Station Name: SEMNAN WMO Station Number: 40757 National I.D. Number: Country: IRAN, ISLAMIC REPUBLIC OF WMO Region: REGION II - ASIA Latitude: 35d 33m N Longitude: 053d 33m E Elevation: 1171 m In the following tables, byr = beginning year of normals or extremes data period eyr = ending year of normals or extremes data period NA = Not Applicable, data not submitted or not computed * = value > 0 but < units resolution Ann-NCDC = annual value computed by NCDC from monthly values provided by Members ========================================================== The normals data and climate variable descriptions are presented in these tables as provided by the WMO Member country. ========================================================== Element 01: Dry Bulb Temperature (deg C) MEAN (Statistic 01): Mean Value MEANDLY (Statistic 06): Mean Daily Value SD_DLY (Statistic 08): Standard Deviation of Mean Daily Value MNDLYMX (Statistic 09): Mean Daily Maximum Value MNDLYMI (Statistic 10): Mean Daily Minimum Value -------------------------------------------------- byr: 1965 1965 1965 1965 1965 eyr: 1990 1990 1990 1990 1990 Statistic: MEAN MEANDLY SD_DLY MNDLYMX MNDLYMI Month -------------------------------------------------- Jan 3.6 3.7 2.25 8.4 -1.0 Feb 5.9 5.8 2.26 10.9 0.7 Mar 11.5 11.2 1.89 16.8 5.5 Apr 18.4 17.7 1.55 23.9 11.5 May 24.0 23.2 1.59 29.6 16.8 Jun 29.8 28.8 1.25 35.4 22.3 Jul 32.2 31.4 1.00 37.8 24.9 Aug 30.9 30.1 1.39 36.7 23.5 Sep 26.8 26.1 0.98 32.7 19.4 Oct 19.5 19.1 1.60 25.2 13.0 Nov 12.3 12.1 1.65 17.7 6.5 Dec 5.9 6.0 1.83 10.8 1.2 Annual 18.4 17.9 1.60 23.8 12.0 Ann-NCDC 18.4 17.9 NA 23.8 12.0 -------------------------------------------------- Element 02: Maximum Dry Bulb Temperature (deg C) MAX_VAL (Statistic 04): Maximum Value DATEMAX (Statistic 12): Date (Year/Day) of Occurrence of Maximum Daily Value -------------------------- byr: 1965 1965 eyr: 1990 1990 Statistic: MAX_VAL DATEMAX Month -------------------------- Jan 20.0 197106 Feb 22.0 197719 Mar 29.0 197031 Apr 33.0 197904 May 38.0 197027 Jun 43.0 197030 Jul 44.0 197330 Aug 42.4 198316 Sep 40.0 197101 Oct 34.0 196906 Nov 27.0 197008 Dec 20.2 198808 Annual 44.0 NA Ann-NCDC NA NA -------------------------- Element 03: Minimum Dry Bulb Temperature (deg C) MIN_VAL (Statistic 05): Minimum Value DATEMIN (Statistic 14): Date (Year/Day) of Occurrence of Minimum Daily Value -------------------------- byr: 1965 1965 eyr: 1990 1990 Statistic: MIN_VAL DATEMIN Month -------------------------- Jan -11.0 196908 Feb -9.0 197202 Mar -7.0 197603 Apr -2.0 196702 May 5.0 197402 Jun 10.0 196707 Jul 17.0 196814 Aug 15.0 197225 Sep 7.0 196913 Oct 2.0 197724 Nov -3.0 196918 Dec -8.0 196727 Annual -11.0 NA Ann-NCDC NA NA -------------------------- Element 05: Dew Point Temperature (deg C) MEAN (Statistic 01): Mean Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan -3.2 Feb -2.9 Mar -0.2 Apr 2.7 May 6.3 Jun 8.1 Jul 10.3 Aug 10.1 Sep 6.7 Oct 4.4 Nov 0.8 Dec -1.8 Annual 3.4 Ann-NCDC 3.4 ------------------ Element 06: Precipitation (mm) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 