BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, APRIL 3, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME EARLY APRIL STRETCH OF COLD DAMP WEATHER FOLLOWS FIVE STRAIGHT VERY DRY DAYS The light rain that began late on April 1st brought an end to tinder dry conditions that existed from March 28th through the afternoon hours of April 1st. Relative humidities dropped to between 10 and 25% on each afternoon and stayed below 35% on at least a couple of nights. The fire danger was high during this period with a red flag warning in effect on most of the days. The rainfall has totaled 3/4 inch on April 1-2 with several more hundredths falling as drizzle early on April 3rd. MARCH 2007 Av. Max. 45.4 Av. Min. 25.9 Mean temp: 35.7 [-0.6] 24-hr corr. mean: 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] Seasonal snowfall: 27.4 [-29.5] Sunshine: 12084 (corrected mins.) or 54% This is 6 points more than average. NEW MARCH DAILY RECORDS... 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. Today's observations: 7 A.M. Weather: Obscurement with fog, heavy fog, drizzle ended Temperature: 39F, Dew point: 39F, Wind: NNE at 6 kts Sea-level pressure: 30.13 inches Hg, rising Visibility: 1/8 mile 6-hour min. temp: 38F 6-hour rainfall: 0.03 in. 24-hour rainfall: 0.05 in. BHO SA 1155 W2 X 1/8F 202/39/39/0206/013/ LBE UKN VRY LGT/ 8//// 53016 MANUAL 6003/ ASOS 60000 ASOS 70002 MANUAL 70005 10039 20038 10 A.M. Weather: Obscurement with fog, heavy fog, drizzle ended Temperature: 39F, Dew point: 39F, Wind: N at 7 kts Sea-level pressure: 30.18 inches Hg, steady Visibility: 1/8 mile 3-HOUR precip: 0.01 in. BHO SA 1455 W2 X 1/8F 220/39/39/3607/018/ LE UKN/ 8//// 50018 ASOS 60001 MANUAL 6001/ 1 P.M. Weather: Low overcast stratus, and light fog Temperature: 38F, Dew point: 37F, Wind: NNE at 11G18 kts Sea-level pressure: 30.19 inches Hg, rising Visibility: 4 miles 6 hour max. temp. 41 deg. 6 hour precip: 0.01 in. BHO SA 1755 E5 OVC 4F 224/38/37/0311G18/019/ CIG/VSBY LWRG WND 36V07/ 8/6// 53004 ASOS 60001 MANUAL 6001/ 10041 20038 WEATHER SUMMARY FOR MONDAY, APRIL 2 TEMPERATURE (DEGREES F) MAX.....39 NORMAL.....50 MIN.....35 NORMAL.....33 MEAN....37 NORMAL.....42 DEPARTURE FROM 30-YEAR NORMAL..........- 5 TOTAL DEPARTURE FOR THE MONTH.......... 0 HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........28 DEPARTURE........+ 5 TOTAL HEATING UNITS FOR THE MONTH......... 47 DEPARTURE........ 0 TOTAL HEATING UNITS FOR THE SEASON.......5041 DEPARTURE.......-470 TOTAL HEATING UNITS LAST SEASON TO DATE..4968 DIFFERENCE.......+73 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............27 E AT 1:34 A.M. AEROVANE............ 24 E AT 1:34 A.M. ASOS.................28 E AT 1:34 A.M. DAVIS................24 E AT 12:55 A.M. FASTEST MILE FOR YESTERDAY..............18 E AT 1:51 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 E AT 1:53 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........19 E AT 1:53 A.M. AVERAGE WIND SPEED AND DIRECTION......10.3 E ASOS..............10.6 DAVIS............. 9.9 E [080 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05 DEPARTURE.....-0.10 ASOS..............0.02 TOTAL PRECIPITATION FOR THE MONTH..........0.78 DEPARTURE.....+0.48 ASOS..............0.71 TOTAL PRECIPITATION FOR THE YEAR..........12.52 DEPARTURE.....-1.41 ASOS.............12.35 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE......-0.3 TOTAL SNOWFALL FOR THE SEASON..............27.4 DEPARTURE.....-29.8 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/+18/0/0/412/58 # 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 # typo...sunshine % corrected to 58% from 57% 4/1 59/33/46/+5/0.42/0/511/67 30 S 4/2 39/35/37/-5/0.33/0/000/00 27 E 4/3 morning low temp. 38 deg; normal now 33 deg. precip. midnight to 7 a.m. 0.03 inch DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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] RECORDS FOR APRIL 4 HIGH 71 IN 1950 LOW 12 IN 1954 PRECIP 1.45 IN. IN 1987 SNOWFALL 3.7 IN. IN 1975 PEAK GUST 80 MPH WNW IN 1963 TODAY'S REPORT By: Robert Skilling