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