BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JANUARY 26, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME JANUARY TEMPERATURES BECOME LESS ONCE COLD AGAIN SUNSHINE THROUGH CONSIDERABLE HIGH CLOUDINESS Overcast the past week our average temperature has almost 2 degrees colder than normal. The colder weather has been gradually chipping away at the large positive temperature departure this month. The month was averaging 7 degrees on the warm side of normal through the 18th and that has now been reduced to 4.4 degrees through the 25th. Today's weather includes a moderation of the cold of the past two days. Sunshine has been dimmed by high cloudiness today, but for the month now we find 47% of the possible sunshine which is very close normal for the month. Today's observations: 7 A.M. Weather: Scattered cirrus, thin overcast cirrus Temperature: 18F, Dew point: 11F, Wind: WSW at 10 kts Sea-level pressure: 30.25 inches Hg, rising Visibility: 25 miles, light haze 6-hour min temp: 17F Snow depth on ground: 2 inches BHO SA 1155 220 SCT 250 -OVC 25 243/18/11/2510/025/ SC LYR FEW MDT CUFRM TOPS OFFSHR NE-ESE BINOVC DSNT NE-E MOON DMLY VSB LGT HZ/ 8/506 4/002 53013 10020 20017 10 A.M. Weather: High cirrus/cirrostratus overcast, overcast partly thin, breaks in overcast NW thru distant east, stratocumulus offshore distant NE-ESE Temperature: 25F, Dew point: 13F, Wind: W at 6 kts Sea-level pressure: 30.27 inches Hg, rising Visibility: 40 miles, 45 miles WNW BHO SA 1455 E250 OVC 40 251/25/13/2706/027/ SC FEW MDT CUFRM TOPS DSNT OFFSHR NE-ESE LWR CI S-SW OVC PTLY THN OVHD-NW-NE BINOVC N-DSNT E PARTIAL HALO VSB PST HR VSBY WNW 45/ 8/507 50008 WEATHER SUMMARY FOR FRIDAY, JANUARY 25 TEMPERATURE (DEGREES F) MAX.....28 NORMAL.....34 MIN.....11 NORMAL.....18 MEAN....20 NORMAL.....26 DEPARTURE FROM 30-YEAR NORMAL...........-6 TOTAL DEPARTURE FOR THE MONTH.........+116 [+4.4 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............45 DEPARTURE.......+6 TOTAL HEATING UNITS FOR THE MONTH...........859 DEPARTURE.....-115 TOTAL HEATING UNITS FOR THE SEASON.........3026 DEPARTURE.....-276 TOTAL HEATING UNITS LAST SEASON TO DATE....2667 DIFFERENCE....+359 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............36 W AT 12:37 P.M. AEROVANE.............33 W AT 12:37 P.M. ASOS.................33 W AT 12:37 P.M. DAVIS................35 W AT 12:37 P.M. FASTEST MILE FOR YESTERDAY..............24 W AT 3:48 P.M.* MAXIMUM 2-MINUTE ASOS AVERAGE...........24 W AT 3:49 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........27 W AT 12:37 P.M. AVERAGE WIND SPEED AND DIRECTION....... 14.5 W ASOS.................13.9 DAVIS................14.8 W [270 degrees] * 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..........3.70 DEPARTURE.....-0.18 ASOS..............3.81 TOTAL PRECIPITATION FOR THE YEAR...........3.70 DEPARTURE.....-0.18 ASOS..............3.81 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.5 TOTAL SNOWFALL FOR THE MONTH...............12.4 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE SEASON..............42.9 DEPARTURE....+16.8 PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 1/1 38/28/33/+6/0.24/1.8/049/09 30 E 1/2 29/7/18/-9/T/T/006/01 43 NW Aero 43 MPH NW 1/3 11/2/7/-20/0/0/539/98 35 NW 1/4 30/2/16/-11/0/0/242/44 31 SSW 1/5 38/24/31/+4/0/0/287/52 28 SSW 1/6 47/34/41/+15/0/0/133/24 27 SSW 1/7 54/39/47/+21/0/0/188/34 29 S 1/8 65/45/55/+29/0/0/283/51 37 S 1/9 59/42/51/+25/0.01/0/167/30 48 S 1/10 47/35/41/+15/0/0/340/61 35 W 1/11 55/35/45/+19/1.58/T/0/0 46 S Aero 48 MPH S 1/12 47/32/40/+14/0/0/376/67 28 W 1/13 42/30/36/+10/0/0/455/81 33 ENE 1/14 36/24/30/+4/1.45/10.3/000/00 37 NE Aero 36 MPH NE 1/15 30/21/26/0/T/T/000/00 25 NW 1/16 30/16/23/-3/0/0/560/99 28 NW 1/17 32/17/25/-1/T/T/165/29 * 23 ESE Aero 19 MPH ESE 1/18 44/28/36/+10/0.39/0.2/331/58 41 W Aero 39 MPH W 1/19 33/24/29/+4/0/0/086/15 * 25 W 1/20 29/13/21/-4/0/0/367/64 * 38 WNW Aero 40 MPH WNW 1/21 21/10/16/-10/0/0/564/98 35 W Aero 33 MPH W 1/22 37/15/26/+1/0.03/0.1/110/19 52 S Aero 55 MPH S 1/23 35/23/29/+4/0/0/574/99 31 W 1/24 29/19/24/-2/0/0/203/35 28 NW Aero 25 MPH NW 1/25 28/11/20/-6/0/0/583/100 36 W Aero 33 MPH W * slight changes in daily sunshine minutes and % have been made... 1/26 morning low temp. 17F; our normal low is now 18F NEW DAILY RECORDS FOR JANUARY 2008: 1/8 - New record high temperature of 65 deg; the previous record, 59 deg. in 1930 New record high minimum temperature of 45 deg; the previous record, 41 deg. in 1930, 1935, 1967 1/9 - New record high minimum temperature of 42 deg; the previous record, 39 deg. in 1937, 1956. 1/11 - New record rainfall of 1.58 inches; surpasses previous record of 1.14 inches in 1956 1/14 - New record daily snowfall of 10.3 inches; surpasses previous record of 9.0 inches in 1999. New record maximum daily precipitation of 1.45 inches; surpasses 1.35 inches in 2006 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 RECORDS FOR JANUARY 27 HIGH 63F IN 1974 LOW -12F IN 1924 PRECIP 1.59 INS. IN 1996 SNOWFALL 11.0 INS. IN 1894 PEAK GUST 91 MPH SSE IN 1996 TODAY'S REPORT PREPARED By: Robert Skilling