22.1 Feb 20.7 Mar 22.7 Apr 13.7 May 14.6 Jun 3.1 Jul 1.9 Aug 3.1 Sep 1.4 Oct 7.6 Nov 9.1 Dec 19.5 Annual 139.5 Ann-NCDC 139.5 ------------------ Element 08: Maximum 24-Hour Precipitation (mm) MAX_VAL (Statistic 04): Maximum Value DATEMAX (Statistic 12): Date (Year/Day) of Occurrence of Maximum Daily Value -------------------------- byr: 1965 1965 eyr: 1990 1990 Statistic: MAX_VAL DATEMAX Month -------------------------- Jan 27.0 196923 Feb 26.0 196823 Mar 33.0 198911 Apr 27.0 196913 May 25.0 197210 Jun 10.0 196803 Jul 9.2 198121 Aug 15.0 198605 Sep 10.4 196912 Oct 14.0 198209 Nov 21.0 198629 Dec 41.0 197201 Annual 41.0 NA Ann-NCDC NA NA -------------------------- Element 11: Relative Humidity (%) MEAN (Statistic 01): Mean Value MNDLYMX (Statistic 09): Mean Daily Maximum Value MNDLYMI (Statistic 10): Mean Daily Minimum Value ---------------------------------- byr: 1965 1965 1965 eyr: 1990 1990 1990 Statistic: MEAN MNDLYMX MNDLYMI Month ---------------------------------- Jan 63.0 77.0 49.0 Feb 56.0 72.0 42.0 Mar 48.0 64.0 35.0 Apr 38.0 54.0 27.0 May 35.0 49.0 25.0 Jun 28.0 38.0 20.0 Jul 28.0 38.0 21.0 Aug 29.0 40.0 22.0 Sep 30.0 40.0 22.0 Oct 39.0 51.0 29.0 Nov 48.0 61.0 37.0 Dec 60.0 74.0 47.0 Annual 41.0 55.0 31.0 Ann-NCDC 41.8 54.8 31.3 ---------------------------------- Element 12: Sea Level Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 1021.8 Feb 1018.2 Mar 1014.9 Apr 1009.9 May 1007.5 Jun 1001.6 Jul 999.7 Aug 1001.9 Sep 1008.2 Oct 1015.1 Nov 1019.6 Dec 1021.9 Annual 1011.7 Ann-NCDC 1011.7 ------------------ Element 13: Station Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 887.2 Feb 885.6 Mar 884.2 Apr 883.1 May 883.1 Jun 880.2 Jul 879.3 Aug 881.0 Sep 884.6 Oct 887.9 Nov 889.0 Dec 887.8 Annual 884.4 Ann-NCDC 884.4 ------------------ Element 14: Vapor Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 4.99 Feb 5.18 Mar 6.36 Apr 7.79 May 9.89 Jun 11.18 Jul 12.87 Aug 12.69 Sep 10.17 Oct 8.63 Nov 6.79 Dec 5.56 Annual 8.51 Ann-NCDC 8.5 ------------------ Element 15: Sunshine MN_#HRS (Statistic 44): Mean Number of Hours ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 170.1 Feb 175.7 Mar 203.0 Apr 218.9 May 279.1 Jun 337.9 Jul 338.7 Aug 334.0 Sep 302.9 Oct 257.7 Nov 206.9 Dec 177.4 Annual 3002.3 Ann-NCDC 3002.3 ------------------ Element 16: Wind Speed (m/sec) MEAN (Statistic 01): Mean Value MAXGUST (Statistic 30): Maximum Gust VECTOR (Statistic 42): Vector ---------------------------------- byr: 1965 1965 1965 eyr: 1990 1990 1990 Statistic: MEAN MAXGUST VECTOR Month ---------------------------------- Jan .4 11.8 .2 Feb .8 15.4 .3 Mar 1.3 15.4 .4 Apr 1.8 16.5 .7 May 1.8 25.7 .5 Jun 1.7 15.4 .3 Jul 1.7 16.0 .7 Aug 1.4 14.4 .4 Sep 1.5 12.9 .3 Oct 1.2 12.9 .4 Nov .7 12.9 .2 Dec .4 12.9 .2 Annual 1.2 25.7 .2 Ann-NCDC 1.2 NA NA ---------------------------------- Element 17: Wind Direction (degrees) MAXGUST (Statistic 30): Maximum Gust PREVAIL (Statistic 41): Prevailing VECTOR (Statistic 42): Vector ---------------------------------- byr: 1965 1965 1965 eyr: 1990 1990 