STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1955 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. 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(MDT) (C) ***** ***** 7.7 13.1 16.6 22.3 27.5 27.6 22.2 14.8 10.2 4.0 ***** COOLING DEG. DAYS(BASE 21 0C)****** ****** 0.0 0.0 0.5 55.0 201.5 203.5 48.5 0.0 0.0 0.0 ****** HEATING DEG. DAYS(BASE 18 0C)****** ****** 319.0 146.5 69.0 1.0 0.0 0.0 2.0 101.0 235.0 434.5 ****** DEWPOINT (MEAN C) ***** ***** 0.0 2.9 5.2 7.5 8.9 8.1 3.8 2.0 0.2 -2.0 ***** MIXING RATIO (G/KG) ****** ****** 4.76 5.87 6.90 8.07 9.21 8.60 6.23 5.45 4.80 4.09 ****** VAPOUR PRESSURE (HPA) ****** ****** 6.25 7.71 9.05 10.54 11.95 11.19 8.17 7.18 6.33 5.38 ****** SATURATION DEF. (HPA) ****** ****** 4.18 8.06 10.52 18.27 25.92 25.60 19.43 8.92 5.74 2.58 ****** RELATIVE HUMIDITY (MEAN %) *** *** 66 53 52 41 35 33 35 49 55 70 *** RELATIVE HUMIDITY (MAX. %) *** *** 84 75 76 59 47 47 54 66 72 84 *** RELATIVE HUMIDITY (MIN. %) *** *** 47 34 31 25 22 21 20 32 38 52 *** RELATIVE HUMIDITY (MEAN% 03UTC) *** *** 75 68 67 53 45 42 46 58 67 80 *** RELATIVE HUMIDITY (MEAN% 09UTC) *** *** 55 41 38 30 27 25 23 37 42 61 *** RELATIVE HUMIDITY (MEAN% 15UTC) *** *** 60 45 41 34 27 27 26 48 51 66 *** RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. ****** ****** 84.0 59.0 10.0 14.0 0.0 0.0 0.0 24.4 25.6 28.0 ****** DAYS WITH PRECIPITATION >=10 **** **** 3 1 0 1 0 0 0 1 1 1 **** DAYS WITH PRECIPITATION >= 5 **** **** 6 2 1 1 0 0 0 2 2 2 **** DAYS WITH PRECIPITATION >= 1 **** **** 8 3 2 1 0 0 0 2 2 5 **** DAYS WITH PRECIPITATION **** **** 8 3 2 1 0 0 0 3 2 5 **** GREATEST DAILY PRECIPITATION ****** ****** 35.0 48.0 6.0 14.0 0.0 0.0 0.0 18.0 20.0 13.0 ****** DAY ** ** 7 28 3 3 ** ** ** 11 24 4 DAY WITH THUNDER STORM **** **** 0 0 0 0 0 0 0 0 0 0 **** DAYS WITH SNOW OR SLEET **** **** 1 0 0 0 0 0 0 0 0 2 **** DAYS WITH DUST **** **** 0 0 0 0 0 0 0 0 0 2 **** WIND DIRECTION (PREVAILING) *** *** 270 270 270 270 270 270 270 270 225 270 *** PREVAILING WIND SPEED(KNOTS) **** **** 5.3 6.8 7.2 6.9 7.2 6.2 6.3 4.8 9.7 7.0 **** PREVAILING WIND PERCENT ***** ***** 40.3 57.7 40.3 24.3 23.4 16.9 27.9 21.8 23.3 20.6 ***** CALMS PERCENT OF WIND ***** ***** 16.5 2.9 22.6 25.5 20.2 40.3 37.1 44.8 32.9 37.2 ***** NO. OF WIND OBSERVATION **** **** 248 239 248 239 248 248 240 248 240 247 2445 VECTOR WIND DIRECTION (MEAN) *** *** 262 262 257 257 251 253 248 250 235 232 *** VECTOR WIND MAGNITUDE(KNOTS) **** **** 3.5 4.5 3.4 2.3 2.3 0.7 1.5 0.6 3.0 1.8 **** WIND STEADINESES (MEAN %) ***** ***** 67.3 68.2 59.6 39.0 39.0 18.9 38.5 24.0 62.5 40.9 ***** WIND SPEED (MEAN KNOTS) **** **** 5.2 6.6 5.7 5.9 5.9 3.7 3.9 2.5 4.8 4.4 **** FASTEST WIND DIRECTION *** *** 230 230 270 270 180 230 270 310 230 80 *** FASTEST WIND SPEED (KNOTS) *** *** 22 19 18 23 17 17 13 21 22 30 *** DAY ** ** 4 10 26 9 12 12 17 7 22 8 DAYS WITH SKY CLEAR (0-2)/8 **** **** 9 9 10 26 31 22 30 25 11 13 **** DAYS WITH P.CLOUDY (3-6)/8 **** **** 10 17 15 2 0 8 0 5 12 6 **** DAYS WITH CLOUDY (7-8)/8 **** **** 12 4 6 2 0 1 0 1 7 12 **** DAYS WITH VISIBILITY =< 2 KM **** **** 0 0 0 1 1 0 0 0 0 2 **** DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1955 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA ****** ****** 822.1 825.0 824.9 822.7 819.8 821.5 824.3 828.0 826.9 824.1 ****** MAX. QFE PRESSURE IN HPA ****** ****** 828.2 831.5 830.0 827.0 825.5 826.6 831.5 833.7 833.4 832.2 ****** DAY-HOUR **-** **-** 22- 6 2- 6 17- 6 1- 6 10- 6 22- 0 21- 6 18- 6 16- 0 2-15 MIN. QFE PRESSURE IN HPA ****** ****** 814.5 815.2 817.0 816.5 815.2 816.0 818.0 823.0 820.7 816.3 ****** DAY-HOUR **-** **-** 12- 9 9-15 2-12 22-15 28-12 6-12 1-12 2-15 24-12 29-12 MEAN QNH PRESSURE IN HPA ****** ****** 1010.4 1013.9 1013.8 1011.2 1007.8 1009.7 1013.1 1017.4 1016.2 1012.8 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1017.7 1021.6 1019.8 1016.3 1014.5 1015.8 1021.6 1024.2 1023.9 1022.4 ****** DAY-HOUR **-** **-** 22- 6 2- 6 17- 6 1- 6 10- 6 22- 0 21- 6 18- 6 16- 0 2-15 MIN. 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QFE PRESSURE IN HPA ****** ****** 816.0 815.6 820.0 818.0 816.8 817.0 820.0 825.0 823.0 816.7 ****** DAY ** ** 13 10 3 30 29 7 1 6 24 29 MEAN QNH PRESSURE IN HPA ****** ****** 1010.8 1014.5 1014.1 1011.5 1008.1 1010.3 1013.4 1017.7 1016.5 1013.0 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1015.7 1018.7 1018.9 1015.8 1012.7 1015.8 1019.1 1023.1 1023.9 1019.8 ****** DAY ** ** 1 2 17 2 10 22 22 19 16 3 MIN. QNH PRESSURE IN HPA ****** ****** 1003.3 1002.8 1008.0 1005.6 1004.2 1004.5 1008.0 1013.9 1011.6 1004.1 ****** DAY ** ** 13 10 3 30 29 7 1 6 24 29 MEAN QFF PRESSURE IN HPA ****** ****** 1007.6 1007.6 1004.9 998.2 991.4 993.9 1000.3 1009.8 1011.7 1012.3 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1012.9 1014.3 1013.5 1003.9 997.2 1001.5 1006.9 1016.7 1020.0 1019.0 ****** DAY ** ** 22 13 9 2 10 22 22 14 16 21 MIN. QFF PRESSURE IN HPA ****** ****** 997.5 996.9 999.1 989.5 987.0 987.0 993.2 1002.8 1006.3 1002.4 ****** DAY ** ** 4 10 22 30 29 7 1 7 24 4 PRESSURE AT HOUR 0300 UTC. 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QFE PRESSURE IN HPA ****** ****** 815.5 815.5 820.0 817.9 816.0 816.6 820.8 824.0 822.0 816.7 ****** DAY ** ** 12 9 1 22 28 6 2 5 22 28 MEAN QNH PRESSURE IN HPA ****** ****** 1010.8 1014.2 1014.1 1011.2 1007.5 1009.6 1013.0 1017.4 1016.3 1012.8 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1017.5 1018.7 1019.1 1015.5 1013.2 1014.9 1017.8 1022.4 1022.2 1021.3 ****** DAY ** ** 31 1 18 1 9 22 21 18 16 2 MIN. QNH PRESSURE IN HPA ****** ****** 1002.7 1002.7 1008.0 1005.5 1003.3 1004.0 1009.0 1012.7 1010.4 1004.1 ****** DAY ** ** 12 9 1 22 28 6 2 5 22 28 MEAN QFF PRESSURE IN HPA ****** ****** 1007.3 1006.1 1004.1 997.1 990.2 992.5 999.1 1009.2 1010.9 1012.0 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1012.3 1012.5 1011.9 1003.3 996.7 999.9 1004.7 1016.6 1018.4 1019.0 ****** DAY ** ** 21 12 8 1 9 21 30 12 16 2 MIN. QFF PRESSURE IN HPA ****** ****** 997.0 994.9 997.9 989.1 985.6 986.4 993.5 1002.6 1004.2 1002.1 ****** DAY ** ** 3 9 21 30 26 6 2 1 22 28 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1956 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -4.8 4.6 7.0 13.8 19.8 25.3 28.8 26.0 21.3 14.9 10.9 ***** ***** MINIMUN AIR TEMPERATURE (C) -8.9 -1.1 0.2 6.5 10.6 15.4 19.6 16.6 11.9 6.4 4.2 -3.7 6.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 1 10 1 0 0 0 0 12 DAYS WITH MINIMUM TEMP. <=-4 23 8 4 2 0 0 0 0 0 0 0 14 51 DAYS WITH FREEZING MIN.<= 0 31 14 16 2 0 0 0 0 0 0 4 24 91 TEMPERATURE RECORDS LOWEST(C) -20.0 -12.0 -7.0 -7.0 5.0 11.0 12.0 13.0 5.0 3.0 -1.0 -14.0 -20.0 DAY 18 1 25 1 2 3 15 31 30 23 15 25 MAXIMUM AIR TEMPERATURE (C) 0.3 9.3 12.2 18.4 28.0 34.9 38.1 34.8 30.3 24.0 16.0 4.9 20.9 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 16 30 31 31 21 0 0 0 129 DAYS WITH MAXIMUM TEMP. <= 0 11 1 0 0 0 0 0 0 0 0 0 8 20 TEMPERATURE RECORDS HIGHEST(C) 8.0 14.0 18.0 25.0 37.0 39.0 43.0 39.0 35.0 28.0 20.0 17.0 43.0 DAY 10 20 7 25 31 23 7 1 1 3 6 5 DIF. BETWEEN (MAX.-MIN.) (C) 9.2 10.4 12.0 11.9 17.4 19.5 18.5 18.2 18.4 17.6 11.8 8.6 14.4 MEAN DAILY TEMP. (MDT) (C) -4.3 4.1 6.2 12.5 19.3 25.1 28.9 25.7 21.1 15.2 10.1 0.6 13.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 17.0 124.5 243.5 147.0 35.5 0.0 0.0 0.0 567.5 HEATING DEG. DAYS(BASE 18 0C) 692.0 402.5 366.5 165.5 27.0 0.0 0.0 0.0 13.0 88.5 237.0 538.5 2530.5 DEWPOINT (MEAN C) -10.0 -0.5 0.8 4.1 2.4 2.7 7.5 5.7 4.1 -0.1 -3.3 ***** ***** MIXING RATIO (G/KG) 2.56 4.78 5.04 6.57 5.68 5.95 8.48 7.17 6.52 4.71 3.72 ****** ****** VAPOUR PRESSURE (HPA) 3.37 6.27 6.59 8.58 7.43 7.78 11.01 9.37 8.55 6.22 4.92 ****** ****** SATURATION DEF. (HPA) 1.36 2.64 3.86 7.87 16.93 26.45 30.61 25.79 18.32 11.76 8.65 ****** ****** RELATIVE HUMIDITY (MEAN %) 69 72 66 56 34 25 29 29 36 38 39 *** *** RELATIVE HUMIDITY (MAX. %) 82 88 81 71 51 41 44 47 53 54 57 *** *** RELATIVE HUMIDITY (MIN. %) 51 57 53 41 21 14 18 18 21 25 28 *** *** RELATIVE HUMIDITY (MEAN% 03UTC) 66 82 75 66 47 36 41 46 47 47 52 *** *** RELATIVE HUMIDITY (MEAN% 09UTC) 68 66 60 51 26 19 24 21 26 30 32 *** *** RELATIVE HUMIDITY (MEAN% 15UTC) 69 74 65 54 28 22 27 25 29 35 37 *** *** RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 135.4 96.5 90.0 35.0 0.0 0.0 15.0 0.0 0.0 0.0 0.0 30.5 402.4 DAYS WITH PRECIPITATION >=10 3 4 4 1 0 0 1 0 0 0 0 1 14 DAYS WITH PRECIPITATION >= 5 3 7 8 3 0 0 1 0 0 0 0 2 24 DAYS WITH PRECIPITATION >= 1 4 8 11 5 0 0 2 0 0 0 0 5 35 DAYS WITH PRECIPITATION 6 9 11 5 0 0 2 0 0 0 0 6 39 GREATEST DAILY PRECIPITATION 61.0 27.0 24.0 18.0 0.0 0.0 14.0 0.0 0.0 0.0 0.0 16.0 61.0 DAY 15 29 30 13 ** ** 22 ** ** ** ** 22 DAY WITH THUNDER STORM 0 0 0 1 0 0 0 0 0 0 0 0 1 DAYS WITH SNOW OR SLEET 6 1 1 0 0 0 0 0 0 0 0 5 13 DAYS WITH DUST 1 0 0 2 1 0 0 2 3 0 0 0 9 WIND DIRECTION (PREVAILING) 270 270 270 270 180 180 180 180 180 270 180 180 270 PREVAILING WIND SPEED(KNOTS) 6.7 7.1 6.9 8.4 9.4 8.5 7.6 9.1 8.8 8.3 9.9 10.1 8.5 PREVAILING WIND PERCENT 23.4 27.8 23.2 38.7 26.1 20.6 20.7 18.5 8.6 1.4 10.6 5.8 14.7 CALMS PERCENT OF WIND 50.8 49.3 37.4 16.7 29.5 34.0 47.9 50.0 79.5 97.7 72.2 84.5 54.5 NO. OF WIND OBSERVATION 248 144 155 150 207 209 217 216 210 217 151 155 2279 VECTOR WIND DIRECTION (MEAN) 248 238 224 248 213 217 211 214 224 250 232 217 226 VECTOR WIND MAGNITUDE(KNOTS) 1.6 2.8 3.7 5.4 4.9 3.5 2.9 3.6 1.6 0.2 2.7 1.1 2.8 WIND STEADINESES (MEAN %) 57.1 70.0 75.5 70.1 71.0 62.5 65.9 76.6 80.0 100.0 87.1 78.6 70.0 WIND SPEED (MEAN KNOTS) 2.8 4.0 4.9 7.7 6.9 5.6 4.4 4.7 2.0 0.2 3.1 1.4 4.0 FASTEST WIND DIRECTION 270 210 230 270 270 180 270 230 220 250 200 220 270 FASTEST WIND SPEED (KNOTS) 15 18 18 25 30 17 18 16 15 12 18 17 30 DAY 30 21 24 14 4 11 2 16 2 9 9 11 DAYS WITH SKY CLEAR (0-2)/8 14 8 8 7 29 25 22 23 24 29 16 8 213 DAYS WITH P.CLOUDY (3-6)/8 13 11 15 13 2 4 9 7 6 2 8 8 98 DAYS WITH CLOUDY (7-8)/8 4 10 8 10 0 1 0 1 0 0 6 13 53 DAYS WITH VISIBILITY =< 2 KM 8 0 0 0 0 0 1 2 3 1 0 7 22 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1956 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 824.2 823.6 820.6 822.2 821.9 822.0 819.5 823.0 824.0 827.8 827.7 826.7 823.6 MAX. QFE PRESSURE IN HPA 832.3 830.0 828.8 829.0 828.1 829.3 825.4 830.4 830.8 832.8 833.5 834.1 834.1 DAY-HOUR 26- 6 13- 6 14- 6 4-15 15- 3 6- 6 24- 6 30- 6 30- 6 26- 6 20- 6 1- 9 MIN. QFE PRESSURE IN HPA 815.5 811.3 811.3 811.2 813.1 814.7 811.7 816.3 815.2 822.7 818.5 818.0 811.2 DAY-HOUR 15- 9 29- 3 29-12 6- 9 30-21 27-12 11-12 15-15 1-15 17-12 8- 9 11- 3 MEAN QNH PRESSURE IN HPA 1013.0 1012.2 1008.8 1010.6 1010.3 1010.4 1007.4 1011.6 1012.7 1017.2 1017.1 1015.9 1012.3 MAX. QNH PRESSURE IN HPA 1022.5 1019.8 1018.4 1018.7 1017.6 1019.0 1014.4 1020.3 1020.8 1023.1 1024.0 1024.7 1024.7 DAY-HOUR 26- 6 13- 6 14- 6 4-15 15- 3 6- 6 24- 6 30- 6 30- 6 26- 6 20- 6 1- 9 MIN. QNH PRESSURE IN HPA 1002.7 997.7 997.7 997.6 999.9 1001.7 998.2 1003.6 1002.3 1011.2 1006.2 1005.6 997.6 DAY-HOUR 15- 9 29- 3 29-12 6- 9 30-21 27-12 11-12 15-15 1-15 17-12 8- 9 11- 3 MEAN QFF PRESSURE IN HPA 1019.5 ****** ****** ****** 999.4 996.1 990.6 996.7 1000.9 1010.0 ****** ****** ****** MAX. QFF PRESSURE IN HPA 1038.2 ****** ****** ****** 1007.4 1005.8 999.2 1008.6 1014.5 1018.6 ****** ****** ****** DAY-HOUR 20- 6 **-** **-** **-** 22-21 6- 6 29- 3 31- 6 30- 3 26- 6 **-** **-** MIN. QFF PRESSURE IN HPA 1003.4 ****** ****** ****** 987.6 985.2 979.9 986.2 989.1 1001.6 ****** ****** ****** DAY-HOUR 31- 3 **-** **-** **-** 30-21 28- 9 11- 9 15- 9 1-15 17- 9 **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 824.5 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 832.0 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 26 ** ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 816.9 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 31 ** ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1013.3 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1022.2 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 26 ** ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1004.3 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 31 ** ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1019.4 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1034.7 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 20 ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1003.8 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 31 ** ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 824.3 823.6 821.0 822.2 822.9 822.9 820.5 824.2 824.8 828.4 827.9 826.8 824.1 MAX. QFE PRESSURE IN HPA 832.0 829.0 828.0 828.7 828.1 827.4 824.4 829.7 830.2 832.0 831.8 832.7 832.7 DAY 26 13 14 15 15 6 25 31 30 26 13 3 MIN. QFE PRESSURE IN HPA 816.2 811.3 816.0 813.2 818.6 817.0 814.5 819.5 820.3 824.0 819.3 818.0 811.3 DAY 31 29 18 30 27 21 11 15 12 29 8 11 MEAN QNH PRESSURE IN HPA 1013.1 1012.3 1009.2 1010.6 1011.5 1011.5 1008.6 1012.9 1013.7 1018.0 1017.3 1016.0 1012.9 MAX. QNH PRESSURE IN HPA 1022.2 1018.7 1017.5 1018.3 1017.6 1016.8 1013.2 1019.5 1020.1 1022.2 1022.0 1023.0 1023.0 DAY 26 13 14 15 15 6 25 31 30 26 13 3 MIN. QNH PRESSURE IN HPA 1003.5 997.7 1003.3 1000.0 1006.4 1004.5 1001.5 1007.4 1008.4 1012.7 1007.2 1005.6 997.7 DAY 31 29 18 30 27 21 11 15 12 29 8 11 MEAN QFF PRESSURE IN HPA 1020.1 1012.8 1007.7 1004.2 1001.3 997.5 992.4 998.8 1002.7 1011.6 1014.0 ****** ****** MAX. QFF PRESSURE IN HPA 1035.3 1025.8 1018.3 1015.5 1006.9 1003.1 999.2 1008.1 1014.5 1018.0 1021.2 ****** ****** DAY 26 2 14 2 23 5 29 31 30 26 13 ** MIN. QFF PRESSURE IN HPA 1003.4 993.2 999.0 992.5 993.8 989.8 984.8 991.8 996.5 1004.1 1000.5 ****** ****** DAY 31 29 29 30 26 27 11 15 12 17 8 ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1956 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 825.0 824.5 821.5 822.2 822.6 822.5 820.3 824.6 825.6 829.3 828.8 827.7 824.5 MAX. QFE PRESSURE IN HPA 832.3 830.0 828.8 827.2 826.8 829.3 825.4 830.4 830.8 832.8 833.5 833.8 833.8 DAY 26 13 14 10 22 6 24 30 30 26 20 3 MIN. QFE PRESSURE IN HPA 816.8 812.2 814.8 811.7 816.4 816.1 815.0 819.2 821.2 824.7 820.4 819.4 811.7 DAY 31 29 29 6 30 21 11 15 12 17 8 11 MEAN QNH PRESSURE IN HPA 1013.9 1013.3 1009.7 1010.7 1011.1 1011.0 1008.4 1013.4 1014.6 1019.0 1018.4 1017.2 1013.4 MAX. QNH PRESSURE IN HPA 1022.5 1019.8 1018.4 1016.5 1016.0 1019.0 1014.4 1020.3 1020.8 1023.1 1024.0 1024.3 1024.3 DAY 26 13 14 10 22 6 24 30 30 26 20 3 MIN. QNH PRESSURE IN HPA 1004.2 998.8 1001.9 998.2 1003.8 1003.4 1002.1 1007.1 1009.4 1013.6 1008.5 1007.3 998.2 DAY 31 29 29 6 30 21 11 15 12 17 8 11 MEAN QFF PRESSURE IN HPA 1021.0 ****** ****** ****** 1000.0 996.5 991.3 998.5 1003.0 1012.2 ****** ****** ****** MAX. QFF PRESSURE IN HPA 1038.2 ****** ****** ****** 1006.2 1005.8 998.5 1008.6 1013.9 1018.6 ****** ****** ****** DAY 20 ** ** ** 22 6 24 31 30 26 ** ** MIN. QFF PRESSURE IN HPA 1004.6 ****** ****** ****** 992.8 988.0 983.9 990.3 996.3 1003.9 ****** ****** ****** DAY 31 ** ** ** 28 28 11 15 12 17 ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 824.0 823.8 820.9 822.1 821.7 821.4 819.1 823.3 824.1 827.9 827.8 826.9 823.6 MAX. QFE PRESSURE IN HPA 832.2 829.2 827.3 826.7 826.6 827.0 823.4 828.9 830.0 832.5 833.4 834.1 834.1 DAY 26 13 14 9 22 6 30 30 30 13 20 1 MIN. QFE PRESSURE IN HPA 815.5 812.2 813.3 811.2 814.3 815.4 812.7 816.7 820.3 823.5 818.5 818.5 811.2 DAY 15 29 29 6 30 28 11 15 11 17 8 10 MEAN QNH PRESSURE IN HPA 1012.8 1012.5 1009.1 1010.5 1010.1 1009.7 1007.0 1011.9 1012.9 1017.3 1017.2 1016.2 1012.3 MAX. QNH PRESSURE IN HPA 1022.4 1018.9 1016.6 1015.9 1015.8 1016.3 1012.0 1018.5 1019.8 1022.8 1023.9 1024.7 1024.7 DAY 26 13 14 9 22 6 30 30 30 13 20 1 MIN. QNH PRESSURE IN HPA 1002.7 998.8 1000.1 997.6 1001.3 1002.6 999.4 1004.1 1008.4 1012.1 1006.2 1006.2 997.6 DAY 15 29 29 6 30 28 11 15 11 17 8 10 MEAN QFF PRESSURE IN HPA 1018.7 ****** ****** ****** 998.2 994.5 988.7 995.3 999.4 1008.3 ****** ****** ****** MAX. QFF PRESSURE IN HPA 1034.4 ****** ****** ****** 1006.3 1002.2 995.4 1004.2 1011.0 1015.0 ****** ****** ****** DAY 20 ** ** ** 22 6 29 31 30 26 ** ** MIN. QFF PRESSURE IN HPA 1003.8 ****** ****** ****** 989.4 985.2 979.9 986.2 993.8 1001.6 ****** ****** ****** DAY 30 ** ** ** 30 28 11 15 11 17 ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 823.3 822.7 819.9 822.4 821.1 820.8 818.3 822.0 822.7 826.6 826.7 825.9 822.7 MAX. QFE PRESSURE IN HPA 830.7 828.2 825.6 828.4 824.4 827.2 822.8 828.2 828.7 830.1 832.3 832.0 832.3 DAY 26 4 6 16 22 6 29 31 30 26 20 2 MIN. QFE PRESSURE IN HPA 815.8 812.5 811.3 814.8 815.1 814.7 811.7 816.6 818.0 822.7 818.6 818.3 811.3 DAY 15 29 29 30 27 27 11 15 11 17 8 10 MEAN QNH PRESSURE IN HPA 1011.9 1011.2 1007.9 1010.8 1009.3 1009.0 1006.1 1010.4 1011.2 1015.8 1015.9 1015.0 1011.2 MAX. QNH PRESSURE IN HPA 1020.7 1017.7 1014.6 1017.9 1013.2 1016.5 1011.3 1017.7 1018.3 1019.9 1022.5 1022.2 1022.5 DAY 26 4 6 16 22 6 29 31 30 26 20 2 MIN. QNH PRESSURE IN HPA 1003.0 999.1 997.7 1001.9 1002.2 1001.7 998.2 1004.0 1005.6 1011.2 1006.4 1006.0 997.7 DAY 15 29 29 30 27 27 11 15 11 17 8 10 MEAN QFF PRESSURE IN HPA 1017.8 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1033.9 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 20 ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1004.5 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 30 ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1956 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 823.9 823.3 820.0 822.0 821.1 821.4 818.7 822.0 822.6 826.7 827.3 826.3 822.9 MAX. QFE PRESSURE IN HPA 830.7 828.7 825.3 829.0 825.2 827.7 823.3 828.6 829.0 831.2 832.6 832.2 832.6 DAY 26 4 6 4 22 6 1 30 30 26 20 2 MIN. QFE PRESSURE IN HPA 817.2 816.1 812.2 814.1 815.5 817.1 813.2 816.3 815.2 823.0 820.1 818.9 812.2 DAY 28 28 29 29 27 27 19 15 1 28 8 10 MEAN QNH PRESSURE IN HPA 1012.7 1011.9 1008.0 1010.4 1009.4 1009.6 1006.5 1010.4 1011.1 1016.0 1016.6 1015.5 1011.5 MAX. QNH PRESSURE IN HPA 1020.7 1018.3 1014.3 1018.7 1014.2 1017.1 1011.9 1018.2 1018.7 1021.3 1022.9 1022.4 1022.9 DAY 26 4 6 4 22 6 1 30 30 26 20 2 MIN. QNH PRESSURE IN HPA 1004.7 1003.4 998.8 1001.0 1002.7 1004.6 1000.0 1003.6 1002.3 1011.6 1008.1 1006.7 998.8 DAY 28 28 29 29 27 27 19 15 1 28 8 10 MEAN QFF PRESSURE IN HPA 1019.5 1012.3 1006.3 1003.8 998.9 995.5 990.2 996.2 1000.0 1009.4 1013.3 ****** ****** MAX. QFF PRESSURE IN HPA 1035.8 1023.8 1012.5 1017.7 1004.7 1000.9 996.7 1006.0 1013.5 1016.9 1021.5 ****** ****** DAY 20 1 6 1 22 6 1 30 30 26 13 ** MIN. QFF PRESSURE IN HPA 1005.4 1001.0 994.9 992.8 991.8 986.4 982.4 987.8 989.1 1003.6 1002.4 ****** ****** DAY 30 29 29 29 26 25 11 15 1 17 8 ** PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 824.3 ****** ****** ****** 821.8 822.3 819.7 822.6 824.0 827.8 ****** ****** ****** MAX. QFE PRESSURE IN HPA 830.3 ****** ****** ****** 825.4 828.0 824.0 829.5 829.5 832.0 ****** ****** ****** DAY 25 ** ** ** 22 6 1 30 30 25 ** ** MIN. QFE PRESSURE IN HPA 817.7 ****** ****** ****** 815.6 817.5 813.5 817.3 819.3 823.6 ****** ****** ****** DAY 30 ** ** ** 30 27 11 15 11 17 ** ** MEAN QNH PRESSURE IN HPA 1013.1 ****** ****** ****** 1010.2 1010.8 1007.6 1011.0 1012.7 1017.2 ****** ****** ****** MAX. QNH PRESSURE IN HPA 1020.2 ****** ****** ****** 1014.4 1017.5 1012.7 1019.2 1019.2 1022.2 ****** ****** ****** DAY 25 ** ** ** 22 6 1 30 30 25 ** ** MIN. QNH PRESSURE IN HPA 1005.3 ****** ****** ****** 1002.8 1005.1 1000.3 1004.8 1007.2 1012.3 ****** ****** ****** DAY 30 ** ** ** 30 27 11 15 11 17 ** ** MEAN QFF PRESSURE IN HPA 1020.1 ****** ****** ****** 999.0 996.4 990.8 996.3 1001.2 1010.4 ****** ****** ****** MAX. QFF PRESSURE IN HPA 1038.1 ****** ****** ****** 1004.5 1003.7 996.5 1006.8 1013.0 1017.5 ****** ****** ****** DAY 20 ** ** ** 22 6 1 30 30 25 ** ** MIN. QFF PRESSURE IN HPA 1005.7 ****** ****** ****** 991.4 989.0 982.0 988.3 994.6 1002.5 ****** ****** ****** DAY 30 ** ** ** 30 25 11 15 11 17 ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 824.4 ****** ****** ****** 822.3 822.9 820.1 822.8 824.0 827.8 ****** ****** ****** MAX. QFE PRESSURE IN HPA 831.7 ****** ****** ****** 826.9 828.2 824.5 829.3 829.4 832.0 ****** ****** ****** DAY 25 ** ** ** 22 6 1 30 29 25 ** ** MIN. QFE PRESSURE IN HPA 817.0 ****** ****** ****** 813.1 817.7 813.8 817.5 819.2 823.7 ****** ****** ****** DAY 14 ** ** ** 30 27 11 14 11 28 ** ** MEAN QNH PRESSURE IN HPA 1013.2 ****** ****** ****** 1010.8 1011.4 1008.1 1011.3 1012.8 1017.3 ****** ****** ****** MAX. QNH PRESSURE IN HPA 1021.8 ****** ****** ****** 1016.2 1017.7 1013.3 1019.0 1019.1 1022.2 ****** ****** ****** DAY 25 ** ** ** 22 6 1 30 29 25 ** ** MIN. QNH PRESSURE IN HPA 1004.5 ****** ****** ****** 999.9 1005.3 1000.7 1005.1 1007.1 1012.4 ****** ****** ****** DAY 14 ** ** ** 30 27 11 14 11 28 ** ** MEAN QFF PRESSURE IN HPA 1019.3 ****** ****** ****** 999.0 996.4 990.4 995.0 999.5 1008.4 ****** ****** ****** MAX. QFF PRESSURE IN HPA 1035.6 ****** ****** ****** 1007.4 1003.5 996.4 1004.7 1011.2 1015.5 ****** ****** ****** DAY 19 ** ** ** 22 6 4 30 30 25 ** ** MIN. QFF PRESSURE IN HPA 1004.9 ****** ****** ****** 987.6 988.1 980.8 987.3 992.4 1002.3 ****** ****** ****** DAY 30 ** ** ** 30 27 11 14 11 17 ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1957 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -6.9 -5.4 6.3 10.3 15.5 22.2 26.2 24.9 21.6 14.1 6.3 3.1 11.5 MINIMUN AIR TEMPERATURE (C) -11.5 -10.6 2.0 5.7 9.3 13.8 17.4 16.4 13.3 8.7 3.1 -0.1 5.6 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 2 1 0 0 0 0 3 DAYS WITH MINIMUM TEMP. <=-4 28 25 1 0 0 0 0 0 0 0 2 5 61 DAYS WITH FREEZING MIN.<= 0 31 28 9 1 0 0 0 0 0 0 7 18 94 TEMPERATURE RECORDS LOWEST(C) -21.0 -21.0 -4.0 0.0 5.0 8.0 13.0 14.0 11.0 4.0 -5.0 -9.0 -21.0 DAY 15 8 3 5 1 8 5 23 26 15 24 28 MAXIMUM AIR TEMPERATURE (C) -1.8 0.9 11.7 15.9 22.2 30.7 34.2 33.4 31.1 20.6 10.5 7.5 18.1 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 20 31 30 25 0 0 0 106 DAYS WITH MAXIMUM TEMP. <= 0 22 14 0 0 0 0 0 0 0 0 1 1 38 TEMPERATURE RECORDS HIGHEST(C) 6.0 8.0 19.0 24.0 29.0 37.0 39.0 38.0 35.0 29.0 18.0 16.0 39.0 DAY 6 14 23 19 31 19 27 7 8 2 2 19 DIF. BETWEEN (MAX.-MIN.) (C) 9.7 11.5 9.7 10.2 12.9 16.9 16.8 17.0 17.8 11.9 7.4 7.6 12.5 MEAN DAILY TEMP. (MDT) (C) -6.7 -4.9 6.8 10.8 15.8 22.3 25.8 24.9 22.2 14.6 6.8 3.7 11.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 61.0 148.5 121.5 39.5 1.0 0.0 0.0 371.5 HEATING DEG. DAYS(BASE 18 0C) 764.5 640.0 346.0 215.5 75.5 8.0 0.0 0.0 0.0 120.0 336.0 443.5 2949.0 DEWPOINT (MEAN C) -11.4 -9.8 -0.8 2.7 5.5 8.9 8.2 9.0 7.9 6.3 2.4 -1.8 2.3 MIXING RATIO (G/KG) 2.24 2.53 4.48 5.78 7.00 8.89 8.48 8.94 8.22 7.38 5.66 4.15 6.15 VAPOUR PRESSURE (HPA) 2.95 3.34 5.89 7.59 9.17 11.59 11.05 11.67 10.78 9.71 7.45 5.48 8.06 SATURATION DEF. (HPA) 0.97 1.07 4.01 5.56 9.20 16.76 24.42 21.49 16.46 7.40 2.49 2.47 9.36 RELATIVE HUMIDITY (MEAN %) 72 72 63 63 54 45 34 38 43 63 77 72 58 RELATIVE HUMIDITY (MAX. %) 84 80 81 81 77 64 52 55 63 76 88 84 74 RELATIVE HUMIDITY (MIN. %) 57 61 48 47 37 30 23 26 28 49 64 58 44 RELATIVE HUMIDITY (MEAN% 03UTC) 66 63 77 79 76 63 52 54 60 72 84 76 69 RELATIVE HUMIDITY (MEAN% 09UTC) 75 76 58 57 44 38 27 29 32 53 71 67 52 RELATIVE HUMIDITY (MEAN% 15UTC) 74 74 58 59 49 36 27 33 39 61 78 71 55 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 99.2 60.6 49.3 105.8 61.0 5.0 0.0 6.0 0.0 71.3 79.0 17.6 554.8 DAYS WITH PRECIPITATION >=10 4 2 2 3 3 0 0 0 0 3 3 0 20 DAYS WITH PRECIPITATION >= 5 6 3 5 10 5 0 0 1 0 3 5 1 39 DAYS WITH PRECIPITATION >= 1 13 3 7 16 8 2 0 1 0 8 11 5 74 DAYS WITH PRECIPITATION 15 6 8 17 8 2 0 1 0 9 14 6 86 GREATEST DAILY PRECIPITATION 23.0 39.0 16.0 24.0 24.0 4.0 0.0 6.0 0.0 35.0 22.0 8.0 39.0 DAY 20 27 14 28 7 6 ** 18 ** 11 30 21 DAY WITH THUNDER STORM 0 0 0 5 2 1 0 0 2 2 0 0 12 DAYS WITH SNOW OR SLEET 16 5 2 3 0 0 0 0 0 0 1 2 29 DAYS WITH DUST 0 4 0 0 0 0 2 0 0 0 0 0 6 WIND DIRECTION (PREVAILING) 270 180 180 180 180 270 270 180 270 225 180 225 180 PREVAILING WIND SPEED(KNOTS) 12.7 9.6 9.1 9.0 9.9 12.2 11.4 9.4 10.3 9.8 8.9 8.0 9.3 PREVAILING WIND PERCENT 4.1 7.7 22.6 10.0 9.7 2.4 8.3 4.6 4.8 10.1 3.8 4.6 7.1 CALMS PERCENT OF WIND 90.8 85.7 58.5 79.0 76.0 92.4 76.5 86.6 86.2 71.0 92.8 87.1 81.8 NO. OF WIND OBSERVATION 217 196 217 210 217 210 217 217 210 217 209 217 2554 VECTOR WIND DIRECTION (MEAN) 239 205 218 226 225 224 231 239 214 223 219 232 224 VECTOR WIND MAGNITUDE(KNOTS) 0.9 1.1 3.5 1.6 2.0 0.4 2.0 0.9 0.5 2.3 0.5 1.0 1.4 WIND STEADINESES (MEAN %) 81.8 84.6 83.3 84.2 80.0 50.0 76.9 64.3 38.5 82.1 83.3 90.9 77.8 WIND SPEED (MEAN KNOTS) 1.1 1.3 4.2 1.9 2.5 0.8 2.6 1.4 1.3 2.8 0.6 1.1 1.8 FASTEST WIND DIRECTION 240 250 270 200 270 270 270 270 270 270 240 270 270 FASTEST WIND SPEED (KNOTS) 20 15 24 15 18 15 15 15 15 16 16 15 24 DAY 6 12 14 1 24 5 2 22 28 10 15 9 DAYS WITH SKY CLEAR (0-2)/8 8 16 5 6 6 20 27 27 27 14 5 12 173 DAYS WITH P.CLOUDY (3-6)/8 7 8 14 8 14 8 4 4 3 9 11 14 104 DAYS WITH CLOUDY (7-8)/8 16 4 12 16 11 2 0 0 0 8 14 5 88 DAYS WITH VISIBILITY =< 2 KM 5 7 0 0 0 1 2 1 0 0 2 0 18 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1957 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 822.6 825.9 823.4 824.0 824.6 823.3 821.9 823.9 827.1 828.8 827.0 826.5 824.9 MAX. QFE PRESSURE IN HPA 831.0 832.2 832.0 830.5 830.8 827.8 829.5 828.9 831.5 834.2 832.8 832.0 834.2 DAY-HOUR 13-18 8- 9 2- 9 17- 6 11- 6 18- 6 5- 6 4- 6 23- 9 30- 6 24- 6 22-18 MIN. QFE PRESSURE IN HPA 808.0 817.8 813.6 817.5 821.2 818.0 815.8 815.7 822.8 823.3 818.5 818.5 808.0 DAY-HOUR 19-15 27- 3 14-15 3-12 21-15 5-12 14-18 8-15 28-18 10-12 18-12 6-21 MEAN QNH PRESSURE IN HPA 1011.1 1015.0 1012.1 1012.8 1013.4 1011.9 1010.2 1012.6 1016.4 1018.4 1016.3 1015.7 1013.8 MAX. QNH PRESSURE IN HPA 1021.0 1022.4 1022.2 1020.4 1020.8 1017.2 1019.2 1018.5 1021.6 1024.8 1023.1 1022.2 1024.8 DAY-HOUR 13-18 8- 9 2- 9 17- 6 11- 6 18- 6 5- 6 4- 6 23- 9 30- 6 24- 6 22-18 MIN. QNH PRESSURE IN HPA 993.8 1005.4 1000.4 1005.1 1009.4 1005.6 1003.0 1002.9 1011.3 1011.9 1006.2 1006.2 993.8 DAY-HOUR 19-15 27- 3 14-15 3-12 21-15 5-12 14-18 8-15 28-18 10-12 18-12 6-21 MEAN QFF PRESSURE IN HPA 1019.8 1022.6 1010.4 1008.1 1005.2 999.2 995.0 998.2 1004.3 1011.0 1014.5 1016.5 1008.7 MAX. QFF PRESSURE IN HPA 1034.2 1037.9 1025.0 1014.3 1013.0 1007.5 1005.7 1005.2 1010.4 1020.1 1028.1 1027.5 1037.9 DAY-HOUR 25-18 8- 3 2- 9 5- 6 28- 6 8- 6 5- 6 31- 6 23- 6 13- 3 24- 6 30- 3 MIN. QFF PRESSURE IN HPA 998.1 1005.2 998.9 1000.8 1000.6 993.0 985.8 987.0 998.7 1000.0 1002.9 1002.1 985.8 DAY-HOUR 19-15 27- 9 25- 9 20- 3 20-15 27-15 15- 9 8-15 28-21 10- 9 18- 3 19-15 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 822.5 825.7 823.6 824.0 824.9 823.9 822.7 824.5 827.4 828.8 827.1 826.6 825.1 MAX. QFE PRESSURE IN HPA 830.2 831.8 831.0 830.1 829.8 827.1 827.8 828.0 830.2 832.5 832.0 831.3 832.5 DAY 14 8 2 17 11 18 5 4 23 20 24 23 MIN. QFE PRESSURE IN HPA 811.3 817.8 815.7 818.6 822.7 820.5 818.3 818.3 823.0 824.5 818.7 819.2 811.3 DAY 19 27 7 4 2 5 13 8 26 23 18 7 MEAN QNH PRESSURE IN HPA 1011.0 1014.8 1012.2 1012.8 1013.8 1012.7 1011.2 1013.4 1016.7 1018.4 1016.4 1015.8 1014.1 MAX. QNH PRESSURE IN HPA 1020.1 1022.0 1021.0 1019.9 1019.6 1016.4 1017.2 1017.5 1020.1 1022.8 1022.2 1021.4 1022.8 DAY 14 8 2 17 11 18 5 4 23 20 24 23 MIN. QNH PRESSURE IN HPA 997.7 1005.4 1002.9 1006.4 1011.2 1008.6 1006.0 1006.0 1011.6 1013.3 1006.5 1007.1 997.7 DAY 19 27 7 4 2 5 13 8 26 23 18 7 MEAN QFF PRESSURE IN HPA 1020.0 1022.8 1010.8 1008.6 1006.1 1000.6 996.8 999.9 1005.5 1011.9 1015.0 1016.9 1009.6 MAX. QFF PRESSURE IN HPA 1033.5 1037.9 1023.9 1014.0 1011.8 1006.9 1004.5 1005.0 1009.1 1020.1 1027.1 1027.5 1037.9 DAY 26 8 2 5 11 8 5 31 23 13 24 30 MIN. QFF PRESSURE IN HPA 1001.9 1005.5 999.0 1000.8 1001.6 995.2 989.4 990.1 1001.7 1001.7 1002.9 1003.8 989.4 DAY 20 27 7 20 24 30 15 8 26 9 18 20 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1957 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 823.4 826.2 824.1 824.7 825.4 824.3 823.0 825.2 828.2 829.8 827.8 827.3 825.8 MAX. QFE PRESSURE IN HPA 830.0 832.0 831.7 830.5 830.8 827.8 829.5 828.9 831.4 834.2 832.8 832.0 834.2 DAY 14 8 2 17 11 18 5 4 23 30 24 23 MIN. QFE PRESSURE IN HPA 810.6 818.2 816.4 819.0 823.0 819.0 818.4 818.5 825.0 824.9 819.4 820.5 810.6 DAY 19 27 7 4 8 5 12 8 26 10 18 7 MEAN QNH PRESSURE IN HPA 1012.0 1015.4 1012.9 1013.5 1014.4 1013.1 1011.5 1014.1 1017.7 1019.6 1017.2 1016.6 1014.8 MAX. QNH PRESSURE IN HPA 1019.8 1022.2 1021.8 1020.4 1020.8 1017.2 1019.2 1018.5 1021.5 1024.8 1023.1 1022.2 1024.8 DAY 14 8 2 17 11 18 5 4 23 30 24 23 MIN. QNH PRESSURE IN HPA 996.9 1005.9 1003.8 1006.8 1011.6 1006.8 1006.1 1006.2 1013.9 1013.8 1007.3 1008.6 996.9 DAY 19 27 7 4 8 5 12 8 26 10 18 7 MEAN QFF PRESSURE IN HPA 1021.0 1023.6 1011.4 1009.0 1005.9 1000.3 996.2 999.7 1006.1 1012.4 1015.5 1017.7 1009.9 MAX. QFF PRESSURE IN HPA 1033.5 1036.0 1024.2 1014.3 1013.0 1007.5 1005.7 1005.2 1010.4 1020.0 1028.1 1027.0 1036.0 DAY 26 8 2 5 28 8 5 31 23 13 24 30 MIN. QFF PRESSURE IN HPA 1004.2 1005.9 999.4 1003.1 1002.0 995.0 989.4 989.7 1002.9 1001.9 1004.1 1004.3 989.4 DAY 19 27 7 20 24 5 15 8 29 10 18 20 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 823.0 826.4 823.9 824.4 825.0 823.7 822.2 824.2 827.6 829.2 827.2 826.7 825.3 MAX. QFE PRESSURE IN HPA 829.4 832.2 832.0 830.0 830.5 827.0 827.8 828.5 831.5 833.2 831.8 831.5 833.2 DAY 14 8 2 16 11 18 5 4 23 20 24 14 MIN. QFE PRESSURE IN HPA 809.7 818.4 815.5 819.1 822.3 818.6 817.3 818.0 825.2 823.8 819.0 820.5 809.7 DAY 19 27 14 4 20 5 15 8 26 10 18 20 MEAN QNH PRESSURE IN HPA 1011.6 1015.5 1012.6 1013.3 1013.9 1012.4 1010.7 1013.0 1017.0 1018.8 1016.5 1015.9 1014.3 MAX. QNH PRESSURE IN HPA 1019.1 1022.4 1022.2 1019.8 1020.4 1016.3 1017.2 1018.1 1021.6 1023.6 1022.0 1021.6 1023.6 DAY 14 8 2 16 11 18 5 4 23 20 24 14 MIN. QNH PRESSURE IN HPA 995.8 1006.1 1002.7 1006.9 1010.7 1006.4 1004.8 1005.6 1014.2 1012.5 1006.8 1008.6 995.8 DAY 19 27 14 4 20 5 15 8 26 10 18 20 MEAN QFF PRESSURE IN HPA 1019.4 1022.0 1010.1 1007.7 1005.0 998.6 994.3 997.1 1003.0 1010.0 1013.8 1015.7 1008.1 MAX. QFF PRESSURE IN HPA 1032.6 1036.1 1025.0 1013.6 1010.4 1006.4 1003.2 1001.9 1007.8 1018.1 1025.6 1024.9 1036.1 DAY 26 8 2 5 11 8 5 4 23 13 24 30 MIN. QFF PRESSURE IN HPA 1000.5 1005.2 998.9 1002.9 1000.8 993.3 985.8 987.7 999.5 1000.0 1003.4 1002.6 985.8 DAY 19 27 25 20 20 28 15 8 14 10 18 20 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 822.1 825.6 822.8 823.5 824.1 822.6 821.1 823.0 826.4 828.1 826.3 825.8 824.3 MAX. QFE PRESSURE IN HPA 829.4 831.0 831.5 829.0 828.8 825.5 827.0 827.0 831.0 832.5 830.0 830.8 832.5 DAY 14 8 2 16 11 17 5 4 23 20 23 14 MIN. QFE PRESSURE IN HPA 808.9 818.7 814.3 817.5 821.5 818.0 816.0 817.0 823.7 823.3 818.5 820.2 808.9 DAY 19 11 14 3 20 5 15 8 14 10 18 20 MEAN QNH PRESSURE IN HPA 1010.5 1014.6 1011.3 1012.1 1012.8 1011.1 1009.3 1011.5 1015.6 1017.6 1015.4 1014.9 1013.1 MAX. QNH PRESSURE IN HPA 1019.1 1021.0 1021.6 1018.7 1018.4 1014.5 1016.3 1016.3 1021.0 1022.8 1019.8 1020.8 1022.8 DAY 14 8 2 16 11 17 5 4 23 20 23 14 MIN. QNH PRESSURE IN HPA 994.9 1006.5 1001.3 1005.1 1009.8 1005.6 1003.3 1004.5 1012.4 1011.9 1006.2 1008.2 994.9 DAY 19 11 14 3 20 5 15 8 14 10 18 20 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1957 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 822.3 825.5 822.7 823.4 823.7 822.2 820.5 822.5 826.0 828.1 826.5 826.1 824.1 MAX. QFE PRESSURE IN HPA 830.4 831.2 831.5 828.3 828.0 825.0 827.0 826.4 829.3 832.0 831.7 831.0 832.0 DAY 14 7 2 16 11 17 30 31 23 19 23 14 MIN. QFE PRESSURE IN HPA 808.0 819.5 813.6 818.4 821.2 818.1 816.0 815.7 823.5 823.6 820.9 820.5 808.0 DAY 19 11 14 3 21 5 11 8 28 22 17 6 MEAN QNH PRESSURE IN HPA 1010.7 1014.6 1011.2 1012.0 1012.4 1010.6 1008.6 1010.9 1015.1 1017.6 1015.7 1015.2 1012.9 MAX. QNH PRESSURE IN HPA 1020.3 1021.3 1021.6 1017.8 1017.5 1013.9 1016.3 1015.6 1019.0 1022.2 1021.8 1021.0 1022.2 DAY 14 7 2 16 11 17 30 31 23 19 23 14 MIN. QNH PRESSURE IN HPA 993.8 1007.4 1000.4 1006.1 1009.4 1005.8 1003.3 1002.9 1012.1 1012.3 1009.1 1008.6 993.8 DAY 19 11 14 3 21 5 11 8 28 22 17 6 MEAN QFF PRESSURE IN HPA 1019.5 1022.4 1009.7 1007.6 1004.6 998.4 994.2 997.3 1003.7 1011.0 1014.2 1016.2 1008.2 MAX. QFF PRESSURE IN HPA 1034.2 1036.2 1024.4 1011.9 1009.6 1003.6 1002.4 1002.9 1007.4 1018.8 1025.4 1025.9 1036.2 DAY 25 8 2 5 10 8 5 31 23 12 23 29 MIN. QFF PRESSURE IN HPA 998.1 1007.9 999.7 1001.1 1000.6 993.0 988.1 987.0 1000.7 1001.3 1005.6 1002.1 987.0 DAY 19 27 25 19 20 27 15 8 6 9 17 19 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 822.6 826.0 823.5 824.1 824.6 823.2 821.7 823.9 827.1 828.7 827.1 826.6 824.9 MAX. QFE PRESSURE IN HPA 831.0 831.5 831.5 829.3 829.0 826.3 828.0 827.4 829.8 832.6 832.0 832.0 832.6 DAY 13 7 2 16 10 17 29 3 22 20 23 22 MIN. QFE PRESSURE IN HPA 809.5 819.5 815.4 818.5 822.5 820.0 815.8 817.5 822.8 824.5 821.5 820.5 809.5 DAY 19 26 14 3 6 5 14 8 28 22 17 6 MEAN QNH PRESSURE IN HPA 1011.1 1015.1 1012.2 1012.8 1013.4 1011.8 1010.1 1012.7 1016.4 1018.3 1016.5 1015.8 1013.8 MAX. QNH PRESSURE IN HPA 1021.0 1021.6 1021.6 1019.0 1018.7 1015.5 1017.5 1016.8 1019.6 1022.9 1022.2 1022.2 1022.9 DAY 13 7 2 16 10 17 29 3 22 20 23 22 MIN. QNH PRESSURE IN HPA 995.6 1007.4 1002.6 1006.2 1011.0 1008.0 1003.0 1005.1 1011.3 1013.3 1009.8 1008.6 995.6 DAY 19 26 14 3 6 5 14 8 28 22 17 6 MEAN QFF PRESSURE IN HPA 1020.0 1023.2 1010.7 1008.4 1005.0 999.1 994.8 998.4 1004.8 1011.2 1015.0 1016.9 1008.9 MAX. QFF PRESSURE IN HPA 1034.2 1035.3 1024.1 1013.5 1010.2 1004.3 1002.8 1003.3 1008.4 1019.7 1026.6 1025.8 1035.3 DAY 25 7 2 5 10 8 5 29 22 12 23 29 MIN. QFF PRESSURE IN HPA 999.8 1008.6 1001.1 1002.0 1001.3 994.5 988.5 988.4 999.3 1002.0 1009.7 1003.8 988.4 DAY 19 27 25 19 6 28 14 8 28 8 18 19 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 822.5 825.8 823.5 824.2 824.7 823.4 822.0 824.1 827.2 828.8 827.1 826.5 825.0 MAX. QFE PRESSURE IN HPA 831.0 831.5 831.0 829.5 829.5 826.5 828.0 827.4 829.9 832.7 832.0 832.0 832.7 DAY 13 7 2 16 10 17 29 3 22 20 23 22 MIN. QFE PRESSURE IN HPA 810.0 819.1 816.3 818.4 822.5 820.2 817.5 818.0 823.5 824.5 820.5 818.5 810.0 DAY 19 26 14 3 6 27 11 8 28 22 17 6 MEAN QNH PRESSURE IN HPA 1011.0 1014.9 1012.1 1013.0 1013.6 1012.0 1010.4 1012.9 1016.5 1018.4 1016.4 1015.7 1013.9 MAX. QNH PRESSURE IN HPA 1021.0 1021.6 1021.0 1019.2 1019.2 1015.7 1017.5 1016.8 1019.7 1023.0 1022.2 1022.2 1023.0 DAY 13 7 2 16 10 17 29 3 22 20 23 22 MIN. QNH PRESSURE IN HPA 996.2 1006.9 1003.6 1006.1 1011.0 1008.2 1005.1 1005.6 1012.1 1013.3 1008.6 1006.2 996.2 DAY 19 26 14 3 6 27 11 8 28 22 17 6 MEAN QFF PRESSURE IN HPA 1018.9 1021.5 1009.6 1007.5 1004.7 998.4 994.2 997.2 1002.8 1009.9 1013.8 1015.6 1007.9 MAX. QFF PRESSURE IN HPA 1032.1 1034.9 1024.3 1013.3 1010.1 1004.6 1002.6 1001.8 1006.1 1019.3 1026.2 1024.9 1034.9 DAY 25 7 2 5 11 8 5 21 22 12 23 29 MIN. QFF PRESSURE IN HPA 998.5 1006.6 999.0 1001.0 1000.6 993.1 988.3 989.0 998.7 1000.2 1005.3 1002.5 988.3 DAY 19 26 6 19 31 27 15 8 28 8 17 19 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1958 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 2.4 3.3 11.3 16.0 19.1 24.0 27.2 26.4 21.4 15.2 4.5 3.0 14.5 MINIMUN AIR TEMPERATURE (C) -1.3 -2.1 5.5 9.8 11.4 15.2 18.2 17.7 12.7 8.2 -0.5 -0.5 7.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 4 0 0 0 0 0 4 DAYS WITH MINIMUM TEMP. <=-4 5 9 0 0 0 0 0 0 0 0 9 4 27 DAYS WITH FREEZING MIN.<= 0 26 22 1 0 0 0 0 0 0 0 14 20 83 TEMPERATURE RECORDS LOWEST(C) -6.0 -10.0 0.0 3.0 7.0 13.0 13.0 16.0 9.0 3.0 -12.0 -5.0 -12.0 DAY 1 1 2 13 6 1 17 7 25 31 23 26 MAXIMUM AIR TEMPERATURE (C) 6.9 9.6 17.3 22.9 27.5 32.7 36.2 35.7 31.4 23.7 10.5 7.5 21.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 4 13 26 31 31 18 0 0 0 123 DAYS WITH MAXIMUM TEMP. <= 0 0 1 0 0 0 0 0 0 0 0 2 0 3 TEMPERATURE RECORDS HIGHEST(C) 14.0 18.0 23.0 31.0 34.0 37.0 40.0 38.0 37.0 29.0 20.0 14.0 40.0 DAY 13 28 21 27 15 30 1 1 1 1 5 9 DIF. BETWEEN (MAX.