STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 **** **** **** **** 147 180 157 155 150 155 150 155 1249 VECTOR WIND DIRECTION (MEAN) *** *** *** *** 309 287 264 239 231 253 333 146 *** VECTOR WIND MAGNITUDE(KNOTS) **** **** **** **** 1.7 7.4 4.3 1.9 1.7 2.1 1.0 0.3 **** WIND STEADINESES (MEAN %) ***** ***** ***** ***** 25.4 91.4 70.5 46.3 47.2 41.2 16.4 6.3 ***** WIND SPEED (MEAN KNOTS) **** **** **** **** 6.7 8.1 6.1 4.1 3.6 5.1 6.1 4.8 **** FASTEST WIND DIRECTION *** *** *** *** 10 300 300 300 310 200 170 110 *** FASTEST WIND SPEED (KNOTS) *** *** *** *** 23 23 16 12 16 19 19 23 *** DAY ** ** ** ** 21 30 1 26 29 1 8 27 DAYS WITH SKY CLEAR (0-2)/8 **** **** **** **** 9 27 29 31 29 23 16 19 **** DAYS WITH P.CLOUDY (3-6)/8 **** **** **** **** 11 3 2 0 1 7 8 8 **** DAYS WITH CLOUDY (7-8)/8 **** **** **** **** 5 0 0 0 0 1 6 4 **** DAYS WITH VISIBILITY =< 2 KM **** **** **** **** 0 0 2 1 0 2 3 7 **** DURATION OF SUNSHINE HOURS ****** ****** ****** ****** 145.6 331.9 331.3 316.1 303.0 243.1 209.9 196.4 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 M MEANS AND EXTREMES FOR THE YEAR 1986 JAN. 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QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 ****** ****** ****** ****** 1006.0 998.5 995.8 997.5 1005.2 1010.6 1014.9 1018.3 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** 1012.4 1007.6 998.8 1002.0 1010.5 1015.0 1021.0 1024.2 ****** DAY ** ** ** ** 18 2 27 29 22 20 15 3 MIN. 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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 BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 M MEANS AND EXTREMES FOR THE YEAR 1987 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 12.9 17.0 18.0 25.0 31.9 35.3 37.8 37.5 33.9 26.7 19.9 13.9 25.8 MINIMUN AIR TEMPERATURE (C) 4.8 8.0 12.6 16.4 22.4 22.4 23.7 23.6 19.7 17.4 10.2 7.0 15.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 6 24 23 29 23 8 9 0 0 122 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 1 0 0 0 0 0 0 0 0 0 0 2 3 TEMPERATURE RECORDS LOWEST(C) 0.0 3.0 6.0 9.5 18.0 18.0 19.8 16.4 15.0 9.4 4.8 -1.6 -1.6 DAY 2 13 22 22 8 6 11 28 24 29 12 30 MAXIMUM AIR TEMPERATURE (C) 19.6 23.6 22.5 30.7 38.8 42.8 45.7 45.3 42.1 32.7 27.2 19.2 32.5 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 17 31 30 31 31 30 22 9 0 201 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 24.4 28.2 28.5 40.5 42.0 49.2 49.2 50.8 45.4 40.4 32.2 25.2 50.8 DAY 31 2 8 30 29 29 25 14 7 3 14 1 DIF. BETWEEN (MAX.-MIN.) (C) 14.8 15.6 9.9 14.3 16.4 20.4 22.0 21.7 22.4 15.3 17.0 12.2 16.8 MEAN DAILY TEMP. (MDT) (C) 12.2 15.8 17.6 23.5 30.6 32.6 34.7 34.5 30.9 25.1 18.7 13.1 24.1 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 1.4 94.0 297.6 347.7 424.2 417.7 296.7 125.5 11.0 0.0 2015.9 HEATING DEG. DAYS(BASE 18 0C) 172.5 65.4 38.5 0.3 0.0 0.0 0.0 0.0 0.0 0.1 29.0 154.1 459.8 DEWPOINT (MEAN C) 4.9 6.1 9.4 9.9 16.6 14.5 14.8 18.5 15.0 15.1 7.8 6.3 11.6 MIXING RATIO (G/KG) 5.53 6.05 7.64 7.89 12.54 10.80 11.11 14.48 11.41 11.22 6.80 6.36 9.32 VAPOUR PRESSURE (HPA) 8.98 9.78 12.28 12.67 19.89 17.11 17.52 22.73 18.18 18.03 11.06 10.35 14.88 SATURATION DEF. (HPA) 6.76 10.78 8.96 20.49 29.31 43.63 52.32 46.66 38.99 19.37 13.79 6.43 24.79 RELATIVE HUMIDITY (MEAN %) 63 54 60 41 43 32 29 36 36 53 51 67 47 RELATIVE HUMIDITY (MAX. %) 90 84 81 64 62 49 48 54 58 74 76 87 69 RELATIVE HUMIDITY (MIN. %) 39 31 43 26 27 21 17 25 24 41 31 47 31 RELATIVE HUMIDITY (MEAN% 03UTC) 89 82 80 61 60 48 47 53 58 73 75 85 68 RELATIVE HUMIDITY (MEAN% 09UTC) 50 42 54 31 35 25 23 28 27 45 38 59 38 RELATIVE HUMIDITY (MEAN% 15UTC) 54 47 53 40 43 29 24 34 34 51 51 66 44 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 0.2 9.4 37.5 3.7 0.4 0.0 0.0 2.0 0.0 22.0 5.7 31.6 112.5 DAYS WITH PRECIPITATION >=10 0 0 0 0 0 0 0 0 0 0 0 1 1 DAYS WITH PRECIPITATION >= 5 0 1 3 0 0 0 0 0 0 1 1 3 9 DAYS WITH PRECIPITATION >= 1 0 2 9 2 0 0 0 1 0 7 1 7 29 DAYS WITH PRECIPITATION 2 5 12 6 1 0 0 1 0 8 2 7 44 GREATEST DAILY PRECIPITATION 0.2 7.0 8.0 2.0 0.4 0.0 0.0 2.0 0.0 6.0 5.0 10.0 10.0 DAY 24 9 4 18 12 ** ** 11 ** 20 3 27 DAY WITH THUNDER STORM 0 1 3 1 0 0 0 0 0 6 1 0 12 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH DUST 2 2 6 2 5 10 11 12 6 4 3 1 64 WIND DIRECTION (PREVAILING) 270 270 135 270 270 270 270 270 270 90 270 270 270 PREVAILING WIND SPEED(KNOTS) 6.3 5.5 9.6 7.0 6.3 7.7 8.0 10.5 9.3 11.5 10.4 10.5 8.1 PREVAILING WIND PERCENT 27.7 15.7 20.2 16.4 26.3 40.0 36.8 34.2 28.7 18.7 24.0 19.4 24.8 CALMS PERCENT OF WIND 40.6 39.3 31.0 37.4 34.9 34.0 29.0 27.6 34.0 36.8 30.7 29.0 33.7 NO. OF WIND OBSERVATION 155 140 168 171 175 150 155 152 150 155 150 155 1876 VECTOR WIND DIRECTION (MEAN) 285 160 141 266 280 286 276 281 263 54 305 10 282 VECTOR WIND MAGNITUDE(KNOTS) 1.0 0.6 1.4 1.2 1.7 4.7 4.0 6.3 3.3 2.0 2.8 0.3 1.8 WIND STEADINESES (MEAN %) 22.7 14.3 25.5 22.2 35.4 82.5 69.0 80.8 56.9 31.3 40.6 4.2 31.0 WIND SPEED (MEAN KNOTS) 4.4 4.2 5.5 5.4 4.8 5.7 5.8 7.8 5.8 6.4 6.9 7.2 5.8 FASTEST WIND DIRECTION 80 120 180 130 10 300 120 300 290 130 300 80 120 FASTEST WIND SPEED (KNOTS) 23 19 17 23 19 19 31 29 21 25 31 25 31 DAY 23 8 4 15 4 3 31 26 7 24 11 13 DAYS WITH SKY CLEAR (0-2)/8 19 20 12 15 17 30 30 30 29 14 21 13 250 DAYS WITH P.CLOUDY (3-6)/8 7 7 12 14 11 0 1 1 1 7 8 11 80 DAYS WITH CLOUDY (7-8)/8 5 1 7 1 3 0 0 0 0 10 1 7 35 DAYS WITH VISIBILITY =< 2 KM 3 2 6 0 0 1 2 0 0 2 0 6 22 DURATION OF SUNSHINE HOURS 208.0 187.9 175.1 260.6 256.5 186.3 ****** ****** 279.3 184.7 237.9 151.7 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1020.1 1017.0 1013.0 1013.4 1008.4 1003.4 999.8 1003.2 1012.5 1019.3 1023.9 1025.5 1013.3 MAX. QFE PRESSURE IN HPA 1025.0 1023.4 1018.8 1021.5 1015.0 1008.2 1004.4 1010.7 