BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JANUARY 28, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear, few altocumulus W-NNE Temperature: 25F, Dew point: 18F, Wind: S at 8 kts, Sea-level pressure: 30.05 inches Hg, falling Visibility: 15 miles, hazy 6-hour minimum temp: 25F Average snow depth: None BHO SA 1155 CLR 15 176/25/18/1708/005/ FEW CI W-NNE HAZY/ 8/050 58012 10029 20025 10 A.M. Weather: Overcast altostratus Temperature: 31F, Dew point: 19F, Wind: S at 11 kts Sea-level pressure: 29.99 inches Hg, falling Visibility: 15 miles, hazy BHO SA 1455 E70 OVC 15 157/31/19/1711/999/ HAZY 8/07/ 58019 1 P.M. Weather: Overcast stratus, light snow Temperature: 32F, Dew point: 32F, Wind: S at 17 kts Sea-level pressure: 29.87 inches Hg, falling rapidly Visibility: 2 miles, snow and fog 6-hourly max. temp: 34F BHO SA 1755 E25 OVC 2S-F 116/32/32/1917/987/ PRESFR/ 8/7// 58041 MANUAL 6000/ 10034 20025 WEATHER SUMMARY FOR WEDNESDAY, JANUARY 27 TEMPERATURE (DEGREES F) MAX.....41 NORMAL.....34 MIN.....27 NORMAL.....18 MEAN....34 NORMAL.....26 DEPARTURE FROM 30-YEAR AVERAGE.............+8 TOTAL DEPARTURE FOR THE MONTH.............+64 [+2.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............31 DEPARTURE........-8 TOTAL HEATING UNITS FOR THE MONTH...........989 DEPARTURE.......-74 TOTAL HEATING UNITS FOR THE SEASON.........3233 DEPARTURE......-147 TOTAL HEATING UNITS LAST SEASON TO DATE....3411 DIFFERENCE.....-178 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............30 WSW AT 2:44 P.M. AEROVANE..............31 WSW AT 2:44 P.M. ASOS..................31 W AT 2:44 P.M. DAVIS.................30 WSW AT 2:43 A.M. THE FASTEST MILE FOR YESTERDAY.......... 23 WSW AT 2:44 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............21 W AT 2:45 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........21 WSW AT 2:44 P.M. AVERAGE WIND SPEED AND DIRECTION........12.3 WSW ASOS.................11.5 DAVIS................11.5 WSW [256 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..........3.94 DEPARTURE....-0.24 ASOS..............3.90 TOTAL PRECIPITATION FOR THE YEAR...........3.94 DEPARTURE....-0.24 ASOS..............3.90 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.5 TOTAL SNOWFALL FOR THE MONTH...............13.7 DEPARTURE.....+0.2 TOTAL SNOWFALL FOR THE SEASON..............43.5 DEPARTURE....+16.4 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/.../.. 33 WSW 1/27 41/25/34/+8/0/0/.../.. 30 WSW 1/28 our morning low temp. 25F; 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 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 JANUARY 28 HIGH 59F IN 1916 LOW -9F IN 1888, 1924 PRECIP 2.18 INS. IN 1897 SNOWFALL 15.0 INS. IN 1897 PEAK GUST 78e MPH SSE IN 1977 RECORDS FOR JANUARY 29 HIGH 66F IN 2002 LOW -11F IN 1888 PRECIP 1.48 INS. IN 1973 SNOWFALL 8.0 INS. IN 1943 PEAK GUST 72 MPH NW IN 1973 TODAY'S REPORT PREPARED BY: Stephanie Radner