BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY DECEMBER 14, 2004 DISCUSSION AT 1 P.M. ARCTIC AIR ADVECTION TODAY... WINTRY COLD FINALLY ARRIVES THIS MORNING... TEMPS. CHECKED IN THE UPPER 20'S EARLY THIS AFTERNOON DECEMBER TEMPS. AVERAGING 4.5 DEGREES WARMER THAN NORMAL.. The last of the warmer than normal days was yesterday with eleven out of thirteen days Dec. 1 through 13 averaging warmer than normal and a monthly departure of plus 4.5 degrees. Temperatures reached a daytime maximum of 31 degrees between 7 and 8 a.m. this morning and have dropped to 27 to 28 degrees since then with 25 degrees at the 18-foot level of the north window with this continuing cold air advection at 1 p.m. We missed the morning snow flurries here with them staying to the west through north through northeast of here . TODAY'S OBSERVATIONS 7 a.m. scattered clouds with snow flurries observed distant northwest thru north and visibility of 35 miles; temp. 31; dewpoint 25; wind wsw at 18 gusting to 24 mph; six hourly min. temp. 30; 24 hourly precip. trace BHO SA 1155 37 SCT 35 089/31/25/2416G21/979/ FEW LWR CUFRA VIRGA DSNT NW-NNE VSBY WNW 45 WND 21V27/ 8/800 53025 10032 20030 10 a.m. scattered clouds with 60 miles visibility and 27 deg.; dewpoint 14; wind wnw at 21 gusting 29 mph.... BHO SA 1455 32 SCT 60 132/27/14/2918G25/992/ CLRG SKY PK WND 3028/29/ 8/500 53043 1 p.m. clear with a few clouds and 70 miles visibility but the mountains 60 to 70 to our northwest appear to be in clouds; visibility is then reported at a limit of 70 miles; temp. 28; dewpoint 11; wind wnw 17 gusting to 25 mph; six hourly max. temp. 31; six hourly min. temp. 27... BHO SA 1755 CLR 70 142/28/11/2915G22/995/ FEW SC ALQDS PK WND 2927/03/ 8/500 53010 10031 20027 WEATHER SUMMARY FOR MONDAY DECEMBER 13: TEMPERATURE (DEGREES F) MAX.....44 NORMAL.....39 MIN.....33 NORMAL.....24 MEAN....39 NORMAL.....32 DEPARTURE FROM 30-YEAR NORMAL.....+ 7 TOTAL DEPARTURE FOR THE MONTH.....+ 61 (4.5 degrees/day) PEAK WIND GUST FOR YESTERDAY........30 WSW AT 6:51 P.M. AEROVANE.........29 WSW AT 6:51 P.M. ASOS.............28 WSW AT 6:51 P.M. DAVIS............29 WSW AT 12:04 P.M. FASTEST MILE FOR YESTERDAY..........22 SW AT 10:42 P.M. HIGHEST ASOS 2 MIN AV..............21 WSW AT 11:48 P.M. HIGHEST ONE MIN. WIND FOR DAVIS ....24 S AT 12:54 A.M. AVERAGE WIND SPEED AND DIRECTION.. 13.4 SW AVERAGE WIND SPEED FOR ASOS..........14.0 S 180 deg. AVERAGE WIND FOR THE DAVIS SYSTEM....13.6 SSW 210 deg. PRECIPITATION (INCHES) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace DEPARTURE....-0.14 ASOS..............0.00 TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 TOTAL SNOWFALL THIS MONTH TO DATE...........0.2 DEPARTURE....-3.3 TOTAL PRECIPITATION FOR THE MONTH..........3.20 DEPARTURE....+1.27 ASOS..............3.27 TOTAL PRECIPITATION FOR THE YEAR..........52.18 DEPARTURE....+3.59 ASOS.............50.59 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2004......CALENDAR DAY DATA DATA REPORTED: 24 HOUR PERIODS ENDING MIDNIGHT EST DATE MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST ... SUNSHINE DATA NOT YET AVAILABLE 12/1 55/39/47/+11/0.80/0/073/13 62 MPH SE Aero 65 MPH SSE 12/2 46/36/41/+5/0/0/379/68 50 MPH W Aero 51 MPH W 12/3 45/32/39/+4/0/0/378/68 33 MPH W 12/4 39/25/32/-3/0/0/500/90 31 MPH SSW 12/5 50/26/38/+3/0/0/532/96 46 MPH W Aero 51 MPH W 12/6 33/20/27/-7/0.03/0.2/000/00 22 MPH NE 12/7 45/32/39/+5/1.48/0/000/00 37 MPH ENE 12/8 52/34/43/+10/0.04/0/402/73 55 MPH W Aero 58 MPH W 12/9 41/32/37/+4/0/0/143/26 25 MPH W 12/10 44/37/41/+8/0.77/0/000/00 40 MPH NE 12/11 44/38/41/+9/0.07/0/000/00 35 MPH NNE 12/12 43/33/38/+6/0/0/099/18 32 MPH W 12/13 44/33/39/+7/0.01/0/050/09 30 MPH WSW 12/14 morning high temp. 33 deg at midnight... OUR DAILY EXTREMES.... Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 14 HIGH 62 IN 1901 LOW -06 IN 1893 PRECIP 1.94 INS. IN 2002 SNOWFALL 8.0 INS. IN 1907 PEAK GUST 78e ENE IN 1941 RECORDS FOR DECEMBER 15 HIGH 64 IN 1975 LOW 04 IN 1900, 1905, 1933 PRE 1.80 INS. IN 1981 SNOW 7.5 INS. IN 1951 PEAK GUST 65 MPH NW IN 1991 Today's report by: Robert Skilling