-MIN.) (C) 8.2 11.7 11.8 13.1 16.1 17.5 18.0 18.0 18.7 15.5 11.0 8.0 13.9 MEAN DAILY TEMP. (MDT) (C) 2.8 3.8 11.4 16.4 19.4 23.9 27.2 26.7 22.0 16.0 5.0 3.5 14.8 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.5 13.5 88.5 191.5 176.5 49.5 0.5 0.0 0.0 520.5 HEATING DEG. DAYS(BASE 18 0C) 470.5 399.0 205.5 68.5 18.5 0.0 0.0 0.0 0.0 72.5 389.5 449.5 2073.5 DEWPOINT (MEAN C) -1.8 -3.5 -0.6 2.5 5.4 9.2 10.7 8.5 4.3 1.4 -3.3 -0.6 2.7 MIXING RATIO (G/KG) 4.12 3.63 4.58 5.70 7.12 9.20 10.36 8.80 6.46 5.27 3.81 4.53 6.13 VAPOUR PRESSURE (HPA) 5.42 4.80 6.02 7.48 9.36 11.98 13.42 11.46 8.47 6.94 5.04 5.97 8.03 SATURATION DEF. (HPA) 2.01 3.38 7.80 11.71 13.97 19.13 24.30 24.70 18.63 11.14 4.06 1.85 11.89 RELATIVE HUMIDITY (MEAN %) 75 64 47 44 44 41 38 34 34 42 60 79 50 RELATIVE HUMIDITY (MAX. %) 87 83 67 63 65 58 51 48 48 58 78 89 66 RELATIVE HUMIDITY (MIN. %) 61 49 30 28 27 29 28 24 23 27 43 66 36 RELATIVE HUMIDITY (MEAN% 03UTC) 82 78 61 57 61 57 50 48 46 54 67 83 62 RELATIVE HUMIDITY (MEAN% 09UTC) 70 51 36 35 32 33 32 28 28 32 52 72 42 RELATIVE HUMIDITY (MEAN% 15UTC) 74 58 42 37 36 35 32 27 28 37 58 79 45 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 51.6 3.0 42.8 45.2 12.8 4.6 0.0 0.0 0.0 0.3 2.9 37.4 200.6 DAYS WITH PRECIPITATION >=10 1 0 1 1 0 0 0 0 0 0 0 2 5 DAYS WITH PRECIPITATION >= 5 4 0 4 2 0 0 0 0 0 0 0 3 13 DAYS WITH PRECIPITATION >= 1 9 1 6 4 5 2 0 0 0 0 1 6 34 DAYS WITH PRECIPITATION 10 1 8 6 7 3 1 0 0 3 5 9 53 GREATEST DAILY PRECIPITATION 17.0 3.0 15.0 32.0 4.0 3.0 0.0 0.0 0.0 0.3 1.2 15.0 32.0 DAY 30 14 25 5 22 1 ** ** ** 15 30 31 DAY WITH THUNDER STORM 0 0 1 0 5 1 1 0 0 0 0 0 8 DAYS WITH SNOW OR SLEET 7 1 0 0 0 0 0 0 0 0 3 4 15 DAYS WITH DUST 2 4 0 10 4 16 17 26 9 19 2 0 109 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 45 45 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 9.4 9.4 11.1 20.5 16.2 11.3 7.8 8.7 6.5 9.6 10.0 9.6 11.7 PREVAILING WIND PERCENT 7.4 14.5 12.0 25.2 16.7 21.0 21.2 20.4 14.8 24.9 13.6 13.4 15.0 CALMS PERCENT OF WIND 84.8 71.0 77.8 58.1 76.4 59.5 39.2 36.1 67.6 57.1 72.3 84.8 65.3 NO. OF WIND OBSERVATION 217 193 216 210 216 210 217 216 210 217 206 217 2545 VECTOR WIND DIRECTION (MEAN) 239 241 245 255 267 269 11 29 0 268 275 266 268 VECTOR WIND MAGNITUDE(KNOTS) 1.3 2.3 2.1 7.7 2.6 2.0 1.7 3.1 0.0 1.4 0.5 1.2 1.5 WIND STEADINESES (MEAN %) 86.7 88.5 87.5 95.1 74.3 50.0 36.2 57.4 0.0 38.9 22.7 85.7 42.9 WIND SPEED (MEAN KNOTS) 1.5 2.6 2.4 8.1 3.5 4.0 4.7 5.4 2.1 3.6 2.2 1.4 3.5 FASTEST WIND DIRECTION 270 270 270 270 260 270 260 30 270 270 270 270 270 FASTEST WIND SPEED (KNOTS) 16 15 18 55 35 25 15 18 15 24 29 16 55 DAY 31 17 3 20 3 5 8 3 11 29 20 28 DAYS WITH SKY CLEAR (0-2)/8 7 16 13 6 6 24 21 27 30 19 11 6 186 DAYS WITH P.CLOUDY (3-6)/8 12 10 11 17 19 6 8 4 0 10 9 8 114 DAYS WITH CLOUDY (7-8)/8 12 2 7 7 6 0 1 0 0 2 10 17 64 DAYS WITH VISIBILITY =< 2 KM 2 1 0 3 1 0 0 1 0 0 0 7 15 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1958 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 824.7 825.7 823.9 824.8 826.9 822.4 820.0 822.0 823.9 827.5 829.1 825.7 824.7 MAX. QFE PRESSURE IN HPA 831.7 831.5 829.0 831.4 836.0 827.2 826.5 827.1 829.3 834.2 835.0 832.9 836.0 DAY-HOUR 13- 6 18- 9 1- 6 24- 9 13- 9 2- 6 16- 6 25- 3 20-12 22- 6 4- 6 5- 6 MIN. QFE PRESSURE IN HPA 813.0 817.5 816.3 817.0 821.0 817.0 812.0 816.0 818.4 821.7 820.0 818.5 812.0 DAY-HOUR 31-15 5-12 24-12 20- 6 19-12 20-15 9-12 7-15 4-12 15-12 30-21 1- 9 MEAN QNH PRESSURE IN HPA 1013.6 1014.8 1012.6 1013.6 1016.2 1010.8 1007.9 1010.3 1012.6 1016.8 1018.7 1014.8 1013.6 MAX. QNH PRESSURE IN HPA 1021.8 1021.6 1018.7 1021.5 1026.9 1016.5 1015.7 1016.4 1019.0 1024.8 1025.7 1023.3 1026.9 DAY-HOUR 13- 6 18- 9 1- 6 24- 9 13- 9 2- 6 16- 6 25- 3 20-12 22- 6 4- 6 5- 6 MIN. QNH PRESSURE IN HPA 999.7 1005.1 1003.6 1004.5 1009.2 1004.5 998.6 1003.3 1006.1 1010.0 1008.0 1006.2 998.6 DAY-HOUR 31-15 5-12 24-12 20- 6 19-12 20-15 9-12 7-15 4-12 15-12 30-21 1- 9 MEAN QFF PRESSURE IN HPA 1014.8 1015.5 1007.5 1005.2 1005.6 997.0 991.9 995.0 1000.8 1009.3 1018.7 1015.4 1006.4 MAX. QFF PRESSURE IN HPA 1023.5 1022.9 1018.0 1017.2 1017.5 1006.4 1002.3 1001.6 1008.6 1019.0 1033.3 1022.6 1033.3 DAY-HOUR 19-18 7-18 1- 6 24- 6 13- 6 2- 3 16- 3 25- 3 27- 6 22- 6 23- 6 20- 6 MIN. QFF PRESSURE IN HPA 1001.2 1006.1 997.2 992.1 997.7 988.8 983.3 987.6 991.7 1002.3 1006.4 1004.0 983.3 DAY-HOUR 30- 9 5-21 24- 9 20- 9 26- 9 20- 9 9- 9 2- 9 2- 9 9- 9 30-21 8-21 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 824.8 825.7 824.3 825.1 827.2 823.2 821.0 823.2 824.8 827.9 829.5 826.0 825.2 MAX. QFE PRESSURE IN HPA 830.5 831.0 828.7 830.5 834.5 827.0 826.4 827.1 827.9 832.8 834.2 831.3 834.5 DAY 14 19 28 24 13 2 29 25 15 23 4 5 MIN. QFE PRESSURE IN HPA 816.7 818.0 818.0 818.0 822.0 819.2 813.2 819.5 821.3 824.0 823.1 820.0 813.2 DAY 31 6 24 20 1 20 10 7 4 28 21 1 MEAN QNH PRESSURE IN HPA 1013.7 1014.7 1013.1 1014.0 1016.5 1011.8 1009.2 1011.8 1013.6 1017.4 1019.3 1015.1 1014.2 MAX. QNH PRESSURE IN HPA 1020.4 1021.0 1018.3 1020.4 1025.1 1016.3 1015.6 1016.4 1017.4 1023.1 1024.8 1021.4 1025.1 DAY 14 19 28 24 13 2 29 25 15 23 4 5 MIN. QNH PRESSURE IN HPA 1004.1 1005.6 1005.6 1005.6 1010.4 1007.1 1000.0 1007.4 1009.6 1012.7 1011.7 1008.0 1000.0 DAY 31 6 24 20 1 20 10 7 4 28 21 1 MEAN QFF PRESSURE IN HPA 1015.1 1015.9 1008.6 1006.0 1006.6 998.7 993.9 997.1 1002.4 1010.4 1019.6 1015.8 1007.5 MAX. QFF PRESSURE IN HPA 1022.8 1021.8 1016.4 1015.5 1016.3 1006.4 1002.3 1001.6 1008.5 1016.9 1032.7 1021.4 1032.7 DAY 20 2 1 24 13 2 16 25 25 23 23 20 MIN. QFF PRESSURE IN HPA 1005.1 1007.2 998.4 996.2 1001.1 993.0 986.6 992.3 994.9 1004.0 1009.2 1006.0 986.6 DAY 17 6 24 20 1 20 10 3 2 28 21 9 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1958 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 825.6 826.3 824.7 825.6 827.8 823.5 821.3 823.6 825.3 828.7 830.3 826.7 825.8 MAX. QFE PRESSURE IN HPA 831.7 831.0 829.0 831.2 835.5 827.2 826.5 827.1 828.3 834.2 835.0 832.9 835.5 DAY 13 19 1 24 13 2 16 25 30 22 4 5 MIN. QFE PRESSURE IN HPA 816.5 819.5 818.0 817.0 822.5 819.2 814.0 819.0 821.7 824.5 824.7 820.0 814.0 DAY 30 4 9 20 1 20 10 7 1 28 30 1 MEAN QNH PRESSURE IN HPA 1014.7 1015.5 1013.6 1014.7 1017.2 1012.1 1009.6 1012.2 1014.2 1018.3 1020.2 1015.9 1014.8 MAX. QNH PRESSURE IN HPA 1021.8 1021.0 1018.7 1021.3 1026.3 1016.5 1015.7 1016.4 1017.8 1024.8 1025.7 1023.3 1026.3 DAY 13 19 1 24 13 2 16 25 30 22 4 5 MIN. QNH PRESSURE IN HPA 1003.9 1007.4 1005.6 1004.5 1011.0 1007.1 1000.9 1006.8 1010.0 1013.3 1013.6 1008.0 1000.9 DAY 30 4 9 20 1 20 10 7 1 28 30 1 MEAN QFF PRESSURE IN HPA 1016.2 1016.9 1008.8 1006.6 1006.8 998.1 993.5 997.3 1002.8 1011.0 1020.4 1016.8 1007.9 MAX. QFF PRESSURE IN HPA 1023.5 1022.8 1018.0 1017.2 1017.5 1005.5 1001.8 1001.1 1008.6 1019.0 1033.3 1022.6 1033.3 DAY 12 8 1 24 13 2 16 25 27 22 23 20 MIN. QFF PRESSURE IN HPA 1005.4 1009.0 998.3 993.4 1000.3 991.9 986.4 992.1 995.4 1004.0 1011.0 1007.5 986.4 DAY 30 23 24 20 26 20 3 7 1 28 7 1 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 824.8 826.1 824.1 825.2 827.3 822.8 820.4 822.4 824.2 827.4 829.2 826.0 825.0 MAX. QFE PRESSURE IN HPA 830.2 831.5 828.5 831.4 836.0 826.8 825.8 825.5 827.1 833.1 833.8 832.6 836.0 DAY 13 18 1 24 13 3 15 19 30 22 4 5 MIN. QFE PRESSURE IN HPA 814.0 819.0 817.5 817.3 822.0 818.3 813.0 818.0 820.3 823.8 823.0 818.5 813.0 DAY 30 5 24 20 1 20 9 7 2 15 30 1 MEAN QNH PRESSURE IN HPA 1013.7 1015.2 1012.9 1014.2 1016.6 1011.3 1008.5 1010.8 1012.9 1016.7 1018.9 1015.1 1013.9 MAX. QNH PRESSURE IN HPA 1020.1 1021.6 1018.1 1021.5 1026.9 1016.0 1014.9 1014.5 1016.4 1023.5 1024.3 1022.9 1026.9 DAY 13 18 1 24 13 3 15 19 30 22 4 5 MIN. QNH PRESSURE IN HPA 1000.9 1006.8 1005.1 1004.8 1010.4 1006.0 999.7 1005.6 1008.4 1012.5 1011.6 1006.2 999.7 DAY 30 5 24 20 1 20 9 7 2 15 30 1 MEAN QFF PRESSURE IN HPA 1014.1 1014.9 1006.7 1004.8 1004.8 996.3 991.0 993.9 999.6 1007.5 1017.7 1015.0 1005.5 MAX. QFF PRESSURE IN HPA 1020.6 1021.0 1014.5 1014.8 1016.8 1003.0 999.8 999.4 1006.6 1014.5 1030.6 1020.3 1030.6 DAY 12 13 1 24 13 3 15 19 25 22 23 20 MIN. QFF PRESSURE IN HPA 1001.2 1007.3 997.2 992.1 997.7 988.8 983.3 987.6 991.7 1002.3 1008.7 1004.2 983.3 DAY 30 22 24 20 26 20 9 2 2 9 6 9 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 824.0 825.4 823.1 824.2 826.2 821.5 818.9 820.8 822.6 826.2 828.1 825.1 823.8 MAX. QFE PRESSURE IN HPA 829.5 831.0 826.8 830.5 834.8 825.6 824.4 823.8 829.3 832.3 832.1 831.5 834.8 DAY 13 18 28 24 13 2 16 19 20 22 4 5 MIN. QFE PRESSURE IN HPA 814.4 817.5 816.3 817.2 821.0 817.5 812.0 816.7 818.4 821.7 821.8 818.6 812.0 DAY 30 5 24 20 19 20 9 7 4 15 30 1 MEAN QNH PRESSURE IN HPA 1012.8 1014.4 1011.6 1012.9 1015.4 1009.8 1006.7 1008.9 1011.1 1015.3 1017.6 1014.0 1012.6 MAX. QNH PRESSURE IN HPA 1019.2 1021.0 1016.0 1020.4 1025.5 1014.6 1013.2 1012.5 1019.0 1022.5 1022.3 1021.6 1025.5 DAY 13 18 28 24 13 2 16 19 20 22 4 5 MIN. QNH PRESSURE IN HPA 1001.4 1005.1 1003.6 1004.7 1009.2 1005.1 998.6 1004.1 1006.1 1010.0 1010.1 1006.4 998.6 DAY 30 5 24 20 19 20 9 7 4 15 30 1 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1958 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 824.3 825.2 823.1 823.9 826.1 821.3 818.6 820.4 822.5 826.7 828.6 825.4 823.8 MAX. QFE PRESSURE IN HPA 830.2 831.3 826.8 830.0 833.8 826.8 824.0 823.6 826.0 832.7 833.0 832.0 833.8 DAY 13 18 28 24 13 1 15 24 24 22 4 5 MIN. QFE PRESSURE IN HPA 813.0 817.5 817.0 818.0 821.8 817.0 812.0 816.0 818.8 822.4 821.4 820.1 812.0 DAY 31 5 14 20 26 20 9 7 4 15 30 1 MEAN QNH PRESSURE IN HPA 1013.1 1014.2 1011.7 1012.6 1015.2 1009.6 1006.3 1008.5 1010.9 1015.9 1018.2 1014.4 1012.5 MAX. QNH PRESSURE IN HPA 1020.1 1021.4 1016.0 1019.8 1024.3 1016.0 1012.7 1012.3 1015.1 1023.0 1023.4 1022.2 1024.3 DAY 13 18 28 24 13 1 15 24 24 22 4 5 MIN. QNH PRESSURE IN HPA 999.7 1005.1 1004.5 1005.6 1010.1 1004.5 998.6 1003.3 1006.6 1010.8 1009.7 1008.1 998.6 DAY 31 5 14 20 26 20 9 7 4 15 30 1 MEAN QFF PRESSURE IN HPA 1014.4 1015.2 1007.1 1004.4 1005.2 996.2 990.8 993.7 999.6 1008.9 1018.5 1015.1 1005.8 MAX. QFF PRESSURE IN HPA 1022.7 1022.2 1013.1 1014.2 1015.2 1006.0 999.2 998.3 1006.5 1017.0 1030.5 1020.7 1030.5 DAY 19 1 1 24 13 1 15 24 24 22 23 20 MIN. QFF PRESSURE IN HPA 1001.5 1008.4 998.7 995.1 998.7 990.2 984.2 988.6 992.2 1003.6 1008.7 1004.8 984.2 DAY 31 5 14 20 26 30 9 3 2 1 30 9 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 824.7 825.7 823.9 824.7 827.1 822.2 819.7 821.7 823.9 827.6 828.9 825.6 824.6 MAX. QFE PRESSURE IN HPA 831.1 831.5 828.0 830.4 834.4 826.6 825.0 824.5 827.5 833.2 833.8 831.6 834.4 DAY 7 18 27 24 13 2 15 24 24 22 3 5 MIN. QFE PRESSURE IN HPA 815.0 817.5 818.5 819.8 823.4 818.0 812.3 818.0 820.1 824.0 820.6 820.5 812.3 DAY 31 5 14 20 5 20 9 7 3 15 30 1 MEAN QNH PRESSURE IN HPA 1013.6 1014.7 1012.7 1013.6 1016.4 1010.7 1007.6 1010.0 1012.6 1017.0 1018.5 1014.7 1013.5 MAX. QNH PRESSURE IN HPA 1021.1 1021.6 1017.5 1020.3 1025.0 1015.8 1013.9 1013.3 1016.9 1023.6 1024.3 1021.7 1025.0 DAY 7 18 27 24 13 2 15 24 24 22 3 5 MIN. QNH PRESSURE IN HPA 1002.1 1005.1 1006.2 1007.8 1012.0 1005.6 998.9 1005.6 1008.1 1012.7 1008.7 1008.6 998.9 DAY 31 5 14 20 5 20 9 7 3 15 30 1 MEAN QFF PRESSURE IN HPA 1015.1 1016.0 1007.6 1005.4 1006.0 996.7 991.6 995.0 1001.2 1009.8 1018.8 1015.5 1006.5 MAX. QFF PRESSURE IN HPA 1023.5 1022.9 1014.9 1015.2 1015.8 1004.6 1000.4 998.7 1008.2 1018.5 1030.6 1021.8 1030.6 DAY 19 7 1 24 13 1 15 18 24 31 22 19 MIN. QFF PRESSURE IN HPA 1004.9 1008.7 999.4 996.9 1000.0 989.0 984.0 990.2 994.0 1004.9 1008.2 1005.2 984.0 DAY 31 5 14 29 26 30 9 1 2 8 30 8 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 824.7 825.7 823.9 824.7 827.1 822.3 819.9 821.7 824.0 827.8 828.8 825.6 824.7 MAX. QFE PRESSURE IN HPA 831.0 831.5 828.0 830.4 834.3 826.2 825.2 824.6 827.6 833.4 833.8 831.5 834.3 DAY 7 18 27 24 13 1 15 24 30 22 3 5 MIN. QFE PRESSURE IN HPA 816.5 818.0 818.0 819.0 823.6 818.2 812.7 818.0 820.2 824.6 820.0 821.2 812.7 DAY 30 5 23 19 5 30 9 16 3 9 30 1 MEAN QNH PRESSURE IN HPA 1013.6 1014.8 1012.6 1013.5 1016.4 1010.7 1007.9 1010.1 1012.7 1017.2 1018.5 1014.6 1013.5 MAX. QNH PRESSURE IN HPA 1021.0 1021.6 1017.5 1020.3 1024.9 1015.3 1014.2 1013.5 1017.0 1023.9 1024.3 1021.6 1024.9 DAY 7 18 27 24 13 1 15 24 30 22 3 5 MIN. QNH PRESSURE IN HPA 1003.9 1005.6 1005.6 1006.8 1012.3 1005.9 999.4 1005.6 1008.2 1013.5 1008.0 1009.4 999.4 DAY 30 5 23 19 5 30 9 16 3 9 30 1 MEAN QFF PRESSURE IN HPA 1014.0 1014.3 1006.3 1004.2 1004.6 995.9 990.9 993.5 999.6 1008.1 1017.3 1014.6 1005.3 MAX. QFF PRESSURE IN HPA 1022.0 1022.4 1012.2 1013.5 1014.7 1003.2 999.2 998.0 1005.9 1017.4 1029.2 1020.3 1029.2 DAY 19 1 7 24 13 1 15 19 24 31 22 19 MIN. QFF PRESSURE IN HPA 1004.7 1006.1 997.3 995.4 999.3 988.8 983.7 988.0 992.2 1003.6 1006.4 1004.0 983.7 DAY 16 5 14 29 10 30 9 2 2 9 30 8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1959 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 0.6 -3.5 6.3 14.6 17.4 23.9 26.4 27.1 22.2 16.5 5.4 0.8 13.1 MINIMUN AIR TEMPERATURE (C) -3.9 -7.4 1.5 8.4 11.0 15.8 18.0 18.6 13.1 9.3 -0.2 -4.3 6.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 3 6 0 0 0 0 9 DAYS WITH MINIMUM TEMP. <=-4 14 20 5 0 0 0 0 0 0 0 5 12 56 DAYS WITH FREEZING MIN.<= 0 30 27 11 1 0 0 0 0 0 0 14 30 113 TEMPERATURE RECORDS LOWEST(C) -11.0 -20.0 -8.0 0.0 5.0 12.0 12.0 11.0 10.0 4.0 -17.0 -13.0 -20.0 DAY 3 12 8 3 11 3 29 28 24 31 27 4 MAXIMUM AIR TEMPERATURE (C) 6.1 2.3 13.2 23.1 26.3 33.5 36.1 37.1 32.3 24.6 11.9 6.2 21.1 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 7 26 31 31 24 0 0 0 119 DAYS WITH MAXIMUM TEMP. <= 0 5 10 0 0 0 0 0 0 0 0 3 4 22 TEMPERATURE RECORDS HIGHEST(C) 14.0 9.0 23.0 29.0 35.0 38.0 39.0 41.0 38.0 29.0 19.0 12.0 41.0 DAY 19 1 17 22 29 25 31 6 3 1 6 23 DIF. BETWEEN (MAX.-MIN.) (C) 10.0 9.7 11.7 14.7 15.3 17.7 18.1 18.5 19.2 15.3 12.1 10.5 14.4 MEAN DAILY TEMP. (MDT) (C) 1.1 -2.5 7.4 15.7 18.6 24.7 27.0 27.9 22.7 17.0 5.8 0.9 13.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 18.0 111.5 186.5 212.5 60.5 1.0 0.0 0.0 590.0 HEATING DEG. DAYS(BASE 18 0C) 523.5 575.0 330.0 85.5 30.5 0.0 0.0 0.0 0.0 46.5 365.5 529.5 2486.0 DEWPOINT (MEAN C) -3.8 -7.0 -1.8 3.7 5.4 5.8 7.5 7.6 1.7 0.3 -3.2 -4.2 1.0 MIXING RATIO (G/KG) 3.68 2.92 4.28 6.21 7.05 7.26 8.28 8.31 5.44 4.93 3.82 3.48 5.47 VAPOUR PRESSURE (HPA) 4.84 3.81 5.58 8.10 9.15 9.40 10.66 10.71 7.11 6.51 5.04 4.61 7.12 SATURATION DEF. (HPA) 1.78 1.19 4.61 9.52 11.94 22.06 25.42 27.02 21.52 13.09 4.77 2.11 12.09 RELATIVE HUMIDITY (MEAN %) 76 78 60 51 49 33 32 31 28 37 58 71 50 RELATIVE HUMIDITY (MAX. %) 91 90 81 71 69 48 49 45 40 53 72 83 66 RELATIVE HUMIDITY (MIN. %) 56 61 40 33 30 19 20 19 16 23 44 58 35 RELATIVE HUMIDITY (MEAN% 03UTC) 87 83 74 64 65 47 45 43 38 51 68 76 62 RELATIVE HUMIDITY (MEAN% 09UTC) 70 73 51 42 35 24 24 25 23 29 50 67 43 RELATIVE HUMIDITY (MEAN% 15UTC) 72 77 52 40 39 23 24 22 21 32 55 71 44 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 37.7 37.0 30.9 86.6 43.0 0.0 0.0 3.0 0.0 3.4 44.3 18.0 303.9 DAYS WITH PRECIPITATION >=10 1 1 2 2 1 0 0 0 0 0 1 0 8 DAYS WITH PRECIPITATION >= 5 2 2 2 3 4 0 0 0 0 0 2 2 17 DAYS WITH PRECIPITATION >= 1 5 7 6 8 8 0 0 1 0 2 3 4 44 DAYS WITH PRECIPITATION 6 9 8 9 8 0 0 1 0 3 4 4 52 GREATEST DAILY PRECIPITATION 24.0 21.6 11.0 45.0 14.0 0.0 0.0 3.0 0.0 2.0 35.0 8.0 45.0 DAY 20 8 18 7 10 ** ** 8 ** 19 25 1 DAY WITH THUNDER STORM 0 1 0 2 6 0 1 0 0 0 0 0 10 DAYS WITH SNOW OR SLEET 4 11 3 1 0 0 0 0 0 0 3 2 24 DAYS WITH DUST 0 0 2 2 9 20 23 29 26 7 1 0 119 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 270 270 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 9.9 11.7 12.4 12.6 11.5 11.5 8.2 7.9 6.8 8.4 8.2 8.1 10.7 PREVAILING WIND PERCENT 21.5 35.4 51.0 24.3 20.2 18.8 15.8 11.2 15.2 22.7 8.1 6.0 20.0 CALMS PERCENT OF WIND 75.7 60.1 44.1 68.2 68.8 65.3 71.3 71.0 71.0 71.3 82.8 88.4 69.5 NO. OF WIND OBSERVATION 247 223 247 239 247 239 247 241 210 216 209 216 2781 VECTOR WIND DIRECTION (MEAN) 268 271 271 271 272 267 91 305 273 269 234 239 269 VECTOR WIND MAGNITUDE(KNOTS) 2.0 4.1 6.3 3.0 2.5 2.2 1.3 0.1 0.6 2.0 0.4 0.5 1.9 WIND STEADINESES (MEAN %) 87.0 91.1 94.0 81.1 73.5 57.9 56.5 4.3 31.6 87.0 30.8 55.6 65.5 WIND SPEED (MEAN KNOTS) 2.3 4.5 6.7 3.7 3.4 3.8 2.3 2.3 1.9 2.3 1.3 0.9 2.9 FASTEST WIND DIRECTION 270 270 270 270 220 240 90 240 270 280 180 270 240 FASTEST WIND SPEED (KNOTS) 20 25 35 35 25 30 15 40 10 25 15 15 40 DAY 31 20 14 5 1 1 15 10 5 12 19 22 DAYS WITH SKY CLEAR (0-2)/8 11 9 3 13 8 23 29 30 30 21 10 15 202 DAYS WITH P.CLOUDY (3-6)/8 9 9 12 4 15 4 1 1 0 8 13 12 88 DAYS WITH CLOUDY (7-8)/8 11 10 16 13 8 1 1 0 0 2 7 4 73 DAYS WITH VISIBILITY =< 2 KM 5 8 4 0 0 4 2 0 0 0 2 3 28 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1959 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 822.5 816.3 816.7 820.0 816.6 815.1 812.8 812.5 820.1 827.1 826.8 828.5 819.6 MAX. QFE PRESSURE IN HPA 835.0 824.8 821.0 833.5 821.7 820.2 817.4 819.2 828.2 835.2 832.5 833.5 835.2 DAY-HOUR 30- 3 2-18 11- 6 5- 0 1- 0 12- 9 15- 6 29- 6 24- 6 20-18 3- 6 16- 6 MIN. QFE PRESSURE IN HPA 813.3 805.5 810.3 809.0 810.0 806.8 808.4 808.0 812.5 820.7 818.0 822.8 805.5 DAY-HOUR 19-15 25-12 1- 0 6-12 31-12 28-15 26-15 10-15 2-15 6-12 25-12 12- 3 MEAN QNH PRESSURE IN HPA 1010.9 1003.6 1004.1 1008.0 1003.9 1002.3 999.4 999.1 1008.1 1016.4 1016.0 1018.1 1007.5 MAX. QNH PRESSURE IN HPA 1025.7 1013.7 1009.2 1024.0 1010.0 1008.2 1004.9 1007.1 1017.7 1026.0 1022.8 1024.0 1026.0 DAY-HOUR 30- 3 2-18 11- 6 5- 0 1- 0 12- 9 15- 6 29- 6 24- 6 20-18 3- 6 16- 6 MIN. QNH PRESSURE IN HPA 1000.1 990.9 996.5 995.0 996.2 992.4 994.3 993.8 999.1 1008.8 1005.6 1011.3 990.9 DAY-HOUR 19-15 25-12 1- 0 6-12 31-12 28-15 26-15 10-15 2-15 6-12 25-12 12- 3 MEAN QFF PRESSURE IN HPA 1013.0 1008.5 1001.6 999.7 993.4 987.5 982.9 982.2 996.0 1007.9 1015.4 1021.1 1000.8 MAX. QFF PRESSURE IN HPA 1026.4 1022.8 1013.0 1018.7 1000.7 995.0 988.5 993.7 1009.1 1019.2 1031.4 1033.0 1033.0 DAY-HOUR 30- 3 10-18 9- 6 5- 0 4- 6 12- 9 16- 3 29- 6 24- 6 20-18 27- 6 15- 6 MIN. QFF PRESSURE IN HPA 999.0 992.1 992.4 988.1 983.0 975.4 976.4 974.6 983.3 997.6 1005.7 1011.8 974.6 DAY-HOUR 19-15 25-12 17-12 6-12 31-12 27-21 26-12 10-12 5- 9 12- 9 25- 9 20- 9 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 822.3 816.2 816.5 820.4 816.7 815.1 812.7 811.7 ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 826.8 824.6 820.0 833.5 821.7 819.6 816.0 813.6 ****** ****** ****** ****** ****** DAY 3 3 15 5 1 13 16 24 ** ** ** ** MIN. QFE PRESSURE IN HPA 816.0 807.8 810.3 812.5 811.8 807.9 810.0 809.8 ****** ****** ****** ****** ****** DAY 23 20 1 6 19 28 26 10 ** ** ** ** MEAN QNH PRESSURE IN HPA 1010.8 1003.6 1003.9 1008.4 1004.1 1002.2 999.4 998.2 ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1016.0 1013.5 1008.0 1024.0 1010.0 1007.5 1003.3 1000.4 ****** ****** ****** ****** ****** DAY 3 3 15 5 1 13 16 24 ** ** ** ** MIN. QNH PRESSURE IN HPA 1003.3 993.6 996.5 999.1 998.3 993.7 996.2 996.0 ****** ****** ****** ****** ****** DAY 23 20 1 6 19 28 26 10 ** ** ** ** MEAN QFF PRESSURE IN HPA 1012.2 1007.7 1001.0 999.6 993.2 987.1 982.3 980.0 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1022.5 1019.3 1011.4 1018.7 999.9 993.0 987.2 983.0 ****** ****** ****** ****** ****** DAY 3 11 9 5 5 13 16 21 ** ** ** ** MIN. QFF PRESSURE IN HPA 1002.4 993.8 994.2 992.1 985.2 975.5 978.1 976.2 ****** ****** ****** ****** ****** DAY 20 20 23 6 31 28 26 10 ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 822.9 816.3 816.8 820.0 816.9 815.5 813.1 812.9 820.7 827.3 827.1 828.3 819.8 MAX. QFE PRESSURE IN HPA 835.0 824.3 820.3 825.4 821.0 819.7 816.2 818.3 826.8 834.0 831.9 832.1 835.0 DAY 30 3 11 9 1 13 16 29 25 26 3 16 MIN. QFE PRESSURE IN HPA 816.5 807.1 811.0 812.5 812.0 808.2 810.3 809.8 813.9 822.5 819.9 822.8 807.1 DAY 23 20 1 6 19 28 26 10 6 12 25 12 MEAN QNH PRESSURE IN HPA 1011.5 1003.6 1004.2 1008.0 1004.3 1002.7 999.8 999.6 1008.9 1016.7 1016.4 1017.9 1007.8 MAX. QNH PRESSURE IN HPA 1025.7 1013.1 1008.4 1014.4 1009.2 1007.7 1003.5 1006.0 1016.0 1024.6 1022.1 1022.3 1025.7 DAY 30 3 11 9 1 13 16 29 25 26 3 16 MIN. QNH PRESSURE IN HPA 1003.9 992.8 997.4 999.1 998.6 994.1 996.5 996.0 1000.8 1011.0 1007.9 1011.3 992.8 DAY 23 20 1 6 19 28 26 10 6 12 25 12 MEAN QFF PRESSURE IN HPA 1014.1 1009.1 1002.4 1000.1 994.7 989.3 984.4 983.9 997.0 1008.7 1016.1 1021.1 1001.7 MAX. QFF PRESSURE IN HPA 1026.4 1020.1 1012.7 1010.6 1000.6 995.0 988.5 992.8 1006.4 1017.9 1028.1 1031.5 1031.5 DAY 30 11 9 8 11 13 16 29 25 21 27 15 MIN. QFF PRESSURE IN HPA 1005.3 994.0 993.6 992.3 987.0 977.9 980.3 977.9 986.9 1001.0 1006.8 1012.2 977.9 DAY 20 20 22 6 31 28 26 10 6 4 25 12 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1959 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 823.2 816.9 817.3 820.7 817.4 816.0 813.8 813.7 821.4 828.2 827.9 829.7 820.5 MAX. QFE PRESSURE IN HPA 827.1 824.8 821.0 826.2 821.2 820.0 817.4 819.2 828.2 834.9 832.5 833.5 834.9 DAY 3 3 11 8 5 12 15 29 24 26 3 16 MIN. QFE PRESSURE IN HPA 817.5 807.4 811.6 812.0 812.0 807.4 811.0 810.4 813.3 822.8 819.6 824.8 807.4 DAY 23 20 1 6 19 28 26 10 9 12 25 12 MEAN QNH PRESSURE IN HPA 1011.8 1004.4 1004.9 1008.8 1004.9 1003.3 1000.7 1000.5 1009.7 1017.7 1017.4 1019.5 1008.6 MAX. QNH PRESSURE IN HPA 1016.4 1013.7 1009.2 1015.3 1009.4 1008.0 1004.9 1007.1 1017.7 1025.6 1022.8 1024.0 1025.6 DAY 3 3 11 8 5 12 15 29 24 26 3 16 MIN. QNH PRESSURE IN HPA 1005.1 993.1 998.1 998.6 998.6 993.1 997.4 996.7 1000.1 1011.3 1007.5 1013.7 993.1 DAY 23 20 1 6 19 28 26 10 9 12 25 12 MEAN QFF PRESSURE IN HPA 1014.5 1009.8 1003.1 1001.0 994.6 988.7 984.5 984.5 997.8 1009.5 1017.2 1022.7 1002.3 MAX. QFF PRESSURE IN HPA 1025.1 1020.9 1013.0 1012.3 1000.7 994.9 988.3 993.7 1009.1 1018.7 1031.4 1033.0 1033.0 DAY 3 10 9 8 4 13 15 29 24 20 27 15 MIN. QFF PRESSURE IN HPA 1005.6 994.7 993.5 992.2 986.9 976.1 980.3 978.9 986.9 999.8 1006.7 1015.6 976.1 DAY 20 20 31 6 31 28 26 10 9 4 25 20 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 822.7 816.7 817.1 820.4 816.9 815.5 813.4 813.0 820.5 827.1 826.8 828.9 819.9 MAX. QFE PRESSURE IN HPA 825.8 824.0 820.9 826.3 820.3 820.2 817.3 818.5 827.0 834.4 831.3 833.0 834.4 DAY 3 3 21 8 1 12 15 29 19 20 3 16 MIN. QFE PRESSURE IN HPA 817.5 806.6 811.3 810.0 811.0 807.8 810.8 809.4 813.6 821.2 818.2 823.7 806.6 DAY 23 20 1 6 31 28 26 10 5 12 25 20 MEAN QNH PRESSURE IN HPA 1011.2 1004.1 1004.6 1008.5 1004.3 1002.7 1000.2 999.7 1008.7 1016.4 1016.0 1018.5 1007.9 MAX. QNH PRESSURE IN HPA 1014.9 1012.7 1009.1 1015.5 1008.4 1008.2 1004.8 1006.2 1016.3 1025.0 1021.4 1023.4 1025.0 DAY 3 3 21 8 1 12 15 29 19 20 3 16 MIN. QNH PRESSURE IN HPA 1005.1 992.2 997.7 996.2 997.4 993.6 997.1 995.5 1000.4 1009.4 1005.9 1012.4 992.2 DAY 23 20 1 6 31 28 26 10 5 12 25 20 MEAN QFF PRESSURE IN HPA 1012.9 1008.4 1001.7 999.9 992.8 987.2 982.9 982.0 995.0 1006.2 1014.0 1020.6 1000.3 MAX. QFF PRESSURE IN HPA 1022.3 1020.0 1010.9 1010.1 998.5 995.0 987.5 990.4 1005.7 1016.5 1027.5 1029.9 1029.9 DAY 3 10 9 8 4 12 15 29 24 20 27 15 MIN. QFF PRESSURE IN HPA 1005.3 993.2 994.6 989.0 983.6 975.5 979.0 975.3 983.3 997.6 1005.7 1011.8 975.3 DAY 20 20 23 6 31 28 26 10 5 12 25 20 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 821.9 815.8 815.8 819.7 815.8 814.5 812.3 811.7 818.8 825.9 825.8 827.7 818.8 MAX. QFE PRESSURE IN HPA 825.0 823.0 819.5 832.2 820.2 819.0 816.2 816.5 825.5 833.2 830.5 831.6 833.2 DAY 2 2 11 11 1 12 15 29 30 20 3 16 MIN. QFE PRESSURE IN HPA 816.8 805.5 810.7 809.0 810.0 807.0 808.8 808.4 812.8 820.7 818.0 823.9 805.5 DAY 22 25 1 6 31 28 26 10 5 6 25 11 MEAN QNH PRESSURE IN HPA 1010.2 1003.0 1003.1 1007.7 1003.0 1001.5 998.9 998.2 1006.6 1015.0 1014.8 1017.1 1006.6 MAX. QNH PRESSURE IN HPA 1013.9 1011.6 1007.4 1022.4 1008.2 1006.8 1003.5 1003.9 1014.5 1023.6 1020.4 1021.7 1023.6 DAY 2 2 11 11 1 12 15 29 30 20 3 16 MIN. QNH PRESSURE IN HPA 1004.2 990.9 997.0 995.0 996.2 992.6 994.8 994.3 999.5 1008.8 1005.6 1012.6 990.9 DAY 22 25 1 6 31 28 26 10 5 6 25 11 MEAN QFF PRESSURE IN HPA 1011.4 1007.1 1000.0 998.7 992.0 986.1 981.6 978.9 ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1019.8 1017.1 1009.3 1015.0 999.4 992.2 987.3 983.6 ****** ****** ****** ****** ****** DAY 3 10 9 11 1 12 16 24 ** ** ** ** MIN. QFF PRESSURE IN HPA 1003.0 992.1 992.4 988.1 983.0 975.5 976.4 974.6 ****** ****** ****** ****** ****** DAY 19 25 17 6 31 28 26 10 ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1959 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 821.9 815.8 816.2 819.3 815.6 814.2 811.8 811.4 819.1 826.3 826.3 828.3 818.8 MAX. QFE PRESSURE IN HPA 825.8 821.6 819.5 825.3 819.8 818.8 816.0 816.0 825.4 834.3 830.3 832.4 834.3 DAY 2 3 10 8 4 12 15 29 24 20 22 16 MIN. QFE PRESSURE IN HPA 813.3 808.0 811.6 810.0 810.0 806.8 808.4 808.0 812.5 821.0 820.6 823.4 806.8 DAY 19 25 1 6 31 28 26 10 2 6 24 11 MEAN QNH PRESSURE IN HPA 1010.2 1003.0 1003.5 1007.1 1002.9 1001.1 998.3 997.8 1006.9 1015.5 1015.5 1017.8 1006.6 MAX. QNH PRESSURE IN HPA 1014.9 1009.9 1007.4 1014.3 1007.8 1006.6 1003.3 1003.3 1014.4 1024.9 1020.2 1022.7 1024.9 DAY 2 3 10 8 4 12 15 29 24 20 22 16 MIN. QNH PRESSURE IN HPA 1000.1 993.8 998.1 996.2 996.2 992.4 994.3 993.8 999.1 1009.2 1008.7 1012.0 992.4 DAY 19 25 1 6 31 28 26 10 2 6 24 11 MEAN QFF PRESSURE IN HPA 1012.6 1008.4 1001.4 999.0 993.2 987.6 982.7 982.0 995.0 1007.6 1015.2 1020.8 1000.5 MAX. QFF PRESSURE IN HPA 1022.4 1021.6 1010.6 1009.5 999.8 994.4 988.3 989.5 1005.0 1018.4 1028.0 1030.6 1030.6 DAY 2 10 8 8 4 12 15 28 24 20 27 14 MIN. QFF PRESSURE IN HPA 999.0 997.3 994.3 990.6 984.6 976.4 978.3 976.1 983.6 1000.7 1007.9 1013.4 976.1 DAY 19 25 22 6 31 28 26 9 2 4 13 20 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 822.4 816.1 816.8 819.7 816.5 815.1 812.4 812.4 819.9 827.4 826.9 828.5 819.5 MAX. QFE PRESSURE IN HPA 827.0 824.8 820.0 826.0 820.8 819.7 816.2 817.4 826.4 835.2 831.0 832.2 835.2 DAY 2 2 10 8 4 12 15 29 24 20 3 16 MIN. QFE PRESSURE IN HPA 816.5 809.3 813.0 813.0 811.5 808.0 809.8 809.4 813.6 822.6 820.5 823.0 808.0 DAY 22 6 26 2 31 27 25 9 5 30 24 11 MEAN QNH PRESSURE IN HPA 1010.9 1003.4 1004.2 1007.7 1003.9 1002.2 999.1 999.1 1007.9 1016.8 1016.2 1018.0 1007.4 MAX. QNH PRESSURE IN HPA 1016.3 1013.7 1008.0 1015.1 1009.0 1007.7 1003.5 1004.9 1015.6 1026.0 1021.0 1022.4 1026.0 DAY 2 2 10 8 4 12 15 29 24 20 3 16 MIN. QNH PRESSURE IN HPA 1003.9 995.4 999.7 999.7 998.0 993.8 996.0 995.5 1000.4 1011.1 1008.6 1011.6 993.8 DAY 22 6 26 2 31 27 25 9 5 30 24 11 MEAN QFF PRESSURE IN HPA 1013.4 1009.0 1002.3 999.8 993.6 987.5 982.8 983.1 996.1 1008.7 1016.1 1021.1 1001.1 MAX. QFF PRESSURE IN HPA 1024.2 1022.8 1011.2 1011.1 1000.1 994.2 988.0 990.9 1006.0 1019.2 1028.4 1030.6 1030.6 DAY 2 10 8 8 4 12 15 29 25 20 27 14 MIN. QFF PRESSURE IN HPA 1004.3 996.7 993.6 991.1 985.4 977.2 979.6 977.2 985.7 1000.6 1007.4 1013.9 977.2 DAY 19 6 31 22 31 27 22 9 4 12 24 11 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 822.5 816.6 816.9 820.0 816.8 815.3 812.7 812.8 820.4 827.4 826.8 828.5 819.7 MAX. QFE PRESSURE IN HPA 826.8 824.8 820.0 826.2 820.9 819.8 816.5 818.0 826.4 835.0 831.0 832.0 835.0 DAY 2 2 14 8 4 12 15 28 26 20 2 16 MIN. QFE PRESSURE IN HPA 816.2 809.0 813.0 812.5 812.0 807.8 810.0 809.8 813.9 822.4 820.5 823.0 807.8 DAY 22 19 26 5 18 27 25 9 5 30 24 11 MEAN QNH PRESSURE IN HPA 1011.0 1003.9 1004.4 1008.0 1004.2 1002.5 999.4 999.5 1008.5 1016.7 1016.0 1018.0 1007.7 MAX. QNH PRESSURE IN HPA 1016.0 1013.7 1008.0 1015.3 1009.1 1007.8 1003.9 1005.6 1015.6 1025.7 1021.0 1022.2 1025.7 DAY 2 2 14 8 4 12 15 28 26 20 2 16 MIN. QNH PRESSURE IN HPA 1003.5 995.0 999.7 999.1 998.6 993.6 996.2 996.0 1000.8 1010.8 1008.6 1011.6 993.6 DAY 22 19 26 5 18 27 25 9 5 30 24 11 MEAN QFF PRESSURE IN HPA 1012.7 1008.5 1001.4 999.3 993.0 987.0 982.2 981.9 995.1 1006.8 1014.0 1020.2 1000.2 MAX. QFF PRESSURE IN HPA 1022.9 1020.5 1010.2 1010.3 998.9 995.0 987.7 990.5 1004.3 1017.1 1027.8 1030.3 1030.3 DAY 2 10 8 7 4 12 15 28 24 20 27 14 MIN. QFF PRESSURE IN HPA 1002.3 995.3 993.7 991.3 985.4 975.4 978.0 976.1 984.1 999.0 1005.8 1011.9 975.4 DAY 19 19 17 5 29 27 25 9 5 12 24 20 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1960 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 2.9 6.4 5.2 11.0 20.0 25.5 26.3 26.8 21.6 14.2 7.5 1.8 14.1 MINIMUN AIR TEMPERATURE (C) -1.9 0.5 0.3 5.8 11.5 15.4 17.5 17.4 13.6 7.2 3.5 -1.6 7.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 1 0 0 0 0 0 1 DAYS WITH MINIMUM TEMP. <=-4 4 4 4 0 0 0 0 0 0 0 0 4 16 DAYS WITH FREEZING MIN.<= 0 20 17 17 0 0 0 0 0 0 0 4 30 88 TEMPERATURE RECORDS LOWEST(C) -20.0 -6.0 -10.0 2.0 5.0 11.0 13.0 14.0 10.0 4.0 -1.0 -5.0 -20.0 DAY 30 1 14 11 1 5 10 20 23 23 29 25 MAXIMUM AIR TEMPERATURE (C) 9.1 12.5 11.4 17.6 28.3 34.3 35.1 35.8 31.4 24.5 13.7 7.1 21.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 13 30 31 31 27 0 0 0 132 DAYS WITH MAXIMUM TEMP. <= 0 3 0 1 0 0 0 0 0 0 0 0 2 6 TEMPERATURE RECORDS HIGHEST(C) 16.0 20.0 18.0 23.0 33.0 40.0 40.0 39.0 34.0 29.0 23.0 14.0 40.0 DAY 16 28 5 24 29 26 7 12 1 1 1 1 DIF. BETWEEN (MAX.-MIN.) (C) 11.0 12.0 11.1 11.8 16.8 18.9 17.6 18.4 17.8 17.3 10.2 8.7 14.3 MEAN DAILY TEMP. (MDT) (C) 3.6 6.5 5.8 11.7 19.9 24.8 26.3 26.6 22.5 15.8 8.6 2.7 14.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 21.0 115.5 164.5 174.0 48.0 0.0 0.0 0.0 523.0 HEATING DEG. DAYS(BASE 18 0C) 447.5 334.0 378.0 189.0 16.0 0.0 0.0 0.0 0.0 74.0 281.0 473.0 2192.5 DEWPOINT (MEAN C) -3.4 -2.6 -3.3 2.3 4.0 6.1 9.2 5.4 3.9 0.6 1.1 -3.1 1.7 MIXING RATIO (G/KG) 3.75 3.93 3.77 5.63 6.38 7.36 9.11 7.10 6.30 4.90 5.19 3.72 5.60 VAPOUR PRESSURE (HPA) 4.95 5.18 4.95 7.38 8.38 9.61 11.84 9.25 8.27 6.47 6.85 4.92 7.34 SATURATION DEF. (HPA) 3.18 5.02 4.44 6.38 16.25 24.81 23.95 27.68 18.89 10.69 3.87 2.26 12.29 RELATIVE HUMIDITY (MEAN %) 66 57 60 59 38 31 36 27 33 41 67 72 49 RELATIVE HUMIDITY (MAX. %) 78 73 77 78 58 48 53 40 47 55 81 85 64 RELATIVE HUMIDITY (MIN. %) 54 42 42 41 23 18 25 18 22 27 52 54 35 RELATIVE HUMIDITY (MEAN% 03UTC) 71 69 73 74 57 47 52 40 46 52 76 78 61 RELATIVE HUMIDITY (MEAN% 09UTC) 61 51 50 51 28 25 31 22 27 30 61 66 42 RELATIVE HUMIDITY (MEAN% 15UTC) 65 52 56 53 28 23 29 20 26 35 63 69 43 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 84.5 32.0 144.0 104.2 1.0 0.0 10.0 0.0 0.0 0.0 53.0 10.0 438.7 DAYS WITH PRECIPITATION >=10 2 2 4 4 0 0 0 0 0 0 1 0 13 DAYS WITH PRECIPITATION >= 5 2 2 6 6 0 0 1 0 0 0 5 1 23 DAYS WITH PRECIPITATION >= 1 5 6 12 14 1 0 2 0 0 0 12 3 55 DAYS WITH PRECIPITATION 6 6 12 16 1 0 2 0 0 0 12 3 58 GREATEST DAILY PRECIPITATION 61.0 13.0 43.0 28.0 1.0 0.0 6.0 0.0 0.0 0.0 13.0 8.0 61.0 DAY 27 11 18 10 1 ** 25 ** ** ** 19 19 DAY WITH THUNDER STORM 0 0 0 2 2 0 1 0 0 0 0 0 5 DAYS WITH SNOW OR SLEET 3 2 7 1 0 0 0 0 0 0 0 1 14 DAYS WITH DUST 0 0 2 10 14 8 19 25 13 3 0 0 94 WIND DIRECTION (PREVAILING) 225 225 225 225 225 225 45 45 45 225 225 225 225 PREVAILING WIND SPEED(KNOTS) 11.9 9.6 10.1 11.7 8.6 8.1 7.3 8.0 7.5 8.4 7.9 9.3 9.5 PREVAILING WIND PERCENT 15.3 28.9 26.9 20.5 15.3 12.9 9.2 11.6 7.2 7.3 10.9 5.3 13.5 CALMS PERCENT OF WIND 69.9 65.2 62.0 61.4 63.0 68.4 71.6 64.8 76.6 86.3 79.9 94.3 72.5 NO. OF WIND OBSERVATION 216 201 216 210 216 209 218 216 222 248 239 245 2656 VECTOR WIND DIRECTION (MEAN) 227 229 238 238 253 229 87 321 67 219 244 233 235 VECTOR WIND MAGNITUDE(KNOTS) 2.3 3.2 3.3 3.1 0.9 0.6 0.3 0.2 0.1 0.4 1.0 0.5 1.2 WIND STEADINESES (MEAN %) 76.7 97.0 86.8 72.1 29.0 25.0 13.6 7.4 6.3 36.4 62.5 100.0 48.0 WIND SPEED (MEAN KNOTS) 3.0 3.3 3.8 4.3 3.1 2.4 2.2 2.7 1.6 1.1 1.6 0.5 2.5 FASTEST WIND DIRECTION 240 220 240 220 120 240 90 230 40 240 180 240 240 FASTEST WIND SPEED (KNOTS) 25 20 20 25 15 15 15 15 13 15 15 15 25 DAY 17 26 2 1 10 14 19 24 3 7 4 2 DAYS WITH SKY CLEAR (0-2)/8 15 9 7 5 19 30 26 27 29 28 12 16 223 DAYS WITH P.CLOUDY (3-6)/8 13 10 8 10 10 0 5 4 1 3 8 6 78 DAYS WITH CLOUDY (7-8)/8 3 10 16 15 2 0 0 0 0 0 10 9 65 DAYS WITH VISIBILITY =< 2 KM 3 0 2 2 1 0 0 0 0 0 0 1 9 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1960 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 826.2 825.6 821.3 823.2 825.4 821.8 819.9 820.3 825.2 828.4 827.7 827.8 824.4 MAX. QFE PRESSURE IN HPA 833.0 839.8 829.6 832.1 830.2 832.5 826.4 825.5 833.3 833.9 836.6 833.9 839.8 DAY-HOUR 19- 6 2- 3 31-18 7- 6 5- 6 1- 3 29- 6 31- 6 28-18 28- 6 3-18 6- 6 MIN. QFE PRESSURE IN HPA 816.2 816.2 811.5 817.6 819.9 815.1 812.8 816.3 820.0 822.6 817.3 818.5 811.5 DAY-HOUR 7-12 29-15 11-21 19-12 30-15 29-15 8-15 11-15 4-12 7-15 19-15 27- 3 MEAN QNH PRESSURE IN HPA 1015.3 1014.7 1009.6 1011.8 1014.4 1010.2 1007.9 1008.3 1014.2 1017.9 1017.1 1017.2 1013.2 MAX. QNH PRESSURE IN HPA 1023.4 1031.4 1019.4 1022.3 1020.1 1022.8 1015.6 1014.5 1023.7 1024.4 1027.6 1024.4 1031.4 DAY-HOUR 19- 6 2- 3 31-18 7- 6 5- 6 1- 3 29- 6 31- 6 28-18 28- 6 3-18 6- 6 MIN. QNH PRESSURE IN HPA 1003.5 1003.5 998.0 1005.2 1007.9 1002.2 999.5 1003.6 1008.0 1011.1 1004.8 1006.2 998.0 DAY-HOUR 7-12 29-15 11-21 19-12 30-15 29-15 8-15 11-15 4-12 7-15 19-15 27- 3 MEAN QFF PRESSURE IN HPA 1016.5 1013.3 1008.8 1006.6 1003.6 995.6 992.5 993.0 1001.9 1010.2 1014.0 1018.5 1006.2 MAX. QFF PRESSURE IN HPA 1031.4 1036.1 1022.2 1018.4 1013.7 1011.4 1000.8 1001.0 1012.8 1019.3 1021.8 1026.9 1036.1 DAY-HOUR 29- 6 2- 3 20- 6 7-18 1- 6 1- 3 30- 3 31- 6 28-18 31- 6 3-18 9- 6 MIN. QFF PRESSURE IN HPA 1005.4 996.6 994.1 997.8 994.2 985.5 982.8 987.6 994.2 1000.6 1000.5 1007.4 982.8 DAY-HOUR 7-15 29-15 11-21 19-18 30-21 29-21 8- 9 11-15 4- 9 7-12 19-12 1-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 828.6 827.9 827.7 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 832.7 831.8 833.0 ****** DAY ** ** ** ** ** ** ** ** ** 31 4 6 MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 823.8 818.2 822.1 ****** DAY ** ** ** ** ** ** ** ** ** 8 20 30 MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1018.2 1017.3 1017.2 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1023.0 1022.0 1023.4 ****** DAY ** ** ** ** ** ** ** ** ** 31 4 6 MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1012.5 1005.9 1010.5 ****** DAY ** ** ** ** ** ** ** ** ** 8 20 30 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1009.6 1013.4 1017.5 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1015.2 1019.7 1024.1 ****** DAY ** ** ** ** ** ** ** ** ** 31 12 6 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1002.1 1003.1 1008.6 ****** DAY ** ** ** ** ** ** ** ** ** 8 20 1 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 826.2 826.1 821.4 823.3 826.0 823.1 820.9 821.3 825.9 828.8 827.9 827.5 824.9 MAX. QFE PRESSURE IN HPA 832.0 839.8 828.5 830.1 829.1 832.5 825.7 824.8 828.6 832.8 831.8 833.0 839.8 DAY 19 2 20 8 8 1 17 31 26 28 26 6 MIN. QFE PRESSURE IN HPA 818.5 820.0 812.0 818.4 821.2 817.4 816.0 818.7 822.2 824.3 818.7 818.5 812.0 DAY 7 29 12 19 31 30 8 27 4 8 20 27 MEAN QNH PRESSURE IN HPA 1015.3 1015.2 1009.6 1011.9 1015.1 1011.7 1009.1 1009.5 1014.9 1018.4 1017.4 1016.9 1013.8 MAX. QNH PRESSURE IN HPA 1022.2 1031.4 1018.1 1019.9 1018.8 1022.8 1014.8 1013.7 1018.2 1023.1 1022.0 1023.4 1031.4 DAY 19 2 20 8 8 1 17 31 26 28 26 6 MIN. QNH PRESSURE IN HPA 1006.2 1008.0 998.6 1006.1 1009.4 1004.9 1003.3 1006.5 1010.6 1013.1 1006.5 1006.2 998.6 DAY 7 29 12 19 31 30 8 27 4 8 20 27 MEAN QFF PRESSURE IN HPA 1016.5 1014.1 1009.0 1006.9 1005.0 998.1 994.4 994.9 1003.5 1011.9 1014.8 1018.5 1007.3 MAX. QFF PRESSURE IN HPA 1029.4 1036.1 1021.0 1014.6 1012.9 1011.4 1000.8 1000.7 1007.8 1017.8 1020.3 1025.5 1036.1 DAY 29 2 20 7 1 1 30 30 26 28 12 6 MIN. QFF PRESSURE IN HPA 1006.4 1001.0 995.9 998.6 997.6 989.4 986.5 990.6 998.0 1004.6 1003.7 1009.5 986.5 DAY 7 29 12 19 31 30 8 12 4 8 20 19 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1960 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 827.2 826.6 822.3 824.1 826.6 823.3 821.2 821.8 826.5 829.8 828.9 829.1 825.6 MAX. QFE PRESSURE IN HPA 833.0 832.0 829.2 832.1 830.2 827.7 826.4 825.5 829.2 833.9 833.0 833.9 833.9 DAY 19 15 20 7 5 3 29 31 26 28 26 6 MIN. QFE PRESSURE IN HPA 818.4 820.1 813.5 819.2 821.9 817.9 816.0 818.6 822.6 825.5 821.5 823.3 813.5 DAY 7 22 12 19 31 30 8 27 4 8 19 30 MEAN QNH PRESSURE IN HPA 1016.5 1015.9 1010.7 1012.9 1015.9 1011.9 1009.5 1010.1 1015.7 1019.5 1018.5 1018.8 1014.7 MAX. QNH PRESSURE IN HPA 1023.4 1022.2 1018.9 1022.3 1020.1 1017.1 1015.6 1014.5 1018.9 1024.4 1023.4 1024.4 1024.4 DAY 19 15 20 7 5 3 29 31 26 28 26 6 MIN. QNH PRESSURE IN HPA 1006.1 1008.1 1000.3 1007.1 1010.3 1005.5 1003.3 1006.4 1011.1 1014.5 1009.8 1011.9 1000.3 DAY 7 22 12 19 31 30 8 27 4 8 19 30 MEAN QFF PRESSURE IN HPA 1018.1 1014.9 1010.2 1007.9 1005.0 997.0 993.9 994.7 1003.8 1012.7 1016.0 1020.9 1007.9 MAX. QFF PRESSURE IN HPA 1031.4 1024.5 1022.2 1017.4 1013.7 1004.5 1000.0 1001.0 1008.4 1019.3 1021.5 1026.9 1031.4 DAY 29 14 20 7 1 2 29 31 26 31 16 9 MIN. QFF PRESSURE IN HPA 1007.2 1001.6 998.5 998.8 997.0 989.7 986.1 990.2 997.7 1005.1 1004.6 1013.6 986.1 DAY 7 29 12 19 30 30 8 12 4 7 19 19 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 826.3 826.0 821.7 823.6 825.8 822.3 820.2 820.7 825.4 828.9 828.0 828.2 824.7 MAX. QFE PRESSURE IN HPA 831.9 831.3 827.7 831.6 829.3 827.4 825.4 825.0 828.0 833.0 832.1 833.5 833.5 DAY 19 15 30 7 5 2 29 31 26 30 26 6 MIN. QFE PRESSURE IN HPA 817.6 819.1 813.6 818.5 821.1 817.3 814.3 817.8 821.5 824.6 821.0 822.8 813.6 DAY 7 29 12 19 31 30 8 27 4 7 19 30 MEAN QNH PRESSURE IN HPA 1015.4 1015.1 1010.0 1012.3 1014.9 1010.7 1008.3 1008.8 1014.4 1018.5 1017.5 1017.7 1013.6 MAX. QNH PRESSURE IN HPA 1022.1 1021.4 1017.1 1021.7 1019.0 1016.8 1014.4 1013.9 1017.5 1023.4 1022.3 1024.0 1024.0 DAY 19 15 30 7 5 2 29 31 26 30 26 6 MIN. QNH PRESSURE IN HPA 