BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, FEBRUARY 2, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME THE JANUARY 2010 STATS Temp: deg. F Av. Max. 33.7 Av. Min. 19.6 Mean 26.7 [+0.7] 24-hour corr. mean 26.4 Total heating units: 1182 [-25] Seasonal heating units: 3426 [-110] Total precip: 4.03 ins. [-0.75] Greatest in 24 hours: 1.56 ins. [17-18th] Total snowfall: 14.7 ins. [-1.1] Seasonal snowfall: 44.5 ins. [+15.1] Sunshine: 8629 mins. or 143.8 hrs. or 49% (astronomical data) 8376 mins. or 139.6 hrs. or 49% (sunshine card data) Average wind speed: 13.5 mph (13.8 mph corrected) ASOS average wind speed: 13.1 mph Prevailing wind direction: W 33% Today's observations: 7 A.M. Weather: Thin scattered cirrus, thin overcast cirrus radiatus, stratocumulus along and offshore NNE-ESE and few altocumulus lenticularis SE-SW, break in overcast to the distant E-S Temperature: 18F, Dew point: 9F, Wind: W at 9 kts Sea-level pressure: 30.24 inches Hg, rising Visibility: 35 miles, 45 miles WNW, light haze 6-hour minimum temp: 17F Average snow depth: Trace BHO SA 1155 250 ñSCT 300 ñOVC 35 240/18/9/2709/024/ SC ALG/OFFSHR NNE-ESE FEW ACSL SE-SW BINOVC DSNT E-S VSBY WNW 45 LGT HZ/ 8/541 53007 10022 20017 10 A.M. Weather: High cirrostratus overcast, partly thin north thru east and with break in overcast north thru east, few stratocumulus distant NNW-N and offshore distant NNE-ESE, halo Temperature: 25F, Dew point: 10F, Wind: W at 6 kts, Sea-level pressure: 30.27 inches Hg, falling Visibility: 50 miles, light distant haze BHO SA 1455 E250 OVC 50 250/25/10/2806/027/ FEW SC DSNT NNW-N AND OFFSHR DSNT NNE-ESE OVC PTLY THN N-E BINOVC N-E HALO LGT DSNT HZ/ 8/507 50010 1 P.M. Weather: High dense cirrostratus overcast, break in the overcast distant N-NE few stratocumulus offshore distant NNE-E Temperature: 27F, Dew point: 10F, Wind: WSW at 4 kts, Sea-level pressure: 30.20 inches Hg, falling Visibility: 55 miles 6-hour max. temp: 27F BHO SA 1755 E250 OVC 55 227/27/10/2404/020/ FEW SC OFFSHR DSNT NNE-E BINOVC DSNT N-NE LGT DSNT HZ/ 8/007 58023 10027 20018 WEATHER SUMMARY FOR MONDAY, FEBRUARY 1 TEMPERATURE (DEGREES F) MAX.....32 NORMAL.....34 MIN.....18 NORMAL.....18 MEAN....25 NORMAL.....26 DEPARTURE FROM 30-YEAR AVERAGE..............-1 TOTAL DEPARTURE FOR THE MONTH...............-1 [-1.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............40 DEPARTURE........+1 TOTAL HEATING UNITS FOR THE MONTH............40 DEPARTURE....... +1 TOTAL HEATING UNITS FOR THE SEASON.........3466 DEPARTURE......-109 TOTAL HEATING UNITS LAST SEASON TO DATE....3603 DIFFERENCE.....-137 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............31 WSW AT 1:37 P.M. AEROVANE..............30 WSW AT 1:37 P.M. ASOS..................31 WSW AT 1:35 P.M. DAVIS.................33 W AT 3:53 P.M. THE FASTEST MILE FOR YESTERDAY.......... 25 WSW AT 1:36 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............24 WSW AT 1:37 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 WSW AT 1:36 P.M. AVERAGE WIND SPEED AND DIRECTION........14.6 WSW ASOS.................13.5 DAVIS................13.2 WSW [250 DEG.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.00 DEPARTURE....-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR...........4.03 DEPARTURE....-0.90 ASOS..............4.00 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.6 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE.....-0.6 TOTAL SNOWFALL FOR THE SEASON..............44.5 DEPARTURE....+14.5 PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2010 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 1/1 31/23/27/0/0.01/0.1/005/01 24 NW 1/2 28/19/24/-3/0.45/5.7/000/00 53 W AERO 55 MPH W 1/3 25/13/19/-8/0.34/4.3/000/00 45 W AER0 44 MPH W 1/4 32/20/26/-1/0/0/397/72 35 W AERO 28 MPH W 1/5 29/18/24/-3/0/0/000/00 29 WNW 1/6 30/17/24/-2/0/0/554/100 33 W 1/7 37/21/29/+3/0/0/549/99 31 W 1/8 25/16/21/-5/0.04/0.6/000/00 22 WNW 1/9 25/10/18/-8/0/0/557/100 31 WNW 1/10 26/5/16/-10/0/0/508/91 23 WNW 1/11 33/12/23/-3/0/0/526/94 21 W 1/12 32/12/22/-4/0/0/146/26 36 WNW AERO 33 MPH WNW 1/13 28/9/19/-7/T/T/303/54 28 WNW AERO 31 MPH WNW 1/14 36/19/28/+2/0/0/486/86 25 S 1/15 44/28/36/+10/0/0/153/27 35 W 1/16 45/29/37/+11/0/0/488/86 28 WSW 1/17 40/30/35/+9/0.52/T/011/02 36 NNE 1/18 34/28/31/+5/1.04/1.9/000/00 45 N AERO 46 MPH N 1/19 33/28/31/+6/0.27/1.1/000/00 16 SSE 1/20 34/28/31/+6/T/T/023/04 34 NW 1/21 38/24/31/+6/0/0/571/99 24 WNW 1/22 37/23/30/+5/0/0/353/61 35 NNE AERO 33 MPH NNE 1/23 36/19/28/+3/0/0/581/100 24 N 1/24 41/25/33/+7/0/0/029/05 23 SE 1/25 56/41/49/+23/1.27/0/000/00 66 SE AERO 74 MPH SE 1/26 49/31/40/+14/T/T/299/51 33 WSW 1/27 41/25/34/+8/0/0/471/80 30 WSW 1/28 34/15/25/-1/0.09/1.0/077/13 48 W AERO 51 MPH W 1/29 18/7/13/-13/0/0/587/99 58 W AERO 60 MPH W 1/30 20/2/11/-15/0/0/399/67 35 W AERO 36 MPH W 1/31 26/9/18/-8/0/0/556/93 25 W 2/1 32/18/25/-1/0/0/.../.. 31 WSW 2/2 our morning low temp: 17F; the normal low is 18F NEW DAILY RECORDS FOR JANUARY 2010 1/25 NEW RECORD HIGH MAXIMUM TEMPERATURE of 56F; surpasses previous record of 55F in 1990 1/25 NEW RECORD HIGH MINIMUM TEMPERATURE OF 41F; surpasses previous record of 38F in 1990 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 2 HIGH 55F IN 1951, 1973 LOW -12F IN 1961 PRECIP 1.91 INS. IN 1999 SNOWFALL 5.5 INS. IN 1916, 1934 PEAK GUST 92 MPH SW IN 1970 RECORDS FOR FEBRUARY 3 HIGH 58F IN 1991 LOW -7F IN 1955 PRECIP 2.14 INS. IN 1970 SNOWFALL 7.0 INS. IN 1913 PEAK GUST 102 MPH S IN 1970 [RECORD FOR MONTH] TODAY'S REPORT PREPARED BY: Robert Skilling