1020.0 1025.4 1029.2 1032.1 1032.1 DAY-HOUR 12- 6 6- 9 15- 6 22- 6 12- 6 1- 9 30- 9 31- 9 30- 9 28- 6 30- 9 2- 6 MIN. QFE PRESSURE IN HPA 1008.8 1008.5 1002.7 1006.0 1003.0 998.9 993.0 995.8 1007.0 1011.1 1017.6 1016.5 993.0 DAY-HOUR 6-12 28-15 13-15 19- 3 21-15 8-15 27-15 13-15 11-15 4-12 7-12 27-12 MEAN QNH PRESSURE IN HPA 1020.8 1017.6 1013.7 1014.1 1009.0 1004.1 1000.4 1003.8 1013.1 1020.0 1024.5 1026.2 1013.9 MAX. QNH PRESSURE IN HPA 1025.6 1024.0 1019.4 1022.1 1015.6 1008.8 1005.0 1011.3 1020.6 1026.0 1029.8 1032.7 1032.7 DAY-HOUR 12- 6 6- 9 15- 6 22- 6 12- 6 1- 9 30- 9 31- 9 30- 9 28- 6 30- 9 2- 6 MIN. QNH PRESSURE IN HPA 1009.4 1009.1 1003.3 1006.6 1003.6 999.5 993.6 996.4 1007.6 1011.7 1018.2 1017.1 993.6 DAY-HOUR 6-12 28-15 13-15 19- 3 21-15 8-15 27-15 13-15 11-15 4-12 7-12 27-12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 1020.0 1016.8 1012.9 1013.6 1008.3 1003.2 999.4 1002.7 1012.0 1019.2 1023.6 1025.6 1013.1 MAX. QFE PRESSURE IN HPA 1023.6 1022.0 1017.3 1020.0 1013.8 1006.6 1002.4 1009.1 1017.2 1024.5 1027.0 1031.7 1031.7 DAY 12 7 15 22 13 1 9 31 30 28 30 2 MIN. QFE PRESSURE IN HPA 1012.2 1008.8 1006.3 1006.0 1004.0 1000.0 995.0 996.2 1007.2 1012.1 1018.2 1018.5 995.0 DAY 6 10 13 19 23 8 27 14 10 4 7 28 MEAN QNH PRESSURE IN HPA 1020.7 1017.4 1013.5 1014.2 1008.9 1003.8 1000.0 1003.3 1012.6 1019.8 1024.3 1026.2 1013.7 MAX. QNH PRESSURE IN HPA 1024.2 1022.6 1017.9 1020.6 1014.4 1007.2 1003.0 1009.7 1017.8 1025.1 1027.6 1032.3 1032.3 DAY 12 7 15 22 13 1 9 31 30 28 30 2 MIN. QNH PRESSURE IN HPA 1012.8 1009.4 1006.9 1006.6 1004.6 1000.6 995.6 996.8 1007.8 1012.7 1018.8 1019.1 995.6 DAY 6 10 13 19 23 8 27 14 10 4 7 28 MEAN QFF PRESSURE IN HPA 1021.0 1017.7 1013.8 1014.5 1009.2 1004.0 1000.2 1003.4 1012.9 1020.1 1024.6 1026.5 1014.0 MAX. QFF PRESSURE IN HPA 1024.6 1022.9 1017.9 1020.9 1014.7 1007.5 1003.3 1010.0 1018.1 1025.4 1027.9 1032.7 1032.7 DAY 12 7 24 22 13 1 9 31 30 28 30 2 MIN. QFF PRESSURE IN HPA 1013.1 1009.7 1007.2 1006.9 1004.9 1000.9 995.9 997.0 1008.1 1013.0 1019.1 1019.4 995.9 DAY 6 10 13 19 30 8 27 14 10 4 7 28 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1021.3 1018.1 1013.9 1014.8 1009.4 1004.3 1000.6 1004.1 1013.4 1020.5 1025.1 1026.8 1014.4 MAX. QFE PRESSURE IN HPA 1025.0 1023.0 1018.8 1021.5 1015.0 1008.0 1004.2 1010.5 1019.3 1025.4 1028.8 1032.1 1032.1 DAY 12 2 15 22 12 1 30 31 30 28 30 2 MIN. QFE PRESSURE IN HPA 1011.8 1009.8 1006.2 1007.8 1005.0 1001.0 995.3 997.5 1008.8 1013.6 1020.0 1019.4 995.3 DAY 6 9 4 19 30 8 27 14 10 4 7 28 MEAN QNH PRESSURE IN HPA 1022.0 1018.8 1014.6 1015.5 1010.1 1004.9 1001.3 1004.7 1014.1 1021.2 1025.8 1027.4 1015.0 MAX. QNH PRESSURE IN HPA 1025.6 1023.6 1019.4 1022.1 1015.6 1008.6 1004.8 1011.1 1019.9 1026.0 1029.4 1032.7 1032.7 DAY 12 2 15 22 12 1 30 31 30 28 30 2 MIN. QNH PRESSURE IN HPA 1012.4 1010.4 1006.8 1008.4 1005.6 1001.6 995.9 998.1 1009.4 1014.2 1020.6 1020.0 995.9 DAY 6 9 4 19 30 8 27 14 10 4 7 28 MEAN QFF PRESSURE IN HPA ****** ****** ****** 1014.9 1010.8 ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1022.4 1015.9 ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** 22 12 ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** 1008.7 1005.9 ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** 19 30 ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 1020.7 1017.9 1013.8 1014.3 1009.2 1004.3 1000.7 1004.3 1013.4 1020.0 1024.4 1026.2 1014.1 MAX. QFE PRESSURE IN HPA 1024.9 1023.4 1017.8 1020.8 1014.2 1008.2 1004.4 1010.7 1020.0 1025.0 1029.2 1032.1 1032.1 DAY 28 6 31 7 12 1 30 31 30 31 30 2 MIN. QFE PRESSURE IN HPA 1009.5 1009.6 1006.2 1008.2 1005.2 1000.5 995.8 997.8 1008.8 1013.0 1019.0 1018.5 995.8 DAY 6 9 4 19 23 8 27 13 10 4 7 27 MEAN QNH PRESSURE IN HPA 1021.3 1018.6 1014.4 1014.9 1009.8 1004.9 1001.3 1004.9 1014.0 1020.7 1025.1 1026.9 1014.7 MAX. QNH PRESSURE IN HPA 1025.5 1024.0 1018.4 1021.4 1014.8 1008.8 1005.0 1011.3 1020.6 1025.6 1029.8 1032.7 1032.7 DAY 28 6 31 7 12 1 30 31 30 31 30 2 MIN. QNH PRESSURE IN HPA 1010.1 1010.2 1006.8 1008.8 1005.8 1001.1 996.4 998.4 1009.4 1013.6 1019.6 1019.1 996.4 DAY 6 9 4 19 23 8 27 13 10 4 7 27 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 1019.2 1016.1 1012.2 1012.8 1008.0 1003.2 999.3 1002.8 1012.0 1018.6 1022.9 1024.6 1012.6 MAX. QFE PRESSURE IN HPA 1022.8 1022.0 1016.2 1019.2 1013.8 1007.0 1002.7 1009.6 1017.5 1023.9 1027.4 1029.8 1029.8 DAY 28 6 31 7 13 1 9 31 30 31 30 1 MIN. QFE PRESSURE IN HPA 1008.8 1008.8 1004.3 1007.6 1004.0 1000.0 993.8 996.3 1007.8 1011.1 1017.6 1016.5 993.8 DAY 6 9 13 4 29 8 27 13 10 4 7 27 MEAN QNH PRESSURE IN HPA 1019.8 1016.7 1012.9 1013.4 1008.6 1003.8 999.9 1003.4 1012.6 1019.2 1023.5 1025.2 1013.3 MAX. QNH PRESSURE IN HPA 1023.4 1022.6 1016.8 1019.8 1014.4 1007.6 1003.3 1010.2 1018.1 1024.5 1028.0 1030.4 1030.4 DAY 28 6 31 7 13 1 9 31 30 31 30 1 MIN. QNH PRESSURE IN HPA 1009.4 1009.4 1004.9 1008.2 1004.6 1000.6 994.4 996.9 1008.4 1011.7 1018.2 1017.1 994.4 DAY 6 9 13 4 29 8 27 13 10 4 7 27 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1019.5 1016.0 1012.0 1012.4 1007.1 1002.3 998.9 1002.1 1011.6 1018.4 1023.3 1024.5 1012.3 MAX. QFE PRESSURE IN HPA 1023.0 1022.0 1016.2 1019.0 1012.5 1005.6 1003.9 1008.8 1017.5 1023.8 1027.8 1030.2 1030.2 DAY 12 6 31 7 12 1 29 31 30 27 30 1 MIN. QFE PRESSURE IN HPA 1010.4 1008.5 1002.7 1007.2 1003.0 998.9 993.0 995.8 1007.0 1012.0 1018.6 1016.5 993.0 DAY 6 28 13 25 21 8 27 13 11 4 25 27 MEAN QNH PRESSURE IN HPA 1020.1 1016.6 1012.6 1013.0 1007.7 1002.9 999.5 1002.8 1012.3 1019.0 1023.9 1025.1 1013.0 MAX. QNH PRESSURE IN HPA 1023.6 1022.6 1016.8 1019.6 1013.1 1006.2 1004.5 1009.4 1018.1 1024.4 1028.4 1030.8 1030.8 DAY 12 6 31 7 12 1 29 31 30 27 30 1 MIN. QNH PRESSURE IN HPA 1011.0 