1005.2 1006.9 1000.4 1006.2 1009.3 1004.8 1001.3 1005.4 1009.8 1013.5 1009.2 1011.3 1000.4 DAY 7 29 12 19 31 30 8 27 4 7 19 30 MEAN QFF PRESSURE IN HPA 1015.8 1012.3 1008.4 1006.4 1002.9 994.8 991.5 991.8 1000.6 1009.5 1014.0 1018.9 1005.6 MAX. QFF PRESSURE IN HPA 1030.9 1023.2 1018.5 1015.2 1011.6 1002.8 997.2 998.0 1004.3 1016.1 1020.1 1025.6 1030.9 DAY 29 14 15 7 2 2 30 31 26 31 26 6 MIN. QFF PRESSURE IN HPA 1005.5 1000.3 996.6 997.9 994.5 986.9 982.8 987.8 994.2 1002.2 1005.9 1012.2 982.8 DAY 7 29 11 19 31 30 8 12 4 7 19 30 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 825.2 824.5 820.5 822.5 824.4 820.6 818.8 818.9 823.8 827.0 826.6 826.9 823.3 MAX. QFE PRESSURE IN HPA 830.6 829.6 826.6 829.6 829.1 825.6 824.0 822.8 826.8 831.2 830.6 831.7 831.7 DAY 19 14 20 7 7 2 29 14 12 30 4 6 MIN. QFE PRESSURE IN HPA 816.2 816.4 811.6 817.6 820.0 815.3 813.1 816.5 820.0 822.7 817.8 821.4 811.6 DAY 7 29 11 19 30 30 8 27 4 7 19 29 MEAN QNH PRESSURE IN HPA 1014.2 1013.4 1008.6 1011.0 1013.2 1008.8 1006.6 1006.7 1012.6 1016.3 1015.9 1016.1 1011.9 MAX. QNH PRESSURE IN HPA 1020.5 1019.4 1015.8 1019.4 1018.8 1014.6 1012.7 1011.3 1016.0 1021.3 1020.5 1021.8 1021.8 DAY 19 14 20 7 7 2 29 14 12 30 4 6 MIN. QNH PRESSURE IN HPA 1003.5 1003.8 998.1 1005.2 1008.0 1002.5 999.9 1003.9 1008.0 1011.2 1005.4 1009.7 998.1 DAY 7 29 11 19 30 30 8 27 4 7 19 29 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1007.6 1012.0 1016.4 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1013.5 1017.5 1022.4 ****** DAY ** ** ** ** ** ** ** ** ** 30 26 26 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** 1000.6 1000.5 1007.4 ****** DAY ** ** ** ** ** ** ** ** ** 7 19 1 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1960 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 826.0 825.0 820.8 822.4 824.1 820.3 818.6 818.7 823.8 827.2 826.9 827.2 823.4 MAX. QFE PRESSURE IN HPA 830.7 830.2 826.2 830.6 829.1 825.2 824.0 822.6 826.4 831.3 831.4 832.1 832.1 DAY 19 15 29 7 7 2 29 14 12 30 26 6 MIN. QFE PRESSURE IN HPA 817.5 816.2 811.8 818.0 819.9 815.1 812.8 816.3 820.0 822.6 817.3 820.7 811.8 DAY 7 29 11 18 30 29 8 11 4 7 19 29 MEAN QNH PRESSURE IN HPA 1015.1 1013.9 1009.0 1010.9 1012.9 1008.4 1006.3 1006.4 1012.5 1016.6 1016.1 1016.5 1012.0 MAX. QNH PRESSURE IN HPA 1020.7 1020.1 1015.3 1020.5 1018.8 1014.2 1012.7 1011.1 1015.6 1021.4 1021.5 1022.3 1022.3 DAY 19 15 29 7 7 2 29 14 12 30 26 6 MIN. QNH PRESSURE IN HPA 1005.1 1003.5 998.3 1005.6 1007.9 1002.2 999.5 1003.6 1008.0 1011.1 1004.8 1008.8 998.3 DAY 7 29 11 18 30 29 8 11 4 7 19 29 MEAN QFF PRESSURE IN HPA 1016.2 1012.5 1008.4 1005.9 1002.6 994.6 991.5 991.7 1001.0 1009.9 1013.5 1018.0 1005.5 MAX. QFF PRESSURE IN HPA 1031.1 1022.8 1020.6 1015.8 1011.1 1002.3 998.5 997.3 1005.2 1016.0 1020.2 1024.6 1031.1 DAY 29 1 15 7 1 2 29 30 25 30 26 26 MIN. QFF PRESSURE IN HPA 1005.4 996.6 995.1 998.3 994.9 986.6 982.9 987.6 994.8 1001.6 1000.9 1010.3 982.9 DAY 7 29 11 18 30 29 8 11 1 7 19 19 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 826.2 825.7 821.4 823.2 825.3 821.4 819.6 820.2 825.6 828.4 827.9 827.9 824.4 MAX. QFE PRESSURE IN HPA 831.1 837.9 829.6 832.1 829.4 826.0 825.2 823.8 833.3 832.5 836.6 832.4 837.9 DAY 18 2 31 7 5 2 29 14 28 30 3 5 MIN. QFE PRESSURE IN HPA 818.8 816.8 811.8 818.0 820.8 815.4 815.0 817.6 821.8 823.0 817.5 822.0 811.8 DAY 7 29 11 19 30 29 2 11 1 7 19 29 MEAN QNH PRESSURE IN HPA 1015.4 1014.8 1009.6 1011.8 1014.2 1009.6 1007.6 1008.2 1014.6 1018.0 1017.3 1017.3 1013.2 MAX. QNH PRESSURE IN HPA 1021.1 1029.2 1019.4 1022.3 1019.1 1015.1 1014.2 1012.5 1023.7 1022.8 1027.6 1022.7 1029.2 DAY 18 2 31 7 5 2 29 14 28 30 3 5 MIN. QNH PRESSURE IN HPA 1006.6 1004.2 998.3 1005.6 1009.0 1002.6 1002.1 1005.2 1010.1 1011.6 1005.1 1010.4 998.3 DAY 7 29 11 19 30 29 2 11 1 7 19 29 MEAN QFF PRESSURE IN HPA 1017.0 1013.7 1009.1 1006.8 1003.3 994.8 992.1 992.9 1002.8 1011.1 1014.8 1019.3 1006.5 MAX. QFF PRESSURE IN HPA 1028.9 1031.8 1019.9 1018.4 1012.8 1002.8 999.2 998.8 1012.8 1017.2 1021.8 1025.0 1031.8 DAY 29 2 14 7 1 2 30 29 28 30 3 26 MIN. QFF PRESSURE IN HPA 1008.4 997.5 995.3 997.8 995.9 986.5 984.6 989.1 995.9 1001.5 1001.7 1012.9 984.6 DAY 7 29 11 19 30 29 8 12 1 7 19 19 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 826.1 825.6 821.3 823.3 825.7 821.9 820.1 820.6 825.2 828.6 827.8 828.0 824.5 MAX. QFE PRESSURE IN HPA 831.1 831.0 827.2 832.0 829.6 826.0 825.2 823.8 827.8 832.7 831.2 833.0 833.0 DAY 18 15 29 7 5 2 29 14 11 30 3 5 MIN. QFE PRESSURE IN HPA 820.2 821.0 811.5 818.0 820.6 815.8 815.8 818.3 821.8 824.0 817.8 822.0 811.5 DAY 7 21 11 19 30 29 2 11 10 7 19 29 MEAN QNH PRESSURE IN HPA 1015.3 1014.6 1009.6 1011.9 1014.7 1010.3 1008.1 1008.7 1014.2 1018.2 1017.3 1017.4 1013.4 MAX. QNH PRESSURE IN HPA 1021.1 1021.0 1016.5 1022.2 1019.4 1015.1 1014.2 1012.5 1017.2 1023.0 1021.3 1023.4 1023.4 DAY 18 15 29 7 5 2 29 14 11 30 3 5 MIN. QNH PRESSURE IN HPA 1008.2 1009.2 998.0 1005.6 1008.7 1003.0 1003.0 1006.0 1010.1 1012.7 1005.4 1010.4 998.0 DAY 7 21 11 19 30 29 2 11 10 7 19 29 MEAN QFF PRESSURE IN HPA 1015.6 1012.3 1007.9 1006.0 1002.8 994.6 991.5 991.9 1000.5 1009.3 1013.9 1018.6 1005.4 MAX. QFF PRESSURE IN HPA 1028.9 1022.7 1018.2 1015.3 1011.6 1001.5 998.2 998.0 1004.2 1015.6 1019.3 1024.9 1028.9 DAY 29 1 15 7 1 2 30 29 24 30 15 5 MIN. QFF PRESSURE IN HPA 1005.7 1001.5 994.1 997.8 994.2 985.5 985.1 988.4 995.4 1001.1 1003.5 1012.1 985.1 DAY 23 21 11 19 30 29 8 11 3 7 19 18 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1961 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -1.4 -0.2 5.9 10.2 18.9 23.5 27.2 24.5 21.5 15.2 7.1 3.7 13.0 MINIMUN AIR TEMPERATURE (C) -5.2 -4.3 0.6 5.3 11.7 15.0 18.9 15.7 12.3 6.2 1.5 -1.1 6.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 1 0 0 0 0 0 1 DAYS WITH MINIMUM TEMP. <=-4 19 12 3 0 0 0 0 0 0 0 4 5 43 DAYS WITH FREEZING MIN.<= 0 30 28 15 3 0 0 0 0 0 1 11 23 111 TEMPERATURE RECORDS LOWEST(C) -15.0 -15.0 -5.0 -1.0 7.0 10.0 16.0 13.0 10.0 0.0 -7.0 -5.0 -15.0 DAY 16 5 4 17 1 8 2 16 20 31 25 26 MAXIMUM AIR TEMPERATURE (C) 3.2 5.2 12.7 16.6 27.3 32.4 36.3 33.8 30.6 23.3 13.7 9.5 20.4 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 5 25 31 31 24 1 0 0 117 DAYS WITH MAXIMUM TEMP. <= 0 7 4 0 0 0 0 0 0 0 0 0 0 11 TEMPERATURE RECORDS HIGHEST(C) 7.0 11.0 21.0 27.0 32.0 36.0 39.0 36.0 33.0 30.0 20.0 14.0 39.0 DAY 18 28 24 27 23 20 7 6 5 1 3 6 DIF. BETWEEN (MAX.-MIN.) (C) 8.4 9.5 12.1 11.3 15.6 17.4 17.4 18.1 18.3 17.1 12.2 10.6 14.0 MEAN DAILY TEMP. (MDT) (C) -1.0 0.4 6.7 11.0 19.5 23.7 27.6 24.8 21.4 14.7 7.6 4.2 13.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 6.5 88.0 205.0 117.0 25.0 0.0 0.0 0.0 441.5 HEATING DEG. DAYS(BASE 18 0C) 589.5 491.5 350.5 211.5 13.0 0.5 0.0 0.0 0.0 103.5 311.0 427.0 2498.0 DEWPOINT (MEAN C) -4.9 -4.3 -3.3 3.0 3.5 5.3 8.0 5.6 2.6 -1.5 -2.1 -3.3 0.7 MIXING RATIO (G/KG) 3.35 3.47 3.76 5.93 6.16 6.91 8.38 7.12 5.86 4.23 4.13 3.70 5.25 VAPOUR PRESSURE (HPA) 4.42 4.57 4.94 7.77 8.08 9.04 10.89 9.31 7.67 5.58 5.45 4.87 6.88 SATURATION DEF. (HPA) 1.29 1.69 4.83 5.46 14.92 21.46 26.88 23.13 19.52 12.89 5.09 3.25 11.70 RELATIVE HUMIDITY (MEAN %) 79 76 55 64 39 33 32 32 31 34 54 62 49 RELATIVE HUMIDITY (MAX. %) 91 90 78 83 59 51 45 47 47 48 68 77 65 RELATIVE HUMIDITY (MIN. %) 59 60 34 46 23 20 20 19 18 22 37 47 34 RELATIVE HUMIDITY (MEAN% 03UTC) 84 84 70 79 56 49 45 46 46 47 63 72 62 RELATIVE HUMIDITY (MEAN% 09UTC) 72 68 42 56 30 24 23 24 25 25 46 56 41 RELATIVE HUMIDITY (MEAN% 15UTC) 81 69 43 55 30 24 23 21 21 30 52 59 42 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 84.0 58.2 71.3 205.2 23.2 1.0 0.0 0.0 0.0 0.0 17.5 57.1 517.5 DAYS WITH PRECIPITATION >=10 3 2 3 7 1 0 0 0 0 0 0 2 18 DAYS WITH PRECIPITATION >= 5 5 4 4 10 2 0 0 0 0 0 2 4 31 DAYS WITH PRECIPITATION >= 1 10 8 5 13 3 1 0 0 0 0 4 9 53 DAYS WITH PRECIPITATION 10 9 6 14 4 1 0 0 0 0 5 9 58 GREATEST DAILY PRECIPITATION 33.0 20.0 26.0 67.0 14.0 1.0 0.0 0.0 0.0 0.0 6.0 16.0 67.0 DAY 21 2 13 8 13 17 ** ** ** ** 11 14 DAY WITH THUNDER STORM 0 0 1 1 1 0 0 0 0 0 0 0 3 DAYS WITH SNOW OR SLEET 10 8 3 3 0 0 0 0 0 0 1 0 25 DAYS WITH DUST 1 1 1 0 16 20 17 12 9 2 0 0 79 WIND DIRECTION (PREVAILING) 225 225 225 225 225 225 90 45 90 270 225 225 225 PREVAILING WIND SPEED(KNOTS) 11.5 9.7 11.1 8.6 9.0 7.8 7.7 6.7 7.1 9.1 8.1 8.3 9.2 PREVAILING WIND PERCENT 5.3 14.3 37.4 20.2 21.1 15.5 14.1 15.6 9.8 11.1 11.4 15.8 13.3 CALMS PERCENT OF WIND 92.2 83.4 54.1 63.0 57.5 59.7 71.8 71.7 74.5 73.3 82.3 71.7 71.1 NO. OF WIND OBSERVATION 244 223 246 238 247 238 248 244 204 180 237 247 2796 VECTOR WIND DIRECTION (MEAN) 242 236 241 244 239 233 75 68 165 266 231 242 237 VECTOR WIND MAGNITUDE(KNOTS) 0.8 1.4 4.6 1.8 2.0 0.9 1.4 1.5 0.2 0.7 1.1 2.2 1.1 WIND STEADINESES (MEAN %) 88.9 93.3 90.2 62.1 57.1 30.0 66.7 78.9 11.1 35.0 78.6 91.7 45.8 WIND SPEED (MEAN KNOTS) 0.9 1.5 5.1 2.9 3.5 3.0 2.1 1.9 1.8 2.0 1.4 2.4 2.4 FASTEST WIND DIRECTION 240 240 240 220 240 240 90 80 70 270 240 240 240 FASTEST WIND SPEED (KNOTS) 20 20 30 25 20 15 14 12 15 15 17 20 30 DAY 22 8 8 15 7 14 15 22 27 17 22 22 DAYS WITH SKY CLEAR (0-2)/8 10 13 12 6 23 28 29 31 30 29 15 13 239 DAYS WITH P.CLOUDY (3-6)/8 9 9 17 9 6 2 2 0 0 2 12 14 82 DAYS WITH CLOUDY (7-8)/8 12 6 2 15 2 0 0 0 0 0 3 4 44 DAYS WITH VISIBILITY =< 2 KM 4 4 0 0 0 0 0 0 0 0 0 1 9 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1961 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 825.4 823.9 822.4 823.6 823.9 823.2 819.5 822.2 821.9 828.0 826.7 825.2 823.8 MAX. QFE PRESSURE IN HPA 832.0 831.7 832.7 830.5 830.4 830.7 826.2 826.9 827.7 833.4 833.6 834.0 834.0 DAY-HOUR 10- 6 22- 6 4- 6 26- 6 14- 6 11- 6 24- 6 26- 6 25- 6 25- 6 1- 6 3- 6 MIN. QFE PRESSURE IN HPA 818.8 817.1 812.8 816.8 816.3 817.0 814.0 815.9 817.7 821.5 817.6 813.8 812.8 DAY-HOUR 21-12 2-12 13- 3 1-15 29-15 6-15 11-15 7-12 11-15 1-15 22-12 22-12 MEAN QNH PRESSURE IN HPA 1014.4 1012.6 1010.8 1012.2 1012.7 1011.8 1007.4 1010.6 1010.3 1017.5 1016.0 1014.2 1012.5 MAX. QNH PRESSURE IN HPA 1022.2 1021.8 1023.0 1020.4 1020.3 1020.7 1015.3 1016.2 1017.1 1023.9 1024.1 1024.6 1024.6 DAY-HOUR 10- 6 22- 6 4- 6 26- 6 14- 6 11- 6 24- 6 26- 6 25- 6 25- 6 1- 6 3- 6 MIN. QNH PRESSURE IN HPA 1006.6 1004.6 999.5 1004.2 1003.6 1004.5 1000.9 1003.2 1005.3 1009.8 1005.2 1000.7 999.5 DAY-HOUR 21-12 2-12 13- 3 1-15 29-15 6-15 11-15 7-12 11-15 1-15 22-12 22-12 MEAN QFF PRESSURE IN HPA 1018.0 1015.3 1008.8 1007.0 1001.5 997.6 990.6 995.6 997.3 ****** 1013.2 1013.9 ****** MAX. QFF PRESSURE IN HPA 1030.9 1026.6 1025.7 1017.7 1013.8 1006.4 999.3 1002.4 1005.3 ****** 1026.5 1025.6 ****** DAY-HOUR 15- 6 6- 6 4- 6 18- 3 14-15 11- 6 24- 6 10- 6 25- 3 **-** 29- 6 3- 6 MIN. QFF PRESSURE IN HPA 1006.3 1006.6 997.2 998.5 992.3 990.0 982.8 986.0 991.2 ****** 998.6 999.1 ****** DAY-HOUR 21-12 25- 0 8-21 13-12 28- 0 30-21 11-12 7-12 5-12 **-** 22-18 22-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 825.3 823.6 822.5 823.7 824.2 823.4 819.7 822.4 821.9 ****** 826.9 825.3 ****** MAX. QFE PRESSURE IN HPA 830.5 829.6 831.4 829.2 829.8 828.7 824.8 826.0 824.6 ****** 832.3 831.8 ****** DAY 10 22 4 26 15 11 25 10 8 ** 1 4 MIN. QFE PRESSURE IN HPA 819.1 818.8 813.0 817.7 816.8 818.9 815.7 817.2 820.0 ****** 818.2 815.7 ****** DAY 22 25 13 8 30 6 11 7 2 ** 23 22 MEAN QNH PRESSURE IN HPA 1014.3 1012.3 1010.9 1012.4 1012.9 1012.0 1007.6 1010.9 1010.2 ****** 1016.2 1014.3 ****** MAX. QNH PRESSURE IN HPA 1020.4 1019.4 1021.5 1018.9 1019.6 1018.3 1013.7 1015.1 1013.5 ****** 1022.5 1022.0 ****** DAY 10 22 4 26 15 11 25 10 8 ** 1 4 MIN. QNH PRESSURE IN HPA 1006.9 1006.6 999.7 1005.3 1004.2 1006.7 1002.9 1004.7 1008.0 ****** 1005.9 1002.9 ****** DAY 22 25 13 8 30 6 11 7 2 ** 23 22 MEAN QFF PRESSURE IN HPA 1017.2 1014.7 1008.2 1006.5 1001.2 997.5 990.3 995.2 996.2 ****** 1012.5 1013.2 ****** MAX. QFF PRESSURE IN HPA 1027.5 1022.4 1022.6 1016.8 1011.7 1003.7 997.0 1000.3 1000.5 ****** 1020.4 1020.7 ****** DAY 16 6 4 18 14 10 25 10 8 ** 29 4 MIN. QFF PRESSURE IN HPA 1006.8 1006.6 998.5 1000.0 992.3 990.7 985.4 987.9 992.5 ****** 1000.2 1000.2 ****** DAY 21 25 9 15 28 6 15 7 2 ** 23 22 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 825.3 823.8 822.7 823.8 824.4 823.9 820.4 822.9 822.9 828.3 827.0 825.4 824.2 MAX. QFE PRESSURE IN HPA 830.5 831.0 831.8 829.7 829.8 829.7 825.2 826.0 826.7 833.1 832.5 832.4 833.1 DAY 10 22 4 26 15 11 24 10 25 28 1 3 MIN. QFE PRESSURE IN HPA 819.9 818.6 812.8 817.3 816.8 818.9 816.0 817.6 820.3 823.2 818.6 815.7 812.8 DAY 22 17 13 8 30 6 11 7 11 1 23 22 MEAN QNH PRESSURE IN HPA 1014.3 1012.5 1011.1 1012.5 1013.2 1012.6 1008.5 1011.5 1011.4 1017.9 1016.3 1014.4 1013.0 MAX. QNH PRESSURE IN HPA 1020.4 1021.0 1022.0 1019.5 1019.6 1019.5 1014.2 1015.1 1015.9 1023.5 1022.8 1022.7 1023.5 DAY 10 22 4 26 15 11 24 10 25 28 1 3 MIN. QNH PRESSURE IN HPA 1007.9 1006.4 999.5 1004.8 1004.2 1006.7 1003.3 1005.2 1008.4 1011.8 1006.4 1002.9 999.5 DAY 22 17 13 8 30 6 11 7 11 1 23 22 MEAN QFF PRESSURE IN HPA 1018.2 1015.7 1010.0 1008.1 1003.2 999.7 992.7 997.5 999.9 1011.4 1014.6 1014.7 1007.1 MAX. QFF PRESSURE IN HPA 1027.8 1023.8 1024.1 1017.7 1013.1 1006.4 998.5 1001.8 1005.3 1021.6 1023.8 1023.6 1027.8 DAY 15 22 4 18 14 11 25 10 25 28 29 3 MIN. QFF PRESSURE IN HPA 1007.4 1008.1 1001.3 1002.5 994.7 993.4 987.0 989.9 994.9 1001.0 1001.3 1001.6 987.0 DAY 21 25 9 29 28 6 11 7 1 1 22 22 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1961 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 826.5 825.0 823.8 824.5 825.0 824.5 820.8 823.7 823.4 829.2 827.9 826.5 825.1 MAX. QFE PRESSURE IN HPA 832.0 831.7 832.7 830.5 830.4 830.7 826.2 826.9 827.7 833.4 833.6 834.0 834.0 DAY 10 22 4 26 14 11 24 26 25 25 1 3 MIN. QFE PRESSURE IN HPA 820.7 819.3 814.6 817.8 816.4 819.5 816.2 818.1 820.8 824.7 819.3 817.0 814.6 DAY 21 2 13 8 30 6 11 7 11 1 22 22 MEAN QNH PRESSURE IN HPA 1015.7 1014.0 1012.5 1013.4 1013.9 1013.3 1009.0 1012.3 1012.0 1018.8 1017.4 1015.6 1014.0 MAX. QNH PRESSURE IN HPA 1022.2 1021.8 1023.0 1020.4 1020.3 1020.7 1015.3 1016.2 1017.1 1023.9 1024.1 1024.6 1024.6 DAY 10 22 4 26 14 11 24 26 25 25 1 3 MIN. QNH PRESSURE IN HPA 1008.8 1007.2 1001.6 1005.4 1003.8 1007.4 1003.5 1005.8 1009.0 1013.6 1007.2 1004.5 1001.6 DAY 21 2 13 8 30 6 11 7 11 1 22 22 MEAN QFF PRESSURE IN HPA 1019.9 1017.3 1011.5 1008.7 1003.1 999.4 992.5 997.9 998.9 1013.9 1015.3 1016.1 1007.9 MAX. QFF PRESSURE IN HPA 1030.9 1026.6 1025.7 1017.2 1013.0 1006.4 999.3 1002.4 1003.1 1022.1 1026.5 1025.6 1030.9 DAY 15 6 4 18 14 11 24 10 8 28 29 3 MIN. QFF PRESSURE IN HPA 1008.9 1009.6 1001.8 1001.9 994.6 993.2 986.4 990.4 994.2 1006.5 1000.6 1003.3 986.4 DAY 21 17 30 13 30 6 11 7 1 21 22 22 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 826.0 824.7 822.8 824.0 824.3 823.6 819.9 822.7 822.5 828.2 826.9 825.5 824.3 MAX. QFE PRESSURE IN HPA 831.5 830.8 831.2 829.8 830.2 829.3 825.5 826.1 827.0 832.6 832.1 832.6 832.6 DAY 10 22 4 26 14 11 24 26 25 27 2 3 MIN. QFE PRESSURE IN HPA 821.1 818.5 814.6 818.0 816.4 818.1 815.6 817.0 819.5 823.7 819.7 816.0 814.6 DAY 21 2 13 8 30 6 11 7 21 3 22 22 MEAN QNH PRESSURE IN HPA 1015.1 1013.5 1011.4 1012.7 1013.1 1012.2 1007.9 1011.2 1011.0 1017.7 1016.2 1014.5 1013.0 MAX. QNH PRESSURE IN HPA 1021.6 1020.8 1021.3 1019.6 1020.1 1019.0 1014.5 1015.2 1016.3 1022.9 1022.3 1022.9 1022.9 DAY 10 22 4 26 14 11 24 26 25 27 2 3 MIN. QNH PRESSURE IN HPA 1009.3 1006.2 1001.6 1005.6 1003.8 1005.8 1002.8 1004.5 1007.4 1012.4 1007.7 1003.3 1001.6 DAY 21 2 13 8 30 6 11 7 21 3 22 22 MEAN QFF PRESSURE IN HPA 1018.5 1015.9 1008.5 1007.1 1000.7 997.3 990.4 995.2 996.5 ****** 1012.4 1013.9 ****** MAX. QFF PRESSURE IN HPA 1029.4 1024.6 1022.2 1016.6 1010.7 1004.3 996.2 999.8 1000.8 ****** 1022.8 1022.2 ****** DAY 15 5 4 17 14 9 25 9 13 ** 29 4 MIN. QFF PRESSURE IN HPA 1010.4 1008.9 999.8 999.6 994.1 991.0 984.7 987.3 993.5 ****** 1001.9 1001.3 ****** DAY 21 17 30 28 28 6 11 7 2 ** 22 22 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 824.7 823.3 821.3 822.6 823.1 822.2 818.4 821.0 820.6 826.7 825.6 824.2 822.8 MAX. QFE PRESSURE IN HPA 829.2 829.0 829.3 827.9 828.4 827.6 823.9 824.5 825.0 830.9 830.4 830.9 830.9 DAY 9 22 4 26 14 11 24 26 25 25 1 3 MIN. QFE PRESSURE IN HPA 818.8 817.1 815.0 817.0 816.7 817.2 814.1 815.9 817.9 822.0 817.6 813.8 813.8 DAY 21 2 13 8 29 6 11 7 11 3 22 22 MEAN QNH PRESSURE IN HPA 1013.6 1011.9 1009.6 1011.0 1011.7 1010.6 1006.1 1009.2 1008.8 1015.9 1014.7 1013.0 1011.3 MAX. QNH PRESSURE IN HPA 1018.9 1018.7 1019.0 1017.4 1017.9 1017.0 1012.6 1013.3 1013.9 1020.9 1020.3 1020.9 1020.9 DAY 9 22 4 26 14 11 24 26 25 25 1 3 MIN. QNH PRESSURE IN HPA 1006.6 1004.6 1002.1 1004.5 1004.1 1004.7 1001.0 1003.2 1005.5 1010.4 1005.2 1000.7 1000.7 DAY 21 2 13 8 29 6 11 7 11 3 22 22 MEAN QFF PRESSURE IN HPA 1016.5 1014.0 1006.7 1005.1 999.9 995.9 988.6 993.4 994.0 ****** 1011.0 1011.8 ****** MAX. QFF PRESSURE IN HPA 1027.6 1022.1 1019.5 1015.3 1009.2 1002.9 995.1 997.9 998.2 ****** 1019.2 1019.6 ****** DAY 15 6 4 17 13 10 24 26 7 ** 29 4 MIN. QFF PRESSURE IN HPA 1006.3 1007.4 998.7 998.5 993.0 990.1 982.8 986.0 991.2 ****** 998.9 999.1 ****** DAY 21 17 30 13 28 30 11 7 5 ** 22 22 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1961 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 825.1 823.4 821.6 822.6 822.9 821.8 818.0 820.7 820.8 827.0 826.2 824.8 822.9 MAX. QFE PRESSURE IN HPA 829.3 829.0 830.7 827.5 830.2 826.6 823.8 824.0 824.6 831.1 830.5 831.2 831.2 DAY 10 21 3 20 14 10 24 9 25 27 2 6 MIN. QFE PRESSURE IN HPA 819.2 817.3 816.0 816.8 816.3 817.0 814.0 815.9 817.7 821.5 818.3 815.4 814.0 DAY 21 2 13 1 29 6 11 7 11 1 22 22 MEAN QNH PRESSURE IN HPA 1014.0 1012.0 1009.9 1011.1 1011.4 1010.1 1005.7 1008.8 1008.9 1016.2 1015.3 1013.7 1011.4 MAX. QNH PRESSURE IN HPA 1019.0 1018.7 1020.7 1016.9 1020.1 1015.8 1012.5 1012.7 1013.5 1021.1 1020.4 1021.3 1021.3 DAY 10 21 3 20 14 10 24 9 25 27 2 6 MIN. QNH PRESSURE IN HPA 1007.1 1004.8 1003.3 1004.2 1003.6 1004.5 1000.9 1003.2 1005.3 1009.8 1006.0 1002.6 1000.9 DAY 21 2 13 1 29 6 11 7 11 1 22 22 MEAN QFF PRESSURE IN HPA 1017.9 1015.0 1008.6 1006.5 1001.4 997.0 989.8 994.9 997.4 1009.8 1013.5 1013.9 1005.5 MAX. QFF PRESSURE IN HPA 1028.0 1024.6 1021.4 1015.7 1013.8 1002.4 996.9 999.2 1002.4 1019.1 1021.5 1021.5 1028.0 DAY 15 5 3 17 14 10 24 26 25 27 29 4 MIN. QFF PRESSURE IN HPA 1007.3 1008.9 1000.8 999.4 994.7 990.8 984.7 987.5 992.7 999.3 1000.5 1001.9 984.7 DAY 21 13 30 13 29 30 14 7 4 1 22 22 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 825.3 823.6 822.2 823.7 823.7 822.9 819.2 822.0 821.2 828.8 826.7 825.1 823.7 MAX. QFE PRESSURE IN HPA 830.2 829.3 830.8 829.0 830.2 827.2 824.4 825.4 824.6 832.0 831.5 831.8 832.0 DAY 9 21 3 25 14 10 24 9 7 27 2 3 MIN. QFE PRESSURE IN HPA 819.2 818.0 815.6 818.1 817.0 818.5 815.5 817.6 819.0 824.9 817.6 815.2 815.2 DAY 21 2 12 1 29 30 10 6 11 6 22 22 MEAN QNH PRESSURE IN HPA 1014.3 1012.3 1010.6 1012.4 1012.3 1011.4 1007.1 1010.4 1009.5 1018.5 1016.0 1014.1 1012.4 MAX. QNH PRESSURE IN HPA 1020.1 1019.0 1020.8 1018.7 1020.1 1016.5 1013.2 1014.4 1013.5 1022.2 1021.6 1022.0 1022.2 DAY 9 21 3 25 14 10 24 9 7 27 2 3 MIN. QNH PRESSURE IN HPA 1007.1 1005.6 1002.8 1005.8 1004.5 1006.2 1002.7 1005.2 1006.8 1013.8 1005.2 1002.3 1002.3 DAY 21 2 12 1 29 30 10 6 11 6 22 22 MEAN QFF PRESSURE IN HPA 1018.5 1015.5 1009.5 1007.7 1001.6 997.4 990.6 996.0 997.3 1012.4 1013.8 1014.5 1006.2 MAX. QFF PRESSURE IN HPA 1028.8 1025.0 1022.9 1017.0 1012.6 1003.1 997.9 1001.4 1002.0 1020.5 1021.7 1023.3 1028.8 DAY 15 5 3 17 1 9 24 9 13 27 29 3 MIN. QFF PRESSURE IN HPA 1007.7 1007.6 1000.7 1002.0 994.4 990.5 986.1 989.1 993.3 1005.4 998.6 1000.4 986.1 DAY 21 13 8 14 27 30 10 6 1 6 22 22 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 825.2 823.7 822.4 823.8 824.1 823.4 819.6 822.5 821.9 ****** 826.7 825.2 ****** MAX. QFE PRESSURE IN HPA 830.3 829.6 831.0 829.2 830.0 828.4 824.8 826.0 824.5 ****** 831.8 831.8 ****** DAY 9 21 3 25 14 10 24 9 13 ** 2 3 MIN. QFE PRESSURE IN HPA 819.3 818.4 814.6 818.2 817.0 818.8 815.7 817.6 819.9 ****** 817.6 815.9 ****** DAY 21 2 12 1 29 30 10 6 11 ** 22 21 MEAN QNH PRESSURE IN HPA 1014.1 1012.4 1010.9 1012.5 1012.9 1012.0 1007.5 1011.0 1010.2 ****** 1016.0 1014.1 ****** MAX. QNH PRESSURE IN HPA 1020.2 1019.4 1021.0 1018.9 1019.8 1017.9 1013.7 1015.1 1013.3 ****** 1022.0 1022.0 ****** DAY 9 21 3 25 14 10 24 9 13 ** 2 3 MIN. QNH PRESSURE IN HPA 1007.2 1006.1 1001.6 1005.9 1004.5 1006.6 1002.9 1005.2 1007.9 ****** 1005.2 1003.2 ****** DAY 21 2 12 1 29 30 10 6 11 ** 22 21 MEAN QFF PRESSURE IN HPA 1017.7 1014.8 1008.1 1006.8 1000.8 997.0 990.0 995.3 996.5 ****** 1012.4 1013.7 ****** MAX. QFF PRESSURE IN HPA 1028.5 1023.3 1021.4 1017.3 1010.6 1004.5 997.0 1000.5 1000.2 ****** 1020.7 1022.0 ****** DAY 15 5 3 17 1 9 24 9 7 ** 28 3 MIN. QFF PRESSURE IN HPA 1007.6 1008.0 997.2 1001.1 992.4 990.0 985.6 988.6 991.9 ****** 999.5 1000.7 ****** DAY 26 24 8 27 27 30 10 6 1 ** 22 21 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1962 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -0.4 4.8 10.3 11.5 18.5 23.3 26.8 25.0 20.4 16.0 6.7 4.9 14.0 MINIMUN AIR TEMPERATURE (C) -4.1 -0.2 3.9 5.9 11.5 15.6 18.7 16.9 11.7 8.6 0.7 0.5 7.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 3 0 0 0 0 0 3 DAYS WITH MINIMUM TEMP. <=-4 16 6 0 0 0 0 0 0 0 0 7 3 32 DAYS WITH FREEZING MIN.<= 0 27 15 3 0 0 0 0 0 0 0 14 15 74 TEMPERATURE RECORDS LOWEST(C) -14.0 -5.0 -1.0 3.0 6.0 7.0 16.0 14.0 6.0 3.0 -7.0 -4.0 -14.0 DAY 17 1 3 20 1 11 22 11 26 12 27 1 MAXIMUM AIR TEMPERATURE (C) 3.9 11.3 17.8 18.5 26.3 31.6 35.4 33.3 30.2 24.9 15.6 11.8 21.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 9 25 31 31 16 1 0 0 113 DAYS WITH MAXIMUM TEMP. <= 0 3 0 0 0 0 0 0 0 0 0 0 0 3 TEMPERATURE RECORDS HIGHEST(C) 9.0 20.0 25.0 26.0 31.0 35.0 38.0 37.0 35.0 30.0 24.0 16.0 38.0 DAY 6 17 24 9 24 28 4 1 3 8 1 21 DIF. BETWEEN (MAX.-MIN.) (C) 8.0 11.5 13.9 12.6 14.8 16.0 16.7 16.4 18.5 16.3 14.9 11.3 14.2 MEAN DAILY TEMP. (MDT) (C) -0.1 5.6 10.9 12.2 18.9 23.6 27.0 25.1 21.0 16.8 8.2 6.2 14.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 8.0 85.5 187.0 127.0 35.0 0.0 0.0 0.0 442.5 HEATING DEG. DAYS(BASE 18 0C) 561.0 348.5 221.5 173.0 25.0 1.5 0.0 0.0 5.0 48.5 294.5 366.5 2045.0 DEWPOINT (MEAN C) -4.8 -3.0 -4.1 0.3 2.7 3.6 4.7 4.5 0.3 0.7 -2.3 -2.3 0.0 MIXING RATIO (G/KG) 3.34 3.87 3.54 4.92 5.78 6.24 6.69 6.59 4.99 4.93 4.21 4.06 4.93 VAPOUR PRESSURE (HPA) 4.40 5.08 4.65 6.45 7.59 8.16 8.74 8.63 6.56 6.51 5.57 5.35 6.47 SATURATION DEF. (HPA) 1.73 3.88 8.52 7.73 14.81 21.89 28.03 24.35 19.14 12.57 5.01 3.64 12.61 RELATIVE HUMIDITY (MEAN %) 73 60 39 51 38 30 26 28 28 38 56 63 44 RELATIVE HUMIDITY (MAX. %) 85 80 59 70 57 45 40 43 40 53 71 77 60 RELATIVE HUMIDITY (MIN. %) 60 40 24 34 23 18 16 18 17 22 34 45 29 RELATIVE HUMIDITY (MEAN% 03UTC) 77 74 55 68 56 44 38 42 39 52 68 71 57 RELATIVE HUMIDITY (MEAN% 09UTC) 67 52 31 39 29 22 19 21 20 26 36 50 34 RELATIVE HUMIDITY (MEAN% 15UTC) 73 52 30 44 28 23 19 20 23 33 55 60 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 63.3 34.1 3.1 162.0 8.0 2.0 0.0 0.0 0.0 0.1 11.5 48.2 332.3 DAYS WITH PRECIPITATION >=10 2 1 0 5 0 0 0 0 0 0 0 2 10 DAYS WITH PRECIPITATION >= 5 8 3 0 7 0 0 0 0 0 0 1 5 24 DAYS WITH PRECIPITATION >= 1 11 7 3 11 3 1 0 0 0 0 5 6 47 DAYS WITH PRECIPITATION 13 8 3 11 3 1 0 0 0 1 6 7 53 GREATEST DAILY PRECIPITATION 10.0 11.0 1.1 32.0 3.0 2.0 0.0 0.0 0.0 0.1 5.0 14.0 32.0 DAY 15 18 10 17 7 5 ** ** ** 24 7 9 DAY WITH THUNDER STORM 0 0 0 1 3 1 0 0 0 0 0 1 6 DAYS WITH SNOW OR SLEET 8 2 0 0 0 0 0 0 0 0 0 1 11 DAYS WITH DUST 0 0 2 1 0 13 3 10 10 2 1 1 43 WIND DIRECTION (PREVAILING) 225 225 225 225 270 90 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 12.7 11.7 10.1 9.3 7.4 6.6 7.4 7.0 5.8 7.1 6.0 8.8 8.1 PREVAILING WIND PERCENT 11.7 18.2 29.1 14.6 11.7 8.8 13.8 19.4 12.1 15.0 1.3 19.8 8.1 CALMS PERCENT OF WIND 83.1 70.5 60.3 66.9 75.7 73.2 78.5 74.5 83.7 83.4 97.9 79.4 77.3 NO. OF WIND OBSERVATION 248 220 247 239 247 239 247 247 239 247 239 247 2906 VECTOR WIND DIRECTION (MEAN) 238 235 238 247 257 2 95 86 87 280 288 272 244 VECTOR WIND MAGNITUDE(KNOTS) 1.9 2.7 3.8 2.2 1.2 0.3 1.2 1.2 0.5 1.1 0.1 1.7 0.9 WIND STEADINESES (MEAN %) 95.0 90.0 97.4 75.9 66.7 16.7 80.0 70.6 50.0 91.7 100.0 94.4 47.4 WIND SPEED (MEAN KNOTS) 2.0 3.0 3.9 2.9 1.8 1.8 1.5 1.7 1.0 1.2 0.1 1.8 1.9 FASTEST WIND DIRECTION 230 240 250 230 240 280 90 90 90 270 300 270 230 FASTEST WIND SPEED (KNOTS) 45 25 20 15 19 15 15 16 10 14 10 18 45 DAY 5 21 28 3 10 8 11 4 18 21 9 23 DAYS WITH SKY CLEAR (0-2)/8 11 10 10 7 19 26 26 26 26 18 22 12 213 DAYS WITH P.CLOUDY (3-6)/8 9 12 15 18 9 4 3 5 4 12 3 10 104 DAYS WITH CLOUDY (7-8)/8 11 6 6 5 3 0 2 0 0 1 5 9 48 DAYS WITH VISIBILITY =< 2 KM 3 2 1 0 0 0 0 0 0 1 0 0 7 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1962 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 825.4 822.9 823.3 821.9 824.0 822.4 821.8 823.6 825.3 828.2 829.7 825.9 824.5 MAX. QFE PRESSURE IN HPA 835.2 831.8 832.3 827.8 829.7 829.1 826.4 829.9 833.7 834.7 837.4 832.7 837.4 DAY-HOUR 19- 6 11- 6 3- 6 19- 6 16- 6 2- 6 31- 6 9- 6 25- 6 28- 6 23- 6 1- 6 MIN. QFE PRESSURE IN HPA 816.0 811.1 810.0 816.0 817.9 816.5 815.9 816.7 817.5 818.6 825.0 819.2 810.0 DAY-HOUR 5-12 20-15 28-12 4-15 25-15 9-12 14-12 2-15 16-12 10-12 3-12 16-15 MEAN QNH PRESSURE IN HPA 1014.4 1011.5 1011.9 1010.3 1012.8 1010.8 1010.1 1012.2 1014.2 1017.7 1019.4 1015.0 1013.4 MAX. QNH PRESSURE IN HPA 1026.0 1022.0 1022.5 1017.2 1019.5 1018.8 1015.6 1019.7 1024.2 1025.4 1028.6 1023.0 1028.6 DAY-HOUR 19- 6 11- 6 3- 6 19- 6 16- 6 2- 6 31- 6 9- 6 25- 6 28- 6 23- 6 1- 6 MIN. QNH PRESSURE IN HPA 1003.3 997.5 996.2 1003.3 1005.5 1003.9 1003.2 1004.1 1005.1 1006.4 1013.9 1007.1 996.2 DAY-HOUR 5-12 20-15 28-12 4-15 25-15 9-12 14-12 2-15 16-12 10-12 3-12 16-15 MEAN QFF PRESSURE IN HPA 1017.3 1010.2 1006.9 1004.2 1002.0 996.7 993.8 997.1 1002.3 1008.8 1017.1 1013.8 1005.8 MAX. QFF PRESSURE IN HPA 1033.7 1022.7 1022.4 1014.4 1012.3 1007.4 1000.6 1005.2 1016.1 1018.8 1030.8 1027.2 1033.7 DAY-HOUR 19- 6 10- 6 3- 6 19- 6 15-21 11- 3 27- 3 9- 3 26- 3 12- 6 24- 6 1- 6 MIN. QFF PRESSURE IN HPA 1001.6 993.0 987.5 994.6 992.4 988.0 987.1 987.5 990.5 996.5 1005.4 1005.3 987.1 DAY-HOUR 5-12 20-21 27-21 4-21 25-12 29-12 14-12 3-12 16-12 10-12 3-21 7-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 825.1 822.9 823.2 822.0 824.2 823.0 822.2 824.0 825.5 828.4 829.7 825.9 824.7 MAX. QFE PRESSURE IN HPA 833.8 828.3 829.8 826.0 829.6 828.1 825.1 828.8 832.6 833.1 835.8 831.4 835.8 DAY 19 2 4 24 17 2 31 10 26 28 23 1 MIN. QFE PRESSURE IN HPA 817.9 813.3 811.7 816.8 818.5 818.3 818.5 818.0 820.8 821.7 826.7 820.4 811.7 DAY 5 21 28 5 10 29 14 3 17 10 4 17 MEAN QNH PRESSURE IN HPA 1014.1 1011.5 1011.8 1010.4 1013.0 1011.6 1010.6 1012.7 1014.6 1017.9 1019.4 1015.0 1013.5 MAX. QNH PRESSURE IN HPA 1024.3 1017.8 1019.6 1015.1 1019.4 1017.6 1014.0 1018.4 1022.9 1023.5 1026.7 1021.5 1026.7 DAY 19 2 4 24 17 2 31 10 26 28 23 1 MIN. QNH PRESSURE IN HPA 1005.5 1000.1 998.2 1004.2 1006.2 1006.0 1006.2 1005.6 1009.0 1010.0 1015.9 1008.5 998.2 DAY 5 21 28 5 10 29 14 3 17 10 4 17 MEAN QFF PRESSURE IN HPA 1016.3 1009.6 1006.1 1004.0 1002.0 997.4 994.0 997.1 1002.0 1008.3 1016.2 1013.3 1005.5 MAX. QFF PRESSURE IN HPA 1030.7 1021.5 1017.9 1012.7 1011.0 1004.8 998.3 1003.2 1013.7 1014.4 1026.4 1022.4 1030.7 DAY 19 1 3 20 16 11 27 10 26 28 24 1 MIN. QFF PRESSURE IN HPA 1003.9 995.2 987.8 996.3 993.7 989.7 990.3 988.3 993.3 1000.2 1007.3 1006.4 987.8 DAY 5 18 28 5 10 29 13 3 12 10 4 17 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 825.2 823.3 823.6 822.4 824.6 823.3 822.8 824.7 826.1 828.8 829.9 826.0 825.1 MAX. QFE PRESSURE IN HPA 833.5 830.4 830.9 827.0 829.6 828.4 825.9 829.3 832.7 833.6 836.2 831.4 836.2 DAY 19 11 3 19 17 2 31 9 26 28 23 1 MIN. QFE PRESSURE IN HPA 818.2 813.6 811.4 817.4 818.5 818.7 818.9 819.5 821.6 821.3 826.7 820.6 811.4 DAY 5 21 28 5 10 29 14 3 12 10 4 9 MEAN QNH PRESSURE IN HPA 1014.1 1011.9 1012.3 1010.9 1013.4 1012.0 1011.3 1013.6 1015.3 1018.4 1019.7 1015.1 1014.0 MAX. QNH PRESSURE IN HPA 1024.0 1020.3 1020.9 1016.3 1019.4 1017.9 1015.0 1019.0 1023.0 1024.1 1027.2 1021.5 1027.2 DAY 19 11 3 19 17 2 31 9 26 28 23 1 MIN. QNH PRESSURE IN HPA 1005.9 1000.4 997.8 1004.9 1006.2 1006.5 1006.7 1007.4 1009.9 1009.6 1015.9 1008.7 997.8 DAY 5 21 28 5 10 29 14 3 12 10 4 9 MEAN QFF PRESSURE IN HPA 1017.2 1011.2 1008.1 1005.6 1003.7 998.9 996.1 999.7 1004.7 1010.9 1018.6 1014.8 1007.5 MAX. QFF PRESSURE IN HPA 1031.4 1022.4 1020.5 1011.9 1011.8 1007.4 1000.6 1005.2 1016.1 1018.7 1029.1 1024.5 1031.4 DAY 19 11 3 19 16 11 27 9 26 12 24 1 MIN. QFF PRESSURE IN HPA 1006.2 997.0 989.6 998.3 994.9 991.2 992.1 991.7 996.5 1001.7 1009.3 1008.2 989.6 DAY 5 18 28 5 10 29 14 3 12 10 4 17 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1962 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 826.6 824.3 824.7 823.0 825.0 823.6 823.2 825.1 826.9 829.5 830.9 827.2 825.8 MAX. QFE PRESSURE IN HPA 835.2 831.8 832.3 827.8 829.7 829.1 826.4 829.9 833.7 834.7 837.4 832.7 837.4 DAY 19 11 3 19 16 2 31 9 25 28 23 1 MIN. QFE PRESSURE IN HPA 817.7 815.3 812.3 817.0 818.1 819.1 819.3 820.3 821.7 823.5 827.8 822.1 812.3 DAY 5 21 28 5 10 29 14 3 16 10 4 9 MEAN QNH PRESSURE IN HPA 1015.8 1013.1 1013.5 1011.5 1013.9 1012.2 1011.8 1014.0 1016.1 1019.3 1020.9 1016.5 1014.9 MAX. QNH PRESSURE IN HPA 1026.0 1022.0 1022.5 1017.2 1019.5 1018.8 1015.6 1019.7 1024.2 1025.4 1028.6 1023.0 1028.6 DAY 19 11 3 19 16 2 31 9 25 28 23 1 MIN. QNH PRESSURE IN HPA 1005.3 1002.5 998.9 1004.5 1005.8 1006.9 1007.2 1008.4 1010.0 1012.1 1017.2 1010.5 998.9 DAY 5 21 28 5 10 29 14 3 16 10 4 9 MEAN QFF PRESSURE IN HPA 1019.2 1012.7 1009.4 1005.7 1003.1 998.1 995.4 998.9 1004.2 1010.8 1019.6 1016.5 1007.8 MAX. QFF PRESSURE IN HPA 1033.7 1022.7 1022.4 1014.4 1012.0 1006.5 1000.0 1004.7 1014.7 1018.8 1030.8 1027.2 1033.7 DAY 19 10 3 19 16 11 27 9 26 12 24 1 MIN. QFF PRESSURE IN HPA 1005.0 998.6 991.0 998.2 994.1 990.5 990.6 991.9 995.1 1003.3 1009.8 1010.0 990.5 DAY 5 18 28 5 10 29 14 3 12 10 4 9 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 825.8 823.5 823.7 822.1 824.3 822.5 822.3 823.8 825.5 828.3 829.7 825.8 824.8 MAX. QFE PRESSURE IN HPA 833.8 830.8 831.2 826.2 828.9 828.1 826.2 829.0 832.0 833.2 836.3 830.8 836.3 DAY 19 11 3 19 16 2 27 9 25 28 23 1 MIN. QFE PRESSURE IN HPA 817.6 815.5 811.0 816.9 818.5 818.2 818.0 818.9 819.0 821.4 826.6 820.6 811.0 DAY 5 20 28 5 10 9 14 3 16 10 3 9 MEAN QNH PRESSURE IN HPA 1014.9 1012.2 1012.4 1010.5 1013.1 1011.0 1010.7 1012.6 1014.5 1017.8 1019.5 1014.8 1013.7 MAX. QNH PRESSURE IN HPA 1024.3 1020.8 1021.3 1015.3 1018.5 1017.6 1015.3 1018.7 1022.2 1023.6 1027.3 1020.8 1027.3 DAY 19 11 3 19 16 2 27 9 25 28 23 1 MIN. QNH PRESSURE IN HPA 1005.2 1002.7 997.4 1004.3 1006.2 1005.9 1005.6 1006.7 1006.8 1009.7 1015.8 1008.7 997.4 DAY 5 20 28 5 10 9 14 3 16 10 3 9 MEAN QFF PRESSURE IN HPA 1017.6 1010.2 1006.6 1003.7 1001.6 996.0 993.6 996.6 1001.5 1007.7 1016.0 1012.1 1005.3 MAX. QFF PRESSURE IN HPA 1031.5 1021.9 1018.9 1012.9 1011.0 1003.8 1000.2 1003.1 1012.2 1015.3 1025.8 1018.1 1031.5 DAY 19 1 3 20 15 11 27 9 26 12 24 2 MIN. QFF PRESSURE IN HPA 1003.3 998.1 988.6 996.8 994.5 989.4 988.6 989.3 992.5 1000.1 1007.0 1007.8 988.6 DAY 5 20 28 10 25 29 14 21 16 10 4 12 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 824.7 821.8 822.1 821.0 823.1 821.2 820.8 822.3 824.1 827.0 828.6 824.9 823.5 MAX. QFE PRESSURE IN HPA 832.8 828.3 829.6 825.4 827.8 826.9 824.2 827.8 831.8 832.2 834.7 830.0 834.7 DAY 18 11 3 24 16 1 27 9 25 28 23 3 MIN. QFE PRESSURE IN HPA 816.0 812.9 810.0 816.4 818.0 816.5 815.9 817.0 817.5 818.6 825.0 819.4 810.0 DAY 5 20 28 5 25 9 14 3 16 10 3 16 MEAN QNH PRESSURE IN HPA 1013.5 1010.1 1010.5 1009.1 1011.7 1009.5 1009.0 1010.7 1012.9 1016.3 1018.2 1013.8 1012.1 MAX. QNH PRESSURE IN HPA 1023.1 1017.8 1019.4 1014.4 1017.2 1016.2 1013.0 1017.2 1022.0 1022.4 1025.4 1019.8 1025.4 DAY 18 11 3 24 16 1 27 9 25 28 23 3 MIN. QNH PRESSURE IN HPA 1003.3 999.6 996.2 1003.8 1005.6 1003.9 1003.2 1004.5 1005.1 1006.4 1013.9 1007.3 996.2 DAY 5 20 28 5 25 9 14 3 16 10 3 16 MEAN QFF PRESSURE IN HPA 1015.8 1007.8 1004.7 1002.7 1000.6 995.2 992.3 995.1 1000.2 1006.6 1015.0 1012.0 1004.0 MAX. QFF PRESSURE IN HPA 1030.3 1017.6 1016.3 1010.5 1007.3 1002.1 997.6 1001.9 1011.4 1013.0 1024.6 1019.3 1030.3 DAY 18 1 3 20 16 1 26 9 25 28 24 1 MIN. QFF PRESSURE IN HPA 1001.6 995.1 987.8 995.1 992.4 988.0 987.1 987.5 990.5 996.5 1006.5 1005.3 987.1 DAY 5 20 28 10 25 29 14 3 16 10 1 7 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1962 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 825.1 822.4 822.5 821.1 822.9 820.9 820.6 822.2 824.2 827.6 829.2 825.5 823.7 MAX. QFE PRESSURE IN HPA 833.4 828.2 829.9 825.1 828.0 826.2 824.2 827.8 832.6 832.5 835.4 830.4 835.4 DAY 18 10 3 23 16 1 26 9 25 27 23 3 MIN. QFE PRESSURE IN HPA 816.3 811.1 811.0 816.0 817.9 816.5 816.3 816.7 818.3 818.7 825.8 819.2 811.0 DAY 5 20 28 4 25 29 14 2 16 10 3 16 MEAN QNH PRESSURE IN HPA 1014.1 1010.8 1011.0 1009.3 1011.5 1009.1 1008.8 1010.6 1013.0 1017.0 1018.9 1014.5 1012.4 MAX. QNH PRESSURE IN HPA 1023.9 1017.7 1019.7 1014.0 1017.5 1015.3 1013.0 1017.2 1022.9 1022.8 1026.2 1020.3 1026.2 DAY 18 10 3 23 16 1 26 9 25 27 23 3 MIN. QNH PRESSURE IN HPA 1003.6 997.5 997.4 1003.3 1005.5 1003.9 1003.6 1004.1 1006.0 1006.5 1014.9 1007.1 997.4 DAY 5 20 28 4 25 29 14 2 16 10 3 16 MEAN QFF PRESSURE IN HPA 1017.2 1010.0 1006.7 1003.9 1001.7 995.9 993.5 996.7 1002.4 1009.4 1017.8 1014.1 1005.8 MAX. QFF PRESSURE IN HPA 1031.4 1019.7 1018.4 1012.2 1008.8 1002.8 999.3 1003.7 1015.1 1016.4 1028.1 1022.4 1031.4 DAY 18 10 3 20 16 1 26 9 25 28 23 1 MIN. QFF PRESSURE IN HPA 1003.6 994.1 991.6 995.9 993.7 988.4 988.7 988.1 993.6 998.0 1008.6 1007.3 988.1 DAY 5 20 28 4 25 29 14 2 16 10 3 7 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 825.5 822.6 823.2 821.9 824.0 821.9 821.1 822.9 824.8 827.9 829.6 825.9 824.3 MAX. QFE PRESSURE IN HPA 833.8 828.8 829.9 826.0 829.6 827.1 824.5 829.4 832.6 833.1 836.0 830.8 836.0 DAY 18 11 3 19 16 1 26 9 25 27 23 3 MIN. QFE PRESSURE IN HPA 818.8 811.3 811.0 816.4 818.8 817.0 817.1 818.0 819.2 819.1 826.3 820.0 811.0 DAY 5 20 27 4 10 29 14 2 16 10 3 16 MEAN QNH PRESSURE IN HPA 1014.6 1011.1 1011.8 1010.3 1012.7 1010.3 1009.3 1011.5 1013.7 1017.4 1019.3 1014.9 1013.1 MAX. QNH PRESSURE IN HPA 1024.3 1018.4 1019.7 1015.1 1019.4 1016.4 1013.3 1019.1 1022.9 1023.5 1026.9 1020.8 1026.9 DAY 18 11 3 19 16 1 26 9 25 27 23 3 MIN. QNH PRESSURE IN HPA 1006.6 997.7 997.4 1003.8 1006.6 1004.5 1004.6 1005.6 1007.1 1006.9 1015.5 1008.0 997.4 DAY 5 20 27 4 10 29 14 2 16 10 3 16 MEAN QFF PRESSURE IN HPA 1018.0 1010.8 1007.5 1004.5 1001.9 996.2 993.1 996.4 1002.0 1008.9 1018.0 1014.8 1006.0 MAX. QFF PRESSURE IN HPA 1031.8 1021.5 1018.3 1013.6 1010.6 1003.1 998.7 1004.8 1013.6 1017.2 1028.6 1023.3 1031.8 DAY 18 11 3 19 15 10 26 9 25 28 23 1 MIN. QFF PRESSURE IN HPA 1005.9 994.5 988.6 996.4 993.5 988.4 987.5 988.9 993.7 998.7 1008.5 1008.2 987.5 DAY 5 20 27 4 25 29 14 2 16 10 3 9 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 825.4 822.7 823.3 822.0 824.2 822.5 821.6 823.5 825.1 828.2 829.8 826.0 824.5 MAX. QFE PRESSURE IN HPA 833.8 828.4 829.8 826.0 829.6 827.9 825.0 829.6 832.6 833.6 836.2 830.8 836.2 DAY 18 1 3 19 16 1 26 9 25 28 23 3 MIN. QFE PRESSURE IN HPA 819.3 811.8 811.2 816.6 818.8 817.8 818.0 818.0 820.0 820.8 826.5 820.6 811.2 DAY 5 20 27 4 10 28 14 2 16 10 3 16 MEAN QNH PRESSURE IN HPA 1014.4 1011.2 1011.9 1010.3 1013.0 1011.0 1010.0 1012.2 1014.1 1017.7 1019.6 1015.2 1013.4 MAX. QNH PRESSURE IN HPA 1024.3 1017.9 1019.6 1015.1 1019.4 1017.4 1013.9 1019.4 1022.9 1024.1 1027.2 1020.8 1027.2 DAY 18 1 3 19 16 1 26 9 25 28 23 3 MIN. QNH PRESSURE IN HPA 1007.2 998.3 997.6 1004.0 1006.6 1005.4 1005.6 1005.6 1008.0 1009.0 1015.7 1008.7 997.6 DAY 5 20 27 4 10 28 14 2 16 10 3 16 MEAN QFF PRESSURE IN HPA 1017.0 1009.5 1006.1 1003.6 1001.6 996.3 992.9 996.2 1001.1 1007.8 1015.9 1012.7 1005.1 MAX. QFF PRESSURE IN HPA 1031.6 1020.3 1017.0 1013.5 1012.3 1003.7 998.3 1004.1 1013.7 1014.8 1026.0 1019.3 1031.6 DAY 18 11 2 19 15 10 27 9 25 28 23 1 MIN. QFF PRESSURE IN HPA 1005.3 993.0 987.5 994.6 994.1 988.5 988.6 988.1 992.3 999.8 1005.4 1006.7 987.5 DAY 5 20 27 4 25 28 14 2 11 10 3 16 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1963 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 5.3 6.8 9.9 14.7 16.8 26.3 29.8 28.7 25.2 19.1 9.5 2.0 16.2 MINIMUN AIR TEMPERATURE (C) 0.2 2.1 2.9 7.8 9.3 15.4 19.3 18.2 14.1 9.5 2.7 -3.6 8.2 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 10 1 0 0 0 0 11 DAYS WITH MINIMUM TEMP. <=-4 3 2 2 0 0 0 0 0 0 0 0 10 17 DAYS WITH FREEZING MIN.