BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, JANUARY 11, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME STORM PROVIDES 6.0 INCHES OF SNOW THROUGH 1 P.M.... 7 A.M. Weather: Sky obscured by snow and fog Temperature: 31F, Dew point: 31F, Wind: NE at 15G21 kt Sea-level pressure: 29.75 inches Hg, falling Visibility: 1/16 of a mile 6-hour minimum temperature: 22F Snow depth on ground: 8 inches BHO SA 1155 W2 X1 1/16SF 075/31/31/0315G21/975/ TOTAL NEW SNW PST 24 HR 5.0 IN/ 8//// 4/008 56037 6/// 70055 10031 20022 10 A.M. Weather: Sky obscured by light snow and fog Temperature: 21F, Dew point: 18F, Wind: NW at 16G22 kt Sea-level pressure: 29.75 inches Hg, falling then rising Visibility: 1/4 of a mile BHO SA 1455 W2 X1 1/4S-F 075/21/18/3216G22/975/ 8//// 6/// 53000 1 P.M. Weather: Overcast Temperature: 20F, Dew point: 16F, Wind: NW at 16G22 kt Sea-level pressure: 29.81 inches Hg, rising Visibility: 7 miles 6-hour maximum temperature: 31F 6-hour snowfall: 1.0 inches 6-hour precipitation: 0.08 inches BHO SA 1755 15 OVC 7 096/20/16/3116G22/981/ TOTAL NEW SNW PST 6 HR 1.0 IN/ 8/6// 53021 6008/ 10031 20020 WEATHER SUMMARY FOR SATURDAY, JANUARY 10 TEMPERATURE (DEGREES F) MAX.....24 NORMAL.....34 MIN.....11 NORMAL.....18 MEAN....18 NORMAL.....26 DEPARTURE FROM 30-YEAR NORMAL...............-8 TOTAL DEPARTURE FOR THE MONTH..............-24 [-2.6 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............47 DEPARTURE.........+8 TOTAL HEATING UNITS FOR THE MONTH............409 DEPARTURE........+25 TOTAL HEATING UNITS FOR THE SEASON..........2649 DEPARTURE........-64 TOTAL HEATING UNITS LAST SEASON TO DATE.....2477 DIFFERENCE......+172 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............28 W AT 3:14 A.M. AEROVANE.............25 W AT 3:13 A.M. ASOS.................25 NW AT 4:00 A.M. DAVIS................25 W AT 3:14 A.M. FASTEST MILE FOR YESTERDAY..............23 W AT 4:01 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 WNW AT 4:03 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........19 W AT 4:03 A.M. AVERAGE.............9.2 W ASOS................8.8 DAVIS...............8.4 W [266 deg] *last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.55 DEPARTURE.........+0.39 ASOS...............0.50 TOTAL PRECIPITATION FOR THE MONTH...........1.88 DEPARTURE.........+0.36 ASOS...............2.82 # TOTAL PRECIPITATION FOR THE YEAR............1.88 DEPARTURE.........+0.36 ASOS...............2.82 # # Includes erroneous ASOS precipitation data on 1/1/09 and 1/2/09 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........5.0 DEPARTURE.........+4.5 TOTAL SNOWFALL FOR THE MONTH................5.9 DEPARTURE.........+0.9 TOTAL SNOWFALL FOR THE SEASON..............36.3 DEPARTURE........+17.7 PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 1/1 16/1/9/-18/0/0/538/98 44 WNW Aero 44 MPH WNW 1/2 32/9/21/-6/0/0/005/01 28 S 1/3 32/21/27/0/T/T/539/98 43 WNW Aero 44 MPH WNW 1/4 35/17/26/-1/0/0/512/93 36 W Aero 33 MPH W 1/5 36/26/31/+4/0.06/0/512/93 30 W 1/6 33/21/27/+1/0/0/183/33 27 W 1/7 36/26/31/+5/1.27/0.9/000/00 46 NE 1/8 38/21/30/+4/0/0/389/70 47 W 1/9 25/16/21/-5/0/0/.../.. 37 W 1/10 24/11/18/-8/.../../.../.. 28 W NEW DAILY RECORDS FOR JANUARY 2009... ..NONE.. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JANUARY 11 HIGH 59F IN 1975 LOW -7F IN 1968 PRECIP 1.14 INS. IN 1956 SNOW 10.2 INS. 1927 WIND 95e MPH S IN 1980 RECORDS FOR JANUARY 12 HIGH 57F IN 1913, 1975 LOW -15F IN 1886 PRECIP 1.46 INS. IN 1900 SNOW 6.0 INS. IN 1923 WIND 84e MPH S IN 1980 TODAY'S REPORT PREPARED By: Andrew Hoell