STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 1.6 6.3 8.3 18.0 20.6 29.6 33.9 29.5 26.3 20.6 14.7 6.1 18.0 MINIMUN AIR TEMPERATURE (C) -3.0 0.2 1.9 10.4 14.4 21.5 25.8 21.9 18.1 13.2 8.6 1.7 11.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 2 18 30 23 5 0 0 0 78 DAYS WITH MINIMUM TEMP. <=-4 11 2 4 0 0 0 0 0 0 0 0 2 19 DAYS WITH FREEZING MIN.<= 0 26 18 11 0 0 0 0 0 0 0 3 8 66 TEMPERATURE RECORDS LOWEST(C) -10.0 -5.4 -5.2 4.0 5.8 17.0 20.8 15.8 10.5 9.8 -3.0 -6.2 -10.0 DAY 26 13 11 3 2 9 27 31 29 16 27 29 MAXIMUM AIR TEMPERATURE (C) 5.2 10.8 12.7 22.7 25.3 34.3 38.5 34.1 30.9 25.1 19.1 9.4 22.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 1 7 30 31 27 20 0 0 0 116 DAYS WITH MAXIMUM TEMP. <= 0 6 0 0 0 0 0 0 0 0 0 0 0 6 TEMPERATURE RECORDS HIGHEST(C) 13.6 21.8 23.5 30.0 33.5 40.0 43.0 38.8 36.0 28.7 24.4 17.6 43.0 DAY 1 24 30 13 31 30 5 26 25 4 7 17 DIF. BETWEEN (MAX.-MIN.) (C) 8.2 10.6 10.8 12.3 10.9 12.8 12.7 12.2 12.8 11.9 10.5 7.7 11.1 MEAN DAILY TEMP. (MDT) (C) 1.1 5.5 7.3 16.6 19.8 27.9 32.1 28.0 24.5 19.1 13.8 5.6 16.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 1.8 40.5 206.9 344.6 217.2 109.6 7.4 0.0 0.0 928.1 HEATING DEG. DAYS(BASE 18 0C) 524.2 361.8 330.7 60.5 37.0 0.0 0.0 0.0 0.0 14.2 126.0 385.7 1840.0 DEWPOINT (MEAN C) ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** ***** MIXING RATIO (G/KG) ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** VAPOUR PRESSURE (HPA) ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** SATURATION DEF. (HPA) ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** RELATIVE HUMIDITY (MEAN %) *** *** *** *** *** *** *** *** *** *** *** *** *** RELATIVE HUMIDITY (MAX. %) *** *** *** *** *** *** *** *** *** *** *** *** *** RELATIVE HUMIDITY (MIN. %) *** *** *** *** *** *** *** *** *** *** *** *** *** RELATIVE HUMIDITY (MEAN% 03UTC) *** *** *** *** *** *** *** *** *** *** *** *** *** RELATIVE HUMIDITY (MEAN% 09UTC) *** *** *** *** *** *** *** *** *** *** *** *** *** RELATIVE HUMIDITY (MEAN% 15UTC) *** *** *** *** *** *** *** *** *** *** *** *** *** RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 9.7 3.0 21.3 12.5 57.4 3.5 3.3 5.0 0.0 0.0 0.0 38.6 154.3 DAYS WITH PRECIPITATION >=10 0 0 0 0 3 0 0 0 0 0 0 2 5 DAYS WITH PRECIPITATION >= 5 0 0 2 1 5 0 0 1 0 0 0 3 12 DAYS WITH PRECIPITATION >= 1 4 1 4 4 6 1 1 1 0 0 0 3 25 DAYS WITH PRECIPITATION 6 1 7 6 7 2 3 1 0 0 0 5 38 GREATEST DAILY PRECIPITATION 4.0 3.0 9.0 5.0 20.0 3.0 3.0 5.0 0.0 0.0 0.0 23.0 23.0 DAY 17 26 31 25 7 15 9 12 ** ** ** 4 DAY WITH THUNDER STORM 0 0 0 1 0 1 0 1 0 0 0 1 4 DAYS WITH SNOW OR SLEET 6 2 2 0 1 0 0 0 0 0 0 2 13 DAYS WITH DUST 1 1 0 0 0 0 2 0 1 1 4 0 10 WIND DIRECTION (PREVAILING) 315 180 315 315 360 360 45 45 45 180 180 180 45 PREVAILING WIND SPEED(KNOTS) 6.9 13.3 9.6 14.4 8.1 8.8 12.4 10.3 7.6 12.1 12.8 8.8 10.0 PREVAILING WIND PERCENT 11.0 13.1 12.9 9.3 10.3 14.0 32.9 45.5 27.3 16.8 18.0 15.1 15.5 CALMS PERCENT OF WIND 59.4 44.1 52.9 55.3 54.2 35.3 14.2 10.4 19.3 31.0 40.0 56.6 39.4 NO. OF WIND OBSERVATION 155 145 155 150 155 150 155 154 150 155 150 152 1826 VECTOR WIND DIRECTION (MEAN) 263 227 312 290 345 340 60 62 81 87 198 193 54 VECTOR WIND MAGNITUDE(KNOTS) 0.3 2.3 1.8 1.7 1.5 0.8 5.9 6.4 1.8 1.7 2.2 1.1 0.8 WIND STEADINESES (MEAN %) 9.1 35.4 43.9 31.5 27.8 10.5 56.2 72.7 25.7 27.0 34.4 32.4 12.9 WIND SPEED (MEAN KNOTS) 3.3 6.5 4.1 5.4 5.4 7.6 10.5 8.8 7.0 6.3 6.4 3.4 6.2 FASTEST WIND DIRECTION 170 210 290 230 180 200 90 70 180 60 190 210 210 FASTEST WIND SPEED (KNOTS) 25 39 21 29 29 27 39 23 19 19 31 23 39 DAY 16 21 10 22 6 17 20 1 8 27 23 27 DAYS WITH SKY CLEAR (0-2)/8 10 20 12 12 10 22 18 26 27 30 13 11 211 DAYS WITH P.CLOUDY (3-6)/8 14 7 14 14 16 6 13 5 3 1 14 14 121 DAYS WITH CLOUDY (7-8)/8 7 2 5 4 5 2 0 0 0 0 3 6 34 DAYS WITH VISIBILITY =< 2 KM 4 1 0 0 1 0 1 0 0 0 0 1 8 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** 351.3 316.2 284.0 200.2 157.6 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** 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 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 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 ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 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 0900 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 1200 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 ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1992 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 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 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 ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 2.9 6.9 11.0 19.4 24.2 30.8 30.7 30.0 27.6 17.6 9.9 8.4 18.3 MINIMUN AIR TEMPERATURE (C) -1.3 1.3 4.8 12.8 16.9 22.3 24.2 23.0 21.3 12.2 5.2 2.3 12.1 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 5 23 30 26 18 0 0 0 102 DAYS WITH MINIMUM TEMP. <=-4 3 1 0 0 0 0 0 0 0 0 0 1 5 DAYS WITH FREEZING MIN.<= 0 25 13 3 0 0 0 0 0 0 0 6 6 53 TEMPERATURE RECORDS LOWEST(C) -5.0 -4.8 -1.0 9.5 9.6 18.0 20.8 17.6 15.0 7.0 -2.8 -4.2 -5.0 DAY 9 17 23 14 8 6 19 4 28 9 30 1 MAXIMUM AIR TEMPERATURE (C) 6.1 11.1 15.3 23.7 28.7 35.6 36.8 36.3 34.1 23.7 15.5 12.5 23.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 2 14 30 31 31 29 2 0 0 139 DAYS WITH MAXIMUM TEMP. <= 0 1 0 0 0 0 0 0 0 0 0 0 0 1 TEMPERATURE RECORDS HIGHEST(C) 17.6 22.0 23.2 31.8 34.4 39.4 40.2 40.2 38.6 33.0 24.5 16.6 40.2 DAY 29 28 31 20 27 18 3 14 3 1 1 29 DIF. BETWEEN (MAX.-MIN.) (C) 7.4 9.8 10.5 10.9 11.8 13.3 12.6 13.3 12.8 11.5 10.3 10.2 11.2 MEAN DAILY TEMP. (MDT) (C) 2.4 6.2 10.1 18.3 22.8 28.9 30.5 29.7 27.7 17.9 10.3 7.4 17.