BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, DECEMBER 29, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME LIGHT RAIN AND FOG THIS MORNING...SUNSHINE RETURNS THIS AFTERNOON... The storm total rainfall was 0.13 inch with 0.08 measured before 7 AM this morning and another 0.05 for the six hours ending at 1 PM today. The high temperature for the day so far of 45 occurred at mid-morning. The wind shifted from SSE to W just before 10 AM, which dropped the temperature into the upper 30s. Light drizzle ended shortly after 11 AM. Just a trace of old snow remains in patches on the summit. Today's observations: 7 A.M. Weather: Sky obscured in light rain and dense fog Temperature: 40F, Dew point: 40F, Wind: ESE at 14G26 kts Sea-level pressure: 29.95 inches Hg, falling Visibility: 1/8 mile 6-hour min temp: 35F 24-hour precip: 0.08 inches Snow on ground: trace (patchy snow cover) BHO SA 1155 W3 X 1/8R-F 142/40/40/1514G26/995/ PK WND 1527/09/ 8//// 56047 6008/ 70008 10040 20035 10 A.M. Weather: Sky obscured in light drizzle and dense fog Temperature: 43F, Dew point: 43F, Wind: W at 7 kts Sea-level pressure: 29.90 inches Hg, falling Visibility: 0 miles, ceiling 100 feet BHO SA 1455 W1 X 0L-F 125/43/43/2807/990/ WND LGT/ 8//// 56017 6005/ 1 P.M. Weather: Sky obscured in dense fog Temperature: 39F, Dew point: 39F, Wind: W at 9 kts Sea-level pressure: 29.86 inches Hg, falling Visibility: 1/16 mile 6-hour max. temp. 45F 6-hour precip: 0.05 inch BHO SA 1755 W1 X 1/16F 111/39/39/2609/986/ 8//// 56014 6005/ 10045 20038 WEATHER SUMMARY FOR FRIDAY, DECEMBER 28 TEMPERATURE (DEGREES F) MAX.....44 NORMAL.....36 MIN.....31 NORMAL.....20 MEAN....38 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL..........+10 TOTAL DEPARTURE FOR THE MONTH..........-64 [-2.5 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............27 DEPARTURE......-10 TOTAL HEATING UNITS FOR THE MONTH..........1000 DEPARTURE......+71 TOTAL HEATING UNITS FOR THE SEASON.........2080 DEPARTURE.....-138 TOTAL HEATING UNITS LAST SEASON TO DATE....1762 DIFFERENCE....+318 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............28 WSW AT 6:42 A.M. * AEROVANE.............26 WSW AT 6:42 A.M. * ASOS.................25 W AT 6:42 A.M. DAVIS................25 WSW AT 9:44 A.M. FASTEST MILE FOR YESTERDAY..............21 WSW AT 6:39 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 W AT 6:32 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........19 WSW AT 9:46 A.M. AVERAGE WIND SPEED AND DIRECTION......11.9 WSW ASOS...............11.1 DAVIS...............6.3 W [261 deg] * Last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.08 DEPARTURE....-0.07 ASOS..............0.07 TOTAL PRECIPITATION FOR THE MONTH..........6.22 DEPARTURE....+2.11 ASOS..............6.28 TOTAL PRECIPITATION FOR THE YEAR..........45.06 DEPARTURE....-5.71 ASOS.............44.50 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....+18.7 TOTAL SNOWFALL FOR THE SEASON..............29.0 DEPARTURE....+16.6 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 44/31/38/+10/../../404/74 28 WSW 12/29 morning low temp: 35F; 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 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) RECORDS FOR DECEMBER 30 HIGH 60 IN 1984 LOW -18 IN 1933 PRECIP 1.48 INS. IN 1891 SNOWFALL 7.5 INS. IN 1956 PEAK GUST 81 MPH WNW IN 1962 TODAY'S REPORT PREPARED By: Mike Iacono