<= 0 18 9 5 0 0 0 0 0 0 0 6 28 66 TEMPERATURE RECORDS LOWEST(C) -4.0 -4.0 -6.0 4.0 3.0 13.0 17.0 15.0 10.0 6.0 -3.0 -16.0 -16.0 DAY 8 4 8 2 3 5 1 28 11 11 28 28 MAXIMUM AIR TEMPERATURE (C) 12.9 13.5 15.6 20.2 22.2 32.7 36.6 35.7 32.3 25.9 16.3 8.7 22.7 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 30 31 31 27 2 0 0 121 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 6 6 TEMPERATURE RECORDS HIGHEST(C) 17.0 19.0 23.0 25.0 28.0 36.0 39.0 39.0 36.0 30.0 22.0 17.0 39.0 DAY 15 20 24 21 24 28 19 13 1 1 2 24 DIF. BETWEEN (MAX.-MIN.) (C) 12.7 11.4 12.7 12.4 12.9 17.3 17.3 17.5 18.2 16.4 13.6 12.3 14.5 MEAN DAILY TEMP. (MDT) (C) 6.5 7.8 9.3 14.0 15.7 24.0 28.0 26.9 23.2 17.7 9.5 2.5 15.4 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 90.5 216.0 184.0 69.5 0.0 0.0 0.0 560.0 HEATING DEG. DAYS(BASE 18 0C) 355.0 286.0 271.0 120.0 85.0 0.0 0.0 0.0 0.0 30.5 255.5 479.5 1882.5 DEWPOINT (MEAN C) -2.5 -2.9 -5.1 1.6 4.4 4.7 4.3 4.1 0.3 0.4 -0.5 -5.7 0.3 MIXING RATIO (G/KG) 4.00 3.85 3.38 5.36 6.52 6.64 6.51 6.38 4.93 4.85 4.61 3.17 5.02 VAPOUR PRESSURE (HPA) 5.27 5.07 4.43 7.01 8.52 8.68 8.49 8.34 6.49 6.40 6.08 4.18 6.58 SATURATION DEF. (HPA) 3.97 5.33 8.35 10.32 11.68 26.90 35.44 32.81 27.14 16.76 6.32 3.54 15.71 RELATIVE HUMIDITY (MEAN %) 61 54 39 45 48 27 22 22 22 30 52 61 40 RELATIVE HUMIDITY (MAX. %) 78 72 59 68 71 42 34 35 33 45 69 76 57 RELATIVE HUMIDITY (MIN. %) 39 36 24 30 33 17 13 15 14 21 39 46 27 RELATIVE HUMIDITY (MEAN% 03UTC) 75 67 57 66 69 42 33 35 32 44 68 69 55 RELATIVE HUMIDITY (MEAN% 09UTC) 43 41 29 36 37 22 17 17 16 23 43 54 32 RELATIVE HUMIDITY (MEAN% 15UTC) 56 46 35 41 45 22 16 18 19 29 53 62 37 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 25.0 40.0 31.0 112.0 110.4 2.0 0.0 0.0 0.0 1.9 49.0 83.5 454.8 DAYS WITH PRECIPITATION >=10 1 1 1 4 5 0 0 0 0 0 2 3 17 DAYS WITH PRECIPITATION >= 5 2 5 1 7 7 0 0 0 0 0 3 5 30 DAYS WITH PRECIPITATION >= 1 5 5 6 12 13 1 0 0 0 1 4 8 55 DAYS WITH PRECIPITATION 5 5 6 12 16 1 0 0 0 2 6 9 62 GREATEST DAILY PRECIPITATION 10.0 10.0 18.0 40.0 24.2 2.0 0.0 0.0 0.0 1.3 20.0 24.0 40.0 DAY 27 10 27 30 14 30 ** ** ** 20 4 31 DAY WITH THUNDER STORM 3 0 0 4 4 0 0 0 0 0 0 0 11 DAYS WITH SNOW OR SLEET 0 1 0 0 0 0 0 0 0 0 0 6 7 DAYS WITH DUST 0 0 3 6 7 11 17 17 3 2 0 0 66 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 90 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 8.1 8.5 10.7 7.6 7.2 6.3 5.3 5.9 5.2 6.2 5.9 7.7 7.8 PREVAILING WIND PERCENT 16.6 36.3 52.9 48.7 40.6 24.0 20.0 27.1 15.3 23.2 16.0 17.4 25.3 CALMS PERCENT OF WIND 81.8 58.7 38.1 48.0 54.8 66.7 66.5 63.9 70.0 73.5 84.0 72.9 65.4 NO. OF WIND OBSERVATION 247 223 155 150 155 150 155 155 150 155 150 155 2000 VECTOR WIND DIRECTION (MEAN) 266 269 273 269 274 275 101 94 114 270 270 269 270 VECTOR WIND MAGNITUDE(KNOTS) 1.4 3.3 5.8 3.6 2.9 1.2 0.6 1.4 0.1 1.3 0.9 1.2 1.6 WIND STEADINESES (MEAN %) 100.0 94.3 93.5 92.3 93.5 60.0 31.6 66.7 5.9 81.2 100.0 63.2 64.0 WIND SPEED (MEAN KNOTS) 1.4 3.5 6.2 3.9 3.1 2.0 1.9 2.1 1.7 1.6 0.9 1.9 2.5 FASTEST WIND DIRECTION 270 270 270 270 280 270 290 90 270 270 280 260 270 FASTEST WIND SPEED (KNOTS) 15 28 20 16 25 11 10 10 13 10 10 15 28 DAY 3 24 5 18 28 11 14 17 22 16 1 10 DAYS WITH SKY CLEAR (0-2)/8 11 9 17 6 14 30 25 28 29 21 21 15 226 DAYS WITH P.CLOUDY (3-6)/8 15 12 10 14 9 0 6 3 1 10 3 9 92 DAYS WITH CLOUDY (7-8)/8 5 7 4 10 8 0 0 0 0 0 6 7 47 DAYS WITH VISIBILITY =< 2 KM 2 2 0 0 0 0 0 0 0 0 0 6 10 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1963 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 825.3 824.2 820.8 821.3 821.0 822.5 819.9 820.7 825.3 827.6 826.6 824.6 823.3 MAX. QFE PRESSURE IN HPA 828.7 831.6 829.4 829.0 826.2 827.6 823.5 824.8 834.6 831.6 831.0 833.1 834.6 DAY-HOUR 16- 6 4- 6 23- 6 2- 6 24- 6 27- 6 29- 6 5- 6 24- 6 18- 6 6- 6 21- 6 MIN. QFE PRESSURE IN HPA 820.2 816.7 812.3 814.6 813.7 816.2 816.7 816.0 817.8 823.8 822.8 813.2 812.3 DAY-HOUR 4- 0 12-12 5-12 16-12 2-15 15-15 27-12 12-12 4-12 25-12 25-12 31- 9 MEAN QNH PRESSURE IN HPA 1014.3 1013.0 1008.9 1009.5 1009.1 1011.0 1007.9 1008.8 1014.3 1017.0 1015.8 1013.5 1011.9 MAX. QNH PRESSURE IN HPA 1018.3 1021.7 1019.1 1018.7 1015.3 1017.0 1012.1 1013.7 1025.3 1021.7 1021.0 1023.5 1025.3 DAY-HOUR 16- 6 4- 6 23- 6 2- 6 24- 6 27- 6 29- 6 5- 6 24- 6 18- 6 6- 6 21- 6 MIN. QNH PRESSURE IN HPA 1008.2 1004.1 998.9 1001.6 1000.6 1003.5 1004.1 1003.3 1005.4 1012.5 1011.3 1000.0 998.9 DAY-HOUR 4- 0 12-12 5-12 16-12 2-15 15-15 27-12 12-12 4-12 25-12 25-12 31- 9 MEAN QFF PRESSURE IN HPA 1012.9 1010.4 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1021.6 1024.3 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR 9- 6 4- 6 **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA 1004.6 1000.1 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY-HOUR 24-12 25- 0 **-** **-** **-** **-** **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 825.2 824.2 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 827.6 829.8 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 30 4 ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 820.2 817.2 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 4 12 ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1014.2 1013.0 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1017.0 1019.6 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 30 4 ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1008.2 1004.7 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 4 12 ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1012.1 1009.6 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1017.5 1019.0 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 6 4 ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1004.6 1000.1 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 4 25 ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 825.4 824.3 821.1 821.6 821.5 823.4 820.9 821.8 826.2 828.3 826.8 824.6 823.8 MAX. QFE PRESSURE IN HPA 827.6 830.6 828.5 827.7 825.6 827.2 823.3 824.1 833.6 830.6 830.2 831.9 833.6 DAY 30 4 23 2 8 2 25 17 24 13 5 22 MIN. QFE PRESSURE IN HPA 820.2 816.8 815.2 816.2 814.6 817.6 819.4 819.3 820.5 825.0 823.6 813.3 813.3 DAY 4 12 5 16 11 16 1 12 4 25 25 31 MEAN QNH PRESSURE IN HPA 1014.4 1013.1 1009.3 1009.9 1009.7 1012.1 1009.1 1010.2 1015.3 1017.8 1016.1 1013.5 1012.5 MAX. QNH PRESSURE IN HPA 1017.0 1020.5 1018.1 1017.1 1014.6 1016.5 1011.9 1012.9 1024.1 1020.5 1020.1 1022.1 1024.1 DAY 30 4 23 2 8 2 25 17 24 13 5 22 MIN. QNH PRESSURE IN HPA 1008.2 1004.2 1002.3 1003.5 1001.6 1005.2 1007.3 1007.2 1008.6 1013.9 1012.3 1000.1 1000.1 DAY 4 12 5 16 11 16 1 12 4 25 25 31 MEAN QFF PRESSURE IN HPA 1013.9 1011.2 1006.4 1003.4 1001.9 998.6 993.4 995.1 1003.2 1009.5 1013.6 1016.1 1005.5 MAX. QFF PRESSURE IN HPA 1018.8 1022.5 1015.7 1012.3 1008.1 1004.5 996.1 999.0 1012.7 1012.9 1018.9 1030.2 1030.2 DAY 9 4 23 2 8 2 25 29 24 19 27 27 MIN. QFF PRESSURE IN HPA 1005.1 1000.9 997.9 998.0 995.7 991.2 991.1 991.8 994.7 1003.7 1007.6 998.6 991.1 DAY 4 25 16 18 11 16 28 13 4 25 1 25 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1963 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 826.6 825.3 821.9 822.3 821.8 823.7 821.2 822.2 826.8 829.0 827.7 825.8 824.5 MAX. QFE PRESSURE IN HPA 828.7 831.6 829.4 829.0 826.2 827.6 823.5 824.8 834.6 831.6 831.0 833.1 834.6 DAY 16 4 23 2 24 27 29 5 24 18 6 21 MIN. QFE PRESSURE IN HPA 821.6 818.8 814.1 816.6 815.2 817.7 819.5 819.2 820.7 826.3 824.6 813.9 813.9 DAY 4 12 5 16 11 16 12 12 3 25 16 31 MEAN QNH PRESSURE IN HPA 1015.8 1014.3 1010.3 1010.7 1010.2 1012.4 1009.5 1010.6 1016.0 1018.7 1017.2 1014.9 1013.4 MAX. QNH PRESSURE IN HPA 1018.3 1021.7 1019.1 1018.7 1015.3 1017.0 1012.1 1013.7 1025.3 1021.7 1021.0 1023.5 1025.3 DAY 16 4 23 2 24 27 29 5 24 18 6 21 MIN. QNH PRESSURE IN HPA 1009.9 1006.6 1001.0 1004.0 1002.3 1005.3 1007.4 1007.1 1008.8 1015.5 1013.5 1000.8 1000.8 DAY 4 12 5 16 11 16 12 12 3 25 16 31 MEAN QFF PRESSURE IN HPA 1015.5 1012.7 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1021.6 1024.3 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 9 4 ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1006.8 1005.0 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 4 12 ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 825.2 824.5 820.8 821.4 821.0 822.7 820.2 820.8 825.5 827.7 826.6 824.6 823.4 MAX. QFE PRESSURE IN HPA 827.2 830.6 827.6 828.0 825.5 827.1 822.1 823.9 833.5 830.5 829.9 832.1 833.5 DAY 5 4 23 2 24 27 21 5 24 18 5 21 MIN. QFE PRESSURE IN HPA 820.7 818.0 812.7 815.8 815.1 816.9 818.1 818.1 819.4 825.0 823.7 813.2 812.7 DAY 4 12 5 16 11 16 27 13 3 25 25 31 MEAN QNH PRESSURE IN HPA 1014.2 1013.3 1009.0 1009.6 1009.2 1011.2 1008.2 1009.0 1014.5 1017.1 1015.8 1013.5 1012.0 MAX. QNH PRESSURE IN HPA 1016.5 1020.5 1017.0 1017.5 1014.5 1016.4 1010.5 1012.6 1024.0 1020.4 1019.7 1022.3 1024.0 DAY 5 4 23 2 24 27 21 5 24 18 5 21 MIN. QNH PRESSURE IN HPA 1008.8 1005.6 999.4 1003.0 1002.2 1004.3 1005.8 1005.8 1007.3 1013.9 1012.4 1000.0 999.4 DAY 4 12 5 16 11 16 27 13 3 25 25 31 MEAN QFF PRESSURE IN HPA 1011.7 1010.2 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1017.5 1020.5 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 9 4 ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1004.7 1001.6 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 4 24 ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 824.3 823.1 819.7 820.4 820.2 821.4 818.8 819.3 824.0 826.3 825.5 823.8 822.2 MAX. QFE PRESSURE IN HPA 827.3 828.7 825.6 826.6 824.0 825.9 820.9 822.1 831.7 829.0 829.3 830.9 831.7 DAY 27 4 23 2 24 27 20 5 24 18 5 21 MIN. QFE PRESSURE IN HPA 820.7 816.7 812.3 814.6 814.8 816.5 816.7 816.0 817.8 823.8 822.8 814.1 812.3 DAY 24 12 5 16 2 16 27 12 4 25 25 31 MEAN QNH PRESSURE IN HPA 1013.1 1011.7 1007.6 1008.4 1008.3 1009.7 1006.6 1007.2 1012.7 1015.5 1014.5 1012.5 1010.6 MAX. QNH PRESSURE IN HPA 1016.6 1018.3 1014.6 1015.8 1012.7 1015.0 1009.1 1010.5 1021.8 1018.7 1019.0 1020.9 1021.8 DAY 27 4 23 2 24 27 20 5 24 18 5 21 MIN. QNH PRESSURE IN HPA 1008.8 1004.1 998.9 1001.6 1001.9 1003.9 1004.1 1003.3 1005.4 1012.5 1011.3 1001.0 998.9 DAY 24 12 5 16 2 16 27 12 4 25 25 31 MEAN QFF PRESSURE IN HPA 1010.9 1008.3 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1015.9 1017.4 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 5 4 ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1004.6 1001.1 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 24 25 ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1963 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 824.9 823.7 820.3 820.8 820.4 821.3 818.7 819.3 824.4 826.8 826.2 824.4 822.6 MAX. QFE PRESSURE IN HPA 827.9 829.4 825.4 827.9 824.8 825.9 820.9 821.7 832.2 829.6 830.0 831.8 832.2 DAY 28 4 22 2 24 27 20 20 24 18 5 21 MIN. QFE PRESSURE IN HPA 821.3 817.7 813.7 815.8 813.7 816.2 816.7 816.2 817.9 824.2 823.4 815.5 813.7 DAY 3 12 5 16 2 15 27 12 3 25 16 30 MEAN QNH PRESSURE IN HPA 1013.8 1012.4 1008.3 1009.0 1008.5 1009.6 1006.5 1007.1 1013.2 1016.1 1015.4 1013.3 1011.1 MAX. QNH PRESSURE IN HPA 1017.4 1019.1 1014.4 1017.4 1013.7 1015.0 1009.1 1010.0 1022.4 1019.4 1019.8 1022.0 1022.4 DAY 28 4 22 2 24 27 20 20 24 18 5 21 MIN. QNH PRESSURE IN HPA 1009.6 1005.3 1000.6 1003.0 1000.6 1003.5 1004.1 1003.5 1005.5 1013.0 1012.0 1002.7 1000.6 DAY 3 12 5 16 2 15 27 12 3 25 16 30 MEAN QFF PRESSURE IN HPA 1013.1 1010.4 1005.4 1002.5 1000.6 995.9 990.6 992.0 1001.0 1007.7 1012.8 1016.0 1004.0 MAX. QFF PRESSURE IN HPA 1017.8 1020.6 1013.6 1012.7 1005.8 1002.3 994.7 994.7 1011.0 1011.9 1017.2 1030.1 1030.1 DAY 5 4 8 2 7 2 5 28 24 18 18 26 MIN. QFF PRESSURE IN HPA 1007.5 1002.1 996.0 997.6 994.7 989.1 987.9 987.9 991.5 1002.4 1006.8 1003.0 987.9 DAY 3 25 5 18 10 15 27 12 3 25 1 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 825.5 824.3 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 828.2 829.9 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 27 4 ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 821.9 818.6 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 3 11 ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1014.5 1013.1 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1017.7 1019.7 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 27 4 ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1010.3 1006.4 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 3 11 ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1014.0 1011.4 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1018.8 1022.4 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 5 4 ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1007.9 1003.1 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 3 25 ** ** ** ** ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 825.7 824.4 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 827.8 829.8 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 27 3 ** ** ** ** ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 821.2 818.6 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 3 11 ** ** ** ** ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1014.7 1013.3 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1017.2 1019.6 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 27 3 ** ** ** ** ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1009.4 1006.4 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 3 11 ** ** ** ** ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1012.2 1010.0 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1016.8 1019.1 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 5 4 ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1005.1 1001.3 ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY 3 24 ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1964 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -11.1 4.0 11.5 13.8 21.8 27.3 30.6 29.2 24.6 15.6 8.4 -2.2 14.5 MINIMUN AIR TEMPERATURE (C) -17.3 -1.8 4.7 6.6 11.8 16.1 19.9 18.0 13.1 5.7 2.4 -6.6 6.0 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 10 2 0 0 0 0 12 DAYS WITH MINIMUM TEMP. <=-4 30 5 0 0 0 0 0 0 0 0 3 21 59 DAYS WITH FREEZING MIN.<= 0 31 25 2 0 0 0 0 0 0 0 5 27 90 TEMPERATURE RECORDS LOWEST(C) -26.0 -8.0 0.0 1.0 4.0 14.0 17.0 15.0 10.0 1.0 -6.0 -17.0 -26.0 DAY 7 7 1 10 2 19 2 26 18 29 29 21 MAXIMUM AIR TEMPERATURE (C) -4.6 9.6 16.9 19.2 28.4 34.3 37.6 36.3 32.5 23.7 14.7 3.1 21.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 13 30 31 31 27 2 0 0 134 DAYS WITH MAXIMUM TEMP. <= 0 24 0 0 0 0 0 0 0 0 0 0 14 38 TEMPERATURE RECORDS HIGHEST(C) 7.0 18.0 24.0 26.0 33.0 36.0 41.0 39.0 36.0 31.0 20.0 16.0 41.0 DAY 18 22 24 28 31 3 5 14 3 2 14 6 DIF. BETWEEN (MAX.-MIN.) (C) 12.7 11.4 12.2 12.6 16.6 18.2 17.7 18.3 19.4 18.0 12.3 9.7 15.0 MEAN DAILY TEMP. (MDT) (C) -11.0 3.9 10.8 12.9 20.1 25.2 28.8 27.1 22.8 14.7 8.6 -1.8 13.5 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 20.5 125.5 240.5 190.0 57.0 0.0 0.0 0.0 633.5 HEATING DEG. DAYS(BASE 18 0C) 897.5 409.0 223.0 155.5 14.5 0.0 0.0 0.0 0.0 109.0 282.5 613.5 2704.5 DEWPOINT (MEAN C) -14.8 -2.5 -2.2 -3.3 -1.4 3.1 6.1 4.3 3.0 -1.9 -1.8 -7.0 -1.5 MIXING RATIO (G/KG) 1.68 3.93 4.12 3.76 4.46 5.98 7.41 6.56 5.95 4.16 4.20 2.84 4.59 VAPOUR PRESSURE (HPA) 2.22 5.16 5.41 4.93 5.87 7.81 9.64 8.55 7.80 5.49 5.54 3.75 6.02 SATURATION DEF. (HPA) 0.81 3.30 8.82 11.63 21.53 30.13 36.24 33.98 25.06 13.63 6.14 1.98 16.10 RELATIVE HUMIDITY (MEAN %) 75 65 42 34 24 23 23 23 26 33 52 73 41 RELATIVE HUMIDITY (MAX. %) 83 83 61 53 40 36 37 35 40 46 68 82 55 RELATIVE HUMIDITY (MIN. %) 67 48 28 22 14 14 14 15 18 22 37 64 30 RELATIVE HUMIDITY (MEAN% 03UTC) 75 79 60 49 40 36 37 35 40 44 63 78 53 RELATIVE HUMIDITY (MEAN% 09UTC) 73 55 37 28 18 18 19 18 21 28 43 69 36 RELATIVE HUMIDITY (MEAN% 15UTC) 80 66 37 32 19 17 18 17 23 32 51 74 39 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 11.5 38.3 27.5 22.8 0.0 0.0 0.0 0.0 0.0 0.0 46.0 61.0 207.1 DAYS WITH PRECIPITATION >=10 0 2 0 1 0 0 0 0 0 0 3 3 9 DAYS WITH PRECIPITATION >= 5 1 3 2 2 0 0 0 0 0 0 4 3 15 DAYS WITH PRECIPITATION >= 1 2 11 7 3 0 0 0 0 0 0 7 4 34 DAYS WITH PRECIPITATION 4 16 10 5 0 0 0 0 0 0 7 4 46 GREATEST DAILY PRECIPITATION 9.0 10.6 9.0 12.0 0.0 0.0 0.0 0.0 0.0 0.0 13.0 29.0 29.0 DAY 19 6 1 9 ** ** ** ** ** ** 6 13 DAY WITH THUNDER STORM 0 0 1 1 0 0 0 0 0 0 0 0 2 DAYS WITH SNOW OR SLEET 3 6 1 0 0 0 0 0 0 0 0 5 15 DAYS WITH DUST 0 0 7 12 6 6 15 11 10 5 0 0 72 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 90 90 270 270 270 PREVAILING WIND SPEED(KNOTS) 9.8 6.2 9.2 11.3 8.2 6.4 7.0 5.6 6.2 5.2 10.1 5.8 8.8 PREVAILING WIND PERCENT 20.0 18.6 48.4 57.3 45.2 20.0 23.2 30.3 22.0 9.0 25.3 7.7 22.7 CALMS PERCENT OF WIND 78.1 77.9 46.5 37.3 45.8 66.7 63.2 59.4 72.0 78.1 72.7 91.0 65.7 NO. OF WIND OBSERVATION 155 145 155 150 155 150 155 155 150 155 150 155 1830 VECTOR WIND DIRECTION (MEAN) 271 265 268 269 274 273 96 96 92 198 265 266 268 VECTOR WIND MAGNITUDE(KNOTS) 2.0 1.1 4.6 6.4 3.8 1.0 0.9 1.3 1.0 0.1 2.7 0.4 1.6 WIND STEADINESES (MEAN %) 90.9 78.6 95.8 94.1 88.4 45.5 36.0 52.0 58.8 8.3 100.0 80.0 59.3 WIND SPEED (MEAN KNOTS) 2.2 1.4 4.8 6.8 4.3 2.2 2.5 2.5 1.7 1.2 2.7 0.5 2.7 FASTEST WIND DIRECTION 270 270 270 270 270 90 90 120 270 270 260 270 270 FASTEST WIND SPEED (KNOTS) 17 15 25 28 18 15 15 15 15 15 20 12 28 DAY 28 2 12 7 17 13 6 30 8 3 21 24 DAYS WITH SKY CLEAR (0-2)/8 18 9 9 12 21 26 28 31 30 31 17 12 244 DAYS WITH P.CLOUDY (3-6)/8 11 14 15 16 8 3 3 0 0 0 7 8 85 DAYS WITH CLOUDY (7-8)/8 2 6 7 2 2 1 0 0 0 0 6 11 37 DAYS WITH VISIBILITY =< 2 KM 1 1 1 3 0 0 0 0 0 0 0 8 14 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1964 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 824.9 822.6 822.2 819.9 823.9 820.7 819.0 819.2 824.2 828.3 826.8 827.5 823.3 MAX. QFE PRESSURE IN HPA 833.5 829.0 828.1 830.4 828.0 828.6 824.4 824.8 830.8 833.0 833.6 833.8 833.8 DAY-HOUR 30- 6 1- 6 23- 6 24- 6 10- 6 3- 6 22- 6 31- 6 29- 6 21- 6 2- 6 2- 6 MIN. QFE PRESSURE IN HPA 808.0 816.6 817.1 809.8 818.5 815.2 813.7 814.5 819.7 820.7 808.3 817.9 808.0 DAY-HOUR 19- 3 10-12 12- 9 9- 9 1- 9 29-12 7-15 17-12 10-12 3-12 27- 9 24-12 MEAN QNH PRESSURE IN HPA 1013.8 1011.0 1010.6 1007.9 1012.6 1008.9 1006.8 1007.0 1013.0 1017.9 1016.1 1016.9 1011.9 MAX. QNH PRESSURE IN HPA 1024.0 1018.7 1017.6 1020.3 1017.5 1018.2 1013.2 1013.7 1020.8 1023.4 1024.1 1024.3 1024.3 DAY-HOUR 30- 6 1- 6 23- 6 24- 6 10- 6 3- 6 22- 6 31- 6 29- 6 21- 6 2- 6 2- 6 MIN. QNH PRESSURE IN HPA 993.8 1004.0 1004.6 996.0 1006.2 1002.3 1000.6 1001.5 1007.7 1008.8 994.2 1005.5 993.8 DAY-HOUR 19- 3 10-12 12- 9 9- 9 1- 9 29-12 7-15 17-12 10-12 3-12 27- 9 24-12 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 824.6 822.7 822.5 820.5 824.6 822.0 820.3 820.3 825.1 828.9 827.2 827.6 823.9 MAX. QFE PRESSURE IN HPA 831.4 828.4 826.4 829.2 827.1 828.4 824.2 823.7 829.6 832.1 832.7 832.5 832.7 DAY 30 1 23 24 10 3 22 31 29 21 2 1 MIN. QFE PRESSURE IN HPA 808.0 819.1 818.0 812.5 819.3 817.6 815.9 817.6 821.8 822.8 812.6 818.8 808.0 DAY 19 10 1 9 1 27 8 17 9 3 27 24 MEAN QNH PRESSURE IN HPA 1013.4 1011.2 1011.0 1008.6 1013.4 1010.3 1008.3 1008.4 1014.1 1018.6 1016.5 1017.0 1012.6 MAX. QNH PRESSURE IN HPA 1021.5 1017.9 1015.6 1018.9 1016.4 1017.9 1013.0 1012.4 1019.4 1022.3 1023.0 1022.8 1023.0 DAY 30 1 23 24 10 3 22 31 29 21 2 1 MIN. QNH PRESSURE IN HPA 993.8 1006.9 1005.6 999.1 1007.2 1005.2 1003.2 1005.2 1010.1 1011.3 999.3 1006.6 993.8 DAY 19 10 1 9 1 27 8 17 9 3 27 24 MEAN QFF PRESSURE IN HPA 1027.0 1012.4 1006.9 1002.9 1003.1 996.3 991.9 993.2 1002.4 1013.0 1014.6 1022.9 1007.2 MAX. QFF PRESSURE IN HPA 1039.2 1024.2 1015.3 1017.7 1006.3 1004.5 996.0 997.9 1008.6 1020.4 1027.0 1030.0 1039.2 DAY 13 1 17 24 2 3 22 28 29 30 30 22 MIN. QFF PRESSURE IN HPA 997.8 1005.2 1000.7 992.1 1000.4 990.6 986.5 989.1 996.9 999.8 999.0 1006.0 986.5 DAY 19 23 11 22 1 27 8 17 4 3 27 24 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1964 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 825.8 823.6 823.4 821.0 825.0 822.1 820.4 820.7 825.8 829.8 828.1 828.7 824.5 MAX. QFE PRESSURE IN HPA 833.5 829.0 828.1 830.4 828.0 828.6 824.4 824.8 830.8 833.0 833.6 833.8 833.8 DAY 30 1 23 24 10 3 22 31 29 21 2 2 MIN. QFE PRESSURE IN HPA 811.2 819.1 818.7 811.8 818.8 817.5 815.9 817.6 822.6 822.8 811.4 820.0 811.2 DAY 19 10 1 9 1 27 8 17 9 3 27 24 MEAN QNH PRESSURE IN HPA 1014.9 1012.3 1012.0 1009.2 1013.9 1010.4 1008.5 1008.8 1014.9 1019.6 1017.6 1018.3 1013.4 MAX. QNH PRESSURE IN HPA 1024.0 1018.7 1017.6 1020.3 1017.5 1018.2 1013.2 1013.7 1020.8 1023.4 1024.1 1024.3 1024.3 DAY 30 1 23 24 10 3 22 31 29 21 2 2 MIN. QNH PRESSURE IN HPA 997.6 1006.9 1006.5 998.3 1006.6 1005.1 1003.2 1005.2 1011.1 1011.3 997.8 1008.0 997.6 DAY 19 10 1 9 1 27 8 17 9 3 27 24 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 825.1 822.9 822.4 819.9 824.0 820.8 819.2 819.4 824.4 828.5 826.8 827.5 823.4 MAX. QFE PRESSURE IN HPA 833.1 827.3 826.6 829.3 826.8 827.1 822.8 823.5 829.4 831.9 832.4 833.2 833.2 DAY 30 1 23 24 26 3 21 31 29 20 2 2 MIN. QFE PRESSURE IN HPA 812.4 818.1 817.1 809.8 818.5 816.4 814.8 816.2 821.3 821.3 808.3 818.5 808.3 DAY 19 10 12 9 1 27 8 17 8 3 27 24 MEAN QNH PRESSURE IN HPA 1014.0 1011.4 1010.8 1007.9 1012.8 1009.0 1007.1 1007.3 1013.2 1018.0 1016.0 1016.9 1012.0 MAX. QNH PRESSURE IN HPA 1023.5 1016.6 1015.8 1019.0 1016.0 1016.4 1011.3 1012.1 1019.1 1022.1 1022.7 1023.6 1023.6 DAY 30 1 23 24 26 3 21 31 29 20 2 2 MIN. QNH PRESSURE IN HPA 999.0 1005.8 1004.6 996.0 1006.2 1003.8 1001.9 1003.5 1009.6 1009.6 994.2 1006.2 994.2 DAY 19 10 12 9 1 27 8 17 8 3 27 24 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 824.2 821.6 821.1 818.8 822.8 819.4 817.7 817.8 822.7 827.0 825.8 826.7 822.1 MAX. QFE PRESSURE IN HPA 831.6 825.7 825.2 828.0 825.6 825.6 821.7 822.0 827.8 830.7 831.1 831.4 831.6 DAY 30 16 17 24 24 4 13 31 29 20 1 1 MIN. QFE PRESSURE IN HPA 809.7 816.6 817.4 810.8 818.8 815.2 813.7 814.5 819.7 820.7 809.3 817.9 809.3 DAY 18 10 12 9 1 29 8 17 10 3 27 24 MEAN QNH PRESSURE IN HPA 1012.9 1009.8 1009.3 1006.7 1011.4 1007.3 1005.3 1005.4 1011.2 1016.3 1014.8 1015.9 1010.5 MAX. QNH PRESSURE IN HPA 1021.7 1014.8 1014.2 1017.5 1014.6 1014.6 1010.0 1010.4 1017.2 1020.7 1021.1 1021.5 1021.7 DAY 30 16 17 24 24 4 13 31 29 20 1 1 MIN. QNH PRESSURE IN HPA 995.8 1004.0 1004.9 997.1 1006.6 1002.3 1000.6 1001.5 1007.7 1008.8 995.4 1005.5 995.4 DAY 18 10 12 9 1 29 8 17 10 3 27 24 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1964 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 824.9 822.1 821.6 819.3 823.0 819.4 817.5 817.8 823.0 827.5 826.4 827.2 822.5 MAX. QFE PRESSURE IN HPA 831.9 826.4 825.7 827.4 826.0 825.6 821.7 822.5 828.0 830.7 831.7 831.6 831.9 DAY 30 16 17 24 25 3 13 31 29 20 1 1 MIN. QFE PRESSURE IN HPA 808.2 817.5 818.2 811.9 819.0 815.5 813.7 814.5 819.8 821.5 811.9 818.7 808.2 DAY 18 3 6 8 1 27 7 17 9 3 27 24 MEAN QNH PRESSURE IN HPA 1013.8 1010.5 1009.9 1007.1 1011.5 1007.3 1005.1 1005.4 1011.5 1016.9 1015.6 1016.5 1010.9 MAX. QNH PRESSURE IN HPA 1022.1 1015.6 1014.8 1016.8 1015.1 1014.6 1010.0 1011.0 1017.5 1020.7 1021.8 1021.7 1022.1 DAY 30 16 17 24 25 3 13 31 29 20 1 1 MIN. QNH PRESSURE IN HPA 994.1 1005.1 1005.9 998.4 1006.8 1002.7 1000.6 1001.5 1007.8 1009.8 998.4 1006.5 994.1 DAY 18 3 6 8 1 27 7 17 9 3 27 24 MEAN QFF PRESSURE IN HPA 1027.3 1011.4 1005.6 1001.4 1001.1 993.2 988.6 990.0 999.7 1011.2 1013.6 1022.3 1005.5 MAX. QFF PRESSURE IN HPA 1037.6 1020.6 1012.0 1013.8 1003.6 1001.9 992.9 996.1 1006.7 1019.3 1026.7 1031.1 1037.6 DAY 8 7 14 23 2 1 13 31 29 31 30 28 MIN. QFF PRESSURE IN HPA 993.6 1004.4 1001.0 992.4 996.9 987.8 983.8 985.1 993.9 999.4 998.1 1005.1 983.8 DAY 18 3 19 7 11 27 8 17 8 3 27 24 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 ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1965 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -4.3 3.5 8.6 11.6 20.4 24.4 27.0 26.1 21.1 14.6 9.9 3.5 13.9 MINIMUN AIR TEMPERATURE (C) -8.4 -1.8 3.6 6.1 13.1 16.4 19.3 18.6 13.9 9.6 5.2 -1.1 7.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 1 0 6 3 0 0 0 0 10 DAYS WITH MINIMUM TEMP. <=-4 24 8 0 0 0 0 0 0 0 0 0 5 37 DAYS WITH FREEZING MIN.<= 0 31 19 6 4 0 0 0 0 0 0 0 21 81 TEMPERATURE RECORDS LOWEST(C) -20.0 -16.0 -3.0 -1.0 5.0 14.0 17.0 17.0 9.0 2.0 1.0 -13.0 -20.0 DAY 17 4 15 6 4 7 3 6 22 30 30 23 MAXIMUM AIR TEMPERATURE (C) 0.6 8.9 15.1 18.3 28.5 33.2 35.6 34.8 30.3 21.5 16.6 10.5 21.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 19 30 31 31 20 0 0 0 131 DAYS WITH MAXIMUM TEMP. <= 0 14 2 0 0 0 0 0 0 0 0 0 3 19 TEMPERATURE RECORDS HIGHEST(C) 7.0 16.0 21.0 28.0 33.0 35.0 39.0 37.0 35.0 27.0 21.0 18.0 39.0 DAY 8 28 11 26 20 3 14 4 1 15 4 14 DIF. BETWEEN (MAX.-MIN.) (C) 9.0 10.7 11.5 12.2 15.4 16.8 16.3 16.2 16.4 11.9 11.4 11.6 13.3 MEAN DAILY TEMP. (MDT) (C) -3.9 3.6 9.4 12.2 20.8 24.8 27.5 26.7 22.1 15.5 10.9 4.7 14.5 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 36.0 113.5 200.0 177.0 50.5 0.0 0.0 0.0 577.0 HEATING DEG. DAYS(BASE 18 0C) 677.5 403.5 268.0 178.5 16.0 0.0 0.0 0.0 2.5 84.5 213.0 413.0 2256.5 DEWPOINT (MEAN C) -6.6 -5.2 -2.5 -2.1 0.2 2.9 5.7 5.3 3.6 4.0 1.8 -3.4 0.3 MIXING RATIO (G/KG) 2.99 3.25 4.02 4.16 4.88 5.92 7.13 6.93 6.28 6.36 5.37 3.70 5.08 VAPOUR PRESSURE (HPA) 3.93 4.27 5.29 5.46 6.41 7.76 9.29 9.07 8.25 8.37 7.08 4.88 6.67 SATURATION DEF. (HPA) 0.77 4.17 6.49 9.13 19.02 24.16 27.87 26.28 18.15 9.06 5.51 3.46 12.84 RELATIVE HUMIDITY (MEAN %) 85 57 50 42 29 27 27 28 35 54 59 64 46 RELATIVE HUMIDITY (MAX. %) 91 77 68 62 47 43 40 41 52 75 77 79 63 RELATIVE HUMIDITY (MIN. %) 77 42 33 26 16 15 16 17 20 33 40 48 32 RELATIVE HUMIDITY (MEAN% 03UTC) 87 74 65 56 43 39 39 38 44 69 74 72 58 RELATIVE HUMIDITY (MEAN% 09UTC) 81 49 39 30 20 18 20 19 24 41 46 52 37 RELATIVE HUMIDITY (MEAN% 15UTC) 86 53 41 36 20 19 20 21 29 44 52 62 40 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 92.2 3.0 68.5 19.8 4.9 0.0 0.0 0.0 13.0 70.6 27.4 27.0 326.4 DAYS WITH PRECIPITATION >=10 3 0 2 0 0 0 0 0 0 2 1 2 10 DAYS WITH PRECIPITATION >= 5 4 0 2 2 0 0 0 0 1 2 3 2 16 DAYS WITH PRECIPITATION >= 1 10 2 5 4 3 0 0 0 4 8 5 4 45 DAYS WITH PRECIPITATION 11 3 8 6 5 0 0 0 6 10 6 4 59 GREATEST DAILY PRECIPITATION 30.0 2.0 40.0 9.0 2.0 0.0 0.0 0.0 6.0 45.0 10.0 12.0 45.0 DAY 9 5 2 19 23 ** ** ** 29 29 9 21 DAY WITH THUNDER STORM 0 1 0 1 2 1 0 0 3 1 0 0 9 DAYS WITH SNOW OR SLEET 9 1 1 0 0 0 0 0 0 0 0 4 15 DAYS WITH DUST 0 1 6 1 11 5 14 5 3 0 0 0 46 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 270 270 225 225 270 PREVAILING WIND SPEED(KNOTS) 11.4 10.6 8.6 8.9 7.5 6.0 5.7 5.8 6.1 6.5 5.8 6.2 8.1 PREVAILING WIND PERCENT 3.2 34.0 24.6 29.8 18.1 13.4 9.7 12.1 5.0 13.8 7.9 3.6 12.2 CALMS PERCENT OF WIND 96.8 65.3 66.7 60.0 70.6 83.3 80.6 81.8 90.0 69.2 88.7 90.7 78.6 NO. OF WIND OBSERVATION 158 144 228 235 248 239 247 247 239 247 239 247 2718 VECTOR WIND DIRECTION (MEAN) 270 269 265 262 255 261 82 103 292 236 207 221 256 VECTOR WIND MAGNITUDE(KNOTS) 0.4 3.6 2.2 3.3 1.9 0.8 0.2 0.5 0.1 1.7 0.6 0.5 1.1 WIND STEADINESES (MEAN %) 100.0 97.3 78.6 97.1 86.4 80.0 20.0 45.5 20.0 85.0 100.0 83.3 68.7 WIND SPEED (MEAN KNOTS) 0.4 3.7 2.8 3.4 2.2 1.0 1.0 1.1 0.5 2.0 0.6 0.6 1.6 FASTEST WIND DIRECTION 270 270 270 270 250 250 90 310 290 210 220 240 270 FASTEST WIND SPEED (KNOTS) 14 22 20 25 16 22 12 12 10 18 12 18 25 DAY 8 13 11 19 2 9 26 31 12 25 7 17 DAYS WITH SKY CLEAR (0-2)/8 9 11 10 14 20 28 28 24 22 7 16 20 209 DAYS WITH P.CLOUDY (3-6)/8 14 15 15 9 7 2 3 7 5 21 11 7 116 DAYS WITH CLOUDY (7-8)/8 8 2 6 7 4 0 0 0 3 3 3 4 40 DAYS WITH VISIBILITY =< 2 KM 12 2 0 0 0 1 1 0 0 0 0 0 16 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1965 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 821.8 822.2 823.9 821.6 824.3 822.5 820.1 824.0 825.8 826.5 827.7 826.0 823.9 MAX. QFE PRESSURE IN HPA 829.4 828.7 830.5 828.6 831.2 828.4 825.8 829.7 831.6 832.5 831.8 831.4 832.5 DAY-HOUR 16- 6 1- 6 16- 6 25- 6 20- 6 2- 6 16- 6 20- 6 15- 6 4-18 14- 6 22- 6 MIN. QFE PRESSURE IN HPA 808.1 810.7 814.9 811.2 818.0 816.7 814.2 817.8 821.8 815.8 822.7 817.0 808.1 DAY-HOUR 11- 3 23- 3 23-12 3-15 3-12 24-12 11-12 1-12 3-12 25- 0 9-12 20-12 MEAN QNH PRESSURE IN HPA 1010.1 1010.6 1012.6 1009.9 1013.1 1011.0 1008.1 1012.7 1014.9 1015.7 1017.1 1015.1 1012.6 MAX. QNH PRESSURE IN HPA 1019.1 1018.3 1020.4 1018.2 1021.3 1017.9 1014.9 1019.5 1021.7 1022.8 1022.0 1021.5 1022.8 DAY-HOUR 16- 6 1- 6 16- 6 25- 6 20- 6 2- 6 16- 6 20- 6 15- 6 4-18 14- 6 22- 6 MIN. QNH PRESSURE IN HPA 993.9 997.0 1002.0 997.6 1005.6 1004.1 1001.2 1005.4 1010.1 1003.0 1011.2 1004.5 993.9 DAY-HOUR 11- 3 23- 3 23-12 3-15 3-12 24-12 11-12 1-12 3-12 25- 0 9-12 20-12 MEAN QFF PRESSURE IN HPA ****** ****** 1009.1 1004.0 1001.2 996.3 991.6 996.9 1002.4 1007.4 1012.3 1015.1 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1022.9 1017.0 1009.9 1004.7 998.9 1004.2 1011.9 1019.6 1020.1 1030.1 ****** DAY-HOUR **-** **-** 16- 6 10- 6 4-18 2- 6 17- 6 9- 6 30- 3 29-15 25- 6 22- 6 MIN. QFF PRESSURE IN HPA ****** ****** 998.0 991.0 994.9 988.8 983.6 988.4 995.9 992.1 1004.8 1005.1 ****** DAY-HOUR **-** **-** 23- 0 19-12 30-12 23-12 11- 9 1-12 3-12 24-21 17- 9 15-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 823.9 821.8 824.3 822.8 820.4 824.0 826.0 826.4 827.8 826.0 ****** MAX. QFE PRESSURE IN HPA ****** ****** 828.3 827.4 830.6 827.0 824.9 827.5 830.1 831.5 830.8 830.1 ****** DAY ** ** 16 25 21 3 16 21 15 5 29 6 MIN. QFE PRESSURE IN HPA ****** ****** 816.6 811.8 818.1 817.8 815.0 819.5 823.0 815.8 824.3 819.4 ****** DAY ** ** 23 4 2 24 11 1 4 25 10 25 MEAN QNH PRESSURE IN HPA ****** ****** 1012.6 1010.2 1013.1 1011.3 1008.4 1012.7 1015.1 1015.6 1017.2 1015.1 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1017.8 1016.8 1020.5 1016.3 1013.8 1016.9 1019.9 1021.6 1020.8 1019.9 ****** DAY ** ** 16 25 21 3 16 21 15 5 29 6 MIN. QNH PRESSURE IN HPA ****** ****** 1004.0 998.3 1005.8 1005.4 1002.1 1007.4 1011.6 1003.0 1013.1 1007.3 ****** DAY ** ** 23 4 2 24 11 1 4 25 10 25 MEAN QFF PRESSURE IN HPA ****** ****** 1008.4 1003.8 1001.0 996.4 991.5 996.4 1001.9 1007.0 1011.9 1014.4 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1018.4 1012.9 1007.6 1002.3 997.0 1000.6 1009.0 1018.0 1017.2 1028.0 ****** DAY ** ** 16 10 5 2 17 10 30 30 30 23 MIN. QFF PRESSURE IN HPA ****** ****** 998.0 993.3 996.8 989.3 984.9 990.7 997.4 992.6 1007.1 1006.3 ****** DAY ** ** 23 4 18 24 11 1 12 25 7 15 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 821.7 822.2 824.3 822.1 824.9 823.4 821.2 824.7 826.5 826.8 828.1 826.2 824.4 MAX. QFE PRESSURE IN HPA 828.5 827.8 828.3 828.4 830.6 827.6 825.6 828.4 831.0 832.1 831.2 830.1 832.1 DAY 31 1 16 25 21 3 16 20 15 5 29 4 MIN. QFE PRESSURE IN HPA 808.1 810.7 816.1 812.4 819.8 818.6 815.9 820.6 823.8 815.8 823.4 819.1 808.1 DAY 11 23 23 4 2 24 11 1 4 25 9 20 MEAN QNH PRESSURE IN HPA 1010.1 1010.6 1013.0 1010.5 1013.9 1012.1 1009.4 1013.6 1015.7 1016.0 1017.6 1015.3 1013.2 MAX. QNH PRESSURE IN HPA 1018.1 1017.2 1017.8 1017.9 1020.5 1017.0 1014.6 1017.9 1021.0 1022.3 1021.3 1019.9 1022.3 DAY 31 1 16 25 21 3 16 20 15 5 29 4 MIN. QNH PRESSURE IN HPA 993.9 997.0 1003.4 999.0 1007.8 1006.4 1003.2 1008.7 1012.5 1003.0 1012.0 1006.9 993.9 DAY 11 23 23 4 2 24 11 1 4 25 9 20 MEAN QFF PRESSURE IN HPA 1017.3 1012.3 1010.1 1005.5 1003.0 998.4 993.9 998.9 1004.4 1008.8 1013.7 1016.3 1006.9 MAX. QFF PRESSURE IN HPA 1033.8 1024.1 1020.3 1016.0 1009.7 1004.3 998.6 1003.5 1011.9 1019.3 1019.5 1028.4 1033.8 DAY 17 3 16 10 5 2 17 9 30 30 29 23 MIN. QFF PRESSURE IN HPA 997.1 994.2 998.5 995.6 998.6 992.3 987.8 993.4 999.6 993.9 1007.2 1007.7 987.8 DAY 11 23 23 19 18 24 11 1 12 25 9 28 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1965 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 822.7 823.2 825.1 822.7 825.3 823.7 821.4 825.3 827.1 827.3 828.8 826.9 825.0 MAX. QFE PRESSURE IN HPA 829.4 828.7 830.5 828.6 831.2 828.4 825.8 829.7 831.6 832.1 831.8 831.4 832.1 DAY 16 1 16 25 20 2 16 20 15 5 14 22 MIN. QFE PRESSURE IN HPA 810.1 813.0 815.6 813.6 819.8 818.6 815.7 820.3 823.5 817.8 824.7 819.0 810.1 DAY 11 9 23 4 2 24 11 1 12 25 9 20 MEAN QNH PRESSURE IN HPA 1011.2 1011.8 1014.1 1011.2 1014.3 1012.4 1009.7 1014.2 1016.4 1016.7 1018.4 1016.2 1013.9 MAX. QNH PRESSURE IN HPA 1019.1 1018.3 1020.4 1018.2 1021.3 1017.9 1014.9 1019.5 1021.7 1022.3 1022.0 1021.5 1022.3 DAY 16 1 16 25 20 2 16 20 15 5 14 22 MIN. QNH PRESSURE IN HPA 996.3 999.7 1002.8 1000.4 1007.8 1006.4 1002.9 1008.4 1012.1 1005.4 1013.6 1006.8 996.3 DAY 11 9 23 4 2 24 11 1 12 25 9 20 MEAN QFF PRESSURE IN HPA ****** ****** 1011.1 1005.5 1002.4 997.6 993.3 998.6 1004.2 1008.5 1014.3 1017.1 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1022.9 1017.0 1009.5 1004.7 998.9 1004.2 1010.6 1017.8 1020.1 1030.1 ****** DAY ** ** 16 10 4 2 17 9 29 30 25 22 MIN. QFF PRESSURE IN HPA ****** ****** 998.9 998.5 998.3 990.5 986.4 991.9 998.9 996.9 1008.0 1009.0 ****** DAY ** ** 23 4 31 24 11 1 12 25 17 15 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 822.0 822.3 824.1 821.5 824.2 822.6 820.1 824.0 825.7 826.2 827.5 825.9 823.8 MAX. QFE PRESSURE IN HPA 829.2 827.9 829.3 827.3 830.1 826.5 824.7 828.1 829.9 831.2 830.5 830.0 831.2 DAY 31 1 16 25 20 2 16 20 15 5 28 5 MIN. QFE PRESSURE IN HPA 810.8 812.0 815.6 813.6 818.4 817.5 814.5 819.5 822.3 817.2 823.6 817.9 810.8 DAY 11 9 23 4 3 24 11 1 12 25 9 20 MEAN QNH PRESSURE IN HPA 1010.3 1010.7 1012.8 1009.8 1013.0 1011.1 1008.1 1012.8 1014.8 1015.4 1016.9 1015.0 1012.6 MAX. QNH PRESSURE IN HPA 1018.9 1017.4 1019.0 1016.6 1019.9 1015.7 1013.6 1017.6 1019.7 1021.3 1020.4 1019.8 1021.3 DAY 31 1 16 25 20 2 16 20 15 5 28 5 MIN. QNH PRESSURE IN HPA 997.1 998.6 1002.8 1000.4 1006.1 1005.1 1001.5 1007.4 1010.7 1004.7 1012.3 1005.5 997.1 DAY 11 9 23 4 3 24 11 1 12 25 9 20 MEAN QFF PRESSURE IN HPA ****** ****** 1008.6 1003.2 1000.2 995.6 990.7 996.1 1001.3 1006.3 1011.1 1014.0 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1019.9 1012.6 1008.8 1001.4 996.2 1001.4 1007.4 1019.4 1015.5 1025.5 ****** DAY ** ** 16 10 4 2 16 9 29 29 25 22 MIN. QFF PRESSURE IN HPA ****** ****** 999.1 995.5 996.3 988.8 983.6 990.6 996.0 996.1 1004.8 1005.2 ****** DAY ** ** 23 3 31 24 11 2 12 25 17 15 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 821.1 821.2 822.7 820.3 823.2 821.3 818.7 822.8 824.3 825.2 826.5 824.9 822.7 MAX. QFE PRESSURE IN HPA 828.0 827.1 827.5 825.3 828.6 825.1 824.1 826.5 827.5 830.0 829.5 829.2 830.0 DAY 31 1 16 25 20 2 15 20 15 29 14 31 MIN. QFE PRESSURE IN HPA 811.1 813.2 814.9 812.0 818.0 816.7 814.2 817.8 821.8 816.2 822.7 817.0 811.1 DAY 11 9 23 3 3 24 11 1 3 25 9 20 MEAN QNH PRESSURE IN HPA 1009.3 1009.5 1011.2 1008.4 1011.8 1009.5 1006.5 1011.3 1013.1 1014.2 1015.7 1013.8 1011.2 MAX. QNH PRESSURE IN HPA 1017.5 1016.4 1016.9 1014.3 1018.2 1014.0 1012.9 1015.7 1016.9 1019.8 1019.2 1018.9 1019.8 DAY 31 1 16 25 20 2 15 20 15 29 14 31 MIN. QNH PRESSURE IN HPA 997.5 1000.0 1002.0 998.6 1005.6 1004.1 1001.2 1005.4 1010.1 1003.5 1011.2 1004.5 997.5 DAY 11 9 23 3 3 24 11 1 3 25 9 20 MEAN QFF PRESSURE IN HPA ****** ****** 1007.0 1002.1 999.6 994.5 989.5 995.0 999.9 1005.7 1010.3 1012.9 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1017.6 1009.8 1008.1 999.8 995.9 999.1 1005.9 1018.4 1015.1 1026.2 ****** DAY ** ** 16 10 4 1 16 20 29 29 29 22 MIN. QFF PRESSURE IN HPA ****** ****** 998.6 991.0 994.9 988.8 985.0 988.4 995.9 995.6 1005.8 1005.1 ****** DAY ** ** 23 19 30 23 29 1 3 25 16 15 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1965 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 821.8 821.9 823.1 820.6 823.2 821.0 818.5 822.7 824.7 826.0 827.1 825.4 823.0 MAX. QFE PRESSURE IN HPA 828.4 827.9 827.6 825.4 828.6 825.1 823.8 825.8 827.9 831.2 830.3 830.3 831.2 DAY 31 1 16 29 20 2 15 19 20 4 28 31 MIN. QFE PRESSURE IN HPA 812.4 814.0 816.1 811.2 818.5 816.7 814.2 818.3 821.8 816.1 823.2 819.3 811.2 DAY 10 9 23 3 3 24 11 1 3 25 9 20 MEAN QNH PRESSURE IN HPA 1010.2 1010.2 1011.7 1008.8 1011.8 1009.2 1006.2 1011.2 1013.6 1015.2 1016.3 1014.4 1011.6 MAX. QNH PRESSURE IN HPA 1017.9 1017.4 1017.0 1014.4 1018.2 1014.0 1012.5 1014.9 1017.4 1021.3 1020.2 1020.2 1021.3 DAY 31 1 16 29 20 2 15 19 20 4 28 31 MIN. QNH PRESSURE IN HPA 999.0 1000.9 1003.4 997.6 1006.2 1004.1 1001.2 1006.0 1010.1 1003.4 1011.8 1007.2 997.6 DAY 10 9 23 3 3 24 11 1 3 25 9 20 MEAN QFF PRESSURE IN HPA 1017.3 1011.6 1008.7 1003.7 1000.9 995.4 990.6 996.4 1002.1 1008.0 1012.5 1015.2 1005.2 MAX. QFF PRESSURE IN HPA 1031.8 1023.6 1019.1 1013.9 1008.9 1000.9 996.7 1000.8 1009.9 1019.6 1018.6 1027.5 1031.8 DAY 16 2 16 9 4 1 16 10 29 29 29 22 MIN. QFF PRESSURE IN HPA 1002.1 999.5 1001.1 994.1 995.9 989.7 986.7 990.5 997.7 995.9 1007.7 1008.2 986.7 DAY 10 9 23 3 30 28 28 1 3 24 9 14 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 824.1 822.1 824.7 822.6 820.2 824.2 826.4 827.1 827.8 826.3 ****** MAX. QFE PRESSURE IN HPA ****** ****** 828.4 827.7 829.8 826.8 825.0 827.7 829.9 832.5 830.6 831.4 ****** DAY ** ** 16 25 20 2 15 9 14 4 28 31 MIN. QFE PRESSURE IN HPA ****** ****** 816.8 811.2 820.6 817.9 815.7 820.1 823.3 817.0 823.9 820.2 ****** DAY ** ** 23 3 2 23 10 1 23 25 9 24 MEAN QNH PRESSURE IN HPA ****** ****** 1012.9 1010.5 1013.5 1011.1 1008.3 1013.0 1015.5 1016.4 1017.2 1015.4 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1017.9 1017.1 1019.6 1016.0 1013.9 1017.1 1019.7 1022.8 1020.5 1021.5 ****** DAY ** ** 16 25 20 2 15 9 14 4 28 31 MIN. QNH PRESSURE IN HPA ****** ****** 1004.2 997.6 1008.7 1005.5 1002.9 1008.1 1011.9 1004.5 1012.6 1008.2 ****** DAY ** ** 23 3 2 23 10 1 23 25 9 24 MEAN QFF PRESSURE IN HPA ****** ****** 1010.0 1004.7 1001.5 996.4 991.9 997.3 1003.4 1008.3 1013.2 1016.3 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1020.2 1013.5 1009.9 1002.6 998.2 1003.3 1011.2 1019.2 1018.2 1029.1 ****** DAY ** ** 16 9 4 1 16 9 29 29 29 22 MIN. QFF PRESSURE IN HPA ****** ****** 1001.8 993.1 996.9 990.0 986.6 991.6 998.8 995.8 1008.3 1009.1 ****** DAY ** ** 22 3 29 23 10 1 18 24 16 17 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 824.0 822.0 824.7 822.8 820.5 824.3 826.3 826.8 827.9 826.2 ****** MAX. QFE PRESSURE IN HPA ****** ****** 828.4 827.4 830.6 827.2 824.9 828.1 830.2 832.1 830.8 830.1 ****** DAY ** ** 6 24 20 2 15 9 14 4 28 5 MIN. QFE PRESSURE IN HPA ****** ****** 816.8 811.8 818.9 817.8 815.7 820.1 823.7 816.1 824.3 820.2 ****** DAY ** ** 23 3 1 23 10 1 11 24 9 24 MEAN QNH PRESSURE IN HPA ****** ****** 1012.7 1010.4 1013.6 1011.3 1008.6 1013.2 1015.4 1016.0 1017.4 1015.4 ****** MAX. QNH PRESSURE IN HPA ****** ****** 1017.9 1016.8 1020.5 1016.5 1013.8 1017.6 1020.1 1022.3 1020.8 1019.9 ****** DAY ** ** 6 24 20 2 15 9 14 4 28 5 MIN. QNH PRESSURE IN HPA ****** ****** 1004.2 998.3 1006.7 1005.4 1002.9 1008.1 1012.4 1003.4 1013.1 1008.2 ****** DAY ** ** 23 3 1 23 10 1 11 24 9 24 MEAN QFF PRESSURE IN HPA ****** ****** 1008.6 1003.7 1000.8 995.9 991.3 996.3 1001.8 1007.0 1011.5 1014.5 ****** MAX. QFF PRESSURE IN HPA ****** ****** 1018.6 1012.6 1009.0 1002.3 997.0 1002.4 1008.8 1018.4 1016.2 1026.6 ****** DAY ** ** 16 9 4 1 16 9 29 29 29 22 MIN. QFF PRESSURE IN HPA ****** ****** 999.5 992.6 996.2 989.1 984.5 990.7 996.9 992.1 1006.4 1005.6 ****** DAY ** ** 12 3 11 23 10 1 11 24 6 17 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1966 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 6.4 5.6 8.5 13.2 19.0 25.8 26.9 26.8 22.3 14.1 8.4 5.2 15.2 MINIMUN AIR TEMPERATURE (C) 1.8 1.0 3.3 7.0 12.2 17.2 18.9 18.8 15.0 8.9 2.3 0.6 8.