STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1986 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. 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OF WIND OBSERVATION **** **** **** 101 129 120 124 124 120 124 120 124 1086 VECTOR WIND DIRECTION (MEAN) *** *** *** *** 195 280 253 285 270 227 179 185 *** VECTOR WIND MAGNITUDE(KNOTS) **** **** **** **** 3.1 6.0 3.7 2.9 2.6 2.7 2.0 1.3 **** WIND STEADINESES (MEAN %) ***** ***** ***** ***** 44.9 75.0 52.9 34.5 46.4 49.1 64.5 32.5 ***** WIND SPEED (MEAN KNOTS) **** **** **** **** 6.9 8.0 7.0 8.4 5.6 5.5 3.1 4.0 **** FASTEST WIND DIRECTION *** *** *** *** 150 350 30 300 90 180 180 250 *** FASTEST WIND SPEED (KNOTS) *** *** *** *** 23 17 19 23 16 19 16 19 *** DAY ** ** ** ** 3 2 22 18 1 1 2 30 DAYS WITH SKY CLEAR (0-2)/8 **** **** **** 1 10 27 22 25 26 14 9 15 **** DAYS WITH P.CLOUDY (3-6)/8 **** **** **** 16 15 3 9 6 4 11 9 6 **** DAYS WITH CLOUDY (7-8)/8 **** **** **** 7 6 0 0 0 0 6 12 10 **** DAYS WITH VISIBILITY =< 2 KM **** **** **** 0 0 0 0 0 0 0 1 0 **** DURATION OF SUNSHINE HOURS ****** ****** ****** 152.4 272.8 358.9 346.2 350.9 301.0 223.8 173.4 200.2 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1986 JAN. 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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 ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1986 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** 862.6 862.7 858.5 858.8 860.4 865.5 867.8 865.5 866.2 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** 867.9 868.9 866.1 862.1 863.3 870.5 871.9 870.4 872.1 ****** DAY ** ** ** 15 21 2 31 24 23 15 15 23 MIN. 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QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** 862.7 862.8 858.5 858.9 860.3 865.2 867.5 865.0 865.8 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** 867.4 867.0 866.2 861.9 863.6 870.0 872.0 870.2 871.7 ****** DAY ** ** ** 15 20 2 4 24 23 15 15 23 MIN. QFE PRESSURE IN HPA ****** ****** ****** 858.2 856.0 854.4 855.2 854.0 860.8 860.6 858.2 858.0 ****** DAY ** ** ** 9 4 25 20 5 5 1 8 27 MEAN QNH PRESSURE IN HPA ****** ****** ****** 1013.1 1013.1 1008.3 1008.7 1010.3 1015.9 1018.5 1015.7 1016.6 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** 1018.4 1018.0 1017.1 1012.2 1014.1 1021.4 1023.7 1021.6 1023.3 ****** DAY ** ** ** 15 20 2 4 24 23 15 15 23 MIN. 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QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 ****** ****** ****** 861.7 861.8 857.9 858.2 859.4 864.1 866.7 864.5 865.6 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** 866.7 866.3 865.4 861.3 863.2 868.7 871.5 870.2 871.3 ****** DAY ** ** ** 14 18 2 31 24 23 15 15 23 MIN. 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QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** 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 ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 8.2 9.3 7.5 15.3 23.4 28.3 30.6 29.9 26.1 17.8 12.8 6.1 17.9 MINIMUN AIR TEMPERATURE (C) 1.4 3.8 3.6 8.5 16.4 19.2 22.5 22.1 18.6 12.5 6.7 1.8 11.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 6 28 19 4 0 0 0 58 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 1 1 DAYS WITH FREEZING MIN.<= 0 11 3 5 0 0 0 0 0 0 0 0 8 27 TEMPERATURE RECORDS LOWEST(C) -2.2 -0.8 -2.2 1.6 9.8 15.0 17.8 14.3 14.4 7.8 1.4 -4.2 -4.2 DAY 1 11 20 1 26 11 10 27 21 31 28 31 MAXIMUM AIR TEMPERATURE (C) 12.7 13.4 11.5 19.9 28.0 33.2 35.9 34.9 31.1 22.3 17.9 10.1 22.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 8 30 30 30 19 2 0 0 119 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 20.2 19.6 16.0 29.5 31.0 37.2 38.8 38.2 36.2 30.0 22.4 15.4 38.8 DAY 18 1 3 30 29 27 18 6 9 3 17 3 DIF. BETWEEN (MAX.-MIN.) (C) 11.3 9.6 7.9 11.4 11.6 14.0 13.4 12.8 12.5 9.8 11.2 8.3 11.2 MEAN DAILY TEMP. (MDT) (C) 7.0 8.6 7.6 14.2 22.2 26.2 29.2 28.5 24.8 17.4 12.3 5.9 17.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.8 50.0 156.5 246.2 232.6 114.6 7.5 0.0 0.0 808.4 HEATING DEG. DAYS(BASE 18 0C) 294.0 262.9 313.7 124.0 1.2 0.0 0.0 0.0 0.0 52.2 167.2 373.9 1589.0 DEWPOINT (MEAN C) -5.8 -1.7 1.1 -0.7 2.7 -1.5 2.2 1.1 -1.7 3.8 -0.9 -1.0 -0.2 MIXING RATIO (G/KG) 3.05 4.10 5.06 4.56 5.62 4.13 5.41 4.99 4.09 6.27 4.44 4.36 4.67 VAPOUR PRESSURE (HPA) 4.23 5.66 6.94 6.27 7.74 5.67 7.41 6.84 5.64 8.62 6.14 6.03 6.43 SATURATION DEF. (HPA) 7.27 6.45 3.78 12.14 21.76 33.97 37.67 36.21 29.09 12.58 9.15 3.69 17.81 RELATIVE HUMIDITY (MEAN %) 41 51 67 38 29 16 18 17 18 46 42 65 37 RELATIVE HUMIDITY (MAX. %) 54 66 83 56 42 24 27 25 29 61 57 79 50 RELATIVE HUMIDITY (MIN. %) 29 37 49 26 19 10 11 11 11 32 27 50 26 RELATIVE HUMIDITY (MEAN% 03UTC) 48 60 78 50 37 24 26 23 28 53 50 72 46 RELATIVE HUMIDITY (MEAN% 09UTC) 32 41 56 32 22 12 13 12 13 34 30 57 30 RELATIVE HUMIDITY (MEAN% 15UTC) 50 55 70 34 28 13 15 15 15 49 45 67 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 8.1 101.6 283.0 21.4 27.4 0.0 2.8 1.0 0.0 125.6 48.0 201.4 820.3 DAYS WITH PRECIPITATION >=10 0 3 10 0 1 0 0 0 0 5 2 7 28 DAYS WITH PRECIPITATION >= 5 0 5 12 2 2 0 0 0 0 8 4 9 42 DAYS WITH PRECIPITATION >= 1 2 10 20 6 6 0 1 1 0 11 4 10 71 DAYS WITH PRECIPITATION 6 11 23 8 7 0 3 2 1 16 5 11 93 GREATEST DAILY PRECIPITATION 4.0 36.0 50.0 6.0 10.0 0.0 2.0 1.0 0.0 28.4 18.0 56.0 56.0 DAY 7 5 4 4 5 ** 31 1 ** 24 2 23 DAY WITH THUNDER STORM 2 9 7 5 5 0 2 2 0 12 4 7 55 DAYS WITH SNOW OR SLEET 1 0 4 0 0 0 0 0 0 0 0 1 6 DAYS WITH DUST 2 0 0 0 1 3 3 1 4 3 0 0 17 WIND DIRECTION (PREVAILING) 225 135 180 180 225 270 270 270 225 180 180 180 225 PREVAILING WIND SPEED(KNOTS) 5.8 10.1 8.4 8.1 8.7 9.1 9.2 8.8 7.8 8.8 8.4 8.0 7.5 PREVAILING WIND PERCENT 13.2 13.1 17.2 14.4 11.8 20.0 19.4 26.9 15.6 19.4 10.0 19.9 11.7 CALMS PERCENT OF WIND 52.7 53.1 48.9 50.6 51.1 41.1 46.2 39.2 55.6 45.7 68.3 59.1 50.9 NO. OF WIND OBSERVATION 129 145 186 180 186 180 186 186 180 186 180 186 2110 VECTOR WIND DIRECTION (MEAN) 187 173 183 211 249 276 277 268 262 146 192 182 222 VECTOR WIND MAGNITUDE(KNOTS) 2.1 2.5 2.9 1.9 1.1 3.1 2.2 3.2 2.6 1.6 1.3 1.9 1.5 WIND STEADINESES (MEAN %) 65.6 67.6 69.0 55.9 28.9 63.3 47.8 65.3 72.2 36.4 52.0 65.5 39.5 WIND SPEED (MEAN KNOTS) 3.2 3.7 4.2 3.4 3.8 4.9 4.6 4.9 3.6 4.4 2.5 2.9 3.8 FASTEST WIND DIRECTION 130 150 30 230 240 300 270 240 270 190 240 270 270 FASTEST WIND SPEED (KNOTS) 16 19 16 14 17 14 16 14 12 17 17 39 39 DAY 6 25 4 4 21 9 19 1 1 6 19 7 DAYS WITH SKY CLEAR (0-2)/8 17 8 5 16 10 29 28 25 28 13 20 7 206 DAYS WITH P.CLOUDY (3-6)/8 11 13 15 12 11 1 3 6 2 11 5 11 101 DAYS WITH CLOUDY (7-8)/8 2 7 11 2 10 0 0 0 0 7 5 13 57 DAYS WITH VISIBILITY =< 2 KM 1 1 3 0 0 3 0 1 2 0 2 3 16 DURATION OF SUNSHINE HOURS 211.0 200.2 157.4 272.0 216.4 334.5 335.2 325.5 297.4 218.6 220.4 124.1 2912.7 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 867.3 865.0 860.8 864.3 863.9 860.8 859.0 859.7 863.5 865.7 867.5 866.4 863.7 MAX. QFE PRESSURE IN HPA 873.2 872.9 865.8 871.0 868.3 865.2 862.0 864.0 868.5 870.1 872.0 873.0 873.2 DAY-HOUR 17- 6 1- 6 31-18 22- 9 4-12 29- 6 30- 6 6- 6 25- 6 14- 6 30-18 2- 6 MIN. QFE PRESSURE IN HPA 855.6 858.1 852.3 856.9 859.7 856.5 854.7 856.5 860.2 860.0 861.3 857.1 852.3 DAY-HOUR 6-12 9- 3 13-15 4-12 29-15 13- 3 27-12 25- 3 10-12 23- 3 7- 3 23-18 MEAN QNH PRESSURE IN HPA 1018.3 1015.7 1010.9 1014.9 1014.4 1011.0 1008.8 1009.6 1014.0 1016.4 1018.5 1017.3 1014.2 MAX. QNH PRESSURE IN HPA 1025.0 1024.7 1016.6 1022.5 1019.5 1015.9 1012.3 1014.6 1019.7 1021.5 1023.7 1024.8 1025.0 DAY-HOUR 17- 6 1- 6 31-18 22- 9 4-12 29- 6 30- 6 6- 6 25- 6 14- 6 30-18 2- 6 MIN. QNH PRESSURE IN HPA 1005.0 1007.8 1001.2 1006.5 1009.7 1006.0 1004.0 1006.0 1010.2 1010.0 1011.5 1006.7 1001.2 DAY-HOUR 6-12 9- 3 13-15 4-12 29-15 13- 3 27-12 25- 3 10-12 23- 3 7- 3 23-18 MEAN QFF PRESSURE IN HPA ****** ****** 1010.5 1010.6 1005.4 999.9 996.5 ****** 1004.1 1010.5 1015.9 1018.1 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1015.8 1019.1 1012.1 1004.6 1001.4 ****** 1010.8 1018.0 1023.7 1026.0 ****** DAY-HOUR **-** **-** 31-18 22- 6 13- 3 3-15 10- 3 **-** 30- 6 31- 6 30-18 2- 6 MIN. QFF PRESSURE IN HPA ****** ****** 1000.8 1001.9 999.2 995.7 990.4 ****** 999.4 1002.2 1007.0 1005.1 ****** DAY-HOUR **-** **-** 13-15 19- 3 29-18 12- 6 26-15 **-** 10- 3 4- 6 7- 3 23-18 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 868.3 864.8 860.5 864.0 863.5 860.6 858.8 859.4 863.1 865.3 867.1 866.3 863.5 MAX. QFE PRESSURE IN HPA 872.2 871.9 864.5 869.7 867.5 864.7 861.6 863.5 868.1 869.1 870.0 872.5 872.5 DAY 17 1 24 22 13 29 30 6 26 15 23 2 MIN. QFE PRESSURE IN HPA 862.2 858.1 853.4 858.2 860.4 856.5 855.3 856.5 860.6 860.0 861.3 858.6 853.4 DAY 24 9 14 5 22 13 27 25 10 23 7 24 MEAN QNH PRESSURE IN HPA 1019.5 1015.5 1010.5 1014.6 1014.0 1010.7 1008.6 1009.3 1013.5 1016.1 1018.1 1017.2 1014.0 MAX. QNH PRESSURE IN HPA 1023.9 1023.6 1015.1 1021.0 1018.5 1015.4 1011.8 1014.0 1019.2 1020.4 1021.4 1024.2 1024.2 DAY 17 1 24 22 13 29 30 6 26 15 23 2 MIN. QNH PRESSURE IN HPA 1012.5 1007.8 1002.5 1007.9 1010.5 1006.0 1004.6 1006.0 1010.7 1010.0 1011.5 1008.4 1002.5 DAY 24 9 14 5 22 13 27 25 10 23 7 24 MEAN QFF PRESSURE IN HPA 1019.5 1014.8 1010.3 1010.6 1005.5 1000.0 996.5 997.9 1003.9 1010.3 1015.7 1017.9 1008.6 MAX. QFF PRESSURE IN HPA 1023.9 1022.2 1014.7 1018.4 1012.1 1004.6 1001.4 1001.2 1010.0 1016.0 1020.7 1025.4 1025.4 DAY 28 1 22 22 13 1 10 5 30 14 30 2 MIN. QFF PRESSURE IN HPA 1011.3 1007.6 1001.5 1001.9 1001.0 996.9 990.9 995.5 999.4 1002.7 1007.0 1005.8 990.9 DAY 24 9 4 19 30 13 27 21 10 4 7 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 867.8 865.8 861.3 864.9 864.3 861.1 859.2 859.9 864.0 866.3 868.1 867.2 864.2 MAX. QFE PRESSURE IN HPA 873.2 872.9 865.6 870.7 867.7 865.2 862.0 864.0 868.5 870.1 871.0 873.0 873.2 DAY 17 1 7 22 13 29 30 6 25 14 30 2 MIN. QFE PRESSURE IN HPA 858.5 859.9 855.1 858.6 860.7 856.9 856.0 857.0 861.1 862.0 862.8 859.0 855.1 DAY 6 9 14 4 30 12 27 25 10 4 7 23 MEAN QNH PRESSURE IN HPA 1018.9 1016.6 1011.4 1015.5 1014.8 1011.3 1009.1 1009.9 1014.6 1017.2 1019.2 1018.2 1014.7 MAX. QNH PRESSURE IN HPA 1025.0 1024.7 1016.4 1022.2 1018.8 1015.9 1012.3 1014.6 1019.7 1021.5 1022.5 1024.8 1025.0 DAY 17 1 7 22 13 29 30 6 25 14 30 2 MIN. QNH PRESSURE IN HPA 1008.3 1009.9 1004.4 1008.4 1010.8 1006.5 1005.4 1006.6 1011.3 1012.3 1013.2 1008.9 1004.4 DAY 6 9 14 4 30 12 27 25 10 4 7 23 MEAN QFF PRESSURE IN HPA ****** ****** 1010.8 1011.1 1005.7 999.9 996.6 997.7 1004.3 1011.0 1016.3 1018.7 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1015.3 1019.1 1011.2 1003.8 1000.5 1000.7 1010.8 1018.0 1022.8 1026.0 ****** DAY ** ** 15 22 13 3 9 6 30 31 30 2 MIN. QFF PRESSURE IN HPA ****** ****** 1002.4 1003.3 1000.5 995.7 992.0 995.0 999.8 1002.2 1008.7 1006.3 ****** DAY ** ** 4 19 30 12 27 25 10 4 7 23 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 867.6 865.6 861.1 864.8 864.4 861.1 859.2 859.9 863.8 866.1 867.6 866.7 864.0 MAX. QFE PRESSURE IN HPA 873.2 872.8 865.6 871.0 867.8 865.1 861.9 863.7 868.5 870.0 870.5 873.0 873.2 DAY 17 1 7 22 12 3 30 6 26 1 30 2 MIN. QFE PRESSURE IN HPA 856.3 859.8 854.2 858.0 860.7 857.3 855.8 857.1 860.7 861.9 862.5 859.5 854.2 DAY 6 9 13 4 30 12 27 25 10 4 7 23 MEAN QNH PRESSURE IN HPA 1018.7 1016.4 1011.3 1015.5 1015.0 1011.3 1009.1 1009.9 1014.4 1017.0 1018.7 1017.6 1014.6 MAX. QNH PRESSURE IN HPA 1025.0 1024.6 1016.4 1022.5 1018.9 1015.8 1012.2 1014.2 1019.7 1021.4 1022.0 1024.8 1025.0 DAY 17 1 7 22 12 3 30 6 26 1 30 2 MIN. QNH PRESSURE IN HPA 1005.8 1009.8 1003.4 1007.7 1010.8 1006.9 1005.2 1006.7 1010.8 1012.2 1012.8 1009.4 1003.4 DAY 6 9 13 4 30 12 27 25 10 4 7 23 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 866.3 864.4 860.3 864.1 863.9 860.7 858.7 859.3 863.1 865.3 867.0 865.8 863.2 MAX. QFE PRESSURE IN HPA 871.9 870.6 864.7 869.3 868.3 864.5 860.8 863.5 868.0 868.8 870.2 872.0 872.0 DAY 17 1 7 22 4 3 9 6 26 1 30 1 MIN. QFE PRESSURE IN HPA 855.6 858.7 852.5 856.9 860.0 857.2 854.7 856.9 860.2 861.0 862.6 858.8 852.5 DAY 6 9 13 4 21 12 27 25 10 4 7 23 MEAN QNH PRESSURE IN HPA 1017.2 1015.0 1010.3 1014.6 1014.5 1010.8 1008.5 1009.2 1013.5 1016.0 1018.0 1016.6 1013.7 MAX. QNH PRESSURE IN HPA 1023.6 1022.1 1015.4 1020.6 1019.5 1015.1 1010.9 1014.0 1019.1 1020.0 1021.6 1023.7 1023.7 DAY 17 1 7 22 4 3 9 6 26 1 30 1 MIN. QNH PRESSURE IN HPA 1005.0 1008.5 1001.5 1006.5 1010.0 1006.8 1004.0 1006.5 1010.2 1011.1 1013.0 1008.6 1001.5 DAY 6 9 13 4 21 12 27 25 10 4 7 23 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 866.9 864.7 860.5 863.8 863.5 860.4 858.6 859.4 863.1 865.3 867.3 866.2 863.3 MAX. QFE PRESSURE IN HPA 872.5 870.9 864.8 868.6 867.0 863.9 860.9 863.6 867.6 868.8 871.0 871.8 872.5 DAY 17 1 6 21 12 3 31 6 26 1 30 1 MIN. QFE PRESSURE IN HPA 856.4 859.2 852.3 857.5 859.7 857.1 854.9 857.2 860.6 861.5 863.5 858.3 852.3 DAY 6 9 13 4 29 12 26 25 1 4 25 23 MEAN QNH PRESSURE IN HPA 1017.8 1015.3 1010.6 1014.3 1013.9 1010.5 1008.4 1009.3 1013.6 1016.0 1018.3 1017.0 1013.8 MAX. QNH PRESSURE IN HPA 1024.2 1022.4 1015.5 1019.8 1018.0 1014.4 1011.0 1014.1 1018.7 1020.0 1022.5 1023.4 1024.2 DAY 17 1 6 21 12 3 31 6 26 1 30 1 MIN. QNH PRESSURE IN HPA 1005.9 1009.1 1001.2 1007.2 1009.7 1006.7 1004.2 1006.8 1010.7 1011.7 1014.0 1008.1 1001.2 DAY 6 9 13 4 29 12 26 25 1 4 25 23 MEAN QFF PRESSURE IN HPA 1019.3 1014.6 1010.2 1010.1 1005.4 999.8 996.3 997.7 1004.0 1010.3 1015.9 1017.8 1008.4 MAX. QFF PRESSURE IN HPA 1024.2 1022.1 1014.8 1018.6 1010.5 1004.6 1000.6 1001.0 1010.4 1016.4 1022.3 1024.4 1024.4 DAY 28 11 31 21 4 3 9 31 30 31 30 2 MIN. QFF PRESSURE IN HPA 1009.7 1008.3 1000.8 1003.4 999.8 997.0 990.4 994.8 999.4 1003.4 1011.1 1005.6 990.4 DAY 23 17 13 18 29 18 26 13 11 4 7 23 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 861.2 864.6 863.8 861.1 859.3 860.1 863.9 865.7 867.7 866.5 ****** MAX. QFE PRESSURE IN HPA ****** ****** 865.8 869.5 867.5 864.8 861.8 863.8 868.2 869.8 872.0 872.5 ****** DAY ** ** 31 21 16 28 9 6 30 1 30 1 MIN. QFE PRESSURE IN HPA ****** ****** 853.0 858.5 859.7 857.4 855.2 857.8 861.1 861.6 863.5 857.1 ****** DAY ** ** 13 4 29 12 26 24 10 11 25 23 MEAN QNH PRESSURE IN HPA ****** ****** 1011.4 1015.2 1014.3 1011.3 1009.2 1010.1 1014.5 1016.5 1018.7 1017.4 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1016.6 1020.8 1018.5 1015.5 1012.0 1014.3 1019.3 1021.2 1023.7 1024.2 ****** DAY ** ** 31 21 16 28 9 6 30 1 30 1 MIN. QNH PRESSURE IN HPA ****** ****** 1002.0 1008.3 1009.7 1007.0 1004.5 1007.5 1011.3 1011.8 1014.0 1006.7 ****** DAY ** ** 13 4 29 12 26 24 10 11 25 23 MEAN QFF PRESSURE IN HPA ****** ****** 1010.7 1010.6 1005.2 999.8 996.7 997.8 1004.3 1010.4 1015.8 1017.9 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1015.8 1018.7 1011.6 1003.5 1001.0 1001.3 1010.7 1016.8 1023.7 1024.2 ****** DAY ** ** 31 21 12 1 9 31 30 31 30 1 MIN. QFF PRESSURE IN HPA ****** ****** 1002.0 1003.2 999.2 996.4 990.9 995.1 999.6 1002.3 1009.0 1005.1 ****** DAY ** ** 13 18 29 12 26 13 11 3 6 23 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 ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.3 5.2 9.4 15.5 22.5 26.8 31.1 29.7 26.3 20.5 11.9 6.8 17.5 MINIMUN AIR TEMPERATURE (C) 0.8 0.8 5.3 9.2 14.4 18.6 22.0 20.9 18.0 14.2 6.5 2.3 11.1 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 4 26 14 2 0 0 0 46 DAYS WITH MINIMUM TEMP. <=-4 1 0 0 0 0 0 0 0 0 0 0 4 5 DAYS WITH FREEZING MIN.<= 0 15 13 1 0 0 0 0 0 0 0 2 7 38 TEMPERATURE RECORDS LOWEST(C) -5.4 -2.2 -3.0 3.4 6.5 16.0 19.8 15.0 14.4 6.6 -2.0 -12.0 -12.0 DAY 20 25 6 1 4 2 1 31 13 31 14 29 MAXIMUM AIR TEMPERATURE (C) 8.4 9.4 13.2 19.9 27.2 32.0 36.6 35.5 31.7 25.1 16.5 11.1 22.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 11 24 31 30 27 0 0 0 123 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 2 2 TEMPERATURE RECORDS HIGHEST(C) 13.8 14.4 19.2 25.4 32.0 39.0 39.4 39.0 36.0 29.6 22.3 20.6 39.4 DAY 11 27 30 19 23 13 31 1 15 1 7 5 DIF. BETWEEN (MAX.-MIN.) (C) 7.6 8.6 7.9 10.7 12.8 13.4 14.6 14.6 13.7 10.9 10.0 8.8 11.1 MEAN DAILY TEMP. (MDT) (C) 4.6 5.1 9.3 14.5 20.8 25.3 29.3 28.2 24.8 19.6 11.5 6.7 16.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 40.9 128.7 256.5 223.8 115.0 14.4 0.0 0.0 779.4 HEATING DEG. DAYS(BASE 18 0C) 415.8 374.1 262.4 104.4 14.5 0.0 0.0 0.0 0.0 16.3 194.9 350.5 1732.8 DEWPOINT (MEAN C) -1.4 -0.2 0.9 2.9 2.1 -1.5 4.0 5.6 1.1 2.4 -2.2 -2.1 1.0 MIXING RATIO (G/KG) 4.13 4.51 4.85 5.96 5.32 4.13 6.17 6.88 4.95 5.52 4.21 4.03 5.06 VAPOUR PRESSURE (HPA) 5.71 6.21 6.66 8.18 7.31 5.67 8.41 9.39 6.81 7.60 5.82 5.55 6.94 SATURATION DEF. (HPA) 2.79 2.82 5.42 9.97 20.95 30.84 37.94 33.61 28.31 17.22 8.79 5.02 16.97 RELATIVE HUMIDITY (MEAN %) 69 71 59 46 28 17 19 24 20 33 41 59 41 RELATIVE HUMIDITY (MAX. %) 84 86 76 62 41 25 29 37 28 46 58 72 54 RELATIVE HUMIDITY (MIN. %) 52 52 44 34 19 11 13 15 14 23 28 44 29 RELATIVE HUMIDITY (MEAN% 03UTC) 74 81 73 53 39 23 28 34 27 42 49 67 49 RELATIVE HUMIDITY (MEAN% 09UTC) 58 64 50 37 22 13 15 18 16 27 30 50 33 RELATIVE HUMIDITY (MEAN% 15UTC) 74 69 56 46 25 16 17 19 19 34 43 62 40 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 82.3 128.4 101.4 53.3 2.4 0.0 0.0 0.0 0.0 11.6 14.0 154.2 547.6 DAYS WITH PRECIPITATION >=10 3 6 3 2 0 0 0 0 0 0 0 4 18 DAYS WITH PRECIPITATION >= 5 6 11 6 3 0 0 0 0 0 1 1 7 35 DAYS WITH PRECIPITATION >= 1 13 15 8 8 1 0 0 0 0 3 3 8 59 DAYS WITH PRECIPITATION 15 15 10 12 2 0 0 0 0 6 11 10 81 GREATEST DAILY PRECIPITATION 18.0 19.0 48.0 19.0 2.0 0.0 0.0 0.0 0.0 7.2 5.0 48.0 48.0 DAY 18 9 3 25 1 ** ** ** ** 15 9 17 DAY WITH THUNDER STORM 3 6 2 7 1 1 0 0 1 5 4 1 31 DAYS WITH SNOW OR SLEET 5 5 0 0 0 0 0 0 0 0 0 3 13 DAYS WITH DUST 0 0 2 2 2 3 2 0 3 2 3 0 19 WIND DIRECTION (PREVAILING) 180 225 270 180 270 225 270 270 270 180 180 90 270 PREVAILING WIND SPEED(KNOTS) 5.7 8.9 10.4 9.1 8.8 7.0 7.3 8.5 7.9 9.2 8.2 5.0 8.3 PREVAILING WIND PERCENT 10.8 11.5 15.6 12.2 14.1 15.0 23.7 16.7 19.4 13.7 25.6 19.4 12.2 CALMS PERCENT OF WIND 69.4 69.0 60.8 47.8 49.7 49.4 36.0 52.2 35.6 34.1 26.7 44.6 47.9 NO. OF WIND OBSERVATION 186 174 186 180 185 180 186 186 180 182 180 186 2191 VECTOR WIND DIRECTION (MEAN) 182 219 238 197 261 260 267 236 296 212 175 139 232 VECTOR WIND MAGNITUDE(KNOTS) 0.9 1.8 2.7 1.5 2.0 2.0 2.3 2.1 2.8 0.7 2.6 1.9 1.4 WIND STEADINESES (MEAN %) 52.9 69.2 69.2 34.1 47.6 51.3 52.3 55.3 57.1 13.0 54.2 57.6 35.0 WIND SPEED (MEAN KNOTS) 1.7 2.6 3.9 4.4 4.2 3.9 4.4 3.8 4.9 5.4 4.8 3.3 4.0 FASTEST WIND DIRECTION 170 150 180 290 190 360 270 260 300 320 150 150 150 FASTEST WIND SPEED (KNOTS) 17 19 17 17 19 19 16 19 27 21 19 39 39 DAY 7 1 24 11 21 17 6 16 28 7 19 25 DAYS WITH SKY CLEAR (0-2)/8 9 9 15 7 25 27 31 29 29 17 10 8 216 DAYS WITH P.CLOUDY (3-6)/8 13 9 9 14 5 3 0 2 1 12 13 10 91 DAYS WITH CLOUDY (7-8)/8 9 11 7 9 1 0 0 0 0 2 7 13 59 DAYS WITH VISIBILITY =< 2 KM 0 1 1 0 0 0 0 0 0 0 0 3 5 DURATION OF SUNSHINE HOURS 161.6 135.3 215.7 220.8 342.3 370.5 384.6 348.1 310.5 253.8 167.5 143.3 3054.0 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 864.7 863.0 862.1 863.0 863.3 860.2 856.5 858.1 862.5 865.9 866.5 864.4 862.5 MAX. QFE PRESSURE IN HPA 870.7 869.7 868.0 869.3 866.9 864.5 861.5 861.7 866.9 870.7 871.9 872.2 872.2 DAY-HOUR 3- 9 20- 6 15- 9 8- 6 8- 6 12- 9 30- 6 31-18 15- 9 28- 6 4-18 3- 6 MIN. QFE PRESSURE IN HPA 859.7 852.9 854.4 854.1 859.7 854.0 852.8 853.7 858.6 861.3 859.8 851.0 851.0 DAY-HOUR 18- 3 2- 3 8-12 25-15 1- 3 30-15 18-12 2-15 2-15 30-12 19-12 27- 3 MEAN QNH PRESSURE IN HPA 1015.4 1013.5 1012.4 1013.5 1013.8 1010.3 1006.0 1007.9 1012.8 1016.7 1017.4 1015.1 1012.9 MAX. QNH PRESSURE IN HPA 1022.2 1021.0 1019.1 1020.6 1017.9 1015.1 1011.7 1011.9 1017.9 1022.2 1023.6 1023.9 1023.9 DAY-HOUR 3- 9 20- 6 15- 9 8- 6 8- 6 12- 9 30- 6 31-18 15- 9 28- 6 4-18 3- 6 MIN. QNH PRESSURE IN HPA 1009.7 1001.9 1003.6 1003.3 1009.7 1003.2 1001.8 1002.8 1008.4 1011.5 1009.8 999.7 999.7 DAY-HOUR 18- 3 2- 3 8-12 25-15 1- 3 30-15 18-12 2-15 2-15 30-12 19-12 27- 3 MEAN QFF PRESSURE IN HPA 1017.1 ****** 1010.9 1008.7 1005.6 999.9 993.4 995.9 1002.9 ****** 1015.2 1015.5 ****** MAX. QFF PRESSURE IN HPA 1024.8 ****** 1017.4 1017.4 1012.3 1004.3 999.0 1003.3 1007.8 ****** 1022.9 1030.4 ****** DAY-HOUR 20- 6 **-** 6- 6 8- 6 4- 3 18-18 30- 6 31-18 14- 6 **-** 15- 6 29- 6 MIN. QFF PRESSURE IN HPA 1010.6 ****** 1002.0 997.2 1000.2 991.4 989.2 990.2 997.4 ****** 1006.0 1000.0 ****** DAY-HOUR 26- 3 **-** 26-15 25-15 18- 3 30- 6 16- 6 2-18 2-15 **-** 19-15 26- 3 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 864.4 862.7 861.6 862.7 862.9 860.0 856.2 858.0 862.2 865.7 866.3 864.1 862.2 MAX. QFE PRESSURE IN HPA 869.5 868.5 867.0 867.9 865.7 863.0 860.6 860.5 866.4 869.6 871.0 870.8 871.0 DAY 3 20 16 8 8 12 31 21 15 28 6 3 MIN. QFE PRESSURE IN HPA 859.7 852.9 857.4 856.4 859.7 854.1 853.0 855.9 858.9 862.1 862.1 851.0 851.0 DAY 18 2 3 26 1 30 16 2 3 2 28 27 MEAN QNH PRESSURE IN HPA 1015.0 1013.1 1011.9 1013.1 1013.3 1010.0 1005.6 1007.7 1012.5 1016.4 1017.1 1014.7 1012.5 MAX. QNH PRESSURE IN HPA 1020.8 1019.7 1018.0 1019.0 1016.5 1013.4 1010.7 1010.6 1017.3 1020.9 1022.5 1022.3 1022.5 DAY 3 20 16 8 8 12 31 21 15 28 6 3 MIN. QNH PRESSURE IN HPA 1009.7 1001.9 1007.0 1005.9 1009.7 1003.3 1002.0 1005.3 1008.7 1012.4 1012.4 999.7 999.7 DAY 18 2 3 26 1 30 16 2 3 2 28 27 MEAN QFF PRESSURE IN HPA 1016.7 1014.2 1010.4 1008.8 1005.5 999.9 993.4 996.0 1002.9 1009.6 1015.0 1015.1 1007.3 MAX. QFF PRESSURE IN HPA 1023.6 1021.5 1016.8 1015.6 1012.3 1003.8 998.6 1002.5 1007.4 1015.6 1022.5 1029.3 1029.3 DAY 20 5 6 8 4 1 12 31 25 22 15 29 MIN. QFF PRESSURE IN HPA 1010.6 1000.4 1004.7 999.6 1000.2 991.8 989.6 992.6 998.3 1002.9 1007.9 1000.0 989.6 DAY 26 2 27 25 18 30 16 2 17 1 19 26 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 865.4 863.7 862.4 863.6 863.6 860.5 856.8 858.4 863.0 866.6 867.2 865.1 863.0 MAX. QFE PRESSURE IN HPA 870.3 869.7 867.3 869.3 866.9 864.0 861.5 860.9 866.7 870.7 871.9 872.2 872.2 DAY 4 20 17 8 8 12 30 31 14 28 6 3 MIN. QFE PRESSURE IN HPA 860.3 854.8 857.4 857.0 860.8 854.4 853.3 855.3 859.4 862.4 862.6 852.2 852.2 DAY 18 2 4 25 1 30 18 3 3 30 28 26 MEAN QNH PRESSURE IN HPA 1016.1 1014.3 1012.7 1014.1 1014.1 1010.6 1006.3 1008.2 1013.4 1017.6 1018.2 1015.8 1013.4 MAX. QNH PRESSURE IN HPA 1021.7 1021.0 1018.3 1020.6 1017.9 1014.6 1011.7 1011.0 1017.6 1022.2 1023.6 1023.9 1023.9 DAY 4 20 17 8 8 12 30 31 14 28 6 3 MIN. QNH PRESSURE IN HPA 1010.3 1004.1 1007.0 1006.6 1010.9 1003.6 1002.4 1004.6 1009.3 1012.7 1013.0 1001.1 1001.1 DAY 18 2 4 25 1 30 18 3 3 30 28 26 MEAN QFF PRESSURE IN HPA 1017.9 1015.1 1011.1 1009.3 1005.8 1000.1 993.3 995.7 1003.1 1009.7 1015.5 1016.1 1007.7 MAX. QFF PRESSURE IN HPA 1024.8 1022.7 1017.4 1017.4 1011.7 1003.8 999.0 1002.5 1007.8 1016.8 1022.9 1030.4 1030.4 DAY 20 20 6 8 4 3 30 31 14 22 15 29 MIN. QFF PRESSURE IN HPA 1011.7 1002.5 1005.2 999.3 1000.5 991.4 989.2 990.7 998.5 1003.2 1008.2 1000.8 989.2 DAY 26 2 4 25 18 30 16 3 17 1 19 26 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.1 863.5 862.4 863.6 863.7 860.6 856.8 858.2 862.9 866.2 866.7 864.8 862.9 MAX. QFE PRESSURE IN HPA 870.7 869.0 868.0 869.3 866.6 864.5 861.2 861.4 866.9 869.9 871.0 871.5 871.5 DAY 3 20 15 8 8 12 31 31 15 28 5 3 MIN. QFE PRESSURE IN HPA 860.2 855.5 856.5 856.9 861.0 855.0 853.3 855.2 859.5 862.4 861.1 852.2 852.2 DAY 26 2 4 25 18 30 18 25 3 1 19 26 MEAN QNH PRESSURE IN HPA 1015.8 1014.0 1012.8 1014.0 1014.2 1010.7 1006.3 1008.0 1013.3 1017.1 1017.6 1015.4 1013.3 MAX. QNH PRESSURE IN HPA 1022.2 1020.3 1019.1 1020.6 1017.5 1015.1 1011.4 1011.6 1017.9 1021.3 1022.5 1023.1 1023.1 DAY 3 20 15 8 8 12 31 31 15 28 5 3 MIN. QNH PRESSURE IN HPA 1010.2 1004.9 1006.0 1006.5 1011.1 1004.3 1002.4 1004.5 1009.4 1012.7 1011.3 1001.1 1001.1 DAY 26 2 4 25 18 30 18 25 3 1 19 26 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 864.2 862.5 861.6 862.9 863.1 860.1 856.3 857.9 862.0 865.4 865.9 863.8 862.1 MAX. QFE PRESSURE IN HPA 869.8 868.0 866.4 868.0 866.4 864.0 860.8 861.1 866.0 869.0 870.5 870.1 870.5 DAY 3 26 16 8 8 12 30 31 14 28 6 2 MIN. QFE PRESSURE IN HPA 860.0 855.6 854.4 855.2 860.5 855.0 852.8 854.1 858.8 861.3 859.8 851.5 851.5 DAY 18 16 8 25 18 30 18 25 3 30 19 26 MEAN QNH PRESSURE IN HPA 1014.8 1012.8 1011.9 1013.3 1013.6 1010.1 1005.8 1007.6 1012.3 1016.1 1016.7 1014.3 1012.4 MAX. QNH PRESSURE IN HPA 1021.2 1019.1 1017.3 1019.1 1017.3 1014.6 1010.9 1011.3 1016.8 1020.3 1022.0 1021.5 1022.0 DAY 3 26 16 8 8 12 30 31 14 28 6 2 MIN. QNH PRESSURE IN HPA 1010.0 1005.0 1003.6 1004.5 1010.6 1004.3 1001.8 1003.3 1008.6 1011.5 1009.8 1000.3 1000.3 DAY 18 16 8 25 18 30 18 25 3 30 19 26 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 864.4 862.7 861.9 862.4 862.8 859.8 856.1 857.9 862.1 865.7 866.3 864.2 862.2 MAX. QFE PRESSURE IN HPA 869.8 868.4 866.7 867.2 865.8 863.0 860.4 860.8 866.0 869.2 871.0 870.2 871.0 DAY 3 26 16 11 3 12 30 31 14 28 5 3 MIN. QFE PRESSURE IN HPA 859.8 854.9 855.1 854.1 860.5 854.0 852.8 853.7 858.6 861.6 860.0 851.9 851.9 DAY 18 16 8 25 18 30 18 2 2 30 19 25 MEAN QNH PRESSURE IN HPA 1015.0 1013.1 1012.2 1012.7 1013.2 1009.7 1005.5 1007.6 1012.4 1016.5 1017.1 1014.8 1012.5 MAX. QNH PRESSURE IN HPA 1021.2 1019.6 1017.6 1018.2 1016.6 1013.4 1010.5 1010.9 1016.8 1020.5 1022.5 1021.6 1022.5 DAY 3 26 16 11 3 12 30 31 14 28 5 3 MIN. QNH PRESSURE IN HPA 1009.8 1004.2 1004.4 1003.3 1010.6 1003.2 1001.8 1002.8 1008.4 1011.8 1010.0 1000.8 1000.8 DAY 18 16 8 25 18 30 18 2 2 30 19 25 MEAN QFF PRESSURE IN HPA 1016.7 1014.1 1010.7 1008.2 1005.3 999.5 993.2 996.0 1002.6 1009.7 1015.1 1015.2 1007.2 MAX. QFF PRESSURE IN HPA 1023.7 1021.4 1017.0 1014.7 1012.0 1003.7 997.9 1002.7 1006.5 1015.1 1022.5 1028.5 1028.5 DAY 2 26 6 8 4 3 30 31 14 23 14 29 MIN. QFF PRESSURE IN HPA 1011.7 1003.9 1002.0 997.2 1000.3 991.8 989.9 990.2 997.4 1002.7 1006.0 1000.6 989.9 DAY 25 16 26 25 17 30 16 2 2 1 19 25 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 865.0 863.1 862.5 863.2 863.7 860.5 857.1 858.5 862.9 865.9 866.8 864.8 862.8 MAX. QFE PRESSURE IN HPA 870.1 868.4 867.2 867.7 866.6 864.0 861.4 861.7 866.3 869.4 871.9 871.0 871.9 DAY 3 26 15 8 3 12 30 31 14 27 4 2 MIN. QFE PRESSURE IN HPA 860.1 855.2 855.1 857.8 861.5 854.7 853.8 854.9 859.5 862.3 861.5 852.7 852.7 DAY 15 1 8 24 31 30 18 2 16 30 19 25 MEAN QNH PRESSURE IN HPA 1015.7 1013.6 1012.8 1013.6 1014.3 1010.6 1006.6 1008.3 1013.3 1016.8 1017.7 1015.5 1013.2 MAX. QNH PRESSURE IN HPA 1021.5 1019.6 1018.2 1018.8 1017.5 1014.6 1011.6 1011.9 1017.2 1020.7 1023.6 1022.5 1023.6 DAY 3 26 15 8 3 12 30 31 14 27 4 2 MIN. QNH PRESSURE IN HPA 1010.1 1004.5 1004.4 1007.5 1011.7 1004.0 1002.9 1004.2 1009.4 1012.6 1011.7 1001.7 1001.7 DAY 15 1 8 24 31 30 18 2 16 30 19 25 MEAN QFF PRESSURE IN HPA 1017.3 1014.4 1011.3 1008.6 1005.8 1000.0 993.6 995.9 1002.9 1009.4 1015.1 1015.7 1007.5 MAX. QFF PRESSURE IN HPA 1024.6 1021.1 1016.9 1015.4 1012.2 1004.3 998.3 1003.3 1007.0 1014.9 1022.3 1028.4 1028.4 DAY 2 26 15 8 3 18 30 31 13 22 14 29 MIN. QFF PRESSURE IN HPA 1011.0 1002.7 1002.4 1000.9 1002.0 991.9 989.4 990.2 998.4 1003.7 1007.3 1001.2 989.4 DAY 6 1 26 24 23 30 18 2 16 1 19 25 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 ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 1.5 2.7 8.6 16.2 21.7 26.5 30.9 29.1 24.2 19.9 10.9 5.9 16.5 MINIMUN AIR TEMPERATURE (C) -3.0 -1.1 4.4 10.8 16.1 19.4 23.9 22.2 17.8 14.7 6.8 2.1 11.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 7 30 22 5 0 0 0 65 DAYS WITH MINIMUM TEMP. <=-4 11 4 1 0 0 0 0 0 0 0 0 0 16 DAYS WITH FREEZING MIN.<= 0 28 16 3 0 0 0 0 0 0 0 0 6 53 TEMPERATURE RECORDS LOWEST(C) -9.0 -9.2 -4.4 1.0 10.4 15.4 20.8 19.0 13.0 8.2 1.4 -3.0 -9.2 DAY 17 15 30 1 9 2 13 12 29 22 21 7 MAXIMUM AIR TEMPERATURE (C) 5.8 7.6 13.8 22.1 27.4 33.0 37.7 35.8 30.9 25.7 15.8 10.7 22.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 9 26 31 31 15 2 0 0 114 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 9.6 17.0 22.2 27.4 33.0 37.8 40.6 38.2 36.4 31.8 20.8 15.2 40.6 DAY 19 28 7 16 24 27 20 26 2 6 4 24 DIF. BETWEEN (MAX.-MIN.) (C) 8.8 8.7 9.4 11.3 11.3 13.6 13.8 13.6 13.1 11.0 9.0 8.6 11.0 MEAN DAILY TEMP. (MDT) (C) 1.4 3.3 9.1 16.4 21.8 26.2 30.8 29.0 24.3 20.2 11.3 6.4 16.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 49.2 156.7 303.6 247.1 98.7 28.1 0.0 0.0 883.4 HEATING DEG. DAYS(BASE 18 0C) 515.8 412.7 275.5 60.2 5.4 0.0 0.0 0.0 0.0 18.5 201.4 359.1 1848.6 DEWPOINT (MEAN C) -2.8 -4.9 1.8 3.0 -0.1 -2.3 -0.6 0.1 -1.4 1.2 3.6 -0.5 -0.2 MIXING RATIO (G/KG) 3.69 3.31 5.19 5.71 4.66 3.85 4.36 4.71 4.12 5.02 5.95 4.44 4.58 VAPOUR PRESSURE (HPA) 5.08 4.56 7.11 7.86 6.41 5.29 5.98 6.46 5.68 6.94 8.22 6.13 6.31 SATURATION DEF. (HPA) 1.87 3.18 4.52 11.29 20.57 30.73 40.04 35.22 25.78 17.16 5.12 3.37 16.57 RELATIVE HUMIDITY (MEAN %) 75 63 66 44 27 16 14 17 20 32 64 67 42 RELATIVE HUMIDITY (MAX. %) 90 80 83 62 41 25 22 27 29 43 81 83 56 RELATIVE HUMIDITY (MIN. %) 59 45 44 27 17 10 8 9 12 21 45 45 29 RELATIVE HUMIDITY (MEAN% 03UTC) 84 66 71 52 35 23 18 23 24 36 71 73 48 RELATIVE HUMIDITY (MEAN% 09UTC) 63 54 51 29 20 11 10 11 13 24 51 49 32 RELATIVE HUMIDITY (MEAN% 15UTC) 80 62 66 42 21 12 11 12 17 33 66 71 41 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 61.3 83.3 163.6 40.3 17.7 0.0 0.0 0.0 0.0 4.5 125.9 101.3 597.9 DAYS WITH PRECIPITATION >=10 3 4 5 1 1 0 0 0 0 0 3 3 20 DAYS WITH PRECIPITATION >= 5 7 6 13 3 1 0 0 0 0 0 4 4 38 DAYS WITH PRECIPITATION >= 1 8 9 16 7 1 0 0 0 0 2 8 7 58 DAYS WITH PRECIPITATION 9 12 20 9 3 0 0 0 0 3 10 8 74 GREATEST DAILY PRECIPITATION 13.0 27.0 26.0 14.0 17.7 0.0 0.0 0.0 0.0 3.1 55.0 53.8 55.0 DAY 17 13 14 11 7 ** ** ** ** 30 14 1 DAY WITH THUNDER STORM 3 2 7 7 2 0 0 0 0 2 5 3 31 DAYS WITH SNOW OR SLEET 10 6 3 0 0 0 0 0 0 0 0 1 20 DAYS WITH DUST 0 0 0 5 2 5 1 4 3 2 0 0 22 WIND DIRECTION (PREVAILING) 90 90 180 45 270 270 270 270 270 180 90 180 270 PREVAILING WIND SPEED(KNOTS) 5.4 4.6 4.5 5.3 7.3 6.1 4.9 5.3 3.8 5.2 3.4 3.7 5.1 PREVAILING WIND PERCENT 12.3 17.0 19.4 15.5 20.2 23.3 22.2 23.8 20.8 14.1 19.6 10.5 13.6 CALMS PERCENT OF WIND 57.2 37.9 33.1 34.7 21.9 27.5 31.9 39.1 35.4 34.3 42.5 54.8 37.1 NO. OF WIND OBSERVATION 187 224 248 239 247 240 248 248 240 248 240 248 2857 VECTOR WIND DIRECTION (MEAN) 129 88 147 147 327 316 290 302 290 140 132 150 319 VECTOR WIND MAGNITUDE(KNOTS) 1.1 1.6 1.5 0.3 1.3 2.5 0.9 1.8 0.6 0.8 1.1 0.5 0.1 WIND STEADINESES (MEAN %) 57.9 44.4 41.7 9.1 27.1 58.1 32.1 56.2 26.1 27.6 50.0 29.4 3.2 WIND SPEED (MEAN KNOTS) 1.9 3.6 3.6 3.3 4.8 4.3 2.8 3.2 2.3 2.9 2.2 1.7 3.1 FASTEST WIND DIRECTION 100 50 90 230 60 330 30 360 270 140 140 120 60 FASTEST WIND SPEED (KNOTS) 29 23 19 19 35 29 17 19 16 16 29 16 35 DAY 22 4 8 28 1 6 30 28 11 26 30 1 DAYS WITH SKY CLEAR (0-2)/8 16 15 7 13 21 30 30 31 30 21 15 16 245 DAYS WITH P.CLOUDY (3-6)/8 9 5 11 12 7 0 1 0 0 6 8 10 69 DAYS WITH CLOUDY (7-8)/8 6 8 13 5 3 0 0 0 0 4 7 5 51 DAYS WITH VISIBILITY =< 2 KM 5 3 3 1 0 0 0 0 0 0 1 3 16 DURATION OF SUNSHINE HOURS 194.4 183.0 172.6 243.8 324.6 379.2 379.7 362.0 324.2 262.3 196.4 205.0 3227.2 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 861.9 862.8 860.6 864.1 863.5 860.6 858.7 859.7 862.9 866.8 867.8 865.9 862.9 MAX. QFE PRESSURE IN HPA 866.6 867.8 868.9 869.7 866.6 864.6 864.0 863.1 868.5 871.1 871.6 870.7 871.6 DAY-HOUR 18- 9 8- 6 31-21 1- 6 8-18 25- 9 8-21 26-18 24- 6 28- 6 26- 6 18-18 MIN. QFE PRESSURE IN HPA 853.9 854.6 848.0 858.9 860.6 856.7 855.6 854.3 858.8 862.6 863.2 859.8 848.0 DAY-HOUR 11-12 22-15 10-12 23-12 6-21 30- 0 31-15 1-15 6- 0 11-12 14-12 4-12 MEAN QNH PRESSURE IN HPA 1012.1 1013.2 1010.7 1014.7 1014.0 1010.7 1008.5 1009.6 1013.3 1017.8 1018.9 1016.8 1013.3 MAX. QNH PRESSURE IN HPA 1017.5 1018.9 1020.1 1021.0 1017.5 1015.2 1014.6 1013.5 1019.7 1022.6 1023.2 1022.2 1023.2 DAY-HOUR 18- 9 8- 6 31-21 1- 6 8-18 25- 9 8-21 26-18 24- 6 28- 6 26- 6 18-18 MIN. QNH PRESSURE IN HPA 1003.0 1003.8 996.3 1008.7 1010.7 1006.2 1005.0 1003.5 1008.6 1013.0 1013.6 1009.8 996.3 DAY-HOUR 11-12 22-15 10-12 23-12 6-21 30- 0 31-15 1-15 6- 0 11-12 14-12 4-12 MEAN QFF PRESSURE IN HPA 1015.0 1015.1 1008.9 1008.9 1005.4 999.7 995.2 997.2 1003.4 1010.1 1016.0 1016.7 1007.6 MAX. QFF PRESSURE IN HPA 1021.1 1021.8 1022.5 1021.0 1012.7 1005.1 1002.6 1000.8 1010.9 1015.7 1022.4 1023.4 1023.4 DAY-HOUR 18-15 15-15 31- 6 1- 6 8-18 12-21 8-21 26-18 30- 6 22- 3 22- 6 18-18 MIN. QFF PRESSURE IN HPA 1004.5 1004.3 992.0 1001.9 1000.0 993.4 991.3 991.8 997.2 1002.3 1009.8 1008.7 991.3 DAY-HOUR 11-15 22-15 10-12 23-12 30-15 30- 6 31- 0 1-12 6- 0 11-12 11-12 4-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** 862.4 860.1 863.8 863.0 860.2 858.3 859.2 862.4 866.3 867.7 865.9 ****** MAX. QFE PRESSURE IN HPA ****** 866.6 864.6 868.6 865.8 863.2 863.5 861.6 867.0 870.5 870.8 869.8 ****** DAY ** 8 31 1 9 25 9 27 24 28 23 19 MIN. QFE PRESSURE IN HPA ****** 854.9 853.0 859.5 861.0 856.7 855.8 854.6 858.8 862.9 864.2 861.7 ****** DAY ** 11 29 24 7 30 31 2 6 12 15 13 MEAN QNH PRESSURE IN HPA ****** 1012.7 1010.1 1014.3 1013.4 1010.2 1008.0 1009.1 1012.7 1017.2 1018.8 1016.7 ****** MAX. QNH PRESSURE IN HPA ****** 1017.5 1015.2 1019.8 1016.6 1013.6 1014.0 1011.8 1018.0 1022.0 1022.3 1021.2 ****** DAY ** 8 31 1 9 25 9 27 24 28 23 19 MIN. QNH PRESSURE IN HPA ****** 1004.2 1002.0 1009.4 1011.1 1006.2 1005.2 1003.8 1008.6 1013.3 1014.8 1011.9 ****** DAY ** 11 29 24 7 30 31 2 6 12 15 13 MEAN QFF PRESSURE IN HPA ****** 1014.4 1008.0 1008.8 1004.6 999.1 994.7 996.5 1002.5 1009.2 1015.4 1016.3 ****** MAX. QFF PRESSURE IN HPA ****** 1020.7 1018.1 1020.0 1011.4 1004.1 1001.8 999.2 1009.3 1015.0 1020.4 1021.7 ****** DAY ** 4 31 1 9 13 9 31 30 28 22 18 MIN. QFF PRESSURE IN HPA ****** 1005.4 999.0 1002.3 1000.9 993.8 991.3 992.1 997.2 1004.0 1009.9 1011.2 ****** DAY ** 11 10 24 31 30 31 1 6 12 11 13 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 861.6 862.4 860.2 863.9 863.3 860.4 858.4 859.4 862.6 866.6 867.6 865.7 862.7 MAX. QFE PRESSURE IN HPA 865.2 866.6 865.9 868.6 865.8 863.3 863.7 862.0 867.0 870.5 870.4 869.7 870.5 DAY 19 25 31 1 14 13 9 26 24 28 29 19 MIN. QFE PRESSURE IN HPA 857.0 855.6 853.1 859.7 861.1 856.8 855.7 855.0 858.8 863.3 863.6 861.6 853.1 DAY 23 11 29 23 7 30 31 1 6 12 15 4 MEAN QNH PRESSURE IN HPA 1011.8 1012.7 1010.3 1014.4 1013.7 1010.4 1008.2 1009.4 1013.0 1017.5 1018.7 1016.4 1013.0 MAX. QNH PRESSURE IN HPA 1015.9 1017.5 1016.7 1019.8 1016.6 1013.8 1014.2 1012.3 1018.0 1022.0 1021.8 1021.0 1022.0 DAY 19 25 31 1 14 13 9 26 24 28 29 19 MIN. QNH PRESSURE IN HPA 1006.6 1005.0 1002.1 1009.7 1011.3 1006.4 1005.1 1004.3 1008.6 1013.8 1014.1 1011.8 1002.1 DAY 23 11 29 23 7 30 31 1 6 12 15 4 MEAN QFF PRESSURE IN HPA 1015.3 1015.1 1008.9 1009.3 1005.4 999.9 995.3 997.5 1003.6 1010.4 1016.5 1017.0 1007.9 MAX. QFF PRESSURE IN HPA 1019.7 1021.6 1019.1 1020.4 1010.6 1005.0 1002.2 1000.2 1010.3 1015.7 1021.8 1021.7 1021.8 DAY 19 15 31 1 8 13 9 26 30 22 22 19 MIN. QFF PRESSURE IN HPA 1007.9 1007.3 997.2 1003.7 1001.1 994.4 991.4 993.1 998.0 1005.8 1012.5 1010.9 991.4 DAY 11 11 10 23 30 30 31 1 6 11 6 12 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 862.4 863.5 861.3 864.7 864.0 860.9 859.0 860.0 863.5 867.5 868.6 866.6 863.5 MAX. QFE PRESSURE IN HPA 865.6 867.8 868.8 869.7 866.3 864.4 863.6 863.0 868.5 871.1 871.6 870.3 871.6 DAY 30 8 31 1 14 3 9 26 24 28 26 19 MIN. QFE PRESSURE IN HPA 858.0 857.0 853.4 860.3 862.0 857.2 856.1 854.8 859.7 863.8 864.7 861.6 853.4 DAY 11 13 10 23 31 30 31 1 6 12 15 4 MEAN QNH PRESSURE IN HPA 1012.8 1013.9 1011.5 1015.4 1014.6 1011.1 1008.9 1010.1 1013.9 1018.6 1019.7 1017.5 1014.0 MAX. QNH PRESSURE IN HPA 1016.4 1018.9 1020.0 1021.0 1017.2 1015.0 1014.1 1013.4 1019.7 1022.6 1023.2 1021.7 1023.2 DAY 30 8 31 1 14 3 9 26 24 28 26 19 MIN. QNH PRESSURE IN HPA 1007.7 1006.6 1002.5 1010.3 1012.3 1006.8 1005.6 1004.1 1009.7 1014.3 1015.4 1011.8 1002.5 DAY 11 13 10 23 31 30 31 1 6 12 15 4 MEAN QFF PRESSURE IN HPA ****** 1016.3 1009.9 1009.6 1005.8 999.9 995.4 997.5 1003.9 1010.9 1017.1 1017.8 ****** MAX. QFF PRESSURE IN HPA ****** 1021.8 1022.5 1021.0 1012.3 1005.0 1001.7 1000.5 1010.9 1015.5 1022.4 1022.6 ****** DAY ** 15 31 1 8 1 9 26 30 25 22 18 MIN. QFF PRESSURE IN HPA ****** 1008.0 998.8 1004.5 1001.3 993.4 991.9 992.0 998.0 1005.5 1012.5 1010.3 ****** DAY ** 22 10 23 30 30 31 1 6 12 11 4 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 862.3 863.4 861.2 864.5 864.2 861.0 859.1 860.0 863.3 867.3 868.1 866.1 863.4 MAX. QFE PRESSURE IN HPA 866.6 867.7 868.5 869.3 866.2 864.6 863.2 863.0 868.0 870.4 870.7 869.5 870.7 DAY 18 25 31 1 13 25 9 26 24 28 28 18 MIN. QFE PRESSURE IN HPA 855.4 857.2 849.9 860.2 862.0 857.1 856.2 854.9 859.4 863.5 864.2 860.8 849.9 DAY 11 13 10 23 31 30 31 1 6 30 15 4 MEAN QNH PRESSURE IN HPA 1012.6 1013.9 1011.3 1015.2 1014.8 1011.1 1008.9 1010.0 1013.8 1018.3 