BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, DECEMBER 28, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear Temperature: 32F, Dew point: 31F, Wind: WSW at 14 kts Sea-level pressure: 30.22 inches Hg, rising Visibility: 15 miles, thin fog 6-hour min temp: 31F 24-hour precip: 0.23 inches 24-hour snowfall: trace Snow on ground: trace (patchy snow cover) BHO SA 1155 CLR 15 233/32/31/2414/022/ DRK K LYR N-E-S THN F PTCHS GF ALQDS THN GLZ FROST AND PTCHS BLACK ICE/ 53023 MANUAL 70023 ASOS 70024 10032 20031 10 A.M. Weather: Clear Temperature: 37F, Dew point: 32F, Wind: WSW at 14 kts Sea-level pressure: 30.31 inches Hg, rising Visibility: 15 miles, hazy BHO SA 1455 CLR 15 265/37/32/2514/031/ FEW SC DSNT WNW-NW HZY/ 8/500 51032 1 P.M. Weather: Scattered stratocumulus Temperature: 44F, Dew point: 30F, Wind: W at 8 kts Sea-level pressure: 30.28 inches Hg, falling Visibility: 20 miles, light haze 6-hourly max. temp. 44F BHO SA 1755 35 SCT 20 253/43/30/2708/028/ LGT HZ/ 8/500 55012 10044 20032 WEATHER SUMMARY FOR THURSDAY, DECEMBER 27 TEMPERATURE (DEGREES F) MAX.....36 NORMAL.....36 MIN.....31 NORMAL.....21 MEAN....34 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL.......... +6 TOTAL DEPARTURE FOR THE MONTH..........-74 [-2.9 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............31 DEPARTURE.......-6 TOTAL HEATING UNITS FOR THE MONTH...........973 DEPARTURE......+81 TOTAL HEATING UNITS FOR THE SEASON.........2053 DEPARTURE.....-128 TOTAL HEATING UNITS LAST SEASON TO DATE....1732 DIFFERENCE....+321 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............37 NNE AT 3:13 A.M. AEROVANE.............36 NNE AT 3:13 A.M. ASOS.................36 ENE AT 3:14 A.M. DAVIS................37 NE AT 3:13 A.M. FASTEST MILE FOR YESTERDAY............. 23 NNE AT 9:40 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........23 NE AT 9:31 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........24 NNE AT 9:31 A.M. AVERAGE WIND SPEED AND DIRECTION......11.4 NNE ASOS...............10.4 DAVIS..............10.1 NNE [019 deg] * LAST OF SEVERAL OCCURENCES PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.23 DEPARTURE....+0.08 ASOS..............0.24 TOTAL PRECIPITATION FOR THE MONTH..........6.14 DEPARTURE....+2.18 ASOS..............6.21 TOTAL PRECIPITATION FOR THE YEAR..........44.98 DEPARTURE....-5.64 ASOS.............44.43 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....+19.1 TOTAL SNOWFALL FOR THE SEASON..............29.0 DEPARTURE....+17.0 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 Aero 57 MPH 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 Aero 65 MPH W 12/18 31/10/21/-9/0/0/.../.. 20 W 12/19 38/24/31/+1/0.04/0/.../.. 19 E 12/20 33/26/30/0/0.90/7.4/000/00 24 NNW 12/21 28/22/25/-5/0.03/0.2/000/00 25 N 12/22 32/26/29/0/0/0/.../.. 21 ESE 12/23 54/33/44/+15/0.64/0/000/00 65 SE Aero 70 MPH SE 12/24 53/32/43/+14/0.01/0/.../.. 50 S Aero 51 MPH S 12/25 40/29/35/+6/0/0/.../.. 32 WSW 12/26 37/26/32/+4/0.22/0/.../.. 27 NNE 12/27 36/31/34/+6/0.58/T/000/00 37 NNE 12/28 morning low temp: 31F; our normal low is now 20F 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 28 HIGH 60 IN 1982 LOW -2 IN 1933 PRECIP 2.16 INS. IN 1967 SNOWFALL 9.5 INS. IN 1967 PEAK GUST 89 MPH SSE IN 1983 RECORDS FOR DECEMBER 29 HIGH 72 IN 1984 LOW -19 IN 1933 (RECORD FOR DECEMBER) PRECIP 1.91 INS. IN 1945 SNOWFALL 18.4 INS. IN 1945 PEAK GUST 95 MPH S IN 1966 (RECORD FOR DECEMBER) TODAY'S REPORT PREPARED By: Stephanie Radner