1009.1 1003.3 1007.8 1003.6 999.5 993.6 996.4 1007.6 1012.6 1019.2 1017.1 993.6 DAY 6 28 13 25 21 8 27 13 11 4 25 27 MEAN QFF PRESSURE IN HPA 1020.4 1016.8 1012.9 1013.3 1008.0 1003.2 999.7 1003.0 1012.5 1019.3 1024.2 1025.4 1013.2 MAX. QFF PRESSURE IN HPA 1024.0 1022.9 1017.1 1019.9 1013.4 1006.5 1004.8 1009.7 1018.4 1024.7 1028.7 1031.1 1031.1 DAY 12 6 31 7 12 1 29 31 30 27 30 1 MIN. QFF PRESSURE IN HPA 1011.3 1009.4 1003.6 1008.1 1003.9 999.8 993.8 996.6 1007.9 1012.9 1019.5 1017.4 993.8 DAY 6 28 13 25 21 8 27 13 11 4 25 27 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** 1012.5 1008.2 ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** 1019.8 1013.0 ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** 21 12 ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** 1008.0 1005.0 ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** 18 29 ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** 1013.1 1008.9 ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** 1020.4 1013.6 ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** 21 12 ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** 1008.6 1005.6 ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** 18 29 ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** 1013.4 1009.1 ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** 1020.7 1013.9 ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** 21 12 ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** 1008.9 1005.9 ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** 18 29 ** ** ** ** ** ** ** 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 BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 M MEANS AND EXTREMES FOR THE YEAR 1988 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 11.3 15.4 18.5 25.2 31.4 35.2 37.6 36.7 33.4 28.5 18.9 13.7 25.5 MINIMUN AIR TEMPERATURE (C) 5.5 8.0 11.8 16.7 17.8 18.4 22.9 23.0 18.8 16.4 8.9 6.8 14.6 DAYS WITH MINIMUM TEMP. >=21 0 0 0 5 4 2 29 26 5 3 0 0 74 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 4 0 0 0 0 0 0 0 0 0 2 2 8 TEMPERATURE RECORDS LOWEST(C) -0.4 3.2 4.0 8.1 14.0 16.0 20.0 16.6 15.4 11.8 -3.0 -1.5 -3.0 DAY 2 12 6 2 24 4 1 31 12 7 15 29 MAXIMUM AIR TEMPERATURE (C) 15.8 20.3 22.9 30.7 37.6 43.0 44.6 43.5 41.6 36.3 26.8 19.0 31.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 1 16 31 30 31 30 30 30 9 0 208 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 19.8 25.0 31.0 38.8 43.0 47.6 50.0 47.8 46.0 39.0 35.4 25.0 50.0 DAY 26 29 30 22 31 15 13 1 9 4 8 7 DIF. BETWEEN (MAX.-MIN.) (C) 10.3 12.3 11.1 14.0 19.8 24.6 21.7 20.5 22.8 19.9 17.9 12.2 17.2 MEAN DAILY TEMP. (MDT) (C) 10.7 14.1 17.3 23.7 27.7 30.7 33.7 33.3 30.2 26.3 17.8 12.9 23.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 2.2 100.5 207.4 291.7 394.5 355.2 275.7 165.2 33.6 0.0 1826.1 HEATING DEG. DAYS(BASE 18 0C) 227.5 112.3 43.5 1.3 0.0 0.0 0.0 0.0 0.0 0.0 78.7 158.9 622.0 DEWPOINT (MEAN C) 6.5 6.7 8.7 12.9 11.5 16.9 17.9 17.3 13.7 12.4 5.1 7.2 11.4 MIXING RATIO (G/KG) 6.12 6.26 7.13 9.64 9.02 12.62 13.96 13.03 10.22 9.39 5.82 6.55 9.15 VAPOUR PRESSURE (HPA) 9.91 10.10 11.47 15.38 14.34 19.87 21.76 20.41 16.19 14.99 9.41 10.59 14.54 SATURATION DEF. (HPA) 3.91 7.99 10.72 18.32 34.19 40.64 47.23 44.88 39.72 26.72 15.08 5.99 24.62 RELATIVE HUMIDITY (MEAN %) 76 60 57 50 35 37 36 36 34 41 44 68 48 RELATIVE HUMIDITY (MAX. %) 95 85 83 75 65 62 58 63 62 67 66 86 72 RELATIVE HUMIDITY (MIN. %) 56 40 39 33 17 25 24 22 20 23 26 50 31 RELATIVE HUMIDITY (MEAN% 03UTC) 93 83 82 75 65 62 58 64 62 67 66 85 72 RELATIVE HUMIDITY (MEAN% 09UTC) 70 50 46 40 22 28 29 25 23 29 33 60 38 RELATIVE HUMIDITY (MEAN% 15UTC) 69 52 51 45 32 31 28 30 32 40 43 66 43 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 43.6 46.8 30.2 32.8 0.8 0.0 0.0 0.0 0.0 0.0 3.0 22.1 179.3 DAYS WITH PRECIPITATION >=10 1 1 2 2 0 0 0 0 0 0 0 1 7 DAYS WITH PRECIPITATION >= 5 4 2 3 2 0 0 0 0 0 0 0 1 12 DAYS WITH PRECIPITATION >= 1 8 5 4 3 0 0 0 0 0 0 1 5 26 DAYS WITH PRECIPITATION 11 9 6 7 1 0 0 0 0 0 1 6 41 GREATEST DAILY PRECIPITATION 13.0 32.0 10.0 15.0 0.8 0.0 0.0 0.0 0.0 0.0 3.0 15.0 32.0 DAY 13 23 8 26 2 ** ** ** ** ** 28 17 DAY WITH THUNDER STORM 1 2 2 5 2 0 0 0 0 0 1 0 13 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH DUST 0 3 9 3 8 1 3 3 8 0 0 0 38 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 270 225 225 *** 270 270 *** PREVAILING WIND SPEED(KNOTS) 7.5 7.1 11.8 11.8 13.5 13.1 11.9 9.2 10.8 **** 10.2 7.5 **** PREVAILING WIND PERCENT 13.5 23.4 29.0 19.3 40.6 37.3 32.7 28.3 25.3 ***** 26.7 20.6 ***** CALMS PERCENT OF WIND 54.8 38.6 23.9 28.0 12.9 13.3 46.0 25.0 38.0 ***** 28.7 40.6 ***** NO. OF WIND OBSERVATION 155 145 155 150 155 150 150 152 150 101 150 155 1768 VECTOR WIND DIRECTION (MEAN) 331 196 289 230 271 265 260 255 263 *** 284 270 *** VECTOR WIND MAGNITUDE(KNOTS) 1.0 0.6 2.8 1.2 7.6 7.9 5.1 5.6 6.2 **** 3.3 1.1 **** WIND STEADINESES (MEAN %) 27.8 10.7 32.6 15.8 72.4 79.8 86.4 73.7 83.8 ***** 47.8 22.4 ***** WIND SPEED (MEAN KNOTS) 3.6 5.6 8.6 7.6 10.5 9.9 5.9 7.6 7.4 **** 6.9 4.9 **** FASTEST WIND DIRECTION 360 120 300 120 60 280 290 290 290 *** 300 120 *** FASTEST WIND SPEED (KNOTS) 23 27 29 27 29 23 29 27 31 *** 23 23 *** DAY 15 1 14 25 2 6 4 1 10 ** 14 25 DAYS WITH SKY CLEAR (0-2)/8 12 13 16 10 25 29 28 31 29 24 20 11 248 DAYS WITH P.CLOUDY (3-6)/8 12 14 9 12 5 1 2 0 1 6 8 10 80 DAYS WITH CLOUDY (7-8)/8 7 2 6 8 1 0 0 0 0 1 2 9 36 DAYS WITH VISIBILITY =< 2 KM 13 2 4 1 0 0 3 1 1 0 0 10 35 DURATION OF SUNSHINE HOURS 173.4 191.0 224.4 188.0 310.9 340.4 320.1 ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1018.4 1014.7 1012.1 1009.4 1006.2 1000.9 994.8 996.8 1002.7 1009.9 1016.9 1017.3 1008.3 MAX. QFE PRESSURE IN HPA 1025.8 1023.2 1019.0 1016.1 1011.7 1005.4 