.1 204.6 145.5 24.3 0.0 0.0 0.0 0.0 0.0 0.0 16.3 84.0 791.8 DEWPOINT (MEAN C) 2.7 3.2 6.8 7.4 6.0 4.3 8.6 10.3 10.4 3.2 0.2 2.3 5.5 MIXING RATIO (G/KG) 5.20 5.52 7.00 7.30 6.68 5.86 8.04 9.01 8.82 5.50 4.38 5.22 6.55 VAPOUR PRESSURE (HPA) 7.64 8.09 10.24 10.65 9.74 8.52 11.60 13.01 12.79 8.06 6.46 7.69 9.54 SATURATION DEF. (HPA) 3.60 6.00 6.79 15.75 30.99 52.27 51.95 52.87 38.38 26.74 18.16 11.59 26.26 RELATIVE HUMIDITY (MEAN %) 71 60 63 44 28 16 20 22 27 26 30 44 38 RELATIVE HUMIDITY (MAX. %) 86 80 83 69 55 28 36 35 43 43 50 64 56 RELATIVE HUMIDITY (MIN. %) 54 46 48 29 16 10 13 15 19 16 17 29 26 RELATIVE HUMIDITY (MEAN% 03UTC) 83 77 82 67 54 28 35 35 42 42 49 62 55 RELATIVE HUMIDITY (MEAN% 09UTC) 62 50 55 35 18 11 15 17 22 19 20 35 30 RELATIVE HUMIDITY (MEAN% 15UTC) 73 62 63 41 21 13 14 18 22 21 27 42 35 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 241.3 151.9 130.1 8.0 12.2 1.0 0.0 2.0 0.0 3.4 2.0 18.2 570.1 DAYS WITH PRECIPITATION >=10 7 6 5 0 1 0 0 0 0 0 0 0 19 DAYS WITH PRECIPITATION >= 5 10 6 7 0 1 0 0 0 0 0 0 2 26 DAYS WITH PRECIPITATION >= 1 11 7 12 4 2 1 0 1 0 1 1 4 44 DAYS WITH PRECIPITATION 15 9 15 5 4 1 0 1 0 2 2 6 60 GREATEST DAILY PRECIPITATION 65.0 47.2 56.0 3.0 10.0 1.0 0.0 2.0 0.0 3.0 2.0 7.0 65.0 DAY 5 10 30 28 14