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 11.7 79.6 237.9 294.6 269.1 200.2 11.5 0.0 0.0 1104.7 HEATING DEG. DAYS(BASE 18 0C) 483.2 330.7 245.8 28.1 3.3 0.0 0.0 0.0 0.0 30.7 229.5 328.4 1679.7 DEWPOINT (MEAN C) ***** ***** -2.8 1.5 1.9 2.5 6.6 2.6 -1.3 -4.7 -1.6 -3.1 ***** MIXING RATIO (G/KG) ****** ****** 3.85 5.24 5.22 5.76 7.26 5.47 4.17 3.31 4.15 3.52 ****** VAPOUR PRESSURE (HPA) ****** ****** 5.37 7.28 7.26 7.97 10.03 7.60 5.81 4.65 5.81 4.95 ****** SATURATION DEF. (HPA) ****** ****** 8.28 16.15 24.06 37.93 35.24 36.05 32.40 16.20 7.20 6.38 ****** RELATIVE HUMIDITY (MEAN %) *** *** 42 36 26 19 23 19 16 24 48 46 *** RELATIVE HUMIDITY (MAX. %) *** *** 64 52 41 27 33 27 23 34 65 59 *** RELATIVE HUMIDITY (MIN. %) *** *** 30 26 18 14 16 13 11 17 35 37 *** RELATIVE HUMIDITY (MEAN% 03UTC) *** *** 57 49 38 27 32 25 22 30 59 58 *** RELATIVE HUMIDITY (MEAN% 09UTC) *** *** 34 31 22 18 20 16 14 19 40 41 *** RELATIVE HUMIDITY (MEAN% 15UTC) *** *** 41 33 23 16 17 14 14 21 43 47 *** RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 35.5 12.5 26.9 24.0 2.7 0.0 0.0 0.0 0.0 0.0 3.3 4.0 108.9 DAYS WITH PRECIPITATION >=10 1 0 1 0 0 0 0 0 0 0 0 0 2 DAYS WITH PRECIPITATION >= 5 4 0 2 2 0 0 0 0 0 0 0 0 8 DAYS WITH PRECIPITATION >= 1 6 4 4 6 1 0 0 0 0 0 2 1 24 DAYS WITH PRECIPITATION 9 9 8 8 4 0 0 0 0 0 3 1 42 GREATEST DAILY PRECIPITATION 10.7 4.0 16.0 6.0 2.0 0.0 0.0 0.0 0.0 0.0 2.3 4.0 16.0 DAY 7 6 9 27 6 ** ** ** ** ** 27 16 DAY WITH THUNDER STORM 0 0 0 2 1 0 0 0 0 0 0 0 3 DAYS WITH SNOW OR SLEET 8 2 0 0 0 0 0 0 0 0 0 0 10 DAYS WITH DUST 1 0 2 4 7 2 1 3 2 0 2 0 24 WIND DIRECTION (PREVAILING) 180 315 45 180 315 45 45 45 180 180 180 180 180 PREVAILING WIND SPEED(KNOTS) 9.5 8.9 10.5 13.1 10.5 11.9 12.0 11.3 11.9 10.6 10.9 8.8 11.1 PREVAILING WIND PERCENT 12.9 16.4 16.1 17.3 16.8 19.3 22.6 23.8 31.7 28.2 22.5 20.0 18.2 CALMS PERCENT OF WIND 56.8 40.7 38.7 20.0 18.7 10.0 19.4 18.1 17.9 34.3 47.5 58.1 30.8 NO. OF WIND OBSERVATION 155 140 155 150 155 150 248 248 240 248 240 155 2284 VECTOR WIND DIRECTION (MEAN) 227 282 53 265 337 25 66 78 133 145 202 191 93 VECTOR WIND MAGNITUDE(KNOTS) 1.2 1.3 0.4 1.1 1.8 3.8 4.5 4.4 3.6 2.1 2.9 1.2 0.7 WIND STEADINESES (MEAN %) 32.4 24.1 5.8 12.1 19.4 38.0 53.6 54.3 42.4 35.6 63.0 44.4 10.1 WIND SPEED (MEAN KNOTS) 3.7 5.4 6.9 9.1 9.3 10.0 8.4 8.1 8.5 5.9 4.6 2.7 6.9 FASTEST WIND DIRECTION 180 200 180 240 230 80 60 60 60 60 210 160 210 FASTEST WIND SPEED (KNOTS) 23 23 35 29 31 25 29 21 25 23 43 23 43 DAY 29 3 8 8 3 25 8 6 3 5 12 27 DAYS WITH SKY CLEAR (0-2)/8 15 10 10 7 5 28 28 25 29 19 13 15 204 DAYS WITH P.CLOUDY (3-6)/8 6 8 14 15 18 2 3 6 1 12 9 11 105 DAYS WITH CLOUDY (7-8)/8 10 10 7 8 8 0 0 0 0 0 8 5 56 DAYS WITH VISIBILITY =< 2 KM 5 2 0 1 0 0 0 0 0 0 4 1 13 DURATION OF SUNSHINE HOURS 153.3 166.3 218.3 232.4 270.4 381.2 374.5 350.8 187.7 ****** ****** 159.5 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA ****** ****** 874.7 873.4 873.6 870.5 870.0 871.7 873.3 880.2 877.9 879.4 ****** MAX. QFE PRESSURE IN HPA ****** ****** 882.2 880.4 880.0 879.2 876.5 876.8 880.4 886.5 884.7 885.8 ****** DAY-HOUR **-** **-** 31- 6 1- 6 9- 6 23- 6 27- 6 31- 6 23- 6 17- 6 21- 6 26- 6 MIN. QFE PRESSURE IN HPA ****** ****** 866.9 866.9 867.9 864.4 863.6 864.2 867.2 872.7 867.0 871.3 ****** DAY-HOUR **-** **-** 5-15 12-15 31-12 3-15 12-15 12-15 3-15 2-12 14- 3 5-12 MEAN QNH PRESSURE IN HPA ****** ****** 1016.5 1015.1 1015.3 1011.7 1011.1 1013.1 1015.0 1022.7 1020.1 1021.9 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1025.0 1022.9 1022.5 1021.6 1018.5 1018.9 1022.9 1029.8 1027.8 1029.0 ****** DAY-HOUR **-** **-** 31- 6 1- 6 9- 6 23- 6 27- 6 31- 6 23- 6 17- 6 21- 6 26- 6 MIN. QNH PRESSURE IN HPA ****** ****** 1007.7 1007.7 1008.8 1004.9 1004.0 1004.6 1008.0 1014.2 1007.8 1012.7 ****** DAY-HOUR **-** **-** 5-15 12-15 31-12 3-15 12-15 12-15 3-15 2-12 14- 3 5-12 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 998.9 1001.4 1004.4 1017.2 1018.4 ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1006.2 1008.5 1013.9 1024.5 1028.9 ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** 27- 6 25- 3 23- 6 17- 6 30- 9 **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 991.2 992.7 995.7 1004.8 1002.6 ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** 12-12 12-12 3-12 2-12 14- 0 **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 869.9 871.6 873.0 880.0 877.5 ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 874.4 875.3 877.8 884.6 883.3 ****** ****** DAY ** ** ** ** ** ** 27 31 16 17 21 ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 865.1 866.3 869.5 873.8 867.9 ****** ****** DAY ** ** ** ** ** ** 12 13 14 3 14 ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1011.1 1013.0 1014.6 1022.5 1019.6 ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1016.2 1017.2 1020.0 1027.7 1026.2 ****** ****** DAY ** ** ** ** ** ** 27 31 16 17 21 ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1005.7 1007.0 1010.6 1015.5 1008.8 ****** ****** DAY ** ** ** ** ** ** 12 13 14 3 14 ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 998.8 1001.1 1003.8 1016.7 1017.5 ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1004.2 1006.8 1010.2 1022.6 1027.7 ****** ****** DAY ** ** ** ** ** ** 27 25 17 8 30 ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 992.6 994.5 998.0 1006.4 1002.6 ****** ****** DAY ** ** ** ** ** ** 12 12 4 3 14 ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 875.0 874.1 874.4 871.6 870.9 872.6 874.1 880.7 878.0 879.7 ****** MAX. QFE PRESSURE IN HPA ****** ****** 880.9 879.8 879.6 879.0 875.7 876.2 879.1 885.6 883.6 884.8 ****** DAY ** ** 31 1 9 23 27 31 16 17 21 27 MIN. QFE PRESSURE IN HPA ****** ****** 867.0 869.9 870.7 868.3 866.0 867.1 870.5 874.9 867.0 873.0 ****** DAY ** ** 22 13 13 4 12 12 3 2 14 5 MEAN QNH PRESSURE IN HPA ****** ****** 1016.9 1015.9 1016.1 1013.0 1012.2 1014.2 1015.9 1023.3 1020.3 1022.1 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1023.5 1022.3 1022.0 1021.4 1017.6 1018.2 1021.5 1028.8 1026.6 1027.9 ****** DAY ** ** 31 1 9 23 27 31 16 17 21 27 MIN. QNH PRESSURE IN HPA ****** ****** 1007.8 1011.1 1012.0 1009.3 1006.7 1007.9 1011.8 1016.7 1007.8 1014.6 ****** DAY ** ** 22 13 13 4 12 12 3 2 14 5 MEAN QFF PRESSURE IN HPA ****** ****** 1015.7 1010.2 1008.1 1001.7 1000.1 1002.8 1005.9 1018.3 1018.9 1022.7 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1024.7 1016.9 1016.7 1012.2 1006.0 1008.5 1012.8 1024.3 1028.8 1028.8 ****** DAY ** ** 23 1 9 23 27 25 23 17 30 7 MIN. QFF PRESSURE IN HPA ****** ****** 1007.4 1004.7 1003.3 997.6 994.5 995.9 1000.0 1008.0 1003.0 1016.3 ****** DAY ** ** 8 21 29 16 12 12 3 2 14 5 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 876.0 874.8 874.9 872.1 871.5 873.4 875.2 881.8 879.1 880.5 ****** MAX. QFE PRESSURE IN HPA ****** ****** 882.2 880.4 880.0 879.2 876.5 876.8 880.4 886.5 884.7 885.8 ****** DAY ** ** 31 1 9 23 27 31 23 17 21 26 MIN. QFE PRESSURE IN HPA ****** ****** 869.5 870.1 870.8 869.1 866.9 867.8 870.7 876.3 871.1 873.8 ****** DAY ** ** 22 27 7 3 12 12 3 1 11 5 MEAN QNH PRESSURE IN HPA ****** ****** 1018.0 1016.6 1016.7 1013.6 1012.9 1015.0 1017.0 1024.5 1021.4 1023.0 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1025.0 1022.9 1022.5 1021.6 1018.5 1018.9 1022.9 1029.8 1027.8 1029.0 ****** DAY ** ** 31 1 9 