BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, MARCH 22, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast Temperature: 31F, Dew point: 23F, Wind: WNW at 9 kt Sea-level pressure: 30.30 inches Hg, falling Visibility: 40 miles 6-hour minimum temperature: 29F 24-hour precipitation: 0 inches BHO SA 1155 70 SCT 120 OVC 40 260/31/23/2909/030/ VIRGA W-N FEW BINOVC SE/ 8/57/ 56006 10031 20029 10 A.M. Weather: Overcast Temperature: 39F, Dew point: 20F, Wind: Light and Variable Sea-level pressure: 30.26 inches Hg, falling Visibility: 30 miles, hazy BHO SA 1455 50 SCT 100 OVC 30 247/39/20/2406/026/ FEW BINOVC ALQDS VIRGA SE VSBY E-SE 15 HAZY WND L/V/ 8/57 58013 1 P.M. Weather: Overcast Temperature: 48F, Dew point: 23F, Wind: WSW at 14G20 kt Sea-level pressure: 30.16 inches Hg, falling Visibility: 35 miles 6-hour maximum temperature: F BHO SA 1755 50 OVC 35 214/48/23/2514G20/016/ FEW BINOVC ALQDS WND 21V30/ 8/4// 58033 10049 20031 WEATHER SUMMARY FOR SATURDAY, MARCH 21, 2009 TEMPERATURE (DEGREES F) MAX.....43 NORMAL.....46 MIN.....23 NORMAL.....29 MEAN....33 NORMAL.....38 DEPARTURE FROM 30-YEAR NORMAL..................-5 TOTAL DEPARTURE FOR THE MONTH..................-1 [-0.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............32 DEPARTURE.........+5 TOTAL HEATING UNITS FOR THE MONTH............636 DEPARTURE.........-3 TOTAL HEATING UNITS FOR THE SEASON..........5163 DEPARTURE........-46 TOTAL HEATING UNITS LAST SEASON TO DATE.....4849 DIFFERENCE......+314 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............21 S AT 8:15 P.M. AEROVANE.............23 S AT 8:13 P.M. ASOS.................22 S AT 9:20 P.M. DAVIS................23 SSE AT 8:11 P.M. FASTEST MILE FOR YESTERDAY..............18 S AT 8:12 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........16 S AT 9:22 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........18 ESE AT 6:56 P.M. AVERAGE.............9.2 NW ASOS................8.7 DAVIS...............8.6 NNE [19 DEGREES] * last of several occurrences 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.........-0.78 ASOS...............2.39 TOTAL PRECIPITATION FOR THE YEAR............8.98 DEPARTURE.........-3.09 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.........+4.5 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+24.4 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/.../.. 26 NNE 3/21 43/23/33/-5/0/0/.../.. 21 S 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 22 HIGH 71 IN 1948 LOW 3 IN 1885 PRE 3.48 INS. IN 2001 SNOW 8.7 INS. 1967 WIND 84e MPH E IN 1977 RECORDS FOR MARCH 23 HIGH 78 IN 1938 LOW 3 IN 1934 PRE 1.58 INS. IN 1903 SNOW 3.0 INS. IN 1977 WIND 78e MPH W IN 1940 TODAY'S REPORT PREPARED BY: Andrew Hoell