BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, DECEMBER 29, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME 7 A.M. Weather: Clear with a few clouds Temperature: 33F, Dew point: 25F, Wind: W at 16G20 kt Sea-level pressure: 29.90 inches Hg, rising Visibility: 20 miles 6-hour minimum temperature: 33F Snow on ground: 0 BHO SA 1155 CLR 20 126/33/25/2616G20/990/ FEW SC DSNT NE-S/ 8/400 53006 10036 20033 10 A.M. Weather: Clear with a few clouds Temperature: 39F, Dew point: 25F, Wind: W at 14G18 kt Sea-level pressure: 29.90 inches Hg, steady Visibility: 40 miles BHO SA 1455 CLR 40 125/39/25/2714G18/990/ FEW SC ALQDS/ 8/400 58001 WEATHER SUMMARY FOR SUNDAY, DECEMBER 28 TEMPERATURE (DEGREES F) MAX.....58 NORMAL.....36 MIN.....41 NORMAL.....20 MEAN....50 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL..............+22 TOTAL DEPARTURE FOR THE MONTH..............+60 [+1.9 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............15 DEPARTURE........-22 TOTAL HEATING UNITS FOR THE MONTH............876 DEPARTURE........-53 TOTAL HEATING UNITS FOR THE SEASON..........2126 DEPARTURE........-92 TOTAL HEATING UNITS LAST SEASON TO DATE.....2080 DIFFERENCE.......+46 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............44 SSW AT 1:12 P.M. * AEROVANE.............44 SSW AT 1:15 P.M. ASOS.................43 SW AT 5:53 P.M. DAVIS................N/A FASTEST MILE FOR YESTERDAY..............34 SSW AT 1:16 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........32 SW AT 2:30 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........N/A AVERAGE............22.6 SSW ASOS...............22.0 DAVIS..............N/A * Last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.........-0.15 ASOS...............0.06 TOTAL PRECIPITATION FOR THE MONTH...........8.40 DEPARTURE.........+4.29 ASOS...............8.62 TOTAL PRECIPITATION FOR THE YEAR...........58.69 DEPARTURE.........+7.92 ASOS..............61.63 # # Includes erroneous ASOS precipitation data on 2/13/08. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.4 TOTAL SNOWFALL FOR THE MONTH...............22.5 DEPARTURE....+13.0 TOTAL SNOWFALL FOR THE SEASON..............22.5 DEPARTURE....+10.1 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2008 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 12/1 59/43/51/+15/0.12/0.0/374/67 43 SSW 12/2 47/32/40/+4/0.00/0.0/451/81 33 SSW 12/3 44/29/37/+2/0.00/0.0/556/100 24 SSW 12/4 53/33/43/+8/T/0.0/122/22 42 SSW Aero 43 MPH S 12/5 38/26/32/-3/0.00/0.0/404/73 26 WNW 12/6 37/23/30/-4/0.00/0.0/309/56 21 S 12/7 32/20/26/-8/0.12/1.6/000/00 54 W Aero 53 MPH W 12/8 21/10/16/-17/0.00/0.0/462/84 50 W Aero 50 MPH W 12/9 53/13/33/0/0.01/T/000/00 48 S Aero 50 MPH S 12/10 60/37/49/+16/0.43/0.0/000/00 55 S Aero 58 MPH S 12/11 37/34/36/+4/1.52/T/000/00 38 NNE Aero 35 MPH NNE 12/12 61/28/45/+13/2.32/0.0/088/16 75 SSE Aero 76 MPH SSE 12/13 28/17/23/-9/0.00/0.0/531/97 33 W 12/14 43/17/30/-1/0.00/0.0/328/60 36 S 12/15 61/43/52/+21/0.00/0.0/076/15 55 S Aero 56 MPH S 12/16 57/26/42/+11/0.14/T/000/00 43 W 12/17 38/25/32/+1/0.46/1.2/000/00 26 E Aero 22 MPH E 12/18 37/28/33/+3/0.00/0.0/261/48 23 WSW 12/19 29/14/22/-8/1.28/../000/00 46 NE Aero 45 MPH NE 12/20 20/11/16/-14/.../../000/00 30 NNW 12/21 33/17/25/-5/.../../000/00 43 W Aero 44 MPH W 12/22 22/12/17/-12/0.00/0.0/544/100 47 W Aero 45 MPH W 12/23 27/9/18/-11/0.00/0.0/458/84 30 W 12/24 50/23/37/+8/.../../000/00 53 S 12/25 52/27/40/+11/.../../518/95 54 W 12/26 35/23/29/+1/0.00/0.0/.../.. 25 SE 12/27 47/33/40/+12/.../0.0/.../.. 37 S 12/28 58/41/50/+22/.../0.0/.../.. 43 SW NEW DAILY RECORDS FOR DECEMBER 2008... 12/12 PEAK GUST 75 MPH SSE; PREVIOUS 74 MPH W IN 2000 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: Andrew Hoell