1019.2 1016.9 1013.8 MAX. QNH PRESSURE IN HPA 1017.5 1018.8 1019.7 1020.6 1017.1 1015.2 1013.6 1013.4 1019.1 1021.8 1022.2 1020.8 1022.2 DAY 18 25 31 1 13 25 9 26 24 28 28 18 MIN. QNH PRESSURE IN HPA 1004.8 1006.8 998.5 1010.2 1012.3 1006.7 1005.7 1004.2 1009.3 1014.0 1014.8 1010.9 998.5 DAY 11 13 10 23 31 30 31 1 6 30 15 4 MEAN QFF PRESSURE IN HPA ****** 1015.5 1009.1 1009.0 1006.0 999.8 995.5 997.2 1003.6 1010.2 1015.9 1016.4 ****** MAX. QFF PRESSURE IN HPA ****** 1021.2 1020.5 1020.1 1012.1 1005.1 1001.7 1000.3 1010.4 1014.7 1021.0 1021.1 ****** DAY ** 15 31 1 8 3 9 26 30 25 22 18 MIN. QFF PRESSURE IN HPA ****** 1007.1 994.4 1003.9 1001.8 993.7 991.8 992.3 997.6 1004.9 1010.4 1009.2 ****** DAY ** 22 10 23 30 30 31 1 6 11 15 12 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 861.2 862.2 860.0 863.8 863.4 860.5 858.5 859.4 862.5 866.3 867.1 865.2 862.5 MAX. QFE PRESSURE IN HPA 865.7 866.4 868.0 868.4 865.7 864.1 862.2 862.6 866.7 869.3 869.7 869.4 869.7 DAY 18 8 31 1 8 25 8 26 24 27 28 18 MIN. QFE PRESSURE IN HPA 853.9 855.2 848.0 858.9 861.2 857.1 855.8 854.6 859.2 862.6 863.2 859.8 848.0 DAY 11 22 10 23 31 30 31 1 6 11 14 4 MEAN QNH PRESSURE IN HPA 1011.4 1012.6 1010.0 1014.3 1013.8 1010.5 1008.3 1009.3 1012.8 1017.2 1018.0 1016.0 1012.8 MAX. QNH PRESSURE IN HPA 1016.5 1017.3 1019.1 1019.6 1016.5 1014.7 1012.5 1013.0 1017.6 1020.6 1021.0 1020.7 1021.0 DAY 18 8 31 1 8 25 8 26 24 27 28 18 MIN. QNH PRESSURE IN HPA 1003.0 1004.5 996.3 1008.7 1011.4 1006.7 1005.2 1003.8 1009.1 1013.0 1013.6 1009.8 996.3 DAY 11 22 10 23 31 30 31 1 6 11 14 4 MEAN QFF PRESSURE IN HPA ****** 1014.1 1007.9 1008.6 1005.0 999.4 995.0 996.7 1002.7 1009.2 1014.7 1015.5 ****** MAX. QFF PRESSURE IN HPA ****** 1019.7 1020.3 1018.7 1009.8 1003.8 1000.5 1000.1 1008.6 1014.6 1019.5 1020.9 ****** DAY ** 15 31 1 9 12 8 26 29 25 21 18 MIN. QFF PRESSURE IN HPA ****** 1005.0 992.0 1001.9 1000.8 994.2 991.8 991.8 997.9 1002.3 1009.8 1008.7 ****** DAY ** 22 10 23 30 30 31 1 6 11 11 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 861.6 862.6 860.2 863.7 863.1 860.4 858.4 859.2 862.6 866.6 867.5 865.8 862.6 MAX. QFE PRESSURE IN HPA 866.4 867.0 867.5 868.4 865.7 863.7 862.2 862.2 866.9 870.1 870.5 870.5 870.5 DAY 18 8 31 1 8 25 8 26 24 27 28 18 MIN. QFE PRESSURE IN HPA 854.2 854.6 851.3 860.2 860.7 857.2 855.6 854.3 859.4 862.6 864.1 860.2 851.3 DAY 11 22 10 23 6 10 31 1 13 30 15 4 MEAN QNH PRESSURE IN HPA 1011.9 1013.0 1010.2 1014.2 1013.5 1010.4 1008.2 1009.1 1012.9 1017.5 1018.6 1016.6 1013.0 MAX. QNH PRESSURE IN HPA 1017.3 1018.0 1018.5 1019.6 1016.5 1014.2 1012.5 1012.5 1017.9 1021.5 1022.0 1022.0 1022.0 DAY 18 8 31 1 8 25 8 26 24 27 28 18 MIN. QNH PRESSURE IN HPA 1003.4 1003.8 1000.1 1010.2 1010.8 1006.8 1005.0 1003.5 1009.3 1013.0 1014.7 1010.2 1000.1 DAY 11 22 10 23 6 10 31 1 13 30 15 4 MEAN QFF PRESSURE IN HPA 1015.3 1015.2 1008.8 1008.8 1005.2 999.8 995.3 997.3 1003.6 1010.4 1016.3 1017.1 1007.8 MAX. QFF PRESSURE IN HPA 1021.1 1021.8 1019.4 1019.2 1011.6 1003.9 1000.3 1000.2 1009.4 1015.6 1021.9 1023.0 1023.0 DAY 18 15 31 1 8 12 8 26 30 22 21 18 MIN. QFF PRESSURE IN HPA 1004.5 1004.3 997.0 1004.5 1000.0 994.8 991.8 992.6 998.8 1003.9 1011.6 1009.0 991.8 DAY 11 22 10 22 30 30 31 1 1 11 11 12 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** 863.1 861.0 864.3 863.9 861.0 859.1 860.1 863.4 867.2 868.0 866.2 ****** MAX. QFE PRESSURE IN HPA ****** 866.8 868.5 868.9 866.6 864.4 863.3 863.1 867.3 870.6 871.0 870.7 ****** DAY ** 7 31 1 8 25 8 26 23 27 22 18 MIN. QFE PRESSURE IN HPA ****** 855.2 853.4 859.8 861.6 857.9 856.2 855.2 860.4 862.9 864.7 860.4 ****** DAY ** 22 10 23 30 10 31 1 12 30 15 4 MEAN QNH PRESSURE IN HPA ****** 1013.5 1011.1 1014.9 1014.4 1011.1 1009.0 1010.2 1013.8 1018.2 1019.1 1017.1 ****** MAX. QNH PRESSURE IN HPA ****** 1017.7 1019.7 1020.1 1017.5 1015.0 1013.8 1013.5 1018.3 1022.1 1022.5 1022.2 ****** DAY ** 7 31 1 8 25 8 26 23 27 22 18 MIN. QNH PRESSURE IN HPA ****** 1004.5 1002.5 1009.8 1011.8 1007.6 1005.7 1004.5 1010.5 1013.3 1015.4 1010.5 ****** DAY ** 22 10 23 30 10 31 1 12 30 15 4 MEAN QFF PRESSURE IN HPA ****** 1015.6 1009.5 1008.9 1005.7 999.9 995.5 997.6 1003.9 1010.6 1016.4 1017.4 ****** MAX. QFF PRESSURE IN HPA ****** 1021.7 1020.9 1019.2 1012.7 1004.5 1001.3 1000.8 1010.0 1015.5 1022.2 1023.4 ****** DAY ** 3 31 1 8 1 8 26 29 22 21 18 MIN. QFF PRESSURE IN HPA ****** 1004.6 1001.0 1004.1 1000.7 995.1 992.8 992.5 999.0 1005.5 1012.8 1009.8 ****** DAY ** 22 10 23 30 30 31 1 8 11 10 4 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** 863.0 860.8 864.2 863.6 860.9 858.9 860.0 863.1 866.9 868.0 866.1 ****** MAX. QFE PRESSURE IN HPA ****** 867.3 868.9 869.0 866.4 863.9 864.0 862.7 867.2 870.7 871.3 870.7 ****** DAY ** 7 31 8 8 12 8 26 23 27 22 18 MIN. QFE PRESSURE IN HPA ****** 856.2 854.8 859.5 860.6 857.9 855.8 854.8 860.1 863.2 863.2 861.8 ****** DAY ** 22 28 23 6 10 31 1 5 11 14 12 MEAN QNH PRESSURE IN HPA ****** 1013.4 1010.9 1014.8 1014.1 1011.0 1008.7 1010.0 1013.5 1017.9 1019.1 1017.0 ****** MAX. QNH PRESSURE IN HPA ****** 1018.3 1020.1 1020.3 1017.3 1014.4 1014.6 1013.1 1018.2 1022.2 1022.9 1022.2 ****** DAY ** 7 31 8 8 12 8 26 23 27 22 18 MIN. QNH PRESSURE IN HPA ****** 1005.7 1004.1 1009.4 1010.7 1007.6 1005.2 1004.1 1010.1 1013.6 1013.6 1012.0 ****** DAY ** 22 28 23 6 10 31 1 5 11 14 12 MEAN QFF PRESSURE IN HPA ****** 1015.0 1008.7 1008.4 1005.3 999.6 995.3 997.1 1003.3 1009.8 1015.7 1016.5 ****** MAX. QFF PRESSURE IN HPA ****** 1021.5 1020.4 1019.2 1012.2 1005.1 1002.6 999.9 1009.1 1015.3 1021.4 1022.0 ****** DAY ** 3 31 1 8 12 8 26 29 31 21 17 MIN. QFF PRESSURE IN HPA ****** 1006.3 1001.9 1002.5 1001.2 994.6 992.1 992.7 998.7 1004.8 1010.2 1010.7 ****** DAY ** 22 9 23 30 30 25 1 1 11 14 12 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 1.9 3.8 9.6 13.7 22.1 26.8 30.1 28.3 25.5 18.7 13.6 8.2 16.8 MINIMUN AIR TEMPERATURE (C) -1.3 -0.0 4.5 8.0 15.4 19.4 24.7 21.9 19.1 13.7 9.2 4.4 11.6 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 7 27 23 1 0 0 0 60 DAYS WITH MINIMUM TEMP. <=-4 7 0 0 0 0 0 0 0 0 0 0 0 7 DAYS WITH FREEZING MIN.<= 0 21 16 0 0 0 0 0 0 0 0 0 5 42 TEMPERATURE RECORDS LOWEST(C) -10.6 -2.6 0.8 2.4 9.0 14.8 18.8 18.6 17.0 7.8 2.2 -3.0 -10.6 DAY 25 24 19 5 7 20 3 10 7 29 13 27 MAXIMUM AIR TEMPERATURE (C) 5.6 8.3 14.8 19.0 28.1 33.6 36.1 34.8 32.3 24.2 19.2 13.1 22.4 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 13 28 31 31 29 0 0 0 132 DAYS WITH MAXIMUM TEMP. <= 0 1 0 0 0 0 0 0 0 0 0 0 0 1 TEMPERATURE RECORDS HIGHEST(C) 11.6 12.6 19.4 26.8 34.2 37.4 39.0 39.8 34.4 29.0 23.6 20.4 39.8 DAY 13 27 10 27 21 24 17 14 9 7 5 2 DIF. BETWEEN (MAX.-MIN.) (C) 6.9 8.3 10.3 11.0 12.7 14.2 11.4 12.9 13.2 10.5 10.0 8.7 10.8 MEAN DAILY TEMP. (MDT) (C) 2.2 4.1 9.6 13.5 21.7 26.5 30.4 28.4 25.7 19.0 14.2 8.7 17.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 69.2 165.4 290.3 228.5 140.7 6.4 0.0 0.0 900.5 HEATING DEG. DAYS(BASE 18 0C) 490.1 388.1 258.9 142.3 10.6 0.0 0.0 0.0 0.0 25.2 113.8 287.7 1716.7 DEWPOINT (MEAN C) -3.4 -3.0 -3.6 -0.3 -2.0 3.1 4.2 1.2 -2.5 -1.7 -0.6 -3.5 -1.0 MIXING RATIO (G/KG) 3.62 3.67 3.74 4.56 3.97 5.73 6.17 4.92 3.84 4.26 4.41 3.65 4.38 VAPOUR PRESSURE (HPA) 5.00 5.05 5.16 6.28 5.47 7.84 8.42 6.74 5.29 5.89 6.11 5.06 6.02 SATURATION DEF. (HPA) 2.16 3.11 7.14 10.27 22.44 28.71 35.43 32.80 28.21 16.37 9.99 6.40 16.92 RELATIVE HUMIDITY (MEAN %) 71 65 45 43 22 23 20 18 17 30 40 47 37 RELATIVE HUMIDITY (MAX. %) 87 82 66 63 35 34 29 26 25 40 55 62 50 RELATIVE HUMIDITY (MIN. %) 53 45 27 27 13 16 14 11 10 19 26 32 24 RELATIVE HUMIDITY (MEAN% 03UTC) 72 70 50 51 28 27 25 24 20 36 46 52 42 RELATIVE HUMIDITY (MEAN% 09UTC) 61 52 33 31 15 19 15 13 11 23 29 37 28 RELATIVE HUMIDITY (MEAN% 15UTC) 74 65 44 35 18 19 17 14 15 28 43 49 35 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 132.6 129.3 54.7 59.0 0.2 0.0 0.0 0.0 0.0 44.8 25.0 53.0 498.6 DAYS WITH PRECIPITATION >=10 5 5 1 2 0 0 0 0 0 2 1 3 19 DAYS WITH PRECIPITATION >= 5 11 6 2 2 0 0 0 0 0 2 1 3 27 DAYS WITH PRECIPITATION >= 1 16 10 3 4 0 0 0 0 0 2 2 3 40 DAYS WITH PRECIPITATION 18 10 8 5 2 0 0 0 0 5 4 4 56 GREATEST DAILY PRECIPITATION 24.0 39.7 45.0 38.0 0.2 0.0 0.0 0.0 0.0 32.0 20.0 24.0 45.0 DAY 24 2 11 2 11 ** ** ** ** 28 11 24 DAY WITH THUNDER STORM 3 4 2 3 2 0 0 0 0 2 3 0 19 DAYS WITH SNOW OR SLEET 14 6 0 0 0 0 0 0 0 0 0 4 24 DAYS WITH DUST 0 0 2 0 2 2 6 0 2 0 0 0 14 WIND DIRECTION (PREVAILING) 180 90 180 270 90 270 270 270 270 270 270 180 270 PREVAILING WIND SPEED(KNOTS) 5.7 4.7 8.4 5.5 4.8 8.1 8.1 7.2 6.7 5.9 4.3 10.4 6.5 PREVAILING WIND PERCENT 14.1 19.2 17.7 18.3 12.5 20.8 16.5 17.3 16.7 8.5 8.8 7.3 12.0 CALMS PERCENT OF WIND 56.9 46.9 28.6 45.4 39.9 43.3 42.7 44.8 47.1 58.5 66.3 68.5 49.1 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 142 131 138 207 164 275 285 292 300 247 188 159 230 VECTOR WIND MAGNITUDE(KNOTS) 0.8 1.5 2.0 1.1 0.5 2.0 1.7 2.1 1.6 0.5 0.3 0.9 0.5 WIND STEADINESES (MEAN %) 36.4 55.6 37.0 34.4 14.3 47.6 41.5 58.3 59.3 25.0 20.0 40.9 16.1 WIND SPEED (MEAN KNOTS) 2.2 2.7 5.4 3.2 3.5 4.2 4.1 3.6 2.7 2.0 1.5 2.2 3.1 FASTEST WIND DIRECTION 30 120 90 90 150 360 300 260 340 330 150 160 160 FASTEST WIND SPEED (KNOTS) 19 19 39 19 23 19 29 19 23 17 16 43 43 DAY 30 1 21 1 11 6 23 14 8 8 9 24 DAYS WITH SKY CLEAR (0-2)/8 9 11 17 12 21 30 24 31 30 21 20 14 240 DAYS WITH P.CLOUDY (3-6)/8 6 11 8 12 8 0 7 0 0 7 5 11 75 DAYS WITH CLOUDY (7-8)/8 16 6 6 6 2 0 0 0 0 3 5 6 50 DAYS WITH VISIBILITY =< 2 KM 5 2 0 1 0 0 0 0 0 0 0 0 8 DURATION OF SUNSHINE HOURS 149.2 198.9 245.7 247.8 323.3 374.1 334.7 367.3 326.6 244.0 218.9 164.8 3195.3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 865.3 862.3 865.1 863.2 862.4 860.2 857.6 859.5 862.4 866.9 868.3 866.8 863.3 MAX. QFE PRESSURE IN HPA 872.3 869.0 872.6 867.6 866.6 866.3 862.8 863.0 867.3 871.2 873.5 871.8 873.5 DAY-HOUR 26- 6 8- 6 9- 9 24- 9 18- 9 4-18 15- 6 4-18 27-18 30- 6 14- 6 13- 6 MIN. QFE PRESSURE IN HPA 858.3 851.0 860.7 852.2 856.2 854.3 852.7 856.4 858.7 860.5 862.4 859.4 851.0 DAY-HOUR 4-12 10- 3 18-12 2- 0 12-12 25-15 5-15 1- 0 4- 0 14- 0 1-12 25- 0 MEAN QNH PRESSURE IN HPA 1016.1 1012.6 1015.8 1013.7 1012.8 1010.2 1007.3 1009.4 1012.8 1017.8 1019.4 1017.7 1013.8 MAX. QNH PRESSURE IN HPA 1024.0 1020.3 1024.3 1018.7 1017.5 1017.2 1013.2 1013.4 1018.3 1022.8 1025.4 1023.4 1025.4 DAY-HOUR 26- 6 8- 6 9- 9 24- 9 18- 9 4-18 15- 6 4-18 27-18 30- 6 14- 6 13- 6 MIN. QNH PRESSURE IN HPA 1008.1 999.7 1010.8 1001.1 1005.7 1003.5 1001.7 1005.9 1008.5 1010.6 1012.7 1009.3 999.7 DAY-HOUR 4-12 10- 3 18-12 2- 0 12-12 25-15 5-15 1- 0 4- 0 14- 0 1-12 25- 0 MEAN QFF PRESSURE IN HPA 1018.5 1013.8 1013.7 1009.2 1004.0 998.8 994.2 997.4 1002.2 1010.8 1015.1 1016.6 1007.9 MAX. QFF PRESSURE IN HPA 1029.5 1021.4 1022.7 1017.0 1010.1 1006.2 1000.4 1001.6 1007.8 1019.0 1024.4 1024.5 1029.5 DAY-HOUR 26- 6 13- 6 9- 6 4- 9 7- 9 4-15 15- 3 28-18 27- 6 30- 6 14- 6 28- 6 MIN. QFF PRESSURE IN HPA 1007.4 1000.1 1005.7 996.9 997.9 991.5 989.3 991.8 998.4 1002.5 1006.4 1010.2 989.3 DAY-HOUR 4-12 10- 3 24- 0 2- 0 11-21 25-15 13- 0 14- 0 4- 0 14- 0 1-12 24-18 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 865.1 861.9 864.7 862.6 861.9 859.8 857.2 859.0 861.9 866.4 867.9 866.7 862.9 MAX. QFE PRESSURE IN HPA 871.2 868.1 871.1 866.6 865.0 864.9 861.4 862.6 865.6 870.0 872.6 870.8 872.6 DAY 20 8 10 25 19 5 15 4 27 16 14 13 MIN. QFE PRESSURE IN HPA 859.8 852.0 860.7 852.2 857.0 854.8 853.2 856.4 858.7 860.5 863.0 859.4 852.0 DAY 4 10 24 2 12 26 5 1 4 14 2 25 MEAN QNH PRESSURE IN HPA 1015.8 1012.2 1015.4 1013.0 1012.2 1009.7 1006.8 1008.8 1012.1 1017.3 1019.0 1017.7 1013.3 MAX. QNH PRESSURE IN HPA 1022.8 1019.2 1022.6 1017.5 1015.7 1015.6 1011.6 1013.0 1016.4 1021.4 1024.3 1022.3 1024.3 DAY 20 8 10 25 19 5 15 4 27 16 14 13 MIN. QNH PRESSURE IN HPA 1009.8 1000.9 1010.8 1001.1 1006.6 1004.1 1002.2 1005.9 1008.5 1010.6 1013.4 1009.3 1000.9 DAY 4 10 24 2 12 26 5 1 4 14 2 25 MEAN QFF PRESSURE IN HPA 1017.9 1013.1 1013.2 1008.5 1003.4 998.5 993.6 996.6 1001.4 1009.9 1014.3 1016.1 1007.2 MAX. QFF PRESSURE IN HPA 1027.4 1020.3 1020.6 1014.5 1008.3 1004.8 999.0 999.9 1005.5 1016.6 1022.6 1024.2 1027.4 DAY 26 12 10 5 15 5 15 29 28 30 14 28 MIN. QFF PRESSURE IN HPA 1010.7 1000.6 1005.7 996.9 998.3 992.2 989.3 991.8 998.4 1002.5 1007.8 1010.3 989.3 DAY 5 10 24 2 30 26 13 14 4 14 2 25 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 864.9 861.9 864.8 862.8 862.2 860.0 857.5 859.2 862.2 866.6 868.1 866.7 863.1 MAX. QFE PRESSURE IN HPA 871.2 867.9 871.0 866.7 865.5 865.2 862.3 862.3 866.2 870.4 872.3 870.8 872.3 DAY 20 8 10 25 19 5 15 4 28 30 14 13 MIN. QFE PRESSURE IN HPA 860.1 851.0 860.7 854.3 856.8 855.0 853.4 856.4 858.7 860.5 863.3 859.4 851.0 DAY 4 10 24 2 13 26 5 1 4 14 2 25 MEAN QNH PRESSURE IN HPA 1015.6 1012.1 1015.4 1013.2 1012.5 1010.0 1007.2 1009.1 1012.5 1017.5 1019.2 1017.7 1013.5 MAX. QNH PRESSURE IN HPA 1022.8 1019.0 1022.5 1017.6 1016.3 1015.9 1012.6 1012.6 1017.1 1021.8 1024.0 1022.3 1024.0 DAY 20 8 10 25 19 5 15 4 28 30 14 13 MIN. QNH PRESSURE IN HPA 1010.1 999.7 1010.8 1003.5 1006.4 1004.3 1002.5 1005.9 1008.5 1010.6 1013.8 1009.3 999.7 DAY 4 10 24 2 13 26 5 1 4 14 2 25 MEAN QFF PRESSURE IN HPA 1018.4 1013.7 1013.9 1009.1 1004.1 998.9 994.4 997.5 1002.6 1011.1 1015.6 1017.1 1008.0 MAX. QFF PRESSURE IN HPA 1027.8 1020.9 1021.7 1015.3 1009.8 1005.1 1000.4 1000.6 1007.3 1018.5 1023.7 1023.8 1027.8 DAY 26 12 10 8 8 5 15 16 28 30 14 28 MIN. QFF PRESSURE IN HPA 1011.1 1000.1 1007.4 999.7 999.7 992.3 990.2 992.7 998.6 1003.4 1009.1 1010.7 990.2 DAY 4 10 24 2 22 25 5 14 4 14 2 25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 866.0 862.9 865.6 863.6 863.0 860.6 857.9 859.8 863.0 867.5 869.0 867.5 863.9 MAX. QFE PRESSURE IN HPA 872.3 869.0 872.1 867.2 866.5 866.0 862.8 863.0 867.2 871.2 873.5 871.8 873.5 DAY 26 8 9 19 18 5 15 16 27 30 14 13 MIN. QFE PRESSURE IN HPA 860.5 853.5 861.7 855.2 857.3 855.5 853.9 856.5 859.9 862.2 864.6 860.4 853.5 DAY 4 10 24 2 12 26 5 1 4 14 2 25 MEAN QNH PRESSURE IN HPA 1016.8 1013.3 1016.4 1014.1 1013.5 1010.6 1007.6 1009.7 1013.4 1018.6 1020.3 1018.6 1014.4 MAX. QNH PRESSURE IN HPA 1024.0 1020.3 1023.8 1018.2 1017.4 1016.8 1013.2 1013.4 1018.2 1022.8 1025.4 1023.4 1025.4 DAY 26 8 9 19 18 5 15 16 27 30 14 13 MIN. QNH PRESSURE IN HPA 1010.6 1002.6 1011.9 1004.5 1006.9 1004.9 1003.0 1006.0 1009.9 1012.5 1015.2 1010.5 1002.6 DAY 4 10 24 2 12 26 5 1 4 14 2 25 MEAN QFF PRESSURE IN HPA 1019.6 1014.8 1014.5 1009.6 1004.7 999.1 994.5 997.6 1002.8 1011.6 1016.3 1017.7 1008.6 MAX. QFF PRESSURE IN HPA 1029.5 1021.4 1022.7 1016.8 1009.6 1005.7 1000.3 1001.4 1007.8 1019.0 1024.4 1024.5 1029.5 DAY 26 13 9 4 8 5 15 16 27 30 14 28 MIN. QFF PRESSURE IN HPA 1011.4 1004.1 1008.1 1001.2 1000.0 992.4 990.9 993.0 999.1 1005.9 1009.9 1011.7 990.9 DAY 4 15 24 2 12 25 5 14 5 14 1 25 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.8 862.8 865.6 863.8 863.1 860.6 857.9 859.7 862.8 867.3 868.5 867.0 863.7 MAX. QFE PRESSURE IN HPA 871.7 868.7 872.6 867.6 866.6 865.8 862.8 862.9 866.6 870.8 873.2 871.3 873.2 DAY 26 8 9 24 18 4 15 16 27 30 14 13 MIN. QFE PRESSURE IN HPA 859.6 854.6 862.0 857.8 856.9 855.9 853.8 856.6 859.9 862.5 864.1 860.4 853.8 DAY 4 15 2 2 12 26 5 1 4 14 1 25 MEAN QNH PRESSURE IN HPA 1016.6 1013.1 1016.3 1014.3 1013.5 1010.7 1007.6 1009.7 1013.1 1018.3 1019.6 1018.0 1014.2 MAX. QNH PRESSURE IN HPA 1023.3 1019.9 1024.3 1018.7 1017.5 1016.6 1013.2 1013.3 1017.5 1022.3 1025.0 1022.9 1025.0 DAY 26 8 9 24 18 4 15 16 27 30 14 13 MIN. QNH PRESSURE IN HPA 1009.5 1003.8 1012.3 1007.5 1006.5 1005.3 1002.9 1006.1 1009.9 1012.8 1014.7 1010.5 1002.9 DAY 4 15 2 2 12 26 5 1 4 14 1 25 MEAN QFF PRESSURE IN HPA 1018.7 1014.0 1014.0 1009.7 1004.6 999.1 994.2 997.4 1002.3 1010.9 1014.8 1016.3 1008.0 MAX. QFF PRESSURE IN HPA 1026.8 1020.7 1022.3 1017.0 1010.1 1005.5 1000.4 1001.3 1007.3 1017.4 1022.6 1023.5 1026.8 DAY 26 12 9 4 7 4 15 16 27 30 14 28 MIN. QFF PRESSURE IN HPA 1009.4 1004.8 1008.1 1003.7 999.3 993.1 990.4 992.4 998.7 1006.2 1008.7 1012.3 990.4 DAY 4 15 24 15 12 25 13 14 9 14 1 25 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 864.7 861.7 864.5 863.0 862.2 860.1 857.3 859.2 862.0 866.5 867.5 866.1 862.9 MAX. QFE PRESSURE IN HPA 870.5 867.6 871.7 866.7 865.9 866.0 861.8 862.2 866.2 870.3 872.2 870.0 872.2 DAY 26 8 9 24 18 4 15 16 27 30 14 13 MIN. QFE PRESSURE IN HPA 858.3 853.8 860.7 856.3 856.2 855.5 853.1 856.6 859.4 862.7 862.4 859.9 853.1 DAY 4 15 18 1 12 25 5 1 4 14 1 25 MEAN QNH PRESSURE IN HPA 1015.3 1012.0 1015.2 1013.4 1012.5 1010.1 1006.9 1009.1 1012.3 1017.4 1018.6 1016.9 1013.3 MAX. QNH PRESSURE IN HPA 1022.0 1018.7 1023.3 1017.6 1016.7 1016.8 1012.0 1012.5 1017.1 1021.7 1023.9 1021.4 1023.9 DAY 26 8 9 24 18 4 15 16 27 30 14 13 MIN. QNH PRESSURE IN HPA 1008.1 1002.9 1010.8 1005.8 1005.7 1004.9 1002.1 1006.1 1009.3 1013.1 1012.7 1009.9 1002.1 DAY 4 15 18 1 12 25 5 1 4 14 1 25 MEAN QFF PRESSURE IN HPA 1017.3 1012.9 1013.0 1008.9 1003.7 998.7 993.7 997.0 1001.6 1010.0 1013.9 1015.3 1007.2 MAX. QFF PRESSURE IN HPA 1026.9 1019.6 1021.5 1016.3 1008.5 1005.8 999.4 1001.0 1006.4 1017.0 1021.5 1022.0 1026.9 DAY 25 8 9 4 8 4 15 16 27 30 14 28 MIN. QFF PRESSURE IN HPA 1007.4 1003.3 1007.9 1002.3 998.3 993.1 989.9 992.5 998.7 1005.0 1006.4 1011.0 989.9 DAY 4 15 31 1 11 25 13 14 4 13 1 9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 865.2 862.1 864.6 862.8 862.0 859.7 857.1 859.3 862.2 866.7 868.1 866.4 863.0 MAX. QFE PRESSURE IN HPA 870.6 867.3 871.9 866.3 865.3 866.0 861.7 862.4 866.3 870.8 872.9 870.1 872.9 DAY 26 7 9 24 18 4 15 4 27 30 14 28 MIN. QFE PRESSURE IN HPA 858.6 855.3 861.0 855.4 856.2 854.3 852.7 856.7 859.3 862.3 862.8 859.6 852.7 DAY 1 15 31 1 12 25 5 1 4 13 1 24 MEAN QNH PRESSURE IN HPA 1015.9 1012.4 1015.3 1013.2 1012.2 1009.6 1006.7 1009.2 1012.5 1017.6 1019.2 1017.3 1013.4 MAX. QNH PRESSURE IN HPA 1022.1 1018.3 1023.6 1017.2 1016.0 1016.8 1011.9 1012.7 1017.2 1022.3 1024.7 1021.5 1024.7 DAY 26 7 9 24 18 4 15 4 27 30 14 28 MIN. QNH PRESSURE IN HPA 1008.4 1004.6 1011.1 1004.8 1005.7 1003.5 1001.7 1006.2 1009.2 1012.6 1013.2 1009.5 1001.7 DAY 1 15 31 1 12 25 5 1 4 13 1 24 MEAN QFF PRESSURE IN HPA 1018.7 1013.9 1013.6 1009.1 1003.8 998.4 994.0 997.6 1002.6 1011.2 1015.7 1016.7 1007.9 MAX. QFF PRESSURE IN HPA 1029.1 1020.6 1022.0 1015.8 1009.3 1006.2 999.4 1001.5 1007.7 1018.6 1023.8 1023.0 1029.1 DAY 25 12 9 4 7 4 15 16 27 30 14 28 MIN. QFF PRESSURE IN HPA 1008.9 1005.3 1007.1 1000.5 999.7 991.5 989.7 993.3 998.4 1005.1 1008.0 1011.3 989.7 DAY 1 15 31 1 29 25 5 14 5 13 1 24 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 865.7 862.6 865.5 863.6 862.7 860.6 858.2 860.2 863.0 867.2 868.6 867.0 863.8 MAX. QFE PRESSURE IN HPA 870.9 868.5 872.4 867.3 866.3 866.3 862.6 863.0 867.3 871.0 873.4 871.0 873.4 DAY 19 7 9 24 18 4 15 4 27 30 14 12 MIN. QFE PRESSURE IN HPA 859.9 855.8 862.4 854.7 857.7 856.0 854.3 857.8 860.1 862.3 863.4 859.6 854.3 DAY 4 9 18 1 12 25 5 1 4 13 1 24 MEAN QNH PRESSURE IN HPA 1016.5 1013.0 1016.3 1014.1 1013.1 1010.7 1008.0 1010.2 1013.4 1018.2 1019.8 1018.0 1014.3 MAX. QNH PRESSURE IN HPA 1022.4 1019.7 1024.1 1018.3 1017.2 1017.2 1013.0 1013.4 1018.3 1022.5 1025.3 1022.5 1025.3 DAY 19 7 9 24 18 4 15 4 27 30 14 12 MIN. QNH PRESSURE IN HPA 1009.9 1005.2 1012.7 1004.0 1007.4 1005.4 1003.5 1007.5 1010.1 1012.6 1013.9 1009.5 1003.5 DAY 4 9 18 1 12 25 5 1 4 13 1 24 MEAN QFF PRESSURE IN HPA 1019.2 1014.4 1014.3 1009.6 1004.3 999.2 994.9 998.1 1002.8 1011.4 1015.9 1017.1 1008.4 MAX. QFF PRESSURE IN HPA 1027.8 1021.2 1022.4 1016.8 1008.6 1006.0 999.9 1001.6 1007.7 1018.7 1023.9 1023.9 1027.8 DAY 25 7 9 4 14 4 15 28 27 30 14 28 MIN. QFF PRESSURE IN HPA 1009.7 1004.9 1008.0 999.5 998.5 992.9 991.7 993.6 999.5 1004.4 1008.6 1010.2 991.7 DAY 4 9 31 1 11 25 12 14 5 13 1 24 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 865.5 862.5 865.3 863.6 862.5 860.4 858.0 859.7 862.6 867.0 868.4 866.9 863.5 MAX. QFE PRESSURE IN HPA 871.3 868.4 872.2 867.5 866.1 866.0 862.1 862.7 866.6 870.5 872.8 871.0 872.8 DAY 19 7 9 24 18 4 15 4 27 15 14 12 MIN. QFE PRESSURE IN HPA 860.5 853.6 861.7 854.4 857.7 856.0 854.5 857.3 859.7 861.4 863.4 859.6 853.6 DAY 1 9 18 1 11 25 5 13 3 13 1 24 MEAN QNH PRESSURE IN HPA 1016.3 1012.8 1016.0 1014.1 1012.9 1010.4 1007.7 1009.7 1012.9 1017.9 1019.6 1017.9 1014.0 MAX. QNH PRESSURE IN HPA 1022.9 1019.6 1023.9 1018.5 1016.9 1016.8 1012.4 1013.1 1017.5 1022.0 1024.6 1022.5 1024.6 DAY 19 7 9 24 18 4 15 4 27 15 14 12 MIN. QNH PRESSURE IN HPA 1010.6 1002.7 1011.9 1003.6 1007.4 1005.4 1003.7 1006.9 1009.7 1011.6 1013.9 1009.5 1002.7 DAY 1 9 18 1 11 25 5 13 3 13 1 24 MEAN QFF PRESSURE IN HPA 1018.4 1013.7 1013.6 1009.4 1003.8 998.9 994.4 997.3 1002.1 1010.6 1014.8 1016.2 1007.8 MAX. QFF PRESSURE IN HPA 1027.5 1020.6 1021.5 1015.8 1009.1 1005.7 999.2 1000.9 1006.6 1017.2 1022.7 1023.5 1027.5 DAY 25 11 9 3 14 4 15 28 27 29 13 28 MIN. QFF PRESSURE IN HPA 1010.1 1001.6 1007.6 999.3 997.9 993.1 989.9 992.8 998.7 1003.2 1008.1 1010.6 989.9 DAY 4 9 31 1 11 25 12 13 9 13 1 24 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.6 4.5 9.1 16.5 19.5 27.1 29.1 28.6 25.2 17.6 12.5 5.2 16.6 MINIMUN AIR TEMPERATURE (C) 1.4 0.7 5.1 11.1 13.7 21.0 22.3 22.4 19.5 13.2 8.3 1.8 11.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 14 27 21 7 0 0 0 69 DAYS WITH MINIMUM TEMP. <=-4 1 3 0 0 0 0 0 0 0 0 0 0 4 DAYS WITH FREEZING MIN.<= 0 6 13 3 0 0 0 0 0 0 0 0 10 32 TEMPERATURE RECORDS LOWEST(C) -4.2 -5.4 -2.0 4.4 8.6 15.0 18.2 19.2 15.4 10.0 5.0 -1.2 -5.4 DAY 28 10 8 13 24 4 8 31 21 23 26 16 MAXIMUM AIR TEMPERATURE (C) 8.7 9.0 13.3 21.7 25.2 32.8 35.6 35.1 31.5 22.9 17.7 9.2 21.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 1 23 31 31 21 0 0 0 107 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 13.6 15.6 20.6 28.8 30.4 37.6 39.6 39.6 36.4 28.6 23.8 13.8 39.6 DAY 6 24 29 25 9 25 31 1 1 13 2 8 DIF. BETWEEN (MAX.-MIN.) (C) 7.3 8.3 8.2 10.6 11.5 11.8 13.3 12.7 12.0 9.7 9.4 7.4 10.2 MEAN DAILY TEMP. (MDT) (C) 5.0 4.8 9.2 16.4 19.5 26.9 29.0 28.8 25.5 18.1 13.0 5.5 16.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 9.2 7.2 176.7 246.5 240.9 134.6 5.2 0.0 0.0 820.3 HEATING DEG. DAYS(BASE 18 0C) 401.7 368.3 273.2 81.4 12.0 0.0 0.0 0.0 0.0 31.0 151.9 387.3 1706.8 DEWPOINT (MEAN C) -1.2 -4.0 1.7 0.5 -2.4 -0.4 3.2 1.7 -3.0 4.2 -0.1 -1.1 -0.1 MIXING RATIO (G/KG) 4.22 3.69 5.24 4.79 3.98 4.52 5.92 5.27 3.77 6.23 4.57 4.35 4.71 VAPOUR PRESSURE (HPA) 5.82 5.10 7.20 6.60 5.47 6.19 8.08 7.21 5.20 8.60 6.32 6.00 6.48 SATURATION DEF. (HPA) 2.84 3.59 4.80 13.07 17.87 30.79 33.36 33.07 27.92 12.09 8.57 3.04 15.92 RELATIVE HUMIDITY (MEAN %) 69 59 63 38 25 18 21 19 17 45 46 67 41 RELATIVE HUMIDITY (MAX. %) 84 75 80 54 39 27 30 29 27 61 62 85 54 RELATIVE HUMIDITY (MIN. %) 51 39 43 23 15 11 13 11 9 29 26 48 27 RELATIVE HUMIDITY (MEAN% 03UTC) 70 67 66 45 32 24 27 25 22 52 51 70 46 RELATIVE HUMIDITY (MEAN% 09UTC) 56 47 49 27 17 12 14 12 11 32 31 55 30 RELATIVE HUMIDITY (MEAN% 15UTC) 78 59 63 33 20 13 17 16 15 43 47 74 40 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 94.8 148.5 128.2 33.9 0.2 0.0 0.0 0.0 0.0 26.1 47.2 186.7 665.6 DAYS WITH PRECIPITATION >=10 3 3 5 2 0 0 0 0 0 1 1 7 22 DAYS WITH PRECIPITATION >= 5 6 5 9 3 0 0 0 0 0 3 4 9 39 DAYS WITH PRECIPITATION >= 1 10 7 13 4 0 0 0 0 0 6 4 14 58 DAYS WITH PRECIPITATION 11 8 15 6 1 0 0 0 0 8 4 15 68 GREATEST DAILY PRECIPITATION 33.0 86.0 26.0 12.0 0.2 0.0 0.0 0.0 0.0 10.6 25.0 38.0 86.0 DAY 14 26 6 17 2 ** ** ** ** 21 14 12 DAY WITH THUNDER STORM 0 1 7 2 0 0 0 0 1 3 2 9 25 DAYS WITH SNOW OR SLEET 5 1 4 0 0 0 0 0 0 0 0 5 15 DAYS WITH DUST 0 0 1 4 10 11 9 9 0 1 1 0 46 WIND DIRECTION (PREVAILING) 180 135 180 270 270 270 270 270 270 90 135 135 270 PREVAILING WIND SPEED(KNOTS) 3.5 4.8 5.9 6.8 6.2 7.0 6.3 6.3 4.8 4.0 5.2 5.3 5.8 PREVAILING WIND PERCENT 11.7 9.8 13.7 11.7 19.8 15.8 19.4 18.5 14.2 9.7 9.2 11.7 11.5 CALMS PERCENT OF WIND 67.3 62.1 52.8 50.0 44.0 44.6 55.6 51.2 49.2 56.5 64.2 68.5 55.5 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 163 202 174 239 288 300 278 266 323 211 162 165 246 VECTOR WIND MAGNITUDE(KNOTS) 0.8 0.8 1.3 0.8 1.8 1.3 1.8 1.7 1.0 0.1 0.9 1.1 0.6 WIND STEADINESES (MEAN %) 61.5 38.1 44.8 24.2 54.5 37.1 72.0 60.7 37.0 5.9 56.3 68.7 25.0 WIND SPEED (MEAN KNOTS) 1.3 2.1 2.9 3.3 3.3 3.5 2.5 2.8 2.7 1.7 1.6 1.6 2.4 FASTEST WIND DIRECTION 130 260 150 260 70 230 240 290 70 60 160 150 150 FASTEST WIND SPEED (KNOTS) 17 23 33 29 19 19 17 23 17 16 19 23 33 DAY 13 4 5 17 5 26 24 26 26 1 30 31 DAYS WITH SKY CLEAR (0-2)/8 9 9 10 10 19 28 31 31 29 16 16 13 221 DAYS WITH P.CLOUDY (3-6)/8 12 12 11 13 6 2 0 0 1 9 10 8 84 DAYS WITH CLOUDY (7-8)/8 10 7 10 7 6 0 0 0 0 6 4 10 60 DAYS WITH VISIBILITY =< 2 KM 5 1 2 0 4 0 0 1 0 0 0 2 15 DURATION OF SUNSHINE HOURS 149.7 167.0 185.0 241.2 292.9 361.7 374.8 ****** 203.1 222.3 216.6 166.2 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 864.9 864.8 862.6 864.4 862.4 859.9 857.1 858.6 863.8 867.3 867.6 864.4 863.2 MAX. QFE PRESSURE IN HPA 870.8 872.9 868.4 870.3 866.6 865.7 861.0 862.4 867.6 872.0 872.3 869.7 872.9 DAY-HOUR 28- 6 15- 9 17-21 19- 6 8-18 1- 6 2- 6 31-18 29- 6 21- 6 14- 6 6-18 MIN. QFE PRESSURE IN HPA 856.9 858.0 851.2 858.4 858.4 854.8 853.2 855.6 859.2 863.5 861.3 854.0 851.2 DAY-HOUR 26- 3 7-12 6- 6 4-12 28- 0 19-15 14-12 11-15 3-12 15- 0 4-12 31-12 MEAN QNH PRESSURE IN HPA 1015.6 1015.5 1012.9 1015.0 1012.7 1009.9 1006.7 1008.4 1014.4 1018.3 1018.6 1015.0 1013.6 MAX. QNH PRESSURE IN HPA 1022.3 1024.7 1019.6 1021.7 1017.5 1016.5 1011.1 1012.7 1018.7 1023.7 1024.0 1021.0 1024.7 DAY-HOUR 28- 6 15- 9 17-21 19- 6 8-18 1- 6 2- 6 31-18 29- 6 21- 6 14- 6 6-18 MIN. QNH PRESSURE IN HPA 1006.5 1007.7 1000.0 1008.2 1008.2 1004.1 1002.2 1005.0 1009.1 1014.0 1011.5 1003.2 1000.0 DAY-HOUR 26- 3 7-12 6- 6 4-12 28- 0 19-15 14-12 11-15 3-12 15- 0 4-12 31-12 MEAN QFF PRESSURE IN HPA 1016.3 1016.4 1011.0 1009.1 1005.2 998.5 994.2 996.1 1004.0 1011.7 1015.0 1015.3 1007.7 MAX. QFF PRESSURE IN HPA 1026.7 1025.8 1020.3 1016.6 1010.0 1007.6 999.0 1001.6 1009.7 1018.4 1021.9 1023.1 1026.7 DAY-HOUR 28- 6 15- 6 8- 6 13-18 24-18 1- 6 2- 3 31- 6 29- 6 21- 6 14- 6 29-18 MIN. QFF PRESSURE IN HPA 1009.7 1008.4 998.5 1002.2 999.2 990.4 989.8 991.0 997.2 1005.9 1005.6 1003.1 989.8 DAY-HOUR 14- 9 20-12 6- 6 9- 0 16-12 20- 0 14-12 2- 0 3-12 15- 0 4-12 31-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 864.9 864.6 862.3 863.9 861.8 859.6 856.7 858.1 863.3 866.9 867.5 864.4 862.8 MAX. QFE PRESSURE IN HPA 870.0 872.5 867.4 868.6 865.2 864.3 860.4 860.6 866.2 870.8 870.4 869.0 872.5 DAY 28 16 18 19 9 1 2 31 29 21 14 30 MIN. QFE PRESSURE IN HPA 857.2 858.6 852.8 859.3 858.4 855.0 853.6 855.7 859.3 863.5 863.6 857.0 852.8 DAY 26 21 6 4 28 20 15 2 4 15 4 22 MEAN QNH PRESSURE IN HPA 1015.6 1015.3 1012.6 1014.4 1012.0 1009.5 1006.2 1007.8 1013.7 1017.8 1018.5 1015.0 1013.2 MAX. QNH PRESSURE IN HPA 1021.4 1024.2 1018.4 1019.8 1015.9 1014.9 1010.5 1010.7 1017.1 1022.3 1021.8 1020.3 1024.2 DAY 28 16 18 19 9 1 2 31 29 21 14 30 MIN. QNH PRESSURE IN HPA 1006.8 1008.4 1001.8 1009.2 1008.2 1004.3 1002.7 1005.1 1009.2 1014.0 1014.1 1006.6 1001.8 DAY 26 21 6 4 28 20 15 2 4 15 4 22 MEAN QFF PRESSURE IN HPA 1016.0 1015.8 1010.5 1008.4 1004.4 998.1 993.6 995.4 1003.0 1011.0 1014.4 1015.0 1007.1 MAX. QFF PRESSURE IN HPA 1025.5 1024.3 1018.4 1015.1 1008.2 1006.0 998.3 1000.1 1007.1 1015.5 1019.5 1021.1 1025.5 DAY 28 16 8 14 25 1 2 31 29 22 27 30 MIN. QFF PRESSURE IN HPA 1009.8 1009.2 1000.1 1002.2 999.6 990.4 990.2 991.0 997.9 1005.9 1006.2 1006.9 990.2 DAY 26 21 6 9 28 20 15 2 3 15 4 22 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 864.7 864.7 862.2 864.1 862.1 859.8 857.0 858.4 863.7 867.2 867.6 864.3 863.0 MAX. QFE PRESSURE IN HPA 869.9 871.5 867.4 869.1 865.2 864.8 860.8 861.0 866.7 871.4 871.6 868.6 871.6 DAY 28 16 18 19 9 1 2 31 29 20 14 30 MIN. QFE PRESSURE IN HPA 856.9 858.8 851.6 859.5 858.8 855.6 853.8 856.0 859.8 863.7 862.4 857.2 851.6 DAY 26 8 6 4 28 19 15 12 4 15 4 22 MEAN QNH PRESSURE IN HPA 1015.3 1015.3 1012.6 1014.7 1012.4 1009.8 1006.5 1008.1 1014.2 1018.2 1018.6 1014.9 1013.4 MAX. QNH PRESSURE IN HPA 1021.3 1023.1 1018.4 1020.4 1015.9 1015.5 1010.9 1011.1 1017.6 1023.0 1023.2 1019.8 1023.2 DAY 28 16 18 19 9 1 2 31 29 20 14 30 MIN. QNH PRESSURE IN HPA 1006.5 1008.6 1000.4 1009.4 1008.6 1005.0 1002.9 1005.4 1009.8 1014.2 1012.7 1006.8 1000.4 DAY 26 8 6 4 28 19 15 12 4 15 4 22 MEAN QFF PRESSURE IN HPA 1016.5 1016.7 1011.1 1009.3 1005.2 998.7 994.4 996.4 1004.3 1012.2 1015.6 1015.8 1008.0 MAX. QFF PRESSURE IN HPA 1026.1 1024.1 1018.9 1016.3 1008.7 1006.5 999.0 1001.3 1009.0 1017.1 1020.9 1022.2 1026.1 DAY 28 15 8 14 25 1 2 31 29 20 27 17 MIN. QFF PRESSURE IN HPA 1009.8 1010.2 998.7 1002.7 1000.7 991.4 990.9 991.8 999.5 1007.1 1006.1 1007.9 990.9 DAY 26 27 6 9 28 20 15 5 3 15 4 22 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 865.5 865.5 863.2 865.0 862.9 860.4 857.4 858.9 864.5 868.1 868.4 864.9 863.7 MAX. QFE PRESSURE IN HPA 870.8 872.6 868.3 870.3 866.1 865.7 861.0 862.0 867.6 872.0 872.3 869.6 872.6 DAY 28 15 18 19 9 1 2 31 29 21 14 6 MIN. QFE PRESSURE IN HPA 858.5 860.0 851.2 859.0 859.6 856.3 854.0 856.5 860.6 863.9 863.2 857.3 851.2 DAY 26 8 6 4 28 19 14 12 3 15 4 25 MEAN QNH PRESSURE IN HPA 1016.3 1016.3 1013.7 1015.7 1013.3 1010.4 1007.0 1008.8 1015.1 1019.2 1019.6 1015.6 1014.2 MAX. QNH PRESSURE IN HPA 1022.3 1024.3 1019.5 1021.7 1016.9 1016.5 1011.1 1012.3 1018.7 1023.7 1024.0 1020.9 1024.3 DAY 28 15 18 19 9 1 2 31 29 21 14 6 MIN. QNH PRESSURE IN HPA 1008.3 1010.0 1000.0 1008.9 1009.5 1005.8 1003.2 1006.0 1010.7 1014.4 1013.6 1006.9 1000.0 DAY 26 8 6 4 28 19 14 12 3 15 4 25 MEAN QFF PRESSURE IN HPA 1017.3 1017.5 1011.9 1009.8 1005.8 999.1 994.3 996.4 1004.8 1012.8 1016.1 1016.1 1008.5 MAX. QFF PRESSURE IN HPA 1026.7 1025.8 1020.3 1016.2 1009.1 1007.6 998.7 1001.6 1009.7 1018.4 1021.9 1022.7 1026.7 DAY 28 15 8 14 24 1 2 31 29 21 14 29 MIN. QFF PRESSURE IN HPA 1011.3 1009.9 998.5 1002.8 1001.6 992.6 990.8 992.5 998.5 1007.4 1007.1 1006.5 990.8 DAY 31 20 6 4 28 19 14 5 3 15 4 25 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.1 865.2 863.1 865.0 862.9 860.4 857.5 858.9 864.3 867.7 867.9 864.3 863.5 MAX. QFE PRESSURE IN HPA 870.8 872.9 867.5 869.9 866.3 865.7 861.0 861.9 866.9 870.9 871.8 869.2 872.9 DAY 28 15 18 19 8 1 2 31 22 21 14 29 MIN. QFE PRESSURE IN HPA 859.0 859.5 852.9 859.0 859.5 856.1 853.8 856.5 859.9 863.9 862.6 854.6 852.9 DAY 25 20 6 4 28 19 14 12 3 15 4 31 MEAN QNH PRESSURE IN HPA 1015.9 1015.9 1013.5 1015.7 1013.3 1010.4 1007.1 1008.7 1014.9 1018.7 1019.0 1014.9 1014.0 MAX. QNH PRESSURE IN HPA 1022.3 1024.7 1018.5 1021.3 1017.2 1016.5 1011.1 1012.2 1017.9 1022.4 1023.4 1020.5 1024.7 DAY 28 15 18 19 8 1 2 31 22 21 14 29 MIN. QNH PRESSURE IN HPA 1008.9 1009.4 1001.9 1008.9 1009.4 1005.6 1002.9 1006.0 1009.9 1014.4 1013.0 1003.8 1001.9 DAY 25 20 6 4 28 19 14 12 3 15 4 31 MEAN QFF PRESSURE IN HPA 1016.1 1016.4 1011.3 1009.6 1005.6 999.0 994.3 996.1 1004.2 1011.7 1014.9 1014.9 1007.8 MAX. QFF PRESSURE IN HPA 1025.5 1024.7 1019.2 1015.6 1009.5 1007.2 998.6 1000.7 1008.9 1015.8 1021.0 1021.7 1025.5 DAY 28 15 8 14 24 1 2 31 22 20 14 29 MIN. QFF PRESSURE IN HPA 1009.7 1009.1 1000.3 1003.7 1000.6 991.9 990.7 992.5 997.7 1007.3 1007.2 1004.0 990.7 DAY 14 20 6 9 16 19 14 5 3 14 4 31 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 864.2 864.2 862.2 864.2 862.3 859.7 856.9 858.3 863.4 866.8 866.9 863.6 862.7 MAX. QFE PRESSURE IN HPA 869.6 872.2 866.4 869.0 865.9 864.6 860.6 861.5 865.9 870.0 869.6 868.6 872.2 DAY 28 15 17 19 8 1 2 31 22 21 14 29 MIN. QFE PRESSURE IN HPA 858.0 858.0 852.5 858.4 858.8 855.1 853.2 856.1 859.2 864.2 861.3 854.0 852.5 DAY 25 7 6 4 16 19 14 1 3 1 4 31 MEAN QNH PRESSURE IN HPA 1014.8 1014.8 1012.5 1014.8 1012.6 1009.7 1006.5 1008.0 1013.9 1017.8 1017.8 1014.1 1013.1 MAX. QNH PRESSURE IN HPA 1020.9 1023.9 1017.3 1020.3 1016.7 1015.2 1010.7 1011.7 1016.7 1021.4 1020.9 1019.8 1023.9 DAY 28 15 17 19 8 1 2 31 22 21 14 29 MIN. QNH PRESSURE IN HPA 1007.7 1007.7 1001.5 1008.2 1008.6 1004.4 1002.2 1005.6 1009.1 1014.8 1011.5 1003.2 1001.5 DAY 25 7 6 4 16 19 14 1 3 1 4 31 MEAN QFF PRESSURE IN HPA 1015.2 1015.3 1010.4 1008.8 1005.0 998.2 993.9 995.7 1003.3 1011.0 1013.7 1014.0 1007.0 MAX. QFF PRESSURE IN HPA 1023.9 1024.4 1017.0 1015.5 1008.8 1005.8 998.2 1000.6 1007.9 1015.9 1019.6 1020.8 1024.4 DAY 28 15 8 13 24 1 2 31 22 21 14 29 MIN. QFF PRESSURE IN HPA 1010.1 1008.4 1000.1 1003.1 999.2 990.8 989.8 991.1 997.2 1006.8 1005.6 1003.1 989.8 DAY 2 20 6 4 16 19 14 1 3 14 4 31 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 864.8 864.7 862.3 864.0 862.0 859.4 856.8 858.2 863.4 866.9 867.3 864.1 862.8 MAX. QFE PRESSURE IN HPA 870.0 872.4 866.9 868.2 865.3 863.1 860.1 861.6 866.2 870.3 870.1 869.2 872.4 DAY 12 15 17 19 8 1 2 31 14 20 24 29 MIN. QFE PRESSURE IN HPA 858.0 858.0 853.0 859.3 858.8 854.8 853.3 855.6 859.3 863.5 861.6 855.1 853.0 DAY 25 20 6 4 16 19 14 11 3 15 30 31 MEAN QNH PRESSURE IN HPA 1015.5 1015.3 1012.6 1014.6 1012.3 1009.3 1006.3 1008.0 1013.9 1017.9 1018.3 1014.7 1013.2 MAX. QNH PRESSURE IN HPA 1021.4 1024.1 1017.9 1019.3 1016.0 1013.5 1010.1 1011.8 1017.1 1021.7 1021.5 1020.5 1024.1 DAY 12 15 17 19 8 1 2 31 14 20 24 29 MIN. QNH PRESSURE IN HPA 1007.7 1007.7 1002.0 1009.2 1008.6 1004.1 1002.4 1005.0 1009.2 1014.0 1011.8 1004.4 1002.0 DAY 25 20 6 4 16 19 14 11 3 15 30 31 MEAN QFF PRESSURE IN HPA 1016.6 1016.6 1010.9 1009.1 1005.2 998.2 994.2 996.2 1004.1 1011.8 1015.3 1015.6 1007.8 MAX. QFF PRESSURE IN HPA 1024.8 1025.4 1017.0 1016.0 1009.5 1003.7 998.0 1001.2 1008.4 1016.6 1020.1 1022.7 1025.4 DAY 28 15 8 13 24 1 1 31 30 21 26 29 MIN. QFF PRESSURE IN HPA 1010.7 1008.7 1001.7 1003.4 999.3 990.8 990.5 991.7 998.5 1007.5 1008.2 1005.3 990.5 DAY 2 20 6 9 16 19 14 5 3 14 30 31 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 865.2 865.0 862.9 864.6 862.8 860.1 857.7 859.2 864.2 867.5 867.7 864.7 863.5 MAX. QFE PRESSURE IN HPA 870.3 872.5 867.8 868.6 866.6 864.0 860.9 862.4 867.0 870.6 870.8 869.7 872.5 DAY 12 15 17 19 8 22 2 31 14 20 26 6 MIN. QFE PRESSURE IN HPA 858.3 858.5 853.3 859.5 859.7 855.4 854.0 856.7 859.9 864.5 862.1 856.4 853.3 DAY 25 20 6 9 22 19 14 11 3 14 30 31 MEAN QNH PRESSURE IN HPA 1015.9 1015.7 1013.3 1015.2 1013.2 1010.2 1007.3 1009.1 1014.8 1018.5 1018.8 1015.4 1013.9 MAX. QNH PRESSURE IN HPA 1021.7 1024.2 1018.9 1019.8 1017.5 1014.6 1011.0 1012.7 1018.0 1022.1 1022.3 1021.0 1024.2 DAY 12 15 17 19 8 22 2 31 14 20 26 6 MIN. QNH PRESSURE IN HPA 1008.1 1008.3 1002.4 1009.4 1009.7 1004.8 1003.2 1006.2 1009.9 1015.1 1012.4 1005.9 1002.4 DAY 25 20 6 9 22 19 14 11 3 14 30 31 MEAN QFF PRESSURE IN HPA 1016.9 1016.9 1011.4 1009.2 1005.6 998.7 994.7 996.7 1004.5 1012.1 1015.4 1016.0 1008.2 MAX. QFF PRESSURE IN HPA 1026.0 1025.2 1018.1 1016.6 1010.0 1003.9 998.6 1001.2 1008.0 1016.5 1020.9 1023.1 1026.0 DAY 27 15 7 13 24 1 1 31 30 20 26 29 MIN. QFF PRESSURE IN HPA 1010.4 1008.4 1002.9 1003.2 999.9 991.5 990.7 992.0 999.0 1006.9 1006.4 1006.3 990.7 DAY 2 20 6 3 16 19 14 1 3 14 3 31 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 865.0 864.9 862.7 864.7 862.6 860.0 857.4 858.9 863.9 867.3 867.7 864.8 863.3 MAX. QFE PRESSURE IN HPA 870.1 872.5 868.4 868.6 866.2 864.3 861.0 862.2 866.4 871.0 870.6 869.6 872.5 DAY 27 15 17 18 8 22 2 31 14 20 26 29 MIN. QFE PRESSURE IN HPA 858.0 858.7 855.0 860.3 859.5 855.4 854.2 856.4 859.8 864.0 861.5 857.9 854.2 DAY 25 20 5 9 22 19 14 11 3 14 30 31 MEAN QNH PRESSURE IN HPA 1015.7 1015.6 1013.1 1015.3 1012.9 1010.0 1007.1 1008.8 1014.5 1018.3 1018.7 1015.5 1013.8 MAX. QNH PRESSURE IN HPA 1021.5 1024.2 1019.6 1019.8 1017.1 1014.9 1011.1 1012.5 1017.3 1022.5 1022.1 1020.9 1024.2 DAY 27 15 17 18 8 22 2 31 14 20 26 29 MIN. QNH PRESSURE IN HPA 1007.7 1008.5 1004.3 1010.3 1009.4 1004.8 1003.4 1005.9 1009.8 1014.6 1011.7 1007.6 1003.4 DAY 25 20 5 9 22 19 14 11 3 14 30 31 MEAN QFF PRESSURE IN HPA 1016.0 1016.0 1010.8 1009.1 1005.2 998.4 994.2 996.1 1003.8 1011.3 1014.6 1015.5 1007.6 MAX. QFF PRESSURE IN HPA 1025.6 1024.1 1018.8 1016.4 1008.6 1003.8 998.5 1000.1 1007.4 1016.3 1019.8 1021.8 1025.6 DAY 27 15 7 13 8 1 1 31 22 20 26 29 MIN. QFF PRESSURE IN HPA 1010.0 1008.8 1002.3 1004.2 1000.6 991.0 990.8 992.1 998.2 1006.0 1006.1 1008.3 990.8 DAY 25 20 5 28 16 19 14 1 2 14 3 31 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 0.1 1.0 4.4 12.6 18.3 24.7 28.8 28.1 24.3 18.5 10.7 4.1 14.6 MINIMUN AIR TEMPERATURE (C) -2.7 -1.9 0.8 8.0 13.2 19.0 22.5 22.7 18.8 12.9 6.8 1.1 10.1 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 3 25 30 9 0 0 0 68 DAYS WITH MINIMUM TEMP. <=-4 10 9 4 0 0 0 0 0 0 0 1 3 27 DAYS WITH FREEZING MIN.