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 2 4 5 0 0 0 0 11 DAYS WITH MINIMUM TEMP. <=-4 0 0 0 0 0 0 0 0 0 0 0 3 3 DAYS WITH FREEZING MIN.<= 0 8 11 9 0 0 0 0 0 0 0 8 17 53 TEMPERATURE RECORDS LOWEST(C) -3.0 -2.0 -3.0 2.0 6.0 13.0 15.0 16.0 11.0 6.0 -3.0 -5.0 -5.0 DAY 17 11 24 1 8 17 7 19 20 18 25 29 MAXIMUM AIR TEMPERATURE (C) 13.1 12.1 15.5 20.7 26.4 34.5 35.5 36.1 30.9 21.9 17.9 12.3 23.1 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 7 30 31 31 23 0 0 0 122 DAYS WITH MAXIMUM TEMP. <= 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TEMPERATURE RECORDS HIGHEST(C) 17.0 21.0 22.0 28.0 33.0 37.0 39.0 38.0 35.0 28.0 22.0 18.0 39.0 DAY 3 26 7 20 24 24 25 13 10 1 1 9 DIF. BETWEEN (MAX.-MIN.) (C) 11.3 11.1 12.2 13.7 14.2 17.3 16.6 17.3 15.9 13.0 15.6 11.7 14.2 MEAN DAILY TEMP. (MDT) (C) 7.5 6.5 9.4 13.8 19.3 25.8 27.2 27.5 22.9 15.4 10.1 6.5 16.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 14.0 145.0 192.5 200.0 65.5 0.0 0.0 0.0 617.0 HEATING DEG. DAYS(BASE 18 0C) 327.0 321.0 267.0 127.0 20.5 0.0 0.0 0.0 0.0 89.0 237.5 358.0 1747.0 DEWPOINT (MEAN C) -1.4 -1.6 -2.4 1.3 3.0 3.5 6.0 5.0 4.3 6.2 -1.8 -4.8 1.5 MIXING RATIO (G/KG) 4.34 4.22 4.02 5.22 5.91 6.14 7.38 6.82 6.47 7.30 4.17 3.33 5.44 VAPOUR PRESSURE (HPA) 5.72 5.54 5.28 6.86 7.76 8.03 9.62 8.91 8.49 9.59 5.53 4.39 7.14 SATURATION DEF. (HPA) 4.21 3.83 6.43 9.04 15.26 26.66 27.49 28.09 19.86 7.19 6.11 4.86 13.25 RELATIVE HUMIDITY (MEAN %) 61 63 50 48 38 26 29 26 33 62 50 53 45 RELATIVE HUMIDITY (MAX. %) 77 81 71 69 56 38 41 38 47 78 63 69 61 RELATIVE HUMIDITY (MIN. %) 45 44 32 28 23 15 17 15 21 45 34 35 30 RELATIVE HUMIDITY (MEAN% 03UTC) 71 78 65 63 51 36 39 35 43 73 60 66 57 RELATIVE HUMIDITY (MEAN% 09UTC) 53 52 38 35 29 18 21 19 23 49 35 43 35 RELATIVE HUMIDITY (MEAN% 15UTC) 55 56 43 39 29 18 20 19 27 57 48 44 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 56.3 57.0 42.0 23.0 50.0 0.0 1.0 0.4 2.0 50.9 0.0 9.3 291.9 DAYS WITH PRECIPITATION >=10 1 2 1 1 3 0 0 0 0 1 0 0 9 DAYS WITH PRECIPITATION >= 5 3 3 3 1 3 0 0 0 0 3 0 0 16 DAYS WITH PRECIPITATION >= 1 8 7 10 8 5 0 1 0 2 8 0 4 53 DAYS WITH PRECIPITATION 9 7 10 9 6 0 2 1 2 8 0 5 59 GREATEST DAILY PRECIPITATION 32.0 29.0 16.0 11.0 21.0 0.0 1.0 0.4 1.0 28.0 0.0 3.0 32.0 DAY 31 2 1 22 6 ** 9 8 25 14 ** 20 DAY WITH THUNDER STORM 0 0 0 2 2 0 0 0 0 3 0 0 7 DAYS WITH SNOW OR SLEET 1 1 2 0 0 0 0 0 0 0 0 1 5 DAYS WITH DUST 0 0 1 3 1 2 4 1 1 0 0 0 13 WIND DIRECTION (PREVAILING) 180 180 270 225 180 180 360 180 225 225 270 180 180 PREVAILING WIND SPEED(KNOTS) 7.2 5.3 8.1 8.1 6.6 5.8 4.5 4.6 4.9 5.0 5.0 8.5 6.1 PREVAILING WIND PERCENT 7.3 9.0 14.2 11.3 10.1 7.1 4.5 4.9 6.7 1.6 0.8 8.5 5.6 CALMS PERCENT OF WIND 92.3 90.1 73.3 76.9 81.4 90.4 89.1 87.0 84.2 95.5 98.3 79.4 86.5 NO. OF WIND OBSERVATION 248 223 247 238 247 239 247 247 240 246 239 247 2908 VECTOR WIND DIRECTION (MEAN) 191 183 247 226 189 197 262 177 215 232 240 200 212 VECTOR WIND MAGNITUDE(KNOTS) 0.5 0.5 1.5 1.5 1.1 0.3 0.1 0.4 0.5 0.1 0.1 1.3 0.6 WIND STEADINESES (MEAN %) 83.3 100.0 78.9 88.2 84.6 50.0 20.0 66.7 62.5 50.0 100.0 81.2 66.7 WIND SPEED (MEAN KNOTS) 0.6 0.5 1.9 1.7 1.3 0.6 0.5 0.6 0.8 0.2 0.1 1.6 0.9 FASTEST WIND DIRECTION 190 180 270 200 150 190 180 140 350 230 200 190 270 FASTEST WIND SPEED (KNOTS) 17 15 20 15 20 12 8 10 14 7 5 15 20 DAY 3 3 20 13 16 14 16 12 1 25 7 12 DAYS WITH SKY CLEAR (0-2)/8 12 10 15 6 14 29 31 24 27 17 21 17 223 DAYS WITH P.CLOUDY (3-6)/8 9 10 9 15 12 1 0 7 3 9 8 6 89 DAYS WITH CLOUDY (7-8)/8 10 8 7 9 5 0 0 0 0 5 1 8 53 DAYS WITH VISIBILITY =< 2 KM 0 0 2 1 0 0 0 0 0 0 0 0 3 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1966 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 826.2 823.1 822.6 823.2 825.0 822.0 820.2 821.2 825.0 827.3 831.3 824.9 824.3 MAX. QFE PRESSURE IN HPA 833.3 830.5 831.6 830.1 829.1 829.3 826.5 825.9 828.8 832.5 837.1 834.0 837.1 DAY-HOUR 1- 6 12- 6 3- 6 26-21 10- 6 7- 6 11- 6 17- 6 16- 6 10- 6 23- 6 7- 6 MIN. QFE PRESSURE IN HPA 820.1 814.6 807.1 815.4 820.4 816.1 814.9 814.4 819.7 821.5 824.4 814.6 807.1 DAY-HOUR 30-12 2-15 19-15 13-15 31-15 27-12 16-15 5-12 13-12 25-12 30-12 18-12 MEAN QNH PRESSURE IN HPA 1015.4 1011.7 1011.1 1011.8 1013.9 1010.4 1008.3 1009.5 1013.9 1016.6 1021.4 1013.8 1013.1 MAX. QNH PRESSURE IN HPA 1023.7 1020.4 1021.7 1019.9 1018.8 1019.0 1015.7 1015.0 1018.4 1022.8 1028.2 1024.6 1028.2 DAY-HOUR 1- 6 12- 6 3- 6 26-21 10- 6 7- 6 11- 6 17- 6 16- 6 10- 6 23- 6 7- 6 MIN. QNH PRESSURE IN HPA 1008.1 1001.6 992.8 1002.6 1008.5 1003.4 1002.0 1001.4 1007.7 1009.8 1013.2 1001.6 992.8 DAY-HOUR 30-12 2-15 19-15 13-15 31-15 27-12 16-15 5-12 13-12 25-12 30-12 18-12 MEAN QFF PRESSURE IN HPA 1013.1 1010.0 1007.3 1004.6 1002.8 994.8 991.8 993.1 1000.5 1008.6 1017.9 1012.5 1004.7 MAX. QFF PRESSURE IN HPA 1023.4 1020.2 1022.8 1016.4 1010.0 1004.4 1000.6 1000.6 1007.2 1017.6 1027.1 1025.4 1027.1 DAY-HOUR 1- 6 12- 6 3- 6 5- 6 10- 3 7- 3 10- 3 17- 3 29-18 18- 3 23- 6 23- 6 MIN. QFF PRESSURE IN HPA 1003.2 999.7 988.4 995.9 995.7 986.6 984.1 984.0 992.2 998.8 1009.1 997.8 984.0 DAY-HOUR 30- 9 2-15 19-15 13-15 31-12 30-12 25-12 5-12 8-12 1-12 16-12 18-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 826.2 823.2 822.6 823.4 825.0 822.1 820.6 821.5 825.0 827.2 831.2 824.6 824.4 MAX. QFE PRESSURE IN HPA 831.6 828.5 829.5 830.1 827.3 828.5 825.4 825.0 828.2 831.5 835.8 833.0 835.8 DAY 2 13 3 27 25 7 11 18 16 10 23 8 MIN. QFE PRESSURE IN HPA 820.6 818.4 811.8 818.0 821.8 817.4 816.8 817.0 822.0 823.3 827.3 816.8 811.8 DAY 27 15 20 14 31 27 17 6 1 27 30 18 MEAN QNH PRESSURE IN HPA 1015.4 1011.8 1011.1 1012.0 1014.0 1010.5 1008.8 1009.8 1014.0 1016.6 1021.2 1013.5 1013.2 MAX. QNH PRESSURE IN HPA 1021.7 1018.1 1019.2 1019.9 1016.6 1018.1 1014.4 1013.9 1017.7 1021.6 1026.7 1023.4 1026.7 DAY 2 13 3 27 25 7 11 18 16 10 23 8 MIN. QNH PRESSURE IN HPA 1008.7 1006.1 998.3 1005.6 1010.1 1004.9 1004.2 1004.5 1010.4 1011.9 1016.6 1004.2 998.3 DAY 27 15 20 14 31 27 17 6 1 27 30 18 MEAN QFF PRESSURE IN HPA 1012.5 1009.5 1006.7 1004.5 1002.8 994.8 992.1 993.1 1000.1 1008.1 1016.9 1011.7 1004.4 MAX. QFF PRESSURE IN HPA 1020.4 1016.6 1019.0 1012.8 1007.2 1001.5 998.7 997.3 1004.7 1015.0 1023.7 1021.2 1023.7 DAY 2 12 3 5 10 7 10 18 22 23 23 23 MIN. QFF PRESSURE IN HPA 1003.3 1001.6 994.4 998.2 997.3 989.0 986.9 987.1 993.5 1000.9 1011.1 999.4 986.9 DAY 27 14 20 21 31 30 26 6 1 2 16 18 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 826.5 823.5 822.9 823.8 825.5 822.9 821.3 822.2 825.8 827.8 831.9 825.2 824.9 MAX. QFE PRESSURE IN HPA 832.4 829.5 830.0 830.1 828.1 829.2 825.9 825.7 828.5 832.1 836.4 832.8 836.4 DAY 1 12 3 27 10 7 11 18 22 10 23 7 MIN. QFE PRESSURE IN HPA 820.7 817.5 812.2 818.6 822.4 817.8 816.1 817.9 822.6 822.5 827.3 815.9 812.2 DAY 13 2 20 8 31 27 17 5 13 26 30 18 MEAN QNH PRESSURE IN HPA 1015.7 1012.1 1011.4 1012.5 1014.5 1011.4 1009.5 1010.6 1014.9 1017.2 1022.0 1014.2 1013.8 MAX. QNH PRESSURE IN HPA 1022.7 1019.2 1019.8 1019.9 1017.6 1018.9 1015.0 1014.8 1018.1 1022.3 1027.4 1023.1 1027.4 DAY 1 12 3 27 10 7 11 18 22 10 23 7 MIN. QNH PRESSURE IN HPA 1008.8 1005.1 998.8 1006.4 1010.8 1005.4 1003.4 1005.5 1011.1 1011.0 1016.6 1003.2 998.8 DAY 13 2 20 8 31 27 17 5 13 26 30 18 MEAN QFF PRESSURE IN HPA 1014.2 1011.4 1008.6 1006.3 1004.3 997.0 994.1 995.4 1002.8 1010.2 1020.0 1013.5 1006.5 MAX. QFF PRESSURE IN HPA 1022.9 1019.6 1021.1 1015.6 1010.0 1004.4 1000.6 1000.6 1006.9 1017.6 1027.0 1023.5 1027.0 DAY 1 12 3 5 10 7 10 17 27 18 23 23 MIN. QFF PRESSURE IN HPA 1004.6 1002.2 995.8 999.8 998.3 990.8 987.7 989.2 996.7 1003.3 1013.5 998.5 987.7 DAY 27 2 20 8 16 30 17 5 1 1 16 18 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1966 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 827.4 824.2 823.6 824.2 825.9 823.2 821.3 822.5 826.3 828.3 832.5 825.9 825.5 MAX. QFE PRESSURE IN HPA 833.3 830.5 831.6 830.0 829.1 829.3 826.5 825.9 828.8 832.5 837.1 834.0 837.1 DAY 1 12 3 26 10 7 11 17 16 10 23 7 MIN. QFE PRESSURE IN HPA 821.2 817.2 812.2 818.7 822.6 818.2 816.3 818.2 822.5 823.2 827.3 815.9 812.2 DAY 13 2 20 8 16 27 17 5 12 26 30 18 MEAN QNH PRESSURE IN HPA 1016.8 1013.0 1012.2 1013.0 1015.0 1011.9 1009.5 1011.0 1015.5 1017.9 1022.8 1015.0 1014.5 MAX. QNH PRESSURE IN HPA 1023.7 1020.4 1021.7 1019.8 1018.8 1019.0 1015.7 1015.0 1018.4 1022.8 1028.2 1024.6 1028.2 DAY 1 12 3 26 10 7 11 17 16 10 23 7 MIN. QNH PRESSURE IN HPA 1009.4 1004.7 998.8 1006.5 1011.1 1005.9 1003.6 1005.9 1011.0 1011.8 1016.6 1003.2 998.8 DAY 13 2 20 8 16 27 17 5 12 26 30 18 MEAN QFF PRESSURE IN HPA 1015.3 1011.8 1008.9 1005.9 1003.7 996.2 993.1 994.8 1002.2 1010.1 1020.3 1014.4 1006.4 MAX. QFF PRESSURE IN HPA 1023.4 1020.2 1022.8 1016.4 1009.9 1003.6 999.4 999.8 1007.2 1017.0 1027.1 1025.4 1027.1 DAY 1 12 3 5 10 7 8 16 27 31 23 23 MIN. QFF PRESSURE IN HPA 1005.8 1002.7 996.6 998.2 997.9 990.5 986.5 988.6 995.7 1002.1 1012.2 998.8 986.5 DAY 30 2 20 8 16 14 17 5 1 1 16 18 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 826.4 823.3 822.7 822.9 825.2 822.1 820.1 821.2 825.0 827.2 831.3 824.8 824.4 MAX. QFE PRESSURE IN HPA 832.4 829.3 830.1 829.0 828.4 828.4 824.7 825.0 827.5 831.1 836.0 833.1 836.0 DAY 1 12 3 26 10 6 11 17 15 23 23 7 MIN. QFE PRESSURE IN HPA 820.7 816.9 811.5 817.8 821.6 817.4 815.4 816.7 821.3 822.2 825.8 815.4 811.5 DAY 13 2 20 13 31 27 17 5 12 26 30 18 MEAN QNH PRESSURE IN HPA 1015.6 1011.9 1011.2 1011.4 1014.1 1010.5 1008.2 1009.5 1013.9 1016.5 1021.4 1013.7 1013.2 MAX. QNH PRESSURE IN HPA 1022.7 1019.0 1019.9 1018.7 1017.9 1017.9 1013.6 1013.9 1016.9 1021.1 1026.9 1023.5 1026.9 DAY 1 12 3 26 10 6 11 17 15 23 23 7 MIN. QNH PRESSURE IN HPA 1008.8 1004.3 998.0 1005.4 1009.9 1004.9 1002.6 1004.1 1009.6 1010.6 1014.9 1002.6 998.0 DAY 13 2 20 13 31 27 17 5 12 26 30 18 MEAN QFF PRESSURE IN HPA 1012.1 1009.3 1006.7 1003.1 1002.4 993.9 990.6 992.2 999.5 1007.5 1016.5 1011.6 1003.8 MAX. QFF PRESSURE IN HPA 1017.6 1016.2 1018.5 1010.5 1008.1 1001.1 996.4 997.3 1003.5 1014.5 1023.2 1022.8 1023.2 DAY 16 12 3 26 10 6 10 17 15 23 23 23 MIN. QFF PRESSURE IN HPA 1003.2 1002.9 995.6 998.0 995.8 988.3 984.4 986.1 993.9 1000.0 1009.8 998.8 984.4 DAY 30 14 20 21 31 30 17 5 8 2 16 18 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 825.1 821.9 821.3 822.1 824.1 820.7 818.7 819.7 823.6 826.1 830.0 823.8 823.1 MAX. QFE PRESSURE IN HPA 830.0 827.4 829.0 828.1 826.8 827.2 823.2 823.2 826.1 830.0 834.2 831.9 834.2 DAY 1 12 3 27 10 6 11 17 15 22 23 7 MIN. QFE PRESSURE IN HPA 820.1 815.2 808.6 817.4 820.6 816.1 815.0 814.4 819.7 821.5 824.4 814.6 808.6 DAY 30 2 19 13 31 27 17 5 13 25 30 18 MEAN QNH PRESSURE IN HPA 1014.1 1010.2 1009.5 1010.4 1012.8 1008.8 1006.4 1007.6 1012.2 1015.2 1019.9 1012.5 1011.6 MAX. QNH PRESSURE IN HPA 1019.8 1016.8 1018.7 1017.6 1016.0 1016.5 1011.8 1011.8 1015.2 1019.8 1024.8 1022.1 1024.8 DAY 1 12 3 27 10 6 11 17 15 22 23 7 MIN. QNH PRESSURE IN HPA 1008.1 1002.3 994.5 1004.9 1008.7 1003.4 1002.1 1001.4 1007.7 1009.8 1013.2 1001.6 994.5 DAY 30 2 19 13 31 27 17 5 13 25 30 18 MEAN QFF PRESSURE IN HPA 1011.2 1007.7 1005.0 1002.8 1001.6 992.9 989.7 990.8 998.3 1006.7 1015.5 1010.7 1002.7 MAX. QFF PRESSURE IN HPA 1018.6 1014.9 1016.2 1012.0 1006.7 1000.3 995.2 995.3 1002.4 1013.9 1022.2 1021.3 1022.2 DAY 1 12 3 5 10 6 11 17 27 22 23 23 MIN. QFF PRESSURE IN HPA 1003.5 1000.1 989.9 997.5 995.7 986.6 984.1 984.0 992.2 998.8 1009.1 997.8 984.0 DAY 30 2 19 20 31 30 25 5 8 1 16 18 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1966 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 825.5 822.5 821.9 822.4 824.0 820.6 818.6 819.6 823.8 826.4 830.6 824.4 823.4 MAX. QFE PRESSURE IN HPA 830.3 828.3 828.6 828.5 826.3 826.9 822.6 823.1 826.4 830.2 835.2 832.8 835.2 DAY 1 12 3 26 10 6 10 17 29 22 23 7 MIN. QFE PRESSURE IN HPA 820.8 814.6 807.1 815.4 820.4 816.1 814.9 814.4 820.3 821.5 824.9 815.7 807.1 DAY 30 2 19 13 31 27 16 5 13 25 30 18 MEAN QNH PRESSURE IN HPA 1014.6 1011.0 1010.3 1010.9 1012.7 1008.8 1006.4 1007.6 1012.5 1015.6 1020.5 1013.2 1012.0 MAX. QNH PRESSURE IN HPA 1020.2 1017.8 1018.2 1018.1 1015.5 1016.2 1011.1 1011.7 1015.6 1020.1 1026.0 1023.1 1026.0 DAY 1 12 3 26 10 6 10 17 29 22 23 7 MIN. QNH PRESSURE IN HPA 1009.0 1001.6 992.8 1002.6 1008.5 1003.4 1002.0 1001.4 1008.4 1009.8 1013.8 1002.9 992.8 DAY 30 2 19 13 31 27 16 5 13 25 30 18 MEAN QFF PRESSURE IN HPA 1013.0 1010.1 1007.3 1004.5 1002.5 994.2 990.9 992.3 1000.3 1008.5 1018.3 1012.5 1004.5 MAX. QFF PRESSURE IN HPA 1020.4 1017.7 1018.6 1013.2 1007.8 1001.5 996.3 997.2 1005.4 1014.4 1026.0 1023.1 1026.0 DAY 1 12 2 5 9 6 9 17 29 17 23 23 MIN. QFF PRESSURE IN HPA 1005.0 999.7 988.4 995.9 996.6 988.6 985.6 984.7 994.5 1001.4 1010.3 999.8 984.7 DAY 30 2 19 13 31 27 24 5 8 1 16 18 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 826.2 823.1 822.9 823.5 825.0 821.9 820.5 821.5 825.3 827.7 831.3 825.1 824.5 MAX. QFE PRESSURE IN HPA 831.2 828.8 829.1 829.6 827.6 828.4 824.8 824.8 828.6 831.4 836.0 833.6 836.0 DAY 1 12 2 26 10 6 10 16 29 22 22 7 MIN. QFE PRESSURE IN HPA 820.2 817.0 809.9 817.0 821.2 817.0 816.2 816.7 821.5 823.5 824.8 817.7 809.9 DAY 30 2 19 13 31 26 16 5 12 15 30 20 MEAN QNH PRESSURE IN HPA 1015.4 1011.7 1011.4 1012.2 1014.0 1010.3 1008.5 1009.7 1014.3 1017.1 1021.4 1014.0 1013.3 MAX. QNH PRESSURE IN HPA 1021.3 1018.4 1018.8 1019.4 1017.0 1017.9 1013.7 1013.7 1018.2 1021.5 1026.9 1024.1 1026.9 DAY 1 12 2 26 10 6 10 16 29 22 22 7 MIN. QNH PRESSURE IN HPA 1008.2 1004.5 996.1 1004.5 1009.4 1004.5 1003.5 1004.1 1009.8 1012.1 1013.7 1005.3 996.1 DAY 30 2 19 13 31 26 16 5 12 15 30 20 MEAN QFF PRESSURE IN HPA 1013.8 1010.4 1008.0 1005.0 1002.7 994.6 992.2 993.5 1001.0 1009.4 1018.8 1013.5 1005.2 MAX. QFF PRESSURE IN HPA 1020.3 1017.6 1019.8 1014.3 1008.0 1002.5 998.5 999.7 1007.2 1015.5 1025.5 1024.2 1025.5 DAY 1 12 2 5 10 6 9 16 29 31 22 23 MIN. QFF PRESSURE IN HPA 1004.9 1002.1 992.3 996.7 996.0 988.6 986.1 986.8 993.9 1001.1 1012.5 1000.9 986.1 DAY 30 28 19 13 31 29 16 5 8 1 17 11 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 826.6 823.6 823.2 823.9 825.6 822.5 820.8 821.8 825.5 827.8 831.7 825.2 824.8 MAX. QFE PRESSURE IN HPA 831.6 829.2 829.5 830.1 828.2 829.0 825.4 825.1 828.7 831.5 836.4 833.6 836.4 DAY 1 12 2 26 10 6 10 16 15 9 22 7 MIN. QFE PRESSURE IN HPA 820.2 818.4 811.3 818.0 822.1 817.2 816.8 817.5 822.1 823.7 828.9 818.7 811.3 DAY 30 14 19 13 6 26 16 4 8 26 16 18 MEAN QNH PRESSURE IN HPA 1015.8 1012.3 1011.8 1012.6 1014.6 1011.0 1009.0 1010.1 1014.5 1017.2 1021.9 1014.2 1013.7 MAX. QNH PRESSURE IN HPA 1021.7 1018.9 1019.2 1019.9 1017.7 1018.7 1014.4 1014.0 1018.3 1021.6 1027.4 1024.1 1027.4 DAY 1 12 2 26 10 6 10 16 15 9 22 7 MIN. QNH PRESSURE IN HPA 1008.2 1006.1 997.7 1005.6 1010.5 1004.7 1004.2 1005.1 1010.5 1012.4 1018.5 1006.5 997.7 DAY 30 14 19 13 6 26 16 4 8 26 16 18 MEAN QFF PRESSURE IN HPA 1012.7 1009.8 1007.2 1004.4 1003.0 994.5 991.6 992.8 1000.1 1008.4 1017.0 1012.0 1004.5 MAX. QFF PRESSURE IN HPA 1021.5 1016.0 1019.4 1012.5 1007.7 1001.8 997.9 997.4 1004.9 1014.6 1023.3 1023.4 1023.4 DAY 1 23 2 4 10 6 9 16 21 17 23 23 MIN. QFF PRESSURE IN HPA 1003.5 1004.0 994.1 997.8 998.2 988.5 985.9 986.8 993.6 1000.0 1010.4 1001.4 985.9 DAY 30 14 19 13 30 29 16 4 8 1 16 11 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1967 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 1.6 0.3 5.9 11.0 17.7 22.0 27.0 25.9 21.4 14.4 7.7 2.6 13.1 MINIMUN AIR TEMPERATURE (C) -3.0 -3.3 0.9 5.8 11.0 13.0 18.4 16.3 13.5 7.5 3.5 -1.7 6.8 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 3 0 0 0 0 0 3 DAYS WITH MINIMUM TEMP. <=-4 17 11 2 1 0 0 0 0 0 0 2 12 45 DAYS WITH FREEZING MIN.<= 0 24 25 11 2 0 0 0 0 0 0 6 20 88 TEMPERATURE RECORDS LOWEST(C) -11.0 -12.0 -5.0 -4.0 5.0 4.0 15.0 12.0 8.0 1.0 -5.0 -10.0 -12.0 DAY 23 3 1 2 1 6 28 29 26 24 29 24 MAXIMUM AIR TEMPERATURE (C) 9.0 6.0 13.1 18.0 25.0 30.3 35.5 35.1 29.7 22.7 13.9 8.7 20.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 1 19 31 31 13 0 0 0 95 DAYS WITH MAXIMUM TEMP. <= 0 1 1 0 0 0 0 0 0 0 0 0 1 3 TEMPERATURE RECORDS HIGHEST(C) 17.0 13.0 19.0 23.0 30.0 37.0 40.0 37.0 36.0 26.0 22.0 16.0 40.0 DAY 17 10 16 23 24 28 8 21 4 10 2 17 DIF. BETWEEN (MAX.-MIN.) (C) 12.0 9.3 12.2 12.2 14.0 17.3 17.1 18.8 16.2 15.2 10.4 10.4 13.8 MEAN DAILY TEMP. (MDT) (C) 3.0 1.3 7.0 11.9 18.0 21.7 27.0 25.7 21.6 15.1 8.7 3.5 13.7 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 1.0 42.5 185.0 145.0 41.0 0.0 0.0 0.0 414.5 HEATING DEG. DAYS(BASE 18 0C) 465.5 466.5 341.0 183.5 31.0 6.5 0.0 0.0 1.0 90.0 279.5 449.5 2314.0 DEWPOINT (MEAN C) -5.4 -4.9 -4.6 -0.7 2.7 -0.4 3.4 1.3 0.7 -0.0 0.2 -5.0 -1.1 MIXING RATIO (G/KG) 3.18 3.33 3.42 4.52 5.90 4.67 6.17 5.22 5.12 4.75 4.84 3.32 4.54 VAPOUR PRESSURE (HPA) 4.19 4.38 4.48 5.92 7.74 6.12 8.03 6.81 6.71 6.27 6.37 4.38 5.95 SATURATION DEF. (HPA) 3.09 2.12 5.25 7.88 13.46 21.86 29.30 28.49 20.27 10.97 4.73 3.44 12.57 RELATIVE HUMIDITY (MEAN %) 64 71 51 48 41 25 24 22 28 40 62 59 45 RELATIVE HUMIDITY (MAX. %) 81 85 75 66 63 43 39 36 43 58 78 74 62 RELATIVE HUMIDITY (MIN. %) 43 53 30 31 23 13 13 12 17 23 43 41 29 RELATIVE HUMIDITY (MEAN% 03UTC) 75 80 69 62 56 37 37 35 41 53 72 68 57 RELATIVE HUMIDITY (MEAN% 09UTC) 50 62 36 36 29 15 16 13 19 27 54 51 34 RELATIVE HUMIDITY (MEAN% 15UTC) 59 67 41 42 33 17 15 14 22 35 57 58 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 23.6 114.0 43.5 29.5 28.4 0.0 0.0 0.0 1.0 7.3 43.6 6.3 297.2 DAYS WITH PRECIPITATION >=10 0 4 2 1 0 0 0 0 0 0 1 0 8 DAYS WITH PRECIPITATION >= 5 4 9 2 1 3 0 0 0 0 0 5 0 24 DAYS WITH PRECIPITATION >= 1 5 12 7 6 5 0 0 0 1 4 9 3 52 DAYS WITH PRECIPITATION 7 12 11 9 7 0 0 0 2 6 9 5 68 GREATEST DAILY PRECIPITATION 6.0 31.0 16.0 19.0 9.0 0.0 0.0 0.0 1.0 2.0 13.0 4.0 31.0 DAY 30 12 8 5 14 ** ** ** 13 13 20 31 DAY WITH THUNDER STORM 0 0 1 1 1 0 0 0 1 0 0 0 4 DAYS WITH SNOW OR SLEET 6 12 6 1 0 0 0 0 0 0 2 2 29 DAYS WITH DUST 0 0 1 1 1 4 7 1 0 1 0 0 16 WIND DIRECTION (PREVAILING) 225 180 180 180 270 270 45 45 270 270 270 225 270 PREVAILING WIND SPEED(KNOTS) 5.9 9.4 6.5 6.1 8.9 7.0 7.5 8.5 6.9 6.9 7.4 9.1 7.6 PREVAILING WIND PERCENT 12.1 16.1 28.7 28.5 17.3 28.5 13.0 16.6 18.8 11.7 7.1 14.2 8.5 CALMS PERCENT OF WIND 84.6 77.1 68.8 67.8 72.6 66.1 68.4 70.9 58.2 74.1 82.5 72.1 71.9 NO. OF WIND OBSERVATION 247 223 247 239 248 239 247 247 239 247 240 247 2910 VECTOR WIND DIRECTION (MEAN) 234 196 188 194 253 256 73 66 267 258 243 247 224 VECTOR WIND MAGNITUDE(KNOTS) 0.8 1.9 2.0 1.9 1.8 1.7 1.2 1.8 0.9 1.1 0.7 2.4 0.9 WIND STEADINESES (MEAN %) 88.9 95.0 100.0 95.0 90.0 70.8 52.2 78.3 34.6 64.7 58.3 92.3 45.0 WIND SPEED (MEAN KNOTS) 0.9 2.0 2.0 2.0 2.0 2.4 2.3 2.3 2.6 1.7 1.2 2.6 2.0 FASTEST WIND DIRECTION 240 200 180 200 270 270 240 30 270 240 240 240 270 FASTEST WIND SPEED (KNOTS) 13 20 18 15 28 18 14 20 14 18 15 20 28 DAY 20 1 22 17 14 5 1 18 18 13 20 17 DAYS WITH SKY CLEAR (0-2)/8 20 9 15 8 14 28 30 30 27 18 12 15 226 DAYS WITH P.CLOUDY (3-6)/8 8 7 12 18 11 2 1 1 3 11 10 8 92 DAYS WITH CLOUDY (7-8)/8 3 12 4 4 6 0 0 0 0 2 8 8 47 DAYS WITH VISIBILITY =< 2 KM 0 6 1 0 2 1 0 0 0 0 1 2 13 DURATION OF SUNSHINE HOURS ****** ****** ****** ****** ****** ****** ****** 334.8 301.7 253.1 160.9 180.1 ****** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1967 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 825.2 821.5 820.0 821.1 824.1 821.1 818.1 819.7 822.8 828.1 825.6 823.7 822.6 MAX. QFE PRESSURE IN HPA 834.8 829.9 830.2 827.2 830.3 827.0 825.1 824.3 827.9 834.4 831.1 830.4 834.8 DAY-HOUR 13-21 28- 6 3- 6 7- 6 2- 6 2- 6 15- 3 16- 6 25- 6 15- 6 6- 6 12- 6 MIN. QFE PRESSURE IN HPA 814.9 812.6 810.4 812.6 819.2 813.8 813.1 814.6 816.8 820.0 818.0 809.8 809.8 DAY-HOUR 21-12 24-12 24-12 25-12 28- 9 19-12 27-12 18-12 7-12 2-12 24-18 23- 9 MEAN QNH PRESSURE IN HPA 1014.2 1009.7 1008.0 1009.3 1012.9 1009.3 1005.7 1007.6 1011.3 1017.6 1014.6 1012.4 1011.0 MAX. QNH PRESSURE IN HPA 1025.5 1019.7 1020.1 1016.5 1020.2 1016.3 1014.0 1013.1 1017.4 1025.0 1021.1 1020.3 1025.5 DAY-HOUR 13-21 28- 6 3- 6 7- 6 2- 6 2- 6 15- 3 16- 6 25- 6 15- 6 6- 6 12- 6 MIN. QNH PRESSURE IN HPA 1002.0 999.3 996.7 999.3 1007.1 1000.7 999.9 1001.6 1004.2 1008.0 1005.6 996.0 996.0 DAY-HOUR 21-12 24-12 24-12 25-12 28- 9 19-12 27-12 18-12 7-12 2-12 24-18 23- 9 MEAN QFF PRESSURE IN HPA 1015.6 1011.9 1005.9 1003.6 1002.5 996.3 989.2 992.0 998.5 1009.8 1011.2 1013.0 1004.1 MAX. QFF PRESSURE IN HPA 1027.7 1025.2 1019.9 1013.4 1012.8 1005.9 997.4 999.5 1007.7 1020.1 1020.6 1023.3 1027.7 DAY-HOUR 23- 6 3- 6 3- 6 2- 3 3- 0 8- 3 15- 3 29- 6 25- 6 15- 6 30-21 1- 3 MIN. QFF PRESSURE IN HPA 1001.7 996.7 994.8 991.5 994.0 986.4 982.6 985.4 987.4 997.9 1003.0 994.3 982.6 DAY-HOUR 21- 9 24-12 24-12 25-12 25- 9 19-12 10-12 18-12 7-12 2-12 24-18 23- 9 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 825.0 821.0 819.8 821.1 824.2 821.4 818.2 819.8 822.9 827.9 825.3 823.7 822.5 MAX. QFE PRESSURE IN HPA 831.9 828.2 827.6 825.3 829.7 825.3 823.7 822.4 826.8 832.4 830.0 829.9 832.4 DAY 14 28 3 12 3 2 15 16 15 29 6 12 MIN. QFE PRESSURE IN HPA 818.5 814.4 812.0 813.5 819.7 815.6 814.7 816.6 819.3 822.2 819.7 814.5 812.0 DAY 21 15 25 25 31 20 11 19 7 2 25 23 MEAN QNH PRESSURE IN HPA 1013.9 1009.2 1007.8 1009.3 1013.0 1009.7 1005.9 1007.8 1011.4 1017.4 1014.3 1012.4 1011.0 MAX. QNH PRESSURE IN HPA 1022.1 1017.7 1017.0 1014.3 1019.5 1014.3 1012.4 1010.8 1016.0 1022.7 1019.8 1019.7 1022.7 DAY 14 28 3 12 3 2 15 16 15 29 6 12 MIN. QNH PRESSURE IN HPA 1006.2 1001.4 998.6 1000.3 1007.7 1002.8 1001.7 1004.0 1007.2 1010.6 1007.7 1001.5 998.6 DAY 21 15 25 25 31 20 11 19 7 2 25 23 MEAN QFF PRESSURE IN HPA 1014.7 1011.0 1005.3 1003.5 1002.7 996.6 989.3 991.8 998.1 1008.8 1010.2 1012.3 1003.7 MAX. QFF PRESSURE IN HPA 1024.6 1021.2 1018.7 1011.3 1012.8 1005.3 994.8 996.7 1003.7 1015.9 1017.4 1020.4 1024.6 DAY 23 28 1 2 3 7 14 30 15 15 29 12 MIN. QFF PRESSURE IN HPA 1003.7 1001.4 996.2 993.1 995.5 989.5 984.3 987.4 990.7 1000.2 1004.1 1000.8 984.3 DAY 19 24 23 25 31 20 25 19 7 1 25 23 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 825.6 821.5 820.4 821.6 824.4 822.0 819.1 820.6 823.6 828.5 825.8 823.9 823.1 MAX. QFE PRESSURE IN HPA 833.2 828.9 828.7 825.8 829.9 826.4 825.1 823.7 827.3 832.9 830.3 830.0 833.2 DAY 13 28 3 7 3 2 15 16 15 15 6 12 MIN. QFE PRESSURE IN HPA 817.5 815.0 812.6 813.0 819.5 816.6 815.6 817.3 819.5 822.7 820.1 813.4 812.6 DAY 21 15 25 25 31 19 10 19 7 2 25 23 MEAN QNH PRESSURE IN HPA 1014.6 1009.8 1008.5 1009.9 1013.3 1010.4 1007.0 1008.7 1012.2 1018.0 1014.9 1012.6 1011.7 MAX. QNH PRESSURE IN HPA 1023.6 1018.5 1018.3 1014.9 1019.7 1015.6 1014.0 1012.4 1016.6 1023.3 1020.2 1019.8 1023.6 DAY 13 28 3 7 3 2 15 16 15 15 6 12 MIN. QNH PRESSURE IN HPA 1005.1 1002.1 999.3 999.7 1007.4 1004.0 1002.8 1004.8 1007.4 1011.2 1008.1 1000.2 999.3 DAY 21 15 25 25 31 19 10 19 7 2 25 23 MEAN QFF PRESSURE IN HPA 1016.8 1012.7 1007.5 1005.1 1003.7 998.0 991.1 993.9 1000.8 1011.4 1012.2 1014.2 1005.6 MAX. QFF PRESSURE IN HPA 1026.6 1024.2 1019.5 1013.4 1012.7 1005.9 997.4 999.4 1007.2 1018.9 1019.6 1023.3 1026.6 DAY 23 28 1 2 2 8 15 29 25 15 29 1 MIN. QFF PRESSURE IN HPA 1004.2 1001.0 998.0 992.4 995.9 990.4 986.5 989.3 993.3 1002.9 1004.7 998.8 986.5 DAY 21 24 25 25 31 19 10 19 7 11 25 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1967 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 826.4 822.5 821.3 822.2 824.9 822.2 819.3 821.1 824.2 829.4 826.7 824.9 823.8 MAX. QFE PRESSURE IN HPA 834.3 829.9 830.2 827.2 830.3 827.0 825.0 824.3 827.9 834.4 831.1 830.4 834.4 DAY 13 28 3 7 2 2 23 16 25 15 6 12 MIN. QFE PRESSURE IN HPA 817.5 816.3 813.5 813.9 820.0 816.5 815.6 817.7 819.3 823.3 821.1 812.0 812.0 DAY 21 15 25 25 31 20 10 19 7 2 20 23 MEAN QNH PRESSURE IN HPA 1015.6 1011.0 1009.5 1010.7 1013.8 1010.6 1007.2 1009.3 1013.0 1019.1 1016.0 1013.8 1012.5 MAX. QNH PRESSURE IN HPA 1024.9 1019.7 1020.1 1016.5 1020.2 1016.3 1013.9 1013.1 1017.4 1025.0 1021.1 1020.3 1025.0 DAY 13 28 3 7 2 2 23 16 25 15 6 12 MIN. QNH PRESSURE IN HPA 1005.1 1003.6 1000.3 1000.8 1008.0 1003.9 1002.8 1005.3 1007.2 1011.9 1009.3 998.6 998.6 DAY 21 15 25 25 31 20 10 19 7 2 20 23 MEAN QFF PRESSURE IN HPA 1018.0 1013.6 1007.8 1005.1 1003.5 997.4 990.7 993.7 1000.2 1011.6 1012.9 1014.9 1005.8 MAX. QFF PRESSURE IN HPA 1027.7 1025.2 1019.9 1013.1 1011.8 1005.4 996.4 999.5 1007.7 1020.1 1019.6 1023.0 1027.7 DAY 23 3 3 7 2 7 23 29 25 15 29 1 MIN. QFF PRESSURE IN HPA 1004.1 1001.1 998.5 993.3 994.9 989.3 985.8 990.0 991.6 1001.8 1007.3 996.3 985.8 DAY 21 24 25 25 31 19 10 5 7 11 25 23 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 825.0 821.8 820.1 821.2 824.0 821.0 818.1 819.7 822.7 828.1 825.5 823.6 822.6 MAX. QFE PRESSURE IN HPA 832.4 829.0 829.2 825.9 829.2 825.9 823.9 823.1 826.6 832.7 829.9 828.8 832.7 DAY 13 28 3 7 2 2 15 16 25 15 6 16 MIN. QFE PRESSURE IN HPA 815.6 814.1 812.8 813.8 819.2 815.1 814.7 816.0 817.8 821.5 820.2 809.8 809.8 DAY 21 24 25 25 28 19 10 19 7 2 20 23 MEAN QNH PRESSURE IN HPA 1013.9 1010.2 1008.1 1009.4 1012.7 1009.2 1005.7 1007.6 1011.2 1017.6 1014.6 1012.2 1011.0 MAX. QNH PRESSURE IN HPA 1022.7 1018.7 1018.9 1015.0 1018.9 1015.0 1012.6 1011.7 1015.8 1023.0 1019.7 1018.4 1023.0 DAY 13 28 3 7 2 2 15 16 25 15 6 16 MIN. QNH PRESSURE IN HPA 1002.8 1001.0 999.5 1000.7 1007.1 1002.2 1001.7 1003.3 1005.4 1009.8 1008.2 996.0 996.0 DAY 21 24 25 25 28 19 10 19 7 2 20 23 MEAN QFF PRESSURE IN HPA 1014.2 1011.6 1005.0 1002.8 1001.6 995.8 988.8 991.4 997.8 1009.2 1010.6 1012.2 1003.4 MAX. QFF PRESSURE IN HPA 1024.6 1022.0 1016.7 1009.7 1009.6 1004.5 994.8 996.2 1005.1 1016.7 1018.4 1021.1 1024.6 DAY 6 28 3 7 2 6 23 29 25 15 30 1 MIN. QFF PRESSURE IN HPA 1001.7 997.5 997.1 993.5 994.0 987.0 984.6 987.0 989.2 998.4 1005.7 994.3 984.6 DAY 21 24 25 25 25 19 10 18 7 2 24 23 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 824.0 820.4 818.7 819.7 823.1 819.8 816.6 818.1 821.2 826.8 824.5 822.6 821.3 MAX. QFE PRESSURE IN HPA 831.3 827.3 828.4 824.3 827.7 824.6 822.3 821.6 824.5 831.7 830.0 828.1 831.7 DAY 13 27 3 7 2 2 23 16 25 15 6 11 MIN. QFE PRESSURE IN HPA 814.9 812.6 810.4 812.6 819.6 813.8 813.1 814.6 816.8 820.0 819.5 811.2 810.4 DAY 21 24 24 25 6 19 27 18 7 2 19 23 MEAN QNH PRESSURE IN HPA 1012.7 1008.4 1006.4 1007.7 1011.7 1007.8 1004.0 1005.8 1009.4 1016.1 1013.3 1011.1 1009.5 MAX. QNH PRESSURE IN HPA 1021.4 1016.6 1017.9 1013.1 1017.1 1013.5 1010.7 1009.9 1013.3 1021.8 1019.8 1017.6 1021.8 DAY 13 27 3 7 2 2 23 16 25 15 6 11 MIN. QNH PRESSURE IN HPA 1002.0 999.3 996.7 999.3 1007.5 1000.7 999.9 1001.6 1004.2 1008.0 1007.4 997.6 996.7 DAY 21 24 24 25 6 19 27 18 7 2 19 23 MEAN QFF PRESSURE IN HPA 1013.4 1010.1 1003.9 1001.8 1001.3 994.6 987.3 989.8 996.1 1007.5 1009.4 1011.0 1002.2 MAX. QFF PRESSURE IN HPA 1023.3 1020.6 1015.5 1009.1 1011.1 1002.3 993.7 995.1 1002.9 1015.9 1016.3 1018.8 1023.3 DAY 6 3 3 2 2 6 23 29 25 15 30 1 MIN. QFF PRESSURE IN HPA 1002.2 996.7 994.8 991.5 995.0 986.4 982.6 985.4 987.4 997.9 1005.0 997.5 982.6 DAY 21 24 24 25 25 19 10 18 7 2 19 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1967 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 824.8 821.0 819.3 820.1 823.3 819.8 816.6 818.2 821.7 827.4 825.1 823.4 821.7 MAX. QFE PRESSURE IN HPA 833.0 828.2 829.2 823.3 827.7 824.5 821.7 821.5 825.0 832.3 830.0 828.8 833.0 DAY 13 27 3 6 2 2 14 15 14 15 6 16 MIN. QFE PRESSURE IN HPA 816.5 814.2 811.0 813.0 820.0 814.0 813.1 814.6 817.3 820.8 820.3 815.2 811.0 DAY 21 14 24 25 18 19 27 18 7 2 24 23 MEAN QNH PRESSURE IN HPA 1013.6 1009.2 1007.2 1008.1 1011.9 1007.8 1004.0 1005.9 1010.0 1016.8 1014.1 1012.0 1010.0 MAX. QNH PRESSURE IN HPA 1023.4 1017.7 1018.9 1011.9 1017.1 1013.3 1010.0 1009.8 1013.9 1022.5 1019.8 1018.4 1023.4 DAY 13 27 3 6 2 2 14 15 14 15 6 16 MIN. QNH PRESSURE IN HPA 1003.9 1001.2 997.4 999.7 1008.0 1000.9 999.9 1001.6 1004.8 1009.0 1008.4 1002.3 997.4 DAY 21 14 24 25 18 19 27 18 7 2 24 23 MEAN QFF PRESSURE IN HPA 1015.7 1012.1 1006.0 1003.1 1002.2 995.4 988.1 991.1 998.6 1010.1 1011.5 1013.5 1004.0 MAX. QFF PRESSURE IN HPA 1025.4 1023.2 1018.3 1011.3 1009.1 1004.1 993.8 997.5 1005.2 1018.7 1019.7 1020.9 1025.4 DAY 6 3 3 2 2 6 23 29 25 15 30 27 MIN. QFF PRESSURE IN HPA 1004.8 999.1 996.3 992.9 995.7 987.9 983.3 985.9 990.5 1001.3 1006.3 1002.5 983.3 DAY 17 24 24 25 28 19 10 18 7 1 24 3 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 825.4 821.8 820.3 821.3 824.3 821.1 818.2 819.9 822.9 828.4 825.8 823.9 822.8 MAX. QFE PRESSURE IN HPA 834.3 828.8 829.6 825.8 829.1 825.0 824.1 822.8 826.5 833.1 830.0 830.0 834.3 DAY 13 27 3 11 2 16 14 15 14 15 6 11 MIN. QFE PRESSURE IN HPA 817.2 814.7 812.0 813.8 820.0 815.3 814.5 816.7 819.4 821.6 818.0 816.2 812.0 DAY 21 14 24 25 30 19 10 18 6 2 24 3 MEAN QNH PRESSURE IN HPA 1014.4 1010.1 1008.3 1009.6 1013.1 1009.3 1005.9 1007.9 1011.5 1018.0 1014.9 1012.6 1011.3 MAX. QNH PRESSURE IN HPA 1024.9 1018.4 1019.4 1014.9 1018.8 1013.9 1012.9 1011.3 1015.7 1023.5 1019.8 1019.8 1024.9 DAY 13 27 3 11 2 16 14 15 14 15 6 11 MIN. QNH PRESSURE IN HPA 1004.7 1001.7 998.6 1000.7 1008.0 1002.5 1001.5 1004.1 1007.3 1009.9 1005.6 1003.5 998.6 DAY 21 14 24 25 30 19 10 18 6 2 24 3 MEAN QFF PRESSURE IN HPA 1016.7 1012.7 1006.6 1003.9 1002.7 996.0 989.4 992.3 998.8 1010.4 1012.0 1013.6 1004.6 MAX. QFF PRESSURE IN HPA 1026.5 1024.2 1018.9 1013.0 1009.6 1005.3 994.9 997.3 1004.0 1019.0 1019.5 1022.3 1026.5 DAY 22 3 3 1 1 6 14 29 25 15 28 11 MIN. QFF PRESSURE IN HPA 1005.6 1003.0 996.9 992.7 995.0 988.5 984.5 987.7 992.4 999.9 1003.0 1001.5 984.5 DAY 17 24 24 24 30 30 10 5 6 1 24 3 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 825.8 821.8 820.5 821.6 824.7 821.7 818.6 820.2 823.2 828.5 825.8 823.7 823.0 MAX. QFE PRESSURE IN HPA 834.8 829.2 829.6 826.3 829.7 825.3 824.1 822.8 826.8 833.5 830.0 829.9 834.8 DAY 13 27 3 11 2 1 14 15 14 15 5 11 MIN. QFE PRESSURE IN HPA 817.6 814.4 812.5 814.3 819.7 816.2 815.0 816.7 819.3 822.2 819.0 815.7 812.5 DAY 21 14 24 24 30 19 24 18 6 1 24 3 MEAN QNH PRESSURE IN HPA 1014.9 1010.2 1008.6 1009.9 1013.6 1010.0 1006.4 1008.2 1011.8 1018.1 1014.8 1012.4 1011.6 MAX. QNH PRESSURE IN HPA 1025.5 1018.9 1019.4 1015.5 1019.5 1014.3 1012.9 1011.3 1016.0 1024.0 1019.8 1019.7 1025.5 DAY 13 27 3 11 2 1 14 15 14 15 5 11 MIN. QNH PRESSURE IN HPA 1005.2 1001.4 999.1 1001.3 1007.7 1003.5 1002.1 1004.1 1007.2 1010.6 1006.8 1002.9 999.1 DAY 21 14 24 24 30 19 24 18 6 1 24 3 MEAN QFF PRESSURE IN HPA 1015.4 1011.7 1005.7 1003.6 1002.5 996.5 989.4 991.8 998.2 1009.5 1011.1 1012.5 1004.0 MAX. QFF PRESSURE IN HPA 1027.3 1022.7 1016.8 1013.0 1010.2 1005.6 994.4 997.6 1003.7 1017.8 1020.6 1021.3 1027.3 DAY 22 27 3 1 1 6 22 29 25 15 30 11 MIN. QFF PRESSURE IN HPA 1004.7 1002.8 996.6 991.8 994.5 988.6 984.0 987.3 991.2 999.6 1003.0 1000.3 984.0 DAY 17 23 22 24 30 19 24 5 6 2 24 3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1968 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 0.5 -2.9 6.9 10.7 16.0 22.1 25.8 25.5 21.4 16.0 8.4 4.2 12.9 MINIMUN AIR TEMPERATURE (C) -3.4 -7.0 2.2 5.9 10.3 13.9 16.9 17.1 12.9 9.0 4.3 0.3 6.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 3 2 0 0 0 0 5 DAYS WITH MINIMUM TEMP. <=-4 16 21 5 0 0 0 0 0 0 0 0 7 49 DAYS WITH FREEZING MIN.<= 0 24 24 11 1 0 0 0 0 0 0 0 16 76 TEMPERATURE RECORDS LOWEST(C) -12.0 -24.0 -7.0 0.0 5.0 10.0 12.0 11.0 8.0 3.0 1.0 -6.0 -24.0 DAY 27 7 24 6 1 10 13 31 20 29 6 30 MAXIMUM AIR TEMPERATURE (C) 5.8 2.5 12.6 16.7 22.6 30.0 34.0 33.9 30.3 24.2 14.6 9.8 19.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 15 31 30 20 0 0 0 96 DAYS WITH MAXIMUM TEMP. <= 0 4 12 0 0 0 0 0 0 0 0 0 0 16 TEMPERATURE RECORDS HIGHEST(C) 14.0 16.0 20.0 26.0 28.0 36.0 38.0 36.0 34.0 29.0 18.0 14.0 38.0 DAY 14 29 13 16 20 28 5 1 2 1 8 3 DIF. BETWEEN (MAX.-MIN.) (C) 9.2 9.5 10.4 10.8 12.3 16.1 17.1 16.8 17.4 15.2 10.3 9.5 12.9 MEAN DAILY TEMP. (MDT) (C) 1.2 -2.3 7.4 11.3 16.5 21.9 25.5 25.5 21.6 16.6 9.4 5.0 13.