1000.4 1004.2 1008.5 1016.6 1025.2 1029.0 1029.0 DAY-HOUR 3- 9 20- 6 15- 9 8- 9 8- 6 3- 6 30- 6 31- 6 14- 9 28- 6 15- 6 29- 6 MIN. QFE PRESSURE IN HPA 1010.8 1004.2 1001.0 999.4 1001.0 994.8 988.9 992.0 996.8 1002.8 1009.3 1004.8 988.9 DAY-HOUR 26- 3 23-15 8-15 25-15 17-15 30-15 15-15 11-15 2-15 1-12 10-15 26- 3 MEAN QNH PRESSURE IN HPA 1019.1 1015.3 1012.7 1010.0 1006.8 1001.5 995.4 997.4 1003.3 1010.5 1017.5 1018.0 1009.0 MAX. QNH PRESSURE IN HPA 1026.4 1023.8 1019.6 1016.7 1012.3 1006.0 1001.0 1004.8 1009.1 1017.2 1025.8 1029.6 1029.6 DAY-HOUR 3- 9 20- 6 15- 9 8- 9 8- 6 3- 6 30- 6 31- 6 14- 9 28- 6 15- 6 29- 6 MIN. QNH PRESSURE IN HPA 1011.4 1004.8 1001.6 1000.0 1001.6 995.4 989.5 992.6 997.4 1003.4 1009.9 1005.4 989.5 DAY-HOUR 26- 3 23-15 8-15 25-15 17-15 30-15 15-15 11-15 2-15 1-12 10-15 26- 3 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 1018.2 1014.7 1011.9 1009.3 1006.2 1000.9 994.7 996.7 1002.5 1009.8 1016.9 1017.2 1008.2 MAX. QFE PRESSURE IN HPA 1024.2 1022.0 1017.4 1014.5 1011.0 1004.2 999.2 1002.6 1006.8 1015.0 1024.4 1027.5 1027.5 DAY 4 20 15 8 4 18 30 31 15 28 15 29 MIN. QFE PRESSURE IN HPA 1010.8 1004.5 1006.2 1002.4 1001.2 996.0 990.2 993.2 997.2 1003.2 1011.8 1004.8 990.2 DAY 26 2 21 25 18 28 15 11 17 1 28 26 MEAN QNH PRESSURE IN HPA 1018.8 1015.3 1012.5 1009.9 1006.8 1001.6 995.3 997.4 1003.2 1010.4 1017.6 1017.8 1008.9 MAX. QNH PRESSURE IN HPA 1024.8 1022.6 1018.0 1015.1 1011.6 1004.8 999.8 1003.2 1007.4 1015.6 1025.0 1028.1 1028.1 DAY 4 20 15 8 4 18 30 31 15 28 15 29 MIN. QNH PRESSURE IN HPA 1011.4 1005.1 1006.8 1003.0 1001.8 996.6 990.8 993.8 997.8 1003.8 1012.4 1005.4 990.8 DAY 26 2 21 25 18 28 15 11 17 1 28 26 MEAN QFF PRESSURE IN HPA 1019.1 1015.6 1012.8 1010.2 1007.0 1001.8 995.5 997.6 1003.4 1010.7 1017.9 1018.1 1009.2 MAX. QFF PRESSURE IN HPA 1025.2 1022.9 1018.3 1015.4 1011.9 1005.1 1000.1 1003.5 1007.7 1015.9 1025.4 1028.5 1028.5 DAY 4 20 15 8 4 18 30 31 15 28 15 29 MIN. QFF PRESSURE IN HPA 1011.7 1005.4 1007.1 1003.3 1002.1 996.9 991.0 994.1 998.1 1004.1 1012.7 1005.7 991.0 DAY 26 2 21 25 18 28 15 11 17 1 28 26 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1019.4 1016.0 1013.3 1010.6 1007.2 1001.7 995.5 997.8 1003.9 1011.3 1018.5 1018.5 1009.5 MAX. QFE PRESSURE IN HPA 1025.0 1023.2 1018.9 1016.0 1011.7 1005.4 1000.4 1004.2 1008.2 1016.6 1025.2 1029.0 1029.0 DAY 3 20 6 8 8 3 30 31 14 28 15 29 MIN. QFE PRESSURE IN HPA 1012.4 1006.8 1008.2 1002.4 1002.8 996.9 991.0 994.8 999.7 1004.5 1014.2 1005.8 991.0 DAY 26 2 20 25 27 28 15 3 3 1 10 26 MEAN QNH PRESSURE IN HPA 1020.0 1016.6 1013.9 1011.2 1007.8 1002.4 996.2 998.5 1004.5 1011.9 1019.1 1019.2 1010.1 MAX. QNH PRESSURE IN HPA 1025.6 1023.8 1019.5 1016.6 1012.3 1006.0 1001.0 1004.8 1008.8 1017.2 1025.8 1029.6 1029.6 DAY 3 20 6 8 8 3 30 31 14 28 15 29 MIN. QNH PRESSURE IN HPA 1013.0 1007.4 1008.8 1003.0 1003.4 997.5 991.6 995.4 1000.3 1005.1 1014.8 1006.4 991.6 DAY 26 2 20 25 27 28 15 3 3 1 10 26 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 1019.3 1015.6 1013.0 1010.3 1006.9 1001.7 995.7 997.6 1003.5 1010.3 1017.4 1017.9 1009.1 MAX. QFE PRESSURE IN HPA 1025.8 1022.0 1019.0 1016.1 1011.0 1005.0 1000.1 1003.8 1008.5 1016.0 1024.0 1028.2 1028.2 DAY 3 4 15 8 3 3 12 31 14 28 15 29 MIN. QFE PRESSURE IN HPA 1012.6 1007.4 1007.3 1002.1 1002.8 996.9 991.0 994.5 999.5 1003.5 1012.1 1007.0 991.0 DAY 26 2 20 25 18 28 15 11 17 1 10 26 MEAN QNH PRESSURE IN HPA 1019.9 1016.2 1013.6 1010.9 1007.5 1002.3 996.3 998.2 1004.2 1011.0 1018.1 1018.5 1009.7 MAX. QNH PRESSURE IN HPA 1026.4 1022.6 1019.6 1016.7 1011.6 1005.6 1000.7 1004.4 1009.1 1016.6 1024.6 1028.8 1028.8 DAY 3 4 15 8 3 3 12 31 14 28 15 29 MIN. QNH PRESSURE IN HPA 1013.2 1008.0 1007.9 1002.7 1003.4 997.5 991.6 995.1 1000.1 1004.1 1012.7 1007.6 991.6 DAY 26 2 20 25 18 28 15 11 17 1 10 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 1017.6 1013.5 1011.2 1008.6 1005.7 1000.5 994.4 996.3 1001.9 1008.9 1015.7 1016.4 1007.5 MAX. QFE PRESSURE IN HPA 1024.0 1020.5 1017.0 1014.7 1010.9 1004.0 999.3 1002.0 1007.0 1014.6 1022.6 1027.0 1027.0 DAY 3 4 15 12 3 3 2 31 14 28 14 29 MIN. QFE PRESSURE IN HPA 1011.5 1005.2 1004.8 1000.7 1001.8 995.7 990.0 993.0 998.0 1002.8 1009.8 1005.4 990.0 DAY 26 23 20 25 27 28 15 10 2 1 10 25 MEAN QNH PRESSURE IN HPA 1018.2 1014.1 1011.8 1009.2 1006.3 1001.1 995.1 996.9 1002.5 1009.5 1016.4 1017.1 1008.2 MAX. QNH PRESSURE IN HPA 1024.6 1021.1 1017.6 1015.3 1011.5 1004.6 999.9 1002.6 1007.6 1015.2 1023.2 1027.6 1027.6 DAY 3 4 15 12 3 3 2 31 14 28 14 29 MIN. QNH PRESSURE IN HPA 1012.1 1005.8 1005.4 1001.3 1002.4 996.3 990.6 993.6 998.6 1003.4 1010.4 1006.0 990.6 DAY 26 23 20 25 27 28 15 10 2 1 10 25 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1017.8 1013.7 1011.0 1008.0 1005.2 999.7 993.6 995.6 1001.5 1009.1 1015.8 1016.7 1007.3 MAX. QFE PRESSURE IN HPA 1024.0 1021.0 1017.0 1014.9 1010.8 1003.0 998.1 1002.0 1005.2 1014.0 1023.0 1026.8 1026.8 DAY 3 4 15 12 3 3 2 31 14 23 14 29 MIN. QFE PRESSURE IN HPA 1011.8 1004.2 1001.0 999.4 1001.0 994.8 988.9 992.0 996.8 1002.8 1009.3 1005.4 988.9 DAY 25 23 8 25 17 30 15 11 2 1 10 25 MEAN QNH PRESSURE IN HPA 1018.4 1014.3 1011.7 1008.7 1005.8 1000.3 994.2 996.2 1002.1 1009.7 1016.5 1017.3 1007.9 MAX. QNH PRESSURE IN HPA 1024.6 1021.6 1017.6 1015.5 1011.4 1003.6 998.7 1002.6 1005.8 1014.6 1023.6 1027.4 1027.4 DAY 3 4 15 12 3 3 2 31 14 23 14 29 MIN. QNH PRESSURE IN HPA 1012.4 1004.8 1001.6 1000.0 1001.6 995.4 989.5 992.6 997.4 1003.4 1009.9 1006.0 989.5 DAY 25 23 8 25 17 30 15 11 2 1 10 25 MEAN QFF PRESSURE IN HPA 1018.7 1014.6 1012.0 1008.9 1006.0 1000.5 994.4 996.5 1002.4 1010.0 1016.8 1017.6 1008.2 MAX. QFF PRESSURE IN HPA 1025.0 1021.9 1017.9 1015.8 1011.7 1003.9 999.0 1002.9 1006.1 1014.9 1024.0 1027.8 1027.8 DAY 3 4 15 12 3 3 2 31 14 31 14 29 MIN. QFF PRESSURE IN HPA 1012.7 1005.1 1001.9 1000.3 1001.9 995.7 989.7 992.8 997.7 1003.7 1010.2 1006.3 989.7 DAY 25 23 8 25 31 30 15 11 2 1 10 25 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 M MEANS AND EXTREMES FOR THE YEAR 1989 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 9.4 12.8 19.4 27.6 32.8 36.4 39.9 37.9 33.6 28.7 19.8 12.8 25.9 MINIMUN AIR TEMPERATURE (C) 1.4 3.2 ***** ***** ***** 20.1 23.8 23.0 19.0 16.0 10.8 5.6 ***** DAYS WITH MINIMUM TEMP. >=21 0 0 **** **** **** 11 28 28 9 0 0 0 **** DAYS WITH MINIMUM TEMP. <=-4 1 0 **** **** **** 0 0 0 0 0 0 0 **** DAYS WITH FREEZING MIN.