BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, FEBRUARY 1, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME BLUE HILL OBSERVATORY 125TH ANNIVERSARY! OUR RECORD BEGAN FEBRUARY 1, 1885 JANUARY 2010 SLIGHTLY WARMER THAN NORMAL WHILE PRECIPITATION AND SNOWFALL ARE SLIGHTLY BELOW NORMS It was just 125 years ago today that the day by day continuous meteorological record keeping began here at the Observatory. THE JANUARY 2010 STATS (additional data will be available tomorrow) 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: Clear, few stratocumulus offshore distant east Temperature: 19F, Dew point: 6F, Wind: WSW at 12 kts Sea-level pressure: 30.09 inches Hg, rising Visibility: 30 miles, light haze 6-hour minimum temp: 18F Average snow depth: Trace BHO SA 1155 CLR 30 190/19/6/2412/009/ FEW SC OFFSHR DSNT E LGT HZ/ 8/500 53020 10020 20018 10 A.M. Weather: Clear, few stratocumulus forming Temperature: 25F, Dew point: 9F, Wind: SW at 10 kts, Wind: Direction variable is SSW to W Sea-level pressure: 30.15 inches Hg, rising Visibility: 50 miles BHO SA 1455 CLR 50 210/25/9/2310/015/ FEW SC FRMG ALQDS GST 19 KTS PST HR WND 20V27/ 8/500 51020 1 P.M. Weather: Clear, occasional cumulus fractus forming Temperature: 31F, Dew point: 10F, Wind: WSW at 14G25 kts, Wind: Direction variable is SSW to WNW Sea-level pressure: 30.11 inches Hg, rising Visibility: 55 miles 6-hour max. temp: 31F BHO SA 1755 CLR 55 197/31/10/2514G25/011/ OCNL CUFRA FRMG DSNT HZ WND 21V29/ 8/100 58013 10031 20019 WEATHER SUMMARY FOR SUNDAY, JANUARY 31 TEMPERATURE (DEGREES F) MAX.....26 NORMAL.....34 MIN......9 NORMAL.....18 MEAN....18 NORMAL.....26 DEPARTURE FROM 30-YEAR AVERAGE.............-8 TOTAL DEPARTURE FOR THE JANUARY............+27 [+0.7 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............47 DEPARTURE........+8 TOTAL HEATING UNITS FOR THE MONTH..........1182 DEPARTURE.......-25 TOTAL HEATING UNITS FOR THE SEASON.........3426 DEPARTURE......-110 TOTAL HEATING UNITS LAST SEASON TO DATE....3568 DIFFERENCE.....-142 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............25 W AT 3:08 P.M. AEROVANE..............23 W AT 3:08 P.M. ASOS..................25 W AT 3:08 P.M. DAVIS.................26 W AT 3:07 P.M. THE FASTEST MILE FOR YESTERDAY.......... 19 W AT 3:05 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............18 W AT 3:09 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........19 W AT 3:08 P.M. AVERAGE WIND SPEED AND DIRECTION........12.3 NW ASOS.................12.0 DAVIS................12.1 W [280 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 JANUARY............4.03 DEPARTURE....-0.75 ASOS..............4.00 TOTAL PRECIPITATION FOR THE YEAR...........4.03 DEPARTURE....-0.75 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...............14.7 DEPARTURE.....-1.1 TOTAL SNOWFALL FOR THE SEASON..............44.5 DEPARTURE....+15.1 * * slight correction for the 1/31 report: departure reported as +15.8 should have been +15.7 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 our morning low temp: 18F; the normal low is now 18F NEW DAILY RECORD 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 1 HIGH 65F IN 1989 LOW -9F IN 1920 PRECIP 1.30 INS. IN 1898 SNOWFALL 11.0 INS. IN 1898 PEAK GUST 66e MPH SSW IN 1951 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 TODAY'S REPORT PREPARED BY: Robert Skilling