23 27 31 23 17 21 26 MIN. QNH PRESSURE IN HPA ****** ****** 1010.6 1011.3 1012.1 1010.2 1007.7 1008.7 1012.0 1018.3 1012.4 1015.5 ****** DAY ** ** 22 27 7 3 12 12 3 1 11 5 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1000.7 1003.3 1006.5 1019.0 1019.7 ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1006.2 1008.2 1013.9 1024.5 1028.9 ****** ****** DAY ** ** ** ** ** ** 27 24 23 17 30 ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 995.8 996.1 999.4 1008.7 1006.7 ****** ****** DAY ** ** ** ** ** ** 12 12 3 1 11 ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 875.1 873.7 874.0 871.0 870.5 872.4 873.9 880.5 877.9 879.4 ****** MAX. QFE PRESSURE IN HPA ****** ****** 881.3 878.9 879.8 878.3 875.8 875.8 879.2 885.3 883.8 884.2 ****** DAY ** ** 31 16 9 23 27 30 23 17 21 26 MIN. QFE PRESSURE IN HPA ****** ****** 868.9 868.9 869.7 867.7 865.8 866.7 869.5 874.8 869.6 872.2 ****** DAY ** ** 12 13 31 3 12 12 3 1 11 5 MEAN QNH PRESSURE IN HPA ****** ****** 1017.0 1015.4 1015.7 1012.3 1011.8 1013.9 1015.6 1023.0 1020.1 1021.8 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1024.0 1021.3 1022.3 1020.6 1017.7 1017.7 1021.6 1028.5 1026.8 1027.2 ****** DAY ** ** 31 16 9 23 27 30 23 17 21 26 MIN. QNH PRESSURE IN HPA ****** ****** 1010.0 1010.0 1010.9 1008.6 1006.5 1007.5 1010.6 1016.6 1010.7 1013.7 ****** DAY ** ** 12 13 31 3 12 12 3 1 11 5 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 999.4 1001.8 1004.7 1017.3 1018.1 ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1005.9 1006.5 1011.9 1022.8 1028.9 ****** ****** DAY ** ** ** ** ** ** 27 24 23 17 30 ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 994.1 995.2 997.9 1007.0 1003.7 ****** ****** DAY ** ** ** ** ** ** 12 12 3 1 11 ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 873.6 872.2 872.5 869.1 868.9 870.6 872.1 879.1 877.2 878.6 ****** MAX. QFE PRESSURE IN HPA ****** ****** 879.5 878.2 877.6 876.6 874.5 874.0 877.6 883.9 882.8 884.2 ****** DAY ** ** 30 16 9 22 27 30 23 17 21 26 MIN. QFE PRESSURE IN HPA ****** ****** 867.7 867.2 867.9 865.2 863.9 864.7 867.4 872.7 869.1 871.3 ****** DAY ** ** 8 13 31 3 12 12 3 2 13 5 MEAN QNH PRESSURE IN HPA ****** ****** 1015.3 1013.7 1014.0 1010.2 1010.0 1011.8 1013.6 1021.4 1019.3 1020.9 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1021.9 1020.5 1019.8 1018.7 1016.3 1015.7 1019.8 1026.9 1025.7 1027.2 ****** DAY ** ** 30 16 9 22 27 30 23 17 21 26 MIN. QNH PRESSURE IN HPA ****** ****** 1008.6 1008.0 1008.8 1005.8 1004.3 1005.2 1008.3 1014.2 1010.2 1012.7 ****** DAY ** ** 8 13 31 3 12 12 3 2 13 5 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 997.7 999.9 1002.8 1015.6 1017.3 ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1004.5 1005.0 1010.2 1021.4 1026.5 ****** ****** DAY ** ** ** ** ** ** 27 25 23 8 30 ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 991.2 992.7 995.7 1004.8 1003.8 ****** ****** DAY ** ** ** ** ** ** 12 12 3 2 13 ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1993 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 873.9 872.4 872.5 868.7 868.4 870.2 872.1 879.4 877.7 879.2 ****** MAX. QFE PRESSURE IN HPA ****** ****** 879.4 878.5 877.3 876.1 873.8 874.2 877.3 884.3 883.2 884.6 ****** DAY ** ** 30 16 9 22 27 30 23 17 21 26 MIN. QFE PRESSURE IN HPA ****** ****** 866.9 866.9 868.9 864.4 863.6 864.2 867.2 872.7 869.2 872.7 ****** DAY ** ** 5 12 31 3 12 12 3 2 13 4 MEAN QNH PRESSURE IN HPA ****** ****** 1015.7 1013.9 1014.0 1009.7 1009.4 1011.4 1013.5 1021.8 1019.9 1021.6 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1021.8 1020.8 1019.4 1018.1 1015.5 1015.9 1019.4 1027.3 1026.1 1027.7 ****** DAY ** ** 30 16 9 22 27 30 23 17 21 26 MIN. QNH PRESSURE IN HPA ****** ****** 1007.7 1007.7 1010.0 1004.9 1004.0 1004.6 1008.0 1014.2 1010.3 1014.2 ****** DAY ** ** 5 12 31 3 12 12 3 2 13 4 MEAN QFF PRESSURE IN HPA ****** ****** 1014.4 1008.2 1005.9 998.3 997.3 1000.0 1003.5 1016.8 1018.7 1022.0 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1023.1 1014.5 1014.1 1008.9 1004.2 1005.3 1010.9 1022.8 1028.3 1028.3 ****** DAY ** ** 23 16 9 22 27 25 23 17 30 6 MIN. QFF PRESSURE IN HPA ****** ****** 1004.2 999.8 1000.0 992.4 991.6 992.7 996.1 1005.6 1005.9 1015.0 ****** DAY ** ** 5 20 31 15 12 12 3 2 10 5 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 869.7 871.6 873.3 880.3 878.0 ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 874.9 875.8 877.8 885.0 883.7 ****** ****** DAY ** ** ** ** ** ** 27 30 23 17 21 ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 865.2 866.1 868.6 873.8 867.7 ****** ****** DAY ** ** ** ** ** ** 12 12 3 2 13 ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1010.8 1013.0 1014.9 1022.9 1020.2 ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1016.7 1017.7 1020.0 1028.1 1026.7 ****** ****** DAY ** ** ** ** ** ** 27 30 23 17 21 ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1005.8 1006.8 1009.6 1015.5 1008.6 ****** ****** DAY ** ** ** ** ** ** 12 12 3 2 13 ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 998.6 1001.2 1004.4 1017.4 1018.7 ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1004.7 1006.2 1010.9 1023.1 1027.0 ****** ****** DAY ** ** ** ** ** ** 27 24 23 17 29 ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 993.7 994.0 997.1 1005.7 1004.1 ****** ****** DAY ** ** ** ** ** ** 12 12 3 2 10 ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 869.9 871.6 873.2 880.2 877.9 ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 874.3 876.0 877.5 884.8 883.6 ****** ****** DAY ** ** ** ** ** ** 27 30 15 16 21 ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 865.2 866.0 868.6 874.0 867.2 ****** ****** DAY ** ** ** ** ** ** 12 12 3 2 13 ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1011.1 1013.1 1014.8 1022.7 1020.1 ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1016.1 1018.0 1019.7 1027.9 1026.6 ****** ****** DAY ** ** ** ** ** ** 27 30 15 16 21 ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1005.8 1006.7 1009.6 1015.7 1008.0 ****** ****** DAY ** ** ** ** ** ** 12 12 3 2 13 ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 998.7 1001.0 1004.0 1017.0 1018.3 ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 1004.2 1006.6 1010.4 1022.6 1027.9 ****** ****** DAY ** ** ** ** ** ** 26 24 16 8 29 ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** 993.2 994.3 996.7 1006.8 1003.2 ****** ****** DAY ** ** ** ** ** ** 3 12 3 2 13 ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 7.6 8.1 14.1 20.6 25.1 30.8 33.9 33.6 24.8 19.5 15.3 5.4 19.9 MINIMUN AIR TEMPERATURE (C) 2.0 1.3 7.8 13.5 17.1 22.1 25.7 25.2 17.2 13.6 9.4 -0.8 12.