<= 0 13 11 **** **** **** 0 0 0 0 0 0 0 **** TEMPERATURE RECORDS LOWEST(C) -4.0 -2.5 ***** ***** ***** 16.0 20.0 20.0 14.0 7.5 4.0 0.5 ***** DAY 6 3 ** ** ** 17 6 28 30 24 22 8 MAXIMUM AIR TEMPERATURE (C) 15.2 18.8 24.6 33.2 39.3 44.3 47.6 46.0 42.0 36.2 26.0 18.0 32.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 2 23 30 30 30 31 30 31 3 0 210 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 20.5 26.6 30.0 37.5 46.0 50.0 50.0 48.4 46.0 42.0 31.0 25.0 50.0 DAY 10 28 7 27 30 27 19 27 5 4 2 1 DIF. BETWEEN (MAX.-MIN.) (C) 13.8 15.6 ***** ***** ***** 24.2 23.8 23.0 23.0 20.2 15.2 12.4 ***** MEAN DAILY TEMP. (MDT) (C) 8.3 11.0 ***** ***** ***** 32.2 35.7 34.5 30.5 26.1 18.4 11.8 ***** COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.6 115.7 311.7 440.1 404.0 285.7 163.1 6.6 1.5 ****** HEATING DEG. DAYS(BASE 18 0C) 300.7 196.2 13.9 3.0 0.0 0.0 0.0 0.0 0.0 0.0 28.8 197.9 ****** DEWPOINT (MEAN C) 1.9 1.8 8.6 8.1 7.8 10.6 14.1 15.5 15.5 10.1 9.0 6.9 9.2 MIXING RATIO (G/KG) 4.45 4.59 7.16 7.09 7.01 8.45 10.58 12.27 12.37 8.10 7.57 6.41 8.00 VAPOUR PRESSURE (HPA) 7.23 7.45 11.49 11.36 11.20 13.39 16.64 19.16 19.46 12.98 12.21 10.37 12.74 SATURATION DEF. (HPA) 5.30 8.32 11.99 27.51 42.13 52.05 61.75 51.83 36.57 29.29 12.23 5.17 28.68 RELATIVE HUMIDITY (MEAN %) 63 55 54 34 27 25 25 31 38 35 55 71 43 RELATIVE HUMIDITY (MAX. %) 88 85 83 63 54 49 44 51 58 56 79 92 67 RELATIVE HUMIDITY (MIN. %) 41 33 35 19 14 13 15 18 24 20 37 51 27 RELATIVE HUMIDITY (MEAN% 03UTC) 86 83 80 63 51 47 43 47 54 53 78 90 65 RELATIVE HUMIDITY (MEAN% 09UTC) 52 42 48 26 18 16 16 24 31 28 47 63 34 RELATIVE HUMIDITY (MEAN% 15UTC) 54 42 43 23 19 19 19 24 32 29 48 61 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 9.7 45.2 27.0 0.0 0.3 0.0 0.0 0.0 0.0 0.0 15.0 61.0 158.2 DAYS WITH PRECIPITATION >=10 0 2 1 0 0 0 0 0 0 0 1 2 6 DAYS WITH PRECIPITATION >= 5 0 4 2 0 0 0 0 0 0 0 1 3 10 DAYS WITH PRECIPITATION >= 1 5 4 4 0 0 0 0 0 0 0 4 7 24 DAYS WITH PRECIPITATION 5 8 4 0 2 0 0 0 0 0 4 7 30 GREATEST DAILY PRECIPITATION 4.0 15.0 20.0 0.0 0.2 0.0 0.0 0.0 0.0 0.0 10.0 35.0 35.0 DAY 3 19 15 ** 13 ** ** ** ** ** 12 4 DAY WITH THUNDER STORM 0 0 2 0 1 0 0 0 0 0 0 0 3 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH DUST 0 0 2 0 7 13 15 20 9 6 1 0 73 WIND DIRECTION (PREVAILING) 270 315 135 270 270 270 270 270 270 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 13.1 6.1 11.8 14.5 15.2 16.5 13.8 14.1 14.6 13.6 10.7 11.7 13.8 PREVAILING WIND PERCENT 16.8 17.1 12.3 11.3 33.5 41.3 33.3 31.6 35.3 21.9 16.0 28.4 24.5 CALMS PERCENT OF WIND 40.6 47.9 47.7 38.7 29.0 25.3 33.3 35.5 46.0 60.0 33.3 37.4 39.6 NO. OF WIND OBSERVATION 155 140 155 150 155 150 150 155 150 155 150 155 1820 VECTOR WIND DIRECTION (MEAN) 291 277 190 263 273 269 253 263 268 225 27 286 266 VECTOR WIND MAGNITUDE(KNOTS) 2.4 1.2 1.2 2.0 5.8 10.5 5.8 6.9 6.9 1.9 0.6 3.7 3.8 WIND STEADINESES (MEAN %) 39.3 36.4 17.6 25.3 53.2 89.7 63.0 82.1 92.0 37.3 7.9 49.3 49.4 WIND SPEED (MEAN KNOTS) 6.1 3.3 6.8 7.9 10.9 11.7 9.2 8.4 7.5 5.1 7.6 7.5 7.7 FASTEST WIND DIRECTION 250 250 240 190 300 270 230 240 280 120 100 120 300 FASTEST WIND SPEED (KNOTS) 39 21 39 23 43 29 29 29 31 29 29 29 43 DAY 4 11 10 24 14 1 4 3 10 30 14 12 DAYS WITH SKY CLEAR (0-2)/8 18 15 15 18 22 30 30 29 30 21 10 16 254 DAYS WITH P.CLOUDY (3-6)/8 8 8 8 7 4 0 0 2 0 8 11 9 65 DAYS WITH CLOUDY (7-8)/8 5 5 8 5 5 0 0 0 0 2 9 6 45 DAYS WITH VISIBILITY =< 2 KM 9 1 4 0 1 3 0 0 0 3 3 16 40 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1018.3 1018.8 1010.6 1010.0 1006.0 1000.2 997.1 997.5 1003.8 1011.3 1017.4 1018.2 1009.1 MAX. QFE PRESSURE IN HPA 1028.5 1024.9 1023.0 1022.0 1015.8 1006.2 1002.2 1002.0 1010.2 1018.9 1023.0 1024.0 1028.5 DAY-HOUR 15- 6 4- 6 31- 9 1- 6 8- 9 12- 6 8- 6 31- 6 24- 6 27- 6 22- 6 18- 6 MIN. QFE PRESSURE IN HPA 1005.4 1007.2 997.0 1001.6 1000.0 994.2 993.0 992.2 998.4 1004.2 1013.2 1012.0 992.2 DAY-HOUR 11-12 22-15 10- 6 12-15 30-12 30-15 30-12 27-15 1-15 11-12 14-12 12-15 MEAN QNH PRESSURE IN HPA 1018.9 1019.5 1011.2 1010.6 1006.6 1000.9 997.7 998.2 1004.4 1011.9 1018.0 1018.8 1009.7 MAX. QNH PRESSURE IN HPA 1029.1 1025.5 1023.6 1022.6 1016.4 1006.8 1002.8 1002.6 1010.8 1019.5 1023.6 1024.6 1029.1 DAY-HOUR 15- 6 4- 6 31- 9 1- 6 8- 9 12- 6 8- 6 31- 6 24- 6 27- 6 22- 6 18- 6 MIN. QNH PRESSURE IN HPA 1006.0 1007.8 997.6 1002.2 1000.6 994.8 993.6 992.8 999.0 1004.8 1013.8 1012.6 992.8 DAY-HOUR 11-12 22-15 10- 6 12-15 30-12 30-15 30-12 27-15 1-15 11-12 14-12 12-15 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 1018.1 1019.1 1010.7 1010.1 1005.8 1000.4 997.0 997.2 1003.6 1011.4 1017.3 1018.4 1009.1 MAX. QFE PRESSURE IN HPA 1023.2 1024.0 1020.8 1021.0 1013.8 1005.0 1002.0 1000.0 1009.0 1018.0 1021.4 1023.0 1024.0 DAY 30 8 31 1 8 12 9 31 30 27 22 18 MIN. QFE PRESSURE IN HPA 1013.8 1012.2 1000.0 1004.2 1001.2 996.0 994.0 992.2 1000.0 1006.2 1013.2 1013.6 992.2 DAY 11 22 10 23 30 16 20 28 6 6 15 4 MEAN QNH PRESSURE IN HPA 1018.8 1019.7 1011.3 1010.8 1006.4 1001.0 997.6 997.9 1004.2 1012.1 1017.9 1019.1 1009.7 MAX. QNH PRESSURE IN HPA 1023.8 1024.6 1021.4 1021.6 