BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, DECEMBER 27, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Obscured, fog Temperature: 36F, Dew point: 36F, Wind: N at 16G24 kts Wind: Peak gust past hour 28 kts N at 06:16 A.M. Wind variability: NNW-ENE Sea-level pressure: 29.98 inches Hg, falling Visibility: 3 miles, fog 6-hour min temp: 35F 24-hour precip: 0.57 inches Snow on ground: 1 inch (patchy snow cover) (2 to 4 inches in woods north side of hill) BHO SA 1155 W3 X 3F 153/36/36/0116G24/998/ PK WND 0128/16 WND 33V06 RE05/ 8//// 4/001 58003 MANUAL 600X/ ASOS 60027 MANUAL 70057 ASOS 70055 10036 20035 10 A.M. Weather: Obscured, fog Temperature: 35F, Dew point: 35F, Wind: N at 15G29 kts Wind: Peak gust past hour 30 kts NNE at 09:38 A.M. Wind variability: NW-NE Sea-level pressure: 29.99 inches Hg, rising Visibility: 3 miles, fog 3-hour precip: 0.09 inches BHO SA 1455 W3 X 3F 156/35/35/0115G29/999/ PK WND 0230/38 WND 32V05/ 8//// 53005 MANUAL 6009/ ASOS 60011 1 P.M. Weather: Obscured, fog, light rain Temperature: 33F, Dew point: 33F, Wind: NW at 07 kts Wind variability: W-N Sea-level pressure: 29.94 inches Hg, falling Visibility: 1/16 mile, fog, light rain 6-hourly max. temp. 36F 6-hour precip: 0.11 inches BHO SA 1755 W1 X 1/16R-F 140/33/33/3207/994/ WND 27V35/ 8//// 56016 MANUAL 6011/ ASOS 60013 10036 20034 WEATHER SUMMARY FOR WEDNESDAY, DECEMBER 26 TEMPERATURE (DEGREES F) MAX.....37 NORMAL.....36 MIN.....26 NORMAL.....21 MEAN....32 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL.......... +4 TOTAL DEPARTURE FOR THE MONTH..........-80 [-3.3 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............33 DEPARTURE.......-3 TOTAL HEATING UNITS FOR THE MONTH...........942 DEPARTURE......+87 TOTAL HEATING UNITS FOR THE SEASON.........2022 DEPARTURE.....-122 TOTAL HEATING UNITS LAST SEASON TO DATE....1702 DIFFERENCE....+320 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............27 NNE AT 11:57 P.M. AEROVANE.............25 NNE AT 11:40 P.M. ASOS.................25 NE AT 11:35 P.M. * DAVIS................26 NE AT 11:40 P.M. FASTEST MILE FOR YESTERDAY............. 18 NNE AT 11:38 P.M. ** MAXIMUM 2-MINUTE ASOS AVERAGE...........17 NE AT 11:53 P.M. * MAXIMUM 2-MINUTE DAVIS AVERAGE..........18 NE AT 11:35 P.M. AVERAGE WIND SPEED AND DIRECTION......8.0 W ASOS...............N/A * DAVIS..............8.2 NNW [329 deg] * ASOS WIND SYSTEM FUNCTION RESTORED 12/26/07 AT 12:00 NOON ** LAST OF SEVERAL OCCURENCES PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.57 DEPARTURE....+0.42 ASOS..............0.55 TOTAL PRECIPITATION FOR THE MONTH..........5.91 DEPARTURE....+2.10 ASOS..............5.97 TOTAL PRECIPITATION FOR THE YEAR..........44.75 DEPARTURE....-5.72 ASOS.............44.19 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.4 TOTAL SNOWFALL FOR THE MONTH...............28.2 DEPARTURE....+19.5 TOTAL SNOWFALL FOR THE SEASON..............29.0 DEPARTURE....+17.4 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/../../.../.. 27 NNE 12/27 morning low temp: 35F; our normal low is now 21F 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 27 HIGH 57 IN 1895,1949 LOW -4 IN 1903 PRECIP 2.43 INS. IN 1969 SNOWFALL 11.2 INS. IN 1947 PEAK GUST 53e W IN 1957,1978; WNW 1976 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 TODAY'S REPORT PREPARED By: Stephanie Radner