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 41.0 138.0 139.0 38.0 0.0 0.0 0.0 356.0 HEATING DEG. DAYS(BASE 18 0C) 520.0 587.5 328.5 202.5 56.0 0.0 0.0 0.0 1.5 64.5 257.0 401.5 2419.0 DEWPOINT (MEAN C) -6.3 -7.9 -4.0 1.0 5.2 3.7 1.7 0.7 -3.5 -1.5 2.5 -4.1 -1.0 MIXING RATIO (G/KG) 3.03 2.73 3.72 5.11 7.02 6.28 5.43 5.11 3.72 4.29 5.60 3.52 4.63 VAPOUR PRESSURE (HPA) 3.97 3.59 4.88 6.70 9.20 8.20 7.10 6.69 4.90 5.66 7.38 4.63 6.08 SATURATION DEF. (HPA) 2.76 1.89 5.62 6.97 9.57 19.77 27.86 27.69 22.14 13.72 3.95 3.89 12.15 RELATIVE HUMIDITY (MEAN %) 63 71 51 56 54 34 23 22 21 35 68 57 46 RELATIVE HUMIDITY (MAX. %) 79 83 71 76 74 55 37 36 33 51 86 76 63 RELATIVE HUMIDITY (MIN. %) 44 57 33 36 32 18 13 13 11 21 46 38 30 RELATIVE HUMIDITY (MEAN% 03UTC) 71 76 63 71 68 49 35 33 30 44 79 70 57 RELATIVE HUMIDITY (MEAN% 09UTC) 55 64 45 41 39 24 15 15 14 26 61 47 37 RELATIVE HUMIDITY (MEAN% 15UTC) 61 68 41 46 44 20 14 15 15 30 63 52 39 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 60.9 68.4 55.6 77.9 52.0 1.0 0.0 0.0 0.0 22.5 59.5 6.9 404.7 DAYS WITH PRECIPITATION >=10 2 4 2 1 2 0 0 0 0 1 2 0 14 DAYS WITH PRECIPITATION >= 5 3 5 3 6 3 0 0 0 0 2 6 0 28 DAYS WITH PRECIPITATION >= 1 7 7 9 11 10 1 0 0 0 3 10 2 60 DAYS WITH PRECIPITATION 9 7 9 12 15 1 0 0 0 4 11 12 80 GREATEST DAILY PRECIPITATION 26.0 16.0 25.0 24.0 17.0 1.0 0.0 0.0 0.0 12.0 10.2 2.0 26.0 DAY 7 3 29 23 14 3 ** ** ** 31 1 7 DAY WITH THUNDER STORM 0 0 0 2 11 2 0 0 0 0 3 1 19 DAYS WITH SNOW OR SLEET 7 7 3 0 0 0 0 0 0 0 0 2 19 DAYS WITH DUST 0 0 1 0 1 0 1 0 1 0 0 0 4 WIND DIRECTION (PREVAILING) 225 225 270 270 270 270 45 45 270 225 270 270 270 PREVAILING WIND SPEED(KNOTS) 11.0 6.9 11.0 6.6 6.9 7.6 6.8 6.2 6.5 7.0 5.9 7.7 8.1 PREVAILING WIND PERCENT 20.2 12.1 23.9 10.4 11.3 11.3 16.2 12.6 14.2 13.4 11.3 17.4 12.7 CALMS PERCENT OF WIND 56.7 76.2 49.0 71.3 67.2 67.4 66.8 61.9 59.0 68.0 76.2 68.0 65.5 NO. OF WIND OBSERVATION 247 231 247 240 247 239 247 247 239 247 239 247 2917 VECTOR WIND DIRECTION (MEAN) 246 249 249 241 276 271 42 341 263 254 246 247 254 VECTOR WIND MAGNITUDE(KNOTS) 4.1 1.5 3.4 1.2 1.0 0.7 1.0 0.4 1.0 1.2 1.4 2.3 1.4 WIND STEADINESES (MEAN %) 91.1 88.2 68.0 57.1 50.0 33.3 45.5 16.7 38.5 60.0 87.5 92.0 53.8 WIND SPEED (MEAN KNOTS) 4.5 1.7 5.0 2.1 2.0 2.1 2.2 2.4 2.6 2.0 1.6 2.5 2.6 FASTEST WIND DIRECTION 240 240 240 240 270 260 30 300 70 240 240 240 240 FASTEST WIND SPEED (KNOTS) 28 14 25 16 14 15 13 12 14 17 14 18 28 DAY 10 29 9 21 11 7 17 16 17 18 8 16 DAYS WITH SKY CLEAR (0-2)/8 14 7 15 5 9 27 26 27 30 24 12 13 209 DAYS WITH P.CLOUDY (3-6)/8 12 13 8 14 14 3 5 4 0 4 10 13 100 DAYS WITH CLOUDY (7-8)/8 5 9 8 11 8 0 0 0 0 3 8 5 57 DAYS WITH VISIBILITY =< 2 KM 4 9 1 0 0 0 0 0 0 1 2 0 17 DURATION OF SUNSHINE HOURS 171.3 142.5 214.7 195.2 259.5 367.4 348.0 312.2 316.2 268.1 170.0 175.3 2940.4 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1968 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 820.9 822.9 821.6 823.1 824.6 821.1 820.9 820.6 825.0 827.6 827.5 823.9 823.3 MAX. QFE PRESSURE IN HPA 829.1 830.4 829.7 827.7 829.2 828.1 826.4 826.0 829.4 834.9 833.4 831.4 834.9 DAY-HOUR 19- 6 5- 6 27- 6 16-18 23- 3 1-21 20- 6 27- 6 20- 6 16- 6 24- 6 20- 6 MIN. QFE PRESSURE IN HPA 811.9 807.6 812.1 812.4 819.8 813.8 814.5 815.3 819.6 820.6 821.3 816.3 807.6 DAY-HOUR 15-18 3- 0 10-12 24-12 30-12 22-15 10-12 2-12 6-12 25-12 1- 9 15-15 MEAN QNH PRESSURE IN HPA 1009.1 1011.5 1009.9 1011.7 1013.4 1009.4 1009.1 1008.8 1013.9 1017.0 1016.9 1012.6 1011.9 MAX. QNH PRESSURE IN HPA 1018.8 1020.3 1019.5 1017.1 1018.9 1017.6 1015.6 1015.1 1019.1 1025.6 1023.9 1021.5 1025.6 DAY-HOUR 19- 6 5- 6 27- 6 16-18 23- 3 1-21 20- 6 27- 6 20- 6 16- 6 24- 6 20- 6 MIN. QNH PRESSURE IN HPA 998.4 993.4 998.7 999.0 1007.8 1000.7 1001.5 1002.5 1007.5 1008.7 1009.6 1003.6 993.4 DAY-HOUR 15-18 3- 0 10-12 24-12 30-12 22-15 10-12 2-12 6-12 25-12 1- 9 15-15 MEAN QFF PRESSURE IN HPA 1011.2 1016.5 1007.2 1006.2 1004.1 996.0 993.5 993.4 1001.5 1008.1 1013.2 1011.9 1005.2 MAX. QFF PRESSURE IN HPA 1026.1 1036.1 1021.5 1013.3 1010.5 1006.9 1000.9 1002.1 1010.5 1017.1 1021.1 1024.6 1036.1 DAY-HOUR 19- 6 7- 6 27- 3 4-18 27-18 2- 6 20- 6 27- 6 20- 6 16- 6 24- 6 20- 6 MIN. QFF PRESSURE IN HPA 995.7 996.8 993.6 994.0 997.1 987.9 983.7 985.6 992.8 996.6 1005.5 1000.4 983.7 DAY-HOUR 15-18 3- 0 10-12 24- 0 30-12 22-15 10-12 2-12 5-21 4- 9 29- 0 15- 9 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 820.6 822.3 821.3 822.7 824.3 821.4 820.8 820.6 825.0 827.5 827.3 823.9 823.1 MAX. QFE PRESSURE IN HPA 827.4 828.3 828.4 826.2 828.5 827.4 824.5 825.2 828.6 833.1 832.0 830.1 833.1 DAY 20 5 27 13 23 2 20 30 19 17 24 19 MIN. QFE PRESSURE IN HPA 812.9 807.6 813.6 812.6 820.6 817.5 814.7 817.8 820.8 822.7 823.4 817.5 807.6 DAY 25 3 10 24 30 24 11 8 7 25 1 9 MEAN QNH PRESSURE IN HPA 1008.8 1010.7 1009.6 1011.2 1013.1 1009.7 1008.9 1008.7 1013.9 1016.9 1016.7 1012.6 1011.7 MAX. QNH PRESSURE IN HPA 1016.8 1017.8 1017.9 1015.3 1018.1 1016.8 1013.3 1014.2 1018.2 1023.5 1022.2 1019.9 1023.5 DAY 20 5 27 13 23 2 20 30 19 17 24 19 MIN. QNH PRESSURE IN HPA 999.6 993.4 1000.4 999.3 1008.7 1005.1 1001.7 1005.4 1009.0 1011.2 1012.0 1005.1 993.4 DAY 25 3 10 24 30 24 11 8 7 25 1 9 MEAN QFF PRESSURE IN HPA 1010.2 1015.3 1006.3 1005.5 1003.8 996.3 993.2 993.0 1000.9 1007.2 1012.2 1011.1 1004.6 MAX. QFF PRESSURE IN HPA 1022.1 1031.2 1019.3 1012.1 1007.5 1004.8 998.8 1000.7 1009.1 1015.1 1018.5 1021.5 1031.2 DAY 19 7 27 5 3 2 20 31 19 17 25 22 MIN. QFF PRESSURE IN HPA 999.5 996.8 995.8 994.0 999.0 991.2 984.9 986.8 994.1 1000.2 1005.5 1003.4 984.9 DAY 16 3 14 24 9 29 11 8 6 4 29 27 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 820.9 822.6 821.9 823.4 824.9 822.0 821.7 821.4 825.7 828.0 827.7 824.0 823.7 MAX. QFE PRESSURE IN HPA 827.2 829.0 828.9 827.0 829.2 827.6 825.5 825.4 828.9 833.7 832.2 829.9 833.7 DAY 19 5 27 13 23 2 20 29 19 16 24 22 MIN. QFE PRESSURE IN HPA 812.9 808.0 814.0 813.0 821.0 818.0 815.1 818.4 821.3 821.7 822.8 817.9 808.0 DAY 25 3 10 24 30 14 11 12 6 25 1 9 MEAN QNH PRESSURE IN HPA 1009.1 1011.1 1010.3 1012.0 1013.8 1010.4 1010.0 1009.7 1014.7 1017.5 1017.1 1012.7 1012.4 MAX. QNH PRESSURE IN HPA 1016.5 1018.7 1018.5 1016.3 1018.9 1017.0 1014.5 1014.4 1018.5 1024.2 1022.4 1019.7 1024.2 DAY 19 5 27 13 23 2 20 29 19 16 24 22 MIN. QNH PRESSURE IN HPA 999.6 993.8 1000.9 999.7 1009.2 1005.6 1002.2 1006.1 1009.6 1010.0 1011.3 1005.5 993.8 DAY 25 3 10 24 30 14 11 12 6 25 1 9 MEAN QFF PRESSURE IN HPA 1012.0 1016.9 1008.2 1007.3 1005.2 997.3 995.1 995.0 1003.3 1009.6 1014.0 1012.7 1006.4 MAX. QFF PRESSURE IN HPA 1025.0 1033.7 1021.5 1013.1 1009.6 1006.1 1000.6 1001.8 1010.4 1016.6 1019.7 1022.8 1033.7 DAY 19 7 27 5 3 2 20 27 19 16 24 21 MIN. QFF PRESSURE IN HPA 1000.9 997.7 997.3 996.8 1001.0 991.6 987.0 990.5 995.5 1000.7 1006.4 1004.6 987.0 DAY 16 3 10 24 9 29 11 12 6 4 1 27 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1968 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 822.0 824.0 823.0 824.2 825.6 822.3 822.2 822.0 826.5 828.9 828.7 825.3 824.6 MAX. QFE PRESSURE IN HPA 829.1 830.4 829.7 827.6 829.2 828.1 826.4 826.0 829.4 834.9 833.4 831.4 834.9 DAY 19 5 27 12 23 2 20 27 20 16 24 20 MIN. QFE PRESSURE IN HPA 813.4 811.8 813.7 815.1 821.6 818.2 816.4 818.4 822.0 821.7 822.3 819.2 811.8 DAY 16 3 10 24 30 23 11 2 6 25 1 9 MEAN QNH PRESSURE IN HPA 1010.4 1012.7 1011.6 1012.9 1014.6 1010.7 1010.6 1010.4 1015.7 1018.6 1018.3 1014.2 1013.4 MAX. QNH PRESSURE IN HPA 1018.8 1020.3 1019.5 1017.0 1018.9 1017.6 1015.6 1015.1 1019.1 1025.6 1023.9 1021.5 1025.6 DAY 19 5 27 12 23 2 20 27 20 16 24 20 MIN. QNH PRESSURE IN HPA 1000.2 998.3 1000.6 1002.2 1009.9 1005.9 1003.8 1006.1 1010.4 1010.0 1010.7 1007.1 998.3 DAY 16 3 10 24 30 23 11 2 6 25 1 9 MEAN QFF PRESSURE IN HPA 1013.1 1018.1 1009.3 1007.6 1005.2 997.3 994.8 994.9 1003.4 1010.0 1015.0 1014.0 1006.9 MAX. QFF PRESSURE IN HPA 1026.1 1036.1 1020.8 1013.3 1009.7 1006.9 1000.9 1002.1 1010.5 1017.1 1021.1 1024.6 1036.1 DAY 19 7 26 6 27 2 20 27 20 16 24 20 MIN. QFF PRESSURE IN HPA 1000.2 1002.3 996.7 997.8 1000.9 991.2 986.9 989.3 995.5 998.9 1006.1 1003.7 986.9 DAY 16 3 10 23 30 29 11 2 6 4 1 15 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 821.2 823.5 822.1 823.4 824.5 821.1 821.1 820.8 825.2 827.8 827.6 823.9 823.5 MAX. QFE PRESSURE IN HPA 828.3 829.7 828.5 827.1 827.7 826.7 825.3 825.0 828.5 833.9 832.5 829.8 833.9 DAY 19 5 26 11 3 2 20 29 20 16 24 20 MIN. QFE PRESSURE IN HPA 812.2 813.7 813.0 813.2 820.5 816.9 815.5 817.4 820.9 821.3 821.3 817.4 812.2 DAY 16 3 10 24 30 23 11 2 6 25 1 15 MEAN QNH PRESSURE IN HPA 1009.4 1012.1 1010.5 1012.0 1013.4 1009.3 1009.3 1009.0 1014.2 1017.2 1017.0 1012.6 1012.2 MAX. QNH PRESSURE IN HPA 1017.8 1019.5 1018.1 1016.4 1017.1 1015.9 1014.3 1013.9 1018.1 1024.4 1022.8 1019.6 1024.4 DAY 19 5 26 11 3 2 20 29 20 16 24 20 MIN. QNH PRESSURE IN HPA 998.8 1000.6 999.7 1000.0 1008.6 1004.3 1002.7 1004.9 1009.1 1009.6 1009.6 1004.9 998.8 DAY 16 3 10 24 30 23 11 2 6 25 1 15 MEAN QFF PRESSURE IN HPA 1010.7 1016.8 1007.3 1005.8 1003.6 995.7 993.5 993.3 1001.1 1007.6 1013.0 1011.5 1005.0 MAX. QFF PRESSURE IN HPA 1023.7 1034.0 1019.2 1012.1 1008.0 1004.7 1000.1 1000.0 1008.5 1015.5 1019.6 1021.3 1034.0 DAY 19 6 26 4 2 2 20 27 19 16 24 20 MIN. QFF PRESSURE IN HPA 998.6 1004.4 994.3 994.7 998.3 990.7 985.6 987.9 993.9 996.6 1005.9 1000.4 985.6 DAY 10 3 10 24 30 29 11 2 6 4 29 15 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 820.2 822.4 820.5 822.2 823.6 819.9 819.8 819.3 823.7 826.4 826.7 823.1 822.3 MAX. QFE PRESSURE IN HPA 827.1 828.5 826.8 825.9 826.4 825.6 823.7 823.6 827.0 832.4 831.2 829.6 832.4 DAY 19 5 26 11 2 2 20 27 18 16 24 20 MIN. QFE PRESSURE IN HPA 812.3 812.0 812.1 812.4 819.8 814.7 814.5 815.3 819.6 820.6 821.6 817.0 812.0 DAY 22 2 10 24 30 22 10 2 6 25 1 15 MEAN QNH PRESSURE IN HPA 1008.2 1010.8 1008.7 1010.6 1012.3 1007.9 1007.8 1007.2 1012.4 1015.5 1015.9 1011.6 1010.7 MAX. QNH PRESSURE IN HPA 1016.4 1018.1 1016.0 1015.0 1015.6 1014.6 1012.4 1012.3 1016.3 1022.7 1021.3 1019.4 1022.7 DAY 19 5 26 11 2 2 20 27 18 16 24 20 MIN. QNH PRESSURE IN HPA 998.9 998.6 998.7 999.0 1007.8 1001.7 1001.5 1002.5 1007.5 1008.7 1009.9 1004.5 998.6 DAY 22 2 10 24 30 22 10 2 6 25 1 15 MEAN QFF PRESSURE IN HPA 1009.6 1015.1 1005.4 1004.8 1003.0 994.5 992.0 991.5 999.4 1006.0 1011.3 1010.2 1003.6 MAX. QFF PRESSURE IN HPA 1022.0 1030.9 1016.9 1012.6 1006.9 1003.5 997.7 999.3 1006.5 1013.6 1017.1 1020.6 1030.9 DAY 19 6 26 27 2 2 19 27 18 31 24 20 MIN. QFF PRESSURE IN HPA 998.2 1001.9 993.6 994.9 997.1 988.3 983.7 985.6 993.1 998.6 1005.5 1001.5 983.7 DAY 22 2 10 24 30 22 10 2 6 4 1 15 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1968 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 820.8 822.7 820.9 822.4 823.9 819.8 819.6 819.4 823.9 826.7 827.0 823.5 822.5 MAX. QFE PRESSURE IN HPA 827.6 828.5 827.7 826.7 826.6 825.3 823.4 824.1 827.5 832.2 831.4 829.8 832.2 DAY 19 5 26 12 2 1 19 29 18 16 24 20 MIN. QFE PRESSURE IN HPA 813.2 811.2 812.8 812.4 820.1 813.8 814.5 815.7 820.2 821.1 822.8 816.3 811.2 DAY 22 2 10 24 30 22 10 2 7 25 1 15 MEAN QNH PRESSURE IN HPA 1008.9 1011.2 1009.0 1010.9 1012.6 1007.7 1007.5 1007.3 1012.6 1015.9 1016.3 1012.1 1011.0 MAX. QNH PRESSURE IN HPA 1017.0 1018.1 1017.1 1015.9 1015.8 1014.3 1012.0 1012.9 1016.9 1022.4 1021.5 1019.6 1022.4 DAY 19 5 26 12 2 1 19 29 18 16 24 20 MIN. QNH PRESSURE IN HPA 1000.0 997.6 999.5 999.0 1008.1 1000.7 1001.5 1002.9 1008.2 1009.3 1011.3 1003.6 997.6 DAY 22 2 10 24 30 22 10 2 7 25 1 15 MEAN QFF PRESSURE IN HPA 1011.7 1016.8 1007.0 1006.1 1004.0 994.7 992.6 992.7 1001.1 1008.0 1013.1 1012.2 1005.0 MAX. QFF PRESSURE IN HPA 1024.4 1032.4 1019.5 1012.4 1008.5 1003.2 998.7 1001.1 1008.5 1016.5 1018.7 1022.8 1032.4 DAY 19 6 26 27 27 1 19 27 18 30 24 20 MIN. QFF PRESSURE IN HPA 998.6 1000.9 995.6 995.6 998.3 987.9 985.2 987.7 995.4 999.7 1006.5 1001.7 985.2 DAY 15 2 14 24 30 22 10 12 5 4 1 15 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 821.1 823.1 821.8 823.5 825.1 821.3 821.1 820.9 825.1 827.8 827.7 824.1 823.6 MAX. QFE PRESSURE IN HPA 828.2 828.5 829.4 827.7 828.1 827.9 825.1 825.3 829.0 833.8 831.8 830.0 833.8 DAY 19 5 26 16 22 1 19 30 19 16 24 20 MIN. QFE PRESSURE IN HPA 811.9 809.7 813.6 814.8 822.0 816.2 814.9 817.6 821.3 822.2 823.4 818.4 809.7 DAY 15 2 9 24 30 22 10 2 5 26 1 15 MEAN QNH PRESSURE IN HPA 1009.3 1011.7 1010.2 1012.2 1014.1 1009.6 1009.3 1009.1 1014.0 1017.3 1017.2 1012.9 1012.2 MAX. QNH PRESSURE IN HPA 1017.7 1018.1 1019.1 1017.1 1017.6 1017.4 1014.0 1014.3 1018.7 1024.3 1022.0 1019.8 1024.3 DAY 19 5 26 16 22 1 19 30 19 16 24 20 MIN. QNH PRESSURE IN HPA 998.4 995.8 1000.4 1001.9 1010.4 1003.5 1002.0 1005.2 1009.6 1010.6 1012.0 1006.1 995.8 DAY 15 2 9 24 30 22 10 2 5 26 1 15 MEAN QFF PRESSURE IN HPA 1011.9 1016.9 1007.9 1006.7 1004.7 996.2 993.5 993.6 1001.7 1008.8 1013.8 1012.7 1005.7 MAX. QFF PRESSURE IN HPA 1024.5 1033.7 1021.3 1013.3 1010.5 1006.9 999.4 1001.1 1009.3 1016.9 1020.1 1023.1 1033.7 DAY 19 6 26 4 27 1 19 27 19 30 24 20 MIN. QFF PRESSURE IN HPA 995.7 999.2 997.0 996.7 999.2 990.5 985.3 988.5 993.7 1001.2 1008.2 1002.6 985.3 DAY 15 2 9 23 20 29 10 2 5 4 1 15 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 820.7 822.9 821.5 823.2 824.8 821.5 821.2 820.9 825.2 828.0 827.8 823.8 823.5 MAX. QFE PRESSURE IN HPA 828.0 828.5 828.6 827.2 828.8 828.1 824.7 825.3 829.0 833.5 831.7 829.8 833.5 DAY 19 5 26 16 22 1 19 27 19 16 24 23 MIN. QFE PRESSURE IN HPA 813.2 808.2 813.6 814.2 821.5 817.5 815.4 818.0 821.0 823.1 823.4 818.8 808.2 DAY 15 2 9 23 14 23 10 2 5 26 1 4 MEAN QNH PRESSURE IN HPA 1008.8 1011.5 1009.8 1011.8 1013.6 1009.7 1009.4 1009.1 1014.2 1017.5 1017.2 1012.5 1012.1 MAX. QNH PRESSURE IN HPA 1017.5 1018.1 1018.2 1016.5 1018.4 1017.6 1013.6 1014.3 1018.7 1024.0 1021.8 1019.6 1024.0 DAY 19 5 26 16 22 1 19 27 19 16 24 23 MIN. QNH PRESSURE IN HPA 1000.0 994.1 1000.4 1001.2 1009.8 1005.1 1002.6 1005.6 1009.2 1011.7 1012.0 1006.6 994.1 DAY 15 2 9 23 14 23 10 2 5 26 1 4 MEAN QFF PRESSURE IN HPA 1010.3 1015.9 1006.7 1005.7 1003.8 996.4 993.5 993.2 1000.9 1007.6 1013.1 1011.3 1004.9 MAX. QFF PRESSURE IN HPA 1022.6 1032.5 1019.5 1012.6 1007.8 1006.5 999.6 1001.1 1009.3 1015.9 1019.2 1021.2 1032.5 DAY 19 6 26 4 2 1 19 27 18 16 24 21 MIN. QFF PRESSURE IN HPA 998.7 997.4 995.5 994.8 999.6 991.1 985.4 988.3 992.8 998.8 1007.0 1003.4 985.4 DAY 15 2 9 23 20 29 10 2 5 3 1 26 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1969 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -4.3 -4.2 10.1 11.7 17.5 23.3 26.0 24.1 19.8 16.3 5.8 4.7 12.6 MINIMUN AIR TEMPERATURE (C) -8.7 -8.9 6.5 7.1 11.2 14.8 17.4 15.4 11.9 9.9 0.4 0.2 6.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 3 0 0 0 0 0 3 DAYS WITH MINIMUM TEMP. <=-4 24 19 0 0 0 0 0 0 0 0 8 5 56 DAYS WITH FREEZING MIN.<= 0 30 26 0 2 0 0 0 0 0 0 16 18 92 TEMPERATURE RECORDS LOWEST(C) -23.0 -26.0 1.0 -2.0 6.0 8.0 13.0 10.0 5.0 3.0 -7.0 -5.0 -26.0 DAY 28 5 24 14 7 1 12 29 14 31 17 3 MAXIMUM AIR TEMPERATURE (C) 1.3 1.9 14.9 17.6 24.4 30.9 34.6 32.4 28.2 24.3 13.4 11.3 19.6 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 2 24 29 26 12 1 0 0 94 DAYS WITH MAXIMUM TEMP. <= 0 12 12 0 0 0 0 0 0 0 0 0 0 24 TEMPERATURE RECORDS HIGHEST(C) 11.0 14.0 23.0 25.0 30.0 36.0 39.0 39.0 33.0 30.0 19.0 16.0 39.0 DAY 14 28 31 25 27 29 17 4 9 3 1 4 DIF. BETWEEN (MAX.-MIN.) (C) 10.0 10.8 8.4 10.5 13.2 16.1 17.2 17.0 16.3 14.4 13.0 11.1 13.2 MEAN DAILY TEMP. (MDT) (C) -3.7 -3.5 10.7 12.3 17.8 22.9 26.0 23.9 20.0 17.1 6.9 5.8 13.0 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 4.0 66.5 155.5 101.0 20.0 1.5 0.0 0.0 348.5 HEATING DEG. DAYS(BASE 18 0C) 672.5 602.5 226.5 172.5 38.0 2.0 0.0 0.5 18.0 56.0 332.5 379.5 2500.5 DEWPOINT (MEAN C) -7.7 -7.7 0.7 1.0 4.1 3.1 6.5 5.8 1.3 2.1 -2.7 -2.7 0.3 MIXING RATIO (G/KG) 2.80 2.92 5.04 5.27 6.38 5.95 7.64 7.15 5.18 5.53 3.97 3.90 5.14 VAPOUR PRESSURE (HPA) 3.68 3.84 6.60 6.90 8.36 7.78 9.94 9.35 6.81 7.28 5.23 5.15 6.74 SATURATION DEF. (HPA) 1.19 1.31 6.11 7.55 12.60 22.13 25.56 22.42 17.78 12.31 4.51 3.77 11.44 RELATIVE HUMIDITY (MEAN %) 78 78 56 52 45 29 31 34 32 43 57 62 50 RELATIVE HUMIDITY (MAX. %) 88 88 74 74 65 46 47 52 50 63 77 80 67 RELATIVE HUMIDITY (MIN. %) 64 65 36 33 27 17 19 20 19 24 35 42 33 RELATIVE HUMIDITY (MEAN% 03UTC) 83 84 67 64 60 42 43 49 47 56 72 73 62 RELATIVE HUMIDITY (MEAN% 09UTC) 72 68 48 41 33 21 23 22 21 31 42 54 40 RELATIVE HUMIDITY (MEAN% 15UTC) 78 78 49 46 35 20 22 24 24 37 50 58 43 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 266.3 36.4 99.6 72.6 45.0 2.6 0.0 3.1 0.5 24.2 13.0 43.3 606.6 DAYS WITH PRECIPITATION >=10 8 1 5 3 2 0 0 0 0 1 0 1 21 DAYS WITH PRECIPITATION >= 5 11 3 7 4 3 0 0 0 0 2 1 2 33 DAYS WITH PRECIPITATION >= 1 13 9 14 11 9 2 0 2 0 7 4 9 80 DAYS WITH PRECIPITATION 15 10 15 14 10 4 0 3 1 11 4 13 100 GREATEST DAILY PRECIPITATION 63.0 14.0 21.0 16.0 11.0 1.0 0.0 2.0 0.5 10.0 6.0 19.0 63.0 DAY 20 21 20 13 7 7 ** 28 17 27 3 27 DAY WITH THUNDER STORM 1 0 1 1 5 3 2 2 1 1 0 0 17 DAYS WITH SNOW OR SLEET 13 8 0 1 0 0 0 0 0 0 0 5 27 DAYS WITH DUST 0 0 0 0 0 1 0 0 0 0 0 0 1 WIND DIRECTION (PREVAILING) 270 270 225 225 270 270 45 45 270 270 225 270 270 PREVAILING WIND SPEED(KNOTS) 6.3 9.5 8.4 8.1 7.5 8.1 6.2 7.0 7.7 8.3 7.4 9.3 8.4 PREVAILING WIND PERCENT 4.9 7.2 31.2 16.7 18.2 18.0 20.2 18.6 9.6 19.0 6.3 10.1 12.1 CALMS PERCENT OF WIND 88.6 83.0 37.7 63.6 68.8 62.3 61.9 65.2 69.9 65.2 87.0 81.8 69.5 NO. OF WIND OBSERVATION 246 223 247 239 247 239 247 247 239 247 239 247 2907 VECTOR WIND DIRECTION (MEAN) 258 245 244 241 258 257 37 52 275 252 235 249 252 VECTOR WIND MAGNITUDE(KNOTS) 0.4 1.4 5.2 2.6 1.8 1.8 0.9 1.5 0.8 2.7 0.7 1.5 1.4 WIND STEADINESES (MEAN %) 50.0 87.5 92.9 86.7 81.8 64.3 39.1 60.0 36.4 90.0 77.8 93.8 58.3 WIND SPEED (MEAN KNOTS) 0.8 1.6 5.6 3.0 2.2 2.8 2.3 2.5 2.2 3.0 0.9 1.6 2.4 FASTEST WIND DIRECTION 240 240 180 260 270 250 280 60 240 260 210 250 180 FASTEST WIND SPEED (KNOTS) 20 22 30 22 17 18 14 17 18 20 12 15 30 DAY 23 13 11 13 19 15 2 9 10 28 1 31 DAYS WITH SKY CLEAR (0-2)/8 7 10 3 9 18 27 30 26 25 13 22 13 203 DAYS WITH P.CLOUDY (3-6)/8 9 10 11 9 11 3 1 5 5 15 7 11 97 DAYS WITH CLOUDY (7-8)/8 15 8 17 12 2 0 0 0 0 3 1 7 65 DAYS WITH VISIBILITY =< 2 KM 12 9 1 1 0 0 1 0 0 0 0 4 28 DURATION OF SUNSHINE HOURS 117.0 136.2 162.3 209.6 303.7 354.9 363.7 329.7 298.8 237.8 238.1 179.5 2931.3 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1969 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 822.4 823.7 821.5 822.1 824.0 822.1 819.8 822.8 825.3 826.5 827.0 825.4 823.6 MAX. QFE PRESSURE IN HPA 829.1 831.8 826.7 828.7 831.1 827.7 823.8 830.3 831.1 832.0 833.4 831.6 833.4 DAY-HOUR 1- 6 3- 6 2- 6 26-18 22- 6 3- 6 15- 6 31- 6 14- 6 10- 6 23- 6 22- 6 MIN. QFE PRESSURE IN HPA 811.9 814.0 813.4 811.0 818.4 816.5 814.8 816.7 818.3 817.8 820.5 817.6 811.0 DAY-HOUR 23-12 8-15 20-15 17-12 2-12 14-12 29-15 8-12 11-12 29- 0 8-12 31-15 MEAN QNH PRESSURE IN HPA 1010.8 1012.4 1009.8 1010.5 1012.7 1010.5 1007.8 1011.3 1014.3 1015.7 1016.3 1014.4 1012.2 MAX. QNH PRESSURE IN HPA 1018.8 1022.0 1015.9 1018.3 1021.1 1017.1 1012.5 1020.2 1021.1 1022.2 1023.9 1021.7 1023.9 DAY-HOUR 1- 6 3- 6 2- 6 26-18 22- 6 3- 6 15- 6 31- 6 14- 6 10- 6 23- 6 22- 6 MIN. QNH PRESSURE IN HPA 998.4 1000.9 1000.2 997.4 1006.1 1003.9 1001.9 1004.1 1006.0 1005.4 1008.6 1005.2 997.4 DAY-HOUR 23-12 8-15 20-15 17-12 2-12 14-12 29-15 8-12 11-12 29- 0 8-12 31-15 MEAN QFF PRESSURE IN HPA 1016.7 1018.5 1004.7 1004.3 1002.5 996.5 991.8 996.6 1002.7 1006.4 1014.6 1013.4 1005.7 MAX. QFF PRESSURE IN HPA 1032.4 1039.9 1013.8 1013.9 1013.1 1006.9 998.9 1009.7 1015.8 1013.3 1025.3 1023.9 1039.9 DAY-HOUR 9- 3 3-15 2- 6 15- 3 22- 3 2- 3 12- 6 31- 3 14- 3 31- 3 24- 6 18- 6 MIN. QFF PRESSURE IN HPA 997.5 1002.4 994.8 990.0 994.5 988.4 983.5 986.6 992.0 997.4 1002.7 1001.9 983.5 DAY-HOUR 23-12 8-21 22- 0 17-12 19- 6 15- 0 23-12 4-12 10-12 29- 0 8-21 24- 0 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 822.2 823.2 820.9 821.8 823.8 822.3 820.3 822.9 825.3 826.4 826.9 825.2 823.4 MAX. QFE PRESSURE IN HPA 827.4 830.0 825.2 826.7 830.0 826.6 822.7 829.4 829.9 830.4 832.3 829.9 832.3 DAY 9 3 25 27 22 2 16 31 14 10 24 10 MIN. QFE PRESSURE IN HPA 812.5 818.1 813.6 812.2 820.4 816.6 817.3 818.5 820.0 817.8 820.6 818.6 812.2 DAY 25 14 20 13 2 15 23 15 11 29 9 31 MEAN QNH PRESSURE IN HPA 1010.6 1011.8 1009.1 1010.1 1012.5 1010.7 1008.4 1011.4 1014.3 1015.6 1016.1 1014.2 1012.1 MAX. QNH PRESSURE IN HPA 1016.8 1019.8 1014.2 1015.9 1019.8 1015.8 1011.2 1019.1 1019.7 1020.3 1022.5 1019.7 1022.5 DAY 9 3 25 27 22 2 16 31 14 10 24 10 MIN. QNH PRESSURE IN HPA 999.1 1005.8 1000.4 998.8 1008.5 1004.0 1004.8 1006.2 1008.0 1005.4 1008.7 1006.4 998.8 DAY 25 14 20 13 2 15 23 15 11 29 9 31 MEAN QFF PRESSURE IN HPA 1016.1 1017.3 1003.5 1003.4 1002.3 996.8 992.1 996.4 1002.2 1005.7 1013.3 1012.5 1005.1 MAX. QFF PRESSURE IN HPA 1028.7 1035.5 1012.2 1012.8 1011.5 1006.7 998.2 1007.5 1013.1 1009.8 1022.3 1022.3 1035.5 DAY 9 5 25 15 22 2 12 31 14 31 23 18 MIN. QFF PRESSURE IN HPA 1002.8 1005.5 994.8 992.8 995.9 988.4 986.3 990.2 993.4 997.4 1003.2 1001.9 986.3 DAY 25 9 22 13 25 15 23 8 11 29 9 24 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 822.2 823.5 821.5 822.4 824.2 822.8 820.9 823.5 825.8 827.0 827.4 825.7 823.9 MAX. QFE PRESSURE IN HPA 827.6 830.2 825.7 827.1 830.6 827.0 823.0 829.7 830.5 831.0 832.6 830.2 832.6 DAY 1 3 25 23 22 2 16 31 14 10 24 10 MIN. QFE PRESSURE IN HPA 814.1 818.7 813.6 812.8 820.3 817.0 817.7 818.7 820.2 818.7 821.5 818.8 812.8 DAY 25 14 22 13 19 15 23 15 11 29 8 31 MEAN QNH PRESSURE IN HPA 1010.6 1012.2 1009.8 1010.9 1013.0 1011.4 1009.0 1012.1 1014.9 1016.3 1016.7 1014.7 1012.6 MAX. QNH PRESSURE IN HPA 1017.0 1020.1 1014.8 1016.4 1020.5 1016.3 1011.6 1019.5 1020.4 1021.0 1022.9 1020.1 1022.9 DAY 1 3 25 23 22 2 16 31 14 10 24 10 MIN. QNH PRESSURE IN HPA 1001.0 1006.5 1000.4 999.5 1008.4 1004.5 1005.3 1006.5 1008.2 1006.5 1009.8 1006.6 999.5 DAY 25 14 22 13 19 15 23 15 11 29 8 31 MEAN QFF PRESSURE IN HPA 1017.4 1019.6 1005.2 1005.1 1003.3 997.9 993.4 998.4 1004.5 1008.0 1016.0 1014.5 1006.9 MAX. QFF PRESSURE IN HPA 1032.4 1038.6 1013.6 1013.9 1013.1 1006.9 998.8 1009.7 1015.8 1013.3 1024.4 1022.7 1038.6 DAY 9 4 25 15 22 2 12 31 14 31 23 10 MIN. QFF PRESSURE IN HPA 1003.0 1007.6 995.8 994.7 995.9 989.5 988.1 991.4 994.0 999.6 1004.6 1003.8 988.1 DAY 23 14 22 13 19 15 23 5 11 29 2 24 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1969 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 823.4 824.8 822.7 823.1 824.8 823.2 821.0 824.0 826.6 828.0 828.3 826.7 824.7 MAX. QFE PRESSURE IN HPA 829.1 831.8 826.7 827.4 831.1 827.7 823.8 830.3 831.1 832.0 833.4 831.6 833.4 DAY 1 3 2 25 22 3 15 31 14 10 23 22 MIN. QFE PRESSURE IN HPA 814.8 819.7 814.3 813.2 819.5 817.9 817.3 819.0 820.2 820.2 822.1 819.4 813.2 DAY 23 13 22 13 19 15 19 15 11 29 9 31 MEAN QNH PRESSURE IN HPA 1012.1 1013.7 1011.2 1011.7 1013.6 1011.8 1009.2 1012.7 1015.8 1017.4 1017.8 1015.9 1013.6 MAX. QNH PRESSURE IN HPA 1018.8 1022.0 1015.9 1016.8 1021.1 1017.1 1012.5 1020.2 1021.1 1022.2 1023.9 1021.7 1023.9 DAY 1 3 2 25 22 3 15 31 14 10 23 22 MIN. QNH PRESSURE IN HPA 1001.9 1007.7 1001.3 1000.0 1007.4 1005.5 1004.8 1006.8 1008.2 1008.2 1010.5 1007.3 1000.0 DAY 23 13 22 13 19 15 19 15 11 29 9 31 MEAN QFF PRESSURE IN HPA 1018.3 1020.2 1006.5 1005.6 1003.3 997.7 993.3 998.0 1004.4 1008.4 1016.7 1015.5 1007.3 MAX. QFF PRESSURE IN HPA 1031.9 1038.1 1013.8 1013.7 1012.3 1006.0 998.9 1008.7 1015.1 1012.8 1025.3 1023.9 1038.1 DAY 9 3 2 15 22 2 12 31 14 1 24 18 MIN. QFF PRESSURE IN HPA 1003.4 1009.3 997.0 994.6 994.5 990.3 988.0 991.4 993.3 1001.1 1005.1 1005.3 988.0 DAY 23 20 22 2 19 15 23 4 11 29 9 24 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 822.6 824.4 822.0 822.3 824.0 822.1 819.9 822.7 825.4 826.6 827.1 825.5 823.7 MAX. QFE PRESSURE IN HPA 828.3 831.4 825.8 826.7 830.0 826.9 822.9 829.2 829.6 831.3 832.4 830.0 832.4 DAY 9 3 2 22 22 3 15 31 14 10 23 10 MIN. QFE PRESSURE IN HPA 812.7 817.5 813.9 812.9 819.5 817.5 816.3 818.0 819.3 818.9 821.4 818.0 812.7 DAY 23 8 22 13 2 14 19 15 11 29 8 31 MEAN QNH PRESSURE IN HPA 1011.1 1013.2 1010.4 1010.7 1012.8 1010.5 1007.9 1011.2 1014.4 1015.8 1016.4 1014.6 1012.4 MAX. QNH PRESSURE IN HPA 1017.8 1021.5 1014.9 1015.9 1019.8 1016.2 1011.4 1018.9 1019.4 1021.4 1022.7 1019.8 1022.7 DAY 9 3 2 22 22 3 15 31 14 10 23 10 MIN. QNH PRESSURE IN HPA 999.4 1005.1 1000.8 999.6 1007.4 1005.1 1003.6 1005.6 1007.2 1006.7 1009.7 1005.6 999.4 DAY 23 8 22 13 2 14 19 15 11 29 8 31 MEAN QFF PRESSURE IN HPA 1016.1 1018.4 1004.9 1004.3 1002.2 995.9 991.6 995.9 1001.9 1005.6 1014.3 1013.0 1005.3 MAX. QFF PRESSURE IN HPA 1029.7 1038.0 1012.2 1012.9 1011.0 1004.7 997.5 1006.5 1012.1 1010.8 1023.1 1022.5 1038.0 DAY 9 4 2 14 21 2 12 31 14 31 24 18 MIN. QFF PRESSURE IN HPA 1000.8 1005.9 995.0 994.3 995.2 989.3 986.3 988.9 992.2 998.9 1003.7 1004.1 986.3 DAY 23 20 22 17 19 14 23 4 11 29 8 31 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 821.8 823.0 820.7 821.0 823.2 820.9 818.3 821.4 824.1 825.4 826.0 824.4 822.5 MAX. QFE PRESSURE IN HPA 827.2 829.7 824.3 825.6 829.6 825.5 821.6 827.8 828.9 829.3 830.8 829.1 830.8 DAY 9 2 2 24 17 3 15 31 30 10 24 10 MIN. QFE PRESSURE IN HPA 811.9 814.4 813.5 811.0 818.4 816.5 815.1 816.7 818.3 818.6 820.5 818.0 811.0 DAY 23 8 20 17 2 14 29 8 11 29 8 31 MEAN QNH PRESSURE IN HPA 1010.1 1011.6 1008.9 1009.2 1011.9 1009.1 1006.0 1009.6 1012.9 1014.4 1015.1 1013.2 1011.0 MAX. QNH PRESSURE IN HPA 1016.5 1019.5 1013.1 1014.6 1019.4 1014.5 1009.9 1017.2 1018.5 1019.0 1020.8 1018.8 1020.8 DAY 9 2 2 24 17 3 15 31 30 10 24 10 MIN. QNH PRESSURE IN HPA 998.4 1001.4 1000.3 997.4 1006.1 1003.9 1002.2 1004.1 1006.0 1006.4 1008.6 1005.6 997.4 DAY 23 8 20 17 2 14 29 8 11 29 8 31 MEAN QFF PRESSURE IN HPA 1015.4 1016.7 1003.2 1002.6 1001.6 995.1 989.7 994.6 1000.7 1004.6 1012.4 1011.5 1004.0 MAX. QFF PRESSURE IN HPA 1027.0 1035.4 1010.0 1011.2 1009.9 1003.8 995.5 1005.6 1010.9 1008.9 1020.1 1021.0 1035.4 DAY 9 3 2 14 21 2 12 31 13 31 22 17 MIN. QFF PRESSURE IN HPA 997.5 1004.3 994.9 990.0 994.7 988.5 983.5 986.6 992.0 999.5 1003.4 1003.3 983.5 DAY 23 8 22 17 27 14 23 4 10 28 8 13 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1969 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 822.0 823.4 821.1 821.3 823.2 820.8 818.2 821.6 824.2 825.5 826.4 824.9 822.7 MAX. QFE PRESSURE IN HPA 827.8 830.4 824.8 825.6 828.8 825.2 821.0 827.8 828.9 829.3 831.0 829.4 831.0 DAY 9 2 2 24 21 3 15 31 30 10 22 10 MIN. QFE PRESSURE IN HPA 813.3 814.0 813.4 812.8 818.4 816.5 814.8 817.2 818.9 818.2 820.5 817.6 812.8 DAY 24 8 20 17 2 14 29 8 10 29 8 31 MEAN QNH PRESSURE IN HPA 1010.4 1012.0 1009.3 1009.6 1011.8 1009.0 1005.9 1009.9 1013.0 1014.5 1015.5 1013.8 1011.2 MAX. QNH PRESSURE IN HPA 1017.2 1020.3 1013.7 1014.6 1018.4 1014.2 1009.2 1017.2 1018.5 1019.0 1021.0 1019.1 1021.0 DAY 9 2 2 24 21 3 15 31 30 10 22 10 MIN. QNH PRESSURE IN HPA 1000.1 1000.9 1000.2 999.5 1006.1 1003.9 1001.9 1004.7 1006.7 1005.9 1008.6 1005.2 999.5 DAY 24 8 20 17 2 14 29 8 10 29 8 31 MEAN QFF PRESSURE IN HPA 1017.2 1019.0 1004.6 1003.9 1002.0 995.4 990.2 996.2 1002.5 1006.3 1014.8 1013.5 1005.5 MAX. QFF PRESSURE IN HPA 1032.1 1039.9 1011.2 1012.1 1010.6 1003.0 996.0 1007.2 1013.2 1010.7 1023.0 1021.2 1039.9 DAY 9 3 2 14 21 1 11 31 13 31 22 10 MIN. QFF PRESSURE IN HPA 1003.9 1004.6 996.2 993.7 996.0 988.5 985.0 988.0 994.1 999.9 1004.2 1004.2 985.0 DAY 23 28 20 17 19 13 23 4 10 28 8 13 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 822.5 823.9 821.9 822.7 824.3 822.1 819.9 823.1 825.4 826.6 827.1 825.3 823.7 MAX. QFE PRESSURE IN HPA 827.5 830.9 825.9 828.7 830.0 826.9 821.9 829.2 829.9 830.5 832.3 829.6 832.3 DAY 9 2 2 26 21 3 2 30 30 9 23 10 MIN. QFE PRESSURE IN HPA 813.2 815.6 815.5 814.0 820.6 816.8 816.9 818.9 819.9 817.9 821.0 818.2 813.2 DAY 24 8 20 12 2 14 29 8 10 29 8 31 MEAN QNH PRESSURE IN HPA 1011.0 1012.6 1010.3 1011.2 1013.1 1010.5 1007.9 1011.7 1014.4 1015.8 1016.5 1014.2 1012.4 MAX. QNH PRESSURE IN HPA 1016.9 1020.9 1015.0 1018.3 1019.8 1016.2 1010.3 1018.9 1019.7 1020.4 1022.5 1019.4 1022.5 DAY 9 2 2 26 21 3 2 30 30 9 23 10 MIN. QNH PRESSURE IN HPA 1000.0 1002.8 1002.7 1000.9 1008.7 1004.2 1004.3 1006.7 1007.9 1005.5 1009.2 1005.9 1000.0 DAY 24 8 20 12 2 14 29 8 10 29 8 31 MEAN QFF PRESSURE IN HPA 1017.4 1018.7 1005.5 1005.1 1002.7 996.3 992.1 997.1 1003.0 1006.7 1015.3 1013.8 1006.1 MAX. QFF PRESSURE IN HPA 1031.4 1039.3 1013.4 1013.6 1012.1 1005.7 997.0 1007.3 1013.4 1010.7 1024.1 1021.7 1039.3 DAY 9 3 24 14 21 1 11 31 13 31 23 10 MIN. QFF PRESSURE IN HPA 1003.5 1006.1 998.0 995.4 994.6 988.8 986.7 990.4 992.5 998.7 1004.3 1002.6 986.7 DAY 24 8 30 12 27 14 28 4 10 28 8 13 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 822.3 823.6 821.4 822.6 824.4 822.6 820.4 823.3 825.6 826.8 827.2 825.5 823.8 MAX. QFE PRESSURE IN HPA 827.4 830.2 825.6 828.3 830.5 827.4 822.7 829.4 830.1 831.2 832.6 829.6 832.6 DAY 8 2 24 26 21 2 15 30 13 9 23 10 MIN. QFE PRESSURE IN HPA 812.1 817.5 814.8 813.2 820.6 817.2 817.3 819.4 820.2 819.0 820.8 819.0 812.1 DAY 24 8 19 12 2 14 22 7 10 28 8 30 MEAN QNH PRESSURE IN HPA 1010.7 1012.3 1009.7 1011.1 1013.2 1011.1 1008.5 1011.9 1014.6 1016.1 1016.6 1014.5 1012.5 MAX. QNH PRESSURE IN HPA 1016.8 1020.1 1014.6 1017.8 1020.4 1016.8 1011.2 1019.1 1019.9 1021.3 1022.9 1019.4 1022.9 DAY 8 2 24 26 21 2 15 30 13 9 23 10 MIN. QNH PRESSURE IN HPA 998.7 1005.1 1001.9 1000.0 1008.7 1004.7 1004.8 1007.3 1008.2 1006.8 1009.0 1006.8 998.7 DAY 24 8 19 12 2 14 22 7 10 28 8 30 MEAN QFF PRESSURE IN HPA 1015.8 1017.9 1004.4 1004.5 1002.6 996.8 992.1 996.5 1002.1 1005.9 1014.3 1013.0 1005.5 MAX. QFF PRESSURE IN HPA 1028.7 1037.6 1012.8 1013.4 1012.4 1006.4 997.4 1006.8 1013.4 1010.2 1023.1 1020.4 1037.6 DAY 8 4 24 14 21 1 11 30 13 26 23 17 MIN. QFF PRESSURE IN HPA 1001.2 1002.4 996.8 993.1 994.9 989.4 986.2 990.0 992.5 998.2 1002.7 1003.5 986.2 DAY 24 8 21 12 27 14 28 7 10 28 8 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1970 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 1.2 5.4 7.9 14.4 19.0 24.6 26.2 26.2 20.6 15.7 11.1 2.5 14.6 MINIMUN AIR TEMPERATURE (C) -2.3 0.1 2.8 8.5 11.3 15.0 18.4 17.1 12.0 8.0 5.2 -1.6 7.9 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 4 1 0 0 0 0 5 DAYS WITH MINIMUM TEMP. <=-4 10 6 0 0 0 0 0 0 0 0 0 13 29 DAYS WITH FREEZING MIN.<= 0 26 13 10 0 0 0 0 0 0 0 2 21 72 TEMPERATURE RECORDS LOWEST(C) -10.0 -10.0 -3.0 3.0 5.0 9.0 16.0 14.0 6.0 1.0 0.0 -9.0 -10.0 DAY 29 8 7 21 2 11 3 20 13 24 16 16 MAXIMUM AIR TEMPERATURE (C) 6.6 12.2 14.5 21.7 26.7 33.5 34.4 35.5 30.3 24.6 18.7 8.5 22.3 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 9 27 31 31 18 4 0 0 120 DAYS WITH MAXIMUM TEMP. <= 0 1 0 0 0 0 0 0 0 0 0 0 0 1 TEMPERATURE RECORDS HIGHEST(C) 12.0 16.0 25.0 28.0 33.0 39.0 39.0 38.0 36.0 31.0 24.0 18.0 39.0 DAY 5 28 31 15 23 29 30 3 5 3 1 4 DIF. BETWEEN (MAX.-MIN.) (C) 8.9 12.1 11.7 13.2 15.4 18.5 16.0 18.4 18.3 16.6 13.5 10.1 14.4 MEAN DAILY TEMP. (MDT) (C) 2.1 6.1 8.6 15.1 19.0 24.2 26.4 26.3 21.1 16.3 11.9 3.5 15.1 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.5 22.5 102.5 167.5 165.0 40.5 3.0 0.0 0.0 501.5 HEATING DEG. DAYS(BASE 18 0C) 492.0 332.0 291.0 101.0 36.5 0.0 0.0 0.0 7.5 72.5 182.5 450.5 1965.5 DEWPOINT (MEAN C) -4.1 -5.2 -2.3 0.4 1.3 0.1 6.3 2.6 -0.2 -3.9 -2.1 -4.9 -1.0 MIXING RATIO (G/KG) 3.51 3.27 4.02 4.91 5.26 4.80 7.54 5.92 4.71 3.56 4.06 3.31 4.57 VAPOUR PRESSURE (HPA) 4.62 4.30 5.28 6.46 6.91 6.29 9.81 7.71 6.18 4.70 5.36 4.37 6.00 SATURATION DEF. (HPA) 2.21 5.08 6.03 11.00 16.64 26.52 25.82 28.10 19.97 14.41 8.38 3.39 13.96 RELATIVE HUMIDITY (MEAN %) 70 51 53 43 35 22 30 24 28 29 43 62 41 RELATIVE HUMIDITY (MAX. %) 84 74 72 61 52 35 46 38 44 44 60 79 57 RELATIVE HUMIDITY (MIN. %) 51 28 34 26 20 12 20 13 15 16 26 42 25 RELATIVE HUMIDITY (MEAN% 03UTC) 78 68 67 56 51 34 43 37 40 40 57 73 54 RELATIVE HUMIDITY (MEAN% 09UTC) 61 38 40 33 25 16 25 16 19 18 33 53 31 RELATIVE HUMIDITY (MEAN% 15UTC) 68 39 42 36 24 13 21 15 18 22 36 57 33 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 22.9 42.2 42.4 83.0 16.5 0.0 0.0 0.0 0.0 0.0 10.0 53.5 270.5 DAYS WITH PRECIPITATION >=10 0 1 2 3 0 0 0 0 0 0 0 3 9 DAYS WITH PRECIPITATION >= 5 1 3 2 3 2 0 0 0 0 0 1 3 15 DAYS WITH PRECIPITATION >= 1 7 4 8 6 4 0 0 0 0 0 2 5 36 DAYS WITH PRECIPITATION 10 4 10 9 6 0 0 0 0 1 3 5 48 GREATEST DAILY PRECIPITATION 7.0 26.2 15.0 40.0 7.0 0.0 0.0 0.0 0.0 0.0 8.0 25.0 40.0 DAY 22 6 11 23 1 ** ** ** ** ** 28 13 DAY WITH THUNDER STORM 0 0 0 5 1 1 0 0 0 0 0 0 7 DAYS WITH SNOW OR SLEET 6 1 4 1 0 0 0 0 0 0 0 4 16 DAYS WITH DUST 0 0 0 2 0 0 0 3 1 0 0 0 6 WIND DIRECTION (PREVAILING) 225 225 270 270 270 45 45 45 45 270 270 225 270 PREVAILING WIND SPEED(KNOTS) 7.4 6.7 6.9 10.3 10.5 6.7 7.0 8.3 6.5 8.7 7.2 7.9 8.6 PREVAILING WIND PERCENT 12.1 21.0 15.8 11.7 24.3 10.0 19.0 16.6 10.0 24.3 15.9 19.4 12.6 CALMS PERCENT OF WIND 80.6 59.8 67.6 69.9 63.6 71.3 66.0 64.0 76.6 57.5 71.5 65.6 67.8 NO. OF WIND OBSERVATION 247 224 247 239 247 240 247 247 239 247 239 247 2910 VECTOR WIND DIRECTION (MEAN) 246 248 252 248 264 290 39 54 40 259 254 247 258 VECTOR WIND MAGNITUDE(KNOTS) 1.4 2.8 1.5 1.9 3.0 0.5 1.1 0.8 0.5 2.4 1.5 2.5 1.3 WIND STEADINESES (MEAN %) 93.3 90.3 71.4 65.5 88.2 22.7 45.8 27.6 29.4 68.6 78.9 92.6 52.0 WIND SPEED (MEAN KNOTS) 1.5 3.1 2.1 2.9 3.4 2.2 2.4 2.9 1.7 3.5 1.9 2.7 2.5 FASTEST WIND DIRECTION 260 240 260 180 260 270 230 60 240 250 260 210 180 FASTEST WIND SPEED (KNOTS) 18 26 18 35 24 15 14 20 12 20 15 16 35 DAY 1 19 18 19 16 24 13 20 5 14 17 11 DAYS WITH SKY CLEAR (0-2)/8 7 15 10 9 22 30 26 31 30 28 11 17 236 DAYS WITH P.CLOUDY (3-6)/8 17 11 12 13 9 0 5 0 0 3 16 12 98 DAYS WITH CLOUDY (7-8)/8 7 2 9 8 0 0 0 0 0 0 3 2 31 DAYS WITH VISIBILITY =< 2 KM 5 5 2 2 0 1 0 0 0 0 0 1 16 DURATION OF SUNSHINE HOURS 148.4 208.6 221.3 227.4 334.6 370.7 339.4 346.2 316.4 292.2 204.5 190.5 3200.2 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1970 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 823.3 823.7 822.7 825.1 823.5 820.6 818.9 819.0 822.8 826.1 827.8 824.9 823.2 MAX. QFE PRESSURE IN HPA 831.3 829.3 828.8 831.2 829.6 824.6 823.4 825.7 829.2 832.4 833.7 834.6 834.6 DAY-HOUR 3- 6 3- 6 26- 6 13- 6 22- 6 27- 6 9- 6 29- 6 22- 6 12- 6 14-18 31- 6 MIN. QFE PRESSURE IN HPA 814.4 815.0 815.2 814.5 819.1 815.4 814.9 813.4 816.1 819.4 822.5 816.6 813.4 DAY-HOUR 22-12 23-12 19-15 19-18 30-15 30-15 1-12 16-15 11-12 8-12 30-15 13-12 MEAN QNH PRESSURE IN HPA 1011.9 1012.4 1011.1 1014.0 1012.2 1008.8 1006.7 1006.8 1011.4 1015.3 1017.3 1013.7 1011.8 MAX. QNH PRESSURE IN HPA 1021.4 1019.0 1018.4 1021.3 1019.4 1013.5 1012.0 1014.8 1018.9 1022.7 1024.2 1025.3 1025.3 DAY-HOUR 3- 6 3- 6 26- 6 13- 6 22- 6 27- 6 9- 6 29- 6 22- 6 12- 6 14-18 31- 6 MIN. QNH PRESSURE IN HPA 1001.4 1002.1 1002.3 1001.5 1006.9 1002.6 1002.0 1000.2 1003.4 1007.3 1011.0 1004.0 1000.2 DAY-HOUR 22-12 23-12 19-15 19-18 30-15 30-15 1-12 16-15 11-12 8-12 30-15 13-12 MEAN QFF PRESSURE IN HPA 1013.4 1010.9 1007.8 1006.0 1001.1 994.0 990.6 990.9 999.2 1006.6 1011.8 1014.4 1003.9 MAX. QFF PRESSURE IN HPA 1024.6 1024.6 1017.3 1014.0 1008.6 1002.6 997.9 1001.0 1009.6 1017.3 1021.5 1030.2 1030.2 DAY-HOUR 3- 6 8- 6 26- 3 26- 6 10- 6 11- 6 9- 3 29- 6 22- 3 27- 6 15- 6 31- 6 MIN. QFF PRESSURE IN HPA 1002.4 998.2 995.7 990.3 993.6 984.9 984.1 984.8 988.1 995.8 1004.4 1003.1 984.1 DAY-HOUR 22-12 19- 0 18-21 19- 9 30-12 30-12 1-12 6-12 5-12 8-12 9-12 13-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 823.2 823.6 822.3 825.0 823.5 820.8 819.0 819.3 823.0 826.0 827.8 824.6 823.2 MAX. QFE PRESSURE IN HPA 829.4 827.4 827.6 829.8 828.1 823.4 822.8 823.8 827.9 831.0 832.2 832.6 832.6 DAY 3 16 26 13 23 27 9 29 28 12 15 31 MIN. QFE PRESSURE IN HPA 816.3 816.8 816.8 817.6 820.3 817.7 816.7 816.3 818.2 820.2 824.2 819.2 816.3 DAY 23 19 19 19 31 30 5 7 11 9 28 11 MEAN QNH PRESSURE IN HPA 1011.7 1012.2 1010.8 1013.9 1012.1 1009.0 1006.9 1007.2 1011.5 1015.1 1017.2 1013.4 1011.8 MAX. QNH PRESSURE IN HPA 1019.1 1016.8 1017.0 1019.6 1017.6 1012.0 1011.3 1012.5 1017.4 1021.0 1022.4 1022.9 1022.9 DAY 3 16 26 13 23 27 9 29 28 12 15 31 MIN. QNH PRESSURE IN HPA 1003.6 1004.2 1004.2 1005.2 1008.4 1005.3 1004.1 1003.6 1005.9 1008.2 1013.0 1007.1 1003.6 DAY 23 19 19 19 31 30 5 7 11 9 28 11 MEAN QFF PRESSURE IN HPA 1012.6 1010.1 1007.0 1005.6 1000.9 993.9 990.4 990.7 998.5 1005.5 1010.8 1013.1 1003.3 MAX. QFF PRESSURE IN HPA 1021.3 1021.6 1015.0 1012.0 1006.3 1000.3 996.4 997.6 1007.2 1012.4 1018.7 1026.1 1026.1 DAY 4 8 26 26 1 12 9 29 22 12 15 16 MIN. QFF PRESSURE IN HPA 1004.3 998.2 995.7 991.4 994.8 987.3 986.4 986.9 991.2 997.5 1005.6 1004.2 986.4 DAY 23 19 19 19 31 30 1 7 9 6 9 9 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 823.2 823.9 822.8 825.3 824.0 821.5 819.7 819.9 823.5 826.5 828.2 824.8 823.6 MAX. QFE PRESSURE IN HPA 829.4 827.8 828.1 830.2 828.8 824.1 823.0 824.6 828.4 831.5 832.4 832.6 832.6 DAY 3 7 26 13 22 11 9 29 22 12 15 31 MIN. QFE PRESSURE IN HPA 817.0 816.4 817.4 817.0 820.9 818.4 817.1 816.8 818.6 821.0 824.9 819.2 816.4 DAY 23 19 19 19 16 30 5 7 11 9 28 11 MEAN QNH PRESSURE IN HPA 1011.8 1012.6 1011.3 1014.3 1012.8 1009.8 1007.6 1007.9 1012.1 1015.7 1017.7 1013.6 1012.3 MAX. QNH PRESSURE IN HPA 1019.1 1017.2 1017.6 1020.1 1018.4 1012.9 1011.6 1013.5 1017.9 1021.6 1022.7 1022.9 1022.9 DAY 3 7 26 13 22 11 9 29 22 12 15 31 MIN. QNH PRESSURE IN HPA 1004.5 1003.8 1004.9 1004.5 1009.1 1006.1 1004.6 1004.2 1006.4 1009.2 1013.8 1007.1 1003.8 DAY 23 19 19 19 16 30 5 7 11 9 28 11 MEAN QFF PRESSURE IN HPA 1013.9 1011.9 1008.6 1007.1 1002.5 995.7 992.2 992.8 1000.7 1008.0 1013.2 1015.0 1005.1 MAX. QFF PRESSURE IN HPA 1022.3 1022.3 1017.3 1013.6 1007.7 1002.6 997.9 999.5 1009.6 1014.9 1020.6 1027.4 1027.4 DAY 3 8 26 26 13 12 9 29 22 12 15 16 MIN. QFF PRESSURE IN HPA 1005.2 999.0 997.9 991.5 996.8 989.0 988.3 988.0 993.3 1000.1 1008.1 1005.0 988.0 DAY 22 19 19 19 27 30 1 7 6 8 28 11 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1970 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 824.3 824.8 824.1 826.1 824.5 822.0 820.2 820.5 824.2 827.5 829.3 826.2 824.5 MAX. QFE PRESSURE IN HPA 831.3 829.3 828.8 831.2 829.6 824.6 823.4 825.7 829.2 832.4 833.6 834.6 834.6 DAY 3 3 26 13 22 27 9 29 22 12 15 31 MIN. QFE PRESSURE IN HPA 817.8 816.5 818.1 816.5 821.7 818.8 817.4 817.3 819.2 822.0 825.4 819.3 816.5 DAY 27 19 19 19 7 30 5 16 11 8 28 13 MEAN QNH PRESSURE IN HPA 1013.1 1013.7 1012.8 1015.3 1013.4 1010.3 1008.3 1008.7 1013.0 1016.8 1018.9 1015.3 1013.3 MAX. QNH PRESSURE IN HPA 1021.4 1019.0 1018.4 1021.3 1019.4 1013.5 1012.0 1014.8 1018.9 1022.7 1024.1 1025.3 1025.3 DAY 3 3 26 13 22 27 9 29 22 12 15 31 MIN. QNH PRESSURE IN HPA 1005.4 1003.9 1005.8 1003.9 1010.0 1006.6 1004.9 1004.8 1007.1 1010.4 1014.4 1007.2 1003.9 DAY 27 19 19 19 7 30 5 16 11 8 28 13 MEAN QFF PRESSURE IN HPA 1015.1 1012.9 1010.0 1007.5 1002.4 995.8 992.3 992.9 1001.4 1008.8 1014.1 1016.8 1005.8 MAX. QFF PRESSURE IN HPA 1024.6 1024.6 1016.9 1014.0 1008.6 1002.6 996.8 1001.0 1009.5 1017.3 1021.5 1030.2 1030.2 DAY 3 8 25 26 10 11 9 29 22 27 15 31 MIN. QFF PRESSURE IN HPA 1007.0 999.5 999.3 991.0 994.9 989.0 987.5 988.8 992.5 999.3 1008.7 1007.8 987.5 DAY 27 19 19 19 29 30 1 16 1 8 28 13 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 