Station Name: TEHRAN MEHRABAD WMO Station Number: 40754 National I.D. Number: Country: IRAN, ISLAMIC REPUBLIC OF WMO Region: REGION II - ASIA Latitude: 35d 42m N Longitude: 051d 21m E Elevation: 1191 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: 1961 1961 1961 1961 1961 eyr: 1990 1990 1990 1990 1990 Statistic: MEAN MEANDLY SD_DLY MNDLYMX MNDLYMI Month -------------------------------------------------- Jan 2.5 3.0 3.06 7.2 -1.1 Feb 4.9 5.3 2.51 9.9 0.7 Mar 10.1 10.3 1.88 15.4 5.2 Apr 16.4 16.4 1.68 21.9 10.9 May 22.2 22.1 1.59 28.0 16.1 Jun 27.9 27.5 1.20 34.1 20.9 Jul 30.8 30.4 1.01 36.8 24.0 Aug 29.5 29.2 1.08 35.4 23.0 Sep 25.4 25.3 1.06 31.5 19.2 Oct 18.2 18.5 1.60 24.0 12.9 Nov 11.1 11.6 1.79 16.5 6.7 Dec 5.0 5.6 2.26 9.8 1.3 Annual 17.0 17.1 1.73 22.5 11.6 Ann-NCDC 17.0 17.1 NA 22.5 11.6 -------------------------------------------------- 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: 1961 1961 eyr: 1990 1990 Statistic: MAX_VAL DATEMAX Month -------------------------- Jan 19.6 198731 Feb 22.0 197319 Mar 28.0 197031 Apr 31.0 197904 May 37.0 197028 Jun 41.0 197029 Jul 43.0 197314 Aug 41.4 199005 Sep 38.0 196704 Oct 33.0 197001 Nov 26.0 197403 Dec 20.0 196905 Annual 43.0 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: 1961 1961 eyr: 1990 1990 Statistic: MIN_VAL DATEMIN Month -------------------------- Jan -15.0 196908 Feb -11.0 197211 Mar -8.0 197602 Apr -3.0 196702 May 4.4 198402 Jun 5.0 196706 Jul 14.0 196813 Aug 13.0 197730 Sep 10.0 196912 Oct 2.8 198727 Nov -6.0 196429 Dec -13.0 196326 Annual -15.0 NA Ann-NCDC NA NA -------------------------- Element 05: Dew Point Temperature (deg C) MEAN (Statistic 01): Mean Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan -4.1 Feb -3.7 Mar -2.0 Apr 0.7 May 3.1 Jun 3.9 Jul 6.5 Aug 5.6 Sep 2.6 Oct 1.3 Nov -0.9 Dec -2.6 Annual 0.9 Ann-NCDC .9 ------------------ Element 06: Precipitation (mm) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 37.2 Feb 34.0 Mar 37.4 Apr 27.8 May 15.2 Jun 2.9 Jul 2.5 Aug 1.4 Sep 0.9 Oct 13.7 Nov 20.6 Dec 36.3 Annual 229.9 Ann-NCDC 229.9 ------------------ 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: 1961 1961 eyr: 1990 1990 Statistic: MAX_VAL DATEMAX Month -------------------------- Jan 34.0 196923 Feb 48.0 196207 Mar 35.0 197927 Apr 35.2 196221 May 26.0 198603 Jun 12.0 197606 Jul 13.0 197408 Aug 12.0 196302 Sep 9.3 198315 Oct 38.0 198209 Nov 17.5 198513 Dec 33.0 197201 Annual 48.0 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: 1961 1961 1961 eyr: 1990 1990 1990 Statistic: MEAN MNDLYMX MNDLYMI Month ---------------------------------- Jan 65.0 79.0 48.0 Feb 57.0 75.0 40.0 Mar 47.0 67.0 31.0 Apr 39.0 58.0 24.0 May 33.0 49.0 20.0 Jun 24.0 38.0 14.0 Jul 24.0 36.0 15.0 Aug 24.0 36.0 16.0 Sep 25.0 37.0 17.0 Oct 36.0 49.0 24.0 Nov 47.0 62.0 32.0 Dec 61.0 76.0 44.0 Annual 40.0 55.0 27.0 Ann-NCDC 40.2 55.2 27.1 ---------------------------------- Element 12: Sea Level Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 1021.6 Feb 1018.5 Mar 1014.0 Apr 1009.9 May 1007.2 Jun 1001.2 Jul 998.5 Aug 1001.1 Sep 1007.2 Oct 1014.7 Nov 1019.3 Dec 1021.0 Annual 1011.2 Ann-NCDC 1011.2 ------------------ Element 13: Station Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 883.5 Feb 881.9 Mar 880.4 Apr 879.6 May 879.6 Jun 876.6 Jul 875.5 Aug 877.2 Sep 880.9 Oct 884.5 Nov 885.6 Dec 884.3 Annual 880.8 Ann-NCDC 880.8 ------------------ Element 14: Vapor Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 4.69 Feb 4.84 Mar 5.57 Apr 6.76 May 8.01 Jun 8.42 Jul 10.00 Aug 9.53 Sep 7.69 Oct 7.04 Nov 6.06 Dec 5.24 Annual 6.99 Ann-NCDC 7.0 ------------------ Element 15: Sunshine MN_#HRS (Statistic 44): Mean Number of Hours ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 168.8 Feb 179.8 Mar 203.0 Apr 220.6 May 287.0 Jun 346.3 Jul 345.9 