BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, DECEMBER 23, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Obscured Temperature: 37F, Dew point: 37F, Wind: ESE 15G20 kt Sea-level pressure: 30.41 inches Hg, falling Visibility: 1/8 of a mile in fog 6-hour min temp: 34F Snow on ground: 14 inches BHO SA 1155 W2 X1 1/8F 298/37/37/1115G20/041/ 8//// 58014 10037 20034 10 A.M. Weather: Overcast Temperature: 40F, Dew point: 38F, Wind: ESE at 16G21 kt Sea-level pressure: 30.33 inches Hg, falling Visibility: 8 miles in fog BHO SA 1455 75 OVC 8F 270/40/38/1116G21/033/ K LYR ALNG HRZN W-NW GF SW/ 8/4// 58018 WEATHER SUMMARY FOR SATURDAY, DECEMBER 22 TEMPERATURE (DEGREES F) MAX.....35 NORMAL.....37 MIN.....23 NORMAL.....22 MEAN....29 NORMAL.....29 DEPARTURE FROM 30-YEAR NORMAL............0 TOTAL DEPARTURE FOR THE MONTH.........-119 [-5.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............36 DEPARTURE.......+1 TOTAL HEATING UNITS FOR THE MONTH...........836 DEPARTURE.....+125 TOTAL HEATING UNITS FOR THE SEASON.........1916 DEPARTURE......-84 TOTAL HEATING UNITS LAST SEASON TO DATE....1611 DIFFERENCE....+305 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............21 ESE AT 10:55 P.M. AEROVANE.............20 ESE AT 10:55 P.M. ASOS.................N/A * DAVIS................19 ESE AT 10:42 P.M. FASTEST MILE FOR YESTERDAY............. 16 ESE AT 10:53 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........N/A * MAXIMUM 2-MINUTE DAVIS AVERAGE..........15 ESE AT 11:49 P.M. AVERAGE WIND SPEED AND DIRECTION.......8.1 NNW ASOS................N/A * DAVIS...............6.9 NNE [14 deg] * ASOS WIND SYSTEM MALFUNCTIONED ON DEC 19. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE DEPARTURE....-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........4.69 DEPARTURE....+1.48 ASOS..............4.74 TOTAL PRECIPITATION FOR THE YEAR..........43.53 DEPARTURE....-6.34 ASOS.............42.96 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M........trace DEPARTURE.....-0.4 TOTAL SNOWFALL FOR THE MONTH...............28.2 DEPARTURE....+21.1 TOTAL SNOWFALL FOR THE SEASON..............29.0 DEPARTURE....+19.0 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2007...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 33/15/24/-12/0/0/493/88 54 WNW 12/2 24/15/20/-16/0.03/0.3/000/00 28 WNW 12/3 38/23/31/-4/0.62/1.7/000/00 47 W 12/4 27/17/22/-13/T/T/111/20 48 W 12/5 29/17/23/-12/T/T/244/44 23 WNW 12/6 28/15/22/-12/0/0/554/100 31 WNW 12/7 34/21/28/-6/0.07/0.7/000/00 24 SSW 12/8 41/25/33/0/0/0/452/82 32 W 12/9 33/25/29/-4/0.08/T/000/00 16 NW 12/10 30/26/28/-5/0.10/0/000/00 18 N 12/11 36/22/29/-3/0.09/0/258/47 25 S 12/12 44/22/36/+4/T/0/88/16 39 W 12/13 29/20/25/-7/1.08/9.2/000/00 24 ENE 12/14 37/20/29/-2/0.02/0.2/038/07 28 WSW 12/15 28/15/22/-9/0/0/.../.. 31 WNW 12/16 43/23/33/+2/1.62/8.5/000/00 54 NE 12/17 32/15/24/-7/0/0/.../.. 62 W 12/18 31/10/21/-9/0/0/.../.. 20 W 12/19 38/24/31/+1/.../.../.../.. 19 E 12/20 33/26/30/0/.../../000/00 24 NNW 12/21 28/22/25/-5/.../../000/00 25 N 12/22 32/26/29/0/../../.../.. 21 ESE NEW DAILY RECORDS FOR DECEMBER 2007: Dec 13: Record daily snowfall of 9.2 inches surpasses previous record of 9.0 inches in 1902. Dec.16: Record daily snowfall of 8.5 inches surpasses previous record of 7.0 inches in 1896. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 23 HIGH 62 IN 1990 LOW -1 IN 1989 PRECIP 1.70 INCHES IN 1947 SNOWFALL 11.9 INCHES IN 1947 PEAK GUST 67 SSE IN 2004 RECORDS FOR DECEMBER 24 HIGH 58 IN 1996 LOW -6 IN 1943 PRECIP 2.21 INCHES IN 1994 SNOWFALL 12.3 INCHES IN 1961 PEAK GUST 79e MPH SE IN 1941 TODAY'S REPORT PREPARED By: Andrew Hoell