1014.4 1005.6 1002.6 1000.6 1009.6 1018.6 1022.0 1023.6 1024.6 DAY 30 8 31 1 8 12 9 31 30 27 22 18 MIN. QNH PRESSURE IN HPA 1014.4 1012.8 1000.6 1004.8 1001.8 996.6 994.6 992.8 1000.6 1006.8 1013.8 1014.2 992.8 DAY 11 22 10 23 30 16 20 28 6 6 15 4 MEAN QFF PRESSURE IN HPA 1019.1 1020.0 1011.6 1011.0 1006.7 1001.2 997.9 998.1 1004.6 1012.3 1018.2 1019.4 1010.0 MAX. QFF PRESSURE IN HPA 1024.2 1025.0 1021.8 1021.9 1014.7 1005.9 1002.9 1000.9 1009.9 1018.9 1022.4 1024.0 1025.0 DAY 30 8 31 1 8 12 9 31 30 27 22 18 MIN. QFF PRESSURE IN HPA 1014.7 1013.1 1000.9 1005.1 1002.1 996.8 994.8 993.1 1000.9 1007.1 1014.1 1014.5 993.1 DAY 11 22 10 23 30 29 20 28 9 6 15 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1019.6 1020.2 1011.4 1011.5 1006.9 1001.1 997.8 998.4 1004.8 1012.4 1018.4 1019.2 1010.1 MAX. QFE PRESSURE IN HPA 1028.5 1024.9 1022.4 1022.0 1014.8 1006.2 1002.2 1002.0 1010.2 1018.9 1023.0 1024.0 1028.5 DAY 15 4 31 1 8 12 8 31 24 27 22 18 MIN. QFE PRESSURE IN HPA 1012.0 1011.8 997.0 1005.2 1002.2 996.0 995.0 993.2 1000.4 1007.2 1014.2 1013.2 993.2 DAY 11 22 10 23 30 30 20 28 6 6 15 4 MEAN QNH PRESSURE IN HPA 1020.3 1020.8 1012.1 1012.1 1007.5 1001.7 998.4 999.1 1005.5 1013.0 1019.0 1019.9 1010.8 MAX. QNH PRESSURE IN HPA 1029.1 1025.5 1023.0 1022.6 1015.4 1006.8 1002.8 1002.6 1010.8 1019.5 1023.6 1024.6 1029.1 DAY 15 4 31 1 8 12 8 31 24 27 22 18 MIN. QNH PRESSURE IN HPA 1012.6 1012.4 997.6 1005.8 1002.8 996.6 995.6 993.8 1001.0 1007.8 1014.8 1013.8 993.8 DAY 11 22 10 23 30 30 20 28 6 6 15 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 1019.2 1019.8 1011.2 1011.1 1006.8 1000.9 997.7 998.6 1004.7 1012.1 1018.1 1018.7 1009.9 MAX. QFE PRESSURE IN HPA 1024.5 1024.6 1023.0 1020.2 1015.8 1006.2 1002.2 1002.0 1010.0 1017.7 1022.8 1024.0 1024.6 DAY 18 8 31 1 8 12 8 31 24 27 22 18 MIN. QFE PRESSURE IN HPA 1009.4 1010.6 998.0 1004.7 1002.0 996.0 995.0 995.0 1000.0 1006.2 1014.0 1012.2 995.0 DAY 11 22 10 23 30 30 20 25 8 11 16 4 MEAN QNH PRESSURE IN HPA 1019.8 1020.4 1011.9 1011.8 1007.4 1001.5 998.3 999.3 1005.3 1012.8 1018.7 1019.3 1010.5 MAX. QNH PRESSURE IN HPA 1025.1 1025.2 1023.6 1020.8 1016.4 1006.8 1002.8 1002.6 1010.6 1018.3 1023.4 1024.6 1025.2 DAY 18 8 31 1 8 12 8 31 24 27 22 18 MIN. QNH PRESSURE IN HPA 1010.0 1011.2 998.6 1005.3 1002.6 996.6 995.6 995.6 1000.6 1006.8 1014.6 1012.8 995.6 DAY 11 22 10 23 30 30 20 25 8 11 16 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 1017.4 1017.6 1009.9 1009.2 1005.6 999.7 996.9 997.0 1003.2 1010.3 1016.7 1017.3 1008.4 MAX. QFE PRESSURE IN HPA 1022.2 1022.5 1021.0 1019.0 1013.8 1004.8 1001.3 999.4 1008.0 1016.6 1021.2 1023.0 1023.0 DAY 18 8 31 1 8 12 8 11 29 26 21 18 MIN. QFE PRESSURE IN HPA 1005.4 1008.2 1001.7 1003.2 1000.0 995.0 993.0 992.8 999.0 1004.2 1013.2 1012.2 992.8 DAY 11 22 10 23 30 30 30 27 8 11 14 4 MEAN QNH PRESSURE IN HPA 1018.0 1018.3 1010.5 1009.8 1006.2 1000.3 997.5 997.7 1003.8 1010.9 1017.3 1018.0 1009.0 MAX. QNH PRESSURE IN HPA 1022.8 1023.1 1021.6 1019.6 1014.4 1005.4 1001.9 1000.0 1008.6 1017.2 1021.8 1023.6 1023.6 DAY 18 8 31 1 8 12 8 11 29 26 21 18 MIN. QNH PRESSURE IN HPA 1006.0 1008.8 1002.3 1003.8 1000.6 995.6 993.6 993.4 999.6 1004.8 1013.8 1012.8 993.4 DAY 11 22 10 23 30 30 30 27 8 11 14 4 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1017.3 1017.6 1009.7 1008.2 1005.0 999.1 996.4 996.4 1002.8 1010.1 1016.6 1017.4 1008.1 MAX. QFE PRESSURE IN HPA 1023.0 1022.0 1020.0 1018.0 1012.8 1004.0 1001.0 999.0 1007.7 1016.2 1021.8 1024.0 1024.0 DAY 18 7 31 1 8 12 8 3 29 27 21 18 MIN. QFE PRESSURE IN HPA 1007.2 1007.2 1003.2 1001.6 1000.0 994.2 993.0 992.2 998.4 1004.2 1013.2 1012.0 992.2 DAY 11 22 9 12 30 30 30 27 1 11 14 12 MEAN QNH PRESSURE IN HPA 1018.0 1018.2 1010.3 1008.8 1005.7 999.8 997.0 997.0 1003.4 1010.7 1017.3 1018.1 1008.7 MAX. QNH PRESSURE IN HPA 1023.6 1022.6 1020.6 1018.6 1013.4 1004.6 1001.6 999.6 1008.3 1016.8 1022.4 1024.6 1024.6 DAY 18 7 31 1 8 12 8 3 29 27 21 18 MIN. QNH PRESSURE IN HPA 1007.8 1007.8 1003.8 1002.2 1000.6 994.8 993.6 992.8 999.0 1004.8 1013.8 1012.6 992.8 DAY 11 22 9 12 30 30 30 27 1 11 14 12 MEAN QFF PRESSURE IN HPA 1018.3 1018.5 1010.6 1009.1 1005.9 1000.0 997.2 997.2 1003.8 1011.0 1017.6 1018.4 1009.0 MAX. QFF PRESSURE IN HPA 1024.0 1023.0 1020.9 1018.9 1013.7 1004.9 1001.9 999.9 1008.6 1017.1 1022.7 1025.0 1025.0 DAY 18 8 31 1 8 12 8 3 29 27 21 18 MIN. QFF PRESSURE IN HPA 1008.1 1008.1 1004.1 1002.5 1000.9 995.1 993.9 993.0 999.2 1005.1 1014.1 1012.9 993.0 DAY 11 22 9 12 30 30 30 27 1 11 16 12 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 M MEANS AND EXTREMES FOR THE YEAR 1990 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 10.6 14.2 19.6 25.5 33.9 36.9 39.5 37.1 34.0 28.1 21.2 14.9 26.3 MINIMUN AIR TEMPERATURE (C) 3.7 6.1 9.2 14.4 20.0 22.3 25.7 22.6 18.0 15.6 10.6 5.8 14.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 12 22 31 19 0 1 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 7 0 0 0 0 0 0 0 0 0 0 4 11 TEMPERATURE RECORDS LOWEST(C) -3.4 1.6 4.2 9.0 14.0 19.0 21.6 19.0 14.0 10.2 4.0 -3.0 -3.4 DAY 11 7 19 6 8 2 3 23 23 18 14 28 MAXIMUM AIR TEMPERATURE (C) 15.3 19.1 25.6 31.4 40.8 44.6 46.6 45.6 43.0 35.7 28.6 21.3 33.1 DAYS WITH MAXIMUM TEMP. >=30 0 0 2 20 31 30 31 31 30 31 13 0 219 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 21.0 23.0 32.0 38.0 47.0 49.4 50.0 50.0 46.0 41.2 33.0 26.8 50.0 DAY 6 18 31 28 22 8 21 15 5 8 3 6 DIF. BETWEEN (MAX.-MIN.) (C) 11.6 13.0 16.4 17.0 20.8 22.3 20.9 23.0 25.0 20.1 18.0 15.5 18.6 MEAN DAILY TEMP. (MDT) (C) 9.5 12.6 17.4 22.9 30.4 33.4 36.1 34.1 30.5 25.7 19.6 13.6 23.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 2.4 73.2 291.4 372.7 469.5 405.9 284.0 145.1 16.0 0.0 2060.2 HEATING DEG. DAYS(BASE 18 0C) 263.6 150.5 39.