Station Name: ARAK WMO Station Number: 40769 National I.D. Number: Country: IRAN, ISLAMIC REPUBLIC OF WMO Region: REGION II - ASIA Latitude: 34d 06m N Longitude: 049d 46m E Elevation: 1708 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 -1.3 -0.7 4.35 4.2 -5.6 Feb 1.0 1.5 4.42 6.8 -3.8 Mar 7.3 7.8 2.21 13.5 2.0 Apr 13.1 13.3 1.52 19.6 7.0 May 18.4 18.3 1.53 25.6 11.0 Jun 24.4 24.0 1.14 32.6 15.3 Jul 27.5 27.3 1.21 35.8 18.8 Aug 26.3 26.2 1.33 34.9 17.5 Sep 21.9 21.9 1.11 30.8 13.0 Oct 15.2 15.4 1.59 23.1 7.8 Nov 8.0 8.7 1.57 14.8 2.6 Dec 2.0 2.7 3.10 7.5 -2.2 Annual 13.6 13.9 2.09 20.8 6.9 Ann-NCDC 13.6 13.9 NA 20.8 7.0 -------------------------------------------------- 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: 1961 1961 eyr: 1990 1990 Statistic: MAX_VAL DATEMAX Month -------------------------- Jan 17.0 196315 Feb 21.0 196626 Mar 25.0 196224 Apr 29.0 197904 May 35.0 197713 Jun 41.0 197530 Jul 44.0 197714 Aug 41.0 197501 Sep 38.0 197607 Oct 31.0 196402 Nov 24.0 196201 Dec 20.0 199004 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: 1961 1961 eyr: 1990 1990 Statistic: MIN_VAL DATEMIN Month -------------------------- Jan -28.0 198328 Feb -30.5 198917 Mar -13.0 197602 Apr -4.0 196702 May 0.0 198402 Jun 4.0 196706 Jul 12.0 196813 Aug 10.0 196929 Sep 2.0 198125 Oct -4.0 198421 Nov -7.0 196125 Dec -23.0 198218 Annual -30.5 NA Ann-NCDC NA NA -------------------------- Element 05: Dew Point Temperature (deg C) MEAN (Statistic 01): Mean Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan -6.1 Feb -5.2 Mar -2.6 Apr 0.1 May 2.7 Jun 3.2 Jul 5.4 Aug 4.3 Sep 0.8 Oct 0.1 Nov -1.1 Dec -4.2 Annual -0.2 Ann-NCDC -.2 ------------------ Element 06: Precipitation (mm) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 54.7 Feb 47.6 Mar 53.1 Apr 53.4 May 31.9 Jun 1.5 Jul 0.6 Aug 1.1 Sep 0.7 Oct 18.5 Nov 31.6 Dec 51.0 Annual 345.7 Ann-NCDC 345.7 ------------------ 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 63.0 196920 Feb 44.0 198025 Mar 48.0 198127 Apr 67.0 196108 May 58.0 198604 Jun 4.4 197606 Jul 3.0 197407 Aug 6.0 197101 Sep 6.0 196529 Oct 45.0 196529 Nov 80.0 197204 Dec 38.0 197405 Annual 80.0 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 72.0 85.0 58.0 Feb 67.0 83.0 51.0 Mar 55.0 74.0 36.0 Apr 46.0 67.0 28.0 May 40.0 61.0 24.0 Jun 28.0 44.0 16.0 Jul 27.0 40.0 17.0 Aug 27.0 41.0 16.0 Sep 27.0 42.0 16.0 Oct 40.0 57.0 25.0 Nov 56.0 73.0 39.0 Dec 67.0 81.0 51.0 Annual 46.0 62.0 31.0 Ann-NCDC 46.0 62.3 31.4 ---------------------------------- Element 12: Sea Level Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 1018.0 Feb 1015.6 Mar 1010.0 Apr 1006.2 May 1003.6 Jun 996.8 Jul 993.2 Aug 995.7 Sep 1002.8 Oct 1010.6 Nov 1015.4 Dec 1017.3 Annual 1007.1 Ann-NCDC 1007.1 ------------------ Element 13: Station Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 825.4 Feb 824.3 Mar 823.7 Apr 824.0 May 824.9 Jun 822.6 Jul 821.2 Aug 822.5 Sep 826.1 Oct 828.8 Nov 828.7 Dec 826.7 Annual 824.9 Ann-NCDC 824.9 ------------------ Element 14: Vapor Pressure (hPa) MEAN (Statistic 01): Mean Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 4.12 Feb 4.38 Mar 5.27 Apr 6.44 May 7.75 Jun 7.94 Jul 9.33 Aug 8.62 Sep 6.76 Oct 6.41 Nov 5.87 Dec 4.67 Annual 6.46 Ann-NCDC 6.5 ------------------ Element 15: Sunshine MN_#HRS (Statistic 44): Mean Number of Hours ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 150.8 Feb 160.6 Mar 196.0 Apr 222.1 May 287.5 Jun 350.4 Jul 338.3 Aug 329.4 Sep 305.1 Oct 262.3 Nov 188.5 Dec 160.8 Annual 2951.8 Ann-NCDC 2951.8 ------------------ 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 1.8 23.2 .7 Feb 2.7 20.1 1.0 Mar 4.3 29.9 1.6 Apr 4.3 26.3 1.6 May 3.5 25.2 1.2 Jun 3.0 18.0 .5 Jul 3.0 20.1 .6 Aug 3.0 18.0 .7 Sep 2.6 18.0 .2 Oct 2.7 22.1 .8 Nov 2.0 16.0 .7 Dec 2.1 20.1 .8 Annual 2.9 29.9 .7 Ann-NCDC 2.9 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 230.0 270.0 255.0 Feb 260.0 270.0 252.0 Mar 270.0 270.0 250.0 Apr 180.0 270.0 252.0 May 290.0 270.0 258.0 Jun 70.0 270.0 266.0 Jul 150.0 45.0 70.0 Aug 60.0 45.0 70.0 Sep 60.0 270.0 274.0 Oct 270.0 270.0 255.0 Nov 190.0 270.0 253.0 Dec 230.0 270.0 249.0 Annual 270.0 270.0 255.0 Ann-NCDC NA NA NA ---------------------------------- Element 17: Wind Direction (degrees) Qualifier: 41: Prevailing MEAN% (Statistic 57): Mean Percent ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 9.7 Feb 12.6 Mar 19.7 Apr 20.0 May 19.0 Jun 13.8 Jul 12.1 Aug 13.0 Sep 9.7 Oct 12.7 Nov 9.3 Dec 10.7 Annual 12.3 Ann-NCDC NA ------------------ Element 18: Wind Steadiness (unitless) MEAN% (Statistic 57): Mean Percent ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 72.2 Feb 70.4 Mar 72.1 Apr 74.4 May 68.6 Jun 33.3 Jul 40.0 Aug 46.7 Sep 15.4 Oct 55.6 Nov 65.0 Dec 76.2 Annual 44.8 Ann-NCDC NA ------------------ Element 48: Calm Winds MEAN% (Statistic 57): Mean Percent ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 79.0 Feb 70.0 Mar 53.7 Apr 53.1 May 58.8 Jun 60.5 Jul 61.8 Aug 61.4 Sep 65.1 Oct 65.8 Nov 75.6 Dec 74.3 Annual 64.9 Ann-NCDC NA ------------------ Element 51: Number Days with Thunder (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 0.2 Feb 0.1 Mar 0.7 Apr 1.8 May 2.7 Jun 0.9 Jul 0.4 Aug 0.3 Sep 0.3 Oct 0.7 Nov 0.2 Dec 0.1 Annual 8.4 Ann-NCDC 8.4 ------------------ Element 56: Number Days with Snowfall (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 7.6 Feb 6.4 Mar 3.2 Apr 0.5 May 0.0 Jun 0.0 Jul 0.0 Aug 0.0 Sep 0.0 Oct 0.1 Nov 0.7 Dec 4.6 Annual 23.1 Ann-NCDC 23.1 ------------------ Element 62: Number Days with Dust (count) MEANMLY (Statistic 15): Mean Monthly Value ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 0.1 Feb 0.1 Mar 1.1 Apr 1.8 May 2.5 Jun 3.4 Jul 3.3 Aug 2.5 Sep 1.5 Oct 1.1 Nov 0.2 Dec 0.0 Annual 17.6 Ann-NCDC 17.6 ------------------ 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 26.4 Feb 21.4 Mar 10.6 Apr 1.0 May 0.0 Jun 0.0 Jul 0.0 Aug 0.0 Sep 0.0 Oct 0.4 Nov 8.0 Dec 22.3 Annual 90.1 Ann-NCDC 90.1 ------------------ 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 8.0 3.6 1.6 Feb 7.2 3.4 1.7 Mar 8.1 3.4 1.7 Apr 7.1 3.2 1.6 May 4.8 1.9 1.1 Jun 0.7 0.0 0.0 Jul 0.3 0.0 0.0 Aug 0.4 0.1 0.0 Sep 0.3 0.0 0.0 Oct 3.1 1.3 0.6 Nov 4.7 2.4 0.9 Dec 6.8 3.5 1.6 Annual 51.5 22.8 10.8 Ann-NCDC 51.5 22.8 10.8 ---------------------------------- Element BT: Number Days with Occurrence of Rain (count) Statistic 15: Mean Monthly Value Qualifier: ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 10.8 Feb 9.8 Mar 11.4 Apr 9.4 May 7.1 Jun 1.1 Jul 0.9 Aug 0.6 Sep 0.6 Oct 4.3 Nov 6.1 Dec 8.9 Annual 71.0 Ann-NCDC 71.0 ------------------