BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, DECEMBER 27, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME APPROACHING WARM FRONT BRINGING RAIN, FOG AND WARMER TEMPERATURES TODAY... Light rain that began at 8:40 AM this morning turned moderate for a time at mid-day A total of 0.34 inch of rain was measured in the six hours ending at 1 PM. Most of this fell as moderate rain from 11:30 AM to 12:45 PM. The temperature has risen steadily from a low of 30 late Friday afternoon to 33 by midnight to the low 40s by early afternoon. The pressure was falling rapidly at 1 PM with a gusty south wind. Record high temperatures near 60 are possible on Sunday. 7 A.M. Weather: Overcast stratocumulus, few patches of thin ground fog S-NW Temperature: 38F, Dew point: 36F, Wind: S at 16 kts Sea-level pressure: 30.37 inches Hg, falling Visibility: 20 miles 6-hour minimum temperature: 34F 24-hour precipitation: 0.02 inch Snow on ground: 1 inch BHO SA 1155 E30 OVC 20 285/38/36/1716/037/ FEW PTCHS THN GF S-NW/ 8/5// 4/001 58014 70002 10038 20034 10 A.M. Weather: Broken stratocumulus, overcast nimbostratus with very light rain Temperature: 38F, Dew point: 35F, Wind: S at 15 kts Sea-level pressure: 30.33 inches Hg, falling Visibility: 10 miles BHO SA 1455 E20 BKN 30 OVC 10R- 270/38/35/1815/033/ PCPN VRY LGT/ 8/6// 56015 600// 1 P.M. Weather: Sky obscured in light rain and fog Temperature: 41F, Dew point: 41F, Wind: S at 21G28 kts Sea-level pressure: 30.21 inches Hg, falling rapidly Visibility: 1/4 mile, variable 1/8-1/2 mile 6-hour maximum temperature: 41F 6-hour precipitation: 0.34 inch BHO SA 1755 W3 X 1/4VR-F 231/41/41/1821G28/021/ VSBY 1/8V1/2 PRESFR PK WND 1828/51/ 8//// 58039 6034/ 10041 20038 WEATHER SUMMARY FOR FRIDAY, DECEMBER 26 TEMPERATURE (DEGREES F) MAX.....35 NORMAL.....36 MIN.....23 NORMAL.....21 MEAN....29 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL...............+1 TOTAL DEPARTURE FOR THE MONTH..............+26 [+0.8 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............36 DEPARTURE..........0 TOTAL HEATING UNITS FOR THE MONTH............836 DEPARTURE........-19 TOTAL HEATING UNITS FOR THE SEASON..........2086 DEPARTURE........-58 TOTAL HEATING UNITS LAST SEASON TO DATE.....2022 DIFFERENCE.......+64 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............25 SE AT 11:40 P.M. AEROVANE.............22 SE AT 11:55 P.M. ASOS.................22 SSE AT 11:41 P.M. DAVIS................26 SE AT 11:40 P.M. FASTEST MILE FOR YESTERDAY..............18 SE AT 11:37 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........16 SE AT 11:56 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........20 SE AT 10:31 P.M. AVERAGE............21.5 W ASOS...............19.5 DAVIS..............19.8 W [274 DEG] * Last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.02 DEPARTURE.........-0.13 ASOS...............0.04 TOTAL PRECIPITATION FOR THE MONTH...........8.05 DEPARTURE.........+4.24 ASOS...............8.12 TOTAL PRECIPITATION FOR THE YEAR...........58.34 DEPARTURE.........+7.87 ASOS..............61.13 # # 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....+13.8 TOTAL SNOWFALL FOR THE SEASON..............22.5 DEPARTURE....+10.9 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 morning low temp. 33F (midnight); normal low temp. now 21F 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 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: Mike Iacono