BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, MARCH 25, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME ANOTHER VERY SUNNY AND DRY DAY TEMPERATURES RISING THRU THE 40'S Today is the 13th very sunny day so far during this month of March (85% or more of the possible sunshine). The month has close to 60% of the possible sunshine to date and is well above the long-term average of 48%. Temperatures started out at a near normal low of 29F this morning and have risen to the mid-40's along with a light to gentle northeast breeze. Today's observations: 7 A.M. Weather: Clear [SKC], not a cloud to be seen Temperature: 33F, Dew point: 17F, Wind: N at 12G18 kts, Wind: diection variability NW-NNE Wind: wind gradually veering Sea-level pressure: 30.41 inches Hg, rising Visibility: 60 miles 6-hour minimum temperature: 29F 24-hour precipitation: 0 inches BHO SA 1155 CLR 60 299/33/17/3612G18/041/ WND 31V03/ 51006 10033 20029 10 A.M. Weather: Clear, cirrus layer distant SSW-W Temperature: 42F, Dew point: 15F, Wind: N at 7 kts, Wind: direction variable WNW-ENE Sea-level pressure: 30.41 inches Hg, steady Visibility: 60 miles BHO SA 1455 CLR 60 299/42/15/3507/041/ CI LYR ALG HRZN DSNT SSW-W WND 29V06/ 8/005 50000 1 P.M. Weather: Clear, cirrus layer distant SSW-WNW slowly increasing Temperature: 46F, Dew point: 13F, Wind: NNE at 8 kts, Wind: direction variability NNW-E Sea-level pressure: 30.33 inches Hg, falling Visibility: 70 miles 6-hour maximum temperature: 46F BHO SA 1755 CLR 70 270/46/13/0208/033/ CI LYR DSNT SSW-WNW INCRSNG WND 33V08/ 8/005 58029 10046 20033 WEATHER SUMMARY FOR TUESDAY, MARCH 24, 2009 TEMPERATURE (DEGREES F) MAX.....44 NORMAL.....47 MIN.....18 NORMAL.....30 MEAN....31 NORMAL.....39 DEPARTURE FROM 30-YEAR NORMAL..................-8 TOTAL DEPARTURE FOR THE MONTH.................-21 [-1.1 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............34 DEPARTURE.........+8 TOTAL HEATING UNITS FOR THE MONTH............736 DEPARTURE........+17 TOTAL HEATING UNITS FOR THE SEASON..........5263 DEPARTURE........-26 TOTAL HEATING UNITS LAST SEASON TO DATE.....4940 DIFFERENCE......+323 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............33 NW AT 7:34 A.M. AEROVANE.............37 NW AT 7:25 A.M. ASOS.................37 NNW AT 12:59 P.M. DAVIS................38 WNW AT 7:25 A.M. FASTEST MILE FOR YESTERDAY............. 25 NW AT 7:26 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........24 NNW AT 7:30 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........26 NW AT 7:29 A.M. AVERAGE............15.7 NW ASOS...............15.1 DAVIS..............15.8 NNW [330 DEGREES] 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...........2.45 DEPARTURE.........-1.26 ASOS...............2.39 TOTAL PRECIPITATION FOR THE YEAR............8.98 DEPARTURE.........-3.57 ASOS..............10.01 # # Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.........-0.3 TOTAL SNOWFALL FOR THE MONTH...............13.4 DEPARTURE.........+3.6 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+23.5 PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 3/1 28/21/25/-7/0.26/1.9/000/00 38 NNE 3/2 22/15/19/-13/1.21/8.2/000/00 40 NNE AERO 37 MPH NNE 3/3 25/11/18/-14/0.01/0.1/640/94 33 NW 3/4 30/6/18/-14/0/0/684/100 31 WNW 3/5 39/16/28/-5/0/0/659/96 25 WSW 3/6 49/30/40/+7/T/0/152/22 43 S AERO 41 MPH S 3/7 60/42/51/+18/0.06/0/429/62 37 S 3/8 57/42/50/+16/0/0/445/64 39 WNW AERO 40 MPH WNW 3/9 42/28/35/+1/0.72/3.2/000/00 33 N 3/10 42/26/34/0/0.02/0/470/67 23 SSE 3/11 50/33/42/+7/0.13/0/000/00 51 W 3/12 39/25/32/-3/0/0/685/97 44 W AERO 45 MPH W 3/13 37/19/28/-7/0/0/660/93 26 SSE 3/14 50/25/38/+2/0/0/613/86 24 SSW 3/15 59/34/47/+11/0/0/686/96 17 SSW 3/16 42/29/36/0/0/0/000/00 30 NE 3/17 47/28/38/0/+1/671/93 21 SSW 3/18 59/31/45/+8/0/0/448/62 37 SSW AERO 40 MPH S 3/19 45/36/41/+4/0.04/0/000/00 22 S 3/20 36/25/31/-7/0/0/650/89 26 NNE 3/21 43/23/33/-5/0/0/704/96 21 S 3/22 50/27/39/+1/0/0/206/28 29 NW AERO 31 MPH WNW 3/23 32/18/25/-13/0/0/694/94 38 NW 3/24 44/18/31/-8/0/0/630/85 33 NW AERO 37 MPH NW 3/25 morning low temp. 29F; normal low is now 30F NEW DAILY RECORDS FOR MARCH 2009... 3/2: DAILY SNOWFALL 8.2 INS. SURPASSES PREVIOUS RECORD OF 7.1 INS. IN 1948 3/7: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE PREVIOUSLY SET IN 1974 AND 1987 3/8: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE PREVIOUSLY SET IN 1995 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MARCH 25 HIGH 76 IN 1910 LOW 8 IN 1888, 1956 PRECIP 1.84 INS. IN 1909 SNOWFALL 1.0 INS. IN 1912 PEAK GUST 69 MPH SE IN 1969 RECORDS FOR MARCH 26 HIGH 76 IN 1922, 1949 LOW 6 IN 1960 PRECIP 1.99 INS. IN 1988 SNOWFALL 5.4 INS. IN 2001 PEAK GUST 63 MPH S IN 1970 TODAY'S REPORT PREPARED BY: Robert Skilling