Station Name: MILTON/BLUE HILL OBSERVATORY MA WMO Station Number: 74492 National I.D. Number: 00190736 Country: UNITED STATES OF AMERICA WMO Region: REGION IV - NORTH & CENTRAL AMERICA Latitude: 42d 13m N Longitude: 071d 07m W Elevation: 195 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 #_YEARS (Statistic 98): Number of Years used to Calculate Normal -------------------------- byr: 1961 1961 eyr: 1990 1990 Statistic: MEAN #_YEARS Month -------------------------- Jan -3.7 30 Feb -2.6 30 Mar 2.1 30 Apr 7.7 30 May 13.7 30 Jun 18.5 30 Jul 21.8 30 Aug 20.9 30 Sep 16.6 30 Oct 11.1 30 Nov 5.4 30 Dec -1.1 30 Annual 9.2 30 Ann-NCDC 9.2 NA -------------------------- Element 02: Maximum Dry Bulb Temperature (deg C) MEAN (Statistic 01): Mean Value MAX_VAL (Statistic 04): Maximum Value DATEMAX (Statistic 12): Date (Year/Day) of Occurrence of Maximum Daily Value #_YEARS (Statistic 98): Number of Years used to Calculate Normal ------------------------------------------ byr: 1961 1962 1962 1961 eyr: 1990 1990 1990 1990 Statistic: MEAN MAX_VAL DATEMAX #_YEARS Month ------------------------------------------ Jan .6 17.2 197427 30 Feb 1.8 20.0 198524 30 Mar 6.7 28.3 197730 30 Apr 12.9 34.4 197619 30 May 19.2 33.3 198731 30 Jun 23.9 34.4 198815 30 Jul 27.0 37.8 197721 30 Aug 25.8 38.3 197502 30 Sep 21.5 33.9 198311 30 Oct 15.9 31.1 196307 30 Nov 9.6 25.6 198202 30 Dec 3.0 22.2 198429 30 Annual 14.0 NA NA 30 Ann-NCDC 14.0 NA NA NA ------------------------------------------ Element 03: Minimum Dry Bulb Temperature (deg C) MEAN (Statistic 01): Mean Value MIN_VAL (Statistic 05): Minimum Value DATEMIN (Statistic 14): Date (Year/Day) of Occurrence of Minimum Daily Value #_YEARS (Statistic 98): Number of Years used to Calculate Normal ------------------------------------------ byr: 1961 1962 1962 1961 eyr: 1990 1990 1990 1990 Statistic: MEAN MIN_VAL DATEMIN #_YEARS Month ------------------------------------------ Jan -8.0 -23.3 198218 30 Feb -7.1 -23.3 196713 30 Mar -2.5 -18.9 196719 30 Apr 2.6 -10.6 198207 30 May 8.1 -1.7 197801 30 Jun 13.1 3.9 198603 30 Jul 16.5 6.7 198801 30 Aug 15.8 3.9 196530 30 Sep 11.7 .6 196324 30 Oct 6.2 -5.6 197627 30 Nov 1.3 -11.7 198924 30 Dec -5.2 -24.4 198026 30 Annual 4.4 NA NA 30 Ann-NCDC 4.4 NA NA NA ------------------------------------------ Element 06: Precipitation (mm) MEANMLY (Statistic 15): Mean Monthly Value MIN_MLY (Statistic 20): Minimum Monthly Value QUIN20% (Statistic 22): First Quintile QUIN40% (Statistic 23): Second Quintile QUIN60% (Statistic 24): Third Quintile QUIN80% (Statistic 25): Fourth Quintile MAX_MLY (Statistic 26): Maximum Monthly Value #_YEARS (Statistic 98): Number of Years used to Calculate Normal -------------------------------------------------------------------------- byr: 1961 1961 1961 1961 1961 1961 1961 1961 eyr: 1990 1990 1990 1990 1990 1990 1990 1990 Statistic: MEANMLY MIN_MLY QUIN20% QUIN40% QUIN60% QUIN80% MAX_MLY #_YEARS Month -------------------------------------------------------------------------- Jan 105.4 24.6 49.3 77.0 108.2 153.7 294.9 30 Feb 109.5 18.0 62.2 87.4 114.0 151.4 236.7 30 Mar 112.0 16.0 59.9 87.1 116.3 157.7 278.4 30 Apr 102.9 35.1 59.2 82.6 107.4 141.7 263.4 30 May 96.5 15.7 52.8 75.9 100.3 135.1 232.2 30 Jun 87.1 23.1 35.8 59.7 87.9 130.6 348.7 30 Jul 88.6 18.3 42.7 65.8 91.2 128.5 270.8 30 Aug 99.6 13.5 45.7 71.9 101.9 145.8 226.6 30 Sep 97.0 17.5 45.2 70.9 99.6 141.5 254.0 30 Oct 100.1 33.3 59.2 81.5 104.6 136.9 275.3 30 Nov 125.0 14.0 62.0 94.0 129.0 179.6 248.4 30 Dec 119.6 29.0 57.9 88.9 123.2 173.2 320.0 30 Annual 1243.3 NA NA NA NA NA NA 30 Ann-NCDC 1243.3 NA NA NA NA NA NA NA -------------------------------------------------------------------------- Element 08: Maximum 24-Hour Precipitation (mm) MAX_DLY (Statistic 11): Maximum Daily Value DATEMAX (Statistic 12): Date (Year/Day) of Occurrence of Maximum Daily Value #_YEARS (Statistic 98): Number of Years used to Calculate Normal ---------------------------------- byr: 1962 1962 1962 eyr: 1990 1990 1990 Statistic: MAX_DLY DATEMAX #_YEARS Month ---------------------------------- Jan 63.2 197921 28 Feb 78.7 196924 28 Mar 142.5 196818 28 Apr 56.6 198324 28 May 127.5 198431 28 Jun 80.0 198606 28 Jul 101.9 197927 28 Aug 79.5 199011 28 Sep 97.0 197203 28 Oct 96.0 196206 29 Nov 78.7 198325 29 Dec 92.5 196926 29 Annual NA NA NA Ann-NCDC NA NA NA ---------------------------------- Element 09: Snowfall (cm) MEDIAN (Statistic 02): Median Value MAX_DLY (Statistic 11): Maximum Daily Value DATEMAX (Statistic 12): Date (Year/Day) of Occurrence of Maximum Daily Value MEANMLY (Statistic 15): Mean Monthly Value QUAR25% (Statistic 58): First Quartile QUAR75% (Statistic 59): Third Quartile #_YEARS (Statistic 98): Number of Years used to Calculate Normal ------------------------------------------------------------------ byr: 1962 1962 1962 1962 1962 1962 1962 eyr: 1990 1990 1990 1990 1990 1990 1990 Statistic: MEDIAN MAX_DLY DATEMAX MEANMLY QUAR25% QUAR75% #_YEARS Month ------------------------------------------------------------------ Jan 32.5 48.3 197820 39.4 15.5 55.4 28 Feb 26.7 69.6 196924 40.6 16.0 56.6 28 Mar 22.6 34.3 198429 26.9 11.2 33.5 28 Apr .3 31.2 198206 6.3 Trace 10.4 28 May .0 12.7 197709 .8 .0 .0 28 Jun .0 .0 199030 .0 .0 .0 28 Jul .0 .0 199031 .0 .0 .0 28 Aug .0 .0 199031 .0 .0 .0 28 Sep .0 .0 199030 .0 .0 .0 28 Oct .0 17.3 197910 1.0 .0 Trace 29 Nov 1.0 27.9 198619 7.4 .0 13.7 29 Dec 21.3 33.3 197629 29.7 15.5 46.7 29 Annual NA NA NA 152.1 NA NA NA Ann-NCDC NA NA NA 152.1 NA NA NA ------------------------------------------------------------------ Element 15: Sunshine %OFPOSS (Statistic 37): Percent of Possible MN_#HRS (Statistic 44): Mean Number of Hours -------------------------- byr: 1961 1961 eyr: 1990 1990 Statistic: %OFPOSS MN_#HRS Month -------------------------- Jan 50.0 148.3 Feb 51.0 151.6 Mar 49.0 181.3 Apr 49.0 196.5 May 52.0 235.1 Jun 55.0 253.0 Jul 58.0 266.8 Aug 58.0 250.0 Sep 57.0 214.9 Oct 56.0 193.4 Nov 46.0 135.9 Dec 46.0 131.7 Annual 53.0 2358.5 Ann-NCDC NA 2358.5 -------------------------- Element 15: Sunshine Qualifier: 15: Mean Monthly Value #_YEARS (Statistic 98): Number of Years used to Calculate Normal ------------------ byr: 1961 eyr: 1990 Month ------------------ Jan 30 Feb 30 Mar 30 Apr 30 May 29 Jun 30 Jul 30 Aug 30 Sep 30 Oct 30 Nov 30 Dec 30 Annual 0 Ann-NCDC NA ------------------ Element 83: Number Days Maximum Temperature GE Threshold (count) Statistic 15: Mean Monthly Value Qualifier: 10.0 deg C Qualifier: 35.0 deg C -------------------------- byr: 1962 1962 eyr: 1990 1990 Qualifier: 10.0 35.0 Month -------------------------- Jan 2.2 .0 Feb 2.6 .0 Mar 8.4 .0 Apr 20.5 .0 May 29.4 .0 Jun 30.0 .0 Jul 31.0 .6 Aug 31.0 .1 Sep 30.0 .0 Oct 27.3 .0 Nov 13.9 .0 Dec 4.6 .0 Annual 230.9 .7 Ann-NCDC 230.9 0.7 -------------------------- Element 85: Number Days Minimum Temperature LE Threshold (count) Statistic 15: Mean Monthly Value Qualifier: 0.0 deg C Qualifier: 10.0 deg C -------------------------- byr: 1962 1962 eyr: 1990 1990 Qualifier: 0.0 10.0 Month -------------------------- Jan 28.8 31.0 Feb 25.7 28.0 Mar 22.3 30.9 Apr 7.8 29.0 May .3 23.1 Jun .0 6.5 Jul .0 .3 Aug .0 1.5 Sep .0 11.2 Oct 3.4 24.7 Nov 13.4 28.8 Dec 26.3 30.8 Annual 128.0 245.8 Ann-NCDC 128.0 245.8 -------------------------- Element 95: Number Days with Precipitation GE Threshold (count) Statistic 15: Mean Monthly Value Qualifier: 1.0 mm ------------------ byr: 1962 eyr: 1990 Month ------------------ Jan 9.6 Feb 8.0 Mar 9.6 Apr 8.9 May 9.5 Jun 9.0 Jul 7.0 Aug 8.3 Sep 7.3 Oct 7.3 Nov 9.4 Dec 9.8 Annual 103.7 Ann-NCDC 103.7 ------------------