<= 0 22 19 14 0 0 0 0 0 0 0 4 13 72 TEMPERATURE RECORDS LOWEST(C) -12.6 -10.0 -5.6 2.8 8.2 15.4 18.4 20.6 11.6 8.2 -4.0 -9.6 -12.6 DAY 4 29 1 1 6 18 13 11 26 28 26 28 MAXIMUM AIR TEMPERATURE (C) 3.9 4.6 8.6 17.3 23.1 30.0 34.9 33.6 30.3 24.7 15.4 7.9 19.5 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 4 16 30 31 18 0 0 0 99 DAYS WITH MAXIMUM TEMP. <= 0 6 2 0 0 0 0 0 0 0 0 0 0 8 TEMPERATURE RECORDS HIGHEST(C) 9.0 10.0 17.0 22.4 31.8 34.6 37.2 37.4 34.2 29.0 22.6 14.0 37.4 DAY 10 16 29 12 29 30 16 16 2 4 4 11 DIF. BETWEEN (MAX.-MIN.) (C) 6.6 6.5 7.8 9.3 9.9 11.0 12.4 10.9 11.5 11.8 8.6 6.8 9.4 MEAN DAILY TEMP. (MDT) (C) 0.6 1.3 4.7 12.7 18.1 24.5 28.7 28.2 24.5 18.8 11.1 4.5 14.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 21.3 105.1 238.6 222.2 113.3 2.3 0.0 0.0 702.8 HEATING DEG. DAYS(BASE 18 0C) 538.5 483.4 412.3 160.1 45.5 0.0 0.0 0.0 0.0 11.7 207.7 418.2 2277.4 DEWPOINT (MEAN C) -5.9 -3.7 -2.7 2.2 3.0 1.6 -0.2 1.8 -5.2 -6.5 -0.9 -1.2 -1.5 MIXING RATIO (G/KG) 3.07 3.50 3.89 5.39 5.68 5.10 4.67 5.27 3.30 2.94 4.59 4.26 4.30 VAPOUR PRESSURE (HPA) 4.24 4.83 5.36 7.40 7.80 7.00 6.39 7.21 4.56 4.07 6.34 5.88 5.92 SATURATION DEF. (HPA) 2.11 1.95 3.35 7.64 14.12 24.85 34.21 31.65 26.84 17.83 7.15 2.58 14.52 RELATIVE HUMIDITY (MEAN %) 67 73 64 52 39 24 17 20 16 20 51 71 43 RELATIVE HUMIDITY (MAX. %) 82 89 82 71 55 35 26 30 27 31 66 88 57 RELATIVE HUMIDITY (MIN. %) 49 55 45 37 26 15 9 12 8 10 33 52 29 RELATIVE HUMIDITY (MEAN% 03UTC) 68 79 66 61 47 32 22 26 23 25 55 76 48 RELATIVE HUMIDITY (MEAN% 09UTC) 58 67 51 40 31 17 11 14 9 11 38 58 34 RELATIVE HUMIDITY (MEAN% 15UTC) 72 72 67 47 35 18 13 14 13 19 55 74 42 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 85.1 160.2 209.6 20.5 57.0 0.0 0.0 0.0 0.0 0.0 115.7 105.4 753.5 DAYS WITH PRECIPITATION >=10 3 7 6 0 4 0 0 0 0 0 1 5 26 DAYS WITH PRECIPITATION >= 5 7 11 10 1 4 0 0 0 0 0 4 8 45 DAYS WITH PRECIPITATION >= 1 10 15 16 6 4 0 0 0 0 0 7 11 69 DAYS WITH PRECIPITATION 15 18 19 8 9 1 0 0 0 0 11 17 98 GREATEST DAILY PRECIPITATION 22.0 37.0 72.0 7.0 22.0 0.0 0.0 0.0 0.0 0.0 84.0 23.2 84.0 DAY 2 23 15 24 6 ** ** ** ** ** 8 2 DAY WITH THUNDER STORM 2 2 7 4 7 1 0 0 0 0 6 4 33 DAYS WITH SNOW OR SLEET 11 14 9 0 0 0 0 0 0 0 2 7 43 DAYS WITH DUST 0 0 0 2 6 2 3 3 0 0 0 0 16 WIND DIRECTION (PREVAILING) 180 180 180 270 270 270 270 270 270 270 135 135 270 PREVAILING WIND SPEED(KNOTS) 4.4 4.9 4.6 3.8 5.3 6.6 5.7 4.5 4.8 5.5 8.2 7.6 5.1 PREVAILING WIND PERCENT 9.3 14.7 7.7 10.0 11.3 16.3 19.0 15.3 14.6 12.1 12.9 10.9 9.2 CALMS PERCENT OF WIND 72.2 59.9 62.9 50.4 51.2 47.1 56.0 47.2 54.2 66.1 65.0 76.2 59.1 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 139 163 150 176 195 290 279 333 295 274 154 137 208 VECTOR WIND MAGNITUDE(KNOTS) 0.7 1.6 0.5 0.5 0.4 1.4 1.7 1.0 0.3 0.9 1.5 1.1 0.4 WIND STEADINESES (MEAN %) 53.8 80.0 33.3 21.7 15.4 53.8 70.8 34.5 14.3 56.3 65.2 73.3 19.0 WIND SPEED (MEAN KNOTS) 1.3 2.0 1.5 2.3 2.6 2.6 2.4 2.9 2.1 1.6 2.3 1.5 2.1 FASTEST WIND DIRECTION 160 150 180 40 70 300 240 240 170 300 150 100 150 FASTEST WIND SPEED (KNOTS) 16 19 16 19 23 19 16 17 16 14 29 23 29 DAY 30 24 13 19 8 21 10 6 12 15 24 13 DAYS WITH SKY CLEAR (0-2)/8 10 7 9 13 14 23 31 31 25 29 14 11 217 DAYS WITH P.CLOUDY (3-6)/8 7 7 10 8 12 6 0 0 5 2 12 11 80 DAYS WITH CLOUDY (7-8)/8 14 15 12 9 5 1 0 0 0 0 4 9 69 DAYS WITH VISIBILITY =< 2 KM 3 5 5 0 2 0 0 0 0 0 3 1 19 DURATION OF SUNSHINE HOURS 152.7 108.4 182.0 224.6 250.9 319.9 365.2 353.1 306.6 295.1 191.2 146.7 2896.4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 864.7 863.2 863.6 862.9 862.8 860.5 858.4 860.1 864.0 866.5 867.6 865.1 863.3 MAX. QFE PRESSURE IN HPA 873.0 869.4 871.0 867.8 867.6 866.2 863.3 863.4 867.9 871.4 871.6 870.4 873.0 DAY-HOUR 4-15 15-21 12- 9 20-18 14- 6 11- 9 6- 6 24-18 21- 6 29- 6 4- 6 1- 6 MIN. QFE PRESSURE IN HPA 849.3 854.7 852.0 854.1 855.9 856.1 853.6 855.0 859.6 860.9 858.6 859.9 849.3 DAY-HOUR 30-12 10-12 30-12 17-15 8-12 27-12 19- 0 18-15 5-12 7- 0 24-21 3- 3 MEAN QNH PRESSURE IN HPA 1015.3 1013.6 1014.1 1013.3 1013.1 1010.5 1008.2 1010.1 1014.5 1017.4 1018.6 1015.8 1013.7 MAX. QNH PRESSURE IN HPA 1024.8 1020.7 1022.5 1018.9 1018.7 1017.1 1013.8 1013.9 1019.0 1023.0 1023.2 1021.8 1024.8 DAY-HOUR 4-15 15-21 12- 9 20-18 14- 6 11- 9 6- 6 24-18 21- 6 29- 6 4- 6 1- 6 MIN. QNH PRESSURE IN HPA 997.8 1004.0 1000.9 1003.3 1005.3 1005.6 1002.7 1004.3 1009.5 1011.0 1008.4 1009.9 997.8 DAY-HOUR 30-12 10-12 30-12 17-15 8-12 27-12 19- 0 18-15 5-12 7- 0 24-21 3- 3 MEAN QFF PRESSURE IN HPA 1018.8 1016.5 1015.0 1009.4 1006.2 1000.3 995.9 998.1 1004.7 1010.7 1016.0 1016.8 1009.0 MAX. QFF PRESSURE IN HPA 1034.4 1025.3 1025.7 1014.7 1012.7 1006.9 1001.4 1002.6 1011.6 1018.0 1022.8 1028.7 1034.4 DAY-HOUR 4-15 12-18 12- 6 20-18 14- 6 1-18 12- 9 25- 6 29- 3 29- 6 29- 3 28-18 MIN. QFF PRESSURE IN HPA 1000.1 1002.5 997.1 998.7 999.3 994.4 989.9 992.0 997.9 1003.3 1004.7 1007.0 989.9 DAY-HOUR 30-12 24- 9 30-12 17-15 9-12 27-12 19- 6 19- 0 5-12 7- 0 24-21 3- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 864.5 862.8 863.3 862.4 862.3 860.0 857.8 859.6 863.5 866.0 867.4 865.0 862.9 MAX. QFE PRESSURE IN HPA 871.3 868.3 869.0 866.8 866.2 864.9 862.2 862.4 866.6 870.0 870.5 869.9 871.3 DAY 5 16 12 21 15 11 6 16 27 29 4 1 MIN. QFE PRESSURE IN HPA 856.3 855.3 854.2 857.0 857.1 856.7 853.6 855.1 860.0 860.9 861.3 860.0 853.6 DAY 31 24 31 18 9 28 19 19 5 7 25 3 MEAN QNH PRESSURE IN HPA 1015.1 1013.2 1013.8 1012.7 1012.6 1010.0 1007.5 1009.5 1014.0 1016.8 1018.4 1015.7 1013.3 MAX. QNH PRESSURE IN HPA 1022.9 1019.5 1020.3 1017.7 1017.1 1015.6 1012.5 1012.7 1017.5 1021.4 1022.0 1021.3 1022.9 DAY 5 16 12 21 15 11 6 16 27 29 4 1 MIN. QNH PRESSURE IN HPA 1005.8 1004.6 1003.4 1006.6 1006.7 1006.2 1002.7 1004.4 1010.0 1011.0 1011.5 1010.0 1002.7 DAY 31 24 31 18 9 28 19 19 5 7 25 3 MEAN QFF PRESSURE IN HPA 1018.2 1015.8 1014.5 1008.8 1005.6 999.7 995.1 997.3 1003.9 1009.6 1015.5 1016.2 1008.3 MAX. QFF PRESSURE IN HPA 1028.4 1023.7 1022.9 1012.7 1010.8 1005.2 1000.1 1000.3 1010.1 1015.8 1020.7 1025.2 1028.4 DAY 5 13 12 20 14 6 13 25 27 29 29 29 MIN. QFF PRESSURE IN HPA 1008.2 1003.0 1001.2 1002.9 1001.3 994.5 990.1 992.0 998.0 1003.3 1009.4 1007.0 990.1 DAY 31 24 31 24 23 28 19 19 5 7 22 3 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 864.4 862.7 863.4 862.7 862.6 860.2 858.2 859.9 863.8 866.2 867.5 864.9 863.0 MAX. QFE PRESSURE IN HPA 870.7 868.0 869.5 866.7 866.4 865.3 863.0 862.8 866.8 870.3 870.9 869.7 870.9 DAY 10 14 12 12 14 11 6 16 21 29 4 1 MIN. QFE PRESSURE IN HPA 857.0 855.0 855.0 857.6 858.1 857.1 853.7 855.5 860.2 860.9 861.3 859.9 853.7 DAY 30 24 31 18 9 14 19 19 5 7 25 3 MEAN QNH PRESSURE IN HPA 1015.0 1013.1 1013.8 1013.1 1012.9 1010.3 1007.9 1009.9 1014.4 1017.1 1018.5 1015.6 1013.5 MAX. QNH PRESSURE IN HPA 1022.2 1019.1 1020.8 1017.6 1017.3 1016.0 1013.4 1013.2 1017.7 1021.7 1022.4 1021.0 1022.4 DAY 10 14 12 12 14 11 6 16 21 29 4 1 MIN. QNH PRESSURE IN HPA 1006.6 1004.3 1004.3 1007.3 1007.8 1006.7 1002.8 1004.9 1010.2 1011.0 1011.5 1009.9 1002.8 DAY 30 24 31 18 9 14 19 19 5 7 25 3 MEAN QFF PRESSURE IN HPA 1018.8 1016.3 1015.2 1009.7 1006.3 1000.2 996.0 998.2 1004.9 1011.0 1016.5 1017.1 1009.2 MAX. QFF PRESSURE IN HPA 1030.3 1024.5 1024.3 1014.2 1011.3 1005.8 1000.9 1001.6 1011.6 1017.1 1022.8 1025.2 1030.3 DAY 4 12 12 3 14 11 6 25 29 29 29 29 MIN. QFF PRESSURE IN HPA 1009.9 1002.7 1004.1 1004.4 1001.4 995.1 990.8 993.4 998.8 1004.3 1010.2 1008.1 990.8 DAY 30 24 31 18 9 14 19 19 5 7 25 3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 865.2 863.6 864.3 863.5 863.1 860.7 858.7 860.5 864.6 867.2 868.4 865.8 863.8 MAX. QFE PRESSURE IN HPA 872.1 868.9 870.6 867.5 867.6 866.0 863.3 863.2 867.9 871.4 871.6 870.4 872.1 DAY 4 14 12 21 14 11 6 16 21 29 4 1 MIN. QFE PRESSURE IN HPA 854.5 855.7 856.8 858.7 858.3 857.3 853.8 856.2 861.2 861.7 862.4 861.5 853.8 DAY 30 24 31 18 9 14 19 19 5 7 25 3 MEAN QNH PRESSURE IN HPA 1016.0 1014.1 1014.9 1014.0 1013.6 1010.8 1008.5 1010.6 1015.2 1018.2 1019.6 1016.6 1014.3 MAX. QNH PRESSURE IN HPA 1023.8 1020.1 1022.1 1018.5 1018.7 1016.8 1013.8 1013.6 1019.0 1023.0 1023.2 1021.8 1023.8 DAY 4 14 12 21 14 11 6 16 21 29 4 1 MIN. QNH PRESSURE IN HPA 1003.7 1005.1 1006.4 1008.5 1008.1 1006.9 1002.9 1005.7 1011.4 1011.9 1012.7 1011.7 1002.9 DAY 30 24 31 18 9 14 19 19 5 7 25 3 MEAN QFF PRESSURE IN HPA 1019.8 1017.1 1016.0 1010.2 1006.6 1000.5 996.0 998.6 1005.4 1011.5 1017.2 1017.9 1009.7 MAX. QFF PRESSURE IN HPA 1033.8 1025.3 1025.7 1014.2 1012.7 1006.0 1000.7 1002.6 1011.5 1018.0 1022.5 1026.1 1033.8 DAY 4 13 12 20 14 11 6 25 29 29 28 28 MIN. QFF PRESSURE IN HPA 1007.0 1003.3 1003.2 1005.6 1001.1 995.1 989.9 993.4 1000.8 1004.3 1011.7 1010.1 989.9 DAY 30 24 30 27 9 14 19 19 5 7 22 3 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.0 863.6 864.1 863.4 863.3 860.9 858.7 860.5 864.4 866.9 867.9 865.3 863.7 MAX. QFE PRESSURE IN HPA 872.8 868.8 871.0 867.3 867.6 866.2 863.3 863.1 867.8 870.7 871.0 869.7 872.8 DAY 4 13 12 21 14 11 6 25 21 29 4 1 MIN. QFE PRESSURE IN HPA 851.5 855.0 855.0 858.9 857.8 857.0 854.3 856.4 860.6 861.6 862.6 861.1 851.5 DAY 30 24 30 17 9 27 19 19 5 7 25 3 MEAN QNH PRESSURE IN HPA 1015.7 1014.1 1014.7 1013.9 1013.8 1011.0 1008.5 1010.5 1015.0 1017.8 1019.0 1016.0 1014.2 MAX. QNH PRESSURE IN HPA 1024.6 1020.0 1022.5 1018.3 1018.7 1017.1 1013.8 1013.5 1018.9 1022.2 1022.5 1021.0 1024.6 DAY 4 13 12 21 14 11 6 25 21 29 4 1 MIN. QNH PRESSURE IN HPA 1000.3 1004.3 1004.3 1008.7 1007.5 1006.6 1003.5 1005.9 1010.7 1011.8 1013.0 1011.3 1000.3 DAY 30 24 30 17 9 27 19 19 5 7 25 3 MEAN QFF PRESSURE IN HPA 1018.9 1016.7 1015.4 1009.8 1006.8 1000.6 996.0 998.4 1004.9 1010.6 1015.7 1016.6 1009.2 MAX. QFF PRESSURE IN HPA 1033.2 1025.2 1025.0 1012.8 1012.4 1006.3 1001.4 1002.0 1010.9 1016.4 1020.7 1025.1 1033.2 DAY 4 13 12 1 13 10 12 25 28 29 29 28 MIN. QFF PRESSURE IN HPA 1003.0 1002.5 1000.1 1003.6 1000.4 995.5 990.8 993.3 999.5 1004.2 1009.8 1008.5 990.8 DAY 30 24 30 24 9 27 19 19 5 7 22 3 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 864.0 862.6 863.1 862.5 862.5 860.3 858.3 859.8 863.6 866.1 866.9 864.6 862.9 MAX. QFE PRESSURE IN HPA 872.4 868.3 869.9 865.8 866.5 865.4 862.7 862.3 867.1 869.7 870.2 868.9 872.4 DAY 4 15 12 8 14 1 6 31 21 29 4 11 MIN. QFE PRESSURE IN HPA 849.3 854.7 852.0 856.6 855.9 856.1 854.2 855.2 859.6 861.1 862.0 860.6 849.3 DAY 30 10 30 17 8 27 19 18 5 7 24 15 MEAN QNH PRESSURE IN HPA 1014.5 1013.0 1013.5 1012.9 1012.8 1010.3 1008.1 1009.7 1014.1 1016.9 1017.9 1015.2 1013.2 MAX. QNH PRESSURE IN HPA 1024.1 1019.5 1021.3 1016.6 1017.4 1016.1 1013.1 1012.6 1018.1 1021.0 1021.6 1020.1 1024.1 DAY 4 15 12 8 14 1 6 31 21 29 4 11 MIN. QNH PRESSURE IN HPA 997.8 1004.0 1000.9 1006.1 1005.3 1005.6 1003.4 1004.5 1009.5 1011.3 1012.3 1010.7 997.8 DAY 30 10 30 17 8 27 19 18 5 7 24 15 MEAN QFF PRESSURE IN HPA 1017.6 1015.6 1014.1 1008.8 1005.8 1000.0 995.8 997.7 1004.1 1009.8 1015.0 1015.8 1008.3 MAX. QFF PRESSURE IN HPA 1032.4 1023.8 1022.9 1012.9 1011.3 1006.8 1001.2 1001.1 1010.2 1015.3 1019.8 1025.5 1032.4 DAY 4 12 12 8 14 1 12 31 29 28 29 28 MIN. QFF PRESSURE IN HPA 1000.1 1003.8 997.1 1001.6 999.3 994.4 991.0 992.2 997.9 1003.4 1009.4 1007.9 991.0 DAY 30 24 30 14 9 27 19 18 5 6 7 15 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 864.4 863.0 863.2 862.3 862.3 860.0 858.2 859.7 863.6 866.4 867.3 864.9 862.9 MAX. QFE PRESSURE IN HPA 873.0 868.2 869.4 866.7 865.8 865.1 862.6 862.3 867.1 870.1 870.6 869.3 873.0 DAY 4 15 12 20 14 10 6 31 21 29 4 28 MIN. QFE PRESSURE IN HPA 850.5 856.7 853.9 854.1 856.5 856.3 854.3 855.0 859.6 861.8 861.4 860.9 850.5 DAY 30 10 30 17 8 16 19 18 5 7 24 14 MEAN QNH PRESSURE IN HPA 1015.0 1013.4 1013.6 1012.6 1012.6 1010.1 1008.0 1009.6 1014.1 1017.3 1018.3 1015.6 1013.3 MAX. QNH PRESSURE IN HPA 1024.8 1019.3 1020.7 1017.6 1016.6 1015.8 1013.0 1012.6 1018.1 1021.5 1022.1 1020.6 1024.8 DAY 4 15 12 20 14 10 6 31 21 29 4 28 MIN. QNH PRESSURE IN HPA 999.2 1006.2 1003.0 1003.3 1006.0 1005.8 1003.5 1004.3 1009.5 1012.0 1011.6 1011.0 999.2 DAY 30 10 30 17 8 16 19 18 5 7 24 14 MEAN QFF PRESSURE IN HPA 1018.8 1016.6 1014.8 1009.1 1005.8 1000.1 996.1 998.0 1004.8 1011.2 1016.2 1017.1 1009.0 MAX. QFF PRESSURE IN HPA 1034.4 1025.2 1023.1 1013.7 1010.9 1006.9 1000.6 1001.4 1011.4 1016.6 1021.4 1027.6 1034.4 DAY 4 12 12 20 13 1 12 31 28 28 28 28 MIN. QFF PRESSURE IN HPA 1001.9 1005.8 1001.3 998.7 999.7 994.8 991.6 992.6 998.2 1005.6 1010.0 1009.5 991.6 DAY 30 24 30 17 8 27 19 18 4 6 24 15 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 864.9 863.6 863.8 863.1 863.1 860.9 858.9 860.6 864.3 867.0 867.7 865.3 863.6 MAX. QFE PRESSURE IN HPA 873.0 869.1 869.0 867.8 867.2 865.7 862.6 863.4 867.5 870.7 871.1 869.9 873.0 DAY 4 15 12 20 14 10 6 24 21 29 18 28 MIN. QFE PRESSURE IN HPA 853.1 858.1 853.9 855.7 856.9 856.7 855.2 856.1 860.2 863.0 860.8 860.9 853.1 DAY 30 24 30 17 8 16 19 18 4 6 24 15 MEAN QNH PRESSURE IN HPA 1015.6 1014.1 1014.3 1013.6 1013.6 1011.0 1008.8 1010.7 1014.9 1017.9 1018.8 1016.0 1014.1 MAX. QNH PRESSURE IN HPA 1024.8 1020.4 1020.3 1018.9 1018.2 1016.5 1013.0 1013.9 1018.5 1022.2 1022.6 1021.3 1024.8 DAY 4 15 12 20 14 10 6 24 21 29 18 28 MIN. QNH PRESSURE IN HPA 1002.1 1007.8 1003.0 1005.1 1006.5 1006.2 1004.5 1005.6 1010.2 1013.4 1010.9 1011.0 1002.1 DAY 30 24 30 17 8 16 19 18 4 6 24 15 MEAN QFF PRESSURE IN HPA 1019.4 1017.1 1015.3 1009.6 1006.5 1000.7 996.3 998.7 1005.1 1011.3 1016.4 1017.3 1009.5 MAX. QFF PRESSURE IN HPA 1033.4 1025.3 1022.3 1014.7 1011.8 1006.9 1001.0 1002.6 1011.3 1017.2 1021.2 1028.7 1033.4 DAY 4 12 11 20 13 1 12 31 28 29 30 28 MIN. QFF PRESSURE IN HPA 1005.1 1007.6 1000.8 1001.7 999.9 994.9 992.0 993.1 999.4 1005.4 1008.4 1008.4 992.0 DAY 30 24 30 17 8 16 19 18 4 6 24 15 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 864.9 863.5 863.7 863.1 863.0 860.8 858.6 860.4 864.1 866.7 867.5 865.2 863.5 MAX. QFE PRESSURE IN HPA 872.2 869.4 869.4 867.5 867.4 865.4 862.6 863.3 866.9 870.2 870.8 869.9 872.2 DAY 4 15 12 20 14 10 5 31 21 29 3 10 MIN. QFE PRESSURE IN HPA 854.2 857.1 854.2 856.8 857.3 857.4 854.8 855.5 860.2 862.7 858.6 861.0 854.2 DAY 30 24 30 17 8 27 26 18 4 6 24 2 MEAN QNH PRESSURE IN HPA 1015.6 1014.0 1014.2 1013.5 1013.4 1010.9 1008.4 1010.4 1014.6 1017.6 1018.6 1016.0 1013.9 MAX. QNH PRESSURE IN HPA 1023.9 1020.7 1020.7 1018.5 1018.4 1016.1 1013.0 1013.8 1017.9 1021.6 1022.3 1021.3 1023.9 DAY 4 15 12 20 14 10 5 31 21 29 3 10 MIN. QNH PRESSURE IN HPA 1003.4 1006.7 1003.4 1006.4 1006.9 1007.0 1004.1 1004.9 1010.2 1013.1 1008.4 1011.1 1003.4 DAY 30 24 30 17 8 27 26 18 4 6 24 2 MEAN QFF PRESSURE IN HPA 1018.8 1016.7 1014.8 1009.3 1006.2 1000.5 995.9 998.1 1004.5 1010.4 1015.4 1016.5 1008.9 MAX. QFF PRESSURE IN HPA 1031.0 1024.7 1022.8 1013.1 1012.5 1006.0 1001.4 1002.1 1010.5 1015.8 1021.2 1026.3 1031.0 DAY 4 12 11 19 13 5 12 31 28 28 30 28 MIN. QFF PRESSURE IN HPA 1005.8 1006.7 1000.0 1002.9 1000.4 995.7 991.6 992.2 998.8 1005.0 1004.7 1008.1 991.6 DAY 30 24 30 17 8 27 26 18 4 6 24 2 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 3.0 4.6 8.2 13.5 18.4 25.4 31.7 30.6 27.7 20.3 11.3 9.7 17.0 MINIMUN AIR TEMPERATURE (C) -0.4 1.0 3.7 9.1 13.5 19.1 24.1 22.6 19.8 14.1 6.5 4.9 11.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 10 27 28 11 0 0 0 77 DAYS WITH MINIMUM TEMP. <=-4 2 2 0 0 0 0 0 0 0 0 1 0 5 DAYS WITH FREEZING MIN.<= 0 20 13 4 0 0 0 0 0 0 0 4 0 41 TEMPERATURE RECORDS LOWEST(C) -7.4 -5.4 -1.6 4.8 7.4 14.2 19.2 19.6 14.4 9.6 -6.2 1.2 -7.4 DAY 17 16 22 13 3 5 7 13 29 29 14 5 MAXIMUM AIR TEMPERATURE (C) 7.2 9.1 12.7 18.0 23.1 31.0 35.6 34.6 31.9 24.4 15.0 13.4 21.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 19 31 31 25 0 0 0 106 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 11.8 17.8 21.6 26.0 28.4 35.6 38.6 36.6 35.6 29.4 21.4 17.6 38.6 DAY 27 27 31 19 26 30 16 30 1 1 8 22 DIF. BETWEEN (MAX.-MIN.) (C) 7.6 8.1 9.0 8.9 9.6 11.9 11.5 12.0 12.1 10.3 8.5 8.5 9.8 MEAN DAILY TEMP. (MDT) (C) 3.4 5.1 8.2 13.5 18.3 25.1 29.8 28.6 25.9 19.3 10.7 9.1 16.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 12.7 124.0 274.2 235.4 146.2 4.3 0.0 0.0 796.9 HEATING DEG. DAYS(BASE 18 0C) 452.1 361.9 304.2 142.2 46.3 0.0 0.0 0.0 0.0 17.4 218.6 274.4 1817.0 DEWPOINT (MEAN C) -2.9 -3.8 -2.2 2.9 5.3 -0.4 0.7 4.3 -2.4 0.6 0.6 -0.7 0.2 MIXING RATIO (G/KG) 3.72 3.60 3.97 5.71 6.68 4.48 5.07 6.21 3.99 4.87 5.07 4.45 4.82 VAPOUR PRESSURE (HPA) 5.14 4.96 5.47 7.85 9.16 6.15 6.92 8.50 5.49 6.74 7.00 6.16 6.63 SATURATION DEF. (HPA) 2.63 3.91 5.91 8.14 12.83 27.45 40.76 36.24 32.52 17.89 6.91 6.12 16.77 RELATIVE HUMIDITY (MEAN %) 67 59 52 54 46 21 15 20 15 31 52 52 40 RELATIVE HUMIDITY (MAX. %) 82 77 72 71 64 34 24 28 23 42 67 69 54 RELATIVE HUMIDITY (MIN. %) 49 41 33 37 30 12 10 15 10 23 40 37 28 RELATIVE HUMIDITY (MEAN% 03UTC) 70 63 59 63 54 27 23 27 22 37 63 58 47 RELATIVE HUMIDITY (MEAN% 09UTC) 55 45 38 43 34 13 12 16 11 26 42 41 31 RELATIVE HUMIDITY (MEAN% 15UTC) 72 60 49 49 40 14 14 18 14 31 59 64 40 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 122.7 59.6 75.5 154.4 75.2 1.0 0.0 0.0 0.0 45.4 62.4 95.0 691.2 DAYS WITH PRECIPITATION >=10 3 1 2 6 2 0 0 0 0 2 2 2 20 DAYS WITH PRECIPITATION >= 5 4 4 3 11 5 0 0 0 0 2 4 5 38 DAYS WITH PRECIPITATION >= 1 9 9 7 13 7 1 0 0 0 4 10 7 67 DAYS WITH PRECIPITATION 11 11 9 16 12 1 2 0 0 4 11 7 84 GREATEST DAILY PRECIPITATION 59.0 26.6 38.0 25.2 35.0 1.0 0.0 0.0 0.0 25.0 25.0 40.0 59.0 DAY 7 21 5 28 13 1 ** ** ** 30 3 15 DAY WITH THUNDER STORM 1 1 3 11 7 1 0 0 0 2 2 0 28 DAYS WITH SNOW OR SLEET 6 1 1 0 0 0 0 0 0 0 0 1 9 DAYS WITH DUST 1 0 2 1 5 3 0 0 0 0 0 0 12 WIND DIRECTION (PREVAILING) 135 135 135 135 45 270 270 225 270 270 135 135 225 PREVAILING WIND SPEED(KNOTS) 7.1 8.1 9.2 8.1 5.2 8.4 7.4 6.8 7.9 6.3 9.0 6.7 6.7 PREVAILING WIND PERCENT 8.1 16.1 12.1 11.7 11.7 16.7 18.7 16.1 22.0 15.7 20.0 7.1 10.3 CALMS PERCENT OF WIND 67.7 58.5 55.6 52.9 49.6 48.3 32.3 30.3 39.3 53.6 56.0 71.0 52.2 NO. OF WIND OBSERVATION 248 224 248 240 248 240 155 155 150 153 150 155 2366 VECTOR WIND DIRECTION (MEAN) 141 162 173 177 204 273 275 220 256 229 159 140 212 VECTOR WIND MAGNITUDE(KNOTS) 0.8 1.5 1.1 1.5 0.6 1.7 1.8 2.6 3.2 1.6 2.4 0.8 1.1 WIND STEADINESES (MEAN %) 36.4 51.7 31.4 44.1 17.6 44.7 37.5 44.1 72.7 57.1 75.0 57.1 31.4 WIND SPEED (MEAN KNOTS) 2.2 2.9 3.5 3.4 3.4 3.8 4.8 5.9 4.4 2.8 3.2 1.4 3.5 FASTEST WIND DIRECTION 180 130 20 130 90 300 260 330 230 280 140 120 300 FASTEST WIND SPEED (KNOTS) 19 19 31 17 19 35 17 19 17 14 17 16 35 DAY 8 10 23 1 1 13 1 20 24 2 24 8 DAYS WITH SKY CLEAR (0-2)/8 16 14 13 11 7 29 24 27 29 24 13 15 222 DAYS WITH P.CLOUDY (3-6)/8 10 5 9 10 16 1 7 4 1 4 9 11 87 DAYS WITH CLOUDY (7-8)/8 5 9 9 9 8 0 0 0 0 3 8 5 56 DAYS WITH VISIBILITY =< 2 KM 1 3 0 0 1 1 0 0 0 1 1 0 8 DURATION OF SUNSHINE HOURS 184.5 168.5 222.8 233.6 ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.4 864.5 863.5 864.0 863.7 860.9 858.4 860.5 862.8 867.8 866.2 868.1 863.8 MAX. QFE PRESSURE IN HPA 872.3 871.3 869.9 870.3 868.8 864.3 862.4 864.5 866.3 872.7 871.2 874.6 874.6 DAY-HOUR 27- 6 7-18 30- 6 17- 6 15- 9 9-21 26-12 19- 3 30- 9 17- 6 21- 6 26- 6 MIN. QFE PRESSURE IN HPA 855.6 855.0 855.0 857.1 857.1 856.1 854.1 857.1 859.2 863.6 858.0 862.2 854.1 DAY-HOUR 8- 0 2-15 5-12 26-12 6- 0 26- 0 10-12 13-12 8- 3 3-12 11- 3 4-12 MEAN QNH PRESSURE IN HPA 1016.1 1015.1 1014.0 1014.6 1014.2 1011.0 1008.2 1010.6 1013.2 1018.8 1017.1 1019.2 1014.3 MAX. QNH PRESSURE IN HPA 1024.0 1022.9 1021.3 1021.7 1020.0 1014.9 1012.7 1015.1 1017.2 1024.5 1022.8 1026.6 1026.6 DAY-HOUR 27- 6 7-18 30- 6 17- 6 15- 9 9-21 26-12 19- 3 30- 9 17- 6 21- 6 26- 6 MIN. QNH PRESSURE IN HPA 1005.0 1004.3 1004.3 1006.7 1006.7 1005.6 1003.3 1006.7 1009.1 1014.1 1007.7 1012.5 1003.3 DAY-HOUR 8- 0 2-15 5-12 26-12 6- 0 26- 0 10-12 13-12 8- 3 3-12 11- 3 4-12 MEAN QFF PRESSURE IN HPA 1017.9 1015.9 1012.7 1010.2 1007.0 1000.5 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1025.4 1026.5 1019.7 1015.7 1014.2 1006.5 ****** ****** ****** ****** ****** ****** ****** DAY-HOUR 27- 6 7-18 22-18 13-21 14-15 5-12 **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA 1002.1 1002.1 1002.4 1002.2 997.9 993.7 ****** ****** ****** ****** ****** ****** ****** DAY-HOUR 8- 0 2-18 5-12 26-12 31- 0 26- 0 **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 865.3 864.3 863.1 863.6 863.1 860.4 ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 871.5 869.8 868.3 869.0 866.3 863.3 ****** ****** ****** ****** ****** ****** ****** DAY 27 8 30 17 15 10 ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 855.6 855.1 857.9 858.1 857.1 856.1 ****** ****** ****** ****** ****** ****** ****** DAY 8 3 6 26 6 26 ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1016.0 1014.9 1013.5 1014.1 1013.5 1010.5 ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1023.1 1021.2 1019.5 1020.3 1017.2 1013.8 ****** ****** ****** ****** ****** ****** ****** DAY 27 8 30 17 15 10 ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1005.0 1004.4 1007.6 1007.8 1006.7 1005.6 ****** ****** ****** ****** ****** ****** ****** DAY 8 3 6 26 6 26 ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1017.5 1015.5 1012.0 1009.5 1006.4 1000.1 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1024.1 1024.3 1017.5 1013.9 1012.3 1005.1 ****** ****** ****** ****** ****** ****** ****** DAY 26 8 23 16 15 5 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1002.1 1003.1 1003.4 1002.7 997.9 993.7 ****** ****** ****** ****** ****** ****** ****** DAY 8 3 8 26 31 26 ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 865.1 864.3 863.2 863.9 863.3 860.6 858.3 860.4 862.5 867.6 866.0 867.9 863.6 MAX. QFE PRESSURE IN HPA 871.5 869.9 869.1 869.3 866.7 863.0 861.8 864.5 864.9 871.7 870.4 873.0 873.0 DAY 27 8 30 16 15 10 26 19 19 17 21 26 MIN. QFE PRESSURE IN HPA 856.0 855.5 858.3 858.1 858.1 856.3 854.3 857.4 859.2 864.2 858.0 863.3 854.3 DAY 8 3 5 26 6 26 10 13 8 7 11 8 MEAN QNH PRESSURE IN HPA 1015.8 1014.9 1013.7 1014.4 1013.8 1010.6 1008.0 1010.4 1012.9 1018.7 1016.8 1019.0 1014.1 MAX. QNH PRESSURE IN HPA 1023.1 1021.3 1020.4 1020.6 1017.6 1013.4 1012.0 1015.1 1015.6 1023.3 1021.8 1024.8 1024.8 DAY 27 8 30 16 15 10 26 19 19 17 21 26 MIN. QNH PRESSURE IN HPA 1005.4 1004.9 1008.1 1007.8 1007.8 1005.8 1003.5 1007.0 1009.1 1014.8 1007.7 1013.8 1003.5 DAY 8 3 5 26 6 26 10 13 8 7 11 8 MEAN QFF PRESSURE IN HPA 1018.1 1016.2 1012.8 1010.4 1007.0 1000.3 995.4 998.6 1002.7 1012.1 1015.2 1018.0 1008.9 MAX. QFF PRESSURE IN HPA 1025.1 1025.4 1018.2 1015.2 1012.6 1005.4 999.7 1004.3 1007.3 1018.9 1022.7 1024.3 1025.4 DAY 27 8 23 16 15 5 26 19 30 30 30 26 MIN. QFF PRESSURE IN HPA 1003.3 1004.3 1004.7 1003.5 999.0 993.9 989.7 995.2 999.2 1007.0 1003.3 1010.7 989.7 DAY 8 3 5 26 31 26 10 4 8 3 11 8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 866.1 865.2 864.2 864.6 864.1 861.2 858.8 860.9 863.4 868.5 866.8 868.7 864.4 MAX. QFE PRESSURE IN HPA 872.3 870.2 869.9 870.3 868.5 864.0 862.3 864.4 866.2 872.7 871.2 874.6 874.6 DAY 27 8 30 17 15 10 26 19 23 17 21 26 MIN. QFE PRESSURE IN HPA 857.3 856.8 858.4 858.7 859.2 857.4 854.6 857.8 860.1 865.1 860.0 863.6 854.6 DAY 8 3 5 26 31 26 10 13 8 3 11 4 MEAN QNH PRESSURE IN HPA 1016.9 1015.9 1014.8 1015.3 1014.6 1011.3 1008.6 1011.0 1013.9 1019.7 1017.8 1019.9 1015.0 MAX. QNH PRESSURE IN HPA 1024.0 1021.6 1021.3 1021.7 1019.7 1014.6 1012.6 1015.0 1017.1 1024.5 1022.8 1026.6 1026.6 DAY 27 8 30 17 15 10 26 19 23 17 21 26 MIN. QNH PRESSURE IN HPA 1006.9 1006.4 1008.2 1008.5 1009.1 1007.0 1003.8 1007.5 1010.1 1015.8 1010.0 1014.1 1003.8 DAY 8 3 5 26 31 26 10 13 8 3 11 4 MEAN QFF PRESSURE IN HPA 1019.0 1017.0 1013.6 1010.8 1007.5 1000.6 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1025.4 1025.2 1019.7 1015.6 1014.1 1005.9 ****** ****** ****** ****** ****** ****** ****** DAY 27 8 23 6 15 5 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1005.1 1006.3 1005.4 1003.8 999.4 994.9 ****** ****** ****** ****** ****** ****** ****** DAY 8 3 5 26 31 26 ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.7 864.7 864.0 864.5 864.2 861.4 858.8 860.9 863.3 868.2 866.6 868.5 864.2 MAX. QFE PRESSURE IN HPA 871.5 870.0 869.4 870.1 868.8 864.0 862.1 864.0 866.3 872.5 870.9 874.4 874.4 DAY 27 7 30 17 15 10 29 19 30 17 21 26 MIN. QFE PRESSURE IN HPA 857.0 856.9 856.2 859.2 858.1 857.5 854.4 857.2 860.3 864.2 860.8 863.3 854.4 DAY 8 3 5 25 2 26 10 13 8 3 11 4 MEAN QNH PRESSURE IN HPA 1016.5 1015.4 1014.5 1015.2 1014.7 1011.5 1008.6 1011.0 1013.7 1019.3 1017.5 1019.7 1014.8 MAX. QNH PRESSURE IN HPA 1023.1 1021.4 1020.7 1021.5 1020.0 1014.6 1012.4 1014.6 1017.2 1024.2 1022.4 1026.4 1026.4 DAY 27 7 30 17 15 10 29 19 30 17 21 26 MIN. QNH PRESSURE IN HPA 1006.6 1006.5 1005.7 1009.1 1007.8 1007.2 1003.6 1006.8 1010.3 1014.8 1010.9 1013.8 1003.6 DAY 8 3 5 25 2 26 10 13 8 3 11 4 MEAN QFF PRESSURE IN HPA 1017.9 1015.9 1012.9 1010.4 1007.4 1000.9 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1024.1 1024.1 1018.6 1014.4 1014.2 1005.8 ****** ****** ****** ****** ****** ****** ****** DAY 26 7 23 16 15 5 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1004.1 1007.1 1002.7 1004.4 1000.1 994.8 ****** ****** ****** ****** ****** ****** ****** DAY 8 3 5 25 2 26 ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 864.7 863.7 862.9 863.7 863.7 860.9 858.3 860.3 862.5 867.2 865.7 867.6 863.4 MAX. QFE PRESSURE IN HPA 870.3 869.8 868.1 869.4 867.8 863.8 862.4 863.1 866.0 872.2 870.0 873.2 873.2 DAY 26 7 30 16 15 5 26 8 30 17 21 26 MIN. QFE PRESSURE IN HPA 856.2 856.4 855.0 857.1 859.1 857.0 854.1 857.1 860.2 863.6 860.3 862.2 854.1 DAY 8 3 5 26 2 26 10 13 7 3 10 4 MEAN QNH PRESSURE IN HPA 1015.3 1014.2 1013.3 1014.2 1014.2 1011.0 1008.1 1010.3 1012.8 1018.2 1016.5 1018.6 1013.9 MAX. QNH PRESSURE IN HPA 1021.7 1021.2 1019.2 1020.7 1018.9 1014.3 1012.7 1013.5 1016.8 1023.9 1021.4 1025.0 1025.0 DAY 26 7 30 16 15 5 26 8 30 17 21 26 MIN. QNH PRESSURE IN HPA 1005.7 1005.9 1004.3 1006.7 1009.0 1006.6 1003.3 1006.7 1010.2 1014.1 1010.3 1012.5 1003.3 DAY 8 3 5 26 2 26 10 13 7 3 10 4 MEAN QFF PRESSURE IN HPA 1016.7 1014.7 1011.8 1009.7 1007.0 1000.5 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1022.9 1023.8 1016.7 1014.0 1014.1 1006.5 ****** ****** ****** ****** ****** ****** ****** DAY 26 7 23 15 14 5 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1003.0 1003.9 1002.4 1002.2 999.0 994.3 ****** ****** ****** ****** ****** ****** ****** DAY 8 2 5 26 30 26 ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.0 864.1 863.2 863.7 863.5 860.6 858.2 860.1 862.5 867.4 866.0 867.9 863.5 MAX. QFE PRESSURE IN HPA 871.0 870.6 868.3 869.4 867.6 863.3 861.4 863.2 866.0 872.0 870.4 873.6 873.6 DAY 26 7 30 16 14 9 26 18 30 17 20 26 MIN. QFE PRESSURE IN HPA 856.8 855.0 855.9 857.4 859.2 856.6 854.4 857.4 860.3 863.8 860.0 862.7 854.4 DAY 8 2 5 25 30 25 10 3 7 3 10 4 MEAN QNH PRESSURE IN HPA 1015.7 1014.7 1013.6 1014.2 1013.9 1010.7 1007.9 1010.2 1012.9 1018.4 1016.8 1019.0 1014.0 MAX. QNH PRESSURE IN HPA 1022.5 1022.1 1019.5 1020.7 1018.7 1013.8 1011.6 1013.6 1016.8 1023.7 1021.8 1025.5 1025.5 DAY 26 7 30 16 14 9 26 18 30 17 20 26 MIN. QNH PRESSURE IN HPA 1006.4 1004.3 1005.3 1007.0 1009.1 1006.1 1003.6 1007.0 1010.3 1014.3 1010.0 1013.1 1003.6 DAY 8 2 5 25 30 25 10 3 7 3 10 4 MEAN QFF PRESSURE IN HPA 1017.8 1015.9 1012.7 1010.2 1007.1 1000.4 995.3 998.2 1002.7 1011.9 1015.2 1018.0 1008.8 MAX. QFF PRESSURE IN HPA 1024.6 1025.5 1018.1 1014.7 1014.2 1004.9 999.2 1002.7 1009.0 1017.5 1022.7 1024.4 1025.5 DAY 26 7 22 16 14 5 26 18 30 30 29 26 MIN. QFF PRESSURE IN HPA 1005.1 1002.3 1002.4 1002.4 998.8 994.1 989.9 994.7 999.2 1006.3 1006.2 1013.1 989.9 DAY 8 2 5 25 30 26 10 3 2 3 10 4 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 865.6 864.7 864.0 864.3 863.9 861.3 ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 871.6 871.3 869.0 869.9 868.2 864.2 ****** ****** ****** ****** ****** ****** ****** DAY 26 7 30 16 14 9 ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 857.8 855.0 858.0 858.3 859.1 857.3 ****** ****** ****** ****** ****** ****** ****** DAY 8 2 5 26 5 25 ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1016.4 1015.3 1014.5 1014.9 1014.4 1011.4 ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1023.2 1022.9 1020.3 1021.3 1019.3 1014.8 ****** ****** ****** ****** ****** ****** ****** DAY 26 7 30 16 14 9 ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1007.5 1004.3 1007.7 1008.1 1009.0 1006.9 ****** ****** ****** ****** ****** ****** ****** DAY 8 2 5 26 5 25 ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1018.3 1016.4 1013.2 1010.5 1007.2 1000.7 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1024.7 1026.5 1019.7 1014.9 1014.2 1005.5 ****** ****** ****** ****** ****** ****** ****** DAY 26 7 22 15 14 5 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1006.3 1002.1 1004.3 1003.4 999.7 994.9 ****** ****** ****** ****** ****** ****** ****** DAY 7 2 7 25 30 25 ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 865.6 864.8 863.8 864.2 863.8 861.2 ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 871.8 871.0 869.1 869.8 867.8 864.3 ****** ****** ****** ****** ****** ****** ****** DAY 26 7 30 15 14 9 ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 856.5 856.0 858.3 858.8 859.0 857.3 ****** ****** ****** ****** ****** ****** ****** DAY 7 2 7 26 30 25 ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1016.3 1015.5 1014.4 1014.8 1014.3 1011.4 ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1023.4 1022.5 1020.4 1021.2 1018.9 1014.9 ****** ****** ****** ****** ****** ****** ****** DAY 26 7 30 15 14 9 ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1006.0 1005.4 1008.1 1008.6 1008.9 1006.9 ****** ****** ****** ****** ****** ****** ****** DAY 7 2 7 26 30 25 ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1017.7 1015.8 1012.7 1010.1 1006.8 1000.6 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1024.3 1025.7 1018.4 1015.7 1013.8 1005.6 ****** ****** ****** ****** ****** ****** ****** DAY 26 7 13 13 14 4 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1003.0 1004.1 1003.6 1004.2 998.9 994.9 ****** ****** ****** ****** ****** ****** ****** DAY 7 2 7 25 30 25 ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 7.3 5.9 10.7 18.4 22.8 27.9 30.6 30.2 26.5 19.8 11.3 4.1 18.0 MINIMUN AIR TEMPERATURE (C) 3.3 1.5 5.4 12.3 15.5 20.1 22.3 21.6 20.0 14.6 7.1 0.1 12.0 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 14 27 20 12 0 0 0 75 DAYS WITH MINIMUM TEMP. <=-4 0 1 0 0 0 0 0 0 0 0 0 4 5 DAYS WITH FREEZING MIN.<= 0 3 6 0 0 0 0 0 0 0 0 0 14 23 TEMPERATURE RECORDS LOWEST(C) -0.8 -4.0 0.6 6.0 9.0 13.8 20.0 19.0 16.0 9.0 2.6 -9.4 -9.4 DAY 27 18 15 3 7 29 20 11 28 20 9 7 MAXIMUM AIR TEMPERATURE (C) 10.9 9.7 14.2 22.2 26.4 31.7 34.8 34.6 30.8 23.4 14.6 7.7 21.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 10 24 31 31 21 0 0 0 117 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 2 2 TEMPERATURE RECORDS HIGHEST(C) 17.0 15.4 21.0 28.0 34.8 36.0 36.5 38.2 34.0 27.4 20.0 14.4 38.2 DAY 1 27 31 21 31 9 24 18 1 5 2 28 DIF. BETWEEN (MAX.-MIN.) (C) 7.6 8.2 8.8 9.9 10.9 11.6 12.5 13.0 10.8 8.8 7.5 7.6 9.7 MEAN DAILY TEMP. (MDT) (C) 7.1 5.6 9.8 17.2 20.9 25.9 28.6 28.1 25.4 19.0 10.9 3.9 16.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 4.5 51.4 147.0 235.0 220.6 132.8 5.6 0.0 0.0 797.1 HEATING DEG. DAYS(BASE 18 0C) 337.9 347.8 255.2 47.1 17.4 0.0 0.0 0.0 0.0 22.3 213.7 437.6 1678.9 DEWPOINT (MEAN C) -1.0 -2.8 -0.4 2.3 -0.8 2.6 5.0 -0.9 1.7 4.9 5.0 -3.7 1.0 MIXING RATIO (G/KG) 4.46 3.78 4.47 5.59 4.39 5.85 6.53 4.38 5.27 6.72 6.65 3.62 5.14 VAPOUR PRESSURE (HPA) 6.15 5.21 6.16 7.69 6.05 7.97 8.89 6.00 7.25 9.25 9.14 5.01 7.06 SATURATION DEF. (HPA) 4.38 4.29 7.10 14.14 22.76 30.57 36.08 38.05 28.27 14.44 4.52 3.45 17.34 RELATIVE HUMIDITY (MEAN %) 61 58 50 39 24 23 21 15 22 43 68 61 40 RELATIVE HUMIDITY (MAX. %) 76 74 69 58 35 38 32 24 36 55 82 75 55 RELATIVE HUMIDITY (MIN. %) 47 43 36 26 17 15 14 10 15 34 55 46 30 RELATIVE HUMIDITY (MEAN% 03UTC) 68 70 64 53 35 35 32 24 32 49 76 68 51 RELATIVE HUMIDITY (MEAN% 09UTC) 50 48 39 31 20 21 16 11 19 37 59 54 34 RELATIVE HUMIDITY (MEAN% 15UTC) 68 57 49 36 21 18 18 12 20 46 75 69 41 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 145.2 104.3 66.7 62.1 4.9 0.0 0.0 0.0 1.0 83.7 431.3 97.5 996.7 DAYS WITH PRECIPITATION >=10 2 3 2 3 0 0 0 0 0 4 11 4 29 DAYS WITH PRECIPITATION >= 5 7 4 4 5 0 0 0 0 0 4 13 8 45 DAYS WITH PRECIPITATION >= 1 10 10 8 6 1 0 0 0 1 8 16 10 70 DAYS WITH PRECIPITATION 14 14 17 10 4 0 0 0 3 10 16 15 103 GREATEST DAILY PRECIPITATION 81.0 53.0 26.0 18.0 4.0 0.0 0.0 0.0 1.0 31.0 103.0 20.0 103.0 DAY 16 1 12 27 6 ** ** ** 22 20 23 16 DAY WITH THUNDER STORM 3 3 3 3 1 0 0 0 2 5 10 2 32 DAYS WITH SNOW OR SLEET 5 5 0 0 0 0 0 0 0 0 0 5 15 DAYS WITH DUST 0 0 2 3 7 1 3 0 2 0 0 0 18 WIND DIRECTION (PREVAILING) 135 225 135 225 270 225 225 270 270 45 135 135 225 PREVAILING WIND SPEED(KNOTS) 7.0 4.8 8.0 7.9 7.7 9.1 9.2 9.4 8.2 7.1 7.5 6.3 7.8 PREVAILING WIND PERCENT 17.4 9.4 14.8 14.7 19.4 20.7 31.0 27.7 18.0 11.0 26.0 14.8 14.0 CALMS PERCENT OF WIND 52.9 53.2 43.2 45.3 36.8 31.3 36.8 36.1 34.0 55.5 49.3 56.8 44.2 NO. OF WIND OBSERVATION 155 139 155 150 155 150 155 155 150 155 150 155 1824 VECTOR WIND DIRECTION (MEAN) 119 165 164 198 230 262 244 256 241 230 138 128 219 VECTOR WIND MAGNITUDE(KNOTS) 1.4 0.6 1.9 1.1 2.8 3.0 3.5 4.3 1.4 0.2 2.4 1.1 1.3 WIND STEADINESES (MEAN %) 50.0 21.4 50.0 26.8 53.8 50.8 64.8 81.1 26.9 6.7 77.4 42.3 31.7 WIND SPEED (MEAN KNOTS) 2.8 2.8 3.8 4.1 5.2 5.9 5.4 5.3 5.2 3.0 3.1 2.6 4.1 FASTEST WIND DIRECTION 140 90 150 130 240 330 60 310 160 230 150 160 240 FASTEST WIND SPEED (KNOTS) 19 19 23 21 29 19 17 19 19 23 21 17 29 DAY 22 28 11 1 4 16 1 17 10 1 24 19 DAYS WITH SKY CLEAR (0-2)/8 11 10 12 16 18 30 31 31 22 14 8 12 215 DAYS WITH P.CLOUDY (3-6)/8 9 11 13 7 12 0 0 0 8 11 8 10 89 DAYS WITH CLOUDY (7-8)/8 11 7 6 7 1 0 0 0 0 6 14 9 61 DAYS WITH VISIBILITY =< 2 KM 2 2 1 1 1 0 0 0 0 3 8 2 20 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.1 863.6 863.8 864.3 863.1 858.4 855.8 858.0 864.1 867.6 865.7 867.4 863.1 MAX. QFE PRESSURE IN HPA 871.6 869.5 869.7 868.9 867.8 862.1 857.5 861.4 870.2 871.1 873.0 871.8 873.0 DAY-HOUR 28- 6 26- 6 18- 6 15- 6 8- 6 17- 9 1- 6 8- 9 23- 9 11- 6 2- 6 21-15 MIN. QFE PRESSURE IN HPA 855.6 856.1 851.3 859.2 858.1 855.1 853.5 854.4 857.0 864.2 856.5 855.9 851.3 DAY-HOUR 16- 3 11-15 11-15 26-15 4- 3 28- 3 31- 3 1- 3 1- 3 3-12 25-12 3-15 MEAN QNH PRESSURE IN HPA 1015.8 1014.1 1014.3 1014.9 1013.5 1008.2 1005.2 1007.7 1014.7 1018.7 1016.5 1018.4 1013.5 MAX. QNH PRESSURE IN HPA 1023.2 1020.8 1021.0 1020.1 1018.9 1012.4 1007.2 1011.6 1021.6 1022.6 1024.8 1023.4 1024.8 DAY-HOUR 28- 6 26- 6 18- 6 15- 6 8- 6 17- 9 1- 6 8- 9 23- 9 11- 6 2- 6 21-15 MIN. QNH PRESSURE IN HPA 1005.0 1005.6 1000.1 1009.1 1007.8 1004.4 1002.6 1003.6 1006.6 1014.8 1006.0 1005.3 1000.1 DAY-HOUR 16- 3 11-15 11-15 26-15 4- 3 28- 3 31- 3 1- 3 1- 3 3-12 25-12 3-15 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 864.9 863.2 863.5 864.2 862.9 858.2 855.6 857.7 863.9 867.4 865.7 866.9 862.8 MAX. QFE PRESSURE IN HPA 870.3 868.7 868.9 868.2 867.0 861.2 857.3 860.5 869.8 870.3 871.6 870.7 871.6 DAY 28 26 18 15 17 17 1 15 24 20 2 10 MIN. QFE PRESSURE IN HPA 855.6 856.1 853.7 860.3 858.1 855.1 853.5 854.4 857.0 864.4 857.7 856.9 853.5 DAY 16 12 7 30 4 28 31 1 1 6 17 4 MEAN QNH PRESSURE IN HPA 1015.6 1013.6 1013.9 1014.8 1013.3 1007.9 1005.0 1007.4 1014.4 1018.5 1016.5 1017.9 1013.2 MAX. QNH PRESSURE IN HPA 1021.7 1019.9 1020.1 1019.3 1018.0 1011.4 1006.9 1010.6 1021.2 1021.7 1023.2 1022.2 1023.2 DAY 28 26 18 15 17 17 1 15 24 20 2 10 MIN. QNH PRESSURE IN HPA 1005.0 1005.6 1002.8 1010.3 1007.8 1004.4 1002.6 1003.6 1006.6 1015.0 1007.4 1006.5 1002.6 DAY 16 12 7 30 4 28 31 1 1 6 17 4 MEAN QFF PRESSURE IN HPA 1015.5 1014.4 1012.2 1008.8 1005.5 997.0 992.9 995.8 1004.4 1011.6 1014.1 1019.9 1007.7 MAX. QFF PRESSURE IN HPA 1023.4 1021.3 1019.1 1014.0 1012.5 1001.7 995.7 998.5 1012.4 1016.4 1021.7 1027.4 1027.4 DAY 28 4 18 17 8 18 1 8 23 20 10 7 MIN. QFF PRESSURE IN HPA 1003.8 1004.9 999.1 1003.3 999.9 994.1 990.8 991.7 995.7 1007.1 1004.1 1008.5 990.8 DAY 16 12 7 30 24 28 22 1 1 6 17 3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.8 864.1 864.4 864.8 863.5 858.7 856.0 858.3 864.6 868.4 866.6 867.9 863.6 MAX. QFE PRESSURE IN HPA 871.6 869.5 869.7 868.9 867.8 861.9 857.5 861.1 870.1 871.1 873.0 871.1 873.0 DAY 28 26 18 15 8 17 1 15 24 11 2 21 MIN. QFE PRESSURE IN HPA 855.7 857.9 855.1 860.3 859.1 855.5 854.1 854.9 857.5 865.2 859.9 858.1 854.1 DAY 16 12 12 1 4 28 31 1 1 6 17 4 MEAN QNH PRESSURE IN HPA 1016.6 1014.7 1015.0 1015.5 1014.0 1008.5 1005.4 1008.1 1015.3 1019.5 1017.5 1019.0 1014.1 MAX. QNH PRESSURE IN HPA 1023.2 1020.8 1021.0 1020.1 1018.9 1012.2 1007.2 1011.3 1021.5 1022.6 1024.8 1022.6 1024.8 DAY 28 26 18 15 8 17 1 15 24 11 2 21 MIN. QNH PRESSURE IN HPA 1005.1 1007.6 1004.4 1010.3 1009.0 1004.9 1003.3 1004.2 1007.2 1015.9 1009.9 1007.8 1003.3 DAY 16 12 12 1 4 28 31 1 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 865.6 864.2 864.5 864.8 863.7 858.9 856.1 858.3 864.5 868.1 866.0 867.9 863.5 MAX. QFE PRESSURE IN HPA 871.5 869.5 869.6 868.0 867.6 862.1 857.4 861.4 870.2 870.8 872.7 871.7 872.7 DAY 28 26 18 16 8 17 25 8 23 23 1 21 MIN. QFE PRESSURE IN HPA 856.9 858.5 855.4 859.5 859.7 855.6 854.5 855.2 857.9 864.9 859.3 857.8 854.5 DAY 16 12 12 1 4 28 30 1 1 6 25 3 MEAN QNH PRESSURE IN HPA 1016.3 1014.7 1015.1 1015.5 1014.2 1008.7 1005.6 1008.1 1015.2 1019.2 1016.8 1019.0 1014.0 MAX. QNH PRESSURE IN HPA 1023.1 1020.8 1020.9 1019.1 1018.7 1012.4 1007.0 1011.6 1021.6 1022.3 1024.5 1023.3 1024.5 DAY 28 26 18 16 8 17 25 8 23 23 1 21 MIN. QNH PRESSURE IN HPA 1006.5 1008.3 1004.8 1009.4 1009.7 1005.0 1003.7 1004.5 1007.6 1015.6 1009.2 1007.5 1003.7 DAY 16 12 12 1 4 28 30 1 1 6 25 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 864.4 863.2 863.2 864.1 862.8 858.4 855.8 857.9 863.8 867.2 865.0 867.1 862.7 MAX. QFE PRESSURE IN HPA 869.9 868.0 868.4 867.7 867.0 862.1 857.0 860.8 870.0 869.9 871.2 871.1 871.2 DAY 28 26 18 15 17 17 25 8 24 21 2 21 MIN. QFE PRESSURE IN HPA 856.0 857.1 852.5 859.3 859.8 855.3 854.3 854.9 857.3 864.2 856.5 856.5 852.5 DAY 23 11 11 1 5 28 21 1 1 3 25 3 MEAN QNH PRESSURE IN HPA 1015.0 1013.6 1013.7 1014.6 1013.2 1008.2 1005.2 1007.7 1014.4 1018.2 1015.7 1018.1 1013.1 MAX. QNH PRESSURE IN HPA 1021.3 1019.1 1019.6 1018.8 1018.0 1012.4 1006.6 1010.9 1021.4 1021.3 1022.8 1022.6 1022.8 DAY 28 26 18 15 17 17 25 8 24 21 2 21 MIN. QNH PRESSURE IN HPA 1005.4 1006.7 1001.5 1009.2 1009.8 1004.6 1003.5 1004.2 1006.9 1014.8 1006.0 1006.0 1001.5 DAY 23 11 11 1 5 28 21 1 1 3 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 ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.8 863.3 863.3 863.7 862.6 858.0 855.6 857.9 863.8 867.2 865.2 867.2 862.7 MAX. QFE PRESSURE IN HPA 869.8 867.8 868.5 867.6 867.1 861.3 857.0 860.2 870.1 869.7 871.2 871.8 871.8 DAY 27 25 18 16 17 17 25 8 24 11 2 21 MIN. QFE PRESSURE IN HPA 855.7 856.1 851.3 859.2 859.0 855.1 854.3 854.9 857.4 864.2 856.6 855.9 851.3 DAY 23 11 11 26 5 28 21 1 1 3 25 3 MEAN QNH PRESSURE IN HPA 1015.5 1013.8 1013.8 1014.2 1012.9 1007.7 1005.0 1007.5 1014.3 1018.2 1015.9 1018.2 1013.1 MAX. QNH PRESSURE IN HPA 1021.2 1018.9 1019.7 1018.7 1018.1 1011.5 1006.6 1010.2 1021.5 1021.0 1022.8 1023.4 1023.4 DAY 27 25 18 16 17 17 25 8 24 11 2 21 MIN. QNH PRESSURE IN HPA 1005.1 1005.6 1000.1 1009.1 1008.9 1004.4 1003.5 1004.2 1007.0 1014.8 1006.1 1005.3 1000.1 DAY 23 11 11 26 5 28 21 1 1 3 25 3 MEAN QFF PRESSURE IN HPA 1015.3 1014.5 1011.9 1008.4 1005.0 997.0 992.9 996.0 1004.4 1011.3 1013.3 1020.2 1007.5 MAX. QFF PRESSURE IN HPA 1023.4 1020.6 1017.8 1013.5 1012.5 1001.3 994.7 998.5 1013.3 1016.4 1021.3 1027.9 1027.9 DAY 27 18 18 16 17 18 25 28 24 31 9 6 MIN. QFF PRESSURE IN HPA 1006.1 1005.3 998.3 1002.5 997.5 993.9 991.1 992.7 995.8 1006.9 1004.5 1005.4 991.1 DAY 23 11 11 25 31 27 11 1 5 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 ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 7.7 7.2 10.9 15.0 22.6 27.7 30.9 32.1 26.1 19.9 11.6 4.8 18.0 MINIMUN AIR TEMPERATURE (C) 2.9 2.6 5.6 9.0 16.1 20.0 22.8 23.1 18.3 13.0 6.9 1.4 11.