Aug 333.6 Sep 302.8 Oct 249.9 Nov 202.9 Dec 168.9 Annual 3009.5 Ann-NCDC 3009.5 ------------------ Element 16: Wind Speed (m/sec) MEAN (Statistic 01): Mean Value MAXGUST (Statistic 30): Maximum Gust VECTOR (Statistic 42): Vector ---------------------------------- byr: 1961 1961 1961 eyr: 1990 1990 1990 Statistic: MEAN MAXGUST VECTOR Month ---------------------------------- Jan 3.5 33.0 .9 Feb 5.0 36.0 1.4 Mar 6.4 39.0 1.8 Apr 7.1 45.0 2.0 May 7.2 45.0 1.9 Jun 6.7 39.0 1.4 Jul 5.5 39.0 .7 Aug 4.9 31.0 .7 Sep 4.7 29.0 .6 Oct 4.7 35.0 1.0 Nov 3.9 39.0 .9 Dec 3.5 30.0 .9 Annual 5.3 45.0 1.1 Ann-NCDC 5.3 NA NA ---------------------------------- Element 17: Wind Direction (degrees) MAXGUST (Statistic 30): Maximum Gust PREVAIL (Statistic 41): Prevailing VECTOR (Statistic 42): Vector ---------------------------------- byr: 1961 1961 1961 eyr: 1990 1990 1990 Statistic: MAXGUST PREVAIL VECTOR Month ---------------------------------- Jan 260.0 270.0 284.0 Feb 270.0 270.0 281.0 Mar 330.0 270.0 278.0 Apr 290.0 270.0 277.0 May 290.0 270.0 273.0 Jun 260.0 270.0 256.0 Jul 330.0 135.0 206.0 Aug 270.0 135.0 192.0 Sep 270.0 360.0 246.0 Oct 320.0 270.0 279.0 Nov 270.0 360.0 286.0 Dec 270.0 270.0 284.0 Annual 290.0 270.0 269.0 Ann-NCDC NA NA NA ---------------------------------- Element 17: Wind Direction (degrees) Qualifier: 41: Prevailing MEAN% (Statistic 57): Mean Percent ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 16.6 Feb 21.8 Mar 26.5 Apr 27.3 May 26.2 Jun 23.6 Jul 15.9 Aug 16.8 Sep 14.6 Oct 15.4 Nov 15.3 Dec 14.9 Annual 18.7 Ann-NCDC NA ------------------ Element 18: Wind Steadiness (unitless) MEAN% (Statistic 57): Mean Percent ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 51.4 Feb 56.0 Mar 54.7 Apr 54.9 May 50.0 Jun 40.3 Jul 25.5 Aug 26.5 Sep 25.5 Oct 42.6 Nov 43.6 Dec 48.6 Annual 39.6 Ann-NCDC NA ------------------ Element 48: Calm Winds MEAN% (Statistic 57): Mean Percent ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 45.8 Feb 35.2 Mar 26.4 Apr 21.4 May 20.2 Jun 18.9 Jul 21.9 Aug 25.0 Sep 28.0 Oct 32.1 Nov 41.7 Dec 46.3 Annual 30.2 Ann-NCDC NA ------------------ Element 51: Number Days with Thunder (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 0.1 Feb 0.2 Mar 1.3 Apr 3.8 May 4.6 Jun 2.3 Jul 1.2 Aug 0.9 Sep 0.7 Oct 1.7 Nov 0.4 Dec 0.3 Annual 17.5 Ann-NCDC 17.5 ------------------ Element 56: Number Days with Snowfall (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 5.7 Feb 3.1 Mar 1.2 Apr 0.2 May 0.0 Jun 0.0 Jul 0.0 Aug 0.0 Sep 0.0 Oct 0.0 Nov 0.2 Dec 2.8 Annual 13.2 Ann-NCDC 13.2 ------------------ Element 62: Number Days with Dust (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 1.2 Feb 0.8 Mar 1.9 Apr 3.1 May 3.5 Jun 4.9 Jul 4.9 Aug 3.0 Sep 2.9 Oct 2.3 Nov 0.8 Dec 0.8 Annual 30.1 Ann-NCDC 30.1 ------------------ Element 85: Number Days Minimum Temperature LE Threshold (count) Qualifier: 0.0 deg C MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 19.5 Feb 13.3 Mar 4.0 Apr 0.3 May 0.0 Jun 0.0 Jul 0.0 Aug 0.0 Sep 0.0 Oct 0.0 Nov 1.8 Dec 12.6 Annual 51.5 Ann-NCDC 51.5 ------------------ 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: 1961 1961 1961 eyr: 1990 1990 1990 Qualifier: 1.0 5.0 10.0 Month ---------------------------------- Jan 6.4 2.7 1.0 Feb 5.1 2.5 1.1 Mar 6.3 2.6 1.2 Apr 5.4 1.9 0.7 May 3.8 0.9 0.3 Jun 0.9 0.2 0.0 Jul 0.5 0.2 0.0 Aug 0.4 0.1 0.0 Sep 0.3 0.0 0.0 Oct 2.6 0.7 0.4 Nov 3.4 1.6 0.8 Dec 6.0 2.6 1.2 Annual 41.1 16.0 6.7 Ann-NCDC 41.1 16.0 6.7 ---------------------------------- Element BT: Number Days with Occurrence of Rain (count) Statistic 15: Mean Monthly Value Qualifier: ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 9.9 Feb 8.9 Mar 11.4 Apr 11.0 May 9.4 Jun 3.0 Jul 1.9 Aug 1.5 Sep 1.1 Oct 5.8 Nov 6.6 Dec 8.8 Annual 79.3 Ann-NCDC 79.3 ------------------