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 5 22 31 31 4 0 0 0 93 DAYS WITH MINIMUM TEMP. <=-4 0 1 0 0 0 0 0 0 0 0 0 12 13 DAYS WITH FREEZING MIN.<= 0 6 10 0 0 0 0 0 0 0 0 0 17 33 TEMPERATURE RECORDS LOWEST(C) -2.2 -5.2 3.5 4.2 12.2 16.0 21.6 21.4 11.6 10.2 2.8 -10.2 -10.2 DAY 20 4 15 5 7 5 1 26 21 9 27 7 MAXIMUM AIR TEMPERATURE (C) 11.5 13.0 18.7 25.2 29.5 35.6 38.7 38.5 29.3 23.6 19.6 9.7 24.4 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 5 15 30 31 31 12 0 0 0 124 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 19.4 19.4 24.5 33.4 34.0 39.0 42.6 41.4 33.8 29.0 24.4 20.6 42.6 DAY 4 28 31 25 30 16 30 5 1 1 8 20 DIF. BETWEEN (MAX.-MIN.) (C) 9.5 11.7 10.9 11.7 12.4 13.5 13.0 13.3 12.1 10.0 10.2 10.5 11.6 MEAN DAILY TEMP. (MDT) (C) 6.8 7.2 13.2 19.3 23.3 28.8 32.2 31.8 23.2 18.6 14.5 4.5 18.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 25.3 83.6 235.0 346.8 335.6 75.1 4.7 0.0 0.0 1106.2 HEATING DEG. DAYS(BASE 18 0C) 348.4 303.1 148.8 28.8 0.5 0.0 0.0 0.0 0.0 14.2 111.3 419.5 1374.5 DEWPOINT (MEAN C) -3.4 -5.3 -3.1 -0.8 1.1 2.5 7.0 5.4 0.2 4.8 0.8 -7.2 0.2 MIXING RATIO (G/KG) 3.54 3.06 3.80 4.39 4.96 5.62 7.64 6.87 4.69 6.54 4.87 2.80 4.90 VAPOUR PRESSURE (HPA) 4.96 4.27 5.30 6.12 6.90 7.76 10.51 9.47 6.56 9.14 6.80 3.93 6.81 SATURATION DEF. (HPA) 5.84 7.07 11.46 19.30 25.96 37.86 44.15 43.94 25.79 14.08 11.05 5.68 21.01 RELATIVE HUMIDITY (MEAN %) 49 42 36 27 24 18 21 19 22 42 39 42 32 RELATIVE HUMIDITY (MAX. %) 65 59 53 43 37 26 33 26 30 54 51 56 44 RELATIVE HUMIDITY (MIN. %) 38 30 25 17 16 13 14 14 16 33 31 32 23 RELATIVE HUMIDITY (MEAN% 03UTC) 62 56 50 40 35 25 32 25 29 53 47 51 42 RELATIVE HUMIDITY (MEAN% 09UTC) 45 37 31 23 19 17 19 17 19 37 35 38 28 RELATIVE HUMIDITY (MEAN% 15UTC) 49 40 32 26 21 14 16 15 19 41 38 42 29 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 11.0 8.3 30.9 5.7 2.4 0.0 0.0 0.0 0.0 6.7 0.9 0.1 66.0 DAYS WITH PRECIPITATION >=10 0 0 1 0 0 0 0 0 0 0 0 0 1 DAYS WITH PRECIPITATION >= 5 1 1 1 0 0 0 0 0 0 1 0 0 4 DAYS WITH PRECIPITATION >= 1 3 2 5 3 2 0 0 0 0 2 0 0 17 DAYS WITH PRECIPITATION 5 4 7 5 3 0 0 0 0 4 2 3 33 GREATEST DAILY PRECIPITATION 5.0 6.0 19.0 2.0 1.0 0.0 0.0 0.0 0.0 5.0 0.8 0.1 19.0 DAY 24 19 27 28 1 ** ** ** ** 17 17 26 DAY WITH THUNDER STORM 0 0 1 3 1 0 0 0 0 1 0 0 6 DAYS WITH SNOW OR SLEET 1 1 0 0 0 0 0 0 0 0 0 2 4 DAYS WITH DUST 1 1 4 12 13 13 13 1 5 1 2 5 71 WIND DIRECTION (PREVAILING) 180 180 315 360 360 45 45 45 45 180 180 180 45 PREVAILING WIND SPEED(KNOTS) 12.1 9.3 8.4 7.4 8.0 12.3 12.7 12.6 9.5 10.7 13.4 10.7 10.5 PREVAILING WIND PERCENT 18.1 18.6 20.0 22.0 20.6 24.0 42.6 40.0 47.3 14.2 20.0 14.8 20.1 CALMS PERCENT OF WIND 41.3 31.4 28.4 18.0 20.6 13.3 14.2 14.8 18.0 45.8 46.7 54.2 28.9 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 180 200 253 306 21 53 57 64 61 72 202 217 72 VECTOR WIND MAGNITUDE(KNOTS) 1.0 0.6 0.7 0.7 0.2 3.6 7.7 7.0 4.1 1.0 3.6 2.4 1.4 WIND STEADINESES (MEAN %) 20.0 10.3 10.3 8.1 2.3 37.5 75.5 71.4 53.9 21.3 60.0 47.1 19.2 WIND SPEED (MEAN KNOTS) 5.0 5.8 6.8 8.6 8.6 9.6 10.2 9.8 7.6 4.7 6.0 5.1 7.3 FASTEST WIND DIRECTION 170 200 210 240 190 270 60 100 30 180 210 210 210 FASTEST WIND SPEED (KNOTS) 47 27 43 39 29 35 25 39 23 21 33 51 51 DAY 4 1 7 2 5 3 17 27 2 13 5 20 DAYS WITH SKY CLEAR (0-2)/8 12 17 14 14 16 28 27 30 27 10 13 20 228 DAYS WITH P.CLOUDY (3-6)/8 11 9 13 10 13 2 4 1 3 17 9 8 100 DAYS WITH CLOUDY (7-8)/8 8 2 4 6 2 0 0 0 0 4 8 3 37 DAYS WITH VISIBILITY =< 2 KM 2 0 0 1 0 1 0 0 1 0 0 1 6 DURATION OF SUNSHINE HOURS ****** ****** ****** 139.0 300.1 ****** 332.4 363.0 302.1 238.2 185.0 232.3 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 876.8 873.8 874.1 874.9 873.4 868.1 866.3 868.2 877.0 879.4 876.6 878.2 873.9 MAX. QFE PRESSURE IN HPA 886.2 882.8 880.5 886.0 879.5 874.5 872.1 874.0 885.7 885.6 884.8 885.2 886.2 DAY-HOUR 10- 6 19- 6 18- 6 5- 6 18- 6 9- 6 2- 6 15- 6 23- 6 9- 6 2- 6 8- 3 MIN. QFE PRESSURE IN HPA 864.4 863.6 863.6 866.0 866.2 861.8 861.0 862.4 868.6 873.0 867.0 863.2 861.0 DAY-HOUR 16-12 1- 6 12-12 2-12 1-12 4-12 20-15 2-15 2-12 2-12 26- 3 3-15 MEAN QNH PRESSURE IN HPA 1018.9 1015.5 1015.8 1016.7 1015.1 1009.0 1007.0 1009.1 1019.1 1021.8 1018.6 1020.5 1015.6 MAX. QNH PRESSURE IN HPA 1029.5 1025.7 1023.1 1029.3 1021.9 1016.3 1013.6 1015.7 1028.9 1028.8 1027.9 1028.4 1029.5 DAY-HOUR 10- 6 19- 6 18- 6 5- 6 18- 6 9- 6 2- 6 15- 6 23- 6 9- 6 2- 6 8- 3 MIN. QNH PRESSURE IN HPA 1004.9 1004.0 1004.0 1006.7 1006.9 1001.9 1001.0 1002.6 1009.6 1014.6 1007.8 1003.5 1001.0 DAY-HOUR 16-12 1- 6 12-12 2-12 1-12 4-12 20-15 2-15 2-12 2-12 26- 3 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 877.0 874.1 874.4 875.5 874.3 869.4 867.5 869.1 877.5 879.8 876.8 878.4 874.5 MAX. QFE PRESSURE IN HPA 885.5 881.2 878.9 883.7 879.0 873.8 871.8 873.0 884.6 884.8 882.7 885.2 885.5 DAY 10 20 19 5 18 9 2 16 23 10 2 8 MIN. QFE PRESSURE IN HPA 868.9 864.8 865.9 869.7 868.8 865.1 863.6 864.2 870.7 875.9 867.0 864.2 863.6 DAY 16 1 12 2 1 22 21 1 3 14 26 4 MEAN QNH PRESSURE IN HPA 1019.1 1015.8 1016.1 1017.4 1016.0 1010.5 1008.3 1010.2 1019.7 1022.2 1018.8 1020.7 1016.2 MAX. QNH PRESSURE IN HPA 1028.7 1023.9 1021.3 1026.7 1021.4 1015.5 1013.2 1014.6 1027.7 1027.9 1025.5 1028.4 1028.7 DAY 10 20 19 5 18 9 2 16 23 10 2 8 MIN. QNH PRESSURE IN HPA 1010.0 1005.3 1006.6 1010.9 1009.8 1005.7 1004.0 1004.6 1012.0 1017.9 1007.8 1004.6 1004.0 DAY 16 1 12 2 1 22 21 1 3 14 26 4 MEAN QFF PRESSURE IN HPA 1019.8 1016.3 1013.3 1011.3 1007.8 999.1 995.3 997.7 1011.7 1016.6 1015.4 1022.9 1010.6 MAX. QFF PRESSURE IN HPA 1030.8 1027.7 1019.6 1025.0 1014.1 1004.8 1002.4 1002.6 1022.1 1023.9 1023.0 1035.3 1035.3 DAY 10 19 17 5 18 9 2 16 23 10 10 8 MIN. QFF PRESSURE IN HPA 1009.4 1002.4 1003.6 1003.3 1003.0 993.3 990.0 990.2 1001.5 1010.7 1004.5 1001.5 990.0 DAY 5 1 7 26 13 22 21 1 3 2 26 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 878.0 875.1 875.5 876.2 874.8 869.8 867.9 869.9 878.5 880.8 878.0 879.3 875.3 MAX. QFE PRESSURE IN HPA 886.2 882.8 880.5 886.0 879.5 874.5 872.1 874.0 885.7 885.6 884.8 885.2 886.2 DAY 10 19 18 5 18 9 2 15 23 9 2 8 MIN. QFE PRESSURE IN HPA 869.1 863.6 867.9 868.9 869.6 865.8 864.3 864.7 872.3 876.5 869.7 864.9 863.6 DAY 16 1 12 2 1 22 21 1 1 2 26 4 MEAN QNH PRESSURE IN HPA 1020.3 1016.9 1017.4 1018.2 1016.6 1011.0 1008.8 1011.0 1020.8 1023.4 1020.2 1021.7 1017.2 