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 4 10 24 27 5 1 0 0 71 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 1 0 1 DAYS WITH FREEZING MIN.<= 0 8 3 1 0 0 0 0 0 0 0 4 8 24 TEMPERATURE RECORDS LOWEST(C) -2.0 -1.4 -0.6 2.6 8.0 15.4 19.0 20.2 12.0 10.0 -4.0 -1.6 -4.0 DAY 23 10 27 6 9 4 6 24 21 6 26 20 MAXIMUM AIR TEMPERATURE (C) 11.6 10.8 14.5 18.4 26.2 31.3 34.8 36.4 30.5 24.2 17.3 9.9 22.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 9 24 30 31 16 1 0 0 111 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 15.6 14.4 19.4 24.0 31.4 35.6 39.2 39.0 37.0 30.2 23.6 13.4 39.2 DAY 14 1 31 30 18 20 21 1 1 2 1 25 DIF. BETWEEN (MAX.-MIN.) (C) 8.7 8.2 8.9 9.4 10.1 11.3 12.0 13.3 12.2 11.2 10.4 8.5 10.4 MEAN DAILY TEMP. (MDT) (C) 7.2 6.7 10.1 13.7 21.1 25.7 28.8 29.7 24.4 18.6 12.1 5.7 17.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 52.4 141.5 241.3 271.1 106.0 11.4 0.0 0.0 823.8 HEATING DEG. DAYS(BASE 18 0C) 333.4 315.5 246.1 129.8 14.6 0.0 0.0 0.0 0.0 18.9 178.4 382.3 1619.1 DEWPOINT (MEAN C) -1.4 0.3 1.1 3.1 6.9 6.5 8.0 5.8 2.7 -3.6 -4.2 -1.8 1.9 MIXING RATIO (G/KG) 4.24 4.64 4.99 5.96 7.55 7.31 8.16 7.07 5.59 3.62 3.61 3.98 5.56 VAPOUR PRESSURE (HPA) 5.87 6.39 6.87 8.19 10.35 9.99 11.08 9.65 7.68 5.01 4.99 5.51 7.63 SATURATION DEF. (HPA) 4.94 4.00 6.50 9.29 17.97 27.94 34.61 39.32 27.45 18.98 9.65 3.28 16.99 RELATIVE HUMIDITY (MEAN %) 56 64 54 49 39 28 26 21 23 23 36 65 40 RELATIVE HUMIDITY (MAX. %) 74 80 70 68 54 41 39 31 34 31 50 80 54 RELATIVE HUMIDITY (MIN. %) 41 49 41 36 30 21 19 15 17 15 23 47 30 RELATIVE HUMIDITY (MEAN% 03UTC) 67 73 67 64 53 40 38 31 34 31 45 70 51 RELATIVE HUMIDITY (MEAN% 09UTC) 47 53 44 44 33 24 21 16 18 17 26 50 33 RELATIVE HUMIDITY (MEAN% 15UTC) 62 70 57 49 36 25 23 20 22 23 38 68 41 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 18.1 95.5 64.8 97.7 31.2 0.2 0.0 0.0 0.0 0.0 7.2 35.9 350.6 DAYS WITH PRECIPITATION >=10 1 4 4 3 0 0 0 0 0 0 0 0 12 DAYS WITH PRECIPITATION >= 5 2 4 4 6 2 0 0 0 0 0 0 3 21 DAYS WITH PRECIPITATION >= 1 3 6 8 10 8 0 0 0 0 0 2 7 44 DAYS WITH PRECIPITATION 7 12 10 11 12 1 0 0 0 0 6 8 67 GREATEST DAILY PRECIPITATION 11.0 48.0 17.0 45.0 7.0 0.2 0.0 0.0 0.0 0.0 4.0 9.0 48.0 DAY 17 5 12 4 2 6 ** ** ** ** 3 12 DAY WITH THUNDER STORM 0 2 3 5 6 0 0 0 1 0 1 0 18 DAYS WITH SNOW OR SLEET 0 2 0 0 0 0 0 0 0 0 0 3 5 DAYS WITH DUST 2 1 1 0 1 2 0 0 4 3 0 0 14 WIND DIRECTION (PREVAILING) 270 135 225 135 45 270 270 270 225 225 135 270 270 PREVAILING WIND SPEED(KNOTS) 4.8 8.7 6.1 9.1 9.0 9.2 9.1 9.3 7.9 8.3 6.8 7.2 8.2 PREVAILING WIND PERCENT 13.5 15.0 23.2 20.7 16.8 31.3 39.4 31.6 24.7 21.3 12.5 8.1 17.2 CALMS PERCENT OF WIND 60.6 40.7 39.4 32.0 24.5 28.0 31.0 29.7 27.3 28.4 41.5 65.3 38.8 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 176 248 1944 VECTOR WIND DIRECTION (MEAN) 199 159 193 172 82 262 256 246 234 235 192 228 224 VECTOR WIND MAGNITUDE(KNOTS) 1.2 2.2 2.2 2.7 0.6 3.4 4.5 3.9 3.8 2.3 1.9 1.0 2.0 WIND STEADINESES (MEAN %) 46.2 52.4 52.4 51.9 10.0 54.0 73.8 61.9 64.4 43.4 46.3 52.6 40.8 WIND SPEED (MEAN KNOTS) 2.6 4.2 4.2 5.2 6.0 6.3 6.1 6.3 5.9 5.3 4.1 1.9 4.9 FASTEST WIND DIRECTION 140 100 100 120 270 170 220 270 140 330 140 240 100 FASTEST WIND SPEED (KNOTS) 19 41 19 31 19 19 17 19 19 29 19 19 41 DAY 16 15 16 3 7 2 22 12 2 1 8 7 DAYS WITH SKY CLEAR (0-2)/8 20 15 15 11 18 25 31 31 29 27 21 17 260 DAYS WITH P.CLOUDY (3-6)/8 6 6 10 9 10 4 0 0 1 4 3 10 63 DAYS WITH CLOUDY (7-8)/8 5 7 6 10 3 1 0 0 0 0 6 4 42 DAYS WITH VISIBILITY =< 2 KM 3 1 0 3 0 0 0 0 0 0 1 4 12 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** 192.8 381.2 369.0 322.0 294.9 241.1 206.7 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 867.7 864.1 864.5 863.3 863.7 860.2 856.3 858.9 862.8 866.1 866.8 867.3 863.5 MAX. QFE PRESSURE IN HPA 871.7 870.3 870.5 868.4 867.4 864.7 861.0 862.7 867.5 871.8 872.6 871.2 872.6 DAY-HOUR 7- 6 1- 6 3- 6 13- 9 3- 9 1- 9 4- 9 25- 3 13- 6 25- 6 15- 6 19-18 MIN. QFE PRESSURE IN HPA 862.5 854.4 858.8 859.0 860.2 856.9 852.5 855.1 858.7 861.5 862.5 860.4 852.5 DAY-HOUR 11-12 5- 3 16-12 23-15 15-15 24-15 20-15 3-15 4-15 12- 3 7-12 12- 0 MEAN QNH PRESSURE IN HPA 1018.7 1014.6 1015.1 1013.8 1014.3 1010.2 1005.8 1008.7 1013.2 1016.9 1017.8 1018.3 1013.9 MAX. QNH PRESSURE IN HPA 1023.3 1021.7 1022.0 1019.6 1018.4 1015.4 1011.1 1013.1 1018.5 1023.4 1024.3 1022.8 1024.3 DAY-HOUR 7- 6 1- 6 3- 6 13- 9 3- 9 1- 9 4- 9 25- 3 13- 6 25- 6 15- 6 19-18 MIN. QNH PRESSURE IN HPA 1012.8 1003.6 1008.6 1008.9 1010.2 1006.5 1001.5 1004.4 1008.5 1011.7 1012.8 1010.5 1001.5 DAY-HOUR 11-12 5- 3 16-12 23-15 15-15 24-15 20-15 3-15 4-15 12- 3 7-12 12- 0 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1019.0 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1025.9 ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** 20- 6 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1010.2 ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** 12- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 867.2 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 870.6 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 20 MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 860.4 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 12 MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1018.2 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1022.1 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 20 MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1010.5 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1018.5 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1024.4 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 20 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1010.2 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 12 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 867.4 863.7 864.0 863.0 863.6 860.1 856.0 858.5 862.5 865.7 866.6 867.1 863.2 MAX. QFE PRESSURE IN HPA 871.0 869.4 869.4 866.4 866.2 864.0 860.5 862.7 866.7 870.9 871.2 870.3 871.2 DAY 6 1 3 1 4 9 4 25 13 25 15 20 MIN. QFE PRESSURE IN HPA 862.5 854.4 858.8 859.7 861.0 857.4 852.6 855.3 859.1 861.5 862.7 860.4 852.6 DAY 12 5 17 24 16 14 17 9 4 12 7 12 MEAN QNH PRESSURE IN HPA 1018.5 1014.2 1014.6 1013.4 1014.1 1010.1 1005.5 1008.3 1012.9 1016.5 1017.6 1018.1 1013.6 MAX. QNH PRESSURE IN HPA 1022.5 1020.7 1020.7 1017.3 1017.1 1014.6 1010.6 1013.1 1017.6 1022.4 1022.8 1021.7 1022.8 DAY 6 1 3 1 4 9 4 25 13 25 15 20 MIN. QNH PRESSURE IN HPA 1012.8 1003.6 1008.6 1009.7 1011.1 1007.0 1001.6 1004.6 1009.0 1011.7 1013.1 1010.5 1001.6 DAY 12 5 17 24 16 14 17 9 4 12 7 12 MEAN QFF PRESSURE IN HPA 1018.7 1014.2 1012.8 1009.1 1005.8 999.1 993.0 995.7 1003.3 1010.4 1015.1 1019.4 1008.1 MAX. QFF PRESSURE IN HPA 1023.7 1021.1 1019.2 1015.4 1011.4 1004.5 998.0 1001.3 1008.0 1017.7 1021.4 1024.9 1024.9 DAY 19 10 3 6 9 9 4 25 22 25 15 20 MIN. QFF PRESSURE IN HPA 1011.1 1001.3 1006.4 1003.7 1001.9 994.3 987.6 991.3 997.5 1003.8 1008.5 1010.2 987.6 DAY 12 5 17 19 24 25 21 15 2 12 7 12 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 868.4 864.6 865.1 863.8 864.2 860.5 856.5 859.1 863.2 866.7 867.5 867.8 864.0 MAX. QFE PRESSURE IN HPA 871.7 870.3 870.5 867.0 866.8 864.5 860.8 862.3 867.5 871.8 872.6 871.2 872.6 DAY 7 1 3 1 3 9 4 25 13 25 15 20 MIN. QFE PRESSURE IN HPA 863.4 856.7 860.1 860.0 861.8 857.6 853.2 855.9 859.3 862.3 863.5 861.5 853.2 DAY 12 5 17 23 6 29 20 9 4 12 7 12 MEAN QNH PRESSURE IN HPA 1019.6 1015.3 1015.8 1014.3 1014.8 1010.6 1006.0 1009.0 1013.6 1017.7 1018.6 1018.9 1014.5 MAX. QNH PRESSURE IN HPA 1023.3 1021.7 1022.0 1018.0 1017.7 1015.1 1010.9 1012.6 1018.5 1023.4 1024.3 1022.8 1024.3 DAY 7 1 3 1 3 9 4 25 13 25 15 20 MIN. QNH PRESSURE IN HPA 1013.9 1006.2 1010.1 1010.0 1012.0 1007.3 1002.2 1005.3 1009.2 1012.6 1014.0 1011.7 1002.2 DAY 12 5 17 23 6 29 20 9 4 12 7 12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1020.1 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1025.9 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 20 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1012.2 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 12 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 868.1 864.7 865.1 863.8 864.3 860.6 856.7 859.3 863.2 866.5 867.2 867.5 863.9 MAX. QFE PRESSURE IN HPA 871.7 870.3 870.3 868.4 867.4 864.7 861.0 862.6 867.3 871.2 872.4 870.9 872.4 DAY 19 1 3 13 3 1 4 12 13 25 15 19 MIN. QFE PRESSURE IN HPA 863.3 857.4 859.6 859.6 861.7 858.0 853.0 856.2 859.7 862.7 863.2 862.1 853.0 DAY 12 23 16 23 6 13 21 3 4 20 7 12 MEAN QNH PRESSURE IN HPA 1019.3 1015.3 1015.8 1014.3 1014.9 1010.7 1006.2 1009.2 1013.7 1017.4 1018.2 1018.5 1014.5 MAX. QNH PRESSURE IN HPA 1023.3 1021.7 1021.7 1019.6 1018.4 1015.4 1011.1 1013.0 1018.3 1022.8 1024.1 1022.4 1024.1 DAY 19 1 3 13 3 1 4 12 13 25 15 19 MIN. QNH PRESSURE IN HPA 1013.8 1007.0 1009.5 1009.5 1011.9 1007.7 1002.0 1005.7 1009.7 1013.1 1013.6 1012.4 1002.0 DAY 12 23 16 23 6 13 21 3 4 20 7 12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1018.7 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1024.6 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 18 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1012.8 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 12 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 867.0 863.6 864.0 863.2 863.5 860.1 856.4 858.8 862.6 865.7 866.3 866.6 863.1 MAX. QFE PRESSURE IN HPA 870.4 869.6 869.1 866.6 866.4 863.9 860.2 861.5 866.4 870.2 871.6 869.9 871.6 DAY 19 1 3 12 3 1 4 12 13 25 15 19 MIN. QFE PRESSURE IN HPA 862.5 858.0 858.8 859.1 860.6 857.5 852.8 855.7 859.2 862.2 862.5 861.0 852.8 DAY 11 23 16 23 15 24 20 3 4 20 7 11 MEAN QNH PRESSURE IN HPA 1018.0 1014.1 1014.6 1013.6 1014.0 1010.1 1005.9 1008.6 1013.0 1016.4 1017.2 1017.5 1013.6 MAX. QNH PRESSURE IN HPA 1021.8 1020.9 1020.4 1017.5 1017.3 1014.4 1010.2 1011.7 1017.3 1021.6 1023.2 1021.3 1023.2 DAY 19 1 3 12 3 1 4 12 13 25 15 19 MIN. QNH PRESSURE IN HPA 1012.8 1007.7 1008.6 1009.0 1010.7 1007.2 1001.8 1005.1 1009.1 1012.5 1012.8 1011.1 1001.8 DAY 11 23 16 23 15 24 20 3 4 20 7 11 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1017.7 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1023.6 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 18 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1011.0 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 11 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 867.5 863.8 864.1 863.0 863.2 859.7 856.2 858.7 862.6 865.8 866.6 866.9 863.2 MAX. QFE PRESSURE IN HPA 870.9 869.8 869.5 866.7 866.4 863.6 859.6 861.8 866.6 870.6 871.4 870.3 871.4 DAY 6 1 3 12 7 9 3 12 13 25 15 19 MIN. QFE PRESSURE IN HPA 862.8 858.4 859.5 859.0 860.2 856.9 852.5 855.1 858.7 862.3 863.0 861.4 852.5 DAY 11 23 16 23 15 24 20 3 4 11 7 11 MEAN QNH PRESSURE IN HPA 1018.5 1014.3 1014.7 1013.4 1013.6 1009.6 1005.7 1008.5 1013.0 1016.6 1017.5 1017.9 1013.6 MAX. QNH PRESSURE IN HPA 1022.4 1021.2 1020.8 1017.6 1017.3 1014.1 1009.5 1012.0 1017.5 1022.1 1023.0 1021.7 1023.0 DAY 6 1 3 12 7 9 3 12 13 25 15 19 MIN. QNH PRESSURE IN HPA 1013.2 1008.2 1009.4 1008.9 1010.2 1006.5 1001.5 1004.4 1008.5 1012.6 1013.4 1011.6 1001.5 DAY 11 23 16 23 15 24 20 3 4 11 7 11 MEAN QFF PRESSURE IN HPA 1018.6 1014.2 1012.7 1009.0 1005.2 998.6 993.2 995.9 1003.5 1010.5 1015.2 1019.1 1008.0 MAX. QFF PRESSURE IN HPA 1023.9 1020.8 1019.2 1014.9 1012.8 1003.6 996.4 999.9 1008.4 1016.9 1021.7 1024.0 1024.0 DAY 19 10 3 6 7 9 4 12 21 25 26 19 MIN. QFF PRESSURE IN HPA 1011.9 1006.6 1006.6 1004.0 1000.6 993.8 987.6 990.9 997.5 1004.4 1008.3 1011.7 987.6 DAY 11 4 16 23 23 24 21 3 1 11 6 11 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 867.5 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 871.2 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 19 MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 861.4 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 11 MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1018.5 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1022.8 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 19 MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1011.6 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 11 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1019.8 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1025.6 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 19 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1011.9 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 11 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 867.6 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 871.0 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 19 MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 861.0 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 11 MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1018.6 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1022.5 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 19 MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1011.1 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 11 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1018.8 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1024.7 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 19 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1010.5 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 11 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.5 7.1 7.7 13.9 22.3 26.6 31.0 30.2 25.5 18.3 12.4 8.8 17.4 MINIMUN AIR TEMPERATURE (C) 1.7 3.8 4.2 9.3 16.7 20.2 25.6 24.2 19.8 13.4 8.7 5.5 12.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 13 31 29 9 2 0 0 85 DAYS WITH MINIMUM TEMP. <=-4 1 0 0 0 0 0 0 0 0 0 0 0 1 DAYS WITH FREEZING MIN.<= 0 10 2 0 0 0 0 0 0 0 0 0 0 12 TEMPERATURE RECORDS LOWEST(C) -5.0 -2.8 0.6 4.8 12.6 13.2 21.6 18.0 14.0 5.6 5.4 1.4 -5.0 DAY 21 6 28 11 13 6 7 24 21 28 29 16 MAXIMUM AIR TEMPERATURE (C) 8.5 11.4 11.7 18.7 27.7 32.1 36.1 35.8 31.1 24.0 17.2 13.2 22.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 5 24 31 31 21 3 0 0 115 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 13.6 19.5 19.4 25.4 32.6 35.4 38.4 38.6 35.8 32.0 23.0 18.6 38.6 DAY 2 8 30 30 31 17 27 13 1 2 5 5 DIF. BETWEEN (MAX.-MIN.) (C) 6.8 7.6 7.5 9.4 11.0 11.9 10.5 11.6 11.3 10.6 8.5 7.7 9.6 MEAN DAILY TEMP. (MDT) (C) 5.1 7.6 7.9 14.0 22.2 26.1 30.8 30.0 25.5 18.7 12.9 9.3 17.5 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 49.2 155.2 304.9 278.9 136.8 17.5 0.0 0.0 942.5 HEATING DEG. DAYS(BASE 18 0C) 400.1 301.5 311.9 123.8 0.5 0.0 0.0 0.0 0.0 32.0 151.9 268.6 1590.2 DEWPOINT (MEAN C) -0.7 0.4 1.7 3.5 4.7 1.9 2.9 4.1 2.2 0.7 -0.1 0.9 1.8 MIXING RATIO (G/KG) 4.38 4.72 5.12 5.86 6.37 5.28 5.71 6.16 5.46 4.82 4.78 4.85 5.29 VAPOUR PRESSURE (HPA) 6.05 6.49 7.03 8.06 8.74 7.23 7.80 8.43 7.50 6.66 6.61 6.71 7.27 SATURATION DEF. (HPA) 2.62 3.88 3.70 8.31 18.99 28.72 38.03 35.43 26.15 15.30 8.13 4.88 16.18 RELATIVE HUMIDITY (MEAN %) 71 65 68 53 34 22 18 20 24 34 48 61 43 RELATIVE HUMIDITY (MAX. %) 86 82 84 70 48 31 27 28 34 47 62 76 56 RELATIVE HUMIDITY (MIN. %) 55 45 49 36 24 14 11 14 15 22 33 42 30 RELATIVE HUMIDITY (MEAN% 03UTC) 73 69 73 61 43 28 24 24 30 41 52 67 49 RELATIVE HUMIDITY (MEAN% 09UTC) 61 53 55 41 28 15 14 16 16 24 36 47 34 RELATIVE HUMIDITY (MEAN% 15UTC) 74 66 66 48 28 16 14 18 22 30 49 63 41 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 149.7 113.7 188.7 126.9 11.5 0.0 4.0 0.0 0.2 0.0 21.9 96.8 713.4 DAYS WITH PRECIPITATION >=10 5 5 6 3 0 0 0 0 0 0 1 3 23 DAYS WITH PRECIPITATION >= 5 10 7 10 6 0 0 0 0 0 0 3 5 41 DAYS WITH PRECIPITATION >= 1 14 12 18 9 5 0 1 0 0 0 3 8 70 DAYS WITH PRECIPITATION 19 15 19 11 8 0 1 0 1 1 5 11 91 GREATEST DAILY PRECIPITATION 33.0 27.6 31.0 55.0 3.8 0.0 4.0 0.0 0.2 0.0 11.2 41.0 55.0 DAY 5 1 1 13 7 ** 17 ** 21 ** 21 10 DAY WITH THUNDER STORM 3 5 5 5 5 1 1 0 0 1 2 3 31 DAYS WITH SNOW OR SLEET 8 0 2 1 0 0 0 0 0 0 0 0 11 DAYS WITH DUST 0 2 1 1 2 1 0 0 0 1 0 1 9 WIND DIRECTION (PREVAILING) 180 135 135 135 270 315 45 270 270 270 45 135 180 PREVAILING WIND SPEED(KNOTS) 8.3 8.8 8.6 12.2 9.4 9.3 10.5 11.4 10.7 7.7 11.2 10.6 9.0 PREVAILING WIND PERCENT 15.7 13.8 16.1 17.1 12.5 14.2 17.3 12.9 17.9 9.7 6.7 12.5 8.6 CALMS PERCENT OF WIND 52.0 49.1 41.9 42.5 46.4 44.6 37.5 48.4 45.4 56.5 61.7 64.1 49.2 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 131 162 171 169 240 289 59 303 299 184 130 149 199 VECTOR WIND MAGNITUDE(KNOTS) 1.9 2.0 2.0 2.8 1.3 2.6 1.3 2.5 3.3 1.7 0.8 2.2 0.7 WIND STEADINESES (MEAN %) 51.4 52.6 42.6 46.7 26.5 48.1 22.4 48.1 60.0 37.8 24.2 73.3 15.2 WIND SPEED (MEAN KNOTS) 3.7 3.8 4.7 6.0 4.9 5.4 5.8 5.2 5.5 4.5 3.3 3.0 4.6 FASTEST WIND DIRECTION 120 130 120 150 200 210 190 270 20 160 160 150 150 FASTEST WIND SPEED (KNOTS) 23 23 29 27 25 23 29 21 29 29 29 31 31 DAY 29 9 7 8 25 1 9 8 7 13 6 29 DAYS WITH SKY CLEAR (0-2)/8 8 10 5 12 15 27 25 30 29 24 17 8 210 DAYS WITH P.CLOUDY (3-6)/8 8 12 12 10 11 3 6 1 1 7 4 13 88 DAYS WITH CLOUDY (7-8)/8 15 7 14 8 5 0 0 0 0 0 9 10 68 DAYS WITH VISIBILITY =< 2 KM 6 3 7 2 0 0 0 0 0 0 1 1 20 DURATION OF SUNSHINE HOURS 133.5 164.5 174.7 247.7 289.6 368.6 347.1 358.6 315.0 287.8 194.8 169.9 3051.8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.5 862.9 861.2 863.3 863.5 859.9 858.7 860.0 862.7 866.0 868.0 868.1 863.2 MAX. QFE PRESSURE IN HPA 870.9 869.0 868.7 867.5 868.7 864.4 864.8 863.6 868.8 869.7 874.5 870.9 874.5 DAY-HOUR 25-18 8- 6 29- 0 30- 9 17- 9 7- 9 3- 9 29- 6 25-18 18- 6 15-21 4- 6 MIN. QFE PRESSURE IN HPA 853.1 856.3 852.5 857.7 858.9 856.6 853.1 855.5 858.0 860.9 863.6 864.4 852.5 DAY-HOUR 12- 3 5- 3 12-15 12-21 28-15 26- 3 6-15 3-15 22- 0 5- 3 6-12 10-12 MEAN QNH PRESSURE IN HPA 1015.1 1013.3 1011.4 1013.8 1014.0 1009.9 1008.5 1010.0 1013.1 1016.8 1019.1 1019.2 1013.7 MAX. QNH PRESSURE IN HPA 1022.4 1020.3 1019.9 1018.5 1019.9 1015.0 1015.5 1014.1 1020.0 1021.0 1026.5 1022.4 1026.5 DAY-HOUR 25-18 8- 6 29- 0 30- 9 17- 9 7- 9 3- 9 29- 6 25-18 18- 6 15-21 4- 6 MIN. QNH PRESSURE IN HPA 1002.1 1005.8 1001.5 1007.4 1008.7 1006.1 1002.1 1004.9 1007.7 1011.0 1014.1 1015.0 1001.5 DAY-HOUR 12- 3 5- 3 12-15 12-21 28-15 26- 3 6-15 3-15 22- 0 5- 3 6-12 10-12 MEAN QFF PRESSURE IN HPA 1015.8 1012.6 1010.2 1009.2 1004.9 998.6 995.0 996.9 1002.4 1009.9 1015.5 1017.5 1007.4 MAX. QFF PRESSURE IN HPA 1024.4 1019.1 1020.0 1014.0 1011.6 1005.8 1002.5 1001.6 1010.3 1016.5 1022.6 1021.9 1024.4 DAY-HOUR 25-18 8- 6 29- 0 25-18 4- 6 7- 9 3- 9 27-18 25- 6 30-21 16- 6 24- 6 MIN. QFF PRESSURE IN HPA 1002.1 1003.2 1000.2 1001.6 997.5 993.8 989.8 990.7 997.5 1002.9 1007.6 1012.2 989.8 DAY-HOUR 12- 3 10-12 7- 9 12-21 28-12 26- 0 7- 0 3-15 15-12 4-12 6-12 14- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 864.4 862.9 860.9 863.0 863.2 859.5 858.3 859.6 862.4 865.8 867.8 867.9 863.0 MAX. QFE PRESSURE IN HPA 870.3 867.5 868.7 865.9 867.9 862.9 863.6 863.0 867.7 868.7 873.2 869.7 873.2 DAY 26 8 29 30 5 8 4 29 26 18 16 28 MIN. QFE PRESSURE IN HPA 854.5 856.6 853.5 857.7 859.7 856.7 853.1 856.0 858.0 861.1 863.7 864.7 853.1 DAY 12 5 13 13 29 25 7 4 22 5 7 14 MEAN QNH PRESSURE IN HPA 1015.0 1013.2 1011.1 1013.4 1013.6 1009.5 1008.0 1009.5 1012.7 1016.6 1018.9 1019.0 1013.4 MAX. QNH PRESSURE IN HPA 1021.7 1018.5 1019.9 1016.7 1019.0 1013.3 1014.1 1013.4 1018.8 1019.9 1025.0 1021.0 1025.0 DAY 26 8 29 30 5 8 4 29 26 18 16 28 MIN. QNH PRESSURE IN HPA 1003.7 1006.1 1002.6 1007.4 1009.7 1006.2 1002.1 1005.4 1007.7 1011.3 1014.2 1015.4 1002.1 DAY 12 5 13 13 29 25 7 4 22 5 7 14 MEAN QFF PRESSURE IN HPA 1015.2 1012.1 1009.7 1008.7 1004.6 998.1 994.6 996.4 1001.8 1009.4 1014.9 1017.0 1006.9 MAX. QFF PRESSURE IN HPA 1022.6 1018.0 1020.0 1013.2 1010.6 1003.2 1000.2 1000.3 1008.5 1015.0 1020.9 1020.3 1022.6 DAY 26 6 29 26 5 7 4 27 26 18 16 18 MIN. QFF PRESSURE IN HPA 1002.6 1006.7 1002.3 1003.3 998.9 993.8 989.8 991.0 997.7 1003.0 1007.8 1012.2 989.8 DAY 12 10 13 13 29 26 7 4 22 5 7 14 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 864.1 862.7 860.9 863.1 863.3 859.6 858.5 859.7 862.5 865.8 867.8 867.9 863.0 MAX. QFE PRESSURE IN HPA 870.0 868.0 868.3 866.7 866.6 862.7 863.6 863.2 868.0 868.9 873.2 869.9 873.2 DAY 26 8 29 30 17 8 4 29 26 18 16 8 MIN. QFE PRESSURE IN HPA 853.1 856.3 854.8 858.0 860.0 856.6 854.1 855.9 858.2 860.9 864.0 865.0 853.1 DAY 12 5 7 13 29 26 7 14 22 5 7 14 MEAN QNH PRESSURE IN HPA 1014.6 1013.1 1011.0 1013.5 1013.8 1009.6 1008.2 1009.7 1012.8 1016.6 1018.8 1019.0 1013.4 MAX. QNH PRESSURE IN HPA 1021.4 1019.1 1019.5 1017.6 1017.5 1013.1 1014.1 1013.6 1019.1 1020.1 1025.0 1021.3 1025.0 DAY 26 8 29 30 17 8 4 29 26 18 16 8 MIN. QNH PRESSURE IN HPA 1002.1 1005.8 1004.1 1007.7 1010.0 1006.1 1003.3 1005.3 1007.9 1011.0 1014.6 1015.7 1002.1 DAY 12 5 7 13 29 26 7 14 22 5 7 14 MEAN QFF PRESSURE IN HPA 1015.8 1012.6 1010.2 1009.3 1005.0 998.6 994.9 996.9 1002.6 1010.2 1015.7 1017.9 1007.5 MAX. QFF PRESSURE IN HPA 1023.6 1018.5 1019.9 1013.9 1008.8 1004.5 1001.0 1001.2 1009.2 1016.0 1021.3 1021.1 1023.6 DAY 26 6 29 27 17 7 3 27 26 31 16 18 MIN. QFF PRESSURE IN HPA 1002.1 1006.6 1002.3 1003.1 999.4 994.1 990.8 991.2 998.8 1003.8 1009.4 1013.5 990.8 DAY 12 10 7 13 28 25 6 14 22 5 6 14 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.1 863.4 861.7 863.8 864.1 860.1 859.1 860.3 863.1 866.5 868.6 868.8 863.7 MAX. QFE PRESSURE IN HPA 870.5 869.0 868.6 867.4 868.4 863.9 864.0 863.6 868.6 869.7 874.1 870.9 874.1 DAY 26 8 29 30 17 7 4 29 25 18 16 4 MIN. QFE PRESSURE IN HPA 853.7 857.6 853.8 859.3 860.8 857.2 854.5 856.6 859.6 861.8 865.3 866.1 853.7 DAY 12 5 7 13 29 23 6 4 22 5 6 10 MEAN QNH PRESSURE IN HPA 1015.8 1013.9 1011.9 1014.4 1014.7 1010.2 1009.0 1010.3 1013.6 1017.5 1019.8 1020.0 1014.2 MAX. QNH PRESSURE IN HPA 1022.0 1020.3 1019.8 1018.4 1019.6 1014.4 1014.6 1014.1 1019.8 1021.0 1026.1 1022.4 1026.1 DAY 26 8 29 30 17 7 4 29 25 18 16 4 MIN. QNH PRESSURE IN HPA 1002.8 1007.3 1002.9 1009.2 1010.9 1006.8 1003.7 1006.1 1009.5 1012.0 1016.0 1016.9 1002.8 DAY 12 5 7 13 29 23 6 4 22 5 6 10 MEAN QFF PRESSURE IN HPA 1017.1 1013.7 1010.9 1009.8 1005.5 998.7 995.5 997.2 1002.9 1010.7 1016.4 1018.8 1008.1 MAX. QFF PRESSURE IN HPA 1024.1 1019.1 1019.6 1013.9 1011.6 1005.1 1001.5 1001.3 1010.3 1016.4 1022.6 1021.9 1024.1 DAY 26 8 29 27 4 7 3 29 25 31 16 24 MIN. QFF PRESSURE IN HPA 1003.1 1008.9 1000.6 1004.2 999.5 995.0 990.2 991.7 999.2 1003.5 1010.2 1015.3 990.2 DAY 12 2 7 12 28 26 6 14 8 5 6 29 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.0 863.4 861.7 863.8 864.1 860.4 859.2 860.4 863.1 866.3 868.3 868.4 863.7 MAX. QFE PRESSURE IN HPA 870.8 867.8 868.2 867.5 868.7 864.4 864.8 863.6 868.4 869.3 873.5 870.7 873.5 DAY 25 8 29 30 17 7 3 29 25 18 16 4 MIN. QFE PRESSURE IN HPA 854.3 858.6 853.0 859.2 860.6 857.0 854.2 856.7 859.4 862.0 864.8 865.5 853.0 DAY 12 10 7 12 28 25 6 14 20 5 6 29 MEAN QNH PRESSURE IN HPA 1015.7 1013.9 1011.9 1014.3 1014.7 1010.4 1009.1 1010.5 1013.5 1017.2 1019.4 1019.5 1014.2 MAX. QNH PRESSURE IN HPA 1022.3 1018.9 1019.3 1018.5 1019.9 1015.0 1015.5 1014.1 1019.6 1020.6 1025.4 1022.2 1025.4 DAY 25 8 29 30 17 7 3 29 25 18 16 4 MIN. QNH PRESSURE IN HPA 1003.5 1008.4 1002.0 1009.1 1010.7 1006.6 1003.4 1006.2 1009.3 1012.3 1015.5 1016.3 1002.0 DAY 12 10 7 12 28 25 6 14 20 5 6 29 MEAN QFF PRESSURE IN HPA 1016.1 1012.7 1010.5 1009.4 1005.3 999.0 995.5 997.2 1002.6 1010.0 1015.3 1017.4 1007.6 MAX. QFF PRESSURE IN HPA 1023.5 1018.1 1018.2 1013.5 1010.3 1005.8 1002.5 1001.1 1009.3 1015.0 1021.3 1020.9 1023.5 DAY 25 6 29 27 17 7 3 27 25 18 16 11 MIN. QFF PRESSURE IN HPA 1004.5 1003.6 1000.2 1002.7 998.9 994.5 990.2 992.1 998.0 1004.0 1009.2 1013.1 990.2 DAY 12 10 7 9 28 25 6 14 15 4 6 5 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 863.8 862.3 860.7 863.2 863.4 859.9 858.6 859.8 862.3 865.4 867.5 867.5 862.9 MAX. QFE PRESSURE IN HPA 870.0 866.2 867.8 866.4 867.5 863.8 864.2 862.8 867.8 868.1 872.9 870.1 872.9 DAY 25 8 29 29 17 7 3 27 25 18 16 4 MIN. QFE PRESSURE IN HPA 853.9 857.4 853.3 859.1 859.4 857.0 853.8 855.9 858.6 861.4 863.6 864.4 853.3 DAY 12 10 7 13 28 25 6 3 21 5 6 10 MEAN QNH PRESSURE IN HPA 1014.4 1012.6 1010.7 1013.6 1013.9 1009.9 1008.4 1009.8 1012.7 1016.2 1018.5 1018.5 1013.3 MAX. QNH PRESSURE IN HPA 1021.4 1017.1 1018.9 1017.3 1018.5 1014.3 1014.8 1013.2 1018.9 1019.2 1024.7 1021.5 1024.7 DAY 25 8 29 29 17 7 3 27 25 18 16 4 MIN. QNH PRESSURE IN HPA 1003.0 1007.0 1002.4 1009.0 1009.3 1006.6 1002.9 1005.3 1008.4 1011.6 1014.1 1015.0 1002.4 DAY 12 10 7 13 28 25 6 3 21 5 6 10 MEAN QFF PRESSURE IN HPA 1014.6 1011.5 1009.3 1008.9 1004.8 998.7 995.0 996.6 1001.8 1009.0 1014.5 1016.5 1006.8 MAX. QFF PRESSURE IN HPA 1022.2 1017.1 1016.9 1013.5 1008.9 1005.3 1001.9 1000.8 1008.8 1013.9 1020.9 1019.8 1022.2 DAY 25 6 29 26 17 7 3 27 25 18 16 24 MIN. QFF PRESSURE IN HPA 1004.4 1003.2 1001.2 1002.0 997.5 994.0 990.1 991.4 997.5 1002.9 1007.6 1013.0 990.1 DAY 12 10 18 9 28 25 6 3 15 4 6 29 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.1 862.5 860.8 863.0 863.0 859.5 858.1 859.6 862.4 865.6 867.8 867.7 862.8 MAX. QFE PRESSURE IN HPA 870.4 867.1 867.3 866.3 867.1 863.3 863.8 862.6 868.0 868.5 872.9 869.9 872.9 DAY 25 19 29 29 17 7 3 27 25 18 15 4 MIN. QFE PRESSURE IN HPA 855.2 857.4 852.5 859.0 858.9 856.9 853.1 855.5 858.3 861.6 864.3 865.2 852.5 DAY 12 10 12 12 28 25 6 3 21 5 6 29 MEAN QNH PRESSURE IN HPA 1014.7 1012.9 1011.0 1013.4 1013.4 1009.5 1007.8 1009.5 1012.7 1016.4 1018.9 1018.8 1013.2 MAX. QNH PRESSURE IN HPA 1021.8 1018.1 1018.3 1017.2 1018.1 1013.8 1014.3 1013.0 1019.1 1019.7 1024.7 1021.3 1024.7 DAY 25 19 29 29 17 7 3 27 25 18 15 4 MIN. QNH PRESSURE IN HPA 1004.5 1007.0 1001.5 1008.9 1008.7 1006.5 1002.1 1004.9 1008.1 1011.8 1014.9 1015.9 1001.5 DAY 12 10 12 12 28 25 6 3 21 5 6 29 MEAN QFF PRESSURE IN HPA 1015.7 1012.3 1010.0 1009.0 1004.6 998.5 994.6 996.7 1002.5 1010.1 1015.8 1017.6 1007.3 MAX. QFF PRESSURE IN HPA 1023.9 1017.8 1018.5 1013.9 1008.9 1004.8 1001.7 1001.3 1010.1 1015.0 1021.4 1020.5 1023.9 DAY 25 6 28 15 17 7 3 27 25 18 16 11 MIN. QFF PRESSURE IN HPA 1006.3 1003.9 1000.7 1002.7 997.9 994.0 989.9 990.7 998.3 1004.2 1009.1 1013.7 989.9 DAY 12 10 12 9 28 25 6 3 15 4 6 29 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 864.7 863.1 861.5 863.6 863.6 860.1 858.8 860.4 863.2 866.4 868.3 868.3 863.5 MAX. QFE PRESSURE IN HPA 870.9 867.7 868.3 866.9 867.7 863.3 864.7 863.4 868.8 869.0 873.9 870.3 873.9 DAY 25 19 29 29 17 7 3 27 25 18 15 4 MIN. QFE PRESSURE IN HPA 856.8 857.9 852.7 858.6 859.7 857.4 854.2 856.5 858.5 862.0 864.5 864.9 852.7 DAY 12 10 12 12 28 25 6 3 21 5 6 13 MEAN QNH PRESSURE IN HPA 1015.4 1013.6 1011.7 1014.0 1014.0 1010.1 1008.7 1010.5 1013.6 1017.2 1019.5 1019.4 1014.0 MAX. QNH PRESSURE IN HPA 1022.4 1018.8 1019.5 1017.9 1018.8 1013.8 1015.4 1013.9 1020.0 1020.3 1025.8 1021.7 1025.8 DAY 25 19 29 29 17 7 3 27 25 18 15 4 MIN. QNH PRESSURE IN HPA 1006.4 1007.6 1001.7 1008.4 1009.7 1007.0 1003.4 1006.0 1008.3 1012.3 1015.1 1015.6 1001.7 DAY 12 10 12 12 28 25 6 3 21 5 6 13 MEAN QFF PRESSURE IN HPA 1016.6 1013.3 1010.5 1009.4 1004.8 998.7 995.2 997.4 1003.0 1010.5 1016.1 1018.2 1007.8 MAX. QFF PRESSURE IN HPA 1024.4 1018.2 1019.4 1014.0 1008.7 1003.6 1001.9 1001.6 1009.9 1015.5 1021.7 1021.5 1024.4 DAY 25 7 28 25 17 7 3 27 25 30 15 24 MIN. QFF PRESSURE IN HPA 1006.7 1008.1 1001.4 1002.3 998.1 994.3 990.5 992.0 998.8 1003.8 1008.7 1014.0 990.5 DAY 11 9 12 12 28 17 6 3 15 4 6 13 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 864.7 863.2 861.6 863.6 863.7 860.2 858.9 860.3 863.0 866.2 868.2 868.2 863.5 MAX. QFE PRESSURE IN HPA 870.9 867.8 868.5 866.7 868.1 863.4 864.5 863.4 868.2 869.0 874.5 870.6 874.5 DAY 25 19 28 29 17 7 3 28 25 17 15 7 MIN. QFE PRESSURE IN HPA 856.2 856.9 853.1 857.7 860.3 857.2 853.8 856.8 858.1 861.8 864.3 865.0 853.1 DAY 11 4 12 12 28 25 6 3 21 4 6 13 MEAN QNH PRESSURE IN HPA 1015.3 1013.6 1011.8 1014.1 1014.2 1010.2 1008.8 1010.3 1013.4 1017.1 1019.4 1019.3 1013.9 MAX. QNH PRESSURE IN HPA 1022.4 1018.9 1019.7 1017.6 1019.2 1013.9 1015.1 1013.9 1019.3 1020.3 1026.5 1022.1 1026.5 DAY 25 19 28 29 17 7 3 28 25 17 15 7 MIN. QNH PRESSURE IN HPA 1005.7 1006.5 1002.1 1007.4 1010.3 1006.8 1002.9 1006.4 1007.8 1012.0 1014.9 1015.7 1002.1 DAY 11 4 12 12 28 25 6 3 21 4 6 13 MEAN QFF PRESSURE IN HPA 1015.7 1012.4 1010.3 1009.1 1004.8 998.7 995.1 997.0 1002.5 1009.9 1015.3 1017.1 1007.3 MAX. QFF PRESSURE IN HPA 1023.2 1017.7 1019.9 1014.0 1009.1 1003.8 1001.1 1000.8 1009.0 1016.5 1022.1 1020.8 1023.2 DAY 25 7 28 15 17 7 3 27 25 30 15 17 MIN. QFF PRESSURE IN HPA 1004.4 1005.8 1001.4 1001.6 998.9 994.7 990.2 992.5 997.9 1003.6 1008.3 1012.8 990.2 DAY 11 10 12 12 28 25 6 3 21 4 6 13 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.4 3.0 5.7 13.3 21.1 26.5 28.9 28.4 24.4 18.9 10.9 6.1 16.0 MINIMUN AIR TEMPERATURE (C) 2.0 -1.3 1.7 8.5 15.8 20.7 22.5 22.0 18.6 14.4 7.1 2.7 11.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 16 26 22 2 0 0 0 68 DAYS WITH MINIMUM TEMP. <=-4 2 7 1 0 0 0 0 0 0 0 0 0 10 DAYS WITH FREEZING MIN.<= 0 5 19 6 2 0 0 0 0 0 0 0 2 34 TEMPERATURE RECORDS LOWEST(C) -5.4 -10.0 -7.6 -3.0 7.4 13.8 18.6 19.0 13.4 9.4 3.4 -2.0 -10.0 DAY 29 6 8 11 5 3 7 20 30 24 28 27 MAXIMUM AIR TEMPERATURE (C) 9.8 8.2 10.3 17.8 26.1 31.9 34.9 35.1 30.3 24.2 15.3 10.5 21.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 4 24 31 31 22 0 0 0 112 DAYS WITH MAXIMUM TEMP. <= 0 0 1 0 0 0 0 0 0 0 0 0 0 1 TEMPERATURE RECORDS HIGHEST(C) 15.6 16.2 16.2 27.4 32.5 36.4 37.6 37.6 33.6 29.4 19.8 16.4 37.6 DAY 12 21 3 27 27 28 27 25 1 16 2 8 DIF. BETWEEN (MAX.-MIN.) (C) 7.8 9.5 8.6 9.3 10.3 11.2 12.4 13.1 11.7 9.8 8.2 7.8 10.0 MEAN DAILY TEMP. (MDT) (C) 5.9 3.4 6.0 13.2 20.9 26.3 28.7 28.5 24.5 19.3 11.2 6.6 16.