823.3 824.0 823.2 825.1 823.6 820.9 819.0 819.1 822.9 826.3 828.1 825.1 823.4 MAX. QFE PRESSURE IN HPA 829.6 828.8 827.5 829.7 828.9 823.7 821.5 824.4 828.0 830.8 832.6 832.6 832.6 DAY 3 3 26 13 22 11 8 29 27 11 14 30 MIN. QFE PRESSURE IN HPA 816.8 816.7 817.5 815.4 820.9 817.6 816.5 815.9 818.0 820.5 825.0 818.8 815.4 DAY 22 23 19 19 6 30 1 16 1 8 27 13 MEAN QNH PRESSURE IN HPA 1011.9 1012.7 1011.8 1014.0 1012.2 1009.1 1006.9 1006.9 1011.4 1015.4 1017.6 1014.0 1012.0 MAX. QNH PRESSURE IN HPA 1019.4 1018.4 1016.9 1019.5 1018.5 1012.4 1009.8 1013.2 1017.5 1020.8 1022.9 1022.9 1022.9 DAY 3 3 26 13 22 11 8 29 27 11 14 30 MIN. QNH PRESSURE IN HPA 1004.2 1004.1 1005.1 1002.6 1009.1 1005.2 1003.9 1003.2 1005.6 1008.6 1013.9 1006.6 1002.6 DAY 22 23 19 19 6 30 1 16 1 8 27 13 MEAN QFF PRESSURE IN HPA 1013.3 1010.5 1007.9 1005.5 1000.4 993.8 990.3 990.4 998.9 1006.0 1011.3 1014.2 1003.5 MAX. QFF PRESSURE IN HPA 1021.9 1022.4 1015.3 1012.7 1006.8 1001.8 995.4 998.1 1006.7 1012.3 1017.8 1026.4 1026.4 DAY 3 8 25 26 13 11 7 29 18 27 15 30 MIN. QFF PRESSURE IN HPA 1005.1 1000.1 998.0 990.3 994.8 987.4 986.1 986.4 990.0 996.0 1006.6 1006.0 986.1 DAY 27 19 19 19 26 30 1 3 5 8 9 11 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 822.3 822.7 821.5 824.0 822.5 819.4 817.7 817.4 821.2 825.0 826.7 824.0 822.0 MAX. QFE PRESSURE IN HPA 828.8 828.5 825.7 827.9 828.3 822.1 820.1 822.6 826.5 829.6 831.9 831.6 831.9 DAY 3 7 27 13 22 4 8 29 27 31 14 30 MIN. QFE PRESSURE IN HPA 814.4 815.0 815.8 816.5 819.2 815.7 814.9 813.7 816.1 819.4 823.2 816.6 813.7 DAY 22 23 19 19 30 30 1 16 11 8 27 13 MEAN QNH PRESSURE IN HPA 1010.7 1011.2 1009.8 1012.7 1011.0 1007.3 1005.3 1004.9 1009.5 1013.9 1016.0 1012.8 1010.4 MAX. QNH PRESSURE IN HPA 1018.4 1018.1 1014.8 1017.4 1017.8 1010.5 1008.1 1011.1 1015.7 1019.4 1022.1 1021.7 1022.1 DAY 3 7 27 13 22 4 8 29 27 31 14 30 MIN. QNH PRESSURE IN HPA 1001.4 1002.1 1003.0 1003.9 1007.1 1002.9 1002.0 1000.6 1003.4 1007.3 1011.8 1004.0 1000.6 DAY 22 23 19 19 30 30 1 16 11 8 27 13 MEAN QFF PRESSURE IN HPA 1011.5 1009.0 1005.9 1004.5 999.6 992.1 988.7 988.5 996.5 1004.3 1009.6 1012.5 1001.9 MAX. QFF PRESSURE IN HPA 1020.8 1020.0 1012.8 1011.5 1006.0 999.5 992.5 995.7 1005.5 1010.9 1017.8 1023.2 1023.2 DAY 3 7 25 25 22 11 9 29 18 31 14 16 MIN. QFF PRESSURE IN HPA 1002.4 999.6 996.0 993.5 993.6 984.9 984.1 984.8 988.1 995.8 1004.4 1003.1 984.1 DAY 22 23 19 19 30 30 1 6 5 8 9 13 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1970 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 823.0 823.1 821.7 824.3 822.4 819.1 817.3 817.3 821.5 825.2 826.9 824.4 822.2 MAX. QFE PRESSURE IN HPA 829.0 828.5 826.0 827.8 828.0 821.6 819.9 821.8 827.0 829.4 832.5 832.0 832.5 DAY 2 7 25 12 22 4 8 29 27 31 14 30 MIN. QFE PRESSURE IN HPA 815.2 816.3 815.2 815.9 819.1 815.4 815.0 813.4 816.1 819.6 822.5 817.8 813.4 DAY 22 23 19 19 30 30 1 16 11 8 30 13 MEAN QNH PRESSURE IN HPA 1011.6 1011.7 1010.1 1013.1 1010.9 1006.9 1004.9 1004.9 1009.8 1014.2 1016.2 1013.2 1010.6 MAX. QNH PRESSURE IN HPA 1018.7 1018.1 1015.1 1017.2 1017.5 1009.9 1007.9 1010.1 1016.3 1019.1 1022.8 1022.2 1022.8 DAY 2 7 25 12 22 4 8 29 27 31 14 30 MIN. QNH PRESSURE IN HPA 1002.3 1003.6 1002.3 1003.2 1006.9 1002.6 1002.1 1000.2 1003.4 1007.5 1011.0 1005.4 1000.2 DAY 22 23 19 19 30 30 1 16 11 8 30 13 MEAN QFF PRESSURE IN HPA 1013.6 1010.9 1007.2 1005.9 1000.4 992.7 989.3 989.7 998.3 1006.5 1011.8 1014.5 1003.4 MAX. QFF PRESSURE IN HPA 1022.6 1020.2 1014.1 1012.4 1007.7 999.9 993.2 995.9 1007.2 1012.5 1019.9 1025.2 1025.2 DAY 3 7 25 29 2 11 8 29 18 31 14 30 MIN. QFF PRESSURE IN HPA 1004.5 1002.2 996.6 993.9 994.7 985.8 985.1 985.5 989.9 998.5 1007.6 1006.2 985.1 DAY 22 19 19 19 29 30 1 6 1 7 9 10 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 823.6 823.8 822.9 825.3 823.8 820.6 819.0 819.1 823.1 826.5 828.0 825.2 823.4 MAX. QFE PRESSURE IN HPA 829.5 828.6 826.9 829.8 829.1 823.2 821.9 824.2 828.6 831.0 833.7 832.8 833.7 DAY 2 7 25 12 22 4 8 29 27 29 14 30 MIN. QFE PRESSURE IN HPA 815.5 817.3 817.4 814.5 820.2 816.7 816.3 816.2 818.8 821.0 823.6 818.8 814.5 DAY 22 23 19 19 6 30 4 16 8 8 30 13 MEAN QNH PRESSURE IN HPA 1012.2 1012.5 1011.4 1014.3 1012.6 1008.8 1006.8 1007.0 1011.7 1015.7 1017.5 1014.1 1012.1 MAX. QNH PRESSURE IN HPA 1019.2 1018.2 1016.2 1019.6 1018.8 1011.8 1010.3 1013.0 1018.2 1021.0 1024.2 1023.1 1024.2 DAY 2 7 25 12 22 4 8 29 27 29 14 30 MIN. QNH PRESSURE IN HPA 1002.7 1004.8 1004.9 1001.5 1008.2 1004.1 1003.6 1003.5 1006.6 1009.2 1012.3 1006.6 1001.5 DAY 22 23 19 19 6 30 4 16 8 8 30 13 MEAN QFF PRESSURE IN HPA 1014.2 1011.7 1008.5 1006.6 1001.5 994.2 990.8 991.3 1000.1 1007.8 1012.6 1015.7 1004.6 MAX. QFF PRESSURE IN HPA 1021.8 1022.7 1015.8 1013.2 1008.1 1001.5 995.0 998.4 1007.8 1013.9 1019.9 1027.2 1027.2 DAY 3 7 25 25 5 11 8 29 18 31 14 31 MIN. QFF PRESSURE IN HPA 1005.0 1003.1 998.0 992.2 995.1 986.2 987.5 987.4 992.1 999.6 1007.5 1006.9 986.2 DAY 22 18 22 19 20 30 4 7 8 8 27 10 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 823.5 823.9 822.8 825.5 823.9 820.9 819.4 819.6 823.5 826.4 827.9 824.8 823.5 MAX. QFE PRESSURE IN HPA 829.7 828.0 827.2 830.2 828.5 823.9 823.1 824.5 828.7 831.0 832.2 832.1 832.2 DAY 2 7 25 12 22 26 8 29 27 11 14 30 MIN. QFE PRESSURE IN HPA 816.0 817.1 816.7 817.5 820.7 817.2 816.7 816.8 819.4 820.7 824.6 819.2 816.0 DAY 22 22 19 19 30 30 4 6 8 8 27 10 MEAN QNH PRESSURE IN HPA 1012.2 1012.6 1011.3 1014.5 1012.7 1009.1 1007.3 1007.5 1012.1 1015.5 1017.3 1013.7 1012.2 MAX. QNH PRESSURE IN HPA 1019.5 1017.5 1016.5 1020.1 1018.1 1012.6 1011.7 1013.3 1018.3 1021.0 1022.4 1022.3 1022.4 DAY 2 7 25 12 22 26 8 29 27 11 14 30 MIN. QNH PRESSURE IN HPA 1003.3 1004.6 1004.1 1005.1 1008.8 1004.7 1004.1 1004.2 1007.3 1008.8 1013.5 1007.1 1003.3 DAY 22 22 19 19 30 30 4 6 8 8 27 10 MEAN QFF PRESSURE IN HPA 1013.5 1010.4 1007.5 1005.9 1001.0 993.9 990.9 991.1 999.5 1006.0 1011.0 1013.8 1003.7 MAX. QFF PRESSURE IN HPA 1021.6 1021.6 1014.9 1013.2 1007.0 1001.4 996.5 998.0 1007.6 1012.7 1017.6 1026.5 1026.5 DAY 2 7 25 24 12 11 8 29 21 11 14 15 MIN. QFF PRESSURE IN HPA 1005.0 998.9 995.7 992.9 995.1 986.2 987.4 987.2 991.7 997.0 1006.2 1004.3 986.2 DAY 22 18 18 18 26 30 1 6 5 7 27 10 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1971 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) 1.0 2.3 8.6 11.0 18.9 23.9 29.1 27.6 22.8 16.5 9.3 2.8 14.5 MINIMUN AIR TEMPERATURE (C) -3.7 -1.8 4.0 5.9 12.2 15.4 19.6 17.6 11.7 6.4 3.9 -1.7 7.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 11 1 0 0 0 0 12 DAYS WITH MINIMUM TEMP. <=-4 15 10 1 0 0 0 0 0 0 0 0 9 35 DAYS WITH FREEZING MIN.<= 0 28 20 7 0 0 0 0 0 0 0 0 19 74 TEMPERATURE RECORDS LOWEST(C) -10.0 -9.0 -4.0 1.0 7.0 11.0 15.0 14.0 6.0 3.0 1.0 -14.0 -14.0 DAY 20 15 16 2 3 5 25 2 21 11 14 23 MAXIMUM AIR TEMPERATURE (C) 7.9 7.9 15.0 17.4 26.7 32.7 35.5 34.3 29.9 23.4 14.0 7.4 21.0 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 4 26 30 29 17 0 0 0 106 DAYS WITH MAXIMUM TEMP. <= 0 1 1 0 0 0 0 0 0 0 0 0 4 6 TEMPERATURE RECORDS HIGHEST(C) 16.0 15.0 20.0 25.0 31.0 37.0 39.0 37.0 35.0 28.0 22.0 15.0 39.0 DAY 5 22 18 27 27 25 7 17 8 16 3 1 DIF. BETWEEN (MAX.-MIN.) (C) 11.6 9.7 11.0 11.5 14.5 17.3 15.9 16.7 18.2 17.0 10.1 9.1 13.5 MEAN DAILY TEMP. (MDT) (C) 2.1 3.1 9.5 11.7 19.4 24.1 27.6 26.0 20.8 14.9 8.9 2.8 14.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 4.0 98.5 204.0 154.5 40.5 0.0 0.0 0.0 501.5 HEATING DEG. DAYS(BASE 18 0C) 492.5 418.5 262.5 190.0 12.0 0.0 0.0 0.0 10.5 97.0 271.5 470.5 2225.0 DEWPOINT (MEAN C) -4.8 -4.6 -2.1 0.9 4.2 2.4 5.8 5.1 -0.3 -1.6 1.2 -4.6 0.1 MIXING RATIO (G/KG) 3.29 3.40 4.15 5.13 6.43 5.75 7.22 6.90 4.64 4.20 5.17 3.45 4.98 VAPOUR PRESSURE (HPA) 4.35 4.46 5.46 6.72 8.42 7.50 9.40 9.00 6.11 5.55 6.81 4.54 6.53 SATURATION DEF. (HPA) 2.58 3.10 6.26 6.96 14.38 23.92 32.92 29.92 23.67 14.35 5.37 3.50 13.91 RELATIVE HUMIDITY (MEAN %) 68 63 51 53 42 27 25 27 24 32 62 63 45 RELATIVE HUMIDITY (MAX. %) 82 81 71 74 62 42 41 44 40 52 78 78 62 RELATIVE HUMIDITY (MIN. %) 50 44 32 34 23 16 17 17 15 21 50 49 31 RELATIVE HUMIDITY (MEAN% 03UTC) 77 72 64 67 59 40 41 44 40 52 77 76 59 RELATIVE HUMIDITY (MEAN% 09UTC) 60 55 40 44 29 20 19 21 17 23 55 54 36 RELATIVE HUMIDITY (MEAN% 15UTC) 64 56 38 39 30 17 19 20 18 27 58 59 37 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 28.0 46.1 37.9 127.0 62.4 0.0 3.2 11.4 0.0 1.6 88.0 55.2 460.8 DAYS WITH PRECIPITATION >=10 0 2 1 5 3 0 0 0 0 0 3 1 15 DAYS WITH PRECIPITATION >= 5 3 3 3 7 4 0 0 2 0 0 5 6 33 DAYS WITH PRECIPITATION >= 1 7 8 7 10 9 0 2 2 0 1 8 10 64 DAYS WITH PRECIPITATION 7 10 13 14 13 0 2 3 0 2 9 11 84 GREATEST DAILY PRECIPITATION 9.0 16.0 12.0 44.0 20.4 0.0 2.0 6.0 0.0 1.0 25.0 11.0 44.0 DAY 31 13 29 13 7 ** 31 1 ** 27 10 29 DAY WITH THUNDER STORM 0 0 2 2 8 0 0 1 0 0 0 0 13 DAYS WITH SNOW OR SLEET 6 9 3 2 0 0 0 0 0 0 1 4 25 DAYS WITH DUST 0 0 0 0 0 6 1 3 0 1 0 0 11 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 45 45 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 6.5 10.8 10.4 8.8 9.6 9.3 7.3 7.7 7.0 13.1 10.7 12.4 10.3 PREVAILING WIND PERCENT 6.1 29.5 32.7 19.7 22.3 17.6 29.6 21.3 20.0 24.5 22.0 21.3 18.5 CALMS PERCENT OF WIND 91.5 62.1 44.4 59.0 65.2 64.4 44.4 42.6 53.3 54.2 63.3 61.3 60.0 NO. OF WIND OBSERVATION 247 224 248 239 247 239 162 155 150 155 150 155 2371 VECTOR WIND DIRECTION (MEAN) 257 258 251 253 258 276 86 65 60 265 260 250 258 VECTOR WIND MAGNITUDE(KNOTS) 0.6 3.9 5.4 3.0 2.8 1.2 2.5 1.7 1.9 3.4 2.8 4.4 1.8 WIND STEADINESES (MEAN %) 100.0 95.1 91.5 83.3 84.8 42.9 61.0 37.8 52.8 70.8 80.0 91.7 47.4 WIND SPEED (MEAN KNOTS) 0.6 4.1 5.9 3.6 3.3 2.8 4.1 4.5 3.6 4.8 3.5 4.8 3.8 FASTEST WIND DIRECTION 270 270 230 240 270 260 90 270 70 240 260 240 270 FASTEST WIND SPEED (KNOTS) 12 22 30 25 35 18 15 18 15 25 25 26 35 DAY 14 10 14 2 17 1 21 19 5 9 4 8 DAYS WITH SKY CLEAR (0-2)/8 15 11 8 10 11 29 21 27 29 29 10 12 212 DAYS WITH P.CLOUDY (3-6)/8 8 12 13 13 18 1 10 4 1 2 9 13 104 DAYS WITH CLOUDY (7-8)/8 8 5 10 7 2 0 0 0 0 0 11 6 49 DAYS WITH VISIBILITY =< 2 KM 4 4 0 2 0 0 0 0 0 0 1 5 16 DURATION OF SUNSHINE HOURS 166.0 187.7 197.8 237.1 295.9 350.4 296.0 318.3 324.4 299.5 151.2 182.4 3006.7 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1971 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 826.3 820.6 824.1 821.5 823.4 818.7 819.6 819.8 825.5 827.5 826.8 823.1 823.1 MAX. QFE PRESSURE IN HPA 836.5 829.0 829.8 828.4 828.1 823.2 824.3 824.6 832.3 833.8 834.7 833.1 836.5 DAY-HOUR 4- 6 16- 6 3- 6 28- 6 4- 6 1- 6 25- 6 25- 6 23- 6 11- 6 20- 6 11- 6 MIN. QFE PRESSURE IN HPA 817.0 803.6 815.0 812.4 818.6 813.6 815.2 814.8 819.9 821.8 819.2 817.0 803.6 DAY-HOUR 13-21 13-12 15- 0 13- 3 11-15 28-15 21-15 9-12 1-15 2-15 18-12 20- 3 MEAN QNH PRESSURE IN HPA 1015.4 1008.7 1012.9 1009.8 1012.0 1006.5 1007.5 1007.8 1014.6 1016.8 1016.0 1011.7 1011.6 MAX. QNH PRESSURE IN HPA 1027.5 1018.7 1019.6 1017.9 1017.6 1011.8 1013.1 1013.5 1022.5 1024.3 1025.4 1023.5 1027.5 DAY-HOUR 4- 6 16- 6 3- 6 28- 6 4- 6 1- 6 25- 6 25- 6 23- 6 11- 6 20- 6 11- 6 MIN. QNH PRESSURE IN HPA 1004.5 988.6 1002.1 999.0 1006.4 1000.4 1002.3 1001.9 1007.9 1010.1 1007.1 1004.5 988.6 DAY-HOUR 13-21 13-12 15- 0 13- 3 11-15 28-15 21-15 9-12 1-15 2-15 18-12 20- 3 MEAN QFF PRESSURE IN HPA 1017.3 1009.3 1009.0 1004.1 1000.8 992.0 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1028.5 1023.5 1021.9 1013.5 1011.9 1000.3 ****** ****** ****** ****** ****** ****** ****** DAY-HOUR 1- 6 16- 6 16- 6 20- 6 2-15 1- 3 **-** **-** **-** **-** **-** **-** MIN. QFF PRESSURE IN HPA 1005.3 989.3 995.9 990.3 993.0 984.9 ****** ****** ****** ****** ****** ****** ****** DAY-HOUR 13-21 13-12 15- 0 13- 0 29-12 11-12 **-** **-** **-** **-** **-** **-** PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 826.4 820.4 824.0 821.2 823.1 818.9 ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 835.3 827.4 829.1 827.0 826.4 821.7 ****** ****** ****** ****** ****** ****** ****** DAY 4 17 18 28 4 20 ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 817.0 809.7 815.0 813.7 819.0 815.6 ****** ****** ****** ****** ****** ****** ****** DAY 14 14 15 13 11 12 ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1015.6 1008.5 1012.7 1009.5 1011.7 1006.7 ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1026.1 1016.8 1018.8 1016.3 1015.6 1010.0 ****** ****** ****** ****** ****** ****** ****** DAY 4 17 18 28 4 20 ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1004.5 995.8 1002.1 1000.6 1006.8 1002.8 ****** ****** ****** ****** ****** ****** ****** DAY 14 14 15 13 11 12 ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1016.5 1008.8 1008.4 1003.4 1000.4 992.0 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1023.8 1019.0 1017.6 1009.6 1009.2 997.1 ****** ****** ****** ****** ****** ****** ****** DAY 25 17 17 20 3 1 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1005.4 997.8 995.9 990.3 993.9 986.5 ****** ****** ****** ****** ****** ****** ****** DAY 14 23 15 13 11 28 ** ** ** ** ** ** PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 826.4 820.6 824.3 821.8 823.7 819.7 820.6 820.9 826.3 827.9 827.0 823.2 823.5 MAX. QFE PRESSURE IN HPA 835.3 827.4 829.1 827.6 827.0 822.9 823.9 823.7 831.1 832.7 833.3 831.9 835.3 DAY 4 16 18 28 4 1 26 21 23 11 20 11 MIN. QFE PRESSURE IN HPA 817.4 810.0 815.6 812.4 819.5 816.5 817.8 817.1 822.3 823.4 820.1 817.0 810.0 DAY 14 13 15 13 11 29 22 9 2 9 18 20 MEAN QNH PRESSURE IN HPA 1015.6 1008.7 1013.0 1010.1 1012.4 1007.6 1008.7 1009.0 1015.4 1017.4 1016.3 1011.7 1012.2 MAX. QNH PRESSURE IN HPA 1026.1 1016.8 1018.8 1017.0 1016.3 1011.4 1012.6 1012.4 1021.1 1023.0 1023.7 1022.1 1026.1 DAY 4 16 18 28 4 1 26 21 23 11 20 11 MIN. QNH PRESSURE IN HPA 1004.9 996.2 1002.8 999.0 1007.4 1003.9 1005.4 1004.6 1010.7 1012.0 1008.1 1004.5 996.2 DAY 14 13 15 13 11 29 22 9 2 9 18 20 MEAN QFF PRESSURE IN HPA 1017.9 1010.1 1009.5 1005.0 1002.2 994.1 992.7 994.2 1004.6 1010.7 1013.2 1013.2 1005.6 MAX. QFF PRESSURE IN HPA 1026.0 1021.0 1019.9 1012.8 1011.3 1000.3 999.4 1000.1 1013.7 1018.0 1023.3 1023.1 1026.0 DAY 4 16 16 20 3 1 26 2 23 11 20 22 MIN. QFF PRESSURE IN HPA 1006.7 996.9 997.3 990.5 995.5 989.0 988.0 989.7 996.8 1001.4 1003.5 1004.8 988.0 DAY 14 13 15 13 11 28 9 9 2 9 18 13 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1971 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 827.5 821.6 825.2 822.5 824.5 820.1 820.9 821.4 827.1 828.9 828.1 824.2 824.3 MAX. QFE PRESSURE IN HPA 836.5 829.0 829.8 828.4 828.1 823.2 824.3 824.6 832.3 833.8 834.7 833.1 836.5 DAY 4 16 3 28 4 1 25 25 23 11 20 11 MIN. QFE PRESSURE IN HPA 818.1 808.8 817.7 813.2 820.2 817.0 818.4 817.5 823.0 824.6 821.0 818.1 808.8 DAY 14 13 20 13 29 29 23 9 1 9 18 20 MEAN QNH PRESSURE IN HPA 1016.9 1009.9 1014.1 1011.0 1013.3 1008.1 1009.1 1009.7 1016.4 1018.5 1017.6 1013.0 1013.1 MAX. QNH PRESSURE IN HPA 1027.5 1018.7 1019.6 1017.9 1017.6 1011.8 1013.1 1013.5 1022.5 1024.3 1025.4 1023.5 1027.5 DAY 4 16 3 28 4 1 25 25 23 11 20 11 MIN. QNH PRESSURE IN HPA 1005.8 994.8 1005.3 1000.0 1008.2 1004.5 1006.1 1005.1 1011.6 1013.5 1009.2 1005.8 994.8 DAY 14 13 20 13 29 29 23 9 1 9 18 20 MEAN QFF PRESSURE IN HPA 1019.9 1011.2 1010.9 1005.5 1002.1 993.7 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1028.5 1023.5 1021.9 1013.5 1010.1 998.9 ****** ****** ****** ****** ****** ****** ****** DAY 1 16 16 20 3 1 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1007.3 994.9 998.9 992.7 995.5 989.0 ****** ****** ****** ****** ****** ****** ****** DAY 14 13 20 13 29 29 ** ** ** ** ** ** PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 826.6 821.0 824.5 821.9 823.5 818.9 819.8 820.1 825.9 827.7 827.0 823.3 823.3 MAX. QFE PRESSURE IN HPA 835.7 828.1 829.5 827.4 827.0 822.2 823.4 822.8 831.5 832.3 834.2 832.2 835.7 DAY 3 16 3 28 4 1 25 21 23 11 20 11 MIN. QFE PRESSURE IN HPA 818.1 806.8 817.1 815.4 819.6 815.5 817.5 815.3 821.8 823.7 820.6 818.6 806.8 DAY 14 13 20 13 28 28 8 9 30 2 18 15 MEAN QNH PRESSURE IN HPA 1015.8 1009.2 1013.3 1010.3 1012.1 1006.7 1007.8 1008.1 1015.0 1017.2 1016.3 1011.9 1012.0 MAX. QNH PRESSURE IN HPA 1026.6 1017.6 1019.2 1016.8 1016.3 1010.6 1012.0 1011.3 1021.6 1022.5 1024.8 1022.4 1026.6 DAY 3 16 3 28 4 1 25 21 23 11 20 11 MIN. QNH PRESSURE IN HPA 1005.8 992.4 1004.6 1002.6 1007.5 1002.7 1005.1 1002.5 1010.1 1012.4 1008.7 1006.4 992.4 DAY 14 13 20 13 28 28 8 9 30 2 18 15 MEAN QFF PRESSURE IN HPA 1017.0 1008.9 1009.0 1004.2 1000.1 991.4 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1024.7 1019.4 1020.8 1010.8 1007.6 995.7 ****** ****** ****** ****** ****** ****** ****** DAY 3 16 16 20 3 20 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1006.1 992.2 998.0 997.6 993.3 985.9 ****** ****** ****** ****** ****** ****** ****** DAY 13 13 20 13 28 28 ** ** ** ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 825.2 819.7 823.1 820.7 822.4 817.3 818.4 818.5 824.3 826.3 825.8 822.4 822.0 MAX. QFE PRESSURE IN HPA 834.0 826.2 828.0 826.0 826.1 820.8 822.5 821.8 830.0 830.3 833.0 830.7 834.0 DAY 4 16 16 27 4 1 25 21 23 11 20 11 MIN. QFE PRESSURE IN HPA 817.4 803.6 816.3 814.6 818.9 814.1 815.5 814.8 820.1 822.0 819.2 818.3 803.6 DAY 13 13 20 13 29 28 21 9 1 2 18 15 MEAN QNH PRESSURE IN HPA 1014.2 1007.6 1011.6 1008.8 1010.9 1004.8 1006.1 1006.2 1013.1 1015.5 1014.9 1010.8 1010.4 MAX. QNH PRESSURE IN HPA 1024.6 1015.3 1017.5 1015.1 1015.2 1009.0 1011.0 1010.1 1019.8 1020.2 1023.4 1020.7 1024.6 DAY 4 16 16 27 4 1 25 21 23 11 20 11 MIN. QNH PRESSURE IN HPA 1004.9 988.6 1003.6 1001.6 1006.7 1001.0 1002.7 1001.9 1008.1 1010.4 1007.1 1006.0 988.6 DAY 13 13 20 13 29 28 21 9 1 2 18 15 MEAN QFF PRESSURE IN HPA 1015.0 1007.7 1007.2 1002.7 999.6 989.9 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1021.4 1017.6 1018.3 1008.4 1006.9 995.7 ****** ****** ****** ****** ****** ****** ****** DAY 1 16 16 20 2 1 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1005.6 989.3 998.1 995.9 993.0 984.9 ****** ****** ****** ****** ****** ****** ****** DAY 13 13 14 12 29 11 ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1971 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 825.4 819.8 823.2 820.5 822.5 817.1 818.1 818.4 824.2 826.5 826.1 822.6 822.0 MAX. QFE PRESSURE IN HPA 834.3 826.0 828.3 825.6 827.7 820.1 822.0 821.6 829.8 830.6 832.6 830.3 834.3 DAY 3 16 17 27 2 1 25 1 23 11 20 11 MIN. QFE PRESSURE IN HPA 817.8 804.7 816.9 813.2 818.6 813.6 815.2 814.8 819.9 821.8 820.0 818.7 804.7 DAY 13 13 20 13 11 28 21 9 1 2 18 15 MEAN QNH PRESSURE IN HPA 1014.4 1007.8 1011.8 1008.6 1011.0 1004.5 1005.7 1006.1 1013.0 1015.7 1015.2 1011.1 1010.4 MAX. QNH PRESSURE IN HPA 1024.9 1015.1 1017.8 1014.6 1017.1 1008.1 1010.4 1009.9 1019.6 1020.5 1022.9 1020.2 1024.9 DAY 3 16 17 27 2 1 25 1 23 11 20 11 MIN. QNH PRESSURE IN HPA 1005.4 989.9 1004.3 1000.0 1006.4 1000.4 1002.3 1001.9 1007.9 1010.1 1008.0 1006.5 989.9 DAY 13 13 20 13 11 28 21 9 1 2 18 15 MEAN QFF PRESSURE IN HPA 1016.7 1008.9 1008.2 1003.4 1000.8 990.9 989.7 991.2 1002.1 1009.0 1012.0 1012.6 1003.8 MAX. QFF PRESSURE IN HPA 1024.1 1018.9 1018.4 1009.7 1011.9 996.2 997.2 998.6 1011.9 1015.4 1022.2 1023.4 1024.1 DAY 4 16 16 20 2 1 25 1 23 11 20 22 MIN. QFF PRESSURE IN HPA 1006.8 991.2 999.7 994.9 994.1 985.8 985.4 987.1 993.8 1001.3 1004.0 1005.2 985.4 DAY 14 13 14 13 29 27 21 9 1 2 18 13 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 826.3 820.7 824.4 821.8 823.6 818.8 ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 834.9 827.0 829.3 827.2 827.5 821.9 ****** ****** ****** ****** ****** ****** ****** DAY 3 16 17 21 19 17 ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 817.4 806.7 818.7 815.2 820.3 815.3 ****** ****** ****** ****** ****** ****** ****** DAY 13 13 20 13 10 28 ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1015.5 1008.9 1013.2 1010.2 1012.3 1006.5 ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1025.6 1016.3 1019.0 1016.5 1016.9 1010.3 ****** ****** ****** ****** ****** ****** ****** DAY 3 16 17 21 19 17 ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1004.9 992.3 1006.5 1002.3 1008.4 1002.5 ****** ****** ****** ****** ****** ****** ****** DAY 13 13 20 13 10 28 ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1018.5 1010.0 1009.9 1004.6 1001.2 992.1 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1025.6 1020.4 1019.9 1010.2 1008.8 996.2 ****** ****** ****** ****** ****** ****** ****** DAY 3 16 16 3 2 17 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1007.0 992.1 1000.8 995.3 995.0 987.4 ****** ****** ****** ****** ****** ****** ****** DAY 13 13 14 12 28 27 ** ** ** ** ** ** PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA 826.4 820.8 824.4 821.8 823.7 819.1 ****** ****** ****** ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA 834.7 827.4 829.7 827.5 827.2 822.0 ****** ****** ****** ****** ****** ****** ****** DAY 3 16 17 28 2 19 ** ** ** ** ** ** MIN. QFE PRESSURE IN HPA 817.0 808.2 816.6 815.7 819.3 816.0 ****** ****** ****** ****** ****** ****** ****** DAY 13 13 14 13 10 11 ** ** ** ** ** ** MEAN QNH PRESSURE IN HPA 1015.6 1009.0 1013.2 1010.1 1012.4 1007.0 ****** ****** ****** ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA 1025.4 1016.8 1019.5 1016.9 1016.5 1010.4 ****** ****** ****** ****** ****** ****** ****** DAY 3 16 17 28 2 19 ** ** ** ** ** ** MIN. QNH PRESSURE IN HPA 1004.5 994.1 1004.0 1002.9 1007.2 1003.3 ****** ****** ****** ****** ****** ****** ****** DAY 13 13 14 13 10 11 ** ** ** ** ** ** MEAN QFF PRESSURE IN HPA 1016.9 1009.1 1008.8 1004.1 1000.4 991.9 ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA 1023.9 1019.1 1019.4 1010.1 1007.9 996.0 ****** ****** ****** ****** ****** ****** ****** DAY 24 15 16 19 2 6 ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA 1005.3 995.1 998.4 992.8 993.3 986.4 ****** ****** ****** ****** ****** ****** ****** DAY 13 13 14 12 28 27 ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1972 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -5.2 -4.5 4.9 12.7 14.3 22.7 26.6 23.1 21.9 17.5 8.2 -1.5 11.7 MINIMUN AIR TEMPERATURE (C) -8.6 -9.4 0.7 7.3 9.0 14.7 17.6 15.1 13.2 10.1 2.9 -4.5 5.7 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 0 1 0 0 0 0 0 1 DAYS WITH MINIMUM TEMP. <=-4 25 24 2 0 0 0 0 0 0 0 0 15 66 DAYS WITH FREEZING MIN.<= 0 29 28 14 0 0 0 0 0 0 0 4 30 105 TEMPERATURE RECORDS LOWEST(C) -18.0 -22.0 -4.0 4.0 4.0 11.0 15.0 11.0 10.0 4.0 0.0 -13.0 -22.0 DAY 5 4 11 1 8 10 1 27 19 31 10 27 MAXIMUM AIR TEMPERATURE (C) -0.5 1.6 10.5 20.0 21.3 30.7 35.5 31.8 31.0 26.2 15.0 2.7 18.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 0 23 31 26 23 5 0 0 108 DAYS WITH MAXIMUM TEMP. <= 0 19 14 1 0 0 0 0 0 0 0 0 8 42 TEMPERATURE RECORDS HIGHEST(C) 7.0 10.0 18.0 26.0 28.0 35.0 38.0 36.0 34.0 30.0 22.0 8.0 38.0 DAY 16 18 29 10 26 29 10 13 3 1 2 16 DIF. BETWEEN (MAX.-MIN.) (C) 8.1 11.0 9.8 12.7 12.3 16.0 17.9 16.7 17.8 16.1 12.1 7.2 13.1 MEAN DAILY TEMP. (MDT) (C) -4.5 -3.9 5.6 13.6 15.1 22.7 26.5 23.5 22.1 18.2 9.0 -0.9 12.2 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 0.0 56.5 171.0 80.5 41.0 0.5 0.0 0.0 349.5 HEATING DEG. DAYS(BASE 18 0C) 699.0 636.0 385.0 131.0 95.0 0.0 0.0 0.0 0.0 24.0 271.0 585.5 2826.5 DEWPOINT (MEAN C) -8.1 -8.7 -1.7 2.6 4.2 3.3 3.0 4.3 0.6 -0.9 -1.0 -5.3 -0.6 MIXING RATIO (G/KG) 2.67 2.59 4.17 5.71 6.39 6.19 5.97 6.56 4.99 4.40 4.43 3.26 4.78 VAPOUR PRESSURE (HPA) 3.51 3.42 5.48 7.49 8.37 8.10 7.79 8.59 6.56 5.82 5.84 4.31 6.27 SATURATION DEF. (HPA) 0.94 1.41 3.57 7.84 8.70 20.86 28.84 21.25 21.29 15.31 5.49 1.37 11.40 RELATIVE HUMIDITY (MEAN %) 81 74 66 53 54 33 24 32 27 31 56 77 51 RELATIVE HUMIDITY (MAX. %) 90 86 83 75 76 53 40 51 44 45 75 88 67 RELATIVE HUMIDITY (MIN. %) 68 59 48 34 34 17 12 19 15 18 39 64 36 RELATIVE HUMIDITY (MEAN% 03UTC) 87 85 77 68 70 51 38 48 41 43 70 84 64 RELATIVE HUMIDITY (MEAN% 09UTC) 76 65 55 38 39 22 16 22 18 21 44 67 40 RELATIVE HUMIDITY (MEAN% 15UTC) 79 71 58 46 43 21 14 23 18 27 56 77 44 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 56.4 46.7 106.7 25.8 38.0 7.3 0.0 5.0 0.0 0.2 110.0 68.8 464.9 DAYS WITH PRECIPITATION >=10 2 1 4 0 1 0 0 0 0 0 2 2 12 DAYS WITH PRECIPITATION >= 5 4 2 6 2 3 0 0 0 0 0 2 4 23 DAYS WITH PRECIPITATION >= 1 10 6 13 8 11 2 0 3 0 0 4 8 65 DAYS WITH PRECIPITATION 11 9 17 12 15 4 0 3 0 1 4 10 86 GREATEST DAILY PRECIPITATION 15.0 32.0 26.0 8.0 17.0 4.0 0.0 3.0 0.0 0.2 80.0 23.0 80.0 DAY 29 8 22 12 7 11 ** 5 ** 30 4 6 DAY WITH THUNDER STORM 0 0 0 1 2 2 0 1 1 1 1 0 9 DAYS WITH SNOW OR SLEET 11 7 8 0 0 0 0 0 0 0 1 9 36 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 270 225 270 270 270 270 90 90 270 270 270 270 270 PREVAILING WIND SPEED(KNOTS) 10.0 6.0 10.6 9.2 11.1 9.5 8.7 7.1 9.8 9.0 8.2 7.4 9.3 PREVAILING WIND PERCENT 11.1 8.9 22.1 32.6 32.4 22.9 17.8 14.2 21.7 23.0 18.1 20.7 19.6 CALMS PERCENT OF WIND 77.9 69.0 51.7 43.5 44.9 51.7 57.5 55.9 50.9 51.2 70.0 66.4 57.1 NO. OF WIND OBSERVATION 217 203 240 239 247 240 247 247 226 217 210 217 2750 VECTOR WIND DIRECTION (MEAN) 272 349 257 256 260 266 70 58 274 266 262 271 266 VECTOR WIND MAGNITUDE(KNOTS) 0.9 0.4 3.1 3.7 4.1 2.5 1.3 0.7 1.6 2.6 1.7 1.5 1.7 WIND STEADINESES (MEAN %) 47.4 18.2 70.5 75.5 75.9 64.1 36.1 21.9 37.2 66.7 70.8 57.7 47.2 WIND SPEED (MEAN KNOTS) 1.9 2.2 4.4 4.9 5.4 3.9 3.6 3.2 4.3 3.9 2.4 2.6 3.6 FASTEST WIND DIRECTION 240 250 240 270 280 260 240 260 270 280 210 240 280 FASTEST WIND SPEED (KNOTS) 18 17 20 20 25 18 18 15 20 18 18 18 25 DAY 22 6 26 22 29 11 31 14 21 30 3 16 DAYS WITH SKY CLEAR (0-2)/8 8 14 11 9 6 25 30 28 27 21 18 11 208 DAYS WITH P.CLOUDY (3-6)/8 9 9 5 14 19 3 1 3 3 9 8 10 93 DAYS WITH CLOUDY (7-8)/8 14 6 15 7 6 2 0 0 0 1 4 10 65 DAYS WITH VISIBILITY =< 2 KM 13 2 5 0 0 0 1 0 0 0 1 1 23 DURATION OF SUNSHINE HOURS 106.7 192.6 171.8 231.9 236.5 351.6 372.8 329.2 316.3 264.8 211.8 143.7 2929.7 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1972 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 823.6 824.4 821.9 823.6 822.5 822.1 820.1 823.4 825.4 828.8 826.5 825.8 824.0 MAX. QFE PRESSURE IN HPA 833.5 830.8 829.7 827.5 829.4 828.4 824.9 828.3 831.3 835.5 833.3 831.0 835.5 DAY-HOUR 5- 6 12- 6 29- 6 7- 6 25- 6 1- 6 24- 6 24-21 17- 6 26- 6 24- 6 25- 9 MIN. QFE PRESSURE IN HPA 814.7 818.2 812.7 818.1 812.4 815.7 812.3 815.1 820.6 823.9 821.3 819.0 812.3 DAY-HOUR 22-12 20- 0 18- 0 4-12 6- 6 29-12 31-12 1-12 12-15 30-12 29-12 22-12 MEAN QNH PRESSURE IN HPA 1012.3 1013.2 1010.3 1012.3 1011.0 1010.5 1008.1 1012.1 1014.4 1018.4 1015.7 1014.8 1012.8 MAX. QNH PRESSURE IN HPA 1024.0 1020.8 1019.5 1016.9 1019.1 1017.9 1013.8 1017.8 1021.4 1026.3 1023.7 1021.0 1026.3 DAY-HOUR 5- 6 12- 6 29- 6 7- 6 25- 6 1- 6 24- 6 24-21 17- 6 26- 6 24- 6 25- 9 MIN. QNH PRESSURE IN HPA 1001.7 1005.9 999.4 1005.8 999.0 1002.9 998.9 1002.2 1008.7 1012.6 1009.6 1006.8 998.9 DAY-HOUR 22-12 20- 0 18- 0 4-12 6- 6 29-12 31-12 1-12 12-15 30-12 29-12 22-12 MEAN QFF PRESSURE IN HPA 1019.2 1019.9 1009.0 1005.3 1002.8 996.9 991.9 998.1 1001.5 1009.2 1012.6 1018.9 1007.1 MAX. QFF PRESSURE IN HPA 1039.3 1033.6 1017.9 1012.4 1010.3 1007.2 997.5 1005.0 1010.2 1019.8 1022.8 1031.8 1039.3 DAY-HOUR 5- 6 12- 3 28- 6 1- 6 24- 3 10-18 14- 6 9- 3 18- 3 26- 6 24- 6 25-18 MIN. QFF PRESSURE IN HPA 1003.5 1005.8 999.0 999.5 989.8 985.5 983.2 986.7 994.6 1002.8 1004.6 1006.9 983.2 DAY-HOUR 22-12 20- 0 18- 0 23-12 6- 6 29-12 31-12 1- 0 10-12 17-12 8- 0 16-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA 823.4 824.1 821.6 823.5 822.3 822.3 820.1 823.5 825.5 828.9 826.5 825.6 824.0 MAX. QFE PRESSURE IN HPA 832.9 829.7 828.8 826.9 828.0 827.2 823.4 827.2 829.9 834.0 831.2 830.4 834.0 DAY 5 12 29 8 24 1 25 9 17 26 24 28 MIN. QFE PRESSURE IN HPA 816.3 818.2 812.7 818.8 813.4 817.4 815.7 815.4 821.5 824.7 822.1 820.0 812.7 DAY 14 20 18 25 6 30 4 1 10 30 30 17 MEAN QNH PRESSURE IN HPA 1012.1 1012.8 1009.9 1012.2 1010.8 1010.7 1008.2 1012.1 1014.5 1018.5 1015.7 1014.7 1012.7 MAX. QNH PRESSURE IN HPA 1023.3 1019.5 1018.4 1016.2 1017.5 1016.5 1012.0 1016.5 1019.7 1024.6 1021.3 1020.3 1024.6 DAY 5 12 29 8 24 1 25 9 17 26 24 28 MIN. QNH PRESSURE IN HPA 1003.6 1005.9 999.4 1006.6 1000.2 1004.9 1002.9 1002.6 1009.8 1013.6 1010.5 1008.0 999.4 DAY 14 20 18 25 6 30 4 1 10 30 30 17 MEAN QFF PRESSURE IN HPA 1018.3 1018.6 1008.2 1005.0 1002.4 996.9 991.6 997.6 1001.1 1008.2 1011.6 1018.2 1006.5 MAX. QFF PRESSURE IN HPA 1035.9 1029.2 1015.8 1009.9 1009.6 1005.4 995.1 1003.5 1007.7 1014.9 1018.0 1029.1 1035.9 DAY 5 12 29 1 24 10 14 25 18 26 24 26 MIN. QFF PRESSURE IN HPA 1004.3 1005.8 999.0 999.6 991.1 987.7 986.0 986.7 994.9 1003.5 1004.6 1007.4 986.0 DAY 23 20 18 24 6 29 4 1 10 30 8 17 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 823.7 824.3 822.1 823.9 822.7 823.0 821.0 824.2 826.2 829.3 826.9 825.8 824.4 MAX. QFE PRESSURE IN HPA 832.9 830.0 829.4 827.2 828.8 828.0 823.8 827.7 830.9 834.5 831.6 830.4 834.5 DAY 5 12 29 8 25 1 11 8 17 26 24 28 MIN. QFE PRESSURE IN HPA 816.5 819.2 813.4 819.8 813.0 818.3 816.5 815.8 822.0 824.7 821.8 820.2 813.0 DAY 14 20 18 24 6 30 4 1 10 30 29 22 MEAN QNH PRESSURE IN HPA 1012.4 1013.1 1010.5 1012.7 1011.2 1011.6 1009.1 1012.9 1015.3 1019.1 1016.1 1014.9 1013.2 MAX. QNH PRESSURE IN HPA 1023.3 1019.8 1019.1 1016.5 1018.4 1017.5 1012.5 1017.1 1020.9 1025.1 1021.7 1020.3 1025.1 DAY 5 12 29 8 25 1 11 8 17 26 24 28 MIN. QNH PRESSURE IN HPA 1003.9 1007.1 1000.2 1007.8 999.7 1006.0 1003.9 1003.0 1010.4 1013.6 1010.1 1008.2 999.7 DAY 14 20 18 24 6 30 4 1 10 30 29 22 MEAN QFF PRESSURE IN HPA 1019.5 1020.6 1010.0 1006.8 1003.7 998.9 994.0 1000.1 1003.8 1010.7 1013.8 1019.4 1008.4 MAX. QFF PRESSURE IN HPA 1038.4 1033.6 1017.5 1012.4 1010.3 1006.3 997.1 1005.0 1010.2 1018.8 1020.6 1030.3 1038.4 DAY 5 12 29 16 24 1 14 9 18 26 24 26 MIN. QFF PRESSURE IN HPA 1005.5 1008.3 1000.1 1001.4 991.7 991.4 988.3 988.4 997.7 1005.0 1005.9 1009.5 988.3 DAY 23 18 18 11 6 30 4 1 4 30 29 22 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1972 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 824.7 825.4 822.9 824.5 823.2 823.2 821.3 824.5 826.9 830.1 827.8 826.8 825.1 MAX. QFE PRESSURE IN HPA 833.5 830.8 829.7 827.5 829.4 828.4 824.9 828.2 831.3 835.5 833.3 830.8 835.5 DAY 5 12 29 7 25 1 24 8 17 26 24 28 MIN. QFE PRESSURE IN HPA 816.6 818.6 814.8 819.8 812.4 818.3 816.7 816.3 823.2 824.9 822.6 820.8 812.4 DAY 22 8 18 24 6 30 31 1 12 30 29 22 MEAN QNH PRESSURE IN HPA 1013.5 1014.4 1011.5 1013.4 1011.7 1011.8 1009.6 1013.3 1016.1 1020.0 1017.3 1016.1 1014.1 MAX. QNH PRESSURE IN HPA 1024.0 1020.8 1019.5 1016.9 1019.1 1017.9 1013.8 1017.7 1021.4 1026.3 1023.7 1020.8 1026.3 DAY 5 12 29 7 25 1 24 8 17 26 24 28 MIN. QNH PRESSURE IN HPA 1004.0 1006.4 1001.9 1007.8 999.0 1006.0 1004.1 1003.6 1011.8 1013.8 1011.1 1009.0 999.0 DAY 22 8 18 24 6 30 31 1 12 30 29 22 MEAN QFF PRESSURE IN HPA 1020.8 1021.6 1010.8 1006.6 1003.6 998.1 993.4 999.5 1003.8 1011.1 1014.4 1020.4 1008.7 MAX. QFF PRESSURE IN HPA 1039.3 1032.8 1017.9 1012.4 1009.9 1006.5 997.5 1004.7 1009.5 1019.8 1022.8 1031.1 1039.3 DAY 5 12 28 1 24 1 14 25 18 26 24 26 MIN. QFF PRESSURE IN HPA 1007.7 1009.6 1001.6 1001.4 989.8 989.4 987.4 988.5 997.8 1004.5 1007.3 1010.7 987.4 DAY 23 18 18 24 6 29 4 1 10 30 29 22 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 824.1 824.9 822.4 823.8 822.6 822.2 820.2 823.4 825.6 829.0 826.5 826.0 824.2 MAX. QFE PRESSURE IN HPA 831.8 830.8 829.3 827.0 828.5 827.4 824.0 827.6 830.5 833.8 830.8 831.0 833.8 DAY 5 23 28 7 23 1 24 8 17 25 23 25 MIN. QFE PRESSURE IN HPA 815.6 819.2 815.0 819.4 812.6 817.3 814.6 815.7 821.7 824.3 821.5 820.0 812.6 DAY 22 8 18 24 6 30 31 1 11 30 3 22 MEAN QNH PRESSURE IN HPA 1012.8 1013.8 1010.9 1012.5 1011.1 1010.6 1008.3 1012.0 1014.7 1018.6 1015.7 1015.1 1013.0 MAX. QNH PRESSURE IN HPA 1022.0 1020.8 1019.0 1016.3 1018.1 1016.8 1012.7 1017.0 1020.4 1024.3 1020.8 1021.0 1024.3 DAY 5 23 28 7 23 1 24 8 17 25 23 25 MIN. QNH PRESSURE IN HPA 1002.8 1007.1 1002.1 1007.3 999.3 1004.8 1001.6 1002.9 1010.0 1013.1 1009.8 1008.0 999.3 DAY 22 8 18 24 6 30 31 1 11 30 3 22 MEAN QFF PRESSURE IN HPA ****** ****** 1009.1 1004.7 1002.4 995.9 991.5 997.5 999.1 ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** 1016.6 1009.7 1010.0 1004.0 994.9 1002.7 1007.7 ****** ****** ****** ****** DAY ** ** 28 7 19 10 13 28 17 ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** 1000.8 1000.4 990.2 987.6 984.0 992.6 996.0 ****** ****** ****** ****** DAY ** ** 17 23 6 29 31 2 11 ** ** ** PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 822.9 823.7 820.9 822.6 821.8 821.1 818.8 822.0 824.2 827.6 825.5 825.0 823.0 MAX. QFE PRESSURE IN HPA 830.3 829.4 827.8 825.7 827.8 826.1 823.1 826.2 829.0 833.1 829.7 829.8 833.1 DAY 5 12 28 7 23 4 24 8 17 25 23 25 MIN. QFE PRESSURE IN HPA 814.7 819.4 813.6 818.1 812.6 815.7 812.3 815.1 820.7 823.9 821.3 819.0 812.3 DAY 22 9 18 4 6 29 31 1 12 30 29 22 MEAN QNH PRESSURE IN HPA 1011.4 1012.4 1009.1 1011.0 1010.1 1009.3 1006.6 1010.4 1013.0 1017.0 1014.5 1013.9 1011.6 MAX. QNH PRESSURE IN HPA 1020.2 1019.1 1017.2 1014.8 1017.2 1015.2 1011.7 1015.3 1018.7 1023.5 1019.5 1019.6 1023.5 DAY 5 12 28 7 23 4 24 8 17 25 23 25 MIN. QNH PRESSURE IN HPA 1001.7 1007.3 1000.4 1005.8 999.3 1002.9 998.9 1002.2 1008.8 1012.6 1009.6 1006.8 998.9 DAY 22 9 18 4 6 29 31 1 12 30 29 22 MEAN QFF PRESSURE IN HPA 1017.6 1017.9 1007.2 1003.7 1001.8 995.5 990.0 995.9 999.5 1006.7 1010.5 1017.4 1005.3 MAX. QFF PRESSURE IN HPA 1033.3 1027.9 1014.5 1008.3 1009.5 1003.5 994.5 1001.5 1006.2 1012.5 1016.1 1028.5 1033.3 DAY 5 12 28 7 19 10 24 8 17 25 23 25 MIN. QFF PRESSURE IN HPA 1003.5 1006.7 999.5 999.5 991.3 985.5 983.2 987.5 994.6 1002.8 1004.9 1006.9 983.2 DAY 22 19 18 23 6 29 31 1 10 17 28 16 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1972 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 823.2 824.0 821.1 822.7 821.8 821.0 818.5 822.0 824.1 827.7 825.7 825.3 823.1 MAX. QFE PRESSURE IN HPA 830.7 829.6 827.5 825.4 827.8 826.5 822.0 826.2 828.8 832.9 830.3 830.2 832.9 DAY 5 12 28 7 23 10 24 8 17 25 23 25 MIN. QFE PRESSURE IN HPA 815.4 819.7 813.6 819.3 813.4 815.7 813.4 816.4 820.6 824.8 821.3 819.2 813.4 DAY 22 8 17 3 6 29 31 1 12 29 29 22 MEAN QNH PRESSURE IN HPA 1011.8 1012.7 1009.3 1011.2 1010.1 1009.2 1006.3 1010.4 1012.9 1017.1 1014.7 1014.2 1011.7 MAX. QNH PRESSURE IN HPA 1020.7 1019.4 1016.9 1014.4 1017.2 1015.7 1010.4 1015.3 1018.4 1023.3 1020.2 1020.1 1023.3 DAY 5 12 28 7 23 10 24 8 17 25 23 25 MIN. QNH PRESSURE IN HPA 1002.6 1007.7 1000.4 1007.2 1000.2 1002.9 1000.2 1003.8 1008.7 1013.7 1009.6 1007.1 1000.2 DAY 22 8 17 3 6 29 31 1 12 29 29 22 MEAN QFF PRESSURE IN HPA 1018.9 1020.0 1008.4 1005.1 1002.6 996.6 991.1 997.5 1001.4 1008.7 1012.4 1018.8 1006.8 MAX. QFF PRESSURE IN HPA 1035.7 1031.6 1016.2 1009.8 1008.9 1006.9 995.3 1002.9 1007.9 1015.2 1018.8 1030.9 1035.7 DAY 5 12 28 1 23 10 13 8 21 25 23 25 MIN. QFF PRESSURE IN HPA 1005.4 1008.0 999.4 1001.7 993.7 988.2 985.6 990.0 995.5 1005.5 1005.8 1009.3 985.6 DAY 22 18 17 26 6 29 31 1 4 16 29 22 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 823.7 824.6 822.2 824.0 823.0 822.1 820.1 823.9 825.7 829.2 826.7 826.0 824.3 MAX. QFE PRESSURE IN HPA 831.5 830.0 828.9 826.8 828.8 827.8 823.7 827.8 830.3 834.2 831.2 830.5 834.2 DAY 4 12 15 15 23 10 24 24 17 25 23 25 MIN. QFE PRESSURE IN HPA 815.8 819.8 813.4 820.3 816.8 816.6 815.0 818.9 821.8 826.4 821.6 820.0 813.4 DAY 22 19 17 3 5 29 31 1 9 16 30 30 MEAN QNH PRESSURE IN HPA 1012.4 1013.4 1010.6 1012.7 1011.6 1010.5 1008.1 1012.6 1014.8 1018.8 1015.9 1015.1 1013.1 MAX. QNH PRESSURE IN HPA 1021.6 1019.8 1018.5 1016.0 1018.4 1017.2 1012.4 1017.2 1020.2 1024.8 1021.3 1020.4 1024.8 DAY 4 12 15 15 23 10 24 24 17 25 23 25 MIN. QNH PRESSURE IN HPA 1003.0 1007.8 1000.2 1008.4 1004.2 1004.0 1002.1 1006.7 1010.1 1015.6 1009.9 1008.0 1000.2 DAY 22 19 17 3 5 29 31 1 9 16 30 30 MEAN QFF PRESSURE IN HPA 1020.0 1020.4 1009.7 1005.8 1003.4 996.9 992.1 998.8 1002.5 1009.9 1013.1 1019.6 1007.7 MAX. QFF PRESSURE IN HPA 1035.4 1032.0 1017.1 1010.1 1009.8 1007.2 995.9 1004.6 1009.1 1016.8 1020.4 1031.8 1035.4 DAY 4 12 20 15 23 10 13 24 30 25 23 25 MIN. QFF PRESSURE IN HPA 1006.0 1008.4 999.8 1001.9 996.0 987.6 986.9 992.8 995.9 1005.9 1006.1 1008.9 986.9 DAY 22 18 17 22 5 29 31 1 9 17 7 16 PRESSURE AT HOUR 2100 UTC. MEAN QFE PRESSURE IN HPA ****** ****** 822.1 824.0 822.9 822.3 820.6 824.1 824.7 ****** ****** ****** ****** MAX. QFE PRESSURE IN HPA ****** ****** 829.0 827.3 828.8 827.4 824.1 828.3 830.0 ****** ****** ****** ****** DAY ** ** 28 7 23 3 24 24 16 ** ** ** MIN. QFE PRESSURE IN HPA ****** ****** 813.4 819.6 816.5 817.3 816.3 819.2 822.0 ****** ****** ****** ****** DAY ** ** 17 24 5 29 3 1 11 ** ** ** MEAN QNH PRESSURE IN HPA ****** ****** 1010.5 1012.7 1011.4 1010.8 1008.7 1012.9 1013.5 ****** ****** ****** ****** MAX. QNH PRESSURE IN HPA ****** ****** 1018.7 1016.6 1018.4 1016.8 1012.9 1017.8 1019.8 ****** ****** ****** ****** DAY ** ** 28 7 23 3 24 24 16 ** ** ** MIN. QNH PRESSURE IN HPA ****** ****** 1000.2 1007.5 1003.9 1004.8 1003.6 1007.1 1010.4 ****** ****** ****** ****** DAY ** ** 17 24 5 29 3 1 11 ** ** ** MEAN QFF PRESSURE IN HPA ****** ****** 1008.6 1005.2 1002.8 996.3 991.9 998.1 999.1 ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** 1016.0 1010.2 1009.7 1003.4 995.3 1004.2 1006.5 ****** ****** ****** ****** DAY ** ** 28 15 23 10 13 24 16 ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** 999.8 1000.1 995.0 988.1 986.3 992.1 995.5 ****** ****** ****** ****** DAY ** ** 17 23 5 29 3 1 9 ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1973 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -4.7 5.6 9.3 14.7 20.3 27.0 29.0 28.1 23.6 18.8 8.8 2.5 15.2 MINIMUN AIR TEMPERATURE (C) -9.6 0.7 2.8 7.7 11.1 16.5 18.9 17.7 13.4 9.7 1.6 -2.4 7.3 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 5 4 2 0 0 0 0 11 DAYS WITH MINIMUM TEMP. <=-4 28 3 2 0 0 0 0 0 0 0 7 10 50 DAYS WITH FREEZING MIN.