1990 Statistic: MAXGUST PREVAIL VECTOR Month ---------------------------------- Jan 360.0 360.0 308.0 Feb 330.0 360.0 281.0 Mar 270.0 360.0 269.0 Apr 270.0 225.0 250.0 May 270.0 225.0 267.0 Jun 340.0 360.0 14.0 Jul 360.0 45.0 39.0 Aug 20.0 360.0 25.0 Sep 220.0 360.0 310.0 Oct 210.0 360.0 280.0 Nov 210.0 360.0 297.0 Dec 320.0 360.0 309.0 Annual 270.0 360.0 307.0 Ann-NCDC NA NA NA ---------------------------------- Element 17: Wind Direction (degrees) Qualifier: 41: Prevailing MEAN% (Statistic 57): Mean Percent ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 3.6 Feb 5.2 Mar 6.8 Apr 9.1 May 8.8 Jun 9.0 Jul 10.0 Aug 9.0 Sep 10.2 Oct 8.3 Nov 5.8 Dec 3.9 Annual 7.2 Ann-NCDC NA ------------------ Element 18: Wind Steadiness (unitless) MEAN% (Statistic 57): Mean Percent ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 37.5 Feb 31.3 Mar 28.0 Apr 38.2 May 26.5 Jun 15.2 Jul 42.4 Aug 29.6 Sep 17.2 Oct 30.4 Nov 28.6 Dec 37.5 Annual 16.7 Ann-NCDC NA ------------------ Element 48: Calm Winds MEAN% (Statistic 57): Mean Percent ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 88.2 Feb 79.8 Mar 69.6 Apr 61.7 May 62.3 Jun 61.5 Jul 61.2 Aug 65.5 Sep 64.8 Oct 69.6 Nov 80.6 Dec 87.7 Annual 71.0 Ann-NCDC NA ------------------ Element 51: Number Days with Thunder (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 0.0 Feb 0.2 Mar 0.3 Apr 1.0 May 2.2 Jun 0.8 Jul 0.8 Aug 0.7 Sep 0.3 Oct 0.4 Nov 0.0 Dec 0.1 Annual 6.8 Ann-NCDC 6.8 ------------------ Element 56: Number Days with Snowfall (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 3.3 Feb 1.7 Mar 0.7 Apr 0.0 May 0.0 Jun 0.0 Jul 0.0 Aug 0.0 Sep 0.0 Oct 0.0 Nov 0.0 Dec 1.1 Annual 6.8 Ann-NCDC 6.8 ------------------ Element 62: Number Days with Dust (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 0.1 Feb 0.2 Mar 0.8 Apr 0.9 May 1.1 Jun 0.8 Jul 0.0 Aug 0.2 Sep 0.2 Oct 0.3 Nov 0.0 Dec 0.1 Annual 4.7 Ann-NCDC 4.7 ------------------ Element 85: Number Days Minimum Temperature LE Threshold (count) Qualifier: 0.0 deg C MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 20.6 Feb 13.0 Mar 3.0 Apr 0.1 May 0.0 Jun 0.0 Jul 0.0 Aug 0.0 Sep 0.0 Oct 0.0 Nov 1.4 Dec 12.8 Annual 50.9 Ann-NCDC 50.9 ------------------ Element 95: Number Days with Precipitation GE Threshold (count) Statistic 15: Mean Monthly Value Qualifier: 1.0 mm Qualifier: 5.0 mm Qualifier: 10.0 mm ---------------------------------- byr: 1965 1965 1965 eyr: 1990 1990 1990 Qualifier: 1.0 5.0 10.0 Month ---------------------------------- Jan 4.4 1.6 0.6 Feb 3.7 1.7 0.7 Mar 3.9 1.5 0.7 Apr 3.3 0.8 0.3 May 3.3 0.8 0.3 Jun 1.0 0.1 0.0 Jul 0.6 0.1 0.0 Aug 0.5 0.3 0.1 Sep 0.3 0.1 0.0 Oct 1.6 0.7 0.1 Nov 1.9 0.7 0.2 Dec 3.4 1.3 0.7 Annual 27.9 9.7 3.7 Ann-NCDC 27.9 9.7 3.7 ---------------------------------- Element BT: Number Days with Occurrence of Rain (count) Statistic 15: Mean Monthly Value Qualifier: ------------------ byr: 1965 eyr: 1990 Month ------------------ Jan 6.5 Feb 5.2 Mar 7.2 Apr 6.0 May 6.2 Jun 2.4 Jul 1.4 Aug 1.3 Sep 0.8 Oct 3.3 Nov 3.3 Dec 5.1 Annual 48.7 Ann-NCDC 48.7 ------------------