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 1.2 41.3 159.3 238.1 233.4 106.8 20.0 0.0 0.0 800.2 HEATING DEG. DAYS(BASE 18 0C) 374.5 408.0 371.8 156.7 15.8 0.0 0.0 0.0 0.0 31.5 203.7 354.4 1916.4 DEWPOINT (MEAN C) -2.3 -6.3 -1.3 1.8 2.3 1.3 2.5 3.2 3.2 4.9 4.5 0.8 1.2 MIXING RATIO (G/KG) 3.88 2.91 4.26 5.38 5.36 5.06 5.48 5.74 5.73 6.46 6.26 4.82 5.11 VAPOUR PRESSURE (HPA) 5.35 4.02 5.84 7.37 7.36 6.94 7.48 7.85 7.88 8.90 8.62 6.66 7.02 SATURATION DEF. (HPA) 3.95 3.92 3.65 8.87 18.59 28.79 33.58 32.05 23.57 13.66 4.66 2.93 14.85 RELATIVE HUMIDITY (MEAN %) 61 54 64 49 31 21 20 21 27 43 66 71 44 RELATIVE HUMIDITY (MAX. %) 77 72 82 69 44 31 28 32 36 57 81 86 58 RELATIVE HUMIDITY (MIN. %) 40 34 46 33 20 12 12 12 18 30 50 52 30 RELATIVE HUMIDITY (MEAN% 03UTC) 65 62 73 58 40 28 26 27 33 49 71 77 51 RELATIVE HUMIDITY (MEAN% 09UTC) 46 39 51 37 23 15 14 14 20 33 53 56 33 RELATIVE HUMIDITY (MEAN% 15UTC) 65 54 60 43 23 16 14 16 22 42 68 75 42 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 134.3 18.1 162.8 149.1 12.2 0.0 0.0 0.0 0.0 11.9 86.0 93.1 667.5 DAYS WITH PRECIPITATION >=10 4 0 7 5 0 0 0 0 0 0 3 4 23 DAYS WITH PRECIPITATION >= 5 5 1 9 6 1 0 0 0 0 1 5 4 32 DAYS WITH PRECIPITATION >= 1 6 6 12 9 2 0 0 0 0 3 9 7 54 DAYS WITH PRECIPITATION 8 7 16 11 6 3 0 0 0 10 13 12 86 GREATEST DAILY PRECIPITATION 52.0 6.0 33.0 48.0 8.1 0.0 0.0 0.0 0.0 5.0 32.0 24.0 52.0 DAY 15 24 28 5 19 ** ** ** ** 19 30 14 DAY WITH THUNDER STORM 2 0 5 6 4 2 0 0 0 3 6 1 29 DAYS WITH SNOW OR SLEET 3 4 5 3 0 0 0 0 0 0 0 0 15 DAYS WITH DUST 0 2 3 1 1 0 0 2 1 0 0 0 10 WIND DIRECTION (PREVAILING) 180 180 180 270 225 270 270 270 270 270 180 180 270 PREVAILING WIND SPEED(KNOTS) 8.4 9.2 10.3 6.9 9.5 8.6 8.9 9.7 9.7 6.1 9.0 7.3 8.2 PREVAILING WIND PERCENT 10.1 13.4 13.7 13.8 11.7 15.0 17.7 20.6 15.0 11.3 9.6 12.5 10.8 CALMS PERCENT OF WIND 63.7 51.8 49.2 42.1 40.3 44.6 44.0 41.9 38.8 55.6 61.7 60.1 49.5 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 151 179 184 223 182 260 278 269 278 251 158 167 221 VECTOR WIND MAGNITUDE(KNOTS) 1.3 1.7 2.6 1.8 0.9 1.5 2.4 2.9 2.1 0.9 1.8 1.4 1.2 WIND STEADINESES (MEAN %) 46.4 47.2 61.9 40.0 19.1 34.9 54.5 60.4 40.4 28.1 62.1 48.3 30.0 WIND SPEED (MEAN KNOTS) 2.8 3.6 4.2 4.5 4.7 4.3 4.4 4.8 5.2 3.2 2.9 2.9 4.0 FASTEST WIND DIRECTION 160 150 150 140 250 260 270 290 360 200 120 140 150 FASTEST WIND SPEED (KNOTS) 21 29 29 27 29 19 17 19 27 23 19 25 29 DAY 10 21 7 4 3 6 2 1 6 2 4 9 DAYS WITH SKY CLEAR (0-2)/8 16 18 7 4 17 23 30 30 29 16 12 9 211 DAYS WITH P.CLOUDY (3-6)/8 7 6 11 17 11 5 1 1 1 11 10 14 95 DAYS WITH CLOUDY (7-8)/8 8 4 13 9 3 2 0 0 0 4 8 8 59 DAYS WITH VISIBILITY =< 2 KM 6 1 4 0 0 0 0 0 0 0 0 1 12 DURATION OF SUNSHINE HOURS 201.4 214.2 194.9 249.3 300.0 322.5 386.9 368.4 324.5 233.6 177.5 171.4 3144.6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.1 863.4 859.5 861.1 861.6 859.7 856.5 858.9 863.8 867.0 865.9 865.5 862.2 MAX. QFE PRESSURE IN HPA 869.8 869.4 868.6 867.3 865.3 865.4 860.2 863.0 868.2 871.9 871.0 870.3 871.9 DAY-HOUR 11- 9 7- 9 1- 9 13- 6 6- 9 8- 9 26- 6 31-18 30- 6 8-18 8- 3 30- 6 MIN. QFE PRESSURE IN HPA 851.7 857.5 848.9 854.0 855.0 853.2 853.3 855.3 860.0 863.6 860.0 856.8 848.9 DAY-HOUR 16- 0 21-15 29- 6 4-21 21-15 30- 0 12- 0 5- 6 2-15 6- 3 30-15 9-12 MEAN QNH PRESSURE IN HPA 1014.6 1013.8 1009.4 1011.3 1011.8 1009.7 1006.0 1008.7 1014.3 1017.9 1016.7 1016.2 1012.5 MAX. QNH PRESSURE IN HPA 1021.2 1020.7 1019.8 1018.3 1016.0 1016.1 1010.2 1013.4 1019.3 1023.6 1022.5 1021.7 1023.6 DAY-HOUR 11- 9 7- 9 1- 9 13- 6 6- 9 8- 9 26- 6 31-18 30- 6 8-18 8- 3 30- 6 MIN. QNH PRESSURE IN HPA 1000.5 1007.2 997.4 1003.2 1004.3 1002.2 1002.4 1004.6 1010.0 1014.1 1010.0 1006.4 997.4 DAY-HOUR 16- 0 21-15 29- 6 4-21 21-15 30- 0 12- 0 5- 6 2-15 6- 3 30-15 9-12 MEAN QFF PRESSURE IN HPA 1014.8 1015.7 1009.4 1007.0 1003.4 998.5 993.5 996.5 1004.2 1010.7 1013.6 1016.1 1006.9 MAX. QFF PRESSURE IN HPA 1021.1 1025.5 1020.8 1018.3 1011.8 1006.1 998.1 1002.3 1011.9 1015.6 1018.8 1022.8 1025.5 DAY-HOUR 6- 6 7- 9 8- 6 13- 6 6- 9 8- 3 25-15 31-18 30- 6 8-18 29- 6 30- 6 MIN. QFF PRESSURE IN HPA 999.9 1005.0 996.3 997.4 994.3 989.6 989.8 991.8 998.2 1004.7 1008.5 1004.4 989.6 DAY-HOUR 16- 0 21-12 29- 6 4-18 31- 0 29- 3 12- 6 1- 0 2-21 6- 3 11- 3 9-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 864.1 863.1 859.3 860.7 861.4 859.3 856.0 858.3 863.4 866.6 865.8 865.3 861.9 MAX. QFE PRESSURE IN HPA 869.3 866.9 867.0 865.7 864.0 864.0 860.0 861.1 867.6 870.2 870.7 869.9 870.7 DAY 7 17 1 13 7 8 26 11 30 9 8 30 MIN. QFE PRESSURE IN HPA 851.7 859.2 852.0 855.8 856.9 853.2 853.3 855.5 860.0 864.1 863.3 857.7 851.7 DAY 16 26 29 5 31 30 12 1 3 2 11 10 MEAN QNH PRESSURE IN HPA 1014.7 1013.5 1009.2 1010.7 1011.5 1009.2 1005.4 1008.1 1013.8 1017.5 1016.6 1016.0 1012.2 MAX. QNH PRESSURE IN HPA 1020.6 1017.9 1018.0 1016.5 1014.6 1014.6 1010.0 1011.3 1018.7 1021.6 1022.2 1021.3 1022.2 DAY 7 17 1 13 7 8 26 11 30 9 8 30 MIN. QNH PRESSURE IN HPA 1000.5 1009.1 1000.9 1005.2 1006.5 1002.2 1002.4 1004.9 1010.0 1014.7 1013.8 1007.4 1000.5 DAY 16 26 29 5 31 30 12 1 3 2 11 10 MEAN QFF PRESSURE IN HPA 1014.4 1014.9 1009.0 1006.4 1003.2 998.1 993.0 995.8 1003.5 1010.0 1013.3 1015.5 1006.4 MAX. QFF PRESSURE IN HPA 1019.6 1023.0 1019.2 1017.3 1010.6 1005.2 997.8 999.7 1011.1 1014.6 1017.5 1022.2 1023.0 DAY 6 7 1 12 6 8 26 31 30 29 8 30 MIN. QFF PRESSURE IN HPA 999.9 1007.0 999.5 998.6 994.3 989.8 990.2 991.8 998.5 1004.9 1009.2 1005.9 989.8 DAY 16 22 29 28 31 29 12 1 3 6 11 10 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 863.9 863.0 859.2 861.0 861.5 859.5 856.1 858.5 863.5 866.8 865.7 865.2 862.0 MAX. QFE PRESSURE IN HPA 869.1 866.9 867.0 866.1 863.9 864.5 860.0 861.3 867.6 870.2 871.0 869.6 871.0 DAY 7 16 11 13 7 8 26 11 30 9 8 30 MIN. QFE PRESSURE IN HPA 852.7 859.2 850.4 854.9 857.7 853.3 853.5 855.5 860.4 863.6 862.4 857.7 850.4 DAY 16 26 29 5 4 29 12 5 12 6 11 10 MEAN QNH PRESSURE IN HPA 1014.4 1013.4 1009.1 1011.1 1011.7 1009.5 1005.5 1008.3 1014.0 1017.7 1016.5 1015.9 1012.3 MAX. QNH PRESSURE IN HPA 1020.4 1017.9 1018.0 1016.9 1014.4 1015.1 1010.0 1011.5 1018.7 1021.6 1022.5 1020.9 1022.5 DAY 7 16 11 13 7 8 26 11 30 9 8 30 MIN. QNH PRESSURE IN HPA 1001.7 1009.1 999.1 1004.2 1007.4 1002.4 1002.6 1004.9 1010.5 1014.1 1012.7 1007.4 999.1 DAY 16 26 29 5 4 29 12 5 12 6 11 10 MEAN QFF PRESSURE IN HPA 1015.1 1015.7 1009.4 1007.3 1003.6 998.7 993.5 996.6 1004.3 1011.0 1013.9 1016.2 1007.1 MAX. QFF PRESSURE IN HPA 1020.0 1023.1 1019.1 1017.9 1010.1 1006.1 997.9 1000.8 1011.7 1014.6 1018.7 1021.9 1023.1 DAY 7 6 1 13 6 8 26 31 30 25 8 30 MIN. QFF PRESSURE IN HPA 1000.8 1008.3 998.1 1000.2 996.4 989.6 990.6 993.0 999.4 1004.7 1008.5 1006.7 989.6 DAY 16 22 29 5 31 29 31 1 2 6 11 10 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.6 863.9 860.1 861.7 862.3 860.1 856.5 859.1 864.3 867.7 866.5 866.1 862.7 MAX. QFE PRESSURE IN HPA 869.7 868.6 867.9 867.3 864.8 865.1 860.2 862.4 868.2 871.1 871.0 870.3 871.1 DAY 6 7 1 13 7 8 26 31 30 9 8 30 MIN. QFE PRESSURE IN HPA 854.8 859.0 848.9 856.2 858.7 854.2 853.8 855.3 860.9 864.3 862.4 858.6 848.9 DAY 16 26 29 5 4 29 12 5 12 2 11 9 MEAN QNH PRESSURE IN HPA 1015.3 1014.4 1010.1 1011.9 1012.6 1010.1 1006.0 1008.9 1014.9 1018.8 1017.4 1017.0 1013.1 MAX. QNH PRESSURE IN HPA 1021.0 1019.8 1019.0 1018.3 1015.5 1015.8 1010.2 1012.7 1019.3 1022.6 1022.5 1021.7 1022.6 DAY 6 7 1 13 7 8 26 31 30 9 8 30 MIN. QNH PRESSURE IN HPA 1004.1 1008.9 997.4 1005.7 1008.5 1003.4 1002.9 1004.6 1011.0 1014.9 1012.7 1008.4 997.4 DAY 16 26 29 5 4 29 12 5 12 2 11 9 MEAN QFF PRESSURE IN HPA 1015.9 1016.7 1010.3 1007.6 1004.1 998.7 993.3 996.5 1004.8 1011.6 1014.5 1017.1 1007.6 MAX. QFF PRESSURE IN HPA 1021.1 1025.5 1020.8 1018.3 1011.5 1005.5 997.7 1001.7 1011.9 1015.2 1018.8 1022.8 1025.5 DAY 6 7 8 13 6 8 26 31 30 25 29 30 MIN. QFF PRESSURE IN HPA 1003.2 1008.9 996.3 1001.2 997.6 990.6 989.8 992.3 999.1 1005.9 1008.6 1006.4 989.8 DAY 16 21 29 5 31 29 12 5 2 2 11 9 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 864.5 864.0 860.0 861.7 862.3 860.3 856.7 859.2 864.2 867.3 866.1 865.6 862.7 MAX. QFE PRESSURE IN HPA 869.8 869.4 868.6 867.1 865.3 865.4 859.8 862.7 867.8 871.0 870.7 869.7 871.0 DAY 11 7 1 13 6 8 25 31 30 8 8 30 MIN. QFE PRESSURE IN HPA 855.5 859.5 849.3 856.9 857.9 854.4 853.8 855.6 860.8 864.6 863.2 857.4 849.3 DAY 16 21 29 4 4 29 11 5 2 6 11 9 MEAN QNH PRESSURE IN HPA 1015.2 1014.6 1010.0 1012.0 1012.6 1010.3 1006.3 1009.0 1014.8 1018.4 1017.0 1016.4 1013.0 MAX. QNH PRESSURE IN HPA 1021.2 1020.7 1019.8 1018.1 1016.0 1016.1 1009.8 1013.1 1018.9 1022.5 1022.2 1021.0 1022.5 DAY 11 7 1 13 6 8 25 31 30 8 8 30 MIN. QNH PRESSURE IN HPA 1004.9 1009.4 997.8 1006.5 1007.6 1003.6 1002.9 1005.0 1010.9 1015.2 1013.6 1007.0 997.8 DAY 16 21 29 4 4 29 11 5 2 6 11 9 MEAN QFF PRESSURE IN HPA 1015.0 1016.1 1009.6 1007.5 1004.1 998.9 993.6 996.5 1004.4 1010.7 1013.5 1015.8 1007.1 MAX. QFF PRESSURE IN HPA 1020.2 1025.5 1020.4 1017.7 1011.8 1005.9 997.8 1001.8 1011.2 1014.3 1017.2 1021.5 1025.5 DAY 5 7 8 12 6 8 25 31 30 25 7 27 MIN. QFF PRESSURE IN HPA 1003.8 1006.9 997.0 1000.8 998.8 990.6 990.1 992.5 998.9 1005.9 1009.2 1004.4 990.1 DAY 16 21 29 27 30 29 12 1 2 2 11 9 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 863.3 862.8 859.0 860.9 861.3 859.7 856.4 858.8 863.5 866.6 865.3 864.9 861.9 MAX. QFE PRESSURE IN HPA 868.6 867.5 867.5 866.8 864.1 864.5 859.5 862.5 867.0 870.7 869.5 868.6 870.7 DAY 11 7 1 13 6 8 25 31 30 9 8 30 MIN. QFE PRESSURE IN HPA 854.4 857.8 851.0 855.3 856.8 853.7 853.7 855.3 860.2 864.3 860.9 856.8 851.0 DAY 16 21 29 4 4 29 12 5 12 23 30 9 MEAN QNH PRESSURE IN HPA 1013.8 1013.2 1008.9 1011.0 1011.5 1009.7 1005.9 1008.7 1014.0 1017.5 1016.1 1015.6 1012.2 MAX. QNH PRESSURE IN HPA 1019.8 1018.5 1018.5 1017.7 1014.7 1015.1 1009.4 1012.8 1018.0 1022.2 1020.8 1019.8 1022.2 DAY 11 7 1 13 6 8 25 31 30 9 8 30 MIN. QNH PRESSURE IN HPA 1003.6 1007.5 999.7 1004.6 1006.4 1002.8 1002.8 1004.6 1010.2 1014.9 1011.0 1006.4 999.7 DAY 16 21 29 4 4 29 12 5 12 23 30 9 MEAN QFF PRESSURE IN HPA 1013.6 1014.5 1008.6 1006.6 1003.1 998.6 993.5 996.5 1003.7 1010.0 1012.8 1015.1 1006.4 MAX. QFF PRESSURE IN HPA 1019.0 1023.9 1018.5 1017.1 1010.2 1005.1 997.7 1002.0 1010.4 1013.6 1016.5 1020.3 1023.9 DAY 5 6 1 12 6 8 25 31 30 9 8 27 MIN. QFF PRESSURE IN HPA 1002.2 1005.0 1000.5 998.6 996.9 990.4 990.2 993.1 998.5 1005.6 1009.5 1004.4 990.2 DAY 16 21 29 4 30 29 12 5 2 15 11 9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 863.7 863.0 859.0 860.6 860.6 859.4 856.3 858.9 863.4 866.7 865.6 865.3 861.9 MAX. QFE PRESSURE IN HPA 868.8 866.7 866.8 866.2 863.6 864.3 859.4 862.3 866.9 871.1 870.0 868.6 871.1 DAY 12 7 1 13 6 8 25 31 29 8 7 29 MIN. QFE PRESSURE IN HPA 854.1 857.5 851.7 854.4 855.0 853.4 853.5 855.3 860.0 864.1 860.0 857.5 851.7 DAY 15 21 29 4 21 29 12 5 2 6 30 9 MEAN QNH PRESSURE IN HPA 1014.2 1013.4 1008.8 1010.7 1010.6 1009.3 1005.8 1008.7 1013.8 1017.6 1016.3 1016.0 1012.1 MAX. QNH PRESSURE IN HPA 1020.0 1017.6 1017.7 1017.1 1014.1 1014.9 1009.3 1012.6 1017.9 1022.6 1021.4 1019.8 1022.6 DAY 12 7 1 13 6 8 25 31 29 8 7 29 MIN. QNH PRESSURE IN HPA 1003.3 1007.2 1000.5 1003.6 1004.3 1002.5 1002.6 1004.6 1010.0 1014.7 1010.0 1007.2 1000.5 DAY 15 21 29 4 21 29 12 5 2 6 30 9 MEAN QFF PRESSURE IN HPA 1014.9 1015.7 1009.0 1006.7 1002.6 998.5 993.7 997.0 1004.1 1010.8 1013.8 1016.2 1006.9 MAX. QFF PRESSURE IN HPA 1020.7 1024.3 1018.7 1017.1 1009.6 1005.3 998.1 1002.0 1010.4 1015.6 1017.5 1021.1 1024.3 DAY 5 6 8 12 6 2 25 31 29 8 7 27 MIN. QFF PRESSURE IN HPA 1001.4 1005.5 1000.5 998.0 994.9 990.3 990.4 993.4 998.7 1006.1 1008.8 1006.2 990.3 DAY 15 21 24 4 21 29 12 5 2 15 30 9 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 864.2 863.7 859.9 861.3 861.7 859.9 857.0 859.5 864.1 867.2 866.0 865.9 862.5 MAX. QFE PRESSURE IN HPA 869.2 867.5 867.4 866.7 864.6 864.7 860.1 863.0 867.2 871.9 870.5 869.3 871.9 DAY 5 16 1 13 6 8 25 31 23 8 7 29 MIN. QFE PRESSURE IN HPA 853.8 859.6 853.2 854.5 856.6 854.0 854.6 856.0 860.4 864.7 860.3 858.0 853.2 DAY 15 21 28 4 21 29 16 5 2 23 30 9 MEAN QNH PRESSURE IN HPA 1014.8 1014.2 1009.9 1011.4 1011.9 1009.9 1006.6 1009.5 1014.7 1018.2 1016.8 1016.7 1012.9 MAX. QNH PRESSURE IN HPA 1020.5 1018.5 1018.4 1017.6 1015.2 1015.4 1010.1 1013.4 1018.2 1023.6 1022.0 1020.6 1023.6 DAY 5 16 1 13 6 8 25 31 23 8 7 29 MIN. QNH PRESSURE IN HPA 1002.9 1009.5 1002.2 1003.7 1006.1 1003.2 1003.8 1005.4 1010.5 1015.4 1010.3 1007.7 1002.2 DAY 15 21 28 4 21 29 16 5 2 23 30 9 MEAN QFF PRESSURE IN HPA 1015.4 1016.4 1010.0 1007.0 1003.3 998.5 993.9 997.1 1004.6 1011.0 1014.0 1016.8 1007.3 MAX. QFF PRESSURE IN HPA 1020.8 1024.6 1019.5 1017.8 1009.9 1005.2 997.8 1002.3 1010.1 1015.6 1017.2 1021.5 1024.6 DAY 5 6 8 12 6 7 25 31 30 8 6 29 MIN. QFF PRESSURE IN HPA 1000.8 1008.1 1001.5 997.4 995.9 990.7 990.8 992.9 998.7 1007.0 1009.1 1006.5 990.7 DAY 15 21 24 4 21 29 12 5 2 1 30 9 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 864.2 863.8 859.9 861.3 861.9 859.8 856.8 859.1 863.9 867.1 865.9 865.7 862.5 MAX. QFE PRESSURE IN HPA 869.5 867.5 867.0 866.7 865.0 864.7 859.7 862.9 867.6 871.2 870.7 869.9 871.2 DAY 5 16 10 13 6 7 25 31 29 8 7 29 MIN. QFE PRESSURE IN HPA 853.7 860.0 853.7 854.0 857.9 853.9 854.1 855.8 860.1 864.6 861.4 858.0 853.7 DAY 15 21 28 4 21 29 11 5 2 1 30 9 MEAN QNH PRESSURE IN HPA 1014.8 1014.3 1009.9 1011.5 1012.1 1009.7 1006.4 1009.0 1014.5 1018.1 1016.7 1016.5 1012.8 MAX. QNH PRESSURE IN HPA 1020.8 1018.5 1018.0 1017.6 1015.7 1015.4 1009.7 1013.3 1018.7 1022.8 1022.2 1021.3 1022.8 DAY 5 16 10 13 6 7 25 31 29 8 7 29 MIN. QNH PRESSURE IN HPA 1002.8 1010.0 1002.8 1003.2 1007.6 1003.0 1003.3 1005.2 1010.1 1015.2 1011.6 1007.7 1002.8 DAY 15 21 28 4 21 29 11 5 2 1 30 9 MEAN QFF PRESSURE IN HPA 1014.7 1015.7 1009.4 1006.9 1003.5 998.3 993.7 996.5 1004.1 1010.4 1013.3 1015.9 1006.9 MAX. QFF PRESSURE IN HPA 1020.2 1024.3 1018.5 1018.2 1010.4 1005.8 997.4 1001.9 1010.7 1014.3 1017.4 1021.6 1024.3 DAY 5 6 10 11 5 7 6 31 29 28 7 29 MIN. QFF PRESSURE IN HPA 1001.4 1007.5 1000.1 997.4 996.4 990.7 990.4 992.5 998.2 1005.9 1010.2 1005.8 990.4 DAY 15 21 24 4 30 29 11 5 2 5 10 9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1998 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 2.1 4.9 8.1 15.6 21.0 28.5 30.1 31.5 25.7 19.7 14.9 11.5 17.8 MINIMUN AIR TEMPERATURE (C) -1.1 1.2 3.4 10.5 15.4 22.3 23.8 25.6 19.7 14.1 10.0 7.6 12.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 22 28 30 10 0 0 0 91 DAYS WITH MINIMUM TEMP. <=-4 4 3 0 0 0 0 0 0 0 0 0 0 7 DAYS WITH FREEZING MIN.<= 0 20 10 2 0 0 0 0 0 0 0 0 0 32 TEMPERATURE RECORDS LOWEST(C) -9.4 -7.4 -0.8 5.0 9.6 16.0 18.8 20.2 15.6 7.6 7.4 3.0 -9.4 DAY 14 16 21 5 1 1 9 23 27 31 2 23 MAXIMUM AIR TEMPERATURE (C) 6.6 9.5 12.8 20.8 26.6 34.3 35.9 37.1 31.7 26.1 20.8 16.8 23.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 7 29 31 31 22 2 0 0 122 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 11.4 16.2 19.0 27.8 33.0 37.4 38.6 39.6 37.4 30.2 24.0 24.0 39.6 DAY 17 6 16 16 9 30 15 19 1 6 15 10 DIF. BETWEEN (MAX.-MIN.) (C) 7.7 8.3 9.4 10.3 11.2 12.0 12.1 11.5 12.0 12.0 10.8 9.2 10.6 MEAN DAILY TEMP. (MDT) (C) 2.7 5.4 8.1 15.6 21.0 28.3 29.8 31.4 25.7 20.1 15.4 12.2 18.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.2 42.5 217.8 273.7 321.5 141.0 17.0 0.0 0.0 1013.8 HEATING DEG. DAYS(BASE 18 0C) 473.5 353.5 305.9 89.2 9.3 0.0 0.0 0.0 0.0 6.4 76.9 179.8 1494.4 DEWPOINT (MEAN C) -2.5 -2.1 0.7 2.7 2.9 3.5 4.0 2.4 2.4 -1.7 -1.3 -4.0 0.6 MIXING RATIO (G/KG) 3.81 3.99 4.94 5.55 5.62 5.85 6.10 5.57 5.41 4.07 4.21 3.58 4.89 VAPOUR PRESSURE (HPA) 5.25 5.50 6.79 7.63 7.72 8.02 8.32 7.63 7.44 5.62 5.83 4.96 6.73 SATURATION DEF. (HPA) 2.05 3.50 4.38 10.92 18.29 32.09 35.48 39.53 26.74 18.17 11.56 9.02 17.64 RELATIVE HUMIDITY (MEAN %) 73 65 64 46 33 22 20 17 24 26 36 38 39 RELATIVE HUMIDITY (MAX. %) 88 80 83 65 48 30 29 24 34 36 47 53 51 RELATIVE HUMIDITY (MIN. %) 55 46 46 28 20 14 13 11 15 15 22 24 26 RELATIVE HUMIDITY (MEAN% 03UTC) 78 68 69 54 43 27 27 22 30 30 41 43 44 RELATIVE HUMIDITY (MEAN% 09UTC) 64 51 51 30 24 16 15 12 16 17 22 28 29 RELATIVE HUMIDITY (MEAN% 15UTC) 75 66 62 39 26 17 15 13 19 24 38 40 36 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 178.4 65.5 214.9 43.3 20.2 2.0 0.0 0.0 0.0 1.2 37.0 1.5 564.0 DAYS WITH PRECIPITATION >=10 6 2 5 2 0 0 0 0 0 0 2 0 17 DAYS WITH PRECIPITATION >= 5 8 3 8 2 2 0 0 0 0 0 2 0 25 DAYS WITH PRECIPITATION >= 1 16 8 11 6 4 2 0 0 0 1 2 1 51 DAYS WITH PRECIPITATION 19 13 13 9 4 2 0 0 0 1 3 1 65 GREATEST DAILY PRECIPITATION 49.3 28.0 59.0 17.0 9.2 1.0 0.0 0.0 0.0 1.2 24.0 1.5 59.0 DAY 12 15 29 20 12 16 ** ** ** 10 11 31 DAY WITH THUNDER STORM 5 1 4 0 3 2 0 0 0 2 2 0 19 DAYS WITH SNOW OR SLEET 9 5 1 0 0 0 0 0 0 0 0 0 15 DAYS WITH DUST 1 0 0 0 0 0 0 0 1 0 0 0 2 WIND DIRECTION (PREVAILING) 180 180 180 180 270 315 270 270 270 90 180 180 270 PREVAILING WIND SPEED(KNOTS) 7.7 9.9 10.6 10.3 10.0 9.4 11.3 8.5 9.5 7.8 9.2 9.5 9.1 PREVAILING WIND PERCENT 20.2 12.9 18.1 14.2 16.1 11.7 18.1 13.3 14.6 19.0 10.4 14.9 9.9 CALMS PERCENT OF WIND 54.0 58.0 56.0 57.1 53.6 47.5 43.5 39.1 54.6 45.2 61.3 55.2 52.0 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 164 152 191 210 251 323 273 318 290 128 188 175 216 VECTOR WIND MAGNITUDE(KNOTS) 2.3 1.5 2.4 2.1 1.8 0.9 1.7 1.5 2.2 0.5 1.4 2.1 1.0 WIND STEADINESES (MEAN %) 65.7 41.7 60.0 52.5 40.9 18.4 31.5 28.8 53.7 11.4 45.2 61.8 23.8 WIND SPEED (MEAN KNOTS) 3.5 3.6 4.0 4.0 4.4 4.9 5.4 5.2 4.1 4.4 3.1 3.4 4.2 FASTEST WIND DIRECTION 170 80 160 210 290 10 300 10 10 160 120 170 10 FASTEST WIND SPEED (KNOTS) 25 31 35 23 25 39 29 19 29 29 39 23 39 DAY 18 23 16 20 29 17 20 2 8 13 11 23 DAYS WITH SKY CLEAR (0-2)/8 8 11 11 13 17 26 28 26 27 26 19 12 224 DAYS WITH P.CLOUDY (3-6)/8 10 8 8 11 12 4 3 5 3 5 8 13 90 DAYS WITH CLOUDY (7-8)/8 13 9 12 6 2 0 0 0 0 0 3 6 51 DAYS WITH VISIBILITY =< 2 KM 9 5 5 0 0 0 0 0 0 0 0 0 19 DURATION OF SUNSHINE HOURS 161.4 166.6 193.5 277.2 331.8 365.1 371.3 352.0 314.5 300.2 229.1 185.3 3248.0 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 863.5 864.1 863.3 863.4 863.0 860.6 857.2 859.9 862.3 865.6 867.5 867.9 863.2 MAX. QFE PRESSURE IN HPA 870.5 871.8 869.4 871.8 869.1 865.9 861.4 863.6 866.7 870.2 872.3 873.7 873.7 DAY-HOUR 22- 6 5- 6 21-18 12- 6 8- 6 5- 9 23- 6 29- 6 26- 6 25- 6 21- 6 9- 6 MIN. QFE PRESSURE IN HPA 853.2 855.8 852.1 856.9 858.1 854.5 853.5 856.4 858.6 861.9 862.6 862.6 852.1 DAY-HOUR 12-12 15-12 1-12 23- 0 30- 0 30-21 1- 0 4-15 16- 0 1-15 10-18 23-18 MEAN QNH PRESSURE IN HPA 1013.9 1014.7 1013.8 1013.9 1013.4 1010.7 1006.8 1009.9 1012.6 1016.4 1018.5 1019.0 1013.6 MAX. QNH PRESSURE IN HPA 1022.0 1023.4 1020.7 1023.4 1020.4 1016.7 1011.6 1014.1 1017.6 1021.6 1024.0 1025.6 1025.6 DAY-HOUR 22- 6 5- 6 21-18 12- 6 8- 6 5- 9 23- 6 29- 6 26- 6 25- 6 21- 6 9- 6 MIN. QNH PRESSURE IN HPA 1002.2 1005.2 1001.0 1006.5 1007.8 1003.7 1002.6 1005.9 1008.4 1012.2 1013.0 1013.0 1001.0 DAY-HOUR 12-12 15-12 1-12 23- 0 30- 0 30-21 1- 0 4-15 16- 0 1-15 10-18 23-18 MEAN QFF PRESSURE IN HPA 1016.1 1015.2 1012.4 1008.4 1005.0 998.5 993.7 996.2 1001.8 1008.8 1013.6 1016.0 1007.1 MAX. QFF PRESSURE IN HPA 1026.3 1022.8 1021.9 1016.8 1012.3 1005.3 997.8 999.7 1008.8 1015.5 1019.4 1022.8 1026.3 DAY-HOUR 14-18 2- 6 21-18 1- 6 16-12 5- 9 23- 3 26- 3 26- 3 25- 3 27- 6 5- 6 MIN. QFF PRESSURE IN HPA 1004.8 1004.9 1000.6 1000.1 997.3 989.9 989.5 992.3 996.2 1003.0 1006.5 1009.4 989.5 DAY-HOUR 12-12 7-12 1-12 17-15 28-21 30-15 1- 0 12-12 2- 0 2- 0 10-21 24- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 863.3 864.0 863.0 863.1 862.5 860.4 856.8 859.6 861.9 865.3 867.3 867.8 862.9 MAX. QFE PRESSURE IN HPA 869.3 870.5 868.6 871.0 867.9 864.8 860.5 862.4 866.0 869.0 871.3 872.5 872.5 DAY 22 5 22 12 8 6 24 29 26 29 21 9 MIN. QFE PRESSURE IN HPA 854.1 857.6 855.6 856.9 858.1 854.9 853.5 857.2 858.6 862.0 863.5 863.0 853.5 DAY 13 15 2 23 30 30 1 5 16 1 11 24 MEAN QNH PRESSURE IN HPA 1013.7 1014.6 1013.5 1013.5 1012.9 1010.4 1006.4 1009.5 1012.2 1016.0 1018.4 1018.9 1013.3 MAX. QNH PRESSURE IN HPA 1020.6 1022.0 1019.8 1022.5 1019.0 1015.5 1010.6 1012.7 1016.8 1020.3 1022.9 1024.2 1024.2 DAY 22 5 22 12 8 6 24 29 26 29 21 9 MIN. QNH PRESSURE IN HPA 1003.3 1007.3 1005.0 1006.5 1007.8 1004.2 1002.6 1006.8 1008.4 1012.3 1014.0 1013.4 1002.6 DAY 13 15 2 23 30 30 1 5 16 1 11 24 MEAN QFF PRESSURE IN HPA 1015.5 1015.0 1012.1 1008.0 1004.6 998.3 993.3 995.8 1001.2 1008.1 1013.1 1015.4 1006.7 MAX. QFF PRESSURE IN HPA 1022.6 1020.4 1019.9 1016.0 1008.9 1003.9 996.7 999.3 1008.1 1013.5 1016.8 1021.0 1022.6 DAY 22 2 22 2 3 6 23 26 26 29 27 7 MIN. QFF PRESSURE IN HPA 1004.8 1005.6 1002.2 1001.7 997.9 990.8 989.5 992.6 996.2 1003.0 1008.8 1009.4 989.5 DAY 12 8 18 17 29 30 1 13 2 2 11 24 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 863.1 863.9 863.0 863.1 862.7 860.5 856.9 859.8 862.0 865.4 867.3 867.7 863.0 MAX. QFE PRESSURE IN HPA 869.3 870.5 868.3 870.8 868.4 864.1 860.6 862.9 866.2 869.3 871.3 872.7 872.7 DAY 22 5 22 12 8 7 23 29 26 25 21 9 MIN. QFE PRESSURE IN HPA 854.4 856.5 855.4 857.6 858.3 855.0 853.7 857.6 858.9 862.1 864.4 862.8 853.7 DAY 13 15 1 23 30 30 1 5 4 1 11 24 MEAN QNH PRESSURE IN HPA 1013.5 1014.5 1013.4 1013.5 1013.1 1010.5 1006.5 1009.8 1012.3 1016.1 1018.4 1018.8 1013.4 MAX. QNH PRESSURE IN HPA 1020.6 1022.0 1019.5 1022.3 1019.6 1014.7 1010.7 1013.3 1017.1 1020.6 1022.9 1024.5 1024.5 DAY 22 5 22 12 8 7 23 29 26 25 21 9 MIN. QNH PRESSURE IN HPA 1003.6 1006.0 1004.8 1007.3 1008.1 1004.3 1002.8 1007.3 1008.7 1012.4 1015.0 1013.2 1002.8 DAY 13 15 1 23 30 30 1 5 4 1 11 24 MEAN QFF PRESSURE IN HPA 1016.0 1015.4 1012.4 1008.4 1005.0 998.6 993.7 996.5 1001.9 1009.2 1014.2 1016.4 1007.3 MAX. QFF PRESSURE IN HPA 1023.6 1021.2 1019.8 1016.1 1009.9 1003.2 997.8 999.7 1008.8 1015.5 1017.8 1022.2 1023.6 DAY 22 2 22 2 3 1 23 26 26 25 21 7 MIN. QFF PRESSURE IN HPA 1006.1 1006.0 1002.1 1000.8 998.5 990.5 989.6 993.5 996.7 1003.6 1009.7 1010.2 989.6 DAY 12 8 17 17 29 30 1 14 1 1 11 24 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.0 864.8 863.7 863.9 863.5 861.1 857.4 860.4 862.8 866.2 868.3 868.8 863.7 MAX. QFE PRESSURE IN HPA 870.5 871.8 869.2 871.8 869.1 865.4 861.4 863.6 866.7 870.2 872.3 873.7 873.7 DAY 22 5 22 12 8 5 23 29 26 25 21 9 MIN. QFE PRESSURE IN HPA 855.4 856.5 853.6 858.1 858.8 855.2 854.0 858.1 859.6 863.0 864.9 863.7 853.6 DAY 12 15 1 23 30 30 2 4 4 3 11 24 MEAN QNH PRESSURE IN HPA 1014.6 1015.4 1014.2 1014.5 1014.0 1011.3 1007.1 1010.4 1013.2 1017.1 1019.4 1020.0 1014.3 MAX. QNH PRESSURE IN HPA 1022.0 1023.4 1020.5 1023.4 1020.4 1016.1 1011.6 1014.1 1017.6 1021.6 1024.0 1025.6 1025.6 DAY 22 5 22 12 8 5 23 29 26 25 21 9 MIN. QNH PRESSURE IN HPA 1004.8 1006.0 1002.7 1007.8 1008.6 1004.5 1003.2 1007.8 1009.5 1013.4 1015.6 1014.2 1002.7 DAY 12 15 1 23 30 30 2 4 4 3 11 24 MEAN QFF PRESSURE IN HPA 1017.2 1016.3 1013.0 1009.1 1005.5 998.9 993.9 996.7 1002.3 1009.6 1014.7 1017.3 1007.9 MAX. QFF PRESSURE IN HPA 1024.6 1022.8 1020.6 1016.8 1010.5 1004.5 997.6 999.7 1008.6 1015.4 1019.4 1022.8 1024.6 DAY 22 2 22 1 3 5 22 29 26 26 27 5 MIN. QFF PRESSURE IN HPA 1006.9 1007.1 1001.9 1003.0 999.0 991.4 989.8 993.6 996.9 1004.3 1010.2 1010.5 989.8 DAY 12 8 18 17 29 30 2 13 1 2 11 24 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 863.8 864.5 863.6 863.8 863.6 861.2 857.6 860.2 862.7 865.9 867.8 868.3 863.6 MAX. QFE PRESSURE IN HPA 869.8 871.2 869.3 871.8 869.1 865.9 861.2 863.5 866.1 869.7 872.0 872.5 872.5 DAY 22 5 22 12 8 5 23 29 26 25 21 9 MIN. QFE PRESSURE IN HPA 855.4 856.5 853.2 858.3 858.5 855.2 854.1 857.8 859.7 863.0 864.4 863.5 853.2 DAY 12 15 1 21 30 30 2 4 4 3 10 21 MEAN QNH PRESSURE IN HPA 1014.3 1015.1 1014.1 1014.4 1014.1 1011.4 1007.2 1010.2 1013.1 1016.8 1018.9 1019.4 1014.1 MAX. QNH PRESSURE IN HPA 1021.2 1022.8 1020.6 1023.4 1020.4 1016.7 1011.4 1014.0 1016.9 1021.0 1023.7 1024.2 1024.2 DAY 22 5 22 12 8 5 23 29 26 25 21 9 MIN. QNH PRESSURE IN HPA 1004.8 1006.0 1002.2 1008.1 1008.3 1004.5 1003.3 1007.5 1009.7 1013.4 1015.0 1014.0 1002.2 DAY 12 15 1 21 30 30 2 4 4 3 10 21 MEAN QFF PRESSURE IN HPA 1016.1 1015.4 1012.4 1008.6 1005.6 999.0 993.9 996.3 1002.0 1008.8 1013.5 1015.8 1007.3 MAX. QFF PRESSURE IN HPA 1022.8 1021.4 1019.8 1016.1 1011.5 1005.3 997.5 999.6 1007.5 1014.4 1017.0 1021.8 1022.8 DAY 22 2 21 1 16 5 23 25 26 25 27 5 MIN. QFF PRESSURE IN HPA 1006.7 1006.6 1001.5 1001.7 998.8 991.3 990.2 993.1 997.0 1004.2 1008.8 1010.2 990.2 DAY 29 7 1 20 29 30 2 13 1 2 11 24 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 863.0 863.5 862.7 863.1 862.9 860.5 857.0 859.6 861.9 865.1 866.8 867.3 862.8 MAX. QFE PRESSURE IN HPA 868.1 869.9 868.5 871.1 867.5 865.3 860.4 862.7 865.2 868.8 871.0 871.6 871.6 DAY 22 5 22 12 8 5 22 29 25 25 21 9 MIN. QFE PRESSURE IN HPA 853.2 855.8 852.1 858.2 858.2 854.8 853.9 856.9 859.0 862.1 863.0 863.0 852.1 DAY 12 15 1 21 30 30 2 4 15 1 10 21 MEAN QNH PRESSURE IN HPA 1013.4 1014.0 1013.0 1013.6 1013.3 1010.6 1006.6 1009.5 1012.2 1015.9 1017.8 1018.3 1013.2 MAX. QNH PRESSURE IN HPA 1019.2 1021.3 1019.7 1022.6 1018.5 1016.0 1010.5 1013.1 1015.9 1020.0 1022.5 1023.2 1023.2 DAY 22 5 22 12 8 5 22 29 25 25 21 9 MIN. QNH PRESSURE IN HPA 1002.2 1005.2 1001.0 1007.9 1007.9 1004.1 1003.0 1006.5 1008.9 1012.4 1013.4 1013.4 1001.0 DAY 12 15 1 21 30 30 2 4 15 1 10 21 MEAN QFF PRESSURE IN HPA 1015.2 1014.3 1011.6 1008.0 1005.0 998.5 993.7 995.8 1001.3 1008.0 1012.4 1014.8 1006.5 MAX. QFF PRESSURE IN HPA 1023.0 1020.2 1018.8 1015.6 1012.3 1005.0 996.8 999.6 1007.0 1013.6 1016.2 1020.9 1023.0 DAY 14 2 22 2 16 5 22 25 25 25 21 6 MIN. QFF PRESSURE IN HPA 1004.8 1004.9 1000.6 1000.4 998.9 990.4 990.3 992.3 996.4 1003.2 1007.5 1009.8 990.3 DAY 12 7 1 20 29 30 3 12 1 1 10 17 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 863.2 863.7 862.9 863.1 862.4 860.2 856.7 859.3 861.9 865.3 867.1 867.6 862.8 MAX. QFE PRESSURE IN HPA 868.2 870.2 868.7 870.6 867.1 864.8 859.9 862.5 865.1 869.1 871.2 871.8 871.8 DAY 21 5 28 12 8 5 22 29 26 25 21 9 MIN. QFE PRESSURE IN HPA 854.2 856.0 853.3 858.1 858.2 854.6 853.5 856.4 859.2 861.9 862.7 863.2 853.3 DAY 12 15 1 21 30 30 2 4 15 1 10 23 MEAN QNH PRESSURE IN HPA 1013.7 1014.3 1013.3 1013.5 1012.8 1010.2 1006.3 1009.3 1012.1 1016.0 1018.0 1018.6 1013.2 MAX. QNH PRESSURE IN HPA 1019.3 1021.6 1019.9 1022.1 1018.1 1015.5 1009.9 1012.8 1015.8 1020.4 1022.8 1023.4 1023.4 DAY 21 5 28 12 8 5 22 29 26 25 21 9 MIN. QNH PRESSURE IN HPA 1003.4 1005.4 1002.4 1007.8 1007.9 1003.8 1002.6 1005.9 1009.1 1012.2 1013.1 1013.6 1002.4 DAY 12 15 1 21 30 30 2 4 15 1 10 23 MEAN QFF PRESSURE IN HPA 1016.2 1015.0 1012.3 1008.2 1004.7 998.2 993.5 996.0 1001.8 1009.1 1013.8 1016.2 1007.1 MAX. QFF PRESSURE IN HPA 1024.4 1021.0 1019.5 1015.5 1009.8 1003.8 996.6 999.0 1007.4 1015.4 1017.6 1022.5 1024.4 DAY 14 2 21 2 3 5 23 29 25 25 21 6 MIN. QFF PRESSURE IN HPA 1007.2 1005.5 1002.1 1000.1 999.1 989.9 990.0 992.3 997.1 1003.4 1007.9 1011.8 989.9 DAY 12 7 17 17 29 30 2 12 1 1 10 21 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 863.9 864.3 863.9 863.8 863.2 860.8 857.6 860.2 862.7 865.9 867.7 868.1 863.5 MAX. QFE PRESSURE IN HPA 869.5 870.8 869.4 870.9 868.1 865.1 860.8 863.2 866.1 869.2 871.5 872.5 872.5 DAY 21 5 21 12 8 5 22 29 26 25 20 8 MIN. QFE PRESSURE IN HPA 854.7 857.5 855.1 858.8 859.3 855.0 854.4 857.3 859.9 862.7 862.6 862.6 854.4 DAY 12 15 1 21 30 30 2 4 15 1 10 23 MEAN QNH PRESSURE IN HPA 1014.4 1014.9 1014.4 1014.3 1013.6 1010.9 1007.3 1010.3 1013.1 1016.7 1018.8 1019.2 1014.0 MAX. QNH PRESSURE IN HPA 1020.8 1022.3 1020.7 1022.4 1019.2 1015.8 1010.9 1013.6 1016.9 1020.5 1023.1 1024.2 1024.2 DAY 21 5 21 12 8 5 22 29 26 25 20 8 MIN. QNH PRESSURE IN HPA 1004.0 1007.2 1004.4 1008.6 1009.2 1004.3 1003.6 1006.9 1009.9 1013.1 1013.0 1013.0 1003.6 DAY 12 15 1 21 30 30 2 4 15 1 10 23 MEAN QFF PRESSURE IN HPA 1016.9 1015.7 1013.1 1008.8 1005.1 998.5 994.0 996.6 1002.2 1009.3 1014.0 1016.5 1007.6 MAX. QFF PRESSURE IN HPA 1026.3 1021.8 1021.9 1015.9 1010.0 1004.0 997.1 999.4 1007.6 1014.3 1017.5 1022.2 1026.3 DAY 14 2 21 2 2 5 31 29 26 25 20 6 MIN. QFF PRESSURE IN HPA 1008.4 1005.3 1003.4 1003.1 997.4 991.2 990.0 993.1 997.5 1003.7 1006.7 1010.2 990.0 DAY 12 7 17 18 28 30 2 12 1 1 10 23 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 863.7 864.3 863.8 863.6 863.0 860.7 857.6 860.1 862.5 865.7 867.7 868.0 863.4 MAX. QFE PRESSURE IN HPA 869.5 870.5 869.1 871.2 868.1 865.1 860.7 862.7 866.1 869.4 871.3 872.8 872.8 DAY 21 4 21 11 7 5 22 28 26 28 20 8 MIN. QFE PRESSURE IN HPA 854.0 857.6 855.6 858.4 858.8 854.5 854.4 857.5 859.4 862.4 862.7 863.0 854.0 DAY 12 15 1 22 29 30 12 4 15 2 10 23 MEAN QNH PRESSURE IN HPA 1014.2 1014.8 1014.4 1014.1 1013.4 1010.8 1007.2 1010.1 1012.8 1016.5 1018.7 1019.1 1013.8 MAX. QNH PRESSURE IN HPA 1020.8 1022.0 1020.4 1022.8 1019.2 1015.8 1010.8 1013.1 1016.9 1020.7 1022.9 1024.6 1024.6 DAY 21 4 21 11 7 5 22 28 26 28 20 8 MIN. QNH PRESSURE IN HPA 1003.2 1007.3 1005.0 1008.2 1008.6 1003.7 1003.6 1007.2 1009.3 1012.7 1013.1 1013.4 1003.2 DAY 12 15 1 22 29 30 12 4 15 2 10 23 MEAN QFF PRESSURE IN HPA 1016.0 1015.0 1012.7 1008.2 1004.8 998.4 993.8 996.1 1001.7 1008.5 1013.2 1015.5 1007.0 MAX. QFF PRESSURE IN HPA 1025.0 1020.8 1020.6 1016.2 1009.8 1003.9 996.8 998.5 1007.4 1013.9 1017.0 1021.2 1025.0 DAY 14 2 21 1 2 5 22 25 25 28 12 6 MIN. QFF PRESSURE IN HPA 1007.7 1005.3 1003.0 1002.2 997.3 990.2 989.8 992.8 996.8 1003.5 1006.5 1009.5 989.8 DAY 12 7 17 18 28 30 12 12 1 1 10 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 1999 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 6.0 7.4 9.9 15.5 23.2 27.5 29.7 31.5 25.0 20.6 11.1 8.9 18.0 MINIMUN AIR TEMPERATURE (C) 2.4 3.0 5.6 10.2 17.0 20.8 23.9 25.7 18.6 15.7 7.0 4.7 12.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 5 15 28 31 6 0 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 4 2 0 0 0 0 0 0 0 0 1 1 8 TEMPERATURE RECORDS LOWEST(C) -1.4 -2.0 0.4 3.8 10.6 17.0 19.4 22.4 14.5 11.0 -1.6 -0.2 -2.0 DAY 23 21 17 10 2 14 16 1 25 23 29 3 MAXIMUM AIR TEMPERATURE (C) 10.6 12.6 14.6 21.0 29.1 33.3 35.4 37.1 31.3 26.1 16.5 14.6 23.5 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 12 28 31 31 20 4 0 0 126 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 15.6 17.4 23.0 26.8 36.6 37.4 39.0 39.4 36.2 32.2 21.6 23.0 39.4 DAY 31 1 31 27 31 20 20 27 3 2 7 31 DIF. BETWEEN (MAX.-MIN.) (C) 8.2 9.6 9.0 10.8 12.1 12.5 11.5 11.4 12.7 10.4 9.5 9.9 10.6 MEAN DAILY TEMP. (MDT) (C) 6.5 7.8 10.1 15.6 23.0 27.1 29.6 31.4 25.0 20.9 11.7 9.7 18.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.3 78.0 181.9 267.1 320.9 119.1 42.5 0.0 0.0 1009.9 HEATING DEG. DAYS(BASE 18 0C) 356.8 285.1 244.2 85.6 0.0 0.0 0.0 0.0 0.0 7.3 188.5 258.5 1426.1 DEWPOINT (MEAN C) -1.1 -1.1 -1.1 -0.2 -0.3 0.6 4.1 4.1 0.8 0.9 -0.9 -3.2 0.2 MIXING RATIO (G/KG) 4.29 4.27 4.28 4.55 4.48 4.76 6.19 6.06 4.86 4.85 4.43 3.76 4.73 VAPOUR PRESSURE (HPA) 5.91 5.89 5.88 6.26 6.16 6.52 8.43 8.29 6.68 6.70 6.12 5.21 6.50 SATURATION DEF. (HPA) 3.61 4.71 6.69 12.05 23.63 31.28 34.14 38.73 26.14 18.40 7.58 6.61 17.80 RELATIVE HUMIDITY (MEAN %) 65 59 50 38 23 19 21 19 22 30 47 49 37 RELATIVE HUMIDITY (MAX. %) 81 77 69 56 35 29 30 25 32 41 65 65 50 RELATIVE HUMIDITY (MIN. %) 46 37 33 23 13 11 14 13 13 19 29 32 24 RELATIVE HUMIDITY (MEAN% 03UTC) 70 66 60 48 30 26 27 22 27 37 55 53 43 RELATIVE HUMIDITY (MEAN% 09UTC) 52 44 36 27 15 12 15 14 14 20 32 35 26 RELATIVE HUMIDITY (MEAN% 15UTC) 68 60 44 30 18 14 17 16 19 28 46 50 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 172.0 84.0 23.4 19.7 0.8 0.0 2.8 0.6 0.0 1.4 55.0 33.0 392.7 DAYS WITH PRECIPITATION >=10 5 2 0 0 0 0 0 0 0 0 1 1 9 DAYS WITH PRECIPITATION >= 5 6 4 2 2 0 0 0 0 0 0 1 4 19 DAYS WITH PRECIPITATION >= 1 12 7 6 6 0 0 1 0 0 1 3 6 42 DAYS WITH PRECIPITATION 12 7 9 8 2 0 2 1 0 4 3 7 55 GREATEST DAILY PRECIPITATION 78.0 32.0 6.3 8.0 0.4 0.0 2.0 0.6 0.0 1.1 51.0 11.0 78.0 DAY 9 20 1 1 7 ** 14 4 ** 27 8 2 DAY WITH THUNDER STORM 1 1 3 4 1 0 2 1 0 0 2 0 15 DAYS WITH SNOW OR SLEET 3 0 0 0 0 0 0 0 0 0 0 1 4 DAYS WITH DUST 0 0 0 0 0 2 5 0 1 0 0 0 8 WIND DIRECTION (PREVAILING) 180 180 180 270 270 270 270 315 315 270 225 180 270 PREVAILING WIND SPEED(KNOTS) 8.3 10.0 10.1 10.5 11.2 11.1 11.7 9.9 10.5 11.3 7.5 9.2 10.3 PREVAILING WIND PERCENT 10.5 17.9 15.7 12.5 16.5 18.8 17.3 14.5 16.7 9.3 6.7 7.7 12.0 CALMS PERCENT OF WIND 63.3 50.0 42.7 44.6 45.2 48.8 38.7 48.8 51.7 61.3 72.9 71.0 53.3 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 171 205 197 238 280 287 310 320 303 258 233 171 264 VECTOR WIND MAGNITUDE(KNOTS) 1.0 2.5 2.4 1.3 1.5 3.4 2.6 2.3 3.2 1.7 0.7 1.1 1.3 WIND STEADINESES (MEAN %) 29.4 55.6 40.7 22.8 27.3 63.0 37.1 47.9 69.6 47.2 31.8 50.0 28.3 WIND SPEED (MEAN KNOTS) 3.4 4.5 5.9 5.7 5.5 5.4 7.0 4.8 4.6 3.6 2.2 2.2 4.6 FASTEST WIND DIRECTION 60 160 150 40 240 350 340 300 290 190 140 180 150 FASTEST WIND SPEED (KNOTS) 29 23 33 29 31 23 29 23 19 23 19 19 33 DAY 2 18 20 9 13 16 9 27 5 10 8 13 DAYS WITH SKY CLEAR (0-2)/8 15 18 15 16 26 29 28 23 30 19 14 13 246 DAYS WITH P.CLOUDY (3-6)/8 8 4 7 9 3 0 2 8 0 10 11 9 71 DAYS WITH CLOUDY (7-8)/8 8 6 9 5 2 1 1 0 0 2 5 9 48 DAYS WITH VISIBILITY =< 2 KM 6 1 1 1 3 1 4 0 0 0 0 1 18 DURATION OF SUNSHINE HOURS 184.9 218.3 216.2 264.9 333.4 371.9 335.0 315.5 322.0 250.1 227.4 180.2 3219.8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.3 864.2 861.8 863.2 862.1 859.4 856.4 859.2 861.9 865.6 866.2 868.2 862.7 MAX. QFE PRESSURE IN HPA 869.6 868.8 867.8 867.2 868.6 864.0 860.8 864.4 867.3 868.5 871.6 871.4 871.6 DAY-HOUR 2- 6 12-21 31- 3 10-21 28- 6 6- 9 9- 6 19- 6 30-18 11- 9 16- 6 28-18 MIN. QFE PRESSURE IN HPA 854.4 853.4 852.0 855.6 857.6 853.4 851.1 854.4 859.0 861.2 860.8 863.5 851.1 DAY-HOUR 9- 3 5-15 2- 3 8- 3 20- 3 24-15 13-15 14-15 11- 0 31- 0 11-12 13-12 MEAN QNH PRESSURE IN HPA 1014.9 1014.8 1012.1 1013.7 1012.3 1009.4 1005.8 1009.1 1012.1 1016.3 1017.1 1019.3 1013.1 MAX. QNH PRESSURE IN HPA 1020.9 1020.0 1018.9 1018.2 1019.8 1014.6 1010.9 1015.0 1018.3 1019.7 1023.2 1023.0 1023.2 DAY-HOUR 2- 6 12-21 31- 3 10-21 28- 6 6- 9 9- 6 19- 6 30-18 11- 9 16- 6 28-18 MIN. QNH PRESSURE IN HPA 1003.6 1002.5 1000.9 1005.0 1007.3 1002.5 999.9 1003.6 1008.9 1011.4 1010.9 1014.0 999.9 DAY-HOUR 9- 3 5-15 2- 3 8- 3 20- 3 24-15 13-15 14-15 11- 0 31- 0 11-12 13-12 MEAN QFF PRESSURE IN HPA 1014.8 1013.9 1009.7 1008.3 1002.9 997.7 992.9 995.4 1001.7 1008.3 1014.1 1017.8 1006.5 MAX. QFF PRESSURE IN HPA 1022.6 1021.8 1018.3 1015.1 1012.0 1004.4 998.4 1001.6 1009.0 1013.4 1021.5 1024.2 1024.2 DAY-HOUR 10-18 22- 6 18- 6 10- 9 1- 9 6- 9 1- 6 18-18 30-18 29-18 15- 6 3- 6 MIN. QFF PRESSURE IN HPA 1002.0 1002.1 999.0 998.6 998.0 990.7 985.8 989.9 997.8 1003.2 1005.6 1010.1 985.8 DAY-HOUR 9- 3 5-15 2- 0 8- 0 24-15 24-12 12-15 4- 0 11- 0 9- 0 1- 0 31-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 864.3 864.1 861.5 862.8 861.6 859.0 855.9 858.8 861.3 865.2 866.0 868.0 862.4 MAX. QFE PRESSURE IN HPA 868.5 868.3 866.4 866.6 867.5 863.0 859.5 863.6 865.4 867.1 870.7 871.0 871.0 DAY 11 13 31 11 28 1 9 19 30 30 16 23 MIN. QFE PRESSURE IN HPA 856.6 854.0 852.7 855.7 858.1 853.4 852.0 855.2 859.0 861.2 861.6 864.0 852.0 DAY 9 6 2 8 20 25 12 15 11 31 1 14 MEAN QNH PRESSURE IN HPA 1014.9 1014.7 1011.7 1013.2 1011.8 1008.9 1005.3 1008.6 1011.5 1016.0 1016.9 1019.1 1012.7 MAX. QNH PRESSURE IN HPA 1019.7 1019.5 1017.3 1017.5 1018.5 1013.4 1009.4 1014.1 1016.1 1018.1 1022.2 1022.5 1022.5 DAY 11 13 31 11 28 1 9 19 30 30 16 23 MIN. QNH PRESSURE IN HPA 1006.1 1003.2 1001.7 1005.1 1007.8 1002.5 1000.9 1004.5 1008.9 1011.4 1011.8 1014.6 1000.9 DAY 9 6 2 8 20 25 12 15 11 31 1 14 MEAN QFF PRESSURE IN HPA 1014.5 1013.4 1009.2 1007.7 1002.5 997.2 992.3 994.8 1000.9 1007.7 1013.5 1017.2 1005.9 MAX. QFF PRESSURE IN HPA 1019.9 1020.4 1017.0 1013.9 1009.9 1002.8 997.3 1000.6 1006.1 1012.3 1019.7 1021.8 1021.8 DAY 22 22 18 11 2 7 1 19 30 28 16 5 MIN. QFF PRESSURE IN HPA 1004.0 1002.9 999.0 998.6 998.3 991.0 986.7 989.9 997.8 1003.2 1005.6 1013.1 986.7 DAY 9 6 2 8 25 25 12 4 11 9 1 14 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 864.0 864.1 861.6 862.8 861.9 859.2 856.1 859.1 861.6 865.5 866.0 868.0 862.5 MAX. QFE PRESSURE IN HPA 868.2 868.3 867.8 866.6 868.0 863.0 860.0 863.4 865.8 867.1 870.7 870.4 870.7 DAY 2 13 31 11 28 1 9 19 30 7 18 23 MIN. QFE PRESSURE IN HPA 854.4 855.5 852.0 855.6 857.6 854.0 852.0 855.8 859.0 861.5 861.6 864.0 852.0 DAY 9 6 2 8 20 25 12 15 12 31 1 14 MEAN QNH PRESSURE IN HPA 1014.5 1014.7 1011.8 1013.2 1012.1 1009.1 1005.5 1009.0 1011.8 1016.3 1016.8 1019.1 1012.8 MAX. QNH PRESSURE IN HPA 1019.3 1019.5 1018.9 1017.5 1019.1 1013.4 1010.0 1013.9 1016.6 1018.1 1022.2 1021.8 1022.2 DAY 2 13 31 11 28 1 9 19 30 7 18 23 MIN. QNH PRESSURE IN HPA 1003.6 1004.9 1000.9 1005.0 1007.3 1003.2 1000.9 1005.2 1008.9 1011.7 1011.8 1014.6 1000.9 DAY 9 6 2 8 20 25 12 15 12 31 1 14 MEAN QFF PRESSURE IN HPA 1014.9 1014.4 1009.9 1008.2 1003.2 997.8 993.0 995.7 1002.0 1008.9 1014.4 1018.2 1006.7 MAX. QFF PRESSURE IN HPA 1020.1 1021.4 1017.6 1014.2 1010.9 1003.5 998.2 1001.1 1007.7 1013.0 1021.1 1023.1 1023.1 DAY 22 22 18 11 2 6 1 19 30 30 29 5 MIN. QFF PRESSURE IN HPA 1002.0 1005.3 999.1 999.5 998.6 992.0 986.6 990.8 999.0 1004.7 1006.4 1012.7 986.6 DAY 9 6 2 8 20 21 12 3 10 4 1 31 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.8 864.9 862.3 863.7 862.6 859.9 856.7 859.7 862.3 866.4 866.8 868.7 863.2 MAX. QFE PRESSURE IN HPA 869.6 868.3 867.0 867.0 868.6 863.8 860.8 864.4 866.9 868.1 871.6 871.0 871.6 DAY 2 17 18 11 28 6 9 19 30 6 16 29 MIN. QFE PRESSURE IN HPA 856.9 858.8 852.6 855.9 857.9 854.5 852.1 856.1 859.7 862.7 861.4 864.9 852.1 DAY 9 5 2 8 20 24 13 14 12 31 1 14 MEAN QNH PRESSURE IN HPA 1015.4 1015.6 1012.6 1014.2 1012.9 1009.9 1006.2 1009.7 1012.6 1017.3 1017.7 1019.9 1013.7 MAX. QNH PRESSURE IN HPA 1020.9 1019.5 1018.0 1018.0 1019.8 1014.3 1010.9 1015.0 1017.9 1019.2 1023.2 1022.5 1023.2 DAY 2 17 18 11 28 6 9 19 30 6 16 29 MIN. QNH PRESSURE IN HPA 1006.5 1008.6 1001.6 1005.3 1007.6 1003.7 1001.0 1005.6 1009.7 1013.1 1011.6 1015.6 1001.0 DAY 9 5 2 8 20 24 13 14 12 31 1 14 MEAN QFF PRESSURE IN HPA 1015.8 1015.1 1010.3 1008.7 1003.3 998.0 993.3 996.0 1002.1 1009.2 1015.0 1018.9 1007.1 MAX. QFF PRESSURE IN HPA 1021.5 1021.8 1018.3 1014.2 1011.4 1004.3 998.4 1001.5 1008.3 1013.0 1021.5 1024.2 1024.2 DAY 22 22 18 10 1 6 1 19 30 27 15 3 MIN. QFF PRESSURE IN HPA 1004.6 1007.6 999.5 1000.1 998.3 991.1 987.3 992.1 998.7 1004.9 1006.3 1012.6 987.3 DAY 9 20 2 8 20 24 13 14 7 3 1 31 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 864.6 864.7 862.2 863.8 862.6 859.9 856.7 859.6 862.3 866.0 866.4 868.3 863.1 MAX. QFE PRESSURE IN HPA 869.1 868.2 867.5 867.0 868.4 864.0 860.6 864.1 866.9 868.5 871.5 870.9 871.5 DAY 11 17 30 11 28 6 9 19 30 11 16 5 MIN. QFE PRESSURE IN HPA 857.1 857.8 853.0 857.4 858.7 854.2 851.6 855.2 859.6 862.4 861.2 864.5 851.6 DAY 9 5 2 8 20 24 13 14 12 31 1 15 MEAN QNH PRESSURE IN HPA 1015.3 1015.4 1012.5 1014.4 1013.0 1009.9 1006.2 1009.5 1012.6 1016.9 1017.3 1019.5 1013.5 MAX. QNH PRESSURE IN HPA 1020.4 1019.3 1018.5 1018.0 1019.6 1014.6 1010.7 1014.7 1017.9 1019.7 1023.1 1022.4 1023.1 DAY 11 17 30 11 28 6 9 19 30 11 16 5 MIN. QNH PRESSURE IN HPA 1006.7 1007.5 1002.0 1007.0 1008.5 1003.4 1000.4 1004.5 1009.5 1012.7 1011.4 1015.1 1000.4 DAY 9 5 2 8 20 24 13 14 12 31 1 15 MEAN QFF PRESSURE IN HPA 1014.8 1014.1 1009.8 1008.8 1003.4 998.0 993.1 995.5 1001.9 1008.4 1013.9 1017.4 1006.6 MAX. QFF PRESSURE IN HPA 1020.3 1021.0 1017.7 1015.1 1012.0 1004.4 998.1 1000.7 1007.9 1012.2 1020.3 1023.1 1023.1 DAY 22 22 18 10 1 6 1 19 30 23 16 3 MIN. QFF PRESSURE IN HPA 1006.2 1006.5 999.4 1002.5 999.7 990.8 986.1 990.5 998.6 1004.0 1005.9 1011.8 986.1 DAY 9 20 2 8 20 24 13 14 12 3 1 31 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 863.6 863.4 861.3 863.0 861.9 859.4 856.2 858.8 861.5 865.2 865.7 867.5 862.3 MAX. QFE PRESSURE IN HPA 868.0 867.3 866.0 866.0 867.4 863.2 860.0 862.8 866.3 867.5 870.6 870.3 870.6 DAY 11 22 18 25 28 1 9 18 30 11 16 24 MIN. QFE PRESSURE IN HPA 857.1 855.0 853.2 857.2 858.3 854.0 851.4 854.8 859.1 862.2 860.8 863.5 851.4 DAY 9 5 2 8 20 24 13 14 15 31 11 13 MEAN QNH PRESSURE IN HPA 1014.1 1013.9 1011.4 1013.5 1012.1 1009.3 1005.7 1008.6 1011.8 1015.9 1016.4 1018.5 1012.6 MAX. QNH PRESSURE IN HPA 1019.1 1018.3 1016.8 1016.8 1018.4 1013.6 1010.0 1013.2 1017.2 1018.5 1022.1 1021.7 1022.1 DAY 11 22 18 25 28 1 9 18 30 11 16 24 MIN. QNH PRESSURE IN HPA 1006.7 1004.3 1002.2 1006.8 1008.1 1003.2 1000.2 1004.1 1009.0 1012.5 1010.9 1014.0 1000.2 DAY 9 5 2 8 20 24 13 14 15 31 11 13 MEAN QFF PRESSURE IN HPA 1013.7 1012.5 1008.9 1008.0 1002.7 997.7 992.7 994.8 1001.2 1007.7 1013.2 1016.5 1005.8 MAX. QFF PRESSURE IN HPA 1019.5 1019.9 1016.2 1013.6 1010.4 1003.5 998.0 999.8 1007.3 1011.9 1019.8 1021.9 1021.9 DAY 10 22 18 10 1 6 1 18 30 29 29 3 MIN. QFF PRESSURE IN HPA 1005.4 1003.8 999.9 1002.6 998.9 990.7 986.3 990.1 997.9 1003.3 1006.0 1010.1 986.3 DAY 8 5 2 8 25 24 13 14 10 9 1 31 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 863.9 863.6 861.5 862.8 861.5 859.0 856.1 858.7 861.6 865.1 865.9 868.0 862.3 MAX. QFE PRESSURE IN HPA 868.4 867.2 866.0 866.0 866.6 863.0 860.0 862.9 866.1 867.2 870.6 870.8 870.8 DAY 10 12 18 10 1 1 9 18 30 29 16 28 MIN. QFE PRESSURE IN HPA 856.9 853.4 854.2 858.0 858.0 853.4 851.1 854.4 859.4 862.0 861.2 864.0 851.1 DAY 8 5 2 7 20 24 13 14 15 31 11 15 MEAN QNH PRESSURE IN HPA 1014.4 1014.1 1011.7 1013.2 1011.7 1008.9 1005.5 1008.5 1011.8 1015.9 1016.8 1019.1 1012.6 MAX. QNH PRESSURE IN HPA 1019.6 1018.2 1016.8 1016.8 1017.5 1013.4 1010.0 1013.3 1016.9 1018.2 1022.1 1022.3 1022.3 DAY 10 12 18 10 1 1 9 18 30 29 16 28 MIN. QNH PRESSURE IN HPA 1006.5 1002.5 1003.4 1007.7 1007.7 1002.5 999.9 1003.6 1009.3 1012.3 1011.4 1014.6 999.9 DAY 8 5 2 7 20 24 13 14 15 31 11 15 MEAN QFF PRESSURE IN HPA 1014.7 1013.7 1009.8 1008.2 1002.6 997.6 993.0 995.2 1002.0 1008.5 1014.4 1018.1 1006.5 MAX. QFF PRESSURE IN HPA 1021.1 1020.2 1016.8 1014.4 1011.1 1003.6 998.2 1000.3 1008.0 1013.2 1020.8 1023.4 1023.4 DAY 10 22 17 10 1 6 1 18 30 29 29 4 MIN. QFF PRESSURE IN HPA 1005.0 1002.1 1002.1 1001.8 998.0 991.3 985.8 990.1 998.2 1003.7 1008.0 1011.1 985.8 DAY 8 5 2 7 24 24 12 14 10 8 11 31 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 864.6 864.4 862.1 863.5 862.3 859.7 856.8 859.7 862.4 865.7 866.5 868.6 863.0 MAX. QFE PRESSURE IN HPA 869.5 868.7 866.9 867.0 867.7 863.2 860.4 864.3 867.3 867.9 871.3 871.4 871.4 DAY 10 12 29 10 28 1 9 19 30 6 16 28 MIN. QFE PRESSURE IN HPA 858.0 854.0 855.8 857.5 859.0 853.9 851.8 855.7 860.0 862.5 861.7 864.4 851.8 DAY 8 5 2 7 20 24 13 14 11 30 11 15 MEAN QNH PRESSURE IN HPA 1015.2 1015.0 1012.4 1014.0 1012.6 1009.6 1006.4 1009.7 1012.7 1016.5 1017.4 1019.7 1013.4 MAX. QNH PRESSURE IN HPA 1020.8 1019.9 1017.9 1018.0 1018.8 1013.6 1010.5 1014.9 1018.3 1019.0 1022.9 1023.0 1023.0 DAY 10 12 29 10 28 1 9 19 30 6 16 28 MIN. QNH PRESSURE IN HPA 1007.7 1003.2 1005.2 1007.2 1008.9 1003.0 1000.7 1005.1 1010.0 1012.8 1011.9 1015.0 1000.7 DAY 8 5 2 7 20 24 13 14 11 30 11 15 MEAN QFF PRESSURE IN HPA 1015.5 1014.4 1010.0 1008.5 1002.9 997.7 993.5 996.0 1002.3 1008.4 1014.7 1018.6 1006.9 MAX. QFF PRESSURE IN HPA 1022.6 1021.2 1018.1 1014.6 1011.0 1003.2 998.2 1001.6 1009.0 1013.4 1020.8 1023.3 1023.3 DAY 10 22 17 10 1 6 1 18 30 29 15 28 MIN. QFF PRESSURE IN HPA 1004.9 1002.1 1002.9 1001.6 998.7 990.8 987.4 991.7 998.9 1004.0 1008.2 1013.0 987.4 DAY 8 5 20 7 24 24 12 14 7 3 11 31 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 864.6 864.3 862.1 863.5 862.2 859.6 856.6 859.4 862.0 865.5 866.5 868.4 862.9 MAX. QFE PRESSURE IN HPA 868.9 868.8 867.1 867.2 868.0 863.2 860.2 864.0 867.0 867.6 871.3 871.2 871.3 DAY 10 12 17 10 27 15 8 18 30 29 16 22 MIN. QFE PRESSURE IN HPA 858.0 854.6 855.0 856.1 859.0 853.9 852.2 855.2 859.6 861.5 861.7 864.5 852.2 DAY 8 5 1 7 19 24 13 14 11 30 11 13 MEAN QNH PRESSURE IN HPA 1015.3 1014.9 1012.4 1014.0 1012.5 1009.5 1006.1 1009.3 1012.3 1016.2 1017.4 1019.5 1013.3 MAX. QNH PRESSURE IN HPA 1020.1 1020.0 1018.1 1018.2 1019.1 1013.6 1010.2 1014.6 1018.0 1018.7 1022.9 1022.8 1022.9 DAY 10 12 17 10 27 15 8 18 30 29 16 22 MIN. QNH PRESSURE IN HPA 1007.7 1003.8 1004.3 1005.6 1008.9 1003.0 1001.1 1004.5 1009.5 1011.7 1011.9 1015.1 1001.1 DAY 8 5 1 7 19 24 13 14 11 30 11 13 MEAN QFF PRESSURE IN HPA 1014.8 1013.6 1009.6 1008.4 1002.8 997.6 992.9 995.3 1001.6 1007.8 1014.0 1017.4 1006.3 MAX. QFF PRESSURE IN HPA 1020.3 1020.5 1018.1 1014.7 1011.2 1002.8 997.1 1000.9 1007.8 1012.3 1019.7 1022.0 1022.0 DAY 22 21 17 10 1 6 8 18 30 29 15 3 MIN. QFF PRESSURE IN HPA 1005.0 1003.1 1001.2 999.2 998.8 991.1 987.5 991.0 998.0 1003.5 1007.8 1011.7 987.5 DAY 8 5 1 7 24 24 13 14 11 3 11 31 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 2000 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 3.7 5.5 9.4 17.6 21.8 26.7 31.9 30.5 24.5 17.3 10.5 6.7 17.2 MINIMUN AIR TEMPERATURE (C) -0.2 0.9 3.7 12.6 15.4 19.6 25.8 24.0 17.9 12.1 6.0 3.0 11.