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 11.9 144.3 609.3 DEWPOINT (MEAN C) 2.9 3.0 2.5 8.3 9.8 11.3 11.2 8.3 4.8 3.9 4.5 4.9 6.3 MIXING RATIO (G/KG) 4.88 4.92 4.84 7.30 8.28 8.80 8.90 7.36 5.60 5.43 5.62 5.62 6.46 VAPOUR PRESSURE (HPA) 7.92 7.94 7.83 11.70 13.15 13.93 14.02 11.66 8.93 8.74 9.07 9.09 10.33 SATURATION DEF. (HPA) 5.46 8.94 16.41 22.93 44.39 52.60 62.40 56.64 49.25 32.04 17.95 9.16 31.51 RELATIVE HUMIDITY (MEAN %) 63 53 38 39 27 25 21 20 19 25 38 55 35 RELATIVE HUMIDITY (MAX. %) 88 82 69 68 46 49 39 33 33 43 59 79 57 RELATIVE HUMIDITY (MIN. %) 43 33 20 23 16 13 12 11 10 13 22 35 21 RELATIVE HUMIDITY (MEAN% 03UTC) 87 81 65 67 45 48 36 32 33 40 58 78 56 RELATIVE HUMIDITY (MEAN% 09UTC) 54 41 27 29 19 16 15 16 14 22 30 44 27 RELATIVE HUMIDITY (MEAN% 15UTC) 55 41 28 32 23 20 16 15 13 19 34 51 29 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 12.4 21.9 8.8 11.0 2.0 0.0 0.0 0.0 0.0 3.0 15.5 0.6 75.2 DAYS WITH PRECIPITATION >=10 0 0 0 0 0 0 0 0 0 0 1 0 1 DAYS WITH PRECIPITATION >= 5 0 1 1 2 0 0 0 0 0 0 1 0 5 DAYS WITH PRECIPITATION >= 1 6 5 3 2 1 0 0 0 0 1 1 0 19 DAYS WITH PRECIPITATION 9 6 4 2 1 0 0 0 0 1 2 1 26 GREATEST DAILY PRECIPITATION 4.0 9.0 6.0 6.0 2.0 0.0 0.0 0.0 0.0 3.0 15.0 0.6 15.0 DAY 16 11 13 2 12 ** ** ** ** 29 28 25 DAY WITH THUNDER STORM 0 1 0 1 1 0 0 0 0 0 0 0 3 DAYS WITH SNOW OR SLEET 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH DUST 2 5 11 5 9 11 13 9 5 1 1 1 73 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 270 270 270 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 11.9 12.7 15.0 14.0 14.7 15.4 13.3 9.9 7.1 9.0 7.5 8.3 11.6 PREVAILING WIND PERCENT 17.4 20.7 23.2 28.7 32.3 49.3 52.3 58.4 25.3 17.4 41.3 31.6 33.2 CALMS PERCENT OF WIND 49.7 37.9 22.6 22.0 36.1 23.3 26.5 11.7 50.7 58.7 42.0 52.9 36.2 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 154 150 155 150 155 1824 VECTOR WIND DIRECTION (MEAN) 288 282 276 246 275 271 260 268 288 281 259 267 270 VECTOR WIND MAGNITUDE(KNOTS) 2.3 2.8 3.0 3.8 6.8 10.0 7.3 7.6 3.3 0.9 3.0 1.9 4.3 WIND STEADINESES (MEAN %) 40.4 36.8 27.8 32.5 72.3 89.3 76.8 84.4 89.2 25.0 69.8 50.0 57.3 WIND SPEED (MEAN KNOTS) 5.7 7.6 10.8 11.7 9.4 11.2 9.5 9.0 3.7 3.6 4.3 3.8 7.5 FASTEST WIND DIRECTION 280 150 120 160 280 280 240 240 280 270 180 270 160 FASTEST WIND SPEED (KNOTS) 23 29 29 35 27 29 31 29 23 19 19 16 35 DAY 8 2 6 1 26 13 30 25 22 9 27 8 DAYS WITH SKY CLEAR (0-2)/8 12 17 19 13 25 30 31 31 30 24 17 14 263 DAYS WITH P.CLOUDY (3-6)/8 10 6 8 13 5 0 0 0 0 5 12 15 74 DAYS WITH CLOUDY (7-8)/8 9 5 4 4 1 0 0 0 0 2 1 2 28 DAYS WITH VISIBILITY =< 2 KM 4 0 4 1 0 2 1 0 0 0 0 1 13 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1019.4 1014.3 1014.8 1009.9 1004.6 999.8 995.9 998.5 1001.9 1010.7 1015.1 1016.7 1008.5 MAX. QFE PRESSURE IN HPA 1028.0 1021.0 1023.0 1016.8 1011.2 1007.2 1002.2 1002.2 1007.2 1019.2 1023.0 1023.2 1028.0 DAY-HOUR 12- 6 12- 6 9- 6 4- 9 7- 6 4- 6 15- 6 16- 6 22- 6 30- 6 14- 6 28- 6 MIN. QFE PRESSURE IN HPA 1008.6 1004.2 1008.2 1002.2 997.9 992.2 991.2 993.0 997.2 1005.0 1007.2 1010.8 991.2 DAY-HOUR 4-15 15-12 31-15 29-15 30-15 30-15 5-15 13-15 5-12 13-15 1-15 10-12 MEAN QNH PRESSURE IN HPA 1020.1 1014.9 1015.4 1010.5 1005.2 1000.4 996.5 999.1 1002.5 1011.3 1015.7 1017.3 1009.1 MAX. QNH PRESSURE IN HPA 1028.6 1021.6 1023.6 1017.4 1011.8 1007.8 1002.8 1002.8 1007.8 1019.8 1023.6 1023.8 1028.6 DAY-HOUR 12- 6 12- 6 9- 6 4- 9 7- 6 4- 6 15- 6 16- 6 22- 6 30- 6 14- 6 28- 6 MIN. QNH PRESSURE IN HPA 1009.2 1004.8 1008.8 1002.8 998.5 992.8 991.8 993.6 997.8 1005.6 1007.8 1011.4 991.8 DAY-HOUR 4-15 15-12 31-15 29-15 30-15 30-15 5-15 13-15 5-12 13-15 1-15 10-12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 1019.4 1014.2 1014.9 1009.9 1004.6 1000.0 996.0 998.6 1002.0 1010.5 1015.1 1016.7 1008.5 MAX. QFE PRESSURE IN HPA 1027.0 1020.0 1021.0 1015.0 1009.8 1005.4 1001.2 1001.0 1006.2 1018.0 1022.0 1022.2 1027.0 DAY 12 13 9 4 8 4 15 4 22 30 14 28 MIN. QFE PRESSURE IN HPA 1013.0 1005.2 1010.2 1004.4 998.2 995.2 993.2 993.2 998.0 1005.0 1009.0 1011.4 993.2 DAY 1 19 31 15 30 27 5 14 5 14 2 10 MEAN QNH PRESSURE IN HPA 1020.0 1014.8 1015.5 1010.6 1005.2 1000.6 996.7 999.2 1002.6 1011.2 1015.7 1017.3 1009.1 MAX. QNH PRESSURE IN HPA 1027.6 1020.6 1021.6 1015.6 1010.4 1006.0 1001.8 1001.6 1006.8 1018.6 1022.6 1022.8 1027.6 DAY 12 13 9 4 8 4 15 4 22 30 14 28 MIN. QNH PRESSURE IN HPA 1013.6 1005.8 1010.8 1005.0 998.8 995.8 993.8 993.8 998.6 1005.6 1009.6 1012.0 993.8 DAY 1 19 31 15 30 27 5 14 5 14 2 10 MEAN QFF PRESSURE IN HPA 1020.3 1015.1 1015.8 1010.8 1005.5 1000.8 996.9 999.5 1002.8 1011.4 1016.0 1017.6 1009.4 MAX. QFF PRESSURE IN HPA 1028.0 1021.0 1021.9 1015.9 1010.7 1006.3 1002.1 1001.9 1007.1 1018.9 1022.9 1023.2 1028.0 DAY 12 13 9 4 8 4 15 4 22 30 14 28 MIN. QFF PRESSURE IN HPA 1013.9 1006.1 1011.1 1005.3 999.1 996.1 994.1 994.1 998.9 1005.9 1009.9 1012.3 994.1 DAY 1 19 31 15 30 27 5 14 5 14 2 10 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1020.5 1015.4 1015.8 1010.8 1005.7 1000.8 996.9 999.4 1002.8 1011.7 1016.3 1017.8 1009.5 MAX. QFE PRESSURE IN HPA 1028.0 1021.0 1023.0 1016.6 1011.2 1007.2 1002.2 1002.2 1007.2 1019.2 1023.0 1023.2 1028.0 DAY 12 12 9 4 7 4 15 16 22 30 14 28 MIN. QFE PRESSURE IN HPA 1012.2 1005.2 1011.2 1005.4 999.2 996.0 994.0 995.2 998.4 1006.2 1009.8 1012.8 994.0 DAY 4 15 31 15 30 30 5 14 5 1 2 10 MEAN QNH PRESSURE IN HPA 1021.1 1016.0 1016.5 1011.4 1006.3 1001.5 997.5 1000.0 1003.4 1012.3 1016.9 1018.4 1010.1 MAX. QNH PRESSURE IN HPA 1028.6 1021.6 1023.6 1017.2 1011.8 1007.8 1002.8 1002.8 1007.8 1019.8 1023.6 1023.8 1028.6 DAY 12 12 9 4 7 4 15 16 22 30 14 28 MIN. QNH PRESSURE IN HPA 1012.8 1005.8 1011.8 1006.0 999.8 996.6 994.6 995.8 999.0 1006.8 1010.4 1013.4 994.6 DAY 