BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, APRIL 2, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME MARCH 2007 Av. Max. 45.4 Av. Min. 25.9 Mean temp: 35.7 [-0.6] 24-hr corr. mean temp: 35.2 Max. 66/14th Min. 1/9th HDD = 903 [+ 9] CDD = 0 [- 1] Av. corr. wind speed: 16.2 Prevailing wind direction: W 18% Peak wind: 58 MPH W [5th] Total precip: 6.02 [+1.23] Greatest in 24 hours: 3.17 ins. [16-17] Total snowfall: 13.5 [+2.0] Greatest in 24 hours: 8.5 ins. [16-17] Seasonal snowfall: 27.4 [-29.5] Sunshine: 12084 (corrected mins.) or 54% This is 6 points more than average. Av. vapor pressure: 4.5 mbs. Today's observations: 7 A.M. Weather: Obscurement with fog, very light drizzle and heavy fog Temperature: 36F, Dew point: 36F, Wind: E at 09 kts Sea-level pressure: 30.01 inches Hg, steady Visibility: 1/8 mile 6-hour min. temp: 35F 6-hour rainfall: 0.15 in. 24-hour rainfall: 0.73 in. BHO SA 1155 W2 X 1/8L-F 161/36/36/0809/001/ PCPN VRY LGT/ 8//// 55006 ASOS 60013 MANUAL 6015/ ASOS 70069 MANUAL 70073 10036 20035 10 A.M. Weather: Low overcast stratus light drizzle and fog Temperature: 38F, Dew point: 38F, Wind: E at 10 kts Sea-level pressure: 29.99 inches Hg, steady Visibility: 1 mile BHO SA 1455 E3 OVC 1L-F 165/38/38/0910/999/ THN STRA DRFTG OVR SMT/ 51004 8/6// ASOS 60001 MANUAL 6001/ 1 P.M. Weather: Low overcast stratus, and light fog Temperature: 39F, Dew point: 39F, Wind: ENE at 10 kts Sea-level pressure: 29.99 inches Hg, steady Visibility: 4 miles 6 hour max. temp. 39 deg. 6 hour precip: 0.01 in. BHO SA 1755 E5 OVC 4F 155/39/39/0610/999/ LE UKN/ 8/6// 56010 AS0S 60001 MANUAL 6001/ 10039 20036 WEATHER SUMMARY FOR SUNDAY, APRIL 1 TEMPERATURE (DEGREES F) MAX.....59 NORMAL.....50 MIN.....33 NORMAL.....33 MEAN....46 NORMAL.....41 DEPARTURE FROM 30-YEAR NORMAL..........+ 5 TOTAL DEPARTURE FOR THE MONTH..........+ 5 HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........19 DEPARTURE........- 5 TOTAL HEATING UNITS FOR THE MONTH......... 19 DEPARTURE........- 5 TOTAL HEATING UNITS FOR THE SEASON.......5013 DEPARTURE.......-475 TOTAL HEATING UNITS LAST SEASON TO DATE..4955 DIFFERENCE.......+58 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............30 S AT 6:35 P.M. AEROVANE............ 27 S AT 6:35 P.M. ASOS.................29 S AT 6:34 P.M. DAVIS................28 S AT 4:30 P.M. FASTEST MILE FOR YESTERDAY..............23 S AT 6:34 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........23 S AT 6:41 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........20 S AT 4:33 P.M. AVERAGE WIND SPEED AND DIRECTION...... 9.6 S ASOS.............. 9.9 DAVIS..............9.2 S [190 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.73 DEPARTURE.....+0.58 ASOS..............0.69 TOTAL PRECIPITATION FOR THE MONTH..........0.73 DEPARTURE.....+0.58 ASOS..............0.69 TOTAL PRECIPITATION FOR THE YEAR..........12.47 DEPARTURE.....-1.31 ASOS.............12.33 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE......-0.2 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE......-0.2 TOTAL SNOWFALL FOR THE SEASON..............27.4 DEPARTURE.....-29.7 PRELIMINARY CLIMATE SUMMARY FOR MARCH 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 3/1 40/22/31/-1/0/0/512/76 24 NW Aero 23 MPH NW 3/2 49/28/39/+7/1.74/0.4/000/00 48 E Aero 45 MPH E 3/3 58/33/46/+14/0/0/489/72 44 WNW Aero 43 MPH WNW 3/4 40/26/33/0/0/0/471/69 37 W 3/5 37/19/28/-5/T/T/198/29 58 W Aero 57 MPH W 3/6 19/3/11/-22/0/0/667/97 * 57 W Aero 61 MPH W 3/7 22/2/12/-21/0/0/504/73 28 SW 3/8 25/5/15/-19/T/T/471/68 51 WNW Aero 54 MPH WNW 3/9 34/1/18/-16/0/0/668/96 * 25 S 3/10 49/22/36/+2/0/0/322/46 39 S Aero 39 MPH S 3/11 51/33/42/+7/0.26/0/513/73 32 W 3/12 55/31/43/+8/0/0/423/60 24 SSW 3/13 60/36/48/+13/0/0/312/44 35 S Aero 33 MPH S 3/14 66/42/54/+18/0/0/412/57 36 S 3/15 54/35/45/+9/0.07/0/000/00 36 NW 3/16 35/24/30/-6/1.65/8.5/000/00 55 NE Aero 53 MPH NE 3/17 34/24/29/-6/1.52/T/000/00 51 NNE Aero 50 MPH NE 3/18 31/20/26/-11/0/0/318/44 43 W Aero 42 MPH W 3/19 40/22/31/-6/0.18/1.0/435/60 38 S Aero 37 MPH S 3/20 42/21/32/-6/0/0/677/93 46 WSW Aero 47 MPH W 3/21 36/16/26/-12/0/0/702/96 33 S 3/22 52/31/42/+4/T/0/132/18 47 S Aero 50 MPH S 3/23 57/41/49/+11/T/0/258/35 35 W 3/24 50/31/41/+2/0.40/3.5/585/79 28 E Aero 23 MPH E 3/25 45/32/39/0/0.01/0.1/126/17 16 WSW 3/26 45/34/40/+1/0.17/0/022/03 37 S 3/27 61/41/51/+11/0.02/0/239/32 24 WNW 3/28 54/36/45/+5/0/0/706/94 46 WNW Aero 48 MPH WNW 3/29 50/28/39/-1/0/0/739/98 46 NW 3/30 61/32/47/+6/0/0/507/67 37 W 3/31 54/33/44/+3/0/0/676/89 28 WNW 4/1 59/33/46/+5/0.42/0/... 30 S 4/2 morning low temp. 35 deg; rainfall: 0.31 inch * Record low maximum temperature of 19 on the 6th surpasses previous 21 set in 1916. * Record low minimum temperature of 3 on the 6th ties previous 3 set in 1948. * Record low minimum temperature of 1 on the 9th breaks previous 5 set in 1885, 1943, and 1996. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 2 HIGH 77 IN 1967 LOW 14 IN 1919 PRECIP 1.83 INCHES IN 1970 SNOWFALL 13.0 INCHES IN 1887 PEAK GUST 76 MPH SSW IN 1970 RECORDS FOR APRIL 3 HIGH 76 IN 1892 LOW 16 IN 1894 PRECIP 2.18 IN. IN 1990 SNOWFALL 8.0 IN. IN 1915 PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH] TODAY'S REPORT By: Robert Skilling/Stephanie Radner