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 4 29 29 2 0 0 0 64 DAYS WITH MINIMUM TEMP. <=-4 4 0 0 0 0 0 0 0 0 0 0 0 4 DAYS WITH FREEZING MIN.<= 0 20 13 4 0 0 0 0 0 0 0 0 3 40 TEMPERATURE RECORDS LOWEST(C) -5.5 -3.4 -2.8 4.8 8.4 16.0 20.6 14.8 15.4 7.2 2.4 -0.2 -5.5 DAY 30 9 9 11 10 6 5 31 1 29 28 16 MAXIMUM AIR TEMPERATURE (C) 8.4 10.9 15.0 22.9 27.7 33.1 37.5 36.7 31.0 23.1 15.6 11.2 22.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 6 29 31 31 24 0 0 0 121 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 20.8 15.0 20.6 27.6 31.6 39.6 40.0 38.6 35.8 28.0 19.6 17.0 40.0 DAY 1 22 21 20 25 30 16 2 9 11 12 29 DIF. BETWEEN (MAX.-MIN.) (C) 8.6 10.0 11.3 10.3 12.3 13.5 11.7 12.7 13.1 11.0 9.6 8.2 11.1 MEAN DAILY TEMP. (MDT) (C) 4.1 5.9 9.3 17.7 21.5 26.4 31.6 30.4 24.5 17.6 10.8 7.1 17.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 4.5 41.0 161.4 330.1 290.7 104.0 0.7 0.0 0.0 932.4 HEATING DEG. DAYS(BASE 18 0C) 430.9 350.7 268.7 38.4 2.9 0.0 0.0 0.0 0.0 30.0 215.9 337.8 1675.3 DEWPOINT (MEAN C) -3.4 -4.9 -5.9 0.8 -1.1 -0.3 1.2 0.6 1.0 1.8 1.5 0.5 -0.7 MIXING RATIO (G/KG) 3.61 3.22 3.08 4.93 4.37 4.45 5.04 4.79 4.88 5.28 5.10 4.75 4.46 VAPOUR PRESSURE (HPA) 4.98 4.45 4.25 6.78 6.01 6.09 6.89 6.57 6.70 7.27 7.04 6.56 6.13 SATURATION DEF. (HPA) 3.32 4.88 8.16 13.93 21.04 30.29 41.28 38.43 24.99 13.00 5.95 3.46 17.40 RELATIVE HUMIDITY (MEAN %) 65 52 37 35 24 18 15 16 23 39 57 68 37 RELATIVE HUMIDITY (MAX. %) 83 70 55 51 39 27 22 25 33 53 71 83 51 RELATIVE HUMIDITY (MIN. %) 42 32 20 21 13 11 9 8 15 25 40 50 24 RELATIVE HUMIDITY (MEAN% 03UTC) 70 61 48 44 35 24 19 22 30 47 66 75 45 RELATIVE HUMIDITY (MEAN% 09UTC) 50 34 24 26 15 12 11 9 15 28 43 55 27 RELATIVE HUMIDITY (MEAN% 15UTC) 68 49 31 27 18 14 12 11 19 35 56 70 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 143.7 49.2 46.0 19.6 2.6 0.0 0.0 0.0 1.1 33.6 79.2 129.0 504.0 DAYS WITH PRECIPITATION >=10 5 1 1 1 0 0 0 0 0 2 3 6 19 DAYS WITH PRECIPITATION >= 5 6 3 2 1 0 0 0 0 0 3 3 9 27 DAYS WITH PRECIPITATION >= 1 7 4 3 4 1 0 0 0 1 4 5 13 42 DAYS WITH PRECIPITATION 10 5 4 7 4 0 0 0 2 8 9 15 64 GREATEST DAILY PRECIPITATION 50.0 30.6 38.0 14.0 2.1 0.0 0.0 0.0 1.0 14.0 30.8 19.0 50.0 DAY 5 13 24 9 8 ** ** ** 29 17 30 24 DAY WITH THUNDER STORM 4 2 3 4 4 0 0 0 1 4 2 5 29 DAYS WITH SNOW OR SLEET 3 2 0 0 0 0 0 0 0 0 0 1 6 DAYS WITH DUST 0 0 0 3 7 11 15 2 2 0 0 0 40 WIND DIRECTION (PREVAILING) 180 180 270 270 270 270 270 270 270 90 90 180 270 PREVAILING WIND SPEED(KNOTS) 10.5 9.0 8.8 8.8 10.9 11.6 11.1 9.8 11.0 6.5 6.4 8.3 9.6 PREVAILING WIND PERCENT 18.5 13.4 15.3 12.9 15.3 20.8 15.3 19.0 17.9 12.1 11.3 17.7 13.2 CALMS PERCENT OF WIND 61.7 53.0 48.4 50.4 41.5 42.9 36.3 46.0 52.1 50.0 52.5 54.8 49.1 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 178 191 219 241 280 293 330 301 270 190 175 174 241 VECTOR WIND MAGNITUDE(KNOTS) 2.2 1.8 2.7 1.6 2.6 2.4 1.7 2.5 2.1 1.1 1.3 2.2 1.3 WIND STEADINESES (MEAN %) 71.0 51.4 52.9 39.0 42.6 40.0 24.6 42.4 42.9 27.5 37.1 61.1 27.7 WIND SPEED (MEAN KNOTS) 3.1 3.5 5.1 4.1 6.1 6.0 6.9 5.9 4.9 4.0 3.5 3.6 4.7 FASTEST WIND DIRECTION 170 180 190 330 270 80 90 330 330 160 100 150 150 FASTEST WIND SPEED (KNOTS) 29 19 29 27 31 33 31 27 27 23 19 35 35 DAY 19 6 24 14 7 13 27 8 16 25 16 19 DAYS WITH SKY CLEAR (0-2)/8 14 17 21 11 26 30 26 30 27 20 17 11 250 DAYS WITH P.CLOUDY (3-6)/8 10 8 6 11 4 0 5 1 2 8 7 9 71 DAYS WITH CLOUDY (7-8)/8 7 4 4 8 1 0 0 0 1 3 6 11 45 DAYS WITH VISIBILITY =< 2 KM 4 1 1 3 2 0 6 0 0 0 0 0 17 DURATION OF SUNSHINE HOURS 176.0 218.4 273.7 211.6 334.9 368.9 301.4 352.6 294.8 262.1 208.4 175.2 3178.0 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 863.5 864.3 863.2 863.8 862.1 858.7 857.6 859.5 861.7 865.2 866.6 865.5 862.6 MAX. QFE PRESSURE IN HPA 872.1 869.5 867.4 868.4 866.8 862.3 863.0 862.7 866.6 869.9 871.0 871.5 872.1 DAY-HOUR 30- 9 11- 6 3- 6 2- 6 7- 6 17- 9 30- 9 14- 6 30- 6 30- 6 11- 6 17-18 MIN. QFE PRESSURE IN HPA 855.2 854.6 851.7 857.8 858.8 855.5 852.7 855.4 855.1 860.2 862.0 857.5 851.7 DAY-HOUR 28-15 7- 3 24- 9 21- 3 26-12 25- 3 10-12 11- 0 3- 0 2- 0 6-12 11- 0 MEAN QNH PRESSURE IN HPA 1014.0 1014.9 1013.7 1014.3 1012.4 1008.5 1007.2 1009.4 1011.9 1016.0 1017.6 1016.3 1013.0 MAX. QNH PRESSURE IN HPA 1023.8 1020.8 1018.4 1019.6 1017.7 1012.6 1013.4 1013.1 1017.5 1021.3 1022.5 1023.1 1023.8 DAY-HOUR 30- 9 11- 6 3- 6 2- 6 7- 6 17- 9 30- 9 14- 6 30- 6 30- 6 11- 6 17-18 MIN. QNH PRESSURE IN HPA 1004.5 1003.8 1000.5 1007.5 1008.6 1004.9 1001.7 1004.8 1004.4 1010.2 1012.3 1007.2 1000.5 DAY-HOUR 28-15 7- 3 24- 9 21- 3 26-12 25- 3 10-12 11- 0 3- 0 2- 0 6-12 11- 0 MEAN QFF PRESSURE IN HPA 1015.3 1015.2 1011.8 1007.8 1003.7 997.2 993.4 996.3 1001.8 1009.6 1014.9 1015.8 1006.9 MAX. QFF PRESSURE IN HPA 1028.3 1021.6 1019.9 1014.5 1010.4 1002.1 999.3 999.6 1008.2 1017.3 1020.9 1024.5 1028.3 DAY-HOUR 30- 6 10- 6 3- 6 12- 6 2- 6 17-12 30- 9 14- 3 30- 6 30- 6 28-15 17- 6 MIN. QFF PRESSURE IN HPA 1004.2 1004.2 995.5 999.4 998.2 993.3 987.3 990.9 994.3 1003.0 1008.8 1005.7 987.3 DAY-HOUR 28- 9 7- 0 24- 6 21- 3 25-21 25- 6 10-12 12- 0 3- 0 2- 0 6-12 11- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 863.5 864.2 863.1 863.3 861.8 858.5 857.4 859.1 861.1 864.9 866.5 865.4 862.4 MAX. QFE PRESSURE IN HPA 870.7 869.0 866.5 867.0 864.7 861.6 862.0 862.1 864.7 868.6 870.0 871.1 871.1 DAY 31 11 1 2 7 17 30 14 23 29 11 18 MIN. QFE PRESSURE IN HPA 856.6 855.0 854.9 859.0 859.2 856.2 853.0 855.4 855.1 860.2 862.7 857.5 853.0 DAY 28 7 2 21 25 24 11 11 3 2 7 11 MEAN QNH PRESSURE IN HPA 1014.0 1014.8 1013.5 1013.7 1012.1 1008.3 1007.1 1009.0 1011.2 1015.6 1017.4 1016.2 1012.7 MAX. QNH PRESSURE IN HPA 1022.2 1020.3 1017.4 1018.0 1015.4 1011.8 1012.3 1012.4 1015.4 1019.8 1021.4 1022.6 1022.6 DAY 31 11 1 2 7 17 30 14 23 29 11 18 MIN. QNH PRESSURE IN HPA 1006.1 1004.3 1004.2 1008.9 1009.1 1005.7 1002.0 1004.8 1004.4 1010.2 1013.1 1007.2 1002.0 DAY 28 7 2 21 25 24 11 11 3 2 7 11 MEAN QFF PRESSURE IN HPA 1014.9 1014.7 1011.4 1007.1 1003.4 997.1 993.1 995.7 1000.9 1008.9 1014.5 1015.3 1006.4 MAX. QFF PRESSURE IN HPA 1026.5 1020.4 1018.0 1013.2 1008.6 1001.2 997.5 998.6 1005.3 1016.4 1019.8 1022.7 1026.5 DAY 30 29 1 2 2 17 30 14 23 29 28 17 MIN. QFF PRESSURE IN HPA 1004.7 1004.2 998.3 999.9 998.7 994.4 988.3 990.9 994.3 1003.0 1009.1 1005.7 988.3 DAY 28 7 24 21 26 24 11 12 3 2 7 11 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 863.3 863.9 863.1 863.5 861.8 858.4 857.4 859.3 861.3 865.1 866.4 865.3 862.4 MAX. QFE PRESSURE IN HPA 870.6 868.2 866.2 867.6 864.8 861.4 862.0 862.3 865.7 868.6 870.4 870.7 870.7 DAY 30 11 1 2 2 17 30 14 29 29 11 18 MIN. QFE PRESSURE IN HPA 855.9 854.6 853.1 857.8 859.1 855.5 853.0 855.6 855.3 860.6 862.7 857.7 853.0 DAY 28 7 24 21 19 25 11 11 3 2 7 11 MEAN QNH PRESSURE IN HPA 1013.7 1014.5 1013.5 1014.0 1012.0 1008.2 1007.1 1009.2 1011.4 1015.8 1017.3 1016.0 1012.7 MAX. QNH PRESSURE IN HPA 1022.1 1019.3 1017.1 1018.7 1015.5 1011.6 1012.3 1012.6 1016.5 1019.8 1021.8 1022.2 1022.2 DAY 30 11 1 2 2 17 30 14 29 29 11 18 MIN. QNH PRESSURE IN HPA 1005.3 1003.8 1002.1 1007.5 1009.0 1004.9 1002.0 1005.0 1004.6 1010.7 1013.1 1007.4 1002.0 DAY 28 7 24 21 19 25 11 11 3 2 7 11 MEAN QFF PRESSURE IN HPA 1015.4 1015.4 1012.2 1007.8 1003.8 997.4 993.5 996.5 1001.9 1009.9 1015.4 1016.0 1007.1 MAX. QFF PRESSURE IN HPA 1027.9 1021.3 1018.3 1014.3 1009.6 1001.3 998.5 999.6 1007.0 1017.2 1020.6 1024.2 1027.9 DAY 30 29 1 2 2 17 30 14 29 29 28 17 MIN. QFF PRESSURE IN HPA 1004.9 1005.2 995.6 999.4 999.1 994.4 988.7 991.7 995.1 1004.7 1010.0 1006.1 988.7 DAY 28 7 24 21 25 25 13 11 2 2 7 11 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.0 864.7 863.7 864.5 862.5 858.8 857.9 859.9 862.2 866.0 867.2 866.0 863.1 MAX. QFE PRESSURE IN HPA 871.8 869.5 867.4 868.4 866.8 862.1 862.6 862.7 866.6 869.9 871.0 871.3 871.8 DAY 30 11 3 2 7 17 30 14 30 30 11 17 MIN. QFE PRESSURE IN HPA 856.7 855.6 852.4 859.5 859.6 855.7 853.4 856.0 856.1 861.9 863.5 859.4 852.4 DAY 28 7 24 21 26 25 11 11 2 2 2 11 MEAN QNH PRESSURE IN HPA 1014.5 1015.4 1014.2 1015.1 1012.9 1008.6 1007.6 1009.9 1012.5 1016.8 1018.2 1016.8 1013.5 MAX. QNH PRESSURE IN HPA 1023.4 1020.8 1018.4 1019.6 1017.7 1012.4 1013.0 1013.1 1017.5 1021.3 1022.5 1022.9 1023.4 DAY 30 11 3 2 7 17 30 14 30 30 11 17 MIN. QNH PRESSURE IN HPA 1006.2 1005.0 1001.3 1009.4 1009.5 1005.1 1002.5 1005.4 1005.6 1012.2 1014.0 1009.3 1001.3 DAY 28 7 24 21 26 25 11 11 2 2 2 11 MEAN QFF PRESSURE IN HPA 1016.0 1016.0 1012.4 1008.6 1004.0 997.1 993.8 996.6 1002.2 1010.5 1015.6 1016.7 1007.5 MAX. QFF PRESSURE IN HPA 1028.3 1021.6 1019.9 1014.5 1010.4 1001.1 999.0 999.3 1008.2 1017.3 1020.6 1024.5 1028.3 DAY 30 10 3 12 2 17 30 14 30 30 26 17 MIN. QFF PRESSURE IN HPA 1005.5 1007.3 995.5 1002.5 999.5 993.3 988.5 991.7 995.3 1005.1 1010.3 1007.7 988.5 DAY 28 7 24 21 25 25 10 11 2 1 2 10 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 863.6 864.7 863.6 864.5 862.6 858.9 857.9 859.9 862.1 865.6 866.8 865.7 863.0 MAX. QFE PRESSURE IN HPA 872.1 869.2 867.4 867.6 866.0 862.3 863.0 862.7 865.9 868.8 871.0 870.6 872.1 DAY 30 10 3 12 7 17 30 14 30 30 11 17 MIN. QFE PRESSURE IN HPA 855.7 855.9 851.7 860.5 859.3 855.9 853.1 856.0 855.7 861.6 863.3 859.4 851.7 DAY 28 7 24 21 26 25 11 11 2 1 2 11 MEAN QNH PRESSURE IN HPA 1014.1 1015.3 1014.1 1015.1 1012.9 1008.8 1007.6 1009.9 1012.4 1016.3 1017.7 1016.5 1013.4 MAX. QNH PRESSURE IN HPA 1023.8 1020.5 1018.4 1018.7 1016.8 1012.6 1013.4 1013.1 1016.7 1020.0 1022.5 1022.1 1023.8 DAY 30 10 3 12 7 17 30 14 30 30 11 17 MIN. QNH PRESSURE IN HPA 1005.1 1005.3 1000.5 1010.6 1009.2 1005.3 1002.1 1005.4 1005.1 1011.8 1013.8 1009.3 1000.5 DAY 28 7 24 21 26 25 11 11 2 1 2 11 MEAN QFF PRESSURE IN HPA 1015.0 1015.2 1011.9 1008.4 1004.0 997.3 993.6 996.5 1001.8 1009.6 1014.6 1015.5 1007.0 MAX. QFF PRESSURE IN HPA 1027.7 1021.0 1018.6 1014.0 1010.1 1001.6 999.3 999.3 1007.1 1014.9 1019.6 1022.4 1027.7 DAY 30 10 3 12 2 17 30 14 30 30 28 17 MIN. QFF PRESSURE IN HPA 1004.2 1007.7 995.9 1003.1 999.1 994.1 988.1 991.5 994.8 1004.0 1009.6 1007.4 988.1 DAY 28 7 24 15 25 25 10 11 2 1 2 10 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 862.8 863.6 862.7 863.7 862.0 858.6 857.4 859.2 861.4 864.8 866.0 864.9 862.3 MAX. QFE PRESSURE IN HPA 871.0 868.1 866.4 867.4 865.5 862.2 862.1 861.5 865.2 867.9 869.8 870.1 871.0 DAY 30 10 3 12 5 17 30 14 30 28 11 17 MIN. QFE PRESSURE IN HPA 855.7 856.1 853.8 860.8 858.8 855.8 852.7 855.4 855.5 861.0 862.0 859.0 852.7 DAY 28 7 24 9 26 25 10 11 2 1 6 14 MEAN QNH PRESSURE IN HPA 1013.2 1014.1 1013.1 1014.2 1012.3 1008.4 1007.0 1009.1 1011.6 1015.5 1016.9 1015.5 1012.6 MAX. QNH PRESSURE IN HPA 1022.5 1019.2 1017.3 1018.4 1016.3 1012.5 1012.4 1011.7 1015.9 1019.0 1021.2 1021.5 1022.5 DAY 30 10 3 12 5 17 30 14 30 28 11 17 MIN. QNH PRESSURE IN HPA 1005.1 1005.6 1002.9 1010.9 1008.6 1005.2 1001.7 1004.8 1004.9 1011.1 1012.3 1008.9 1001.7 DAY 28 7 24 9 26 25 10 11 2 1 6 14 MEAN QFF PRESSURE IN HPA 1014.2 1014.1 1010.9 1007.7 1003.6 997.2 993.0 996.0 1001.3 1008.8 1013.9 1014.7 1006.3 MAX. QFF PRESSURE IN HPA 1025.8 1019.5 1017.0 1013.8 1009.1 1002.1 997.5 998.4 1005.8 1014.8 1019.2 1021.6 1025.8 DAY 30 29 3 12 2 17 30 14 30 28 28 17 MIN. QFF PRESSURE IN HPA 1005.6 1005.6 999.3 1001.0 999.1 994.4 987.3 991.2 994.8 1003.5 1008.8 1006.5 987.3 DAY 28 6 23 20 26 25 10 11 2 1 6 10 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 863.2 863.8 862.7 863.3 861.6 858.3 857.0 859.0 861.4 865.0 866.6 865.4 862.3 MAX. QFE PRESSURE IN HPA 871.1 868.5 866.9 867.1 865.3 861.7 861.4 861.1 865.0 868.0 871.0 870.8 871.1 DAY 30 10 3 12 2 17 30 13 30 30 11 17 MIN. QFE PRESSURE IN HPA 855.2 855.9 855.0 860.0 858.9 855.7 852.7 855.4 855.7 861.2 862.5 859.0 852.7 DAY 28 6 24 20 8 25 10 11 2 1 6 14 MEAN QNH PRESSURE IN HPA 1013.7 1014.4 1013.0 1013.8 1011.9 1008.1 1006.6 1008.8 1011.6 1015.7 1017.5 1016.1 1012.6 MAX. QNH PRESSURE IN HPA 1022.6 1019.7 1017.9 1018.1 1016.0 1011.9 1011.6 1011.3 1015.7 1019.1 1022.5 1022.3 1022.6 DAY 30 10 3 12 2 17 30 13 30 30 11 17 MIN. QNH PRESSURE IN HPA 1004.5 1005.3 1004.3 1010.0 1008.7 1005.1 1001.7 1004.8 1005.1 1011.4 1012.8 1008.9 1001.7 DAY 28 6 24 20 8 25 10 11 2 1 6 14 MEAN QFF PRESSURE IN HPA 1015.4 1015.2 1011.7 1007.5 1003.6 997.3 993.1 996.2 1002.1 1009.9 1015.5 1016.0 1007.0 MAX. QFF PRESSURE IN HPA 1026.9 1020.8 1018.9 1013.5 1009.7 1001.6 997.6 998.4 1006.9 1015.8 1020.9 1023.3 1026.9 DAY 30 10 3 11 2 17 30 26 30 28 28 17 MIN. QFF PRESSURE IN HPA 1004.9 1006.5 998.6 1001.4 999.1 994.8 988.0 991.5 994.7 1005.3 1010.0 1007.2 988.0 DAY 28 6 23 20 25 25 10 11 2 1 6 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 864.0 864.6 863.6 864.0 862.3 859.1 857.9 859.9 862.2 865.4 867.0 865.9 863.0 MAX. QFE PRESSURE IN HPA 872.1 869.4 867.4 868.1 865.4 861.9 862.4 862.2 865.9 868.4 870.4 871.5 872.1 DAY 30 10 3 12 6 17 29 26 22 28 11 17 MIN. QFE PRESSURE IN HPA 856.9 857.0 855.4 861.1 859.5 856.6 853.5 856.4 856.5 861.4 862.7 859.4 853.5 DAY 28 6 23 21 25 24 10 11 2 1 6 14 MEAN QNH PRESSURE IN HPA 1014.5 1015.3 1014.1 1014.5 1012.6 1009.0 1007.6 1009.9 1012.5 1016.2 1017.9 1016.7 1013.4 MAX. QNH PRESSURE IN HPA 1023.8 1020.7 1018.4 1019.2 1016.1 1012.2 1012.7 1012.5 1016.7 1019.6 1021.8 1023.1 1023.8 DAY 30 10 3 12 6 17 29 26 22 28 11 17 MIN. QNH PRESSURE IN HPA 1006.5 1006.6 1004.8 1011.3 1009.4 1006.1 1002.6 1005.9 1006.0 1011.6 1013.1 1009.3 1002.6 DAY 28 6 23 21 25 24 10 11 2 1 6 14 MEAN QFF PRESSURE IN HPA 1016.1 1015.9 1012.2 1008.0 1003.7 997.4 993.8 996.6 1002.3 1009.9 1015.4 1016.6 1007.3 MAX. QFF PRESSURE IN HPA 1027.1 1021.4 1019.3 1013.9 1009.0 1001.1 998.7 999.1 1007.1 1016.4 1020.1 1023.9 1027.1 DAY 30 10 3 11 10 16 29 26 30 28 25 17 MIN. QFF PRESSURE IN HPA 1006.5 1007.6 999.0 1002.9 998.5 994.6 988.8 992.1 995.4 1004.5 1009.5 1008.6 988.8 DAY 28 6 23 14 25 23 10 11 2 1 6 9 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 863.9 864.6 863.6 863.9 862.4 859.0 857.9 859.7 861.9 865.4 866.8 865.8 862.9 MAX. QFE PRESSURE IN HPA 871.8 869.4 866.8 867.4 865.2 861.6 862.8 862.4 865.4 869.0 870.2 871.1 871.8 DAY 30 10 3 1 6 16 30 13 22 28 11 17 MIN. QFE PRESSURE IN HPA 856.6 856.1 856.0 861.0 859.2 856.4 853.5 856.1 856.0 861.0 862.7 858.6 853.5 DAY 27 6 23 20 25 24 10 11 2 1 6 10 MEAN QNH PRESSURE IN HPA 1014.5 1015.3 1014.1 1014.5 1012.7 1008.8 1007.6 1009.6 1012.2 1016.1 1017.8 1016.6 1013.3 MAX. QNH PRESSURE IN HPA 1023.4 1020.7 1017.7 1018.4 1015.9 1011.8 1013.2 1012.7 1016.1 1020.3 1021.6 1022.6 1023.4 DAY 30 10 3 1 6 16 30 13 22 28 11 17 MIN. QNH PRESSURE IN HPA 1006.1 1005.6 1005.4 1011.1 1009.1 1005.9 1002.6 1005.6 1005.4 1011.1 1013.1 1008.4 1002.6 DAY 27 6 23 20 25 24 10 11 2 1 6 10 MEAN QFF PRESSURE IN HPA 1015.4 1015.1 1011.7 1007.7 1003.7 997.3 993.5 996.2 1001.6 1009.4 1014.6 1015.7 1006.8 MAX. QFF PRESSURE IN HPA 1026.0 1020.6 1017.9 1013.3 1009.0 1000.9 998.7 998.8 1006.0 1016.6 1019.6 1023.2 1026.0 DAY 30 28 9 1 10 16 29 26 22 28 28 16 MIN. QFF PRESSURE IN HPA 1004.9 1005.6 999.1 1003.0 998.2 994.5 988.5 991.2 995.0 1003.4 1008.9 1006.5 988.5 DAY 27 6 23 20 25 24 10 11 2 1 6 10 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 2001 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.1 6.0 12.2 16.2 21.3 27.0 29.9 31.1 25.8 19.8 11.5 8.8 17.9 MINIMUN AIR TEMPERATURE (C) 0.7 1.2 7.1 10.6 15.0 20.2 23.5 24.5 19.8 14.4 6.5 5.2 12.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 13 25 28 8 0 0 0 76 DAYS WITH MINIMUM TEMP. <=-4 1 0 0 0 0 0 0 0 0 0 1 0 2 DAYS WITH FREEZING MIN.<= 0 9 5 0 0 0 0 0 0 0 0 3 2 19 TEMPERATURE RECORDS LOWEST(C) -5.4 -3.0 3.4 5.8 9.0 15.6 19.2 19.4 16.2 7.6 -4.0 -0.6 -5.4 DAY 27 22 12 10 9 9 3 31 30 31 19 22 MAXIMUM AIR TEMPERATURE (C) 10.7 11.4 17.9 21.9 27.4 33.3 35.9 37.2 32.0 25.6 17.4 13.1 23.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 6 27 31 31 30 3 0 0 128 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 16.6 18.6 23.6 26.4 34.4 38.4 39.6 40.6 35.2 31.2 25.4 16.6 40.6 DAY 17 28 31 25 15 22 24 4 2 5 4 10 DIF. BETWEEN (MAX.-MIN.) (C) 10.0 10.2 10.8 11.3 12.4 13.1 12.4 12.7 12.2 11.2 10.9 7.9 11.2 MEAN DAILY TEMP. (MDT) (C) 5.7 6.3 12.5 16.2 21.2 26.8 29.7 30.8 25.9 20.0 12.0 9.1 18.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 45.9 172.9 269.0 304.5 146.5 19.2 0.0 0.0 958.0 HEATING DEG. DAYS(BASE 18 0C) 380.8 328.3 171.5 69.7 7.3 0.0 0.0 0.0 0.0 15.4 186.7 275.2 1434.8 DEWPOINT (MEAN C) -3.6 -2.4 2.9 2.0 1.8 2.7 3.9 6.2 1.7 1.8 -2.5 1.4 1.3 MIXING RATIO (G/KG) 3.54 3.81 5.58 5.33 5.23 5.86 6.06 7.20 5.13 5.21 3.86 5.23 5.17 VAPOUR PRESSURE (HPA) 4.89 5.26 7.68 7.33 7.18 7.98 8.27 9.84 7.05 7.18 5.33 7.22 7.10 SATURATION DEF. (HPA) 4.19 4.38 7.00 11.86 19.28 29.04 35.14 36.73 27.09 16.70 9.13 4.30 17.07 RELATIVE HUMIDITY (MEAN %) 58 59 57 43 30 24 20 22 22 33 41 63 39 RELATIVE HUMIDITY (MAX. %) 75 79 73 61 44 35 29 31 32 46 57 79 53 RELATIVE HUMIDITY (MIN. %) 37 38 39 28 19 15 13 15 13 21 24 45 26 RELATIVE HUMIDITY (MEAN% 03UTC) 64 66 62 51 37 31 28 28 29 42 46 70 46 RELATIVE HUMIDITY (MEAN% 09UTC) 41 43 43 31 21 17 15 16 14 24 27 50 29 RELATIVE HUMIDITY (MEAN% 15UTC) 63 57 54 36 25 18 15 18 18 30 43 66 37 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 112.0 48.0 108.3 33.0 6.8 0.0 0.0 0.0 1.0 10.6 23.1 108.1 450.9 DAYS WITH PRECIPITATION >=10 4 2 5 1 0 0 0 0 0 0 1 3 16 DAYS WITH PRECIPITATION >= 5 5 5 7 3 0 0 0 0 0 1 1 5 27 DAYS WITH PRECIPITATION >= 1 7 7 7 5 2 0 0 0 1 2 3 8 42 DAYS WITH PRECIPITATION 7 9 9 5 5 0 0 0 1 5 5 14 60 GREATEST DAILY PRECIPITATION 47.0 12.0 35.0 12.0 4.0 0.0 0.0 0.0 1.0 6.0 19.5 44.0 47.0 DAY 26 14 25 7 4 ** ** ** 30 28 18 1 DAY WITH THUNDER STORM 2 4 2 0 2 0 0 0 1 4 1 2 18 DAYS WITH SNOW OR SLEET 5 2 1 0 0 0 0 0 0 0 1 0 9 DAYS WITH DUST 0 1 0 0 4 0 0 0 0 1 0 0 6 WIND DIRECTION (PREVAILING) 90 180 270 270 270 270 270 315 270 270 180 180 270 PREVAILING WIND SPEED(KNOTS) 7.5 12.2 8.5 10.5 11.7 10.7 10.1 11.5 9.1 7.7 9.6 8.6 9.4 PREVAILING WIND PERCENT 11.7 13.8 16.1 14.2 15.7 17.9 21.8 14.9 14.6 12.5 18.3 23.8 12.8 CALMS PERCENT OF WIND 56.0 45.5 48.0 42.9 38.7 38.3 47.2 46.0 44.2 49.6 50.8 52.4 46.7 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 134 160 198 239 270 330 285 311 267 205 183 187 233 VECTOR WIND MAGNITUDE(KNOTS) 1.4 2.4 1.8 2.2 2.6 1.7 2.6 2.8 1.3 1.5 2.4 2.5 1.2 WIND STEADINESES (MEAN %) 40.0 44.4 36.7 44.0 37.7 25.0 52.0 51.9 26.0 35.7 64.9 64.1 24.0 WIND SPEED (MEAN KNOTS) 3.5 5.4 4.9 5.0 6.9 6.8 5.0 5.4 5.0 4.2 3.7 3.9 5.0 FASTEST WIND DIRECTION 120 130 120 140 160 100 300 330 200 190 180 150 120 FASTEST WIND SPEED (KNOTS) 43 31 39 29 33 31 19 29 39 35 31 23 43 DAY 3 9 24 5 2 11 21 12 28 25 22 29 DAYS WITH SKY CLEAR (0-2)/8 17 11 18 14 19 30 30 27 28 23 15 11 243 DAYS WITH P.CLOUDY (3-6)/8 10 11 5 12 9 0 1 4 2 8 12 12 86 DAYS WITH CLOUDY (7-8)/8 4 6 8 4 3 0 0 0 0 0 3 8 36 DAYS WITH VISIBILITY =< 2 KM 2 2 0 0 0 0 0 0 0 0 0 0 4 DURATION OF SUNSHINE HOURS 225.1 197.6 241.7 272.0 299.9 370.3 366.3 351.7 313.0 280.0 219.5 172.7 3309.8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.4 864.0 863.6 863.5 861.0 857.9 856.9 860.3 862.8 865.3 866.2 866.9 862.8 MAX. QFE PRESSURE IN HPA 870.5 869.6 871.2 871.4 866.1 862.7 860.6 863.5 867.5 868.6 872.4 872.5 872.5 DAY-HOUR 14- 9 28-18 1- 6 1- 9 16-18 1-18 28- 6 10- 6 23- 6 10- 6 14- 6 28- 6 MIN. QFE PRESSURE IN HPA 857.4 855.1 851.3 858.1 853.8 854.0 852.6 857.2 859.4 860.5 853.9 857.9 851.3 DAY-HOUR 26-12 21- 0 25- 0 26- 3 2-12 17- 0 18- 3 24- 9 14- 0 1-12 18- 6 4-18 MEAN QNH PRESSURE IN HPA 1016.2 1014.6 1014.1 1014.0 1011.2 1007.6 1006.5 1010.3 1013.2 1016.1 1017.1 1017.9 1013.2 MAX. QNH PRESSURE IN HPA 1022.0 1020.9 1022.8 1023.0 1016.9 1013.1 1010.7 1014.0 1018.5 1019.8 1024.1 1024.2 1024.2 DAY-HOUR 14- 9 28-18 1- 6 1- 9 16-18 1-18 28- 6 10- 6 23- 6 10- 6 14- 6 28- 6 MIN. QNH PRESSURE IN HPA 1007.0 1004.4 1000.1 1007.8 1002.9 1003.2 1001.6 1006.8 1009.3 1010.6 1003.0 1007.6 1000.1 DAY-HOUR 26-12 21- 0 25- 0 26- 3 2-12 17- 0 18- 3 24- 9 14- 0 1-12 18- 6 4-18 MEAN QFF PRESSURE IN HPA 1016.7 1014.5 1010.4 1008.2 1002.6 996.0 993.5 996.7 1002.3 1008.4 1014.0 1016.2 1006.6 MAX. QFF PRESSURE IN HPA 1024.1 1019.8 1019.4 1016.5 1010.2 1003.5 997.7 1001.0 1007.9 1014.5 1023.9 1025.1 1025.1 DAY-HOUR 30- 6 13- 6 1- 6 1- 6 5- 6 1- 6 2- 6 31-15 23- 6 31-15 20- 6 22- 6 MIN. QFF PRESSURE IN HPA 1007.4 1002.8 997.3 1000.1 994.2 990.7 989.5 992.9 997.9 1000.8 1000.3 1005.3 989.5 DAY-HOUR 3-12 21- 0 25- 0 25-21 29-18 16-12 18- 0 7-15 4-15 1- 0 18- 6 4-18 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 865.3 863.8 863.3 863.0 860.5 857.6 856.6 859.9 862.5 865.0 866.2 866.9 862.5 MAX. QFE PRESSURE IN HPA 868.9 867.6 869.5 868.8 864.2 862.0 859.3 862.4 866.2 867.4 871.0 871.1 871.1 DAY 14 28 1 2 18 1 29 10 23 10 15 28 MIN. QFE PRESSURE IN HPA 859.4 855.1 851.3 858.4 856.2 854.0 852.8 857.3 859.4 860.9 856.0 859.2 851.3 DAY 26 21 25 26 30 17 18 25 14 1 18 5 MEAN QNH PRESSURE IN HPA 1016.0 1014.3 1013.7 1013.4 1010.6 1007.2 1006.1 1009.9 1012.9 1015.7 1017.1 1017.9 1012.9 MAX. QNH PRESSURE IN HPA 1020.1 1018.7 1020.8 1020.0 1014.8 1012.3 1009.2 1012.7 1017.1 1018.4 1022.5 1022.6 1022.6 DAY 14 28 1 2 18 1 29 10 23 10 15 28 MIN. QNH PRESSURE IN HPA 1009.3 1004.4 1000.1 1008.2 1005.7 1003.2 1001.8 1006.9 1009.3 1011.0 1005.4 1009.1 1000.1 DAY 26 21 25 26 30 17 18 25 14 1 18 5 MEAN QFF PRESSURE IN HPA 1016.0 1014.0 1009.9 1007.5 1001.9 995.7 993.1 996.1 1001.8 1007.5 1013.6 1015.9 1006.1 MAX. QFF PRESSURE IN HPA 1021.5 1018.8 1017.0 1012.6 1006.5 1002.5 996.2 1000.0 1005.7 1012.0 1022.4 1023.1 1023.1 DAY 30 16 1 1 6 1 3 31 23 31 20 22 MIN. QFF PRESSURE IN HPA 1009.8 1002.8 997.3 1000.2 994.9 991.1 989.5 993.7 998.1 1000.8 1001.8 1006.9 989.5 DAY 3 21 25 26 30 16 18 24 5 1 18 5 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 865.2 864.0 863.4 863.1 860.6 857.6 856.7 860.0 862.7 865.1 866.2 866.9 862.6 MAX. QFE PRESSURE IN HPA 869.4 868.1 870.3 869.5 864.2 862.3 859.7 863.0 866.2 868.0 871.0 870.9 871.0 DAY 14 28 1 1 18 1 29 10 23 10 15 28 MIN. QFE PRESSURE IN HPA 858.6 855.7 851.8 858.1 856.2 854.1 852.6 857.3 859.4 860.9 854.7 859.5 851.8 DAY 26 21 25 26 30 17 18 25 14 1 18 5 MEAN QNH PRESSURE IN HPA 1015.9 1014.5 1013.9 1013.5 1010.7 1007.3 1006.2 1010.0 1013.0 1015.8 1017.0 1017.8 1013.0 MAX. QNH PRESSURE IN HPA 1020.7 1019.2 1021.7 1020.8 1014.8 1012.6 1009.7 1013.4 1017.1 1019.1 1022.5 1022.4 1022.5 DAY 14 28 1 1 18 1 29 10 23 10 15 28 MIN. QNH PRESSURE IN HPA 1008.4 1005.1 1000.7 1007.8 1005.7 1003.3 1001.6 1006.9 1009.3 1011.0 1004.0 1009.4 1000.7 DAY 26 21 25 26 30 17 18 25 14 1 18 5 MEAN QFF PRESSURE IN HPA 1017.1 1015.0 1010.8 1008.1 1002.6 996.1 993.6 996.9 1002.8 1008.7 1014.6 1016.6 1006.9 MAX. QFF PRESSURE IN HPA 1023.0 1019.8 1019.1 1014.8 1008.4 1003.1 996.6 1000.7 1006.5 1013.3 1022.4 1024.8 1024.8 DAY 30 16 1 1 5 1 2 31 23 31 20 22 MIN. QFF PRESSURE IN HPA 1009.8 1004.8 999.7 1000.9 996.0 991.5 990.0 994.3 998.7 1001.3 1000.5 1008.2 990.0 DAY 3 21 25 26 30 16 18 17 5 1 18 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.9 864.6 864.2 864.0 861.4 858.2 857.1 860.7 863.4 866.0 866.9 867.6 863.3 MAX. QFE PRESSURE IN HPA 870.1 869.0 871.2 871.0 865.2 862.6 860.6 863.5 867.5 868.6 872.4 872.5 872.5 DAY 14 28 1 1 18 1 28 10 23 10 14 28 MIN. QFE PRESSURE IN HPA 858.1 856.4 852.2 859.4 856.4 855.0 853.3 857.7 860.4 861.1 853.9 860.3 852.2 DAY 26 21 25 26 2 16 18 25 14 1 18 5 MEAN QNH PRESSURE IN HPA 1016.7 1015.2 1014.8 1014.5 1011.6 1007.9 1006.7 1010.8 1013.8 1016.9 1017.8 1018.7 1013.8 MAX. QNH PRESSURE IN HPA 1021.5 1020.3 1022.8 1022.5 1015.9 1013.0 1010.7 1014.0 1018.5 1019.8 1024.1 1024.2 1024.2 DAY 14 28 1 1 18 1 28 10 23 10 14 28 MIN. QNH PRESSURE IN HPA 1007.8 1005.9 1001.1 1009.3 1005.9 1004.3 1002.4 1007.4 1010.5 1011.3 1003.0 1010.3 1001.1 DAY 26 21 25 26 2 16 18 25 14 1 18 5 MEAN QFF PRESSURE IN HPA 1017.7 1015.5 1011.3 1008.6 1003.0 996.3 993.6 997.1 1003.0 1009.1 1014.9 1017.4 1007.3 MAX. QFF PRESSURE IN HPA 1024.1 1019.8 1019.4 1016.5 1010.2 1003.5 997.7 1001.0 1007.9 1013.5 1023.9 1025.1 1025.1 DAY 30 13 1 1 5 1 2 31 23 30 20 22 MIN. QFF PRESSURE IN HPA 1009.4 1006.8 999.4 1002.5 996.1 990.9 990.0 994.0 999.4 1001.4 1000.3 1008.5 990.0 DAY 3 21 25 26 29 16 18 25 14 1 18 5 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.8 864.5 864.1 864.1 861.6 858.3 857.2 860.7 863.2 865.7 866.3 867.1 863.2 MAX. QFE PRESSURE IN HPA 870.5 868.8 870.0 871.4 865.6 862.7 860.2 863.0 866.7 868.1 872.0 872.0 872.0 DAY 14 28 1 1 16 3 28 15 23 9 14 9 MIN. QFE PRESSURE IN HPA 857.8 856.4 851.8 860.0 856.0 855.1 853.3 857.2 859.9 860.8 854.6 860.2 851.8 DAY 26 21 25 26 2 16 18 24 5 1 18 5 MEAN QNH PRESSURE IN HPA 1016.6 1015.1 1014.7 1014.6 1011.8 1008.0 1006.8 1010.8 1013.6 1016.5 1017.2 1018.1 1013.7 MAX. QNH PRESSURE IN HPA 1022.0 1020.0 1021.4 1023.0 1016.4 1013.1 1010.2 1013.4 1017.6 1019.2 1023.7 1023.7 1023.7 DAY 14 28 1 1 16 3 28 15 23 9 14 9 MIN. QNH PRESSURE IN HPA 1007.5 1005.9 1000.7 1010.0 1005.4 1004.4 1002.4 1006.8 1009.9 1010.9 1003.8 1010.2 1000.7 DAY 26 21 25 26 2 16 18 24 5 1 18 5 MEAN QFF PRESSURE IN HPA 1016.6 1014.8 1010.7 1008.6 1003.1 996.4 993.6 996.9 1002.5 1008.4 1013.7 1016.0 1006.8 MAX. QFF PRESSURE IN HPA 1023.3 1018.9 1017.3 1015.8 1008.1 1003.0 997.4 1000.9 1006.4 1013.6 1021.7 1022.8 1023.3 DAY 30 13 4 1 5 1 2 31 23 31 20 22 MIN. QFF PRESSURE IN HPA 1009.0 1006.4 999.4 1002.7 996.2 991.2 990.2 993.1 998.0 1001.2 1002.9 1008.5 990.2 DAY 3 21 25 26 29 16 18 24 5 1 17 5 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 864.7 863.3 863.1 863.5 860.9 857.8 856.7 860.0 862.4 864.9 865.6 866.1 862.4 MAX. QFE PRESSURE IN HPA 869.4 867.9 868.7 870.4 865.9 861.9 859.5 862.4 865.9 867.4 870.9 871.0 871.0 DAY 14 28 4 1 16 3 27 5 23 9 14 9 MIN. QFE PRESSURE IN HPA 857.4 855.8 851.8 860.0 853.8 854.7 853.1 857.2 859.6 860.5 855.5 858.8 851.8 DAY 26 21 25 26 2 16 18 24 2 1 18 4 MEAN QNH PRESSURE IN HPA 1015.4 1013.8 1013.5 1014.0 1011.0 1007.4 1006.3 1010.0 1012.7 1015.6 1016.4 1017.0 1012.8 MAX. QNH PRESSURE IN HPA 1020.7 1019.0 1019.9 1021.8 1016.7 1012.2 1009.4 1012.7 1016.7 1018.4 1022.4 1022.5 1022.5 DAY 14 28 4 1 16 3 27 5 23 9 14 9 MIN. QNH PRESSURE IN HPA 1007.0 1005.2 1000.7 1010.0 1002.9 1004.0 1002.1 1006.8 1009.5 1010.6 1004.9 1008.6 1000.7 DAY 26 21 25 26 2 16 18 24 2 1 18 4 MEAN QFF PRESSURE IN HPA 1015.4 1013.4 1009.6 1008.0 1002.3 995.9 993.3 996.3 1001.7 1007.6 1012.9 1015.0 1006.0 MAX. QFF PRESSURE IN HPA 1021.6 1018.1 1016.0 1014.6 1007.5 1001.6 997.3 1000.0 1005.3 1013.4 1020.8 1021.0 1021.6 DAY 30 24 4 1 18 1 2 31 23 31 19 22 MIN. QFF PRESSURE IN HPA 1007.4 1006.1 999.7 1002.6 995.0 990.7 989.9 993.3 998.0 1001.2 1002.4 1005.5 989.9 DAY 3 18 25 25 29 16 18 7 2 1 17 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.2 863.4 863.2 863.3 860.7 857.5 856.5 859.8 862.3 864.9 866.0 866.6 862.4 MAX. QFE PRESSURE IN HPA 869.4 868.4 869.0 870.2 865.4 861.8 859.1 862.3 865.6 867.5 871.3 871.2 871.3 DAY 14 28 1 1 16 3 27 20 23 9 14 9 MIN. QFE PRESSURE IN HPA 858.5 855.4 852.6 859.2 854.2 854.4 853.0 857.2 859.6 861.1 856.6 858.2 852.6 DAY 26 20 25 25 2 16 17 24 2 1 17 4 MEAN QNH PRESSURE IN HPA 1015.9 1013.9 1013.6 1013.7 1010.7 1007.2 1006.1 1009.8 1012.6 1015.6 1016.8 1017.5 1012.8 MAX. QNH PRESSURE IN HPA 1020.7 1019.6 1020.3 1021.6 1016.1 1012.0 1009.0 1012.6 1016.4 1018.5 1022.9 1022.8 1022.9 DAY 14 28 1 1 16 3 27 20 23 9 14 9 MIN. QNH PRESSURE IN HPA 1008.3 1004.8 1001.6 1009.1 1003.4 1003.6 1002.0 1006.8 1009.5 1011.3 1006.1 1007.9 1001.6 DAY 26 20 25 25 2 16 17 24 2 1 17 4 MEAN QFF PRESSURE IN HPA 1017.0 1014.2 1010.3 1008.3 1002.6 995.9 993.5 996.6 1002.4 1008.5 1014.4 1016.2 1006.7 MAX. QFF PRESSURE IN HPA 1023.7 1018.6 1016.9 1015.3 1007.3 1001.4 996.8 1001.0 1006.2 1014.5 1022.4 1024.5 1024.5 DAY 30 16 1 1 4 1 2 31 28 31 19 22 MIN. QFF PRESSURE IN HPA 1009.2 1005.0 999.4 1001.4 994.8 991.3 990.2 992.9 997.9 1002.5 1003.2 1005.6 990.2 DAY 3 20 24 25 2 16 18 7 4 1 17 4 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 865.7 864.2 863.7 863.8 861.3 858.2 857.3 860.6 863.1 865.7 866.5 867.2 863.1 MAX. QFE PRESSURE IN HPA 869.6 869.6 869.0 870.4 866.1 862.7 859.9 863.2 866.4 867.9 871.3 871.2 871.3 DAY 14 28 1 1 16 1 27 20 23 9 14 9 MIN. QFE PRESSURE IN HPA 859.9 857.0 853.2 859.7 856.2 854.7 853.6 857.6 860.4 862.3 857.2 857.9 853.2 DAY 26 20 24 25 29 11 17 24 13 1 17 4 MEAN QNH PRESSURE IN HPA 1016.5 1014.8 1014.2 1014.3 1011.5 1008.0 1006.9 1010.7 1013.5 1016.4 1017.4 1018.2 1013.5 MAX. QNH PRESSURE IN HPA 1020.9 1020.9 1020.3 1021.8 1016.9 1013.1 1009.9 1013.6 1017.3 1019.0 1022.9 1022.8 1022.9 DAY 14 28 1 1 16 1 27 20 23 9 14 9 MIN. QNH PRESSURE IN HPA 1009.9 1006.6 1002.2 1009.7 1005.7 1004.0 1002.7 1007.3 1010.5 1012.6 1006.8 1007.6 1002.2 DAY 26 20 24 25 29 11 17 24 13 1 17 4 MEAN QFF PRESSURE IN HPA 1017.5 1014.9 1010.6 1008.4 1002.7 996.3 993.8 997.0 1002.6 1008.8 1014.5 1016.8 1007.0 MAX. QFF PRESSURE IN HPA 1023.6 1018.9 1016.3 1015.5 1008.0 1003.0 996.4 1000.6 1006.6 1014.3 1023.7 1024.6 1024.6 DAY 30 24 3 1 4 1 2 31 23 31 19 22 MIN. QFF PRESSURE IN HPA 1009.5 1005.9 998.9 1001.3 994.2 991.9 990.4 994.2 998.6 1003.6 1003.6 1005.3 990.4 DAY 3 20 24 25 29 16 17 24 4 1 17 4 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 865.7 864.3 863.7 863.7 861.3 858.0 857.2 860.4 863.0 865.6 866.3 867.2 863.0 MAX. QFE PRESSURE IN HPA 869.3 869.6 869.0 870.4 865.0 862.7 859.8 863.2 866.2 867.9 871.3 871.4 871.4 DAY 14 28 1 1 16 1 27 20 22 9 14 27 MIN. QFE PRESSURE IN HPA 859.6 857.0 854.2 859.3 856.2 854.8 853.4 857.3 860.0 862.5 857.2 858.8 853.4 DAY 3 20 24 25 29 16 17 24 13 1 17 4 MEAN QNH PRESSURE IN HPA 1016.4 1014.9 1014.2 1014.2 1011.5 1007.7 1006.8 1010.5 1013.4 1016.4 1017.2 1018.2 1013.5 MAX. QNH PRESSURE IN HPA 1020.6 1020.9 1020.3 1021.8 1015.7 1013.1 1009.8 1013.6 1017.1 1019.0 1022.9 1023.0 1023.0 DAY 14 28 1 1 16 1 27 20 22 9 14 27 MIN. QNH PRESSURE IN HPA 1009.5 1006.6 1003.4 1009.2 1005.7 1004.1 1002.5 1006.9 1010.0 1012.8 1006.8 1008.6 1002.5 DAY 3 20 24 25 29 16 17 24 13 1 17 4 MEAN QFF PRESSURE IN HPA 1016.4 1014.4 1010.1 1008.1 1002.7 996.0 993.6 996.6 1002.2 1008.3 1013.6 1016.2 1006.5 MAX. QFF PRESSURE IN HPA 1022.0 1019.0 1016.8 1013.7 1007.2 1003.3 996.4 1000.7 1005.7 1014.3 1022.7 1023.1 1023.1 DAY 29 24 3 1 12 1 2 31 23 31 19 22 MIN. QFF PRESSURE IN HPA 1008.2 1004.7 1001.6 1000.1 994.8 991.7 990.0 994.0 998.6 1003.9 1002.7 1006.8 990.0 DAY 3 20 24 25 29 15 17 23 13 1 17 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 2002 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 3.9 7.3 11.6 13.8 20.9 26.8 29.8 28.9 26.4 21.0 11.8 5.2 17.3 MINIMUN AIR TEMPERATURE (C) 0.7 2.9 6.6 9.6 14.7 20.5 23.3 22.2 19.9 16.0 8.0 2.2 12.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 14 30 20 11 0 0 0 76 DAYS WITH MINIMUM TEMP. <=-4 2 0 0 0 0 0 0 0 0 0 0 1 3 DAYS WITH FREEZING MIN.<= 0 15 2 0 0 0 0 0 0 0 0 0 9 26 TEMPERATURE RECORDS LOWEST(C) -5.6 -1.0 1.2 2.8 10.2 14.6 20.6 19.0 16.6 10.4 2.8 -4.6 -5.6 DAY 24 1 30 4 4 21 1 23 16 23 29 14 MAXIMUM AIR TEMPERATURE (C) 8.2 12.2 16.6 18.1 26.3 32.3 35.4 35.1 32.8 26.7 16.5 9.0 22.4 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 7 25 31 31 30 8 0 0 132 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 13.8 17.0 22.0 26.4 32.6 35.6 38.0 39.0 37.4 31.8 21.4 15.6 39.0 DAY 26 6 26 28 28 28 21 13 2 9 10 9 DIF. BETWEEN (MAX.-MIN.) (C) 7.5 9.3 10.0 8.5 11.6 11.8 12.1 12.9 12.9 10.7 8.5 6.8 10.2 MEAN DAILY TEMP. (MDT) (C) 4.4 7.5 11.6 13.8 20.5 26.4 29.3 28.7 26.3 21.3 12.2 5.6 17.