BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, DECEMBER 31, 2005 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Mostly cloudy with altocumulus and cirrus Temperature: 20F, Dew point: 14F, Wind: NNW 6 mph Sea-level pressure: 29.91 inches, rising Visibility: 40 miles BHO SA 1155 120 SCT 150 –BKN 250 –OVC 40 130/20/14/3405/991/ THN K LYR ABV HRZN SE-NW WND LGT/ 8/071 51003 10025 20020 10 A.M. Weather: Overcast with altocumulus and altostratus Temperature: 24F, Dew point: 15F, Wind: NNW 6 mph Sea-level pressure: 29.95 inches, rising Visibility: 50 miles BHO SA 1455 65 SCT E100 OVC 50 144/24/15/3405/995/ HIR CLDS VSBL DSNT N-SE LOOMING OF MTNS WNW-NW WND LGT/ 8/071 50014 1 P.M. Weather: Overcast with stratocumulus and altostratus Temperature: 28F, Dew point: 20F, Wind: NE 5 mph Sea-level pressure: 29.87 inches, falling Visibility: 35 miles BHO SA 1755 E50 BKN 100 OVC 35 117/28/20/0404/987/ HIR CLDS VSBL DSNT SE-SW SUN OCNLY DMLY VSBL WND LGT AND VRB/ 8/57/ 58027 10028 20020 WEATHER SUMMARY FOR FRIDAY, DECEMBER 30 TEMPERATURE (DEGREES F) MAX.....49 NORMAL.....35 ASOS.....49 AT 12:48 AM MIN.....25 NORMAL.....20 ASOS.....MIDNIGHT PM MEAN....37 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL.......+9 TOTAL DEPARTURE FOR THE MONTH......-37 (-1.4 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........28 DEPARTURE.....-9 TOTAL HEATING UNITS FOR THE MONTH........1047 DEPARTURE....+44 TOTAL HEATING UNITS FOR THE SEASON.......2112 DEPARTURE...-180 TOTAL HEATING UNITS LAST SEASON TO DATE..2190 DIFFERENCE...-78 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.........39 WNW AT 12:52 P.M.* AEROVANE..........45 WNW AT 12:47 P.M.* ASOS..............39 WNW AT 11:29 A.M. DAVIS.............39 WNW AT 11:28 A.M. FASTEST MILE FOR YESTERDAY...........32 WNW AT 11:29 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE........30 WNW AT 2:10 P.M. AVERAGE WIND SPEED AND DIRECTION...16.5 WNW ASOS............16.0 *LAST OF SEVERAL OCCURRENCES 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..........3.85 DEPARTURE....-0.56 ASOS..............3.84 TOTAL PRECIPITATION FOR THE YEAR..........66.12 DEPARTURE...+15.20 ASOS.............64.99* *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.....-0.4 TOTAL SNOWFALL FOR THE MONTH...............13.1 DEPARTURE.....+2.9 TOTAL SNOWFALL FOR THE SEASON..............15.2 DEPARTURE.....+2.1 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/-8/0/0/061/11 23 MPH WSW 12/6 33/23/28/-6/T/0.1/160/29 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/-10/0/0/545/99 25 MPH NW 12/9 32/22/27/-6/1.23/10.8/000/00 53 MPH NW Aero 63 MPH NW TSTM/SLEET/GLAZE 12/10 34/21/28/-5/0/0/367/67 30 MPH S 12/11 40/27/34/+2/0/0/493/90 27 MPH SSW 12/12 38/21/30/-2/0/0/241/44 25 MPH W 12/13 21/09/15/-17/T/T/361/66 32 MPH WNW Aero 35 MPH WNW 12/14 23/04/14/-17/0/0/513/94 24 MPH NW 12/15 32/07/20/-11/0/0/464/85 21 MPH E 12/16 48/27/38/+7/0.88/T/000/00 55 MPH ESE Aero 61 MPH ESE/SLEET/GLAZE 12/17 37/26/32/+1/0/0/469 86 25 MPH W 12/18 33/23/28/-2/0/0/213/39 21 MPH W 12/19 31/21/26/-4/T/T/164/30 32 MPH WSW Aero 35 MPH WSW 12/20 31/17/24/-6/0/0/533/98 27 MPH WSW 12/21 28/15/22/-8/0/0/501/92 24 MPH WSW 12/22 30/18/24/-5/0/0/419/77 28 MPH SSW 12/23 43/29/36/7/0/0/452/83 28 MPH SSW 12/24 48/35/42/13/0/0/485/89 25 MPH WSW 12/25 49/36/43/14/0.30/0/300/55 31 MPH E 12/26 54/30/42/14/0.76/0.1/0/0 37 MPH W 12/27 38/26/32/4/T/T/469/86 44 MPH WNW 12/28 40/25/33/5/0/0/240/44 30 MPH SE 12/29 52/40/46/18/../0/0/0 35 MPH SE 12/30 49/25/37/9/../0/.../.. 39 MPH WNW 12/31 ..overnight low 20 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 31 HIGH 62F IN 1965 LOW -12F IN 1917 PRECIP 0.96 INS. IN 1906 SNOWFALL 6.0 INS. IN 1886 PEAK GUST 78 MPH NW IN 1990 RECORDS FOR JANUARY 1 HIGH 58F IN 1966 LOW -6F IN 1918 PRECIP 1.45 INS. IN 1982 SNOWFALL 7.2 INS. IN 1938 PEAK GUST 90e MPH S IN 1945 TODAY’S REPORT BY: Mike Iacono