MAX. QNH PRESSURE IN HPA 1029.5 1025.7 1023.1 1029.3 1021.9 1016.3 1013.6 1015.7 1028.9 1028.8 1027.9 1028.4 1029.5 DAY 10 19 18 5 18 9 2 15 23 9 2 8 MIN. QNH PRESSURE IN HPA 1010.2 1004.0 1008.8 1010.0 1010.7 1006.5 1004.8 1005.2 1013.8 1018.5 1010.9 1005.4 1004.0 DAY 16 1 12 2 1 22 21 1 1 2 26 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 877.0 874.0 874.6 875.3 873.6 868.4 866.7 868.5 877.4 879.5 876.6 878.2 874.1 MAX. QFE PRESSURE IN HPA 884.6 881.7 879.9 885.6 878.4 873.7 871.0 872.6 884.7 884.6 883.7 884.2 885.6 DAY 10 19 18 5 18 8 2 22 23 9 2 7 MIN. QFE PRESSURE IN HPA 865.9 864.1 866.6 867.4 868.4 864.7 863.5 863.9 871.0 874.4 869.5 864.6 863.5 DAY 16 1 7 2 1 22 7 1 1 2 26 4 MEAN QNH PRESSURE IN HPA 1019.1 1015.7 1016.4 1017.1 1015.3 1009.4 1007.5 1009.5 1019.6 1021.9 1018.6 1020.4 1015.9 MAX. QNH PRESSURE IN HPA 1027.7 1024.4 1022.4 1028.8 1020.7 1015.4 1012.3 1014.1 1027.8 1027.7 1026.7 1027.2 1028.8 DAY 10 19 18 5 18 8 2 22 23 9 2 7 MIN. QNH PRESSURE IN HPA 1006.6 1004.5 1007.4 1008.3 1009.4 1005.2 1003.9 1004.3 1012.3 1016.2 1010.6 1005.1 1003.9 DAY 16 1 7 2 1 22 7 1 1 2 26 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 875.8 872.7 872.9 873.6 872.3 866.5 864.9 866.8 875.8 878.2 875.5 877.3 872.7 MAX. QFE PRESSURE IN HPA 883.7 880.1 877.9 883.8 876.6 872.2 869.1 871.0 883.0 883.4 882.0 883.8 883.8 DAY 9 19 18 5 18 8 13 22 23 9 2 7 MIN. QFE PRESSURE IN HPA 864.4 865.6 863.6 866.0 866.2 861.8 861.6 862.5 868.6 873.0 869.4 863.7 861.6 DAY 16 12 12 2 1 4 20 2 2 2 26 4 MEAN QNH PRESSURE IN HPA 1017.8 1014.2 1014.4 1015.3 1013.8 1007.2 1005.4 1007.5 1017.7 1020.5 1017.4 1019.4 1014.2 MAX. QNH PRESSURE IN HPA 1026.7 1022.6 1020.1 1026.8 1018.7 1013.7 1010.2 1012.3 1025.9 1026.3 1024.8 1026.8 1026.8 DAY 9 19 18 5 18 8 13 22 23 9 2 7 MIN. QNH PRESSURE IN HPA 1004.9 1006.2 1004.0 1006.7 1006.9 1001.9 1001.7 1002.7 1009.6 1014.6 1010.5 1004.1 1001.7 DAY 16 12 12 2 1 4 20 2 2 2 26 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 ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1994 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 876.5 873.4 873.0 873.8 872.2 866.2 864.4 866.6 875.8 878.8 876.1 878.1 872.9 MAX. QFE PRESSURE IN HPA 884.7 881.2 877.9 883.5 876.2 871.7 868.9 871.0 883.2 883.6 882.3 884.8 884.8 DAY 9 18 18 5 26 8 13 22 23 9 2 7 MIN. QFE PRESSURE IN HPA 866.2 867.5 865.2 866.9 866.3 862.0 861.0 862.4 868.7 873.2 869.6 863.2 861.0 DAY 16 12 12 2 1 28 20 2 2 2 25 3 MEAN QNH PRESSURE IN HPA 1018.5 1015.0 1014.6 1015.5 1013.7 1006.9 1004.9 1007.4 1017.8 1021.2 1018.1 1020.3 1014.5 MAX. QNH PRESSURE IN HPA 1027.8 1023.9 1020.1 1026.4 1018.2 1013.1 1010.0 1012.3 1026.1 1026.6 1025.1 1027.9 1027.9 DAY 9 18 18 5 26 8 13 22 23 9 2 7 MIN. QNH PRESSURE IN HPA 1006.9 1008.4 1005.8 1007.7 1007.0 1002.2 1001.0 1002.6 1009.7 1014.8 1010.7 1003.5 1001.0 DAY 16 12 12 2 1 28 20 2 2 2 25 3 MEAN QFF PRESSURE IN HPA 1019.1 1015.5 1011.7 1009.4 1005.3 995.5 991.8 994.9 1009.7 1015.5 1014.6 1022.5 1008.8 MAX. QFF PRESSURE IN HPA 1029.9 1027.4 1018.5 1025.6 1010.9 1002.6 998.8 1000.8 1020.2 1022.6 1021.6 1035.6 1035.6 DAY 9 18 17 5 18 8 2 22 23 9 10 7 MIN. QFF PRESSURE IN HPA 1006.8 1008.5 1001.2 1001.5 1000.6 990.8 987.3 989.1 999.3 1007.0 1006.4 1000.7 987.3 DAY 16 9 7 26 12 26 20 1 2 2 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 ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 8.8 9.6 14.1 19.2 23.9 29.5 34.7 34.4 28.0 20.2 15.1 5.1 20.2 MINIMUN AIR TEMPERATURE (C) 2.1 3.7 7.4 13.0 17.1 21.9 27.0 25.7 20.4 13.2 8.3 0.5 13.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 20 31 31 18 1 0 0 101 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 0 0 DAYS WITH FREEZING MIN.<= 0 8 4 0 0 0 0 0 0 0 0 4 16 32 TEMPERATURE RECORDS LOWEST(C) -2.2 -0.4 0.8 7.2 12.2 13.0 22.5 21.0 12.6 8.0 -1.8 -2.2 -2.2 DAY 24 16 6 7 9 1 1 10 22 18 30 22 MAXIMUM AIR TEMPERATURE (C) 13.0 13.7 18.6 23.4 28.3 34.3 39.5 39.1 32.9 24.8 19.9 8.4 24.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 12 26 31 31 25 5 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) 20.0 19.8 28.6 29.5 34.5 40.6 43.5 41.6 36.4 33.8 26.7 13.6 43.5 DAY 17 8 25 3 7 22 16 6 9 4 11 1 DIF. BETWEEN (MAX.-MIN.) (C) 10.9 10.0 11.2 10.4 11.2 12.4 12.5 13.4 12.5 11.6 11.6 7.9 11.3 MEAN DAILY TEMP. (MDT) (C) 7.5 8.7 13.0 18.2 22.7 28.1 33.3 32.4 26.7 19.0 14.1 4.5 19.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 1.0 7.7 75.1 213.9 380.0 353.3 171.3 29.1 0.7 0.0 1232.2 HEATING DEG. DAYS(BASE 18 0C) 323.9 259.9 160.6 30.3 4.3 0.0 0.0 0.0 0.0 39.3 130.8 418.8 1367.9 DEWPOINT (MEAN C) -5.9 -7.2 -7.6 -0.6 1.4 5.9 1.4 7.1 0.8 -3.2 -8.5 -3.7 -1.7 MIXING RATIO (G/KG) 2.92 2.72 2.87 4.67 5.32 6.90 5.18 8.39 4.94 3.70 2.55 3.43 4.47 VAPOUR PRESSURE (HPA) 4.11 3.80 4.01 6.49 7.41 9.54 7.15 11.52 6.87 5.18 3.58 4.82 6.21 SATURATION DEF. (HPA) 7.55 8.58 12.76 16.46 23.35 33.10 49.60 44.17 32.33 19.73 14.67 4.16 22.20 RELATIVE HUMIDITY (MEAN %) 37 33 26 32 29 25 14 22 19 23 20 57 28 RELATIVE HUMIDITY (MAX. %) 47 46 41 49 40 35 20 29 28 32 26 70 39 RELATIVE HUMIDITY (MIN. %) 28 23 18 22 21 17 9 17 14 17 15 46 21 RELATIVE HUMIDITY (MEAN% 03UTC) 45 42 38 46 39 35 20 27 27 31 25 68 37 RELATIVE HUMIDITY (MEAN% 09UTC) 34 29 23 26 25 22 13 20 17 20 18 53 25 RELATIVE HUMIDITY (MEAN% 15UTC) 37 31 23 31 25 19 10 19 17 22 20 55 26 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 2.1 9.0 23.0 34.9 40.6 0.6 0.0 0.0 0.2 0.0 0.0 11.6 122.0 DAYS WITH PRECIPITATION >=10 0 0 1 0 1 0 0 0 0 0 0 0 2 DAYS WITH PRECIPITATION >= 5 0 1 1 4 2 0 0 0 0 0 0 1 9 DAYS WITH PRECIPITATION >= 1 1 2 2 6 5 0 0 0 0 0 0 4 20 DAYS WITH PRECIPITATION 1 5 7 10 5 2 0 0 1 0 0 6 37 GREATEST DAILY PRECIPITATION 2.1 6.1 21.0 9.0 31.0 0.6 0.0 0.0 0.2 0.0 0.0 6.6 31.0 DAY 1 24 21 23 29 6 ** ** 22 ** ** 12 DAY WITH THUNDER STORM 0 0 0 1 1 2 0 0 1 0 0 0 5 DAYS WITH SNOW OR SLEET 0 1 0 0 0 0 0 0 0 0 0 1 2 DAYS WITH DUST 0 1 4 6 7 4 13 1 3 4 2 2 47 WIND DIRECTION (PREVAILING) 180 180 180 180 360 360 45 45 45 180 180 180 45 PREVAILING WIND SPEED(KNOTS) 11.5 12.8 13.4 15.1 8.0 9.1 11.7 12.0 9.9 13.4 15.0 8.2 10.1 PREVAILING WIND PERCENT 19.4 16.4 15.5 15.3 17.4 20.7 31.6 36.8 26.7 16.1 18.0 8.4 15.1 CALMS PERCENT OF WIND 59.4 47.1 40.6 40.7 27.7 38.0 25.2 18.7 34.0 41.3 54.7 77.4 42.0 NO. OF WIND OBSERVATION 155 140 155 150 155 150 155 155 150 155 150 155 1825 VECTOR WIND DIRECTION (MEAN) 183 196 208 208 360 353 52 77 69 145 188 160 98 VECTOR WIND MAGNITUDE(KNOTS) 1.7 1.2 1.4 1.6 0.6 1.6 5.7 5.9 2.2 1.4 