BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, DECEMBER 27, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Obscured by rain and fog Temperature: 50F, Dew point: 50F, Wind: ESE at 16G36 Sea-level pressure: 29.90 inches Hg, falling Visibility: 1/2 of a mile 6-hour minimum temp: 42F 24-hour precipitation: 0.25 inch Average snow depth: 1 inch BHO SA 1155 W3 X 1/2RF 126/50/50/1216G36/990/ PK WND 1239/1124/ 8//// 4/001 56033 6//// 70025 10050 20042 10 A.M. Weather: Obscured by rain and fog Temperature: 51F, Dew point: 51F, Wind: ESE at 26G28 kt Sea-level pressure: 29.81 inches Hg, falling Visibility: 1/4 of a mile 3-hour precipitation: 0.14 inches BHO SA 1455 W2 X 1/4R-F 096/51/51/1226G38/981/ PK WND 1240/1442/ 8//// 58030 6014/ 1 P.M. Weather: Obscured by rain and fog Temperature: 52F, Dew point: 52F, Wind: SSE at 19G24 kt Sea-level pressure: 29.71 inches Hg, falling Visibility: 1/4 of a mile 6-hour maximum temp: 52F 6-hour precipitation: 0.20 inches BHO SA 1755 W2 X 1/4F 060/52/52/1619G24/971/ STA DFTG OVR SMT WND VEERING PK WND 1528/1740/ 8//// 56036 6020/ 10052 20050 WEATHER SUMMARY FOR SATURDAY, DECEMBER 26 TEMPERATURE (DEGREES F) MAX.....42 NORMAL.....36 MIN.....30 NORMAL.....21 MEAN....36 NORMAL.....28 DEPARTURE FROM 30-YEAR AVERAGE.............+8 TOTAL DEPARTURE FOR THE MONTH.............-36 [-1.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............29 DEPARTURE........-7 TOTAL HEATING UNITS FOR THE MONTH...........898 DEPARTURE.......+43 TOTAL HEATING UNITS FOR THE SEASON.........2058 DEPARTURE.......-86 TOTAL HEATING UNITS LAST SEASON TO DATE....2086 DIFFERENCE......-28 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............38 E AT 10:58 P.M. AEROVANE..............36 E AT 10:56 P.M. ASOS..................38 ESE AT 11:08 P.M. DAVIS.................37 E AT 11:08 P.M. THE FASTEST MILE FOR YESTERDAY...........29 E AT 11:01 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............26 ESE AT 11:04 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........28 E AT 11:04 A.M. AVERAGE WIND SPEED AND DIRECTION.......16.7 ENE ASOS................16.0 DAVIS...............16.0 ENE [75 DEG] * last of several occurrences.... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.25 DEPARTURE....+0.10 ASOS..............0.27 TOTAL PRECIPITATION FOR THE MONTH..........5.27 DEPARTURE....+1.46 ASOS..............5.42 TOTAL PRECIPITATION FOR THE YEAR..........54.84 DEPARTURE....+4.37 ASOS.............56.18 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.4 TOTAL SNOWFALL FOR THE MONTH...............25.0 DEPARTURE....+16.3 TOTAL SNOWFALL FOR THE SEASON..............28.0 DEPARTURE....+16.4 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 12/1 41/28/35/-1/0/0/497/89 29 NW 12/2 51/33/42/+6/0.08/0/345/62 30 SSE 12/3 67/47/57/+22/1.01/0/428/77 69 SSE AERO 73 MPH SSE 12/4 52/40/46/+11/0/0/488/88 26 W 12/5 42/30/36/+1/0.79/4.7/000/00 36 N 12/6 33/25/29/-5/0.09/0.6/513/93 36 NW 12/7 36/25/31/-3/0/0/050/09 22 WSW 12/8 39/25/32/-3/0/0/512/93 27 WNW 12/9 45/29/37/+4/1.23/5.7/000/00 52 ENE AERO 46 MPH ENE 12/10 40/26/33/0/0/0/351/64 46 WSW AERO 39 MPH W 12/11 26/20/23/-9/0/0/395/72 46 WSW AERO 41 MPH WSW 12/12 30/18/24/-8/0/0/548/100 36 W AERO 33 MPH W 12/13 46/23/35/+3/0.74/0/274/50 35 SSE AERO 31 MPH SSE 12/14 41/33/37/+6/0/0/186/34 29 NW 12/15 46/34/40/+9/0/0/006/01 35 W AERO 32 MPH W 12/16 35/22/29/-2/T/T/459/84 43 W AERO 44 MPH W 12/17 22/7/15/-16/0/0/545/100 52 WNW AERO 52 MPH WNW 12/18 26/6/16/-14/0/0/540/99 37 W AERO 37 MPH W 12/19 30/14/22/-8/0.01/0.1/000/00 38 N 12/20 26/16/21/-9/1.04/13.7/000/00 42 NNW 12/21 30/15/23/-7/0/0/409/75 45 WNW AERO 45 MPH WNW 12/22 28/14/21/-8/0/0/.../.. 35 W 12/23 23/10/17/-12/0/0/.../.. 29 W 12/24 36/14/25/-4/0/0/.../.. 31 NW 12/25 35/25/30/+1/.../../.../.. 18 NNE 12/26 42/30/36/+8/.../../.../.. 38 E NEW DAILY RECORD FOR DECEMBER 2009 12/3 NEW RECORD HIGH MAXIMUM TEMPERATURE of 67F; surpasses previous record of 61F in 1932, 1950. 12/20 NEW RECORD DAILY SNOWFALL 13.7 INCHES; surpasses previous record of 8.3 inches in 1995 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: Andrew Hoell