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 1.2 33.2 161.9 258.0 238.1 159.9 47.9 0.0 0.0 900.2 HEATING DEG. DAYS(BASE 18 0C) 420.4 293.6 199.5 134.4 8.7 0.0 0.0 0.0 0.0 8.6 172.7 385.5 1623.4 DEWPOINT (MEAN C) -2.1 -2.8 -1.7 4.1 2.1 -0.5 3.4 1.6 -1.8 0.9 1.4 0.3 0.4 MIXING RATIO (G/KG) 4.00 3.81 4.23 6.17 5.30 4.41 5.87 5.12 4.01 4.88 5.23 4.70 4.81 VAPOUR PRESSURE (HPA) 5.52 5.27 5.82 8.45 7.27 6.05 8.02 7.00 5.53 6.74 7.21 6.48 6.61 SATURATION DEF. (HPA) 2.76 5.23 8.36 7.86 18.37 30.27 34.90 34.08 29.79 19.06 6.94 2.68 16.69 RELATIVE HUMIDITY (MEAN %) 68 54 45 57 31 18 20 19 17 30 54 73 41 RELATIVE HUMIDITY (MAX. %) 84 71 61 74 45 26 30 28 25 41 70 86 53 RELATIVE HUMIDITY (MIN. %) 51 36 30 41 20 11 13 11 9 18 37 57 28 RELATIVE HUMIDITY (MEAN% 03UTC) 73 61 52 64 39 24 29 24 20 35 59 78 47 RELATIVE HUMIDITY (MEAN% 09UTC) 57 39 34 45 23 12 15 12 10 21 40 61 31 RELATIVE HUMIDITY (MEAN% 15UTC) 73 54 42 52 26 13 15 14 14 28 55 75 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 173.4 78.6 143.4 119.0 3.7 0.0 0.0 0.0 0.0 30.0 93.7 135.3 777.1 DAYS WITH PRECIPITATION >=10 7 3 5 3 0 0 0 0 0 1 4 5 28 DAYS WITH PRECIPITATION >= 5 8 4 5 6 0 0 0 0 0 2 4 6 35 DAYS WITH PRECIPITATION >= 1 12 5 7 17 2 0 0 0 0 3 5 12 63 DAYS WITH PRECIPITATION 15 7 8 18 4 0 0 0 0 5 7 14 78 GREATEST DAILY PRECIPITATION 37.0 30.0 55.0 37.0 2.4 0.0 0.0 0.0 0.0 15.7 35.0 55.0 55.0 DAY 23 13 17 19 3 ** ** ** ** 31 1 21 DAY WITH THUNDER STORM 4 2 3 9 2 0 0 0 0 2 5 4 31 DAYS WITH SNOW OR SLEET 6 2 2 0 0 0 0 0 0 0 0 5 15 DAYS WITH DUST 0 0 0 1 1 0 0 3 1 2 0 0 8 WIND DIRECTION (PREVAILING) 180 180 180 180 270 270 270 270 270 270 180 180 270 PREVAILING WIND SPEED(KNOTS) 8.9 8.9 11.2 9.9 8.8 10.5 9.5 10.0 9.3 7.7 7.5 8.9 8.8 PREVAILING WIND PERCENT 16.9 15.6 19.0 13.3 21.0 17.5 19.0 21.8 16.7 12.9 12.1 19.0 12.6 CALMS PERCENT OF WIND 63.7 49.6 41.9 47.1 44.0 36.3 50.4 42.3 52.9 56.0 55.4 56.9 49.7 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 180 173 168 184 252 282 300 296 313 220 145 170 232 VECTOR WIND MAGNITUDE(KNOTS) 1.9 1.4 3.0 1.9 2.1 2.2 3.0 3.3 2.3 1.1 1.3 2.4 1.1 WIND STEADINESES (MEAN %) 63.3 30.4 56.6 43.2 44.7 33.8 63.8 58.9 51.1 34.4 39.4 68.6 25.0 WIND SPEED (MEAN KNOTS) 3.0 4.6 5.3 4.4 4.7 6.5 4.7 5.6 4.5 3.2 3.3 3.5 4.4 FASTEST WIND DIRECTION 180 150 160 190 280 180 320 360 280 320 170 180 150 FASTEST WIND SPEED (KNOTS) 31 39 31 27 31 33 23 21 31 25 33 31 39 DAY 7 11 14 25 2 5 12 4 24 7 30 20 DAYS WITH SKY CLEAR (0-2)/8 14 15 14 6 24 29 31 31 29 19 16 5 233 DAYS WITH P.CLOUDY (3-6)/8 4 8 11 11 4 1 0 0 1 8 9 12 69 DAYS WITH CLOUDY (7-8)/8 13 5 6 13 3 0 0 0 0 4 5 14 63 DAYS WITH VISIBILITY =< 2 KM 8 4 2 0 0 1 0 0 0 0 1 7 23 DURATION OF SUNSHINE HOURS 156.8 198.7 242.1 183.8 330.7 367.1 376.2 358.4 310.3 248.7 215.1 125.9 3113.8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.2 865.9 863.5 861.8 861.7 859.4 858.9 858.8 863.8 866.3 866.7 864.9 863.1 MAX. QFE PRESSURE IN HPA 872.1 873.5 872.3 867.7 866.0 864.1 861.1 864.2 868.2 870.5 871.2 871.9 873.5 DAY-HOUR 25- 9 2- 3 11- 6 1- 6 17- 9 7- 9 3-18 29-18 21- 9 10- 6 18- 6 29-18 MIN. QFE PRESSURE IN HPA 857.0 856.6 856.7 854.9 858.0 855.9 854.2 854.6 860.1 862.0 860.5 854.1 854.1 DAY-HOUR 11-15 13-15 18- 0 3- 3 3- 0 19- 0 24- 0 14-12 18-12 21-15 12-12 21- 9 MEAN QNH PRESSURE IN HPA 1016.0 1016.8 1014.0 1012.1 1011.9 1009.4 1008.7 1008.6 1014.4 1017.2 1017.6 1015.6 1013.5 MAX. QNH PRESSURE IN HPA 1023.8 1025.4 1024.0 1018.8 1016.8 1014.7 1011.3 1014.8 1019.3 1022.0 1022.8 1023.6 1025.4 DAY-HOUR 25- 9 2- 3 11- 6 1- 6 17- 9 7- 9 3-18 29-18 21- 9 10- 6 18- 6 29-18 MIN. QNH PRESSURE IN HPA 1006.6 1006.1 1006.2 1004.2 1007.7 1005.3 1003.4 1003.8 1010.1 1012.3 1010.6 1003.3 1003.3 DAY-HOUR 11-15 13-15 18- 0 3- 3 3- 0 19- 0 24- 0 14-12 18-12 21-15 12-12 21- 9 MEAN QFF PRESSURE IN HPA 1017.1 1016.1 1010.8 1007.5 1003.6 998.1 995.8 996.2 1003.4 1008.9 1014.3 1015.9 1007.3 MAX. QFF PRESSURE IN HPA 1027.0 1027.3 1020.1 1015.4 1009.9 1005.6 999.5 1003.4 1008.2 1013.7 1021.2 1027.1 1027.3 DAY-HOUR 25- 6 2- 3 12- 6 1- 6 16-21 7- 3 1- 3 29-18 21- 6 26-15 29- 6 14- 3 MIN. QFF PRESSURE IN HPA 1006.0 1004.0 1000.2 1000.7 997.9 993.1 989.6 989.7 998.7 1003.8 1004.3 1002.6 989.6 DAY-HOUR 7-12 13-15 26-21 3- 3 24- 0 17- 0 24- 0 14-12 18-12 13-12 12-12 21- 3 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 865.2 865.9 863.3 861.6 861.1 859.1 858.6 858.5 863.4 866.0 866.5 864.9 862.8 MAX. QFE PRESSURE IN HPA 870.7 872.7 871.7 866.7 864.7 863.1 860.4 863.0 866.7 870.1 870.5 871.1 872.7 DAY 26 2 12 1 17 7 1 30 21 11 19 30 MIN. QFE PRESSURE IN HPA 859.6 858.5 856.7 856.3 858.0 855.9 854.2 855.1 860.3 863.1 861.4 854.9 854.2 DAY 12 25 18 3 3 19 24 15 10 30 13 21 MEAN QNH PRESSURE IN HPA 1015.9 1016.7 1013.8 1011.8 1011.3 1008.9 1008.4 1008.2 1013.9 1016.9 1017.4 1015.6 1013.2 MAX. QNH PRESSURE IN HPA 1022.2 1024.5 1023.3 1017.6 1015.4 1013.5 1010.5 1013.4 1017.6 1021.5 1022.0 1022.6 1024.5 DAY 26 2 12 1 17 7 1 30 21 11 19 30 MIN. QNH PRESSURE IN HPA 1009.5 1008.3 1006.2 1005.8 1007.7 1005.3 1003.4 1004.4 1010.3 1013.5 1011.6 1004.2 1003.4 DAY 12 25 18 3 3 19 24 15 10 30 13 21 MEAN QFF PRESSURE IN HPA 1016.7 1015.8 1010.3 1007.1 1003.0 997.5 995.6 995.6 1002.8 1008.2 1013.6 1015.7 1006.8 MAX. QFF PRESSURE IN HPA 1024.7 1025.8 1018.6 1015.3 1008.8 1004.1 999.3 1002.3 1006.4 1012.2 1018.7 1026.2 1026.2 DAY 25 2 12 1 17 7 1 30 21 27 29 14 MIN. QFF PRESSURE IN HPA 1009.9 1004.7 1000.4 1001.5 997.9 993.1 989.6 990.5 999.6 1004.3 1006.7 1003.4 989.6 DAY 8 25 27 3 24 17 24 14 4 14 13 21 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 865.0 865.9 863.4 861.5 861.3 859.2 858.7 858.5 863.6 866.1 866.6 864.7 862.9 MAX. QFE PRESSURE IN HPA 870.5 873.5 871.4 866.0 864.9 863.6 860.9 863.0 867.3 869.6 870.2 870.5 873.5 DAY 26 2 11 1 17 7 19 30 21 10 18 30 MIN. QFE PRESSURE IN HPA 860.1 858.5 856.8 854.9 858.0 855.9 854.7 854.8 860.5 862.5 861.6 854.3 854.3 DAY 23 25 18 3 4 19 24 14 10 21 13 21 MEAN QNH PRESSURE IN HPA 1015.7 1016.8 1013.8 1011.7 1011.5 1009.0 1008.5 1008.3 1014.1 1017.0 1017.5 1015.3 1013.3 MAX. QNH PRESSURE IN HPA 1022.0 1025.4 1023.0 1016.8 1015.6 1014.1 1011.0 1013.4 1018.3 1020.9 1021.6 1022.0 1025.4 DAY 26 2 11 1 17 7 19 30 21 10 18 30 MIN. QNH PRESSURE IN HPA 1010.1 1008.3 1006.4 1004.2 1007.7 1005.3 1004.0 1004.1 1010.6 1012.8 1011.8 1003.5 1003.5 DAY 23 25 18 3 4 19 24 14 10 21 13 21 MEAN QFF PRESSURE IN HPA 1017.4 1016.7 1011.0 1007.5 1003.6 998.0 996.1 996.3 1003.5 1009.2 1014.7 1016.1 1007.5 MAX. QFF PRESSURE IN HPA 1026.6 1027.3 1019.8 1014.7 1008.9 1005.6 999.5 1002.1 1007.8 1013.3 1019.9 1027.1 1027.3 DAY 25 2 11 1 17 7 1 30 21 26 29 14 MIN. QFF PRESSURE IN HPA 1008.1 1006.1 1001.2 1000.7 999.0 993.9 990.9 990.5 1000.3 1005.3 1008.1 1002.6 990.5 DAY 7 25 27 3 24 19 22 14 4 13 13 21 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.7 866.6 864.1 862.2 862.1 859.8 859.2 859.0 864.4 867.1 867.5 865.7 863.6 MAX. QFE PRESSURE IN HPA 871.6 873.5 872.3 867.7 865.6 863.6 861.1 863.8 867.9 870.5 871.2 871.6 873.5 DAY 25 2 11 1 17 7 19 30 21 10 18 30 MIN. QFE PRESSURE IN HPA 859.9 859.7 857.2 855.5 858.4 856.2 855.0 855.3 861.3 862.9 862.0 854.9 854.9 DAY 11 25 18 3 4 21 24 14 10 21 25 21 MEAN QNH PRESSURE IN HPA 1016.5 1017.6 1014.6 1012.5 1012.4 1009.8 1009.1 1008.9 1015.0 1018.0 1018.5 1016.4 1014.1 MAX. QNH PRESSURE IN HPA 1023.2 1025.4 1024.0 1018.8 1016.4 1014.1 1011.3 1014.3 1019.0 1022.0 1022.8 1023.2 1025.4 DAY 25 2 11 1 17 7 19 30 21 10 18 30 MIN. QNH PRESSURE IN HPA 1009.9 1009.7 1006.8 1004.9 1008.2 1005.7 1004.3 1004.6 1011.5 1013.3 1012.3 1004.2 1004.2 DAY 11 25 18 3 4 21 24 14 10 21 25 21 MEAN QFF PRESSURE IN HPA 1017.9 1017.2 1011.6 1007.9 1004.0 998.4 996.0 996.3 1004.0 1009.7 1015.4 1017.0 1008.0 MAX. QFF PRESSURE IN HPA 1027.0 1026.4 1020.1 1015.4 1009.1 1005.1 998.9 1002.8 1008.2 1013.7 1021.2 1027.0 1027.0 DAY 25 2 12 1 17 7 26 30 21 26 29 14 MIN. QFF PRESSURE IN HPA 1008.5 1006.8 1002.9 1002.1 999.4 994.1 991.1 990.2 1000.8 1005.8 1008.6 1003.4 990.2 DAY 7 25 27 3 19 17 24 14 7 13 13 21 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.3 866.4 864.0 862.2 862.3 860.0 859.1 859.0 864.2 866.7 867.0 865.0 863.4 MAX. QFE PRESSURE IN HPA 872.1 873.5 872.0 866.5 866.0 864.1 861.1 863.5 868.2 870.1 871.0 870.8 873.5 DAY 25 6 11 1 17 7 31 30 21 10 18 29 MIN. QFE PRESSURE IN HPA 859.3 860.1 856.9 855.7 859.1 856.5 855.7 854.9 861.0 862.5 861.7 854.1 854.1 DAY 11 25 28 3 3 21 24 14 10 21 25 21 MEAN QNH PRESSURE IN HPA 1016.1 1017.3 1014.6 1012.5 1012.6 1010.0 1009.0 1008.8 1014.7 1017.6 1017.9 1015.7 1013.9 MAX. QNH PRESSURE IN HPA 1023.8 1025.4 1023.7 1017.4 1016.8 1014.7 1011.3 1014.0 1019.3 1021.5 1022.5 1022.3 1025.4 DAY 25 6 11 1 17 7 31 30 21 10 18 29 MIN. QNH PRESSURE IN HPA 1009.2 1010.1 1006.5 1005.1 1009.0 1006.0 1005.1 1004.2 1011.1 1012.8 1011.9 1003.3 1003.3 DAY 11 25 28 3 3 21 24 14 10 21 25 21 MEAN QFF PRESSURE IN HPA 1016.9 1016.1 1010.9 1007.6 1004.1 998.6 995.9 996.2 1003.6 1008.9 1014.3 1015.7 1007.4 MAX. QFF PRESSURE IN HPA 1026.5 1026.1 1018.2 1013.8 1009.7 1005.5 998.7 1002.7 1008.2 1013.5 1019.8 1025.4 1026.5 DAY 25 1 11 6 17 7 26 30 21 26 29 14 MIN. QFF PRESSURE IN HPA 1007.0 1006.4 1002.1 1002.5 999.7 993.9 991.3 989.9 1000.3 1004.5 1008.1 1002.7 989.9 DAY 7 25 28 12 19 18 22 14 7 13 12 21 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 864.6 865.2 863.0 861.7 861.7 859.4 858.6 858.5 863.4 865.8 866.0 864.4 862.7 MAX. QFE PRESSURE IN HPA 870.6 872.2 870.9 865.4 865.4 863.6 860.6 862.8 867.0 869.1 870.3 870.3 872.2 DAY 25 1 11 6 17 7 5 29 21 10 18 29 MIN. QFE PRESSURE IN HPA 858.3 858.2 856.8 855.6 859.0 856.4 854.9 854.6 860.1 862.1 860.5 854.2 854.2 DAY 21 13 18 3 2 19 23 14 18 21 12 21 MEAN QNH PRESSURE IN HPA 1015.2 1016.0 1013.4 1012.0 1011.9 1009.3 1008.4 1008.2 1013.9 1016.6 1016.9 1015.0 1013.1 MAX. QNH PRESSURE IN HPA 1022.1 1023.9 1022.4 1016.1 1016.1 1014.1 1010.7 1013.2 1018.0 1020.4 1021.7 1021.7 1023.9 DAY 25 1 11 6 17 7 5 29 21 10 18 29 MIN. QNH PRESSURE IN HPA 1008.1 1007.9 1006.4 1005.0 1008.9 1005.9 1004.2 1003.8 1010.1 1012.4 1010.6 1003.4 1003.4 DAY 21 13 18 3 2 19 23 14 18 21 12 21 MEAN QFF PRESSURE IN HPA 1016.0 1014.9 1010.0 1007.2 1003.6 997.9 995.6 995.7 1002.8 1008.1 1013.2 1015.1 1006.7 MAX. QFF PRESSURE IN HPA 1025.2 1025.6 1017.3 1012.6 1008.6 1004.8 998.6 1002.3 1006.3 1013.0 1018.6 1024.0 1025.6 DAY 24 1 11 6 17 7 5 30 20 26 29 14 MIN. QFF PRESSURE IN HPA 1006.0 1005.9 1001.8 1001.9 999.9 993.2 990.1 989.7 998.7 1003.8 1004.3 1003.4 989.7 DAY 7 13 26 12 19 18 23 14 18 13 12 21 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 864.9 865.4 863.0 861.5 861.3 859.0 858.3 858.4 863.5 866.0 866.4 864.6 862.7 MAX. QFE PRESSURE IN HPA 870.9 872.3 871.5 865.3 864.9 863.1 860.1 863.0 866.8 869.1 870.1 871.3 872.3 DAY 26 1 11 15 17 7 17 29 23 10 18 29 MIN. QFE PRESSURE IN HPA 857.0 856.6 856.8 855.9 859.3 856.0 854.4 854.7 860.4 862.0 861.3 855.6 854.4 DAY 11 13 18 3 2 19 23 14 18 21 25 21 MEAN QNH PRESSURE IN HPA 1015.6 1016.2 1013.4 1011.8 1011.5 1008.9 1008.1 1008.2 1014.0 1016.8 1017.3 1015.3 1013.1 MAX. QNH PRESSURE IN HPA 1022.4 1024.0 1023.1 1016.0 1015.6 1013.5 1010.1 1013.4 1017.7 1020.4 1021.5 1022.9 1024.0 DAY 26 1 11 15 17 7 17 29 23 10 18 29 MIN. QNH PRESSURE IN HPA 1006.6 1006.1 1006.4 1005.3 1009.2 1005.4 1003.6 1004.0 1010.5 1012.3 1011.5 1005.0 1003.6 DAY 11 13 18 3 2 19 23 14 18 21 25 21 MEAN QFF PRESSURE IN HPA 1017.2 1015.9 1010.6 1007.5 1003.5 997.9 995.7 996.3 1003.4 1009.2 1014.3 1016.0 1007.3 MAX. QFF PRESSURE IN HPA 1026.3 1025.6 1019.8 1013.0 1008.3 1004.6 998.4 1003.2 1007.3 1013.7 1019.3 1024.9 1026.3 DAY 24 1 11 23 16 7 5 29 20 26 29 14 MIN. QFF PRESSURE IN HPA 1007.2 1004.0 1002.5 1002.0 998.8 993.6 990.0 990.6 999.7 1005.1 1006.5 1006.2 990.0 DAY 7 13 26 2 28 18 23 14 18 13 12 20 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 865.7 866.1 863.9 862.1 862.0 859.7 859.3 859.4 864.3 866.6 866.8 865.1 863.4 MAX. QFE PRESSURE IN HPA 871.6 873.1 871.7 866.5 865.3 863.5 861.1 864.2 867.8 870.0 870.6 871.9 873.1 DAY 26 1 11 23 16 6 3 29 23 10 18 29 MIN. QFE PRESSURE IN HPA 858.5 859.6 857.1 857.1 859.4 856.7 855.0 855.9 861.1 863.0 862.6 856.7 855.0 DAY 11 13 17 3 2 19 23 13 10 21 25 21 MEAN QNH PRESSURE IN HPA 1016.5 1017.0 1014.4 1012.3 1012.3 1009.6 1009.2 1009.3 1014.9 1017.5 1017.8 1015.8 1013.9 MAX. QNH PRESSURE IN HPA 1023.2 1024.9 1023.3 1017.4 1016.0 1014.0 1011.3 1014.8 1018.9 1021.4 1022.1 1023.6 1024.9 DAY 26 1 11 23 16 6 3 29 23 10 18 29 MIN. QNH PRESSURE IN HPA 1008.3 1009.5 1006.7 1006.7 1009.3 1006.2 1004.3 1005.3 1011.3 1013.4 1013.0 1006.2 1004.3 DAY 11 13 17 3 2 19 23 13 10 21 25 21 MEAN QFF PRESSURE IN HPA 1018.0 1016.5 1011.3 1007.7 1003.7 998.2 996.2 996.8 1003.9 1009.3 1014.6 1016.4 1007.7 MAX. QFF PRESSURE IN HPA 1026.8 1026.6 1019.8 1014.3 1009.9 1004.8 998.7 1003.4 1007.5 1013.5 1019.2 1024.2 1026.8 DAY 24 1 11 5 16 3 5 29 20 26 29 29 MIN. QFF PRESSURE IN HPA 1009.4 1007.5 1001.4 1002.5 999.2 994.3 990.2 991.3 1000.8 1005.1 1008.5 1006.3 990.2 DAY 7 24 26 2 28 18 23 13 18 13 12 20 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 865.6 866.0 863.8 862.1 861.9 859.6 859.2 859.3 864.1 866.4 866.9 865.1 863.3 MAX. QFE PRESSURE IN HPA 871.6 873.1 871.7 867.1 865.4 863.8 861.0 863.7 867.6 869.9 870.7 871.5 873.1 DAY 26 1 11 15 16 6 18 29 23 7 18 29 MIN. QFE PRESSURE IN HPA 858.9 859.4 857.1 857.0 858.7 856.5 855.0 855.9 860.6 862.8 862.4 855.3 855.0 DAY 11 24 17 2 3 19 23 13 9 29 12 20 MEAN QNH PRESSURE IN HPA 1016.4 1016.9 1014.3 1012.4 1012.2 1009.6 1009.1 1009.2 1014.6 1017.3 1017.9 1015.8 1013.8 MAX. QNH PRESSURE IN HPA 1023.2 1024.9 1023.3 1018.1 1016.1 1014.3 1011.1 1014.2 1018.7 1021.3 1022.2 1023.1 1024.9 DAY 26 1 11 15 16 6 18 29 23 7 18 29 MIN. QNH PRESSURE IN HPA 1008.7 1009.3 1006.7 1006.6 1008.5 1006.0 1004.3 1005.3 1010.7 1013.2 1012.7 1004.6 1004.3 DAY 11 24 17 2 3 19 23 13 9 29 12 20 MEAN QFF PRESSURE IN HPA 1017.3 1015.6 1010.6 1007.4 1003.6 998.1 995.9 996.5 1003.4 1008.6 1014.2 1015.8 1007.3 MAX. QFF PRESSURE IN HPA 1026.3 1026.0 1018.4 1014.2 1009.9 1004.9 998.6 1002.6 1007.2 1012.2 1018.6 1025.7 1026.3 DAY 24 1 11 5 16 6 5 29 20 26 29 13 MIN. QFF PRESSURE IN HPA 1009.9 1005.1 1000.2 1001.8 999.2 993.9 990.2 990.9 1000.1 1003.9 1008.0 1004.0 990.2 DAY 11 24 26 2 28 18 23 13 3 13 12 20 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 2003 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.6 4.8 8.0 15.1 20.5 25.9 28.0 29.6 23.9 19.5 10.4 5.5 16.3 MINIMUN AIR TEMPERATURE (C) 0.4 0.8 3.1 9.2 13.2 17.3 19.4 20.9 15.7 12.9 5.6 1.6 10.0 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 1 3 13 0 1 0 0 18 DAYS WITH MINIMUM TEMP. <=-4 0 1 1 0 0 0 0 0 0 0 0 1 3 DAYS WITH FREEZING MIN.<= 0 17 11 5 0 0 0 0 0 0 0 1 14 48 TEMPERATURE RECORDS LOWEST(C) -3.6 -4.2 -5.2 3.6 4.2 12.4 16.8 17.0 11.0 6.4 0.0 -4.4 -5.2 DAY 20 28 1 2 9 5 9 1 14 31 22 21 MAXIMUM AIR TEMPERATURE (C) 10.0 9.5 13.2 20.9 27.1 32.6 35.1 37.1 31.9 26.6 16.6 10.8 22.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 3 24 31 31 26 2 0 0 117 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 16.8 15.0 19.2 26.8 30.8 35.8 38.2 40.6 36.8 30.4 23.6 15.2 40.6 DAY 8 8 25 5 21 25 11 12 4 7 6 26 DIF. BETWEEN (MAX.-MIN.) (C) 9.6 8.7 10.1 11.7 13.9 15.3 15.7 16.2 16.2 13.7 11.0 9.2 12.6 MEAN DAILY TEMP. (MDT) (C) 5.2 5.1 8.2 15.0 20.1 24.9 27.2 29.0 23.8 19.8 11.1 6.2 16.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 2.3 18.2 121.2 193.6 247.9 85.1 9.0 0.0 0.0 677.3 HEATING DEG. DAYS(BASE 18 0C) 395.8 360.2 304.9 102.7 8.7 0.0 0.0 0.0 0.0 10.0 207.4 365.0 1754.7 DEWPOINT (MEAN C) -2.1 -2.3 -1.3 1.8 -0.4 -0.6 1.8 1.5 -0.6 2.1 0.3 -0.0 0.0 MIXING RATIO (G/KG) 3.90 3.86 4.17 5.22 4.56 4.38 5.13 5.01 4.37 5.35 4.83 4.59 4.61 VAPOUR PRESSURE (HPA) 5.41 5.34 5.77 7.21 6.31 6.04 7.04 6.90 6.05 7.41 6.70 6.38 6.38 SATURATION DEF. (HPA) 3.38 3.51 5.42 10.81 18.87 28.86 32.38 36.49 25.23 16.26 6.50 2.96 15.89 RELATIVE HUMIDITY (MEAN %) 67 64 56 45 28 20 20 18 22 35 55 71 42 RELATIVE HUMIDITY (MAX. %) 83 84 78 67 43 31 30 26 36 49 72 86 57 RELATIVE HUMIDITY (MIN. %) 45 41 36 25 16 11 11 11 12 22 36 50 26 RELATIVE HUMIDITY (MEAN% 03UTC) 74 71 68 58 38 29 28 24 29 45 64 79 51 RELATIVE HUMIDITY (MEAN% 09UTC) 50 49 39 32 18 12 13 12 13 24 39 55 30 RELATIVE HUMIDITY (MEAN% 15UTC) 66 62 49 36 20 14 14 13 17 30 52 71 37 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 105.1 83.9 91.0 11.7 7.1 0.0 0.0 0.0 0.0 15.2 128.9 146.0 588.9 DAYS WITH PRECIPITATION >=10 6 3 4 0 0 0 0 0 0 1 3 6 23 DAYS WITH PRECIPITATION >= 5 7 6 5 0 0 0 0 0 0 1 4 7 30 DAYS WITH PRECIPITATION >= 1 9 9 6 4 2 0 0 0 0 3 7 9 49 DAYS WITH PRECIPITATION 10 15 9 13 4 1 0 0 0 5 9 12 78 GREATEST DAILY PRECIPITATION 27.7 24.2 36.4 4.2 4.3 0.0 0.0 0.0 0.0 12.0 48.0 47.0 48.0 DAY 28 25 26 27 30 ** ** ** ** 30 11 6 DAY WITH THUNDER STORM 3 6 4 8 2 1 0 0 0 3 4 5 36 DAYS WITH SNOW OR SLEET 5 3 2 0 0 0 0 0 0 0 0 1 11 DAYS WITH DUST 0 4 8 5 4 5 0 0 0 1 0 0 27 WIND DIRECTION (PREVAILING) 135 135 135 180 135 315 270 315 135 135 135 135 135 PREVAILING WIND SPEED(KNOTS) 7.8 8.5 9.3 13.0 5.9 9.1 10.6 9.0 4.8 5.9 5.8 6.5 6.9 PREVAILING WIND PERCENT 36.3 34.8 38.3 25.0 23.0 21.3 28.6 19.0 20.8 25.0 37.5 33.5 25.5 CALMS PERCENT OF WIND 27.0 22.8 14.9 22.1 20.6 20.8 18.1 19.0 17.9 21.8 16.3 25.0 20.5 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 154 164 168 177 232 292 289 305 287 178 151 145 186 VECTOR WIND MAGNITUDE(KNOTS) 4.5 4.8 6.0 4.3 1.6 2.4 4.0 1.9 1.8 2.0 2.4 3.7 1.9 WIND STEADINESES (MEAN %) 75.0 66.7 69.0 55.8 23.9 38.1 59.7 30.6 32.1 39.2 48.0 78.7 30.2 WIND SPEED (MEAN KNOTS) 6.0 7.2 8.7 7.7 6.7 6.3 6.7 6.2 5.6 5.1 5.0 4.7 6.3 FASTEST WIND DIRECTION 150 140 150 180 360 280 300 320 290 240 140 160 180 FASTEST WIND SPEED (KNOTS) 23 33 33 43 25 23 17 17 16 23 21 23 43 DAY 14 3 6 26 30 7 19 12 1 27 10 11 DAYS WITH SKY CLEAR (0-2)/8 14 11 10 6 13 26 31 31 30 20 13 12 217 DAYS WITH P.CLOUDY (3-6)/8 9 11 12 15 13 4 0 0 0 8 10 10 92 DAYS WITH CLOUDY (7-8)/8 8 6 9 9 5 0 0 0 0 3 7 9 56 DAYS WITH VISIBILITY =< 2 KM 2 5 3 2 0 1 0 0 0 0 1 5 19 DURATION OF SUNSHINE HOURS 187.3 153.4 210.0 211.3 292.0 345.4 389.9 377.1 332.0 251.7 192.2 163.7 3106.0 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 869.9 866.8 866.7 867.3 867.6 863.2 860.8 863.5 866.7 870.2 871.3 871.2 867.1 MAX. QFE PRESSURE IN HPA 877.6 874.4 874.5 873.6 872.0 869.9 866.2 866.3 871.0 875.0 877.3 877.0 877.6 DAY-HOUR 7- 6 6- 6 2- 6 7-18 11- 6 4- 9 3- 3 29- 9 27- 6 15- 6 25-18 30- 6 MIN. QFE PRESSURE IN HPA 856.7 857.1 856.0 859.2 861.6 857.2 857.2 860.3 862.7 865.8 865.1 860.8 856.0 DAY-HOUR 28- 9 19- 3 26- 0 27-15 28-15 30-15 25-15 21- 0 7- 0 1-21 9-12 6- 0 MEAN QNH PRESSURE IN HPA 1021.2 1017.7 1017.6 1018.3 1018.6 1013.6 1010.9 1014.0 1017.6 1021.6 1022.8 1022.8 1018.1 MAX. QNH PRESSURE IN HPA 1030.0 1026.4 1026.5 1025.5 1023.7 1021.3 1017.1 1017.2 1022.5 1027.1 1029.7 1029.4 1030.0 DAY-HOUR 7- 6 6- 6 2- 6 7-18 11- 6 4- 9 3- 3 29- 9 27- 6 15- 6 25-18 30- 6 MIN. QNH PRESSURE IN HPA 1006.2 1006.7 1005.4 1009.1 1011.8 1006.8 1006.8 1010.3 1013.1 1016.6 1015.8 1010.9 1005.4 DAY-HOUR 28- 9 19- 3 26- 0 27-15 28-15 30-15 25-15 21- 0 7- 0 1-21 9-12 6- 0 MEAN QFF PRESSURE IN HPA 1022.2 1018.4 1016.5 1013.2 1010.7 1002.9 999.0 1001.4 1007.9 1014.2 1020.4 1023.1 1012.5 MAX. QFF PRESSURE IN HPA 1031.4 1029.3 1029.6 1021.3 1017.5 1013.0 1006.6 1006.5 1013.5 1021.9 1028.1 1032.2 1032.2 DAY-HOUR 7-18 6- 6 2- 6 30- 9 1- 6 4- 9 3- 3 29- 3 27- 6 31-18 22- 6 30- 6 MIN. QFF PRESSURE IN HPA 1005.4 1006.1 1001.1 1002.8 1002.8 995.2 994.4 997.5 1000.7 1006.5 1010.3 1009.5 994.4 DAY-HOUR 28- 9 19-12 26- 0 20-15 29- 0 30- 6 7-12 21- 0 4-12 3- 0 9-12 6- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 869.8 866.7 866.4 866.9 867.3 863.1 860.5 863.2 866.4 869.9 871.1 871.1 866.9 MAX. QFE PRESSURE IN HPA 876.8 873.0 872.6 871.9 870.8 869.0 865.7 865.6 870.0 873.8 875.9 875.8 876.8 DAY 7 6 2 3 11 4 3 30 27 15 26 22 MIN. QFE PRESSURE IN HPA 860.5 857.5 856.0 861.9 861.6 859.0 857.4 860.3 862.7 866.2 866.8 860.8 856.0 DAY 28 19 26 20 29 21 26 21 7 2 9 6 MEAN QNH PRESSURE IN HPA 1021.2 1017.6 1017.3 1017.8 1018.3 1013.5 1010.6 1013.6 1017.3 1021.2 1022.7 1022.6 1017.8 MAX. QNH PRESSURE IN HPA 1029.1 1024.8 1024.3 1023.6 1022.3 1020.3 1016.5 1016.4 1021.4 1025.7 1028.1 1028.0 1029.1 DAY 7 6 2 3 11 4 3 30 27 15 26 22 MIN. QNH PRESSURE IN HPA 1010.6 1007.2 1005.4 1012.2 1011.8 1008.9 1007.0 1010.3 1013.1 1017.1 1017.7 1010.9 1005.4 DAY 28 19 26 20 29 21 26 21 7 2 9 6 MEAN QFF PRESSURE IN HPA 1021.6 1017.9 1015.9 1012.5 1010.5 1002.8 998.7 1001.0 1007.4 1013.5 1019.7 1022.7 1012.0 MAX. QFF PRESSURE IN HPA 1029.2 1026.2 1026.7 1020.2 1017.5 1011.8 1005.8 1005.3 1012.0 1019.1 1026.1 1030.6 1030.6 DAY 7 6 2 30 1 5 3 30 20 31 22 22 MIN. QFF PRESSURE IN HPA 1009.5 1007.2 1001.1 1004.8 1002.8 997.0 995.3 997.5 1001.0 1006.5 1011.0 1009.5 995.3 DAY 28 20 26 20 29 14 26 21 5 3 9 6 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 869.6 866.4 866.4 866.9 867.4 863.1 860.6 863.5 866.4 870.1 871.2 870.9 866.9 MAX. QFE PRESSURE IN HPA 876.6 873.4 873.1 871.8 871.5 868.8 866.2 865.6 870.3 874.3 876.4 875.4 876.6 DAY 7 6 2 30 11 4 3 29 27 15 26 30 MIN. QFE PRESSURE IN HPA 859.1 857.1 856.3 861.2 862.0 858.1 857.6 860.6 862.9 866.7 866.9 861.1 856.3 DAY 28 19 26 20 29 30 25 21 5 29 29 6 MEAN QNH PRESSURE IN HPA 1020.9 1017.3 1017.3 1017.8 1018.5 1013.6 1010.6 1013.9 1017.3 1021.5 1022.8 1022.4 1017.8 MAX. QNH PRESSURE IN HPA 1028.9 1025.3 1024.9 1023.4 1023.1 1020.0 1017.1 1016.4 1021.7 1026.3 1028.7 1027.5 1028.9 DAY 7 6 2 30 11 4 3 29 27 15 26 30 MIN. QNH PRESSURE IN HPA 1009.0 1006.7 1005.8 1011.4 1012.3 1007.8 1007.3 1010.7 1013.3 1017.6 1017.9 1011.3 1005.8 DAY 28 19 26 20 29 30 25 21 5 29 29 6 MEAN QFF PRESSURE IN HPA 1022.5 1018.4 1016.7 1013.2 1011.0 1003.4 999.4 1001.9 1008.4 1014.7 1021.1 1023.3 1012.8 MAX. QFF PRESSURE IN HPA 1029.8 1028.4 1028.4 1020.5 1016.7 1012.0 1006.6 1006.5 1013.5 1019.4 1027.8 1030.7 1030.7 DAY 7 6 2 30 11 2 3 29 27 31 22 30 MIN. QFF PRESSURE IN HPA 1008.7 1008.2 1003.6 1004.3 1004.1 996.7 996.4 998.9 1001.8 1007.9 1013.7 1010.3 996.4 DAY 28 19 26 20 29 30 26 21 5 3 9 6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 870.5 867.5 867.4 867.8 868.1 863.5 860.9 864.0 867.1 871.0 871.9 871.9 867.6 MAX. QFE PRESSURE IN HPA 877.6 874.4 874.5 873.0 872.0 869.7 866.2 866.0 871.0 875.0 877.1 877.0 877.6 DAY 7 6 2 8 11 4 3 12 27 15 25 30 MIN. QFE PRESSURE IN HPA 857.6 857.5 858.9 861.6 862.9 857.8 857.9 861.0 863.3 867.7 867.1 861.7 857.5 DAY 28 19 26 27 29 30 25 20 7 29 9 6 MEAN QNH PRESSURE IN HPA 1021.9 1018.5 1018.4 1018.9 1019.2 1014.0 1011.0 1014.5 1018.1 1022.5 1023.6 1023.6 1018.7 MAX. QNH PRESSURE IN HPA 1030.0 1026.4 1026.5 1024.8 1023.7 1021.0 1017.1 1016.8 1022.5 1027.1 1029.5 1029.4 1030.0 DAY 7 6 2 8 11 4 3 12 27 15 25 30 MIN. QNH PRESSURE IN HPA 1007.3 1007.2 1008.7 1011.8 1013.3 1007.5 1007.6 1011.1 1013.8 1018.8 1018.1 1011.9 1007.2 DAY 28 19 26 27 29 30 25 20 7 29 9 6 MEAN QFF PRESSURE IN HPA 1023.6 1019.6 1017.7 1013.8 1011.1 1003.0 998.7 1001.7 1008.3 1015.2 1021.7 1024.3 1013.2 MAX. QFF PRESSURE IN HPA 1031.0 1029.3 1029.6 1020.8 1017.5 1011.9 1005.2 1006.2 1013.5 1021.0 1028.1 1032.2 1032.2 DAY 7 6 2 30 1 4 3 29 27 31 22 30 MIN. QFF PRESSURE IN HPA 1006.6 1008.0 1007.2 1005.3 1004.7 995.2 995.2 998.8 1002.0 1010.0 1013.7 1011.0 995.2 DAY 28 19 19 27 29 30 7 20 4 1 9 6 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 870.1 867.3 867.3 867.9 868.1 863.5 860.9 863.9 866.9 870.5 871.5 871.4 867.5 MAX. QFE PRESSURE IN HPA 877.6 874.2 874.2 873.1 871.6 869.9 865.9 866.3 871.0 874.5 876.7 876.1 877.6 DAY 7 6 2 30 11 4 3 29 27 15 25 30 MIN. QFE PRESSURE IN HPA 856.7 858.0 859.3 861.3 863.7 857.7 857.7 861.2 863.3 867.3 865.8 862.9 856.7 DAY 28 19 26 20 28 30 25 20 7 1 9 6 MEAN QNH PRESSURE IN HPA 1021.6 1018.3 1018.3 1019.0 1019.2 1014.0 1011.1 1014.5 1017.9 1022.0 1023.1 1023.0 1018.5 MAX. QNH PRESSURE IN HPA 1030.0 1026.2 1026.2 1024.9 1023.2 1021.3 1016.7 1017.2 1022.5 1026.5 1029.0 1028.3 1030.0 DAY 7 6 2 30 11 4 3 29 27 15 25 30 MIN. QNH PRESSURE IN HPA 1006.2 1007.7 1009.2 1011.5 1014.2 1007.4 1007.4 1011.4 1013.8 1018.3 1016.6 1013.3 1006.2 DAY 28 19 26 20 28 30 25 20 7 1 9 6 MEAN QFF PRESSURE IN HPA 1022.0 1018.7 1016.8 1013.6 1011.2 1003.2 998.8 1001.5 1007.7 1013.9 1020.1 1022.9 1012.5 MAX. QFF PRESSURE IN HPA 1029.0 1027.6 1027.8 1021.3 1017.1 1013.0 1004.7 1006.1 1012.8 1020.3 1026.7 1029.7 1029.7 DAY 7 6 2 30 1 4 3 29 27 31 22 30 MIN. QFF PRESSURE IN HPA 1005.4 1006.9 1005.8 1005.0 1005.0 995.5 995.3 998.6 1001.3 1009.1 1011.0 1013.0 995.3 DAY 28 20 12 20 28 30 25 20 4 1 9 6 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 869.1 866.2 866.1 867.1 867.4 862.9 860.6 863.1 866.2 869.7 870.6 870.6 866.6 MAX. QFE PRESSURE IN HPA 876.4 873.0 872.8 872.3 870.8 868.9 864.9 865.1 870.3 873.3 876.0 874.9 876.4 DAY 7 6 2 30 10 4 3 5 27 15 25 30 MIN. QFE PRESSURE IN HPA 856.8 857.5 857.0 860.7 862.6 857.4 857.5 860.6 862.8 866.3 865.1 862.6 856.8 DAY 28 19 12 20 28 30 7 21 4 1 9 6 MEAN QNH PRESSURE IN HPA 1020.4 1017.1 1016.9 1018.1 1018.4 1013.3 1010.6 1013.6 1017.1 1021.0 1022.1 1022.0 1017.6 MAX. QNH PRESSURE IN HPA 1028.7 1024.8 1024.6 1024.0 1022.3 1020.1 1015.6 1015.8 1021.7 1025.1 1028.2 1027.0 1028.7 DAY 7 6 2 30 10 4 3 5 27 15 25 30 MIN. QNH PRESSURE IN HPA 1006.4 1007.2 1006.6 1010.8 1013.0 1007.0 1007.2 1010.7 1013.2 1017.2 1015.8 1013.0 1006.4 DAY 28 19 12 20 28 30 7 21 4 1 9 6 MEAN QFF PRESSURE IN HPA 1020.7 1017.4 1015.5 1012.8 1010.7 1002.5 998.8 1000.9 1007.3 1013.3 1019.2 1022.0 1011.8 MAX. QFF PRESSURE IN HPA 1027.9 1025.8 1025.9 1020.5 1016.0 1012.3 1004.1 1004.5 1012.3 1019.8 1025.9 1028.4 1028.4 DAY 7 6 1 30 10 2 2 29 27 31 22 29 MIN. QFF PRESSURE IN HPA 1006.1 1006.1 1002.8 1003.1 1004.1 995.4 994.4 998.2 1000.7 1007.9 1010.3 1012.8 994.4 DAY 28 19 12 20 28 30 7 21 4 1 9 6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 869.6 866.3 866.1 866.8 866.8 862.6 860.4 863.0 866.2 869.8 870.9 871.0 866.6 MAX. QFE PRESSURE IN HPA 876.9 873.2 873.2 871.8 870.5 868.5 864.3 865.1 870.0 873.4 876.6 875.6 876.9 DAY 7 6 2 30 10 2 3 29 27 15 25 29 MIN. QFE PRESSURE IN HPA 858.3 858.3 856.5 859.2 861.6 857.2 857.2 860.5 862.8 866.0 865.6 864.7 856.5 DAY 28 19 12 27 28 30 25 20 5 1 9 6 MEAN QNH PRESSURE IN HPA 1020.9 1017.2 1016.9 1017.8 1017.8 1012.9 1010.5 1013.4 1017.1 1021.1 1022.4 1022.5 1017.5 MAX. QNH PRESSURE IN HPA 1029.2 1025.0 1025.0 1023.4 1022.0 1019.7 1014.9 1015.8 1021.4 1025.3 1028.9 1027.8 1029.2 DAY 7 6 2 30 10 2 3 29 27 15 25 29 MIN. QNH PRESSURE IN HPA 1008.1 1008.1 1006.0 1009.1 1011.8 1006.8 1006.8 1010.6 1013.2 1016.8 1016.4 1015.4 1006.0 DAY 28 19 12 27 28 30 25 20 5 1 9 6 MEAN QFF PRESSURE IN HPA 1022.3 1018.3 1016.2 1013.1 1010.2 1002.7 999.2 1001.3 1008.2 1014.4 1020.8 1023.4 1012.5 MAX. QFF PRESSURE IN HPA 1030.0 1027.3 1027.8 1020.3 1015.7 1012.4 1004.2 1005.6 1013.4 1021.5 1028.0 1030.6 1030.6 DAY 7 6 2 30 10 2 2 29 27 31 22 29 MIN. QFF PRESSURE IN HPA 1008.6 1007.7 1003.5 1002.8 1003.3 995.9 995.4 998.2 1001.5 1008.7 1012.2 1014.4 995.4 DAY 28 19 12 20 28 30 7 9 4 1 8 18 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 870.2 867.0 867.0 867.6 867.7 863.3 861.3 863.9 867.1 870.6 871.5 871.6 867.4 MAX. QFE PRESSURE IN HPA 877.4 873.1 873.3 873.6 871.2 868.9 865.2 865.9 870.5 874.1 877.3 876.5 877.4 DAY 7 6 2 7 10 2 2 29 26 15 25 29 MIN. QFE PRESSURE IN HPA 860.3 859.2 857.6 860.7 862.1 857.9 857.8 861.3 863.8 866.1 866.4 864.3 857.6 DAY 28 19 12 27 28 30 25 20 4 1 9 5 MEAN QNH PRESSURE IN HPA 1021.7 1018.0 1017.9 1018.7 1018.7 1013.8 1011.4 1014.4 1018.1 1022.0 1023.1 1023.2 1018.4 MAX. QNH PRESSURE IN HPA 1029.8 1024.9 1025.1 1025.5 1022.8 1020.1 1015.9 1016.7 1022.0 1026.1 1029.7 1028.8 1029.8 DAY 7 6 2 7 10 2 2 29 26 15 25 29 MIN. QNH PRESSURE IN HPA 1010.3 1009.1 1007.3 1010.8 1012.4 1007.6 1007.5 1011.5 1014.3 1016.9 1017.3 1014.9 1007.3 DAY 28 19 12 27 28 30 25 20 4 1 9 5 MEAN QFF PRESSURE IN HPA 1023.3 1019.0 1017.1 1013.5 1010.6 1002.7 999.1 1001.6 1008.4 1014.9 1021.1 1024.0 1012.9 MAX. QFF PRESSURE IN HPA 1031.4 1027.1 1028.0 1020.2 1015.2 1012.3 1004.6 1005.9 1012.9 1021.9 1027.3 1031.8 1031.8 DAY 7 5 1 2 9 2 2 28 26 31 22 21 MIN. QFF PRESSURE IN HPA 1011.2 1008.3 1004.5 1004.7 1003.3 995.9 995.2 998.8 1002.1 1008.0 1013.0 1013.9 995.2 DAY 28 19 12 27 28 30 25 9 4 1 9 5 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 870.1 867.1 866.9 867.7 867.8 863.5 861.3 863.8 867.0 870.4 871.4 871.4 867.4 MAX. QFE PRESSURE IN HPA 876.8 873.2 873.2 872.9 871.2 869.7 865.8 866.1 870.3 873.9 876.1 876.2 876.8 DAY 6 5 2 7 10 3 2 29 22 14 25 29 MIN. QFE PRESSURE IN HPA 862.0 858.3 858.7 863.0 862.2 858.0 858.4 861.3 863.5 865.8 866.2 861.7 858.0 DAY 28 18 25 20 28 30 25 20 4 1 8 5 MEAN QNH PRESSURE IN HPA 1021.5 1018.0 1017.9 1018.8 1018.8 1014.0 1011.5 1014.3 1018.0 1021.8 1023.0 1023.0 1018.4 MAX. QNH PRESSURE IN HPA 1029.1 1025.0 1025.0 1024.7 1022.8 1021.0 1016.6 1016.9 1021.7 1025.8 1028.3 1028.5 1029.1 DAY 6 5 2 7 10 3 2 29 22 14 25 29 MIN. QNH PRESSURE IN HPA 1012.3 1008.1 1008.5 1013.4 1012.5 1007.7 1008.2 1011.5 1014.0 1016.6 1017.1 1011.9 1007.7 DAY 28 18 25 20 28 30 25 20 4 1 8 5 MEAN QFF PRESSURE IN HPA 1021.9 1018.4 1016.3 1013.4 1010.7 1003.0 999.1 1001.3 1007.8 1013.8 1020.0 1022.9 1012.4 MAX. QFF PRESSURE IN HPA 1028.5 1026.6 1027.0 1020.2 1015.3 1012.3 1005.1 1005.3 1011.9 1020.4 1026.1 1029.9 1029.9 DAY 6 5 1 2 10 3 2 29 26 31 21 21 MIN. QFF PRESSURE IN HPA 1012.2 1008.1 1003.2 1007.4 1003.8 996.8 996.2 998.5 1001.8 1007.1 1010.6 1010.7 996.2 DAY 27 19 25 19 28 30 25 9 4 1 8 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 2004 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.4 5.7 12.5 13.2 19.0 25.8 28.8 27.7 25.0 19.8 9.8 3.9 16.4 MINIMUN AIR TEMPERATURE (C) 1.6 1.0 6.5 7.4 12.4 17.6 20.6 19.4 16.8 13.4 5.4 -0.4 10.1 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 2 12 5 1 0 0 0 20 DAYS WITH MINIMUM TEMP. <=-4 0 1 0 0 0 0 0 0 0 0 0 2 3 DAYS WITH FREEZING MIN.<= 0 8 12 3 1 0 0 0 0 0 0 5 19 48 TEMPERATURE RECORDS LOWEST(C) -1.4 -4.0 -2.4 -0.2 8.0 11.8 17.8 16.8 12.2 5.0 -3.4 -9.0 -9.0 DAY 21 24 17 6 5 3 2 21 13 23 28 18 MAXIMUM AIR TEMPERATURE (C) 10.0 11.6 19.3 19.5 25.6 33.0 36.2 35.5 33.0 27.2 15.8 10.0 23.1 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 3 28 31 31 29 8 0 0 130 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 13.2 21.0 24.6 27.6 31.4 36.4 40.2 38.4 37.4 31.2 21.6 19.6 40.2 DAY 11 29 5 29 27 19 30 7 9 9 9 31 DIF. BETWEEN (MAX.-MIN.) (C) 8.4 10.6 12.8 12.1 13.2 15.4 15.6 16.1 16.2 13.8 10.4 10.4 13.0 MEAN DAILY TEMP. (MDT) (C) 5.8 6.3 12.9 13.4 19.0 25.3 28.4 27.4 24.9 20.3 10.6 4.8 16.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 12.0 130.1 229.1 199.5 116.8 22.0 0.0 0.0 709.5 HEATING DEG. DAYS(BASE 18 0C) 377.8 339.9 160.2 140.6 23.2 0.0 0.0 0.0 0.0 9.4 222.1 409.2 1682.4 DEWPOINT (MEAN C) 0.4 -2.0 -2.3 1.7 2.4 4.2 3.2 2.3 1.3 -0.6 3.1 -3.8 0.8 MIXING RATIO (G/KG) 4.69 3.94 3.93 5.26 5.51 6.10 5.68 5.32 4.92 4.41 5.85 3.52 4.93 VAPOUR PRESSURE (HPA) 6.49 5.48 5.45 7.26 7.59 8.39 7.80 7.32 6.81 6.13 8.10 4.89 6.81 SATURATION DEF. (HPA) 2.66 4.14 9.94 8.68 15.35 26.34 33.57 31.49 26.56 18.10 4.64 3.48 15.41 RELATIVE HUMIDITY (MEAN %) 73 62 40 50 38 26 21 21 22 27 66 62 42 RELATIVE HUMIDITY (MAX. %) 87 79 58 73 57 38 29 31 31 39 83 80 57 RELATIVE HUMIDITY (MIN. %) 52 39 22 29 22 17 13 12 14 16 44 38 27 RELATIVE HUMIDITY (MEAN% 03UTC) 81 71 52 65 52 36 27 28 28 34 72 68 51 RELATIVE HUMIDITY (MEAN% 09UTC) 57 45 24 33 27 18 15 13 16 19 48 46 30 RELATIVE HUMIDITY (MEAN% 15UTC) 74 59 32 41 27 20 15 14 18 23 68 65 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 196.4 45.2 16.2 60.1 41.1 0.0 0.0 0.0 0.0 3.0 105.1 55.0 522.1 DAYS WITH PRECIPITATION >=10 7 1 0 2 2 0 0 0 0 0 4 1 17 DAYS WITH PRECIPITATION >= 5 8 4 2 4 2 0 0 0 0 0 7 3 30 DAYS WITH PRECIPITATION >= 1 12 7 3 10 3 0 0 0 0 2 11 6 54 DAYS WITH PRECIPITATION 14 10 4 13 4 0 0 0 0 2 13 7 67 GREATEST DAILY PRECIPITATION 39.4 18.0 6.1 17.1 27.2 0.0 0.0 0.0 0.0 2.0 20.0 35.0 39.4 DAY 13 2 19 23 3 ** ** ** ** 31 10 25 DAY WITH THUNDER STORM 5 4 1 7 3 1 0 0 0 1 11 1 34 DAYS WITH SNOW OR SLEET 6 4 0 1 0 0 0 0 0 0 2 3 16 DAYS WITH DUST 0 1 0 2 3 0 0 0 0 0 0 0 6 WIND DIRECTION (PREVAILING) 135 135 135 135 135 315 315 315 135 135 135 135 135 PREVAILING WIND SPEED(KNOTS) 6.6 6.9 5.7 7.9 6.1 8.8 7.6 8.0 4.6 5.3 6.4 5.3 6.1 PREVAILING WIND PERCENT 34.7 35.8 23.8 26.3 22.6 31.3 19.4 33.9 19.2 19.8 30.4 20.6 21.7 CALMS PERCENT OF WIND 23.4 23.3 27.0 19.6 19.0 14.2 19.0 29.0 35.8 43.1 36.7 48.8 28.3 NO. OF WIND OBSERVATION 248 232 248 240 248 240 248 248 240 248 240 248 2928 VECTOR WIND DIRECTION (MEAN) 155 161 186 158 216 309 266 300 252 230 157 157 205 VECTOR WIND MAGNITUDE(KNOTS) 3.8 2.9 1.8 2.6 1.1 4.0 1.8 3.4 1.2 0.7 2.5 1.4 1.1 WIND STEADINESES (MEAN %) 77.6 53.7 36.7 46.4 20.4 59.7 33.3 64.2 28.6 18.9 62.5 46.7 22.4 WIND SPEED (MEAN KNOTS) 4.9 5.4 4.9 5.6 5.4 6.7 5.4 5.3 4.2 3.7 4.0 3.0 4.9 FASTEST WIND DIRECTION 160 140 160 180 160 320 310 280 270 280 150 50 160 FASTEST WIND SPEED (KNOTS) 19 25 21 21 35 21 17 16 16 19 19 23 35 DAY 23 11 6 19 15 9 4 3 9 21 22 27 DAYS WITH SKY CLEAR (0-2)/8 8 11 13 10 20 30 28 31 30 20 12 14 227 DAYS WITH P.CLOUDY (3-6)/8 12 12 15 13 8 0 2 0 0 9 8 10 89 DAYS WITH CLOUDY (7-8)/8 11 6 3 7 3 0 1 0 0 2 10 7 50 DAYS WITH VISIBILITY =< 2 KM 6 4 0 1 0 0 0 1 0 0 2 3 17 DURATION OF SUNSHINE HOURS 162.6 191.8 264.9 229.5 299.9 380.6 360.9 380.2 329.5 269.7 167.4 180.1 3217.1 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 867.3 869.7 869.7 866.5 865.6 864.1 862.3 863.2 867.9 872.0 870.9 869.9 867.4 MAX. QFE PRESSURE IN HPA 872.3 876.5 874.8 872.2 871.3 868.6 865.4 867.0 873.1 875.7 876.0 877.1 877.1 DAY-HOUR 16- 9 8- 9 23- 6 28- 6 18- 9 2-21 17- 9 29- 6 25- 6 15- 6 29- 3 3- 6 MIN. QFE PRESSURE IN HPA 860.0 861.9 860.0 858.5 857.6 858.0 855.4 859.2 862.7 866.2 861.2 861.3 855.4 DAY-HOUR 23-12 15- 0 31-15 17- 0 13- 3 15-15 11- 0 3- 0 16- 3 22- 0 22-21 25-15 MEAN QNH PRESSURE IN HPA 1018.4 1021.1 1021.0 1017.4 1016.4 1014.7 1012.6 1013.6 1019.0 1023.7 1022.4 1021.3 1018.5 MAX. QNH PRESSURE IN HPA 1024.0 1028.8 1026.9 1023.9 1022.9 1019.8 1016.1 1018.0 1024.9 1027.9 1028.2 1029.5 1029.5 DAY-HOUR 16- 9 8- 9 23- 6 28- 6 18- 9 2-21 17- 9 29- 6 25- 6 15- 6 29- 3 3- 6 MIN. QNH PRESSURE IN HPA 1010.0 1012.2 1010.0 1008.3 1007.3 1007.7 1004.8 1009.1 1013.1 1017.1 1011.4 1011.5 1004.8 DAY-HOUR 23-12 15- 0 31-15 17- 0 13- 3 15-15 11- 0 3- 0 16- 3 22- 0 22-21 25-15 MEAN QFF PRESSURE IN HPA 1018.7 1021.5 1017.5 1013.3 1009.1 1003.8 1000.3 1001.9 1008.7 1016.2 1020.2 1022.7 1012.8 MAX. QFF PRESSURE IN HPA 1025.0 1031.6 1023.6 1022.6 1016.7 1011.5 1003.7 1006.8 1015.0 1024.0 1032.3 1033.7 1033.7 DAY-HOUR 1- 6 8- 6 23- 6 6- 6 18-18 3- 3 13-21 23-18 30-18 24- 6 29- 3 18- 6 MIN. QFF PRESSURE IN HPA 1008.7 1008.0 1004.7 1003.7 999.8 996.1 992.6 996.2 1001.7 1008.3 1007.1 1012.6 992.6 DAY-HOUR 13- 0 15- 0 31-12 16-12 15-12 15-15 11- 0 3- 0 2- 0 22- 0 22-21 25-15 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 867.4 869.6 869.4 866.1 865.1 863.8 861.9 862.8 867.4 871.6 870.8 869.7 867.1 MAX. QFE PRESSURE IN HPA 871.9 875.8 873.8 870.6 869.3 867.6 864.0 866.1 871.8 874.7 875.8 876.2 876.2 DAY 1 9 24 28 19 5 17 29 27 15 29 4 MIN. QFE PRESSURE IN HPA 861.7 861.9 862.2 858.5 858.2 858.6 855.4 859.2 862.8 866.2 861.7 863.9 855.4 DAY 13 15 31 17 13 15 11 3 16 22 23 16 MEAN QNH PRESSURE IN HPA 1018.4 1020.9 1020.7 1016.9 1015.8 1014.3 1012.2 1013.2 1018.4 1023.2 1022.3 1021.0 1018.1 MAX. QNH PRESSURE IN HPA 1023.6 1028.0 1025.7 1022.1 1020.6 1018.7 1014.6 1016.9 1023.4 1026.7 1028.0 1028.5 1028.5 DAY 1 9 24 28 19 5 17 29 27 15 29 4 MIN. QNH PRESSURE IN HPA 1011.9 1012.2 1012.5 1008.3 1007.9 1008.4 1004.8 1009.1 1013.2 1017.1 1011.9 1014.4 1004.8 DAY 13 15 31 17 13 15 11 3 16 22 23 16 MEAN QFF PRESSURE IN HPA 1018.3 1021.0 1016.9 1012.8 1008.5 1003.7 1000.0 1001.4 1007.8 1015.2 1019.6 1021.9 1012.3 MAX. QFF PRESSURE IN HPA 1024.4 1029.0 1022.7 1020.6 1014.9 1010.1 1003.1 1005.7 1013.1 1020.7 1030.8 1030.1 1030.8 DAY 1 9 17 6 18 3 25 29 27 24 29 18 MIN. QFF PRESSURE IN HPA 1008.7 1008.0 1005.7 1004.7 1000.4 996.6 992.6 996.2 1001.7 1008.3 1007.9 1015.4 992.6 DAY 13 15 31 17 13 20 11 3 2 22 23 25 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 867.1 869.5 869.6 866.2 865.2 864.1 862.1 863.0 867.7 871.9 870.9 869.6 867.2 MAX. QFE PRESSURE IN HPA 871.5 875.4 873.8 870.9 870.1 868.0 864.2 866.3 871.9 875.0 876.0 876.2 876.2 DAY 1 9 24 28 18 5 17 29 27 15 29 4 MIN. QFE PRESSURE IN HPA 860.8 862.8 861.9 858.5 857.6 858.6 855.9 859.4 862.7 866.9 862.2 863.8 855.9 DAY 13 15 31 17 13 15 11 3 16 22 23 25 MEAN QNH PRESSURE IN HPA 1018.1 1020.8 1020.9 1017.0 1016.0 1014.6 1012.4 1013.4 1018.7 1023.6 1022.4 1021.0 1018.2 MAX. QNH PRESSURE IN HPA 1023.1 1027.5 1025.7 1022.4 1021.5 1019.1 1014.8 1017.2 1023.6 1027.1 1028.2 1028.5 1028.5 DAY 1 9 24 28 18 5 17 29 27 15 29 4 MIN. QNH PRESSURE IN HPA 1010.9 1013.2 1012.2 1008.3 1007.3 1008.4 1005.3 1009.3 1013.1 1017.9 1012.5 1014.3 1005.3 DAY 13 15 31 17 13 15 11 3 16 22 23 25 MEAN QFF PRESSURE