2.4 0.3 0.9 WIND STEADINESES (MEAN %) 45.9 20.7 22.6 24.2 7.6 25.0 64.8 56.7 31.4 23.3 43.6 18.8 14.3 WIND SPEED (MEAN KNOTS) 3.7 5.8 6.2 6.6 7.9 6.4 8.8 10.4 7.0 6.0 5.5 1.6 6.3 FASTEST WIND DIRECTION 250 210 320 270 300 180 60 180 210 190 180 330 270 FASTEST WIND SPEED (KNOTS) 23 35 37 39 31 27 31 27 27 23 31 16 39 DAY 12 8 17 21 13 6 28 26 20 22 11 4 DAYS WITH SKY CLEAR (0-2)/8 22 13 20 7 13 27 30 30 27 28 23 13 253 DAYS WITH P.CLOUDY (3-6)/8 7 11 5 12 10 3 1 1 3 3 6 8 70 DAYS WITH CLOUDY (7-8)/8 2 4 6 11 8 0 0 0 0 0 1 10 42 DAYS WITH VISIBILITY =< 2 KM 0 1 1 2 0 0 0 0 1 0 0 2 7 DURATION OF SUNSHINE HOURS 240.6 195.7 260.2 227.9 255.6 355.1 378.4 360.5 310.5 298.7 255.5 166.0 3304.7 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 878.2 875.4 874.5 873.3 874.9 870.1 865.9 869.6 873.0 877.7 877.4 879.3 874.1 MAX. QFE PRESSURE IN HPA 886.9 881.3 883.7 878.7 880.5 877.7 871.7 875.0 879.9 886.8 884.4 884.1 886.9 DAY-HOUR 7- 6 12- 6 3- 6 7- 6 26- 6 1- 6 4- 3 25- 6 22- 6 25- 6 16- 6 10- 6 MIN. QFE PRESSURE IN HPA 871.1 866.1 865.0 867.6 869.4 861.5 860.1 863.8 867.8 869.3 868.1 874.5 860.1 DAY-HOUR 11-12 23-12 26-12 16-12 10-15 22-12 16-15 22-15 20-12 12-12 25-15 4- 9 MEAN QNH PRESSURE IN HPA 1020.4 1017.3 1016.3 1015.0 1016.7 1011.3 1006.6 1010.7 1014.6 1019.9 1019.5 1021.6 1015.8 MAX. QNH PRESSURE IN HPA 1030.3 1024.0 1026.7 1021.0 1023.1 1019.9 1013.1 1016.8 1022.4 1030.2 1027.5 1027.1 1030.3 DAY-HOUR 7- 6 12- 6 3- 6 7- 6 26- 6 1- 6 4- 3 25- 6 22- 6 25- 6 16- 6 10- 6 MIN. QNH PRESSURE IN HPA 1012.4 1006.8 1005.5 1008.5 1010.5 1001.6 1000.0 1004.2 1008.7 1010.4 1009.0 1016.3 1000.0 DAY-HOUR 11-12 23-12 26-12 16-12 10-15 22-12 16-15 22-15 20-12 12-12 25-15 4- 9 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 878.4 875.7 874.9 874.0 875.6 871.3 866.8 870.3 873.8 878.2 877.8 879.4 874.7 MAX. QFE PRESSURE IN HPA 885.6 880.3 882.4 877.6 879.5 876.7 871.7 874.2 879.6 885.7 884.0 883.4 885.7 DAY 7 14 3 13 26 1 4 25 22 27 16 11 MIN. QFE PRESSURE IN HPA 872.6 867.3 867.2 870.3 872.1 865.4 862.3 866.5 869.7 873.1 872.6 875.1 862.3 DAY 12 5 26 17 11 22 17 23 20 12 26 4 MEAN QNH PRESSURE IN HPA 1020.7 1017.6 1016.7 1015.7 1017.5 1012.7 1007.6 1011.5 1015.5 1020.4 1020.0 1021.9 1016.5 MAX. QNH PRESSURE IN HPA 1028.8 1022.8 1025.2 1019.8 1021.9 1018.8 1013.1 1015.9 1022.0 1028.9 1027.0 1026.3 1028.9 DAY 7 14 3 13 26 1 4 25 22 27 16 11 MIN. QNH PRESSURE IN HPA 1014.1 1008.1 1008.0 1011.5 1013.6 1006.0 1002.5 1007.2 1010.9 1014.7 1014.1 1017.0 1002.5 DAY 12 5 26 17 11 22 17 23 20 12 26 4 MEAN QFF PRESSURE IN HPA 1021.0 1017.1 1014.0 1010.2 1009.4 1001.8 994.3 998.7 1005.8 1014.8 1017.2 1023.8 1010.7 MAX. QFF PRESSURE IN HPA 1029.8 1022.9 1024.1 1016.5 1015.2 1013.2 1000.6 1004.0 1017.1 1026.0 1027.2 1028.8 1029.8 DAY 7 14 3 7 29 1 4 25 22 27 28 11 MIN. QFF PRESSURE IN HPA 1010.2 1003.7 1001.0 1004.4 1004.2 992.2 987.9 994.3 1000.1 1006.7 1008.8 1016.9 987.9 DAY 17 5 26 19 7 22 17 8 19 5 11 4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 879.5 876.6 876.0 874.8 876.3 871.7 867.4 871.1 874.7 879.3 878.7 880.4 875.5 MAX. QFE PRESSURE IN HPA 886.9 881.3 883.7 878.7 880.5 877.7 871.5 875.0 879.9 886.8 884.4 884.1 886.9 DAY 7 12 3 7 26 1 4 25 22 25 16 10 MIN. QFE PRESSURE IN HPA 873.8 866.3 867.3 870.7 873.0 865.1 863.3 867.7 870.7 873.4 873.3 875.2 863.3 DAY 12 5 26 19 11 22 16 3 20 12 24 4 MEAN QNH PRESSURE IN HPA 1022.0 1018.7 1018.0 1016.6 1018.3 1013.2 1008.3 1012.4 1016.5 1021.7 1021.0 1022.9 1017.4 MAX. QNH PRESSURE IN HPA 1030.3 1024.0 1026.7 1021.0 1023.1 1019.9 1012.9 1016.8 1022.4 1030.2 1027.5 1027.1 1030.3 DAY 7 12 3 7 26 1 4 25 22 25 16 10 MIN. QNH PRESSURE IN HPA 1015.5 1007.0 1008.1 1012.0 1014.6 1005.7 1003.6 1008.6 1012.0 1015.0 1014.9 1017.1 1003.6 DAY 12 5 26 19 11 22 16 3 20 12 24 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 878.2 875.8 875.1 873.8 875.2 870.5 866.5 870.2 873.4 878.0 877.5 879.3 874.5 MAX. QFE PRESSURE IN HPA 885.6 880.5 882.8 877.7 879.7 876.6 870.4 873.8 878.4 885.7 883.1 883.4 885.7 DAY 7 12 3 13 26 1 4 25 22 25 16 10 MIN. QFE PRESSURE IN HPA 872.4 867.1 867.4 869.6 871.7 863.9 862.6 867.2 869.3 871.9 871.5 874.5 862.6 DAY 11 5 26 16 7 22 16 8 20 12 25 4 MEAN QNH PRESSURE IN HPA 1020.5 1017.8 1017.0 1015.5 1017.1 1011.8 1007.3 1011.4 1015.0 1020.3 1019.6 1021.7 1016.2 MAX. QNH PRESSURE IN HPA 1028.8 1023.1 1025.7 1019.9 1022.2 1018.7 1011.6 1015.5 1020.7 1028.9 1026.0 1026.3 1028.9 DAY 7 12 3 13 26 1 4 25 22 25 16 10 MIN. QNH PRESSURE IN HPA 1013.9 1007.9 1008.3 1010.7 1013.1 1004.3 1002.8 1008.0 1010.4 1013.3 1012.9 1016.3 1002.8 DAY 11 5 26 16 7 22 16 8 20 12 25 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 877.1 874.2 873.3 872.0 873.8 868.7 864.8 868.4 871.7 876.4 876.2 878.3 872.9 MAX. QFE PRESSURE IN HPA 884.6 878.9 880.9 876.5 878.3 875.0 868.8 871.7 876.2 884.6 882.4 882.6 884.6 DAY 7 1 3 13 29 1 31 24 13 25 15 10 MIN. QFE PRESSURE IN HPA 871.1 866.1 865.0 867.6 869.7 861.5 861.0 864.8 867.8 869.3 868.3 874.7 861.0 DAY 11 23 26 16 10 22 10 22 20 12 25 4 MEAN QNH PRESSURE IN HPA 1019.2 1015.9 1014.9 1013.4 1015.5 1009.8 1005.3 1009.4 1013.1 1018.5 1018.1 1020.5 1014.5 MAX. QNH PRESSURE IN HPA 1027.7 1021.3 1023.5 1018.5 1020.6 1016.8 1009.8 1013.1 1018.2 1027.7 1025.2 1025.4 1027.7 DAY 7 1 3 13 29 1 31 24 13 25 15 10 MIN. QNH PRESSURE IN HPA 1012.4 1006.8 1005.5 1008.5 1010.9 1001.6 1001.0 1005.3 1008.7 1010.4 1009.3 1016.5 1001.0 DAY 11 23 26 16 10 22 10 22 20 12 25 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 ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1995 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 877.7 874.8 873.5 872.2 873.6 868.2 864.2 868.1 871.8 876.7 876.9 879.0 873.1 MAX. QFE PRESSURE IN HPA 884.7 879.6 880.6 876.7 878.5 874.7 868.8 871.4 876.2 884.9 882.9 883.1 884.9 DAY 7 1 3 12 26 1 31 24 13 25 15 10 MIN. QFE PRESSURE IN HPA 872.4 868.4 865.5 867.9 869.4 861.6 860.1 863.8 868.3 871.0 868.1 876.0 860.1 DAY 11 5 26 17 10 22 16 22 19 12 25 4 MEAN QNH PRESSURE IN HPA 1019.9 1016.6 1015.2 1013.7 1015.3 1009.2 1004.7 1009.0 1013.2 1018.8 1019.0 1021.3 1014.6 MAX. QNH PRESSURE IN HPA 1027.8 1022.0 1023.2 1018.8 1020.8 1016.5 1009.8 1012.8 1018.2 1028.0 1025.8 1026.0 1028.0 DAY 7 1 3 12 26 1 31 24 13 25 15 10 MIN. QNH PRESSURE IN HPA 1013.9 1009.4 1006.1 1008.8 1010.5 1001.7 1000.0 1004.2 1009.3 1012.3 1009.0 1018.0 1000.0 DAY 11 5 26 17 10 22 16 22 19 12 25 4 MEAN QFF PRESSURE IN HPA 1020.0 1016.1 1012.4 1008.1 1007.2 998.1 991.4 996.1 1003.5 1013.2 1016.2 1023.2 1008.8 MAX. QFF PRESSURE IN HPA 1028.9 1021.4 1022.0 1013.4 1015.2 1009.3 997.0 1000.8 1011.3 1024.4 1026.5 1028.3 1028.9 DAY 7 13 3 12 29 1 31 24 22 25 27 19 MIN. QFF PRESSURE IN HPA 1012.4 1005.6 1000.3 1003.4 1002.3 988.0 985.2 990.4 998.6 1003.7 1005.4 1019.2 985.2 DAY 12 5 26 17 6 22 16 22 18 4 11 4 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 2.7 8.5 9.9 18.4 25.3 30.7 31.4 32.3 30.1 20.7 12.1 9.8 19.3 MINIMUN AIR TEMPERATURE (C) -1.7 3.5 5.0 11.5 17.7 22.4 23.9 24.2 21.8 13.1 6.1 3.8 12.6 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 7 21 30 28 22 0 0 0 108 DAYS WITH MINIMUM TEMP. <=-4 12 1 0 0 0 0 0 0 0 0 0 0 13 DAYS WITH FREEZING MIN.