BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, APRIL 1, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME THE MARCH 2009 STATS Temps. Deg. F Av. Max. 44.5 Av. Min. 27.5 Mean 36.0 [-0.3] 24-hour corr. mean 35.2 Max. temp: 60/7th Min. temp: 6/4th Total heating units: 891 [-3] Seasonal total: 5418 [-46] Total precip. 3.55 ins. [-1.24] Greatest in 24 hours: 1.41 ins. [1st-2nd] Total snowfall: 13.4 ins. [+1.9] Greatest in 24 hours: not currently available Sunshine [astronomical]: 210.7 hours or 57% Sunshine [uncorrected]: 203.6 hours or 57% Av. wind speed [uncorrected]: 12.9 MPH Av. wind speed [corrected]: 13.2 MPH Prevailing direction: WNW @ 13% Peak gust: 51 MPH W on the 11th Aerovane: 52 MPH W on the 11th Thunderstorm days: 1 3RD SUNNIEST JANUARY THRU MARCH The combined sunshine total for the first three months of 2009 is the third greatest on our entire record. All three months have had well above average sunshine with an average of 59% of the possible. The combined total hours for the sunniest first three months of any year on record are: (uncorrected card minutes) 1. 559.7 in 1978 2. 548.4 in 1964 3. 548.2 in 2009 Today's observations: 7 A.M. Weather: Broken stratocumulus, overcast high cirrus and cirrostratus clouds, overcast partly thin Temperature: 34F, Dew point: 32F, Wind: ESE at 10 kts Sea-level pressure: 30.30 inches Hg, rising Visibility: 12 miles, thin fog, inversion present 6-hour minimum temperature: 31F 24-hour precipitation: 0.00 inch BHO SA 1155 E18 BKN 250 BKN 300 OVC 12 261/34/32/1210/030/ OVC PTLY THN THN FG ALQDS INVSN/ 8/507 50014 10035 20031 10 A.M. Weather: Broken stratocumulus variable to overcast, high overcast of dense cirrostratus, sun dimly visible Temperature: 41F, Dew point: 31F, Wind: SE at 8 kts, Wind: direction variability east to south Sea-level pressure: 30.27 inches Hg, falling Visibility: 20 miles, hazy BHO SA 1455 E17 BKN 200 OVC 20 259/41/31/1308/027/ 17 BKN V OVC SUN DMLY VSB HAZY WND 10V17/ 8/507 56002 1 P.M. Weather: Broken stratocumulus, broken altocumulus, overcast cirrostratus, thin spots in overcast, sun disc visible Temperature: 45F, Dew point: 32F, Wind: NE at 12 kts Wind: direction variable east to south Sea-level pressure: 30.24 inches Hg, falling Visibility: 20 miles, hazy 6-hour maximum temperature: 45F BHO SA 1755 E25 BKN 110 BKN 180 OVC 20 239/45/32/1312/024/ THN SPTS IOVC SUN DSC VSB HAZY WND 10V18/ 8/537 58020 10045 20034 WEATHER SUMMARY FOR TUESDAY, MARCH 31, 2009 TEMPERATURE (DEGREES F) MAX.....51 NORMAL.....50 MIN.....35 NORMAL.....32 MEAN....43 NORMAL.....41 DEPARTURE FROM 30-YEAR NORMAL..................+2 TOTAL DEPARTURE FOR THE MONTH..................-1 [-0.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............22 DEPARTURE.........-2 TOTAL HEATING UNITS FOR THE MONTH............891 DEPARTURE.........-3 TOTAL HEATING UNITS FOR THE SEASON..........5418 DEPARTURE........-46 TOTAL HEATING UNITS LAST SEASON TO DATE.....5137 DIFFERENCE......+281 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............29 W AT 1:03 A.M. AEROVANE.............25 W AT 1:03 A.M. ASOS.................25 WNW AT 2:22 A.M. DAVIS................26 W AT 1:03 A.M. FASTEST MILE FOR YESTERDAY..............20 W AT 1:03 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 W AT 1:04 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........19 WNW AT 3-4 A.M. * AVERAGE............11.4 ASOS...............11.3 DAVIS..............12.1 NNW [330 DEGREES] * last of several occurrences..& times to nearest minute not available 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...........3.55 DEPARTURE.........-1.24 ASOS...............3.51 TOTAL PRECIPITATION FOR THE YEAR...........10.08 DEPARTURE.........-3.55 ASOS..............11.13 # # 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.........-0.2 TOTAL SNOWFALL FOR THE MONTH...............13.4 DEPARTURE.........+1.9 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+21.8 PRELIMINARY CLIMATE SUMMARY FOR MARCH-APRIL 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 49/29/39/0/0/0/670/90 25 N 3/26 53/33/43/+4/0.25/0/298/40 23 SE 3/27 57/36/47/+7/0.10/0/353/47 22 S 3/28 58/39/49/+9/0/0/459/61 22 S 3/29 42/37/40/0/0.57/0/000/00 38 NE TSTM 3/30 42/36/39/-2/0.18/0/000/00 40 WNW 3/31 51/35/43/+2/0/0/738/97 30 W 4/1 morning low temp: 31F; our normal low is now 33F 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 APRIL 1 HIGH 74 IN 1967 LOW 6 IN 1923 [RECORD FOR MONTH] PRECIP 3.47 IN. IN 2004 [RECORD FOR MONTH] SNOWFALL 15.0 IN. IN 1997 [RECORD FOR MONTH] PEAK GUST 75 MPH SSW IN 1962 RECORDS FOR APRIL 2 HIGH 77 IN 1967 LOW 14 IN 1919 PRECIP 1.83 IN. IN 1970 SNOWFALL 13.0 IN. IN 1887 PEAK GUST 76 MPH SSW IN 1970 TODAY'S REPORT PREPARED BY: Robert Skilling/Stephanie Radner