IN HPA 1018.9 1021.8 1018.0 1013.4 1009.1 1004.2 1000.5 1002.3 1009.2 1016.8 1020.8 1023.1 1013.2 MAX. QFF PRESSURE IN HPA 1024.4 1030.3 1023.4 1021.4 1016.1 1011.5 1003.7 1006.7 1014.3 1022.9 1032.3 1032.5 1032.5 DAY 1 8 23 6 18 3 25 29 27 24 29 18 MIN. QFF PRESSURE IN HPA 1009.1 1010.8 1006.3 1005.0 1000.0 997.4 993.7 997.5 1003.2 1010.5 1010.4 1015.0 993.7 DAY 13 15 31 23 13 20 11 3 2 22 23 25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 867.9 870.3 870.4 867.0 866.1 864.6 862.7 863.5 868.6 873.0 871.8 870.6 868.0 MAX. QFE PRESSURE IN HPA 872.1 876.0 874.8 872.2 871.0 868.6 865.3 867.0 873.1 875.7 876.0 877.1 877.1 DAY 16 9 23 28 18 5 17 29 25 15 29 3 MIN. QFE PRESSURE IN HPA 861.6 863.3 862.2 859.8 859.3 859.1 856.6 859.9 863.4 869.1 863.8 864.3 856.6 DAY 13 15 31 17 15 15 11 3 16 22 23 15 MEAN QNH PRESSURE IN HPA 1019.0 1021.8 1021.8 1018.0 1016.9 1015.2 1013.0 1014.0 1019.8 1024.8 1023.4 1022.1 1019.2 MAX. QNH PRESSURE IN HPA 1023.8 1028.2 1026.9 1023.9 1022.5 1019.8 1016.0 1018.0 1024.9 1027.9 1028.2 1029.5 1029.5 DAY 16 9 23 28 18 5 17 29 25 15 29 3 MIN. QNH PRESSURE IN HPA 1011.8 1013.8 1012.5 1009.8 1009.2 1009.0 1006.1 1009.9 1013.9 1020.4 1014.3 1014.9 1006.1 DAY 13 15 31 17 15 15 11 3 16 22 23 15 MEAN QFF PRESSURE IN HPA 1019.9 1022.6 1018.6 1013.9 1009.6 1004.1 1000.5 1002.0 1009.6 1017.5 1021.7 1024.2 1013.7 MAX. QFF PRESSURE IN HPA 1025.0 1031.6 1023.6 1022.6 1016.1 1010.9 1003.7 1006.3 1014.7 1024.0 1031.9 1033.7 1033.7 DAY 1 8 23 6 18 3 25 29 27 24 29 18 MIN. QFF PRESSURE IN HPA 1010.2 1012.4 1007.3 1006.4 1002.4 997.3 993.7 997.0 1004.3 1012.7 1012.8 1015.5 993.7 DAY 13 15 31 23 15 15 11 3 1 22 23 25 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 867.8 870.3 870.3 867.0 866.0 864.5 862.7 863.5 868.3 872.4 871.1 870.2 867.8 MAX. QFE PRESSURE IN HPA 872.3 876.5 874.6 871.7 871.3 868.6 865.4 866.7 872.2 875.2 875.4 876.8 876.8 DAY 16 8 9 28 18 5 17 29 25 26 29 3 MIN. QFE PRESSURE IN HPA 861.5 863.8 861.7 860.9 858.5 858.9 856.8 859.9 863.8 868.7 863.7 863.2 856.8 DAY 23 15 31 17 15 15 11 3 16 21 23 25 MEAN QNH PRESSURE IN HPA 1018.8 1021.7 1021.7 1018.0 1016.9 1015.1 1013.1 1014.0 1019.5 1024.2 1022.6 1021.6 1018.9 MAX. QNH PRESSURE IN HPA 1024.0 1028.8 1026.6 1023.3 1022.9 1019.8 1016.1 1017.6 1023.9 1027.3 1027.5 1029.1 1029.1 DAY 16 8 9 28 18 5 17 29 25 26 29 3 MIN. QNH PRESSURE IN HPA 1011.7 1014.3 1011.9 1011.0 1008.3 1008.7 1006.4 1009.9 1014.3 1019.9 1014.2 1013.6 1006.4 DAY 23 15 31 17 15 15 11 3 16 21 23 25 MEAN QFF PRESSURE IN HPA 1018.7 1021.6 1017.8 1013.5 1009.5 1004.1 1000.5 1001.9 1008.7 1016.2 1019.8 1022.5 1012.9 MAX. QFF PRESSURE IN HPA 1023.9 1031.1 1022.9 1020.7 1016.6 1011.1 1003.7 1006.0 1013.8 1021.7 1029.3 1032.3 1032.3 DAY 16 8 22 6 18 2 25 29 24 24 28 18 MIN. QFF PRESSURE IN HPA 1009.8 1011.2 1007.1 1006.1 1001.1 996.7 994.2 997.0 1003.3 1012.0 1012.9 1014.4 994.2 DAY 13 14 31 16 15 15 11 3 1 9 23 25 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 866.6 868.9 869.2 866.3 865.4 863.8 862.2 862.8 867.4 871.4 870.2 869.2 866.9 MAX. QFE PRESSURE IN HPA 871.2 875.9 873.5 870.7 870.7 867.7 864.3 865.7 871.0 874.1 874.7 875.7 875.9 DAY 16 8 23 27 18 1 17 29 26 26 28 3 MIN. QFE PRESSURE IN HPA 860.0 863.2 860.4 860.1 857.6 858.3 856.5 859.9 863.0 867.4 864.8 861.5 856.5 DAY 23 14 31 16 15 15 11 3 16 21 27 25 MEAN QNH PRESSURE IN HPA 1017.6 1020.2 1020.5 1017.2 1016.1 1014.3 1012.5 1013.2 1018.5 1023.0 1021.6 1020.5 1017.9 MAX. QNH PRESSURE IN HPA 1022.8 1028.1 1025.4 1022.2 1022.2 1018.8 1014.9 1016.5 1022.5 1026.1 1026.7 1027.9 1028.1 DAY 16 8 23 27 18 1 17 29 26 26 28 3 MIN. QNH PRESSURE IN HPA 1010.0 1013.6 1010.5 1010.1 1007.3 1008.1 1006.0 1009.9 1013.4 1018.4 1015.5 1011.7 1006.0 DAY 23 14 31 16 15 15 11 3 16 21 27 25 MEAN QFF PRESSURE IN HPA 1017.4 1020.1 1016.7 1013.0 1008.9 1003.6 1000.1 1001.4 1007.9 1015.1 1019.0 1021.2 1012.0 MAX. QFF PRESSURE IN HPA 1022.8 1030.0 1021.6 1020.1 1016.4 1010.4 1003.0 1005.4 1012.4 1020.3 1028.7 1031.7 1031.7 DAY 16 8 23 6 18 2 23 23 30 24 28 18 MIN. QFF PRESSURE IN HPA 1009.7 1009.0 1004.7 1003.7 999.8 996.9 993.9 997.6 1001.8 1011.4 1012.0 1012.7 993.9 DAY 7 14 31 16 15 19 11 2 1 21 18 25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 867.0 869.3 869.2 866.1 865.1 863.5 861.7 862.7 867.4 871.5 870.6 869.6 867.0 MAX. QFE PRESSURE IN HPA 871.0 875.6 873.7 870.7 870.5 867.5 863.9 865.8 871.0 874.4 875.3 876.2 876.2 DAY 16 8 8 27 18 5 17 23 26 26 28 3 MIN. QFE PRESSURE IN HPA 860.5 863.0 860.0 859.7 857.8 858.0 856.5 859.7 862.9 866.3 865.6 861.3 856.5 DAY 23 14 31 16 15 15 11 2 16 21 22 25 MEAN QNH PRESSURE IN HPA 1018.0 1020.6 1020.4 1016.9 1015.8 1014.0 1012.0 1013.1 1018.5 1023.1 1022.1 1020.9 1018.0 MAX. QNH PRESSURE IN HPA 1022.5 1027.8 1025.6 1022.2 1022.0 1018.5 1014.4 1016.6 1022.5 1026.4 1027.4 1028.5 1028.5 DAY 16 8 8 27 18 5 17 23 26 26 28 3 MIN. QNH PRESSURE IN HPA 1010.6 1013.4 1010.0 1009.7 1007.5 1007.7 1006.0 1009.7 1013.3 1017.2 1016.4 1011.5 1006.0 DAY 23 14 31 16 15 15 11 2 16 21 22 25 MEAN QFF PRESSURE IN HPA 1018.7 1021.4 1017.6 1013.3 1008.9 1003.5 1000.1 1002.0 1008.9 1016.4 1020.5 1023.0 1012.8 MAX. QFF PRESSURE IN HPA 1023.5 1030.8 1022.4 1020.5 1016.5 1010.5 1003.1 1006.0 1014.0 1022.2 1031.4 1032.8 1032.8 DAY 16 8 23 6 18 3 23 23 30 23 28 18 MIN. QFF PRESSURE IN HPA 1011.7 1009.7 1005.3 1004.6 1000.7 996.1 994.3 997.4 1003.0 1011.2 1012.9 1012.6 994.3 DAY 23 14 31 16 15 15 11 2 1 21 18 25 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 867.6 870.0 869.9 866.9 865.9 864.4 862.7 863.7 868.4 872.5 871.2 870.3 867.8 MAX. QFE PRESSURE IN HPA 871.4 876.1 874.6 871.4 871.1 868.4 864.9 866.9 872.4 875.7 875.9 877.0 877.0 DAY 16 8 23 27 18 5 16 23 26 26 28 3 MIN. QFE PRESSURE IN HPA 861.5 863.6 861.2 860.1 859.4 859.0 857.1 860.7 864.0 867.3 864.9 862.4 857.1 DAY 23 1 31 16 15 15 10 2 16 21 22 25 MEAN QNH PRESSURE IN HPA 1018.6 1021.4 1021.3 1017.8 1016.8 1015.0 1013.0 1014.3 1019.6 1024.2 1022.7 1021.8 1018.9 MAX. QNH PRESSURE IN HPA 1023.0 1028.3 1026.6 1023.0 1022.6 1019.6 1015.6 1017.9 1024.1 1027.9 1028.1 1029.4 1029.4 DAY 16 8 23 27 18 5 16 23 26 26 28 3 MIN. QNH PRESSURE IN HPA 1011.7 1014.1 1011.4 1010.1 1009.3 1008.9 1006.7 1010.8 1014.6 1018.3 1015.6 1012.7 1006.7 DAY 23 1 31 16 15 15 10 2 16 21 22 25 MEAN QFF PRESSURE IN HPA 1019.4 1022.1 1018.0 1013.7 1009.4 1003.8 1000.4 1002.3 1009.4 1017.0 1021.1 1023.8 1013.4 MAX. QFF PRESSURE IN HPA 1024.3 1031.3 1023.0 1020.5 1016.7 1010.5 1002.9 1006.8 1015.0 1022.7 1032.3 1032.1 1032.3 DAY 16 8 23 5 18 2 25 23 30 24 28 18 MIN. QFF PRESSURE IN HPA 1012.8 1011.8 1007.1 1005.6 1002.1 996.9 994.0 997.4 1003.6 1010.7 1012.9 1014.1 994.0 DAY 23 14 31 16 12 19 10 2 1 21 22 25 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 867.6 870.1 869.7 866.9 866.0 864.4 862.7 863.6 868.2 872.1 870.9 870.2 867.7 MAX. QFE PRESSURE IN HPA 871.1 875.9 874.6 871.5 871.1 868.6 864.5 866.5 872.5 875.5 875.8 876.4 876.4 DAY 16 8 23 27 18 2 16 28 30 26 28 3 MIN. QFE PRESSURE IN HPA 861.5 864.1 861.2 859.6 859.1 859.6 856.9 860.5 863.8 866.5 861.2 863.4 856.9 DAY 23 1 31 16 15 14 10 2 1 21 22 25 MEAN QNH PRESSURE IN HPA 1018.6 1021.5 1021.1 1017.8 1016.8 1015.0 1013.0 1014.1 1019.3 1023.8 1022.4 1021.6 1018.7 MAX. QNH PRESSURE IN HPA 1022.6 1028.1 1026.6 1023.1 1022.6 1019.8 1015.1 1017.4 1024.2 1027.7 1028.0 1028.7 1028.7 DAY 16 8 23 27 18 2 16 28 30 26 28 3 MIN. QNH PRESSURE IN HPA 1011.7 1014.7 1011.4 1009.5 1009.0 1009.5 1006.5 1010.6 1014.3 1017.4 1011.4 1013.9 1006.5 DAY 23 1 31 16 15 14 10 2 1 21 22 25 MEAN QFF PRESSURE IN HPA 1018.4 1021.4 1017.1 1013.2 1009.4 1003.9 1000.5 1002.0 1008.7 1015.8 1019.7 1022.4 1012.7 MAX. QFF PRESSURE IN HPA 1023.1 1029.4 1022.9 1020.2 1016.1 1011.3 1003.7 1005.9 1014.7 1020.8 1030.6 1029.9 1030.6 DAY 16 8 16 5 18 2 13 23 30 24 28 17 MIN. QFF PRESSURE IN HPA 1011.0 1010.9 1007.1 1005.7 1002.1 996.8 993.8 997.1 1002.1 1008.3 1007.1 1014.9 993.8 DAY 12 14 31 16 12 19 10 2 1 21 22 25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M MEANS AND EXTREMES FOR THE YEAR 2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 3.7 3.1 8.8 16.0 20.1 25.8 29.6 28.2 23.3 17.9 10.2 8.7 16.3 MINIMUN AIR TEMPERATURE (C) -0.6 -1.5 3.6 9.8 13.2 17.5 21.4 20.8 14.8 11.1 4.7 3.8 9.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 3 19 15 0 0 0 0 37 DAYS WITH MINIMUM TEMP. <=-4 5 9 0 0 0 0 0 0 0 0 0 1 15 DAYS WITH FREEZING MIN.<= 0 17 16 5 0 0 0 0 0 0 0 0 4 42 TEMPERATURE RECORDS LOWEST(C) -6.6 -13.6 -3.8 1.0 2.0 11.8 16.8 17.6 11.0 1.8 0.8 -4.2 -13.6 DAY 12 11 26 5 6 7 6 22 28 23 14 27 MAXIMUM AIR TEMPERATURE (C) 9.2 8.9 14.3 22.4 26.4 32.6 36.7 35.5 31.4 25.5 17.3 15.5 23.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 2 6 26 31 31 25 3 0 0 124 DAYS WITH MAXIMUM TEMP. <= 0 0 1 0 0 0 0 0 0 0 0 0 0 1 TEMPERATURE RECORDS HIGHEST(C) 18.2 16.4 21.6 30.6 31.2 36.8 39.6 38.6 35.4 31.2 23.6 23.0 39.6 DAY 1 20 30 23 23 16 18 17 10 11 1 4 DIF. BETWEEN (MAX.-MIN.) (C) 9.8 10.4 10.7 12.6 13.2 15.1 15.3 14.7 16.6 14.4 12.6 11.7 13.1 MEAN DAILY TEMP. (MDT) (C) 4.3 3.7 9.0 16.1 19.8 25.1 29.1 28.1 23.1 18.3 11.0 9.7 16.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 4.9 20.9 124.0 250.5 221.6 71.1 9.5 0.0 0.0 702.5 HEATING DEG. DAYS(BASE 18 0C) 424.9 400.2 280.4 76.9 24.7 0.0 0.0 0.0 0.0 44.1 208.9 258.2 1718.3 DEWPOINT (MEAN C) -3.5 -3.0 -0.1 2.6 3.1 1.8 4.8 4.4 -0.0 -1.1 -0.0 -2.1 0.6 MIXING RATIO (G/KG) 3.53 3.80 4.64 5.52 5.63 5.17 6.35 6.32 4.54 4.34 4.55 3.98 4.86 VAPOUR PRESSURE (HPA) 4.90 5.26 6.42 7.63 7.77 7.11 8.71 8.67 6.27 6.03 6.31 5.53 6.72 SATURATION DEF. (HPA) 3.40 2.94 5.42 11.62 17.12 27.59 34.50 31.16 23.96 15.94 6.80 6.37 15.57 RELATIVE HUMIDITY (MEAN %) 64 68 58 45 35 23 22 24 24 30 54 52 42 RELATIVE HUMIDITY (MAX. %) 81 85 77 65 53 35 32 36 37 46 71 67 57 RELATIVE HUMIDITY (MIN. %) 43 46 38 26 22 13 13 13 13 16 33 31 26 RELATIVE HUMIDITY (MEAN% 03UTC) 70 76 68 57 48 31 29 33 32 40 66 60 51 RELATIVE HUMIDITY (MEAN% 09UTC) 50 52 42 30 24 15 15 16 14 18 36 35 29 RELATIVE HUMIDITY (MEAN% 15UTC) 68 66 51 36 26 16 16 17 17 27 53 52 37 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 88.6 114.7 186.4 40.3 4.0 0.0 0.0 0.3 0.0 1.8 31.9 96.4 564.4 DAYS WITH PRECIPITATION >=10 3 6 3 1 0 0 0 0 0 0 1 4 18 DAYS WITH PRECIPITATION >= 5 6 8 5 3 0 0 0 0 0 0 1 6 29 DAYS WITH PRECIPITATION >= 1 9 11 7 4 1 0 0 0 0 1 3 7 43 DAYS WITH PRECIPITATION 10 14 10 6 5 0 0 1 0 2 4 7 59 GREATEST DAILY PRECIPITATION 28.0 21.2 79.0 24.0 3.0 0.0 0.0 0.3 0.0 1.3 27.3 28.0 79.0 DAY 22 7 11 26 3 ** ** 14 ** 29 16 16 DAY WITH THUNDER STORM 3 6 8 4 6 0 0 0 0 0 1 6 34 DAYS WITH SNOW OR SLEET 9 8 0 0 0 0 0 0 0 0 0 0 17 DAYS WITH DUST 0 0 0 1 2 4 14 5 0 2 0 0 28 WIND DIRECTION (PREVAILING) 135 135 135 135 135 315 315 270 270 135 135 135 135 PREVAILING WIND SPEED(KNOTS) 7.4 6.3 6.2 6.4 5.8 9.1 9.8 8.8 8.4 5.6 5.2 5.4 5.8 PREVAILING WIND PERCENT 32.3 27.2 21.4 26.3 22.2 25.0 25.0 20.6 20.0 23.8 22.5 29.4 21.4 CALMS PERCENT OF WIND 41.9 48.2 39.9 35.0 28.6 25.8 26.6 35.1 34.6 36.3 47.5 41.5 36.7 NO. OF WIND OBSERVATION 248 224 248 240 248 240 248 248 240 248 240 248 2920 VECTOR WIND DIRECTION (MEAN) 150 148 206 175 195 303 298 284 266 163 155 138 210 VECTOR WIND MAGNITUDE(KNOTS) 2.9 2.1 1.4 2.0 1.6 2.9 3.1 2.7 1.9 1.8 1.4 1.9 0.9 WIND STEADINESES (MEAN %) 70.7 65.6 34.1 44.4 32.0 49.2 53.4 55.1 44.2 46.2 48.3 61.3 20.9 WIND SPEED (MEAN KNOTS) 4.1 3.2 4.1 4.5 5.0 5.9 5.8 4.9 4.3 3.9 2.9 3.1 4.3 FASTEST WIND DIRECTION 150 160 150 150 210 270 320 300 300 120 140 120 270 FASTEST WIND SPEED (KNOTS) 21 17 21 19 21 27 23 19 16 17 17 21 27 DAY 18 1 4 15 1 29 5 25 5 6 5 16 DAYS WITH SKY CLEAR (0-2)/8 11 9 17 17 17 30 31 29 30 24 17 13 245 DAYS WITH P.CLOUDY (3-6)/8 11 10 6 10 10 0 0 2 0 5 11 13 78 DAYS WITH CLOUDY (7-8)/8 9 9 8 3 4 0 0 0 0 2 2 5 42 DAYS WITH VISIBILITY =< 2 KM 7 9 2 1 1 3 3 5 0 0 0 3 34 DURATION OF SUNSHINE HOURS 171.4 168.2 231.6 278.0 270.6 364.3 364.8 317.8 323.3 261.0 228.4 206.0 3185.4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 868.7 867.2 868.0 868.6 866.3 863.6 862.1 863.0 866.5 871.0 870.8 871.0 867.2 MAX. QFE PRESSURE IN HPA 874.9 872.9 874.1 874.8 870.2 868.4 867.1 866.8 870.6 875.6 876.6 876.2 876.6 DAY-HOUR 21- 9 16- 9 29- 6 21- 6 9- 9 15- 9 19-18 26-21 26- 6 11- 6 23- 6 8- 6 MIN. QFE PRESSURE IN HPA 857.3 860.9 860.8 863.2 859.3 859.0 858.2 858.0 863.1 865.0 864.9 861.6 857.3 DAY-HOUR 22-21 8-15 24- 3 29-15 3- 0 28-21 6- 3 8- 3 1- 0 20- 0 8-12 23-12 MEAN QNH PRESSURE IN HPA 1019.9 1018.2 1019.1 1019.7 1017.2 1014.1 1012.4 1013.4 1017.3 1022.5 1022.3 1022.6 1018.2 MAX. QNH PRESSURE IN HPA 1027.0 1024.7 1026.1 1026.9 1021.6 1019.6 1018.1 1017.7 1022.1 1027.8 1028.9 1028.5 1028.9 DAY-HOUR 21- 9 16- 9 29- 6 21- 6 9- 9 15- 9 19-18 26-21 26- 6 11- 6 23- 6 8- 6 MIN. QNH PRESSURE IN HPA 1006.9 1011.0 1010.9 1013.6 1009.2 1008.9 1007.9 1007.7 1013.5 1015.7 1015.6 1011.8 1006.9 DAY-HOUR 22-21 8-15 24- 3 29-15 3- 0 28-21 6- 3 8- 3 1- 0 20- 0 8-12 23-12 MEAN QFF PRESSURE IN HPA 1021.4 1020.0 1017.6 1014.2 1009.4 1003.4 999.6 1001.3 1007.9 1016.0 1020.0 1021.2 1012.7 MAX. QFF PRESSURE IN HPA 1029.7 1029.6 1024.7 1022.7 1014.5 1010.6 1004.2 1006.5 1014.9 1024.7 1028.4 1032.5 1032.5 DAY-HOUR 21- 6 14-21 6- 6 5- 6 6-18 1- 3 19-18 27- 3 30-21 23- 3 23- 6 27- 6 MIN. QFF PRESSURE IN HPA 1007.8 1010.9 1006.9 1006.8 1000.8 998.2 995.8 994.3 1002.9 1007.0 1011.1 1009.7 994.3 DAY-HOUR 3- 0 1-12 23-12 26- 0 3- 0 19-12 5-12 8- 9 1- 0 20- 0 5-12 23-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 868.7 867.0 867.6 868.0 865.8 863.2 861.7 862.6 866.0 870.5 870.7 870.9 866.9 MAX. QFE PRESSURE IN HPA 873.9 871.5 872.7 872.4 869.4 867.1 865.4 866.2 869.0 874.2 875.3 875.1 875.3 DAY 1 16 29 21 17 15 20 28 26 11 23 8 MIN. QFE PRESSURE IN HPA 857.3 861.1 861.2 863.7 859.3 859.4 858.9 858.9 863.1 865.0 865.9 863.3 857.3 DAY 23 9 24 30 3 29 5 9 1 20 8 24 MEAN QNH PRESSURE IN HPA 1019.9 1017.9 1018.6 1019.2 1016.6 1013.7 1011.9 1013.0 1016.8 1022.0 1022.2 1022.5 1017.9 MAX. QNH PRESSURE IN HPA 1025.8 1023.1 1024.5 1024.1 1020.7 1018.1 1016.1 1017.1 1020.3 1026.2 1027.4 1027.2 1027.4 DAY 1 16 29 21 17 15 20 28 26 11 23 8 MIN. QNH PRESSURE IN HPA 1006.9 1011.3 1011.4 1014.2 1009.2 1009.3 1008.7 1008.7 1013.5 1015.7 1016.7 1013.8 1006.9 DAY 23 9 24 30 3 29 5 9 1 20 8 24 MEAN QFF PRESSURE IN HPA 1020.9 1019.3 1016.8 1013.4 1008.7 1003.1 999.2 1000.7 1007.1 1015.2 1019.4 1020.3 1012.0 MAX. QFF PRESSURE IN HPA 1027.3 1027.7 1022.3 1021.0 1013.4 1010.0 1003.1 1005.7 1012.0 1023.2 1025.6 1030.8 1030.8 DAY 21 15 26 5 17 1 16 28 28 23 23 27 MIN. QFF PRESSURE IN HPA 1007.8 1014.2 1008.7 1006.8 1000.8 998.4 995.9 995.8 1002.9 1007.0 1012.7 1012.3 995.8 DAY 3 7 24 26 3 19 5 8 1 20 5 24 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 868.5 866.9 867.7 868.3 866.1 863.5 861.8 862.7 866.3 870.7 870.8 870.9 867.0 MAX. QFE PRESSURE IN HPA 873.8 871.5 873.1 872.6 869.7 867.7 865.5 866.2 869.8 874.6 875.6 875.4 875.6 DAY 1 16 29 21 17 15 19 28 26 11 23 8 MIN. QFE PRESSURE IN HPA 857.7 861.1 860.8 864.5 859.5 859.7 858.2 858.0 863.4 865.6 865.6 863.8 857.7 DAY 23 7 24 30 3 20 6 8 12 20 8 24 MEAN QNH PRESSURE IN HPA 1019.7 1017.8 1018.8 1019.5 1017.0 1014.0 1012.0 1013.1 1017.2 1022.2 1022.3 1022.4 1018.0 MAX. QNH PRESSURE IN HPA 1025.7 1023.1 1024.9 1024.3 1021.0 1018.8 1016.3 1017.1 1021.2 1026.6 1027.8 1027.5 1027.8 DAY 1 16 29 21 17 15 19 28 26 11 23 8 MIN. QNH PRESSURE IN HPA 1007.4 1011.3 1010.9 1015.1 1009.4 1009.7 1007.9 1007.7 1013.9 1016.4 1016.4 1014.3 1007.4 DAY 23 7 24 30 3 20 6 8 12 20 8 24 MEAN QFF PRESSURE IN HPA 1021.8 1020.2 1017.8 1014.4 1009.5 1003.8 999.9 1001.6 1008.6 1016.6 1020.8 1021.7 1013.1 MAX. QFF PRESSURE IN HPA 1028.6 1028.2 1023.5 1022.5 1014.3 1010.6 1004.1 1006.5 1013.4 1024.7 1027.6 1031.4 1031.4 DAY 13 11 26 5 17 1 16 27 28 23 23 27 MIN. QFF PRESSURE IN HPA 1010.0 1014.0 1008.3 1006.9 1002.0 999.0 997.1 996.1 1004.4 1008.1 1013.3 1014.0 996.1 DAY 23 1 24 26 3 25 5 8 1 20 5 24 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 869.4 867.7 868.6 869.3 867.0 864.0 862.3 863.3 867.0 871.7 871.7 872.0 867.8 MAX. QFE PRESSURE IN HPA 874.6 872.4 874.1 874.8 870.1 868.2 866.5 866.8 870.6 875.6 876.6 876.2 876.6 DAY 21 16 29 21 17 15 19 28 26 11 23 8 MIN. QFE PRESSURE IN HPA 861.5 862.4 861.8 865.2 860.3 860.2 859.0 858.1 864.1 866.2 866.2 865.3 858.1 DAY 23 9 24 2 5 29 5 8 12 20 8 24 MEAN QNH PRESSURE IN HPA 1020.7 1018.8 1019.8 1020.6 1017.9 1014.6 1012.7 1013.8 1018.0 1023.3 1023.3 1023.6 1018.9 MAX. QNH PRESSURE IN HPA 1026.6 1024.1 1026.1 1026.9 1021.5 1019.3 1017.4 1017.7 1022.1 1027.8 1028.9 1028.5 1028.9 DAY 21 16 29 21 17 15 19 28 26 11 23 8 MIN. QNH PRESSURE IN HPA 1011.7 1012.7 1012.0 1015.9 1010.3 1010.2 1008.9 1007.8 1014.7 1017.1 1017.1 1016.0 1007.8 DAY 23 9 24 2 5 29 5 8 12 20 8 24 MEAN QFF PRESSURE IN HPA 1022.7 1021.1 1018.6 1015.2 1009.9 1003.5 999.6 1001.5 1008.3 1017.0 1021.4 1022.9 1013.5 MAX. QFF PRESSURE IN HPA 1029.7 1028.2 1024.7 1022.7 1014.1 1009.8 1003.8 1006.1 1013.5 1024.2 1028.4 1032.5 1032.5 DAY 21 12 6 5 7 1 16 29 28 23 23 27 MIN. QFF PRESSURE IN HPA 1011.7 1013.6 1010.2 1009.0 1005.4 998.5 996.1 994.9 1003.7 1008.3 1012.9 1015.1 994.9 DAY 3 21 24 2 3 29 5 8 1 20 5 24 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 869.0 867.7 868.4 869.1 866.9 864.0 862.4 863.3 866.7 871.3 871.1 871.2 867.6 MAX. QFE PRESSURE IN HPA 874.9 872.9 873.2 873.7 870.2 868.4 866.9 866.8 870.6 875.1 876.4 875.4 876.4 DAY 21 16 29 21 9 15 19 28 26 12 23 7 MIN. QFE PRESSURE IN HPA 862.1 862.8 862.6 864.8 859.8 859.8 859.0 858.2 863.9 866.8 865.7 864.0 858.2 DAY 3 9 24 29 5 29 5 8 5 20 8 23 MEAN QNH PRESSURE IN HPA 1020.3 1018.8 1019.6 1020.4 1017.9 1014.6 1012.7 1013.7 1017.6 1022.8 1022.7 1022.7 1018.6 MAX. QNH PRESSURE IN HPA 1027.0 1024.7 1025.0 1025.6 1021.6 1019.6 1017.9 1017.7 1022.1 1027.2 1028.7 1027.5 1028.7 DAY 21 16 29 21 9 15 19 28 26 12 23 7 MIN. QNH PRESSURE IN HPA 1012.4 1013.2 1013.0 1015.5 1009.8 1009.8 1008.9 1007.9 1014.4 1017.7 1016.5 1014.6 1007.9 DAY 3 9 24 29 5 29 5 8 5 20 8 23 MEAN QFF PRESSURE IN HPA 1021.3 1020.0 1017.7 1014.5 1009.8 1003.7 999.7 1001.3 1007.7 1015.8 1019.6 1020.7 1012.6 MAX. QFF PRESSURE IN HPA 1028.8 1027.8 1022.9 1022.3 1014.4 1010.3 1004.0 1006.0 1012.6 1022.8 1026.1 1029.6 1029.6 DAY 21 14 27 5 9 3 19 27 26 23 23 27 MIN. QFF PRESSURE IN HPA 1010.7 1012.8 1009.6 1008.6 1005.8 998.7 996.3 994.3 1003.4 1009.9 1012.1 1012.6 994.3 DAY 3 1 23 30 3 19 5 8 11 20 5 23 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 867.9 866.6 867.4 868.2 866.2 863.4 861.9 862.7 865.9 870.6 870.1 870.2 866.8 MAX. QFE PRESSURE IN HPA 873.0 871.6 872.0 872.6 869.6 867.7 865.9 866.2 869.5 874.2 875.5 874.3 875.5 DAY 21 14 28 21 9 6 19 28 26 12 23 7 MIN. QFE PRESSURE IN HPA 861.0 861.7 861.4 863.8 859.4 859.7 858.6 858.6 863.1 866.2 864.9 861.6 858.6 DAY 22 8 23 29 5 20 5 8 5 20 8 23 MEAN QNH PRESSURE IN HPA 1019.0 1017.5 1018.4 1019.3 1017.1 1013.9 1012.1 1013.1 1016.7 1022.0 1021.5 1021.6 1017.7 MAX. QNH PRESSURE IN HPA 1024.8 1023.2 1023.7 1024.3 1020.9 1018.8 1016.7 1017.1 1020.8 1026.2 1027.7 1026.3 1027.7 DAY 21 14 28 21 9 6 19 28 26 12 23 7 MIN. QNH PRESSURE IN HPA 1011.1 1011.9 1011.6 1014.3 1009.3 1009.7 1008.4 1008.4 1013.5 1017.1 1015.6 1011.8 1008.4 DAY 22 8 23 29 5 20 5 8 5 20 8 23 MEAN QFF PRESSURE IN HPA 1020.0 1018.8 1016.6 1013.5 1009.3 1003.3 999.4 1000.9 1007.2 1015.3 1018.8 1019.5 1011.9 MAX. QFF PRESSURE IN HPA 1026.9 1027.0 1021.8 1021.2 1014.2 1010.0 1003.1 1005.8 1012.2 1022.6 1025.2 1027.6 1027.6 DAY 12 14 28 5 6 3 19 29 30 22 23 27 MIN. QFF PRESSURE IN HPA 1011.6 1010.9 1006.9 1007.7 1005.7 998.2 995.8 995.7 1003.1 1010.1 1011.1 1009.7 995.7 DAY 3 1 23 29 18 19 5 8 11 20 5 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 868.3 866.8 867.6 867.9 865.7 863.1 861.7 862.5 866.1 870.7 870.4 870.7 866.8 MAX. QFE PRESSURE IN HPA 873.6 871.7 872.1 872.1 869.3 867.4 866.1 865.7 869.2 874.3 875.5 874.7 875.5 DAY 21 15 28 21 9 6 19 27 26 12 23 7 MIN. QFE PRESSURE IN HPA 859.5 860.9 861.2 863.2 859.8 859.3 858.8 859.1 863.5 866.2 865.7 862.1 858.8 DAY 22 8 23 29 5 28 5 7 5 20 8 23 MEAN QNH PRESSURE IN HPA 1019.4 1017.7 1018.6 1019.0 1016.5 1013.6 1012.0 1012.9 1016.9 1022.1 1021.8 1022.2 1017.7 MAX. QNH PRESSURE IN HPA 1025.5 1023.3 1023.8 1023.8 1020.6 1018.4 1016.9 1016.5 1020.5 1026.3 1027.7 1026.7 1027.7 DAY 21 15 28 21 9 6 19 27 26 12 23 7 MIN. QNH PRESSURE IN HPA 1009.4 1011.0 1011.4 1013.6 1009.8 1009.2 1008.6 1009.0 1014.0 1017.1 1016.5 1012.4 1008.6 DAY 22 8 23 29 5 28 5 7 5 20 8 23 MEAN QFF PRESSURE IN HPA 1021.4 1020.0 1017.5 1013.9 1009.1 1003.3 999.8 1001.5 1008.4 1016.5 1020.3 1021.6 1012.8 MAX. QFF PRESSURE IN HPA 1028.9 1028.6 1023.6 1021.8 1014.3 1009.8 1003.9 1006.4 1013.5 1024.3 1027.5 1028.4 1028.9 DAY 12 14 26 5 6 3 19 27 30 22 23 28 MIN. QFF PRESSURE IN HPA 1011.2 1012.2 1007.3 1007.6 1005.4 998.9 997.3 996.3 1004.0 1010.5 1011.3 1010.4 996.3 DAY 22 1 23 29 25 26 4 7 11 20 5 23 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 868.9 867.4 868.5 868.9 866.6 864.0 862.6 863.5 867.1 871.3 871.0 871.4 867.6 MAX. QFE PRESSURE IN HPA 873.5 872.1 873.4 873.0 870.1 868.3 867.1 866.5 870.0 875.1 875.6 875.6 875.6 DAY 1 14 28 21 9 6 19 28 30 12 23 7 MIN. QFE PRESSURE IN HPA 858.7 861.8 861.5 864.2 861.7 860.2 859.8 859.8 864.6 866.7 866.1 862.7 858.7 DAY 22 8 23 29 2 28 5 8 5 20 16 23 MEAN QNH PRESSURE IN HPA 1020.1 1018.5 1019.7 1020.1 1017.5 1014.6 1013.0 1014.0 1018.1 1022.9 1022.5 1022.9 1018.7 MAX. QNH PRESSURE IN HPA 1025.4 1023.8 1025.3 1024.8 1021.5 1019.5 1018.1 1017.4 1021.4 1027.2 1027.8 1027.8 1027.8 DAY 1 14 28 21 9 6 19 28 30 12 23 7 MIN. QNH PRESSURE IN HPA 1008.5 1012.0 1011.7 1014.8 1011.9 1010.2 1009.8 1009.8 1015.2 1017.6 1016.9 1013.1 1008.5 DAY 22 8 23 29 2 28 5 8 5 20 16 23 MEAN QFF PRESSURE IN HPA 1022.0 1020.7 1018.3 1014.6 1009.4 1003.4 999.9 1001.7 1008.5 1016.6 1020.7 1022.3 1013.2 MAX. QFF PRESSURE IN HPA 1029.1 1029.4 1023.2 1022.2 1014.5 1009.6 1004.2 1005.9 1014.3 1023.9 1027.1 1029.5 1029.5 DAY 12 14 26 5 6 3 19 29 30 22 23 27 MIN. QFF PRESSURE IN HPA 1010.0 1012.3 1008.1 1007.6 1004.3 998.3 997.3 996.9 1004.5 1009.2 1013.4 1011.1 996.9 DAY 22 1 23 25 2 26 4 8 11 19 7 23 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 868.7 867.4 868.5 868.8 866.5 863.8 862.5 863.4 866.8 871.1 870.9 871.2 867.5 MAX. QFE PRESSURE IN HPA 873.0 872.6 873.3 873.2 870.0 867.9 866.5 866.8 870.3 875.3 875.2 875.1 875.3 DAY 20 14 28 20 16 14 19 26 30 10 22 7 MIN. QFE PRESSURE IN HPA 857.3 861.7 861.9 864.3 860.4 859.0 859.8 859.2 864.0 866.9 866.3 862.7 857.3 DAY 22 8 23 29 2 28 4 7 5 19 7 23 MEAN QNH PRESSURE IN HPA 1020.0 1018.5 1019.7 1020.1 1017.4 1014.3 1012.9 1013.8 1017.7 1022.7 1022.5 1022.7 1018.5 MAX. QNH PRESSURE IN HPA 1024.8 1024.3 1025.1 1025.0 1021.4 1019.0 1017.4 1017.7 1021.7 1027.4 1027.3 1027.2 1027.4 DAY 20 14 28 20 16 14 19 26 30 10 22 7 MIN. QNH PRESSURE IN HPA 1006.9 1011.9 1012.2 1014.9 1010.5 1008.9 1009.8 1009.1 1014.6 1017.9 1017.2 1013.1 1006.9 DAY 22 8 23 29 2 28 4 7 5 19 7 23 MEAN QFF PRESSURE IN HPA 1020.9 1019.7 1017.7 1014.1 1009.3 1003.3 999.7 1001.4 1007.9 1015.6 1019.4 1020.7 1012.5 MAX. QFF PRESSURE IN HPA 1027.7 1029.6 1023.0 1022.2 1014.0 1010.1 1003.8 1005.5 1014.9 1023.2 1024.7 1030.0 1030.0 DAY 12 14 26 4 6 3 19 26 30 22 23 26 MIN. QFF PRESSURE IN HPA 1009.4 1013.9 1008.4 1007.5 1001.7 998.3 996.7 995.8 1004.2 1008.7 1012.5 1011.2 995.8 DAY 22 28 23 25 2 28 4 8 11 19 7 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 M CLIMATOLOGICAL NORMALS FOR THE PERIOD 1986-2005 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 4.4 5.2 9.1 15.2 21.2 26.8 30.3 29.9 25.6 19.4 11.5 6.8 17.1 MINIMUN AIR TEMPERATURE (C) 0.5 1.0 4.4 9.7 14.8 19.5 23.0 22.7 18.6 13.8 6.9 2.8 11.5 DAYS WITH MINIMUM TEMP. >=21 0.0 0.0 0.0 0.0 1.2 8.9 25.1 22.8 5.9 0.2 0.0 0.0 64.1 DAYS WITH MINIMUM TEMP. <=-4 2.7 2.1 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.0 6.4 DAYS WITH FREEZING MIN.<= 0 13.6 10.2 2.9 0.2 0.0 0.0 0.0 0.0 0.0 0.0 1.2 6.8 34.9 TEMPERATURE RECORDS LOWEST(C) -12.6 -13.6 -7.6 -3.0 2.0 11.8 16.8 14.3 11.0 1.8 -6.2 -12.0 -13.6 YEAR-DAY 92- 4 5-11 97- 8 97-11 5- 6 4- 3 3- 9 87-27 3-14 5-23 93-14 88-29 5-11 MAXIMUM AIR TEMPERATURE (C) 8.8 9.9 13.8 20.1 26.5 32.4 35.9 35.7 31.5 24.9 16.6 11.3 22.3 DAYS WITH MAXIMUM TEMP. >=30 0.0 0.0 0.0 0.1 6.3 24.8 30.8 30.9 23.4 1.9 0.0 0.0 118.2 DAYS WITH MAXIMUM TEMP. <= 0 0.4 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.8 TEMPERATURE RECORDS HIGHEST(C) 20.8 21.0 24.6 30.6 36.6 39.6 40.6 40.6 37.4 32.2 25.4 24.0 40.6 YEAR-DAY 0- 1 4-29 4- 5 5-23 99-31 0-30 89-20 1- 4 98- 1 99- 2 1- 4 98-10 89-20 DIF. BETWEEN (MAX.-MIN.) (C) 8.3 8.9 9.4 10.4 11.7 12.9 12.9 13.0 12.9 11.1 9.7 8.5 10.8 MEAN DAILY TEMP. (MDT) (C) 4.7 5.5 9.1 14.9 20.6 25.9 29.5 29.2 25.1 19.3 11.7 7.1 16.9 STANDARD DEVIATION OF MDT(C) 1.91 1.81 1.98 1.46 1.35 0.98 1.02 1.16 0.87 1.06 1.42 2.20 1.43 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 1.5 37.7 149.0 262.2 253.5 123.0 15.7 0.0 0.0 842.6 HEATING DEG. DAYS(BASE 18 0C) 411.3 354.5 274.8 103.8 15.1 0.0 0.0 0.0 0.0 20.9 187.9 338.3 1706.6 DEWPOINT (MEAN C) -2.5 -2.6 -0.6 1.9 1.7 1.0 2.9 2.5 -0.2 0.8 0.4 -1.4 0.3 MIXING RATIO (G/KG) 3.88 3.85 4.51 5.37 5.28 5.02 5.74 5.57 4.58 5.01 4.91 4.23 4.83 VAPOUR PRESSURE (HPA) 5.37 5.31 6.20 7.38 7.26 6.89 7.84 7.63 6.31 6.92 6.78 5.85 6.64 SATURATION DEF. (HPA) 3.31 3.92 5.85 10.57 19.03 29.60 36.57 35.83 27.67 16.53 7.35 4.42 16.72 RELATIVE HUMIDITY (MEAN %) 65 61 56 45 31 21 19 19 20 33 51 61 40 RELATIVE HUMIDITY (MAX. %) 81 78 74 64 45 31 28 28 30 45 67 76 54 RELATIVE HUMIDITY (MIN. %) 47 42 38 30 20 13 12 12 13 22 35 43 27 RELATIVE HUMIDITY (MEAN% 03UTC) 70 68 64 55 40 28 26 26 27 40 58 67 47 RELATIVE HUMIDITY (MEAN% 09UTC) 53 48 43 35 23 15 14 13 14 24 38 48 31 RELATIVE HUMIDITY (MEAN% 15UTC) 70 61 53 41 26 16 15 15 17 32 54 65 39 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 116.0 90.1 122.6 62.9 17.5 0.2 0.5 0.1 0.2 23.2 84.1 98.6 616.0 DAYS WITH PRECIPITATION >=10 3.9 3.2 3.9 2.0 0.6 0.0 0.0 0.0 0.0 1.0 2.4 3.5 20.5 DAYS WITH PRECIPITATION >= 5 6.3 5.3 6.2 3.7 1.0 0.0 0.0 0.0 0.0 1.4 3.7 5.4 33.0 DAYS WITH PRECIPITATION >= 1 9.7 8.8 9.4 7.3 2.8 0.2 0.2 0.1 0.2 2.9 5.8 8.1 55.5 DAYS WITH PRECIPITATION 12.1 11.2 12.2 9.9 5.4 0.5 0.5 0.2 0.4 5.0 8.0 10.3 75.7 GREATEST DAILY PRECIPITATION 81.0 86.0 79.0 55.0 35.0 1.0 4.0 1.0 1.0 32.0 103.0 56.0 103.0 YEAR-DAY 94-16 91-26 5-11 96-13 93-13 93- 1 96-17 87- 1 94-22 90-28 94-23 87-23 94 DAY WITH THUNDER STORM 2.6 3.2 4.2 4.9 3.3 0.5 0.3 0.2 0.4 2.6 4.0 2.7 28.9 DAYS WITH SNOW OR SLEET 6.0 3.7 1.8 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.3 2.2 14.3 DAYS WITH DUST 0.3 0.6 1.2 1.5 3.1 2.8 3.1 1.5 1.2 0.9 0.2 0.1 16.5 WIND DIRECTION (PREVAILING) 180 135 180 270 270 270 270 270 270 270 135 180 270 PREVAILING WIND SPEED(KNOTS) 7.6 7.5 9.0 7.5 8.7 9.1 8.8 8.6 8.3 7.1 6.9 7.5 8.1 PREVAILING WIND PERCENT 13.1 13.0 13.9 11.8 14.2 18.1 19.2 17.9 17.1 10.9 12.0 12.2 11.8 CALMS PERCENT OF WIND 55.8 48.8 43.8 42.8 39.0 37.6 38.3 39.9 42.6 48.0 52.8 57.5 45.6 NO. OF WIND OBSERVATION 225.5 210.0 231.7 224.2 226.4 219.0 221.6 221.6 214.5 221.3 215.8 226.3 2657.9 VECTOR WIND DIRECTION (MEAN) 157 167 183 194 244 286 279 282 278 208 165 162 223 VECTOR WIND MAGNITUDE(KNOTS) 1.6 1.8 2.0 1.6 1.2 2.4 2.2 2.3 1.9 1.0 1.5 1.5 1.1 WIND STEADINESES (MEAN %) 53.3 47.4 44.4 36.4 24.5 45.3 43.1 46.0 43.2 27.0 48.4 53.6 26.2 WIND SPEED (MEAN KNOTS) 3.0 3.8 4.5 4.4 4.9 5.3 5.1 5.0 4.4 3.7 3.1 2.8 4.2 FASTEST WIND DIRECTION 120 100 90 180 60 10 90 330 200 190 120 160 120 FASTEST WIND SPEED (KNOTS) 43 41 39 43 35 39 31 29 39 35 39 43 43 YEAR-DAY 1- 3 95-15 90-21 3-26 89- 1 98-17 0-27 1-12 1-28 1-25 98-11 90-24 1 DAYS WITH SKY CLEAR (0-2)/8 12.7 12.1 12.3 10.9 17.8 27.9 28.5 29.0 28.3 20.3 14.9 11.8 226.5 DAYS WITH P.CLOUDY (3-6)/8 9.1 8.9 9.9 11.6 9.3 1.8 2.3 2.0 1.6 7.8 8.6 10.6 83.5 DAYS WITH CLOUDY (7-8)/8 9.2 7.3 8.7 7.1 3.8 0.3 0.1 0.0 0.1 2.8 6.5 8.5 54.4 DAYS WITH VISIBILITY =< 2 KM 4.3 2.8 2.1 0.8 0.7 0.5 0.7 0.4 0.1 0.2 1.1 1.9 15.6 DURATION OF SUNSHINE HOURS 174.3 179.6 213.2 236.7 300.4 350.9 361.2 353.4 309.5 258.9 204.7 171.5 3114.3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 865.4 864.5 863.5 864.0 863.3 860.3 858.2 860.0 863.7 867.1 867.4 867.0 863.7 MAX. QFE PRESSURE IN HPA 877.6 876.5 874.8 874.8 872.0 869.9 867.1 867.0 873.1 875.7 877.3 877.1 877.6 YEAR-DAY 3- 7 4- 8 4-23 5-21 3-11 3- 4 5-19 4-29 4-25 4-15 3-25 4- 3 3- 7 MIN. QFE PRESSURE IN HPA 849.3 851.0 848.0 852.2 853.2 853.2 851.1 853.5 855.1 859.2 853.9 851.0 848.0 YEAR-DAY 92-30 90-10 89-10 90- 2 86- 3 97-30 99-13 86- 5 0- 3 86- 1 1-18 88-27 89-10 MEAN QNH PRESSURE IN HPA 1016.2 1015.1 1014.0 1014.6 1013.7 1010.4 1007.9 1009.9 1014.2 1018.1 1018.5 1018.0 1014.2 MAX. QNH PRESSURE IN HPA 1030.0 1028.8 1026.9 1026.9 1023.7 1021.3 1018.1 1018.0 1024.9 1027.9 1029.7 1029.5 1030.0 YEAR-DAY 3- 7 4- 8 4-23 5-21 3-11 3- 4 5-19 4-29 4-25 4-15 3-25 4- 3 3- 7 MIN. QNH PRESSURE IN HPA 997.8 999.7 996.3 1001.1 1002.2 1002.2 999.9 1002.6 1004.4 1009.1 1003.0 999.7 996.3 YEAR-DAY 92-30 90-10 89-10 90- 2 86- 3 97-30 99-13 86- 5 0- 3 86- 1 1-18 88-27 89-10 MEAN QFF PRESSURE IN HPA 1017.3 1016.0 1012.3 1009.6 1005.5 999.5 995.4 997.6 1004.0 1011.0 1015.9 1017.7 1008.5 MAX. QFF PRESSURE IN HPA 1034.4 1031.6 1029.6 1022.7 1017.5 1013.0 1006.6 1006.8 1015.0 1024.7 1032.3 1033.7 1034.4 YEAR-DAY 92- 4 4- 8 3- 2 5- 5 3- 1 3- 4 3- 3 4-23 4-30 5-23 4-29 4-18 92- 4 MIN. QFF PRESSURE IN HPA 999.9 1000.1 992.0 996.9 994.2 989.6 985.8 989.7 994.3 1000.8 1000.3 1000.0 985.8 YEAR-DAY 97-16 90-10 89-10 90- 2 1-29 97-29 99-12 2-14 0- 3 1- 1 1-18 88-26 99-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 865.4 864.5 863.4 863.6 862.8 860.2 858.1 859.9 863.3 866.9 867.8 867.2 863.6 MAX. QFE PRESSURE IN HPA 876.8 875.8 873.8 872.4 870.8 869.0 865.7 866.2 871.8 874.7 875.9 876.2 876.8 YEAR-DAY 3- 7 4- 9 4-24 5-21 3-11 3- 4 3- 3 5-28 4-27 4-15 3-26 4- 4 3- 7 MIN. QFE PRESSURE IN HPA 851.7 852.0 851.3 852.2 856.2 853.2 852.0 854.6 855.1 860.2 856.0 854.9 851.3 YEAR-DAY 97-16 90-10 1-25 90- 2 1-30 97-30 99-12 89- 2 0- 3 0- 2 1-18 2-21 1-25 MEAN QNH PRESSURE IN HPA 1016.2 1015.1 1013.9 1014.1 1013.2 1010.3 1007.8 1009.8 1013.8 1017.8 1018.9 1018.1 1014.1 MAX. QNH PRESSURE IN HPA 1029.1 1028.0 1025.7 1024.1 1022.3 1020.3 1016.5 1017.1 1023.4 1026.7 1028.1 1028.5 1029.1 YEAR-DAY 3- 7 4- 9 4-24 5-21 3-11 3- 4 3- 3 5-28 4-27 4-15 3-26 4- 4 3- 7 MIN. QNH PRESSURE IN HPA 1000.5 1000.9 1000.1 1001.1 1005.7 1002.2 1000.9 1003.8 1004.4 1010.2 1005.4 1004.2 1000.1 YEAR-DAY 97-16 90-10 1-25 90- 2 1-30 97-30 99-12 89- 2 0- 3 0- 2 1-18 2-21 1-25 MEAN QFF PRESSURE IN HPA 1017.0 1015.5 1012.0 1009.0 1005.0 999.1 995.0 997.1 1003.3 1010.2 1015.3 1017.3 1008.0 MAX. QFF PRESSURE IN HPA 1029.2 1029.0 1026.7 1021.0 1017.5 1011.8 1005.8 1005.7 1013.1 1023.2 1030.8 1030.8 1030.8 YEAR-DAY 3- 7 4- 9 3- 2 5- 5 3- 1 3- 5 3- 3 4-29 4-27 5-23 4-29 5-27 4-29 MIN. QFF PRESSURE IN HPA 999.9 1000.6 997.3 996.9 994.3 989.8 986.7 989.9 994.3 1000.8 1001.8 1003.4 986.7 YEAR-DAY 97-16 90-10 1-25 90- 2 97-31 97-29 99-12 99- 4 0- 3 1- 1 1-18 2-21 99-12 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 865.2 864.3 863.2 863.7 863.1 860.2 857.9 859.7 863.4 866.9 867.4 866.9 863.5 MAX. QFE PRESSURE IN HPA 876.6 875.4 873.8 872.6 871.5 868.8 866.2 866.3 871.9 875.0 876.4 876.2 876.6 YEAR-DAY 3- 7 4- 9 4-24 5-21 3-11 3- 4 3- 3 4-29 4-27 4-15 3-26 4- 4 3- 7 MIN. QFE PRESSURE IN HPA 852.7 851.0 850.4 854.3 856.2 853.3 852.0 854.4 855.3 860.0 854.7 851.0 850.4 YEAR-DAY 97-16 90-10 97-29 90- 2 1-30 97-29 99-12 94- 1 0- 3 87-23 1-18 88-27 97-29 MEAN QNH PRESSURE IN HPA 1016.0 1014.8 1013.7 1014.2 1013.5 1010.3 1007.6 1009.7 1013.8 1017.8 1018.5 1017.8 1014.0 MAX. QNH PRESSURE IN HPA 1028.9 1027.5 1025.7 1024.3 1023.1 1020.0 1017.1 1017.2 1023.6 1027.1 1028.7 1028.5 1028.9 YEAR-DAY 3- 7 4- 9 4-24 5-21 3-11 3- 4 3- 3 4-29 4-27 4-15 3-26 4- 4 3- 7 MIN. QNH PRESSURE IN HPA 1001.7 999.7 999.1 1003.5 1005.7 1002.4 1000.9 1003.6 1004.6 1010.0 1004.0 999.7 999.1 YEAR-DAY 97-16 90-10 97-29 90- 2 1-30 97-29 99-12 94- 1 0- 3 87-23 1-18 88-27 97-29 MEAN QFF PRESSURE IN HPA 1017.5 1015.9 1012.4 1009.6 1005.6 999.5 995.2 997.6 1004.1 1011.3 1016.0 1018.0 1008.6 MAX. QFF PRESSURE IN HPA 1030.3 1030.3 1028.4 1022.5 1016.7 1012.0 1006.6 1006.7 1014.3 1024.7 1032.3 1032.5 1032.5 YEAR-DAY 92- 4 4- 8 3- 2 5- 5 3-11 3- 2 3- 3 4-29 4-27 5-23 4-29 4-18 4-18 MIN. QFF PRESSURE IN HPA 1000.8 1000.1 995.6 999.4 996.0 989.6 986.6 990.5 995.1 1001.3 1000.5 1000.0 986.6 YEAR-DAY 97-16 90-10 0-24 0-21 1-30 97-29 99-12 2-14 0- 2 1- 1 1-18 88-26 99-12 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ILAM (40780) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 38 N LONGITUDE 46 26 E DATA PROCESSING CENTER ELEVATION 1337.0 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 866.0 865.1 864.1 864.5 863.8 860.7 858.4 860.3 864.2 867.8 868.2 867.7 864.2 MAX. QFE PRESSURE IN HPA 877.6 876.0 874.8 874.8 872.0 869.7 866.5 867.0 873.1 875.7 877.1 877.1 877.6 YEAR-DAY 3- 7 4- 9 4-23 5-21 3-11 3- 4 5-19 4-29 4-25 4-15 3-25 4- 3 3- 7 MIN. QFE PRESSURE IN HPA 853.7 853.5 848.9 855.2 855.3 854.2 852.1 854.4 856.1 860.6 853.9 852.2 848.9 YEAR-DAY 96-12 90-10 97-29 90- 2 86- 4 97-29 99-13 86- 5 0- 2 86- 1 1-18 88-26 97-29 MEAN QNH PRESSURE IN HPA 1016.9 1015.8 1014.7 1015.1 1014.3 1010.8 1008.2 1010.4 1014.8 1018.9 1019.3 1018.8 1014.8 MAX. QNH PRESSURE IN HPA 1030.0 1028.2 1026.9 1026.9 1023.7 1021.0 1017.4 1018.0 1024.9 1027.9 1029.5 1029.5 1030.0 YEAR-DAY 3- 7 4- 9 4-23 5-21 3-11 3- 4 5-19 4-29 4-25 4-15 3-25 4- 3 3- 7 MIN. QNH PRESSURE IN HPA 1002.8 1002.6 997.4 1004.5 1004.6 1003.4 1001.0 1003.6 1005.6 1010.7 1003.0 1001.1 997.4 YEAR-DAY 96-12 90-10 97-29 90- 2 86- 4 97-29 99-13 86- 5 0- 2 86- 1 1-18 88-26 97-29 MEAN QFF PRESSURE IN HPA 1018.5 1017.0 1013.1 1010.2 1006.0 999.8 995.5 997.8 1004.5 1011.7 1016.9 1018.8 1009.1 MAX. QFF PRESSURE IN HPA 1033.8 1031.6 1029.6 1022.7 1017.5 1011.9 1005.2 1006.3 1014.7 1024.2 1031.9 1033.7 1033.8 YEAR-DAY 92- 4 4- 8 3- 2 5- 5 3- 1 3- 4 3- 3 4-29 4-27 5-23 4-29 4-18 92- 4 MIN. QFF PRESSURE IN HPA 1003.1 1002.5 995.5 999.3 996.1 990.6 987.3 990.2 995.3 1001.4 1000.3 1000.8 987.3 YEAR-DAY 96-12 88- 2 0-24 88-25 1-29 97-29 99-13 2-14 0- 2 1- 1 1-18 88-26 99-13 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 865.8 865.0 864.0 864.4 863.8 860.7 858.5 860.3 864.1 867.5 867.7 867.3 864.1 MAX. QFE PRESSURE IN HPA 877.6 876.5 874.6 873.7 871.6 869.9 866.9 866.8 872.2 875.2 876.7 876.8 877.6 YEAR-DAY 3- 7 4- 8 4- 9 5-21 3-11 3- 4 5-19 5-28 4-25 4-26 3-25 4- 3 3- 7 MIN. QFE PRESSURE IN HPA 851.5 854.6 849.3 855.7 856.0 854.2 851.6 854.0 855.7 860.6 854.6 852.2 849.3 YEAR-DAY 92-30 90-15 97-29 2- 3 86- 4 99-24 99-13 86- 5 0- 2 86- 1 1-18 88-26 97-29 MEAN QNH PRESSURE IN HPA 1016.6 1015.7 1014.6 1015.1 1014.4 1010.8 1008.3 1010.3 1014.6 1018.5 1018.8 1018.3 1014.7 MAX. QNH PRESSURE IN HPA 1030.0 1028.8 1026.6 1025.6 1023.2 1021.3 1017.9 1017.7 1023.9 1027.3 1029.0 1029.1 1030.0 YEAR-DAY 3- 7 4- 8 4- 9 5-21 3-11 3- 4 5-19 5-28 4-25 4-26 3-25 4- 3 3- 7 MIN. QNH PRESSURE IN HPA 1000.3 1003.8 997.8 1005.1 1005.4 1003.4 1000.4 1003.2 1005.1 1010.7 1003.8 1001.1 997.8 YEAR-DAY 92-30 90-15 97-29 2- 3 86- 4 99-24 99-13 86- 5 0- 2 86- 1 1-18 88-26 97-29 MEAN QFF PRESSURE IN HPA 1017.4 1016.2 1012.7 1009.9 1006.0 999.8 995.6 997.8 1004.1 1011.0 1015.7 1017.5 1008.7 MAX. QFF PRESSURE IN HPA 1033.2 1031.1 1027.8 1022.3 1017.1 1013.0 1004.7 1006.1 1013.8 1022.8 1029.3 1032.3 1033.2 YEAR-DAY 92- 4 4- 8 3- 2 5- 5 3- 1 3- 4 3- 3 3-29 4-24 5-23 4-28 4-18 92- 4 MIN. QFF PRESSURE IN HPA 1003.0 1002.5 994.4 1000.8 996.2 990.6 986.1 989.9 994.8 1001.2 1002.9 1002.7 986.1 YEAR-DAY 92-30 92-24 89-10 97-27 1-29 97-29 99-13 2-14 0- 2 1- 1 1-17 2-21 99-13 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 864.7 863.9 863.0 863.7 863.1 860.2 858.0 859.7 863.3 866.6 866.8 866.4 863.3 MAX. QFE PRESSURE IN HPA 876.4 875.9 873.5 872.6 870.8 868.9 865.9 866.2 871.0 874.2 876.0 875.7 876.4 YEAR-DAY 3- 7 4- 8 4-23 5-21 3-10 3- 4 5-19 5-28 4-26 5-12 3-25 4- 3 3- 7 MIN. QFE PRESSURE IN HPA 849.3 853.8 848.0 855.2 853.8 853.7 851.4 854.0 855.5 859.2 855.5 851.5 848.0 YEAR-DAY 92-30 90-15 89-10 88-25 1- 2 97-29 99-13 86- 5 0- 2 86- 1 1-18 88-26 89-10 MEAN QNH PRESSURE IN HPA 1015.4 1014.4 1013.4 1014.2 1013.6 1010.2 1007.7 1009.6 1013.7 1017.5 1017.8 1017.3 1013.7 MAX. QNH PRESSURE IN HPA 1028.7 1028.1 1025.4 1024.3 1022.3 1020.1 1016.7 1017.1 1022.5 1026.2 1028.2 1027.9 1028.7 YEAR-DAY 3- 7 4- 8 4-23 5-21 3-10 3- 4 5-19 5-28 4-26 5-12 3-25 4- 3 3- 7 MIN. QNH PRESSURE IN