<= 0 19 3 1 0 0 0 0 0 0 0 0 2 25 TEMPERATURE RECORDS LOWEST(C) -10.6 -5.0 -1.0 3.4 13.4 18.0 20.5 19.8 18.0 9.2 0.8 -0.6 -10.6 DAY 16 6 1 6 2 28 16 4 24 19 13 3 MAXIMUM AIR TEMPERATURE (C) 6.2 12.6 13.5 23.4 29.6 35.4 35.7 36.7 34.6 25.4 15.9 13.7 23.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 12 30 31 31 28 2 0 0 134 DAYS WITH MAXIMUM TEMP. <= 0 6 0 0 0 0 0 0 0 0 0 0 0 6 TEMPERATURE RECORDS HIGHEST(C) 16.6 24.0 23.8 29.8 37.0 40.2 39.0 40.2 38.6 31.4 22.0 21.5 40.2 DAY 6 10 31 22 31 4 7 23 8 14 3 28 DIF. BETWEEN (MAX.-MIN.) (C) 7.9 9.1 8.5 11.9 11.9 13.0 11.8 12.5 12.8 12.3 9.8 9.9 11.0 MEAN DAILY TEMP. (MDT) (C) 2.2 8.0 9.2 17.4 23.7 28.9 29.8 30.4 28.2 19.3 11.0 8.7 18.1 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 8.6 91.4 237.1 272.4 292.7 216.7 10.3 0.0 0.0 1129.3 HEATING DEG. DAYS(BASE 18 0C) 488.5 290.1 271.5 56.2 0.0 0.0 0.0 0.0 0.0 16.9 210.1 287.6 1620.9 DEWPOINT (MEAN C) -5.4 0.3 0.1 0.5 6.8 5.2 6.8 2.6 0.4 -1.4 -2.5 -3.4 0.8 MIXING RATIO (G/KG) 3.06 4.57 4.61 4.85 7.26 6.79 7.48 5.59 4.71 4.18 3.67 3.57 5.03 VAPOUR PRESSURE (HPA) 4.30 6.37 6.42 6.76 10.08 9.39 10.34 7.75 6.55 5.85 5.16 5.01 7.00 SATURATION DEF. (HPA) 3.68 5.35 6.37 15.61 23.48 36.38 36.77 41.91 37.65 19.39 9.59 7.53 20.31 RELATIVE HUMIDITY (MEAN %) 59 60 57 34 33 23 23 17 16 25 37 42 36 RELATIVE HUMIDITY (MAX. %) 70 75 76 53 50 33 35 26 23 36 49 58 49 RELATIVE HUMIDITY (MIN. %) 49 47 44 23 24 16 16 12 12 18 31 32 27 RELATIVE HUMIDITY (MEAN% 03UTC) 66 69 73 51 49 32 35 26 22 34 46 54 46 RELATIVE HUMIDITY (MEAN% 09UTC) 57 56 51 29 28 20 20 15 14 23 33 34 32 RELATIVE HUMIDITY (MEAN% 15UTC) 59 60 55 32 31 19 18 13 14 23 38 42 34 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 22.1 84.2 60.5 16.1 6.3 6.0 0.0 0.0 0.0 2.0 0.0 7.0 204.2 DAYS WITH PRECIPITATION >=10 1 2 2 0 0 0 0 0 0 0 0 0 5 DAYS WITH PRECIPITATION >= 5 1 4 3 1 0 0 0 0 0 0 0 1 10 DAYS WITH PRECIPITATION >= 1 3 6 7 3 1 3 0 0 0 1 0 2 26 DAYS WITH PRECIPITATION 3 7 9 7 7 4 0 0 0 2 2 2 43 GREATEST DAILY PRECIPITATION 16.0 51.0 27.0 9.0 4.0 3.0 0.0 0.0 0.0 2.0 0.0 6.0 51.0 DAY 13 22 4 4 8 28 ** ** ** 10 ** 15 DAY WITH THUNDER STORM 0 0 0 0 5 0 0 0 0 0 0 0 5 DAYS WITH SNOW OR SLEET 3 3 0 0 0 0 0 0 0 0 0 0 6 DAYS WITH DUST 1 0 2 6 4 6 3 2 6 2 0 0 32 WIND DIRECTION (PREVAILING) 180 180 315 360 360 45 45 45 180 180 180 180 45 PREVAILING WIND SPEED(KNOTS) 11.4 13.6 8.6 7.1 7.9 13.6 12.1 13.1 12.3 10.0 10.5 13.0 10.8 PREVAILING WIND PERCENT 20.0 19.3 11.6 22.7 18.1 40.0 43.2 29.7 16.0 14.8 13.3 16.8 16.7 CALMS PERCENT OF WIND 64.5 55.2 45.8 22.0 38.1 12.7 19.4 23.2 35.3 54.8 55.3 54.8 40.1 NO. OF WIND OBSERVATION 155 145 155 150 155 150 155 155 150 155 150 155 1830 VECTOR WIND DIRECTION (MEAN) 174 198 285 299 46 55 58 53 85 162 213 168 71 VECTOR WIND MAGNITUDE(KNOTS) 1.8 2.4 0.9 1.3 1.2 5.7 6.9 5.7 0.7 1.1 0.6 1.7 1.3 WIND STEADINESES (MEAN %) 54.5 46.2 16.7 15.9 19.7 53.3 73.4 64.0 11.3 23.4 17.1 41.5 20.6 WIND SPEED (MEAN KNOTS) 3.3 5.2 5.4 8.2 6.1 10.7 9.4 8.9 6.2 4.7 3.5 4.1 6.3 FASTEST WIND DIRECTION 180 240 230 210 210 60 70 60 180 70 180 180 210 FASTEST WIND SPEED (KNOTS) 27 29 31 39 39 29 25 23 19 37 16 23 39 DAY 6 9 26 13 7 23 6 10 2 1 3 25 DAYS WITH SKY CLEAR (0-2)/8 14 12 9 14 13 24 24 24 29 29 19 16 227 DAYS WITH P.CLOUDY (3-6)/8 10 7 9 11 15 6 7 7 1 2 8 14 97 DAYS WITH CLOUDY (7-8)/8 7 10 13 5 3 0 0 0 0 0 3 1 42 DAYS WITH VISIBILITY =< 2 KM 1 2 1 0 0 0 0 0 5 0 0 0 9 DURATION OF SUNSHINE HOURS 183.0 158.2 184.4 273.0 299.4 367.4 369.3 349.9 301.4 295.2 208.1 222.8 3212.1 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 878.3 874.4 872.8 874.3 874.0 870.3 871.5 871.5 872.0 877.4 881.0 879.6 874.8 MAX. QFE PRESSURE IN HPA 885.6 881.4 878.3 880.4 878.6 876.0 877.2 879.8 880.6 886.3 890.9 886.1 890.9 DAY-HOUR 26- 6 13- 6 29- 6 5- 6 7-15 12- 6 4- 3 29- 6 25- 6 2- 6 18- 6 8- 6 MIN. QFE PRESSURE IN HPA 869.3 865.2 866.6 866.7 866.0 862.3 863.4 864.6 865.5 868.6 875.0 873.8 862.3 DAY-HOUR 6-12 5- 3 13- 3 18-12 29-15 19-12 7-15 8-15 21-15 27-12 29-12 25-12 MEAN QNH PRESSURE IN HPA 1020.6 1016.2 1014.3 1016.1 1015.7 1011.5 1012.9 1012.9 1013.4 1019.6 1023.6 1022.0 1016.6 MAX. QNH PRESSURE IN HPA 1028.8 1024.1 1020.6 1022.9 1020.9 1018.0 1019.3 1022.3 1023.2 1029.6 1034.8 1029.4 1034.8 DAY-HOUR 26- 6 13- 6 29- 6 5- 6 7-15 12- 6 4- 3 29- 6 25- 6 2- 6 18- 6 8- 6 MIN. QNH PRESSURE IN HPA 1010.4 1005.8 1007.4 1007.5 1006.7 1002.5 1003.7 1005.1 1006.1 1009.6 1016.8 1015.5 1002.5 DAY-HOUR 6-12 5- 3 13- 3 18-12 29-15 19-12 7-15 8-15 21-15 27-12 29-12 25-12 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 878.3 874.3 873.0 874.9 874.9 871.5 872.4 872.2 872.8 877.9 881.2 879.9 875.3 MAX. QFE PRESSURE IN HPA 884.4 880.4 878.2 879.6 877.8 875.5 877.2 879.5 879.4 885.0 889.8 885.4 889.8 DAY 26 24 29 5 5 12 4 30 25 2 19 8 MIN. QFE PRESSURE IN HPA 872.9 865.2 866.6 867.8 871.0 867.1 866.0 867.0 867.8 870.3 875.6 873.9 865.2 DAY 19 5 13 10 29 19 7 8 20 27 29 25 MEAN QNH PRESSURE IN HPA 1020.6 1016.0 1014.6 1016.7 1016.8 1012.9 1014.0 1013.7 1014.4 1020.1 1023.9 1022.3 1017.2 MAX. QNH PRESSURE IN HPA 1027.5 1022.9 1020.5 1022.0 1020.0 1017.4 1019.3 1021.9 1021.8 1028.1 1033.6 1028.6 1033.6 DAY 26 24 29 5 5 12 4 30 25 2 19 8 MIN. QNH PRESSURE IN HPA 1014.5 1005.8 1007.4 1008.7 1012.3 1007.9 1006.7 1007.8 1008.7 1011.5 1017.5 1015.6 1005.8 DAY 19 5 13 10 29 19 7 8 20 27 29 25 MEAN QFF PRESSURE IN HPA 1023.9 1015.6 1013.7 1011.6 1008.3 1001.6 1002.2 1001.9 1003.8 1014.2 1022.4 1022.1 1011.8 MAX. QFF PRESSURE IN HPA 1031.9 1024.2 1019.1 1022.7 1015.0 1009.0 1007.2 1012.0 1013.2 1022.8 1034.8 1030.5 1034.8 DAY 14 24 29 5 8 28 4 30 25 19 19 4 MIN. QFF PRESSURE IN HPA 1014.8 1001.6 1005.0 1002.3 1001.2 996.1 993.9 995.6 999.1 1003.7 1012.9 1013.7 993.9 DAY 6 11 26 13 30 6 7 8 20 27 3 25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 