4 15 31 15 30 30 5 14 5 1 2 10 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 1020.1 1015.1 1015.7 1010.7 1005.5 1000.5 996.5 999.1 1002.5 1011.3 1015.6 1017.2 1009.1 MAX. QFE PRESSURE IN HPA 1028.0 1021.0 1023.0 1016.8 1011.0 1006.8 1002.2 1001.8 1007.2 1018.2 1022.0 1022.8 1028.0 DAY 12 12 9 4 7 4 15 20 22 30 14 28 MIN. QFE PRESSURE IN HPA 1010.2 1005.2 1012.2 1005.4 999.2 995.1 993.5 995.1 998.2 1006.4 1009.0 1012.2 993.5 DAY 4 15 24 15 30 30 5 14 5 1 1 10 MEAN QNH PRESSURE IN HPA 1020.7 1015.7 1016.3 1011.3 1006.1 1001.1 997.1 999.7 1003.1 1012.0 1016.2 1017.9 1009.8 MAX. QNH PRESSURE IN HPA 1028.6 1021.6 1023.6 1017.4 1011.6 1007.4 1002.8 1002.4 1007.8 1018.8 1022.6 1023.4 1028.6 DAY 12 12 9 4 7 4 15 20 22 30 14 28 MIN. QNH PRESSURE IN HPA 1010.8 1005.8 1012.8 1006.0 999.8 995.7 994.1 995.7 998.8 1007.0 1009.6 1012.8 994.1 DAY 4 15 24 15 30 30 5 14 5 1 1 10 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 1018.6 1013.4 1014.0 1009.1 1004.0 999.2 995.3 997.8 1001.2 1010.0 1014.2 1015.9 1007.7 MAX. QFE PRESSURE IN HPA 1026.2 1019.2 1021.0 1014.8 1009.0 1005.8 1001.2 1001.8 1005.2 1016.0 1020.4 1021.0 1026.2 DAY 11 12 9 4 7 4 15 20 22 30 14 28 MIN. QFE PRESSURE IN HPA 1009.0 1004.2 1009.2 1003.2 998.0 993.2 992.1 993.1 997.2 1005.2 1007.6 1010.8 992.1 DAY 4 15 31 29 30 30 5 14 5 1 1 10 MEAN QNH PRESSURE IN HPA 1019.3 1014.1 1014.6 1009.8 1004.6 999.9 995.9 998.4 1001.8 1010.7 1014.9 1016.5 1008.4 MAX. QNH PRESSURE IN HPA 1026.8 1019.8 1021.6 1015.4 1009.6 1006.4 1001.8 1002.4 1005.8 1016.6 1021.0 1021.6 1026.8 DAY 11 12 9 4 7 4 15 20 22 30 14 28 MIN. QNH PRESSURE IN HPA 1009.6 1004.8 1009.8 1003.8 998.6 993.8 992.7 993.7 997.8 1005.8 1008.2 1011.4 992.7 DAY 4 15 31 29 30 30 5 14 5 1 1 10 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 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 1018.7 1013.5 1013.7 1008.9 1003.2 998.5 994.8 997.5 1001.1 1009.8 1014.2 1016.0 1007.5 MAX. QFE PRESSURE IN HPA 1026.2 1019.2 1020.2 1014.2 1008.2 1005.0 1001.2 1001.6 1005.2 1015.4 1021.0 1022.0 1026.2 DAY 11 12 9 4 7 4 15 5 22 30 14 28 MIN. QFE PRESSURE IN HPA 1008.6 1007.0 1008.2 1002.2 997.9 992.2 991.2 993.0 997.2 1005.0 1007.2 1011.2 991.2 DAY 4 15 31 29 30 30 5 13 5 13 1 10 MEAN QNH PRESSURE IN HPA 1019.4 1014.1 1014.3 1009.5 1003.8 999.1 995.4 998.1 1001.7 1010.4 1014.8 1016.7 1008.1 MAX. QNH PRESSURE IN HPA 1026.8 1019.8 1020.8 1014.8 1008.8 1005.6 1001.8 1002.2 1005.8 1016.0 1021.6 1022.6 1026.8 DAY 11 12 9 4 7 4 15 5 22 30 14 28 MIN. QNH PRESSURE IN HPA 1009.2 1007.6 1008.8 1002.8 998.5 992.8 991.8 993.6 997.8 1005.6 1007.8 1011.8 991.8 DAY 4 15 31 29 30 30 5 13 5 13 1 10 MEAN QFF PRESSURE IN HPA 1019.7 1014.4 1014.6 1009.8 1004.0 999.4 995.6 998.3 1002.0 1010.7 1015.1 1017.0 1008.4 MAX. QFF PRESSURE IN HPA 1027.2 1020.1 1021.1 1015.1 1009.1 1005.9 1002.1 1002.4 1006.1 1016.3 1022.0 1023.0 1027.2 DAY 11 12 9 4 7 4 15 5 22 30 14 28 MIN. QFF PRESSURE IN HPA 1009.5 1007.9 1009.1 1003.1 998.8 993.1 992.1 993.9 998.1 1005.9 1008.1 1012.1 992.1 DAY 4 15 31 29 30 30 5 13 5 13 1 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION BOSTAN (40810) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 31 43 N LONGITUDE 48 0 E DATA PROCESSING CENTER ELEVATION 7.8 M MEANS AND EXTREMES FOR THE YEAR 1991 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 11.3 13.1 18.2 25.9 29.7 35.5 36.9 36.0 32.8 27.3 20.8 13.5 25.1 MINIMUN AIR TEMPERATURE (C) 6.1 5.6 11.1 14.9 16.7 21.2 22.9 23.1 19.2 17.1 10.9 8.4 14.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 5 15 25 27 10 1 0 0 83 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 0 4 0 0 0 0 0 0 0 0 0 0 4 TEMPERATURE RECORDS LOWEST(C) 0.6 -1.8 4.0 9.4 10.2 15.6 19.4 18.2 12.4 11.4 4.0 0.6 -1.8 DAY 29 10 11 14 12 1 16 30 16 24 27 19 MAXIMUM AIR TEMPERATURE (C) 15.3 18.1 22.9 32.1 36.5 43.0 44.8 43.4 41.0 33.6 27.3 18.0 31.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 1 20 31 30 31 31 30 27 4 0 205 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 21.4 21.4 30.2 39.2 40.0 48.0 49.0 47.2 43.6 40.2 34.0 24.2 49.0 DAY 31 15 31 27 9 24 21 9 15 13 1 12 DIF. BETWEEN (MAX.-MIN.) (C) 9.2 12.5 11.8 17.2 19.8 21.8 21.9 20.3 21.8 16.5 16.4 9.6 16.5 MEAN DAILY TEMP. (MDT) (C) 10.7 11.9 17.0 23.5 26.6 32.1 33.8 33.2 30.1 25.4 19.1 13.2 23.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 1.7 82.0 173.9 332.6 398.0 379.2 272.7 134.9 21.5 0.0 1796.5 HEATING DEG. DAYS(BASE 18 0C) 225.8 171.8 56.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 25.9 154.7 634.8 DEWPOINT (MEAN C) 7.6 5.3 10.5 11.1 8.9 16.0 16.5 16.8 15.1 13.1 9.2 8.7 11.6 MIXING RATIO (G/KG) 6.63 5.90 8.10 8.59 7.59 12.37 12.37 12.56 11.81 9.72 7.48 7.28 9.20 VAPOUR PRESSURE (HPA) 10.70 9.53 12.99 13.74 12.11 19.42 19.38 19.73 18.67 15.57 12.05 11.73 14.64 SATURATION DEF. (HPA) 3.15 6.29 8.83 21.72 32.19 42.39 47.54 43.30 34.88 22.82 14.27 4.53 23.49 RELATIVE HUMIDITY (MEAN %) 80 63 64 44 32 36 33 35 39 47 50 74 50 RELATIVE HUMIDITY (MAX. %) 92 86 89 70 58 61 55 58 63 71 74 90 72 RELATIVE HUMIDITY (MIN. %) 65 43 45 27 19 22 21 23 24 30 34 58 34 RELATIVE HUMIDITY (MEAN% 03UTC) 92 84 86 70 57 57 55 56 60 70 74 89 71 RELATIVE HUMIDITY (MEAN% 09UTC) 75 53 55 35 22 28 25 27 33 35 40 67 41 RELATIVE HUMIDITY (MEAN% 15UTC) 78 56 54 38 24 31 27 32 33 44 45 73 45 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 101.3 75.4 116.3 13.0 0.0 0.0 0.0 0.0 0.0 25.0 0.0 65.7 396.7 DAYS WITH PRECIPITATION >=10 2 2 6 0 0 0 0 0 0 1 0 4 15 DAYS WITH PRECIPITATION >= 5 2 4 7 1 0 0 0 0 0 2 0 4 20 DAYS WITH PRECIPITATION >= 1 5 6 8 4 0 0 0 0 0 4 0 10 37 DAYS WITH PRECIPITATION 7 7 10 4 0 0 0 0 0 6 0 11 45 GREATEST DAILY PRECIPITATION 79.0 44.0 32.0 6.0 0.0 0.0 0.0 0.0 0.0 10.0 0.0 18.0 79.0 DAY 14 21 13 18 **