BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, DECEMBER 11, 2005 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Broken altocumulus Temperature: 29F, Dew point: 25F, Wind: S at 14 kt Sea-level pressure: 29.59 inches Hg, falling Visibility: 8 miles BHO SA 1155 100 BKN 8 021/29/25/1914/959/ HAZY/ 8/070 4/008 56016 10032 20029 10 A.M. Weather: Scattered altocumulus Temperature: 33F, Dew point: 25F, Wind: SW at 10 kt Sea-level pressure: 29.59 inches Hg, steady Visibility: 11 miles BHO SA 1455 100 SCT 11 021/33/25/2210/959/ CLR E HAZY/ 8/070 58000 WEATHER SUMMARY FOR SATURDAY, DECEMBER 10 TEMPERATURE (DEGREES F) MAX.....34 NORMAL.....40 ASOS.....33 AT 4:36 P.M. MIN.....21 NORMAL.....25 ASOS.....22 AT 7:56 A.M. MEAN....28 NORMAL.....33 DEPARTURE FROM 30-YEAR NORMAL.......-5 TOTAL DEPARTURE FOR THE MONTH......-59 (-6.1 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........37 DEPARTURE.....+5 TOTAL HEATING UNITS FOR THE MONTH.........365 DEPARTURE....+63 TOTAL HEATING UNITS FOR THE SEASON.......1430 DEPARTURE...-164 TOTAL HEATING UNITS LAST SEASON TO DATE..1481 DIFFERENCE...-51 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.........30 S AT 5:52 P.M. AEROVANE..........35 WNW AT 4:23 A.M. ASOS..............29 S AT 5:53 P.M. DAVIS.............32 S FASTEST MILE FOR YESTERDAY...........29 WNW AT 4:27 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE........24 W AT 4:26 A.M. AVERAGE WIND SPEED AND DIRECTION...16.7 S ASOS............16.6 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.47 DEPARTURE....-0.03 ASOS..............1.33 TOTAL PRECIPITATION FOR THE YEAR..........63.74 DEPARTURE...+15.73 ASOS.............62.48* *EXCLUDES 3.19 INCHES OF ERRONEOUS PRECIPITATION RECORDED FROM 1/23-1/28. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.... -0.3 TOTAL SNOWFALL FOR THE MONTH...............13.1 DEPARTURE....+10.5 TOTAL SNOWFALL FOR THE SEASON..............15.2 DEPARTURE.....+9.7 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2005......CALENDAR DAY DATA DATA REPORTED: DATE MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 12/1 43/35/39/+3/0/0/212/38 29 MPH N 12/2 41/31/36/0/0/0/217/39 46 MPH WSW Aero 51 MPH WSW 12/3 33/26/30/-5/0/0/534/96 46 MPH W Aero 50 MPH W 12/4 28/22/25/-10/0.24/2.2/000/00 22 MPH W 12/5 32/21/27/-8/0/0/.../.. 23 MPH WSW 12/6 33/23/28/-6/T/0.1/.../.. 31 MPH W Aero 36 MPH W 12/7 28/16/22/-12/T/T/479/87 44 MPH WNW Aero 50 MPH WNW 12/8 31/14/23/-10/0/0/.../.. 25 MPH NW 12/9 32/22/27/-6/1.23/10.8/.../.. 53 MPH NW Aero 63 MPH NW 12/10 34/21/28/-5/0/0/.../.. 30 MPH S DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 11 HIGH 63 IN 1911 LOW -1 IN 1988 PRECIP 2.36 INCHES IN 1992 SNOWFALL 6.0 INCHES IN 1894 PEAK GUST 78 MPH S IN 1969 RECORDS FOR DECEMBER 12 HIGH 67 IN 1979 LOW -3 IN 1988 PRECIP 3.94 INCHES IN 1992 SNOWFALL 20.3 INCHES IN 1960 PEAK GUST 74 MPH W IN 2000 TODAY'S REPORT BY: Andrew Hoell