879.3 875.6 873.8 875.7 875.3 871.9 872.9 873.0 873.6 879.0 882.3 880.8 876.1 MAX. QFE PRESSURE IN HPA 885.6 881.4 878.3 880.4 878.4 876.0 877.1 879.8 880.6 886.3 890.9 886.1 890.9 DAY 26 13 29 5 17 12 4 29 25 2 18 8 MIN. QFE PRESSURE IN HPA 873.7 865.4 867.1 869.7 871.0 866.8 865.9 867.3 868.5 871.7 876.4 875.0 865.4 DAY 19 5 13 10 29 19 7 8 20 27 29 25 MEAN QNH PRESSURE IN HPA 1021.7 1017.5 1015.4 1017.6 1017.2 1013.4 1014.5 1014.6 1015.3 1021.3 1025.0 1023.4 1018.1 MAX. QNH PRESSURE IN HPA 1028.8 1024.1 1020.6 1022.9 1020.7 1018.0 1019.2 1022.3 1023.2 1029.6 1034.8 1029.4 1034.8 DAY 26 13 29 5 17 12 4 29 25 2 18 8 MIN. QNH PRESSURE IN HPA 1015.4 1006.0 1007.9 1010.9 1012.3 1007.6 1006.6 1008.1 1009.5 1013.1 1018.4 1016.8 1006.0 DAY 19 5 13 10 29 19 7 8 20 27 29 25 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 878.4 874.8 873.1 874.6 874.4 870.7 872.0 871.9 872.5 877.7 881.1 879.7 875.1 MAX. QFE PRESSURE IN HPA 884.4 880.6 877.2 879.9 877.7 874.8 876.1 878.4 879.7 883.9 890.1 885.2 890.1 DAY 26 13 29 4 17 12 4 29 25 2 18 8 MIN. QFE PRESSURE IN HPA 872.6 865.5 867.6 868.6 869.0 864.9 864.7 866.3 867.6 870.2 875.6 874.8 864.7 DAY 6 5 13 18 29 19 7 8 20 27 29 25 MEAN QNH PRESSURE IN HPA 1020.7 1016.7 1014.7 1016.4 1016.1 1012.0 1013.4 1013.3 1014.0 1019.9 1023.7 1022.2 1016.9 MAX. QNH PRESSURE IN HPA 1027.5 1023.2 1019.3 1022.4 1019.9 1016.6 1018.1 1020.7 1022.2 1026.9 1033.9 1028.4 1033.9 DAY 26 13 29 4 17 12 4 29 25 2 18 8 MIN. QNH PRESSURE IN HPA 1014.1 1006.1 1008.5 1009.6 1010.1 1005.4 1005.2 1007.0 1008.5 1011.4 1017.5 1016.6 1005.2 DAY 6 5 13 18 29 19 7 8 20 27 29 25 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 877.5 873.5 871.8 873.2 872.7 868.8 870.4 870.3 870.7 876.2 880.0 878.5 873.6 MAX. QFE PRESSURE IN HPA 883.2 879.2 875.3 878.7 875.6 871.7 874.9 876.8 878.4 882.4 889.0 883.9 889.0 DAY 26 13 29 4 7 27 3 29 25 2 18 3 MIN. QFE PRESSURE IN HPA 869.3 865.5 867.6 866.7 867.0 862.3 863.6 864.8 865.8 868.6 875.0 873.8 862.3 DAY 6 5 13 18 29 19 7 8 20 27 29 25 MEAN QNH PRESSURE IN HPA 1019.7 1015.2 1013.3 1014.8 1014.2 1009.9 1011.7 1011.6 1011.9 1018.2 1022.5 1020.8 1015.3 MAX. QNH PRESSURE IN HPA 1026.1 1021.6 1017.2 1021.0 1017.5 1013.1 1016.7 1018.9 1020.7 1025.2 1032.7 1026.9 1032.7 DAY 26 13 29 4 7 27 3 29 25 2 18 3 MIN. QNH PRESSURE IN HPA 1010.4 1006.1 1008.5 1007.5 1007.8 1002.5 1004.0 1005.3 1006.5 1009.6 1016.8 1015.5 1002.5 DAY 6 5 13 18 29 19 7 8 20 27 29 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 ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1996 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 878.0 874.1 872.1 873.2 872.9 868.5 870.0 870.0 870.5 876.5 880.5 879.0 873.8 MAX. QFE PRESSURE IN HPA 883.5 879.1 875.8 878.9 878.6 875.0 874.7 876.2 878.3 882.7 888.8 884.6 888.8 DAY 10 23 28 4 7 27 3 29 25 2 18 4 MIN. QFE PRESSURE IN HPA 869.6 866.8 867.6 867.0 866.0 863.3 863.4 864.6 865.5 869.6 875.4 874.4 863.3 DAY 6 5 13 10 29 19 7 8 21 27 6 24 MEAN QNH PRESSURE IN HPA 1020.3 1015.8 1013.6 1014.9 1014.4 1009.5 1011.1 1011.2 1011.7 1018.5 1023.0 1021.4 1015.5 MAX. QNH PRESSURE IN HPA 1026.4 1021.5 1017.7 1021.3 1020.9 1016.8 1016.5 1018.2 1020.6 1025.5 1032.4 1027.7 1032.4 DAY 10 23 28 4 7 27 3 29 25 2 18 4 MIN. QNH PRESSURE IN HPA 1010.7 1007.6 1008.5 1007.8 1006.7 1003.6 1003.7 1005.1 1006.1 1010.7 1017.3 1016.2 1003.6 DAY 6 5 13 10 29 19 7 8 21 27 6 24 MEAN QFF PRESSURE IN HPA 1023.5 1015.4 1012.5 1009.7 1005.8 998.2 999.4 999.3 1001.1 1012.6 1021.5 1021.1 1010.0 MAX. QFF PRESSURE IN HPA 1032.4 1023.2 1017.4 1021.4 1015.5 1009.3 1003.3 1008.2 1011.5 1021.7 1033.5 1029.3 1033.5 DAY 14 23 15 4 7 27 3 30 25 19 18 3 MIN. QFF PRESSURE IN HPA 1008.9 1003.2 1004.9 1001.6 995.4 991.6 990.7 992.4 995.9 1002.5 1013.4 1012.3 990.7 DAY 6 10 25 12 29 19 7 8 8 27 3 29 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 ARDESTAN (40799) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 33 23 N LONGITUDE 52 23 E DATA PROCESSING CENTER ELEVATION 1252.4 M MEANS AND EXTREMES FOR THE YEAR 1997 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 8.4 7.4 10.7 19.6 24.8 30.6 35.1 33.9 27.9 23.5 12.5 7.8 20.2 MINIMUN AIR TEMPERATURE (C) 2.6 -0.3 4.4 12.3 17.3 23.5 27.4 25.2 19.9 16.6 7.4 3.0 13.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 6 28 31 31 11 3 0 0 110 DAYS WITH MINIMUM TEMP. <=-4 2 8 1 0 0 0 0 0 0 0 0 0 11 DAYS WITH FREEZING MIN.<= 0 6 15 4 0 0 0 0 0 0 0 0 2 27 TEMPERATURE RECORDS LOWEST(C) -6.4 -8.4 -4.0 1.2 9.4 19.0 22.0 21.0 14.0 11.2 3.8 -2.9 -8.4 DAY 29 7 9 12 6 20 1 29 15 25 28 30 MAXIMUM AIR TEMPERATURE (C) 12.3 12.2 15.2 24.2 29.5 35.2 40.0 38.8 32.6 27.6 16.3 11.3 24.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 3 13 29 31 31 24 7 0 0 138 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 18.5 22.2 21.2 31.0 35.2 40.6 43.4 43.2 38.8 34.0 24.6 18.2 43.4 DAY 10 22 23 27 28 16 18 15 2 3 5 10 DIF. BETWEEN (MAX.-MIN.) (C) 9.7 12.5 10.8 11.9 12.2 11.7 12.6 13.6 12.7 11.0 8.9 8.3 11.3 MEAN DAILY TEMP. (MDT) (C) 7.4 6.0 9.8 18.3 23.4 29.3 33.7 32.0 26.3 22.1 11.8 7.2 18.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 12.5 88.9 249.8 393.8 341.2 159.1 57.2 0.0 0.0 1302.7 HEATING DEG. DAYS(BASE 18 0C) 328.1 337.3 253.8 42.2 3.0 0.0 0.0 0.0 0.0 1.1 187.7 335.0 1488.3 DEWPOINT (MEAN C) -6.3 -12.1 -4.9 -3.9 3.3 8.4 7.0 5.8 -0.7 0.2 -0.3 -0.4 -0.3 MIXING RATIO (G/KG) 2.79 1.94 3.29 3.57 5.92 8.48 7.65 7.31 4.33 4.59 4.42 4.30 4.88 VAPOUR PRESSURE (HPA) 3.91 2.73 4.58 4.97 8.23 11.69 10.52 10.07 6.04 6.42 6.20 6.02 6.78 SATURATION DEF. (HPA) 7.52 8.31 8.88 18.88 24.39 33.34 47.51 44.38 32.91 23.59 8.74 4.83 21.94 RELATIVE HUMIDITY (MEAN %) 37 26 39 23 27 28 19 19 17 24 44 59 30 RELATIVE HUMIDITY (MAX. %) 51 38 56 36 39 37 27 26 24 32 58 72 41 RELATIVE HUMIDITY (MIN. %) 28 18 28 14 20 22 14 14 12 19 35 47 23 RELATIVE HUMIDITY (MEAN% 03UTC) 49 36 53 34 38 36 26 25 23 32 57 65 40 RELATIVE HUMIDITY (MEAN% 09UTC) 32 23 35 19 24 25 17 18 15 21 40 56 27 RELATIVE HUMIDITY (MEAN% 15UTC) 37 23 33 20 24 25 15 16 14 22 42 60 28 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 1.5 0.0 33.8 4.4 8.8 0.9 0.0 0.0 0.0 3.5 1.5 18.1 72.5 DAYS WITH PRECIPITATION >=10 0 0 1 0 0 0 0 0 0 0 0 1 2 DAYS WITH PRECIPITATION >= 5 0 0 3 0 0 0 0 0 0 0 0 1 4 DAYS WITH PRECIPITATION >= 1 1 0 5 3 4 0 0 0 0 1 1 2 17 DAYS WITH PRECIPITATION 3 0 10 5 9 5 0 0 0 2 2 7 43 GREATEST DAILY PRECIPITATION 1.0 0.0 17.0 2.0 3.0 0.6 0.0 0.0 0.0 3.1 1.0 15.0 17.0 DAY 17 ** 16 4 19