<= 0 31 11 8 0 0 0 0 0 0 0 14 24 88 TEMPERATURE RECORDS LOWEST(C) -17.0 -7.0 -5.0 3.0 6.0 11.0 17.0 16.0 9.0 6.0 -6.0 -8.0 -17.0 DAY 4 7 10 6 1 6 1 14 27 19 8 31 MAXIMUM AIR TEMPERATURE (C) 0.8 10.8 15.3 20.5 26.4 33.8 36.5 35.3 31.7 26.3 15.6 8.8 21.8 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 5 29 31 31 21 2 0 0 119 DAYS WITH MAXIMUM TEMP. <= 0 18 0 0 0 0 0 0 0 0 0 0 3 21 TEMPERATURE RECORDS HIGHEST(C) 11.0 19.0 21.0 26.0 33.0 39.0 41.0 38.0 36.0 30.0 22.0 15.0 41.0 DAY 28 28 2 27 29 27 15 1 4 7 1 2 DIF. BETWEEN (MAX.-MIN.) (C) 10.4 10.1 12.5 12.8 15.3 17.3 17.6 17.6 18.3 16.6 14.0 11.2 14.5 MEAN DAILY TEMP. (MDT) (C) -4.4 5.7 9.0 14.1 18.7 25.1 27.7 26.5 22.5 18.0 8.6 3.2 14.6 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 8.0 125.5 207.5 170.0 66.5 0.0 0.0 0.0 577.5 HEATING DEG. DAYS(BASE 18 0C) 693.5 343.0 278.0 124.5 25.0 0.0 0.0 0.0 1.5 22.0 282.0 386.5 2156.0 DEWPOINT (MEAN C) -9.0 -2.0 -6.0 -3.6 -1.1 0.7 7.0 2.3 0.2 -2.2 -7.6 -6.4 -2.3 MIXING RATIO (G/KG) 2.50 4.14 3.17 3.82 4.52 5.06 8.03 5.60 4.86 4.04 2.83 2.95 4.29 VAPOUR PRESSURE (HPA) 3.29 5.44 4.16 5.00 5.93 6.61 10.43 7.34 6.38 5.34 3.74 3.89 5.63 SATURATION DEF. (HPA) 1.30 4.21 8.06 12.53 18.99 30.99 31.62 32.50 24.68 17.38 8.37 3.84 16.21 RELATIVE HUMIDITY (MEAN %) 73 63 38 33 27 20 28 21 24 26 35 56 37 RELATIVE HUMIDITY (MAX. %) 84 78 60 57 47 36 43 39 40 41 56 74 55 RELATIVE HUMIDITY (MIN. %) 63 47 23 19 16 12 19 12 14 16 21 41 25 RELATIVE HUMIDITY (MEAN% 03UTC) 81 75 58 52 47 36 42 39 38 40 54 71 53 RELATIVE HUMIDITY (MEAN% 09UTC) 66 58 30 26 19 15 22 14 18 18 25 46 30 RELATIVE HUMIDITY (MEAN% 15UTC) 73 56 30 26 20 13 23 14 17 22 31 51 31 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 32.1 22.6 19.9 19.8 4.0 0.0 0.7 0.0 0.0 0.0 11.3 17.7 128.1 DAYS WITH PRECIPITATION >=10 0 0 0 1 0 0 0 0 0 0 0 0 1 DAYS WITH PRECIPITATION >= 5 4 3 2 1 0 0 0 0 0 0 1 2 13 DAYS WITH PRECIPITATION >= 1 6 4 4 7 2 0 0 0 0 0 3 2 28 DAYS WITH PRECIPITATION 12 6 5 10 3 0 4 0 0 0 4 4 48 GREATEST DAILY PRECIPITATION 9.0 8.0 9.0 10.1 3.0 0.0 0.6 0.0 0.0 0.0 8.0 9.0 10.1 DAY 29 10 3 16 10 ** 24 ** ** ** 23 30 DAY WITH THUNDER STORM 0 0 0 2 2 0 2 0 0 0 0 0 6 DAYS WITH SNOW OR SLEET 7 2 1 0 0 0 0 0 0 0 0 3 13 DAYS WITH DUST 0 0 0 1 0 1 0 0 2 1 0 0 5 WIND DIRECTION (PREVAILING) 270 270 270 270 270 270 90 90 270 270 270 225 270 PREVAILING WIND SPEED(KNOTS) 8.7 12.6 11.2 14.5 10.7 8.6 6.3 7.5 8.1 10.2 10.4 7.3 11.0 PREVAILING WIND PERCENT 14.5 31.5 45.7 48.3 40.9 21.7 19.4 31.7 15.0 30.1 25.1 11.1 24.5 CALMS PERCENT OF WIND 78.5 56.5 31.7 37.2 44.6 47.8 46.8 39.2 59.4 50.5 57.5 74.1 51.7 NO. OF WIND OBSERVATION 186 168 186 180 186 180 186 186 180 186 179 162 2165 VECTOR WIND DIRECTION (MEAN) 266 267 262 261 267 270 86 77 305 266 260 246 264 VECTOR WIND MAGNITUDE(KNOTS) 1.3 4.3 6.5 7.8 4.9 0.6 1.3 3.5 0.4 3.2 3.4 1.5 2.4 WIND STEADINESES (MEAN %) 72.2 91.5 90.3 92.9 87.5 15.0 35.1 77.8 13.3 74.4 85.0 78.9 54.5 WIND SPEED (MEAN KNOTS) 1.8 4.7 7.2 8.4 5.6 4.0 3.7 4.5 3.0 4.3 4.0 1.9 4.4 FASTEST WIND DIRECTION 260 260 290 260 270 260 330 90 240 270 260 260 260 FASTEST WIND SPEED (KNOTS) 18 30 24 34 20 15 15 16 15 25 20 17 34 DAY 16 22 18 21 3 3 23 13 1 30 5 17 DAYS WITH SKY CLEAR (0-2)/8 14 11 16 10 22 26 26 29 28 25 22 17 246 DAYS WITH P.CLOUDY (3-6)/8 10 12 9 16 8 3 5 2 2 6 5 7 85 DAYS WITH CLOUDY (7-8)/8 6 5 6 4 1 1 0 0 0 0 3 4 30 DAYS WITH VISIBILITY =< 2 KM 10 2 0 0 0 0 0 0 1 1 0 2 16 DURATION OF SUNSHINE HOURS 159.7 177.1 253.8 260.6 337.7 344.4 353.0 354.0 312.3 275.7 226.9 166.4 3221.6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1973 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 825.2 823.5 822.6 821.5 822.7 819.9 818.1 822.1 824.3 827.4 826.1 825.8 823.3 MAX. QFE PRESSURE IN HPA 835.0 830.6 831.7 826.9 828.6 826.8 824.2 826.8 830.8 833.9 833.0 832.8 835.0 DAY-HOUR 3- 6 6-18 10- 6 13- 6 7- 6 3- 6 23- 6 22- 6 29- 6 6- 6 12- 6 26- 6 MIN. QFE PRESSURE IN HPA 811.4 805.8 814.9 814.4 817.5 815.5 811.1 817.2 818.1 822.0 819.4 817.5 805.8 DAY-HOUR 15-15 22-12 3-15 8-12 29-12 15-15 15-15 28-12 2-15 30- 3 23-15 17-12 MEAN QNH PRESSURE IN HPA 1014.2 1012.2 1011.1 1009.8 1011.2 1007.9 1005.8 1010.5 1013.1 1016.7 1015.3 1014.9 1011.9 MAX. QNH PRESSURE IN HPA 1025.7 1020.5 1021.8 1016.2 1018.2 1016.0 1013.0 1016.0 1020.8 1024.4 1023.4 1023.1 1025.7 DAY-HOUR 3- 6 6-18 10- 6 13- 6 7- 6 3- 6 23- 6 22- 6 29- 6 6- 6 12- 6 26- 6 MIN. QNH PRESSURE IN HPA 997.8 991.2 1002.0 1001.4 1005.1 1002.7 997.5 1004.7 1005.8 1010.4 1007.3 1005.1 991.2 DAY-HOUR 15-15 22-12 3-15 8-12 29-12 15-15 15-15 28-12 2-15 30- 3 23-15 17-12 MEAN QFF PRESSURE IN HPA 1022.3 ****** 1008.4 1003.2 1001.0 993.6 989.8 995.5 1001.3 1008.2 1013.5 ****** ****** MAX. QFF PRESSURE IN HPA 1038.9 ****** 1025.5 1011.9 1009.8 1002.5 999.0 1000.8 1011.9 1015.2 1023.3 ****** ****** DAY-HOUR 3- 6 **-** 10- 6 10- 3 7- 3 2-18 23- 3 22- 3 27- 6 6- 6 7- 3 **-** MIN. QFF PRESSURE IN HPA 1001.3 ****** 996.6 994.4 991.8 985.6 979.5 989.7 991.6 1001.5 1000.1 ****** ****** DAY-HOUR 15-15 **-** 3-15 28- 6 29-18 29-15 15-15 3-15 2-15 30- 3 4-15 **-** 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 825.5 823.5 823.3 821.9 823.4 821.0 819.2 823.1 825.2 827.9 826.5 826.1 823.9 MAX. QFE PRESSURE IN HPA 833.6 829.6 830.7 826.0 827.8 826.1 823.5 826.3 830.2 832.9 831.9 831.9 833.6 DAY 26 12 10 13 7 3 23 22 29 6 12 26 MIN. QFE PRESSURE IN HPA 814.4 809.8 817.8 817.6 819.6 817.6 815.3 820.8 821.5 822.0 820.9 819.4 809.8 DAY 16 22 22 8 30 16 9 28 2 30 4 18 MEAN QNH PRESSURE IN HPA 1014.5 1012.2 1011.9 1010.3 1012.0 1009.2 1007.1 1011.7 1014.2 1017.4 1015.7 1015.2 1012.6 MAX. QNH PRESSURE IN HPA 1024.1 1019.4 1020.7 1015.1 1017.2 1015.2 1012.1 1015.5 1020.1 1023.3 1022.1 1022.1 1024.1 DAY 26 12 10 13 7 3 23 22 29 6 12 26 MIN. QNH PRESSURE IN HPA 1001.4 996.0 1005.4 1005.2 1007.5 1005.2 1002.5 1009.0 1009.8 1010.4 1009.1 1007.3 996.0 DAY 16 22 22 8 30 16 9 28 2 30 4 18 MEAN QFF PRESSURE IN HPA 1022.5 1011.7 1009.1 1003.8 1002.1 995.0 991.3 996.8 1002.2 1008.8 1013.7 1017.0 1006.2 MAX. QFF PRESSURE IN HPA 1036.4 1025.3 1023.6 1011.9 1009.8 1002.4 999.0 1000.8 1011.8 1014.3 1023.3 1025.5 1036.4 DAY 3 7 10 10 7 2 23 22 29 23 7 24 MIN. QFF PRESSURE IN HPA 1005.4 991.1 997.6 995.5 994.9 988.5 985.0 992.2 995.5 1001.5 1000.5 1004.9 985.0 DAY 16 22 22 28 30 29 16 4 2 30 4 18 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1973 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 826.5 824.3 824.1 822.5 823.8 821.4 819.5 823.6 825.9 828.8 827.5 827.1 824.6 MAX. QFE PRESSURE IN HPA 835.0 830.2 831.7 826.9 828.6 826.8 824.2 826.8 830.8 833.9 833.0 832.8 835.0 DAY 3 12 10 13 7 3 23 22 29 6 12 26 MIN. QFE PRESSURE IN HPA 815.8 808.7 818.7 817.7 819.4 817.8 815.4 820.8 821.7 823.3 821.8 820.3 808.7 DAY 13 22 22 8 30 16 9 9 2 30 4 18 MEAN QNH PRESSURE IN HPA 1015.7 1013.1 1012.9 1011.0 1012.4 1009.7 1007.4 1012.3 1015.0 1018.4 1016.9 1016.4 1013.4 MAX. QNH PRESSURE IN HPA 1025.7 1020.1 1021.8 1016.2 1018.2 1016.0 1013.0 1016.0 1020.8 1024.4 1023.4 1023.1 1025.7 DAY 3 12 10 13 7 3 23 22 29 6 12 26 MIN. QNH PRESSURE IN HPA 1003.0 994.7 1006.5 1005.3 1007.3 1005.4 1002.6 1009.0 1010.0 1011.9 1010.1 1008.4 994.7 DAY 13 22 22 8 30 16 9 9 2 30 4 18 MEAN QFF PRESSURE IN HPA 1023.8 1012.7 1009.6 1003.7 1001.4 994.6 990.8 996.4 1002.5 1009.2 1014.5 1018.7 1006.5 MAX. QFF PRESSURE IN HPA 1038.9 1025.7 1025.5 1011.6 1009.7 1002.0 997.1 1000.1 1011.9 1015.2 1022.7 1027.9 1038.9 DAY 3 7 10 10 7 2 23 7 27 6 26 25 MIN. QFF PRESSURE IN HPA 1005.3 990.6 999.3 994.4 993.1 988.7 985.3 992.4 995.2 1002.9 1001.8 1005.8 985.3 DAY 13 22 22 28 30 29 15 4 2 29 4 18 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 825.5 823.9 823.1 821.7 822.8 820.2 818.4 822.4 824.6 827.6 826.2 826.1 823.5 MAX. QFE PRESSURE IN HPA 834.5 829.7 831.0 825.9 828.0 826.0 822.8 825.8 829.9 832.3 831.5 832.3 834.5 DAY 3 12 10 13 7 3 22 22 29 6 12 26 MIN. QFE PRESSURE IN HPA 814.0 807.1 817.9 815.8 818.6 816.8 814.3 819.5 820.3 822.8 820.7 818.7 807.1 DAY 15 22 6 8 29 15 9 28 2 29 4 17 MEAN QNH PRESSURE IN HPA 1014.5 1012.7 1011.6 1010.0 1011.3 1008.3 1006.1 1010.9 1013.4 1017.0 1015.3 1015.2 1012.2 MAX. QNH PRESSURE IN HPA 1025.1 1019.5 1021.0 1015.0 1017.5 1015.1 1011.3 1014.9 1019.7 1022.5 1021.6 1022.5 1025.1 DAY 3 12 10 13 7 3 22 22 29 6 12 26 MIN. QNH PRESSURE IN HPA 1000.9 992.8 1005.5 1003.0 1006.4 1004.2 1001.3 1007.4 1008.4 1011.3 1008.8 1006.5 992.8 DAY 15 22 6 8 29 15 9 28 2 29 4 17 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 824.2 822.7 821.3 820.4 821.6 818.7 816.7 820.8 822.8 826.1 824.9 824.6 822.1 MAX. QFE PRESSURE IN HPA 833.1 828.2 828.7 824.2 826.5 825.5 821.3 824.2 827.9 830.6 829.8 830.5 833.1 DAY 3 11 10 10 7 3 22 22 29 5 12 26 MIN. QFE PRESSURE IN HPA 812.1 805.8 815.1 814.4 817.5 815.6 812.3 817.2 818.5 822.5 819.6 817.5 805.8 DAY 15 22 3 8 29 15 15 28 2 29 23 17 MEAN QNH PRESSURE IN HPA 1013.0 1011.2 1009.6 1008.5 1009.9 1006.5 1004.1 1008.9 1011.3 1015.3 1013.9 1013.5 1010.5 MAX. QNH PRESSURE IN HPA 1023.5 1017.7 1018.3 1013.0 1015.7 1014.5 1009.6 1013.0 1017.4 1020.5 1019.6 1020.4 1023.5 DAY 3 11 10 10 7 3 22 22 29 5 12 26 MIN. QNH PRESSURE IN HPA 998.7 991.2 1002.2 1001.4 1005.1 1002.8 998.9 1004.7 1006.2 1011.0 1007.5 1005.1 991.2 DAY 15 22 3 8 29 15 15 28 2 29 23 17 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1973 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 824.4 822.9 821.4 820.7 821.5 818.5 816.5 820.6 822.8 826.3 825.4 824.9 822.2 MAX. QFE PRESSURE IN HPA 832.6 828.6 828.7 824.2 826.1 825.5 823.5 823.9 827.7 831.0 830.0 830.9 832.6 DAY 3 11 10 10 7 3 22 22 29 5 12 26 MIN. QFE PRESSURE IN HPA 811.4 806.0 814.9 815.2 817.7 815.5 811.1 817.5 818.1 822.5 819.4 818.4 806.0 DAY 15 22 3 8 29 15 15 28 2 29 23 17 MEAN QNH PRESSURE IN HPA 1013.2 1011.5 1009.7 1008.8 1009.8 1006.2 1003.9 1008.7 1011.3 1015.5 1014.3 1013.9 1010.6 MAX. QNH PRESSURE IN HPA 1022.9 1018.2 1018.3 1013.0 1015.2 1014.5 1012.1 1012.6 1017.1 1021.0 1019.8 1020.9 1022.9 DAY 3 11 10 10 7 3 22 22 29 5 12 26 MIN. QNH PRESSURE IN HPA 997.8 991.5 1002.0 1002.3 1005.3 1002.7 997.5 1005.1 1005.8 1011.0 1007.3 1006.1 991.5 DAY 15 22 3 8 29 15 15 28 2 29 23 17 MEAN QFF PRESSURE IN HPA 1021.0 1010.7 1006.9 1002.2 999.9 992.0 987.9 994.0 999.4 1006.9 1012.4 1015.8 1004.1 MAX. QFF PRESSURE IN HPA 1036.1 1021.3 1020.3 1009.9 1007.7 1001.6 998.2 998.5 1008.2 1012.3 1020.7 1024.5 1036.1 DAY 3 7 10 11 7 2 22 22 29 22 26 26 MIN. QFF PRESSURE IN HPA 1001.3 987.1 996.6 994.5 993.1 985.6 979.5 989.7 991.6 1002.0 1000.1 1003.4 979.5 DAY 15 22 3 21 29 29 15 3 2 29 4 17 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 825.3 823.9 822.7 822.1 823.0 819.9 818.2 822.3 824.8 827.6 826.4 826.1 823.5 MAX. QFE PRESSURE IN HPA 833.8 830.6 829.7 826.1 827.6 826.4 823.5 825.3 829.3 833.5 830.8 831.9 833.8 DAY 3 6 9 11 7 2 22 22 28 5 11 26 MIN. QFE PRESSURE IN HPA 812.0 806.8 815.2 818.4 818.5 817.0 813.8 819.7 820.6 823.6 820.4 819.0 806.8 DAY 15 22 3 8 29 15 15 9 2 29 23 17 MEAN QNH PRESSURE IN HPA 1014.2 1012.6 1011.2 1010.5 1011.6 1007.9 1005.9 1010.8 1013.7 1017.0 1015.6 1015.3 1012.2 MAX. QNH PRESSURE IN HPA 1024.3 1020.5 1019.5 1015.2 1017.0 1015.6 1012.1 1014.3 1019.0 1024.0 1020.8 1022.1 1024.3 DAY 3 6 9 11 7 2 22 22 28 5 11 26 MIN. QNH PRESSURE IN HPA 998.6 992.4 1002.3 1006.1 1006.2 1004.5 1000.7 1007.7 1008.7 1012.3 1008.5 1006.8 992.4 DAY 15 22 3 8 29 15 15 9 2 29 23 17 MEAN QFF PRESSURE IN HPA 1022.0 1012.1 1007.9 1003.2 1000.5 992.8 989.3 994.9 1001.2 1007.8 1013.3 1017.8 1005.2 MAX. QFF PRESSURE IN HPA 1036.9 1024.2 1023.1 1011.4 1008.2 1002.5 996.2 998.8 1010.1 1013.8 1021.3 1026.6 1036.9 DAY 3 6 9 11 7 2 22 22 28 5 25 24 MIN. QFF PRESSURE IN HPA 1002.3 988.5 996.8 995.9 991.8 987.0 982.2 990.9 994.2 1002.7 1000.5 1003.8 982.2 DAY 15 22 3 21 29 29 15 9 1 29 4 17 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 ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1974 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -4.9 -4.9 7.6 13.7 21.1 26.3 26.3 26.2 22.0 15.0 10.5 -1.2 13.1 MINIMUN AIR TEMPERATURE (C) -8.1 -9.4 3.1 7.5 12.1 16.6 18.3 17.2 13.1 6.8 4.4 -4.5 6.4 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 2 6 0 0 0 0 0 8 DAYS WITH MINIMUM TEMP. <=-4 29 20 3 0 0 0 0 0 0 0 0 17 69 DAYS WITH FREEZING MIN.<= 0 31 26 10 1 0 0 0 0 0 0 3 30 101 TEMPERATURE RECORDS LOWEST(C) -18.0 -28.0 -6.0 -2.0 6.0 13.0 14.0 12.0 9.0 3.0 -3.0 -12.0 -28.0 DAY 30 5 2 11 2 5 8 31 26 17 28 28 MAXIMUM AIR TEMPERATURE (C) -1.1 -0.2 12.4 19.2 27.9 33.7 33.6 34.1 29.7 23.3 16.9 3.1 19.4 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 12 28 30 29 17 0 0 0 116 DAYS WITH MAXIMUM TEMP. <= 0 24 16 1 0 0 0 0 0 0 0 0 10 51 TEMPERATURE RECORDS HIGHEST(C) 5.0 7.0 24.0 26.0 32.0 38.0 37.0 37.0 32.0 26.0 24.0 12.0 38.0 DAY 16 12 22 19 25 20 2 13 1 1 1 1 DIF. BETWEEN (MAX.-MIN.) (C) 7.0 9.2 9.3 11.7 15.8 17.1 15.3 16.9 16.6 16.5 12.5 7.6 13.0 MEAN DAILY TEMP. (MDT) (C) -4.6 -4.8 7.7 13.4 20.0 25.2 26.0 25.6 21.4 15.0 10.7 -0.7 12.9 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.5 21.0 125.0 154.5 144.0 27.5 0.0 0.0 0.0 472.5 HEATING DEG. DAYS(BASE 18 0C) 700.0 639.0 318.0 145.0 15.5 0.0 0.0 0.0 0.0 91.5 220.0 581.0 2710.0 DEWPOINT (MEAN C) -7.1 -7.3 1.9 -2.2 1.4 3.7 7.0 4.8 1.9 -2.9 -3.0 -5.5 -0.6 MIXING RATIO (G/KG) 2.84 3.00 5.48 4.13 5.26 6.26 7.90 6.78 5.44 3.91 3.81 3.16 4.83 VAPOUR PRESSURE (HPA) 3.73 3.95 7.19 5.40 6.90 8.17 10.26 8.84 7.14 5.16 5.04 4.17 6.33 SATURATION DEF. (HPA) 0.66 0.76 4.04 11.31 19.46 27.74 25.47 26.82 20.64 12.77 8.31 1.64 13.30 RELATIVE HUMIDITY (MEAN %) 85 84 70 39 30 25 32 28 29 31 42 75 48 RELATIVE HUMIDITY (MAX. %) 91 91 84 58 48 39 48 41 46 45 57 85 61 RELATIVE HUMIDITY (MIN. %) 77 76 58 25 17 16 20 17 17 21 30 64 37 RELATIVE HUMIDITY (MEAN% 03UTC) 87 89 81 53 48 38 47 40 43 44 54 79 59 RELATIVE HUMIDITY (MEAN% 09UTC) 82 80 64 32 22 20 24 22 21 24 33 68 41 RELATIVE HUMIDITY (MEAN% 15UTC) 86 83 65 33 22 19 27 20 22 26 38 76 43 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 106.8 95.2 26.2 37.2 7.3 0.0 4.5 0.0 0.6 0.3 7.8 81.0 366.9 DAYS WITH PRECIPITATION >=10 6 4 1 1 0 0 0 0 0 0 0 1 13 DAYS WITH PRECIPITATION >= 5 9 6 2 2 1 0 0 0 0 0 1 7 28 DAYS WITH PRECIPITATION >= 1 14 16 8 7 1 0 2 0 0 0 2 10 60 DAYS WITH PRECIPITATION 21 17 14 9 2 0 7 0 2 2 3 10 87 GREATEST DAILY PRECIPITATION 15.3 18.0 10.1 21.0 7.0 0.0 3.0 0.0 0.6 0.3 5.2 38.0 38.0 DAY 16 18 31 10 4 ** 7 ** 6 12 21 5 DAY WITH THUNDER STORM 0 0 0 1 1 1 3 0 1 0 0 0 7 DAYS WITH SNOW OR SLEET 18 11 1 1 0 0 0 0 0 0 0 5 36 DAYS WITH DUST 0 0 0 0 0 0 0 0 0 0 0 0 0 WIND DIRECTION (PREVAILING) 225 225 225 270 225 270 45 45 270 225 225 270 225 PREVAILING WIND SPEED(KNOTS) 5.4 7.1 6.7 11.2 7.1 7.5 7.6 7.4 8.2 6.0 7.8 9.3 7.7 PREVAILING WIND PERCENT 2.7 4.8 11.3 39.4 25.8 16.7 22.0 25.8 20.6 14.5 25.0 10.2 14.0 CALMS PERCENT OF WIND 91.9 95.2 73.7 26.7 49.5 58.9 51.6 40.9 40.0 58.6 55.0 78.0 59.9 NO. OF WIND OBSERVATION 186 168 186 180 186 180 186 186 180 186 180 186 2190 VECTOR WIND DIRECTION (MEAN) 256 227 252 251 248 250 53 62 256 276 242 255 252 VECTOR WIND MAGNITUDE(KNOTS) 0.2 0.3 1.5 7.2 2.9 1.6 1.7 1.2 2.2 0.1 2.8 1.3 1.4 WIND STEADINESES (MEAN %) 40.0 100.0 75.0 91.1 80.6 55.2 50.0 27.3 51.2 4.2 75.7 76.5 45.2 WIND SPEED (MEAN KNOTS) 0.5 0.3 2.0 7.9 3.6 2.9 3.4 4.4 4.3 2.4 3.7 1.7 3.1 FASTEST WIND DIRECTION 270 230 270 260 210 250 270 240 250 270 260 270 260 FASTEST WIND SPEED (KNOTS) 14 12 16 25 16 16 14 15 15 14 16 14 25 DAY 25 25 27 27 22 2 4 8 17 29 3 6 DAYS WITH SKY CLEAR (0-2)/8 3 5 1 7 16 30 19 28 25 23 15 13 185 DAYS WITH P.CLOUDY (3-6)/8 7 7 11 16 14 0 12 3 5 8 12 9 104 DAYS WITH CLOUDY (7-8)/8 21 16 19 7 1 0 0 0 0 0 3 9 76 DAYS WITH VISIBILITY =< 2 KM 15 13 2 1 0 0 0 0 0 0 0 10 41 DURATION OF SUNSHINE HOURS 73.4 84.7 115.7 219.1 319.9 359.1 311.8 349.8 304.5 284.7 221.2 147.9 2791.8 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1974 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 821.3 823.0 823.6 819.9 822.7 820.0 818.9 819.8 823.3 827.6 827.2 823.8 822.6 MAX. QFE PRESSURE IN HPA 830.7 829.3 829.9 826.1 826.7 824.6 824.4 824.3 827.9 832.7 834.3 829.3 834.3 DAY-HOUR 5- 6 6- 6 15- 6 26- 6 9- 6 22- 6 23- 6 4- 6 9- 6 23- 6 18- 6 21- 6 MIN. QFE PRESSURE IN HPA 808.5 814.2 815.4 814.9 816.7 815.8 810.9 813.7 816.2 823.9 820.3 812.8 808.5 DAY-HOUR 21-15 11-18 31-12 27-12 27-15 26-15 4-12 16-15 1-12 9-12 24-15 5-15 MEAN QNH PRESSURE IN HPA 1009.5 1011.6 1012.2 1007.9 1011.1 1008.0 1006.8 1007.7 1011.9 1017.0 1016.6 1012.5 1011.1 MAX. QNH PRESSURE IN HPA 1020.7 1019.0 1019.7 1015.2 1015.9 1013.5 1013.2 1013.1 1017.4 1023.0 1024.9 1019.0 1024.9 DAY-HOUR 5- 6 6- 6 15- 6 26- 6 9- 6 22- 6 23- 6 4- 6 9- 6 23- 6 18- 6 21- 6 MIN. QNH PRESSURE IN HPA 994.4 1001.2 1002.6 1002.0 1004.1 1003.0 997.3 1000.6 1003.5 1012.6 1008.4 999.5 994.4 DAY-HOUR 21-15 11-18 31-12 27-12 27-15 26-15 4-12 16-15 1-12 9-12 24-15 5-15 MEAN QFF PRESSURE IN HPA 1016.7 ****** 1010.2 1001.7 1000.5 994.0 992.4 993.9 1001.0 1011.2 1013.3 1017.0 ****** MAX. QFF PRESSURE IN HPA 1030.2 ****** 1021.7 1010.2 1007.3 998.9 999.6 999.9 1006.3 1018.8 1023.1 1026.7 ****** DAY-HOUR 4- 6 **-** 6- 6 12-18 2- 6 14- 6 23- 6 26- 6 30- 6 15- 6 18- 6 21- 6 MIN. QFF PRESSURE IN HPA 1000.6 ****** 1000.3 992.9 991.5 988.5 980.9 985.0 991.2 1004.8 1003.6 1001.0 ****** DAY-HOUR 24-15 **-** 24-15 27-15 27-15 20-15 4-15 16-15 2-15 2-15 24-15 5-15 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 821.3 823.0 823.6 820.1 823.3 821.0 819.9 820.8 824.0 828.1 827.7 823.8 823.0 MAX. QFE PRESSURE IN HPA 829.9 828.3 828.6 825.2 826.0 823.6 823.7 823.9 827.4 831.8 833.0 828.7 833.0 DAY 5 6 15 17 8 22 23 3 9 15 18 21 MIN. QFE PRESSURE IN HPA 811.8 815.2 817.0 815.6 818.2 818.2 814.2 816.8 818.7 825.7 821.7 816.5 811.8 DAY 18 12 1 29 27 26 4 16 2 9 24 13 MEAN QNH PRESSURE IN HPA 1009.5 1011.5 1012.3 1008.1 1011.9 1009.2 1007.9 1008.9 1012.8 1017.6 1017.1 1012.5 1011.6 MAX. QNH PRESSURE IN HPA 1019.7 1017.8 1018.2 1014.2 1015.1 1012.3 1012.4 1012.6 1016.8 1022.0 1023.4 1018.3 1023.4 DAY 5 6 15 17 8 22 23 3 9 15 18 21 MIN. QNH PRESSURE IN HPA 998.3 1002.3 1004.5 1002.8 1005.9 1005.9 1001.2 1004.2 1006.5 1014.8 1010.0 1003.9 998.3 DAY 18 12 1 29 27 26 4 16 2 9 24 13 MEAN QFF PRESSURE IN HPA 1016.5 1019.0 1010.0 1001.7 1001.3 995.1 993.3 994.6 1001.5 1011.3 1013.2 1016.6 1006.2 MAX. QFF PRESSURE IN HPA 1028.1 1037.6 1020.3 1008.8 1006.7 998.7 998.6 999.0 1005.5 1017.9 1020.9 1024.4 1037.6 DAY 26 6 7 13 2 4 23 26 7 15 18 21 MIN. QFF PRESSURE IN HPA 1002.8 1007.7 1000.4 995.1 993.3 991.0 984.8 989.3 993.7 1005.8 1005.3 1004.8 984.8 DAY 22 26 31 29 28 20 4 16 2 1 24 6 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1974 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 822.2 824.0 824.4 820.8 823.7 821.4 820.1 821.2 824.6 829.0 828.5 824.8 823.7 MAX. QFE PRESSURE IN HPA 830.7 829.3 829.9 826.1 826.7 824.6 824.4 824.3 827.9 832.7 834.3 829.3 834.3 DAY 5 6 15 26 9 22 23 4 9 23 18 21 MIN. QFE PRESSURE IN HPA 812.7 816.5 817.5 817.2 818.4 818.2 814.5 817.0 819.1 826.4 821.8 817.0 812.7 DAY 22 12 31 11 27 26 4 16 2 9 24 5 MEAN QNH PRESSURE IN HPA 1010.7 1012.8 1013.3 1009.0 1012.4 1009.7 1008.2 1009.4 1013.5 1018.7 1018.1 1013.6 1012.4 MAX. QNH PRESSURE IN HPA 1020.7 1019.0 1019.7 1015.2 1015.9 1013.5 1013.2 1013.1 1017.4 1023.0 1024.9 1019.0 1024.9 DAY 5 6 15 26 9 22 23 4 9 23 18 21 MIN. QNH PRESSURE IN HPA 999.4 1003.9 1005.1 1004.7 1006.1 1005.9 1001.5 1004.5 1006.9 1015.6 1010.1 1004.5 999.4 DAY 22 12 31 11 27 26 4 16 2 9 24 5 MEAN QFF PRESSURE IN HPA 1017.8 1020.6 1011.3 1002.7 1001.4 995.2 993.4 995.3 1002.2 1012.8 1014.7 1018.2 1007.1 MAX. QFF PRESSURE IN HPA 1030.2 1039.5 1021.7 1009.8 1007.3 998.9 999.6 999.9 1006.3 1018.8 1023.1 1026.7 1039.5 DAY 4 6 6 13 2 14 23 26 30 15 18 21 MIN. QFF PRESSURE IN HPA 1002.4 1007.6 1001.2 996.2 992.5 990.4 984.8 989.4 995.0 1007.9 1004.6 1006.1 984.8 DAY 22 26 24 20 27 20 4 16 2 1 24 5 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 821.6 823.5 823.8 820.0 822.8 820.3 819.0 819.9 823.3 827.9 827.4 824.1 822.8 MAX. QFE PRESSURE IN HPA 830.0 828.6 829.3 825.0 825.8 823.8 824.0 823.5 826.4 831.7 832.8 828.4 832.8 DAY 5 6 10 18 8 22 23 4 9 23 18 21 MIN. QFE PRESSURE IN HPA 810.6 815.7 817.0 816.0 817.7 817.0 812.3 815.8 817.8 825.3 821.2 814.4 810.6 DAY 21 12 31 14 27 26 4 16 2 9 24 5 MEAN QNH PRESSURE IN HPA 1009.9 1012.2 1012.5 1008.1 1011.4 1008.3 1006.9 1007.9 1012.0 1017.3 1016.7 1012.8 1011.3 MAX. QNH PRESSURE IN HPA 1019.8 1018.2 1019.0 1013.9 1014.9 1012.5 1012.7 1012.1 1015.6 1021.8 1023.1 1017.9 1023.1 DAY 5 6 10 18 8 22 23 4 9 23 18 21 MIN. QNH PRESSURE IN HPA 996.9 1002.9 1004.5 1003.3 1005.3 1004.5 998.9 1003.0 1005.4 1014.3 1009.4 1001.4 996.9 DAY 21 12 31 14 27 26 4 16 2 9 24 5 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 820.5 822.3 822.7 818.9 821.6 818.8 817.8 818.4 821.9 826.4 826.1 823.1 821.5 MAX. QFE PRESSURE IN HPA 829.0 827.4 827.9 824.1 824.4 821.7 822.4 822.0 825.2 829.8 830.7 827.2 830.7 DAY 5 3 10 18 8 22 23 4 8 23 17 21 MIN. QFE PRESSURE IN HPA 808.6 815.8 815.4 814.9 816.9 816.0 810.9 814.4 816.2 823.9 820.5 813.0 808.6 DAY 21 12 31 27 27 26 4 17 1 9 24 5 MEAN QNH PRESSURE IN HPA 1008.6 1010.7 1011.2 1006.7 1009.9 1006.6 1005.4 1006.1 1010.3 1015.6 1015.2 1011.7 1009.8 MAX. QNH PRESSURE IN HPA 1018.7 1016.8 1017.4 1012.9 1013.2 1010.0 1010.8 1010.4 1014.2 1019.6 1020.7 1016.5 1020.7 DAY 5 3 10 18 8 22 23 4 8 23 17 21 MIN. QNH PRESSURE IN HPA 994.5 1003.0 1002.6 1002.0 1004.3 1003.3 997.3 1001.4 1003.5 1012.6 1008.6 999.7 994.5 DAY 21 12 31 27 27 26 4 17 1 9 24 5 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** DAY ** ** ** ** ** ** ** ** ** ** ** ** ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1974 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 1500 UTC. MEAN QFE PRESSURE IN HPA 820.7 822.5 823.0 819.1 821.6 818.6 817.7 818.2 822.1 826.5 826.3 823.4 821.6 MAX. QFE PRESSURE IN HPA 829.0 827.5 827.9 823.4 824.9 820.9 821.8 821.4 825.2 829.6 831.3 827.6 831.3 DAY 5 4 10 18 12 22 23 26 8 14 17 20 MIN. QFE PRESSURE IN HPA 808.5 815.2 816.1 814.9 816.7 815.8 810.9 813.7 816.2 824.0 820.3 812.8 808.5 DAY 21 11 31 27 27 26 4 16 1 26 24 5 MEAN QNH PRESSURE IN HPA 1008.8 1010.9 1011.6 1007.0 1009.9 1006.4 1005.2 1005.8 1010.4 1015.7 1015.5 1012.0 1009.9 MAX. QNH PRESSURE IN HPA 1018.7 1016.9 1017.4 1012.0 1013.8 1009.1 1010.1 1009.7 1014.2 1019.4 1021.4 1017.0 1021.4 DAY 5 4 10 18 12 22 23 26 8 14 17 20 MIN. QNH PRESSURE IN HPA 994.4 1002.3 1003.4 1002.0 1004.1 1003.0 997.3 1000.6 1003.5 1012.7 1008.4 999.5 994.4 DAY 21 11 31 27 27 26 4 16 1 26 24 5 MEAN QFF PRESSURE IN HPA 1015.7 1018.2 1009.1 1000.4 999.1 992.1 990.6 991.5 999.1 1009.3 1011.6 1016.1 1004.4 MAX. QFF PRESSURE IN HPA 1027.5 1036.9 1020.0 1008.4 1004.9 995.4 995.6 997.3 1003.9 1015.4 1018.6 1024.9 1036.9 DAY 4 5 6 12 9 8 23 26 6 14 17 21 MIN. QFF PRESSURE IN HPA 1000.6 1006.5 1000.3 992.9 991.5 988.5 980.9 985.0 991.2 1004.8 1003.6 1001.0 980.9 DAY 24 12 24 27 27 20 4 16 2 2 24 5 PRESSURE AT HOUR 1800 UTC. MEAN QFE PRESSURE IN HPA 821.6 823.0 824.0 820.3 822.9 820.1 819.1 820.2 823.7 827.9 827.5 823.9 822.9 MAX. QFE PRESSURE IN HPA 829.0 828.2 828.6 824.9 825.9 822.5 822.8 823.4 826.7 831.5 833.4 828.0 833.4 DAY 5 3 14 16 12 14 23 3 8 14 17 18 MIN. QFE PRESSURE IN HPA 810.0 814.2 817.0 815.9 818.3 817.3 813.6 816.6 817.8 825.5 822.2 813.5 810.0 DAY 24 11 31 27 27 26 4 16 1 26 26 5 MEAN QNH PRESSURE IN HPA 1009.9 1011.5 1012.8 1008.4 1011.5 1008.1 1007.0 1008.2 1012.3 1017.4 1016.9 1012.6 1011.4 MAX. QNH PRESSURE IN HPA 1018.7 1017.7 1018.2 1013.8 1015.0 1011.0 1011.3 1012.0 1015.9 1021.6 1023.9 1017.5 1023.9 DAY 5 3 14 16 12 14 23 3 8 14 17 18 MIN. QNH PRESSURE IN HPA 996.2 1001.2 1004.5 1003.2 1006.0 1004.8 1000.4 1004.0 1005.4 1014.5 1010.6 1000.3 996.2 DAY 24 11 31 27 27 26 4 16 1 26 26 5 MEAN QFF PRESSURE IN HPA 1017.0 1019.1 1010.7 1002.0 1000.3 993.7 992.3 994.2 1001.2 1011.5 1013.6 1017.1 1006.1 MAX. QFF PRESSURE IN HPA 1029.0 1038.8 1021.1 1010.2 1005.0 998.0 997.3 999.1 1005.5 1017.7 1022.2 1024.6 1038.8 DAY 4 5 6 12 1 8 23 26 30 14 17 28 MIN. QFF PRESSURE IN HPA 1001.2 1008.3 1001.4 993.6 992.7 989.6 984.5 989.5 993.7 1007.2 1006.4 1001.6 984.5 DAY 24 12 24 27 27 20 4 16 1 2 24 5 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 ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1975 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL AIR TEMPERATURE (C) -0.2 2.1 8.1 15.3 18.5 26.3 30.6 28.3 23.5 14.9 6.2 0.3 14.5 MINIMUN AIR TEMPERATURE (C) -3.7 -2.6 2.5 7.7 10.7 16.5 20.7 18.4 14.0 6.5 1.8 -2.4 7.5 DAYS WITH MINIMUM TEMP. >=21 0 0 0 0 0 1 13 5 0 0 0 0 19 DAYS WITH MINIMUM TEMP. <=-4 20 10 1 0 0 0 0 0 0 0 1 12 44 DAYS WITH FREEZING MIN.<= 0 27 19 10 0 0 0 0 0 0 0 9 24 89 TEMPERATURE RECORDS LOWEST(C) -11.0 -12.0 -5.0 2.0 6.0 12.0 19.0 14.0 9.0 3.0 -4.0 -12.0 -12.0 DAY 29 12 9 4 7 15 3 27 28 18 8 7 MAXIMUM AIR TEMPERATURE (C) 4.3 7.2 14.2 22.2 24.9 34.0 38.8 37.0 32.0 23.4 11.9 4.6 21.2 DAYS WITH MAXIMUM TEMP. >=30 0 0 0 0 6 27 31 31 27 0 0 0 122 DAYS WITH MAXIMUM TEMP. <= 0 7 1 1 0 0 0 0 0 0 0 0 4 13 TEMPERATURE RECORDS HIGHEST(C) 10.0 16.0 22.0 27.0 33.0 41.0 41.0 41.0 36.0 27.0 20.0 10.0 41.0 DAY 10 23 23 13 29 30 6 1 7 2 1 13 DIF. BETWEEN (MAX.-MIN.) (C) 8.0 9.8 11.7 14.5 14.2 17.5 18.1 18.6 18.0 16.9 10.1 7.0 13.7 MEAN DAILY TEMP. (MDT) (C) 0.3 2.3 8.3 14.9 17.8 25.2 29.8 27.7 23.0 14.9 6.8 1.1 14.3 COOLING DEG. DAYS(BASE 21 0C) 0.0 0.0 0.0 0.0 9.5 127.5 271.5 206.5 69.0 0.0 0.0 0.0 684.0 HEATING DEG. DAYS(BASE 18 0C) 550.0 440.0 300.0 94.0 49.5 0.0 0.0 0.0 0.5 97.5 335.0 523.5 2390.0 DEWPOINT (MEAN C) -5.3 -5.5 -5.1 -0.6 4.1 3.9 4.4 4.3 2.1 -3.3 -2.1 -3.3 -0.5 MIXING RATIO (G/KG) 3.20 3.21 3.31 4.74 6.44 6.29 6.54 6.46 5.56 3.76 4.14 3.73 4.78 VAPOUR PRESSURE (HPA) 4.22 4.21 4.34 6.22 8.43 8.21 8.52 8.42 7.29 4.96 5.46 4.91 6.27 SATURATION DEF. (HPA) 2.06 3.32 7.31 12.14 14.29 28.14 37.58 32.21 23.38 13.03 4.49 1.55 14.96 RELATIVE HUMIDITY (MEAN %) 71 60 44 38 44 26 20 23 27 31 60 78 44 RELATIVE HUMIDITY (MAX. %) 82 76 67 57 66 42 31 35 38 43 73 90 58 RELATIVE HUMIDITY (MIN. %) 60 45 29 23 28 16 13 15 16 19 45 65 31 RELATIVE HUMIDITY (MEAN% 03UTC) 78 71 61 54 64 42 31 35 37 41 68 84 56 RELATIVE HUMIDITY (MEAN% 09UTC) 65 51 34 29 33 19 15 18 21 25 56 73 37 RELATIVE HUMIDITY (MEAN% 15UTC) 68 56 37 31 35 19 15 18 21 27 56 75 38 RH=0 => RELATIVE HUMIDITY < 0.5% AMOUNT OF PRECIPITATION MM. 60.3 26.7 43.3 18.0 60.5 2.0 0.0 0.0 0.0 0.2 61.5 113.9 386.4 DAYS WITH PRECIPITATION >=10 2 1 1 0 2 0 0 0 0 0 1 4 11 DAYS WITH PRECIPITATION >= 5 5 2 3 0 4 0 0 0 0 0 6 8 28 DAYS WITH PRECIPITATION >= 1 12 8 8 6 7 2 0 0 0 0 9 12 64 DAYS WITH PRECIPITATION 13 13 13 8 11 2 0 0 1 1 9 14 85 GREATEST DAILY PRECIPITATION 13.0 10.5 19.0 4.5 25.0 1.0 0.0 0.0 0.0 0.2 21.0 28.0 28.0 DAY 18 25 18 27 12 5 ** ** ** 1 11 23 DAY WITH THUNDER STORM 0 0 2 0 5 2 0 0 0 1 0 0 10 DAYS WITH SNOW OR SLEET 9 6 4 0 0 0 0 0 0 0 4 9 32 DAYS WITH DUST 0 0 0 0 0 0 0 1 0 0 0 0 1 WIND DIRECTION (PREVAILING) 270 225 270 225 270 45 45 45 225 225 225 225 225 PREVAILING WIND SPEED(KNOTS) 9.1 8.5 9.5 6.8 8.9 7.0 6.5 7.0 7.7 6.8 7.4 6.9 7.4 PREVAILING WIND PERCENT 11.3 24.4 30.1 16.1 19.9 18.9 18.8 28.0 21.7 24.7 18.8 10.1 16.4 CALMS PERCENT OF WIND 75.3 50.6 37.1 51.1 50.0 39.4 41.4 46.8 47.2 49.5 62.9 75.8 53.0 NO. OF WIND OBSERVATION 186 168 186 180 186 180 186 186 180 186 197 248 2269 VECTOR WIND DIRECTION (MEAN) 251 245 251 247 262 277 104 63 241 246 252 253 251 VECTOR WIND MAGNITUDE(KNOTS) 1.4 3.8 4.3 1.5 2.5 0.4 0.4 2.3 1.4 1.8 1.5 1.0 1.4 WIND STEADINESES (MEAN %) 70.0 88.4 78.2 45.5 65.8 8.7 10.0 60.5 35.9 54.5 57.7 55.6 38.9 WIND SPEED (MEAN KNOTS) 2.0 4.3 5.5 3.3 3.8 4.6 4.0 3.8 3.9 3.3 2.6 1.8 3.6 FASTEST WIND DIRECTION 270 210 270 270 330 250 270 60 270 210 240 240 240 FASTEST WIND SPEED (KNOTS) 15 15 18 16 15 17 14 15 18 18 18 25 25 DAY 5 10 15 20 20 14 2 13 23 15 1 24 DAYS WITH SKY CLEAR (0-2)/8 13 11 16 9 16 27 26 30 26 30 14 9 227 DAYS WITH P.CLOUDY (3-6)/8 8 11 10 14 11 3 4 1 4 1 12 7 86 DAYS WITH CLOUDY (7-8)/8 10 6 5 7 4 0 1 0 0 0 4 15 52 DAYS WITH VISIBILITY =< 2 KM 4 2 0 0 0 0 0 0 0 0 1 12 19 DURATION OF SUNSHINE HOURS 168.3 181.3 251.8 240.0 293.1 358.9 354.1 354.3 302.7 312.9 196.3 119.0 3132.7 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1975 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL MEAN QFE PRESSURE IN HPA 823.8 821.2 821.5 823.8 822.9 820.3 818.7 819.8 823.5 825.0 826.3 824.5 822.6 MAX. QFE PRESSURE IN HPA 832.3 830.2 829.7 832.0 829.2 825.2 824.2 825.6 830.9 831.7 831.4 830.5 832.3 DAY-HOUR 14-18 17- 6 23- 6 5- 6 19- 6 7- 6 28- 6 31- 6 18-18 25- 6 22- 6 25- 6 MIN. QFE PRESSURE IN HPA 816.5 812.1 812.1 816.3 818.1 814.8 812.6 812.4 814.6 818.9 814.7 816.0 812.1 DAY-HOUR 27-12 10-18 18-12 22-18 6- 9 30-15 17-15 14-12 9-12 13-12 28-15 23-12 MEAN QNH PRESSURE IN HPA 1012.4 1009.5 1009.7 1012.5 1011.5 1008.4 1006.4 1007.8 1012.1 1013.9 1015.4 1013.3 1011.1 MAX. QNH PRESSURE IN HPA 1022.5 1020.1 1019.5 1022.2 1018.9 1014.2 1013.0 1014.6 1020.9 1021.8 1021.5 1020.4 1022.5 DAY-HOUR 14-18 17- 6 23- 6 5- 6 19- 6 7- 6 28- 6 31- 6 18-18 25- 6 22- 6 25- 6 MIN. QNH PRESSURE IN HPA 1003.9 998.7 998.7 1003.6 1005.8 1001.9 999.3 999.0 1001.6 1006.7 1001.7 1003.3 998.7 DAY-HOUR 27-12 10-18 18-12 22-18 6- 9 30-15 17-15 14-12 9-12 13-12 28-15 23-12 MEAN QFF PRESSURE IN HPA 1016.2 ****** 1007.7 1005.7 1002.2 994.4 989.9 992.8 1000.4 1008.0 1013.7 1015.5 ****** MAX. QFF PRESSURE IN HPA 1028.2 ****** 1019.7 1017.5 1009.3 1002.1 995.5 1001.5 1009.8 1018.5 1021.7 1026.4 ****** DAY-HOUR 15- 6 **-** 9- 6 5- 6 19- 6 7- 3 28- 6 31- 6 18-18 25- 6 7- 6 7-18 MIN. QFF PRESSURE IN HPA 1006.5 ****** 992.4 994.9 996.9 984.2 982.4 982.4 988.1 998.3 998.6 1001.2 ****** DAY-HOUR 5- 3 **-** 27- 3 20- 3 24-18 30-15 17-15 14-15 9-15 4-15 28-15 23-12 PRESSURE AT HOUR 0000 UTC. MEAN QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 824.2 ****** MAX. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 829.8 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 25 MIN. QFE PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 817.9 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 23 MEAN QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1013.0 ****** MAX. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1019.6 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 25 MIN. QNH PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1005.5 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 23 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1014.7 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1024.7 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 8 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1003.7 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 23 PRESSURE AT HOUR 0300 UTC. MEAN QFE PRESSURE IN HPA 823.8 821.2 821.8 824.2 823.2 821.1 819.5 820.6 824.1 825.5 826.6 824.2 823.0 MAX. QFE PRESSURE IN HPA 831.5 829.1 828.3 831.2 827.9 824.7 824.0 824.6 829.9 830.6 830.5 829.4 831.5 DAY 15 17 23 5 19 7 28 31 19 25 22 26 MIN. QFE PRESSURE IN HPA 818.3 813.2 812.8 816.4 819.6 818.0 815.3 815.1 816.2 820.7 818.7 816.1 812.8 DAY 24 6 27 23 6 24 17 15 10 4 29 23 MEAN QNH PRESSURE IN HPA 1012.5 1009.5 1010.1 1012.9 1011.8 1009.4 1007.4 1008.7 1012.8 1014.5 1015.9 1013.0 1011.5 MAX. QNH PRESSURE IN HPA 1021.6 1018.8 1017.8 1021.3 1017.4 1013.6 1012.7 1013.5 1019.7 1020.5 1020.4 1019.1 1021.6 DAY 15 17 23 5 19 7 28 31 19 25 22 26 MIN. QNH PRESSURE IN HPA 1006.0 1000.0 999.5 1003.8 1007.5 1005.6 1002.5 1002.2 1003.5 1008.8 1006.5 1003.4 999.5 DAY 24 6 27 23 6 24 17 15 10 4 29 23 MEAN QFF PRESSURE IN HPA 1015.8 1011.5 1007.7 1005.9 1002.5 995.4 990.7 993.5 1000.8 1008.2 1014.4 1015.5 1005.1 MAX. QFF PRESSURE IN HPA 1026.6 1022.2 1018.5 1016.6 1008.2 1002.1 995.0 1000.6 1008.6 1016.5 1020.5 1025.7 1026.6 DAY 15 18 9 5 19 7 29 31 19 21 7 8 MIN. QFF PRESSURE IN HPA 1006.5 1001.7 992.4 994.9 997.7 988.7 985.3 985.2 990.0 999.6 1002.3 1001.9 985.2 DAY 5 6 27 20 24 30 17 15 10 2 1 23 ======================================================================================================================= TEHRAN 2006,MAY M.(S & A) STATION ARAK (40769) I.R OF IRAN METEOROLOGICAL ORGANIZATION (IRIMO) LATITUDE 34 6 N LONGITUDE 49 46 E DATA PROCESSING CENTER ELEVATION 1708.0 M MEANS AND EXTREMES FOR THE YEAR 1975 JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. ANNUAL PRESSURE AT HOUR 0600 UTC. MEAN QFE PRESSURE IN HPA 824.9 822.3 822.6 825.1 823.9 821.5 820.0 821.2 824.8 826.4 827.7 825.2 823.8 MAX. QFE PRESSURE IN HPA 832.3 830.2 829.7 832.0 829.2 825.2 824.2 825.6 830.5 831.7 831.4 830.5 832.3 DAY 15 17 23 5 19 7 28 31 19 25 22 25 MIN. QFE PRESSURE IN HPA 818.8 814.3 813.6 818.2 819.6 818.0 815.8 815.5 817.1 821.0 820.5 817.3 813.6 DAY 24 6 27 23 6 24 17 15 10 2 28 23 MEAN QNH PRESSURE IN HPA 1013.8 1010.7 1011.0 1014.0 1012.6 1009.8 1008.0 1009.4 1013.7 1015.5 1017.1 1014.2 1012.5 MAX. QNH PRESSURE IN HPA 1022.5 1020.1 1019.5 1022.2 1018.9 1014.2 1013.0 1014.6 1020.4 1021.8 1021.5 1020.4 1022.5 DAY 15 17 23 5 19 7 28 31 19 25 22 25 MIN. QNH PRESSURE IN HPA 1006.6 1001.3 1000.4 1005.9 1007.5 1005.6 1003.0 1002.7 1004.6 1009.2 1008.6 1004.8 1000.4 DAY 24 6 27 23 6 24 17 15 10 2 28 23 MEAN QFF PRESSURE IN HPA 1017.7 1013.2 1008.9 1007.1 1003.0 995.4 991.0 994.0 1001.7 1009.5 1016.1 1016.9 1006.2 MAX. QFF PRESSURE IN HPA 1028.2 1024.1 1019.7 1017.5 1009.3 1001.7 995.5 1001.5 1009.2 1018.5 1021.7 1025.8 1028.2 DAY 15 18 9 5 19 7 28 31 19 25 7 8 MIN. QFF PRESSURE IN HPA 1009.3 1003.5 993.2 998.2 998.3 988.9 985.8 985.9 991.0 1000.4 1004.4 1002.9 985.8 DAY 5 6 27 15 24 30 17 15 10 2 1 23 PRESSURE AT HOUR 0900 UTC. MEAN QFE PRESSURE IN HPA 823.8 821.8 821.8 824.1 823.0 820.5 818.9 820.0 823.7 825.2 826.7 824.7 822.9 MAX. QFE PRESSURE IN HPA 831.5 829.6 829.2 830.8 828.8 824.7 823.5 824.6 829.7 830.6 830.4 830.0 831.5 DAY 14 17 23 5 19 7 28 31 18 25 22 25 MIN. QFE PRESSURE IN HPA 817.8 814.5 813.5 818.5 818.1 816.9 814.5 814.0 816.1 819.7 817.7 816.3 813.5 DAY 27 6 18 23 6 24 17 15 10 2 28 23 MEAN QNH PRESSURE IN HPA 1012.5 1010.2 1010.1 1012.9 1011.6 1008.6 1006.7 1008.0 1012.4 1014.1 1015.9 1013.6 1011.4 MAX. QNH PRESSURE IN HPA 1021.6 1019.4 1018.9 1020.8 1018.4 1013.6 1012.1 1013.5 1019.5 1020.5 1020.3 1019.8 1021.6 DAY 14 17 23 5 19 7 28 31 18 25 22 25 MIN. QNH PRESSURE IN HPA 1005.4 1001.5 1000.3 1006.2 1005.8 1004.3 1001.5 1000.9 1003.4 1007.7 1005.3 1003.6 1000.3 DAY 27 6 18 23 6 24 17 15 10 2 28 23 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1015.6 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1023.9 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 25 MIN. QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1001.4 ****** DAY ** ** ** ** ** ** ** ** ** ** ** 23 PRESSURE AT HOUR 1200 UTC. MEAN QFE PRESSURE IN HPA 822.9 820.5 820.4 822.8 822.3 819.3 817.4 818.5 822.3 823.7 825.5 823.9 821.6 MAX. QFE PRESSURE IN HPA 831.5 829.0 827.5 829.3 828.0 823.9 822.0 822.6 828.4 829.0 829.1 828.7 831.5 DAY 14 17 23 5 20 6 28 31 18 23 14 25 MIN. QFE PRESSURE IN HPA 816.5 813.2 812.1 817.2 818.6 815.5 812.8 812.4 814.6 818.9 815.1 816.0 812.1 DAY 27 10 18 23 6 30 17 14 9 13 28 23 MEAN QNH PRESSURE IN HPA 1011.5 1008.6 1008.5 1011.4 1010.7 1007.1 1005.0 1006.2 1010.8 1012.4 1014.5 1012.6 1009.9 MAX. QNH PRESSURE IN HPA 1021.6 1018.7 1016.9 1019.0 1017.5 1012.6 1010.4 1011.1 1017.9 1018.7 1018.8 1018.3 1021.6 DAY 14 17 23 5 20 6 28 31 18 23 14 25 MIN. QNH PRESSURE IN HPA 1003.9 1000.0 998.7 1004.7 1006.4 1002.7 999.5 999.0 1001.6 1006.7 1002.2 1003.3 998.7 DAY 27 10 18 23 6 30 17 14 9 13 28 23 MEAN QFF PRESSURE IN HPA ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** ****** 1014.2 ****** MAX. QFF PRESSURE IN HPA ****** ****** ****** ****