BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, FEBRUARY 18, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast Temperature: 25F, Dew point: 15F, Wind: SSW at 10 kt Sea-level pressure: 29.64 inches Hg, falling Visibility: 35 miles Snow on ground: 1 inch BHO SA 1155 180 BKN 200 –OVC 35 036/25/15/2110/964/ FEW ACSL ALQDS/ 8/071 4/001 56005 10028 20024 10 A.M. Weather: Overcast Temperature: 29F, Dew point: 20F, Wind: SW at 6 kt Peak wind: 29.63 inches Hg, falling Sea-level pressure: 29.63 inches Hg, falling Visibility: 25 miles BHO SA 1455 180 BKN 200 OVC 25 033/29/20/2306/963/ FEW BINOVC E/ 8/073 58003 WEATHER SUMMARY FOR SATURDAY, FEBRUARY 17 TEMPERATURE (DEGREES F) MAX.....34 NORMAL.....37 MIN.....17 NORMAL.....21 MEAN....26 NORMAL.....29 DEPARTURE FROM 30-YEAR NORMAL..........-3 TOTAL DEPARTURE FOR THE MONTH........-106 (-6.4 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........50 DEPARTURE.......+13 TOTAL HEATING UNITS FOR THE MONTH.........713 DEPARTURE......+103 TOTAL HEATING UNITS FOR THE SEASON.......3657 DEPARTURE......-489 TOTAL HEATING UNITS LAST SEASON TO DATE..3632 DIFFERENCE......+61 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............42 W AT 12:03 A.M. AEROVANE.............39 W AT 1:22 A.M. ASOS.................37 WSW AT 1:23 A.M. DAVIS................40 WSW FASTEST MILE FOR YESTERDAY..............M MAXIMUM 2-MINUTE ASOS AVERAGE...........30 W AT 12:20 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........31 W AVERAGE WIND SPEED AND DIRECTION......17.5 SW ASOS..............16.5 DAVIS.............17.1 WSW [237 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.34 DEPARTURE.....-0.11 ASOS..............2.35 TOTAL PRECIPITATION FOR THE YEAR...........5.28 DEPARTURE.....-1.95 ASOS..............5.22 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE......-0.5 TOTAL SNOWFALL FOR THE MONTH................2.3 DEPARTURE......-8.2 TOTAL SNOWFALL FOR THE SEASON...............8.9 DEPARTURE.....-31.0 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 2/1 35/20/28/+2/0/0/126/21 37 S Aero 34 MPH S 2/2 35/28/32/+6/0.18/0.3/000/00 20 NW 2/3 32/19/26/0/0.05/0.4/574/95 39 W Aero 47 MPH W 2/4 22/10/16/-10/0/0/601/99 39 WSW Aero 40 MPH WSW 2/5 16/5/11/-16/0/0/493/81 61 W Aero 60 MPH W 2/6 24/10/17/-10/0/0/593/97 38 W Aero 36 MPH W 2/7 21/8/15/-12/0/0/474/77 43 W Aero 41 MPH W 2/8 25/11/18/-9/0/0/370/60 48 WSW 2/9 26/15/21/-6/0/0/600/97 44 WSW Aero 42 MPH WSW 2/10 32/13/23/-4/0/0/199/32 28 W 2/11 31/14/23/-4/0/0/456/73 27 SSW 2/12 36/20/28/0/0/0/602/96 43 WSW Aero 40 MPH W 2/13 22/6/14/-14/0.02/0.2/226/36 28 NW 2/14 36/13/25/-3/2.09/1.4/000/00 47 NE Aero 52 MPH NE 2/15 21/9/15/-13/0/0/616/97 46 W Aero 53 MPH W 2/16 27/9/18/-10/0/0/.../.. 51 W Aero 49 MPH W 2/17 34/17/26/-3/0/0/.../.. 42 W DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 18 HIGH 65F IN 1981 LOW -10F IN 1958 PRECIP 1.97 INCHES IN 1887 SNOWFALL 9.2 INCHES IN 1952 PEAK GUST 65e MPH NNW IN 1952 RECORDS FOR FEBRUARY 19 HIGH 66F IN 1981 LOW -5F IN 1923 PRECIP 2.73 INCHES IN 1972 SNOWFALL 12.0 INCHES IN 1893 PEAK GUST 76 MPH ENE IN 1972 TODAY'S REPORT By: Andrew Hoell