BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, JANUARY 25, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear with a few clouds Temperature: 3F, Dew point: -5F, Wind: SW at 10 kt Sea-level pressure: 30.28 inches Hg, steady Visibility: 40 miles 6-hour minimum temperature: 3F Snow depth on ground: 12 inches BHO SA 1155 CLR 40 253/3/-5/2310/028/ FEW SC NE-SE FEW CI NE AND SW HAZY/ 8/401 4/012 53003 10008 20003 10 A.M. Weather: Clear with a few clouds Temperature: 12F, Dew point: -1F, Wind: SSW at 10 kt Sea-level pressure: 30.29 inches Hg, steady Visibility: 55 miles BHO SA 1455 CLR 55 257/12/-1/2110/029/ FEW THN CI S FEW SC DSNT NE/ 8/401 50004 1 P.M. Weather: Thin scattered cirrus Temperature: 21F, Dew point: 0F, Wind: SSW at 15kt Sea-level pressure: 30.22 inches Hg, falling Visibility: 55 miles 6-hour maximum temperature: 21F BHO SA 1755 250 –SCT 55 234/21/0/2015/022/ FEW SC NE/ 8/401 58023 10021 20003 WEATHER SUMMARY FOR SATURDAY, JANUARY 24 TEMPERATURE (DEGREES F) MAX.....36 NORMAL.....33 MIN......9 NORMAL.....18 MEAN....23 NORMAL.....26 DEPARTURE FROM 30-YEAR NORMAL...............-3 TOTAL DEPARTURE FOR THE MONTH..............-92 [-4.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............42 DEPARTURE.........+2 TOTAL HEATING UNITS FOR THE MONTH...........1028 DEPARTURE........+94 TOTAL HEATING UNITS FOR THE SEASON..........3268 DEPARTURE.........+5 TOTAL HEATING UNITS LAST SEASON TO DATE.....2981 DIFFERENCE......+287 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............40 W AT 10:57 A.M. * AEROVANE.............42 W AT 10:57 A.M. ASOS.................41 NW AT 2:25 P.M. DAVIS................40 WSW AT 11:00 A.M. FASTEST MILE FOR YESTERDAY..............33 W AT 10:24 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........31 W AT 10:25 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........29 W AT 1:04 P.M. AVERAGE............19.8 W ASOS...............18.0 DAVIS..............18.6 W [261 deg] * Last of several occurrences 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...........2.86 DEPARTURE.........-0.87 ASOS...............3.94 # TOTAL PRECIPITATION FOR THE YEAR............2.86 DEPARTURE.........-0.87 ASOS...............3.94 # # 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...............20.6 DEPARTURE.........+8.6 TOTAL SNOWFALL FOR THE SEASON..............51.0 DEPARTURE........+25.4 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 Aero 48 MPH W 1/15 16/5/11/-15/0/0/000/00 20 NW 1/16 17/0/9/-17/0/0/557/98 26 W 1/17 19/1/10/-16/0/0/450/79 23 W 1/18 29/14/22/-4/0.58/9.5/000/00 24 E 1/19 32/19/26/+1/0.24/3.5/057/10 18 NW 1/20 30/17/24/-1/T/T/247/43 30 NW 1/21 23/9/16/-9/0/0/.../.. 25 SW 1/22 31/14/23/-2/0/0/.../.. 31 SW 1/23 39/24/32/+7/0/0/.../.. 31 S 1/24 36/9/23/-3/0/0/.../.. 40 W 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 25 HIGH 55F IN 1990 LOW -10F IN 1935 PRECIP 2.24 INS. IN 1979 SNOWFALL 12.5 INS. IN 1941 PEAK GUST 81 MPH WNW IN 1972 RECORDS FOR JANUARY 26 HIGH 68F IN 1950 [RECORD FOR MONTH] LOW -5F IN 1920 PRECIP 1.60 INS. IN 1958 SNOW 9.0 INS. IN 1898 WIND 90e MPH SE IN 1978 TODAY'S REPORT PREPARED By: Andrew Hoell