BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JANUARY 16, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME 7 A.M. Weather: Clear, stratocumulus NE-SE along/offshore, few altocumulus lenticularis SE-SW Temperature: 2F, Dew point: -6F, Wind: WSW at 11 kts Sea-level pressure: 30.39 inches Hg, rising Visibility: 35 miles 6-hour minimum temperature: 0F Snow depth on ground: 7 inches BHO SA 1155 CLR 35 292/2/-6/2511/039/ SC LYR MDT CUFRM TOPS ALG/OFFSHR NE-SE FEW ACSL SE-SW INVSN PRSNT/ 8/540 4/007 51015 10004 20000 10 A.M. Weather: Clear, stratocumulus NE-SE along/offshore Temperature: 10F, Dew point: -3F, Wind: W at 11 kts Sea-level pressure: 30.43 inches Hg, rising Visibility: 35 miles BHO SA 1455 CLR 35 306/10/-3/2811/043/ SC LYR MDT CUFRM TOPS ALG/OFFSHR NE-SE/ 8/500 51014 1 P.M. Weather: Clear, few stratocumulus all quadrants Temperature: 16F, Dew point: -8F, Wind: WSW at 12 kts, Wind: direction variability SSW-NW Sea-level pressure: 30.37 inches Hg, falling Visibility: 50 miles 6-hour maximum temperature: 17F BHO SA 1755 CLR 50 284/16/-8/2512/037/ FEW SC ALQDS WND 21V32/ 8/500 58022 10017 20001 WEATHER SUMMARY FOR THURSDAY, JANUARY 15 TEMPERATURE (DEGREES F) MAX.....16 NORMAL.....34 MIN......5 NORMAL.....18 MEAN....11 NORMAL.....26 DEPARTURE FROM 30-YEAR NORMAL..............-15 TOTAL DEPARTURE FOR THE MONTH..............-48 [-3.4 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............54 DEPARTURE........+15 TOTAL HEATING UNITS FOR THE MONTH............628 DEPARTURE........+49 TOTAL HEATING UNITS FOR THE SEASON..........2868 DEPARTURE........-40 TOTAL HEATING UNITS LAST SEASON TO DATE.....2625 DIFFERENCE......+243 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............20 NW AT 12:56 P.M. * AEROVANE.............18 NW AT 12:55 P.M. ASOS.................18 WNW AT 11:19 P.M. DAVIS................22 WNW AT 12:56 P.M. FASTEST MILE FOR YESTERDAY..............13 W AT 11:19 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........14 WNW AT 11:35 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........15 WNW AT 12:02 P.M. AVERAGE..............8.5 NW ASOS.................8.7 DAVIS................8.6 WNW [302 deg] * last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.........-0.16 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........2.04 DEPARTURE.........-0.28 ASOS...............3.02 # TOTAL PRECIPITATION FOR THE YEAR............2.04 DEPARTURE.........-0.28 ASOS...............3.02 # # Includes erroneous ASOS precipitation data on 1/1/09 and 1/2/09 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.........-0.5 TOTAL SNOWFALL FOR THE MONTH................7.6 DEPARTURE.........+0.1 TOTAL SNOWFALL FOR THE SEASON..............38.0 DEPARTURE........+16.9 PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2009 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 1/1 16/1/9/-18/0/0/538/98 44 WNW Aero 44 MPH WNW 1/2 32/9/21/-6/0/0/005/01 28 S 1/3 32/21/27/0/T/T/539/98 43 WNW Aero 44 MPH WNW 1/4 35/17/26/-1/0/0/512/93 36 W Aero 33 MPH W 1/5 36/26/31/+4/0.06/0/512/93 30 W 1/6 33/21/27/+1/0/0/183/33 27 W 1/7 36/26/31/+5/1.26/0.8/000/00 46 NE Aero 45 MPH NE 1/8 38/21/30/+4/0.01/0.1/389/70 47 W Aero 45 MPH W 1/9 25/16/21/-5/0/0/546/98 37 W Aero 36 MPH W 1/10 24/11/18/-8/0.10/1.0/329/59 28 W 1/11 31/19/25/-1/0.55/5.3/000/00 30 NW 1/12 27/18/23/-3/0.02/0.4/410/73 24 WNW 1/13 34/16/25/-1/0.04/T/107/19 25 SE 1/14 33/10/22/-4/0/0/518/92 47 W 1/15 16/5/11/-15/0/0/000/00 20 NW 1/16 morning low temp: 0F; our normal low is now 18F NEW DAILY RECORDS FOR JANUARY 2009... ..NONE.. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JANUARY 16 HIGH 63F IN 1995 LOW -12F IN 2004 PRECIP 1.32 INS. IN 1936 SNOWFALL 14.0 INS. IN 1965 PEAK GUST 79 MPH WNW IN 1960 RECORDS FOR JANUARY 17 HIGH 55F IN 1973,1995 LOW -8F IN 1907,1982 PRECIP 1.43 INS. IN 1956 SNOWFALL 13.4 INS. IN 1956 PEAK GUST 62 MPH S IN 1994 TODAY'S REPORT PREPARED By: Stephanie Radner