BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, APRIL 5, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Obscurement, light snow and fog Temperature: 31F, Dew point: 30F, Wind: W at 13 kts Sea-level pressure: 29.54 inches Hg, rising Visibility: 1/4 mile, variable 1/4-2 miles 6-hour min. temp: 31F 6-hour precip: 0.10 in. 24-hour precip: 1.11 in. 24-hour snowfall: 0.2 in. BHO SA 1155 W3 X 1/4VS-F 005/31/30/2813/954/ VSBY 1/4V2 TOTAL NEW SNW PST 24 HRS 0.2 INS SB50/ 8//// 53008 MANUAL 6010/ ASOS 60011 MANUAL 70111 ASOS 70107 10034 20031 10 A.M. Weather: Low overcast Temperature: 33F, Dew point: 31F, Wind: WNW at 12 kts Sea-level pressure: 29.57 inches Hg, rising Visibility: 30 miles 3-hour precip: trace BHO SA 1455 E8 OVC 30 014/33/31/2912/957/ 8/5// 51009 MANUAL 6000/ 1 P.M. Weather: Low broken clouds Temperature: 41F, Dew point: 29F, Wind: W at 18G29 kts Wind: Peak wind 29 kts W @ 12:49 P.M. Sea-level pressure: 29.55 inches Hg, falling Visibility: 50 miles 6 hour max. temp. 41 deg. 6 hour precip: trace BHO SA 1755 MANUAL E30 BKN 40 BKN 50 007/41/29/2618G29/955/ PK WND 2629/49/ 8/500 56007 MANUAL 6000/ 10041 20030 WEATHER SUMMARY FOR WEDNESDAY, APRIL 4 TEMPERATURE (DEGREES F) MAX.....36 NORMAL.....51 MIN.....32 NORMAL.....33 MEAN....34 NORMAL.....42 DEPARTURE FROM 30-YEAR NORMAL..........- 8 TOTAL DEPARTURE FOR THE MONTH..........- 13 [-3.5 deg.] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........31 DEPARTURE........+ 8 TOTAL HEATING UNITS FOR THE MONTH.........106 DEPARTURE........+13 TOTAL HEATING UNITS FOR THE SEASON.......5100 DEPARTURE.......-457 TOTAL HEATING UNITS LAST SEASON TO DATE..5007 DIFFERENCE.......+93 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............38 E AT 4:52 P.M. AEROVANE............ 37 E AT 4:51 P.M. ASOS.................38 E AT 4:52 P.M. DAVIS................37 E AT 4:51 P.M. FASTEST MILE FOR YESTERDAY..............27 E AT 4:36 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........30 E AT 4:37 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........27 E AT 4:37 P.M. AVERAGE WIND SPEED AND DIRECTION......14.6 E ASOS..............15.1 DAVIS.............14.7 E [085 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.11 DEPARTURE.....+0.96 ASOS..............1.07 TOTAL PRECIPITATION FOR THE MONTH..........1.90 DEPARTURE.....+1.30 ASOS..............1.79 TOTAL PRECIPITATION FOR THE YEAR..........13.64 DEPARTURE.....-0.59 ASOS.............13.43 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.2 DEPARTURE......+0.1 TOTAL SNOWFALL FOR THE MONTH................0.2 DEPARTURE......-0.3 TOTAL SNOWFALL FOR THE SEASON..............27.6 DEPARTURE.....-29.8 PRELIMINARY CLIMATE SUMMARY FOR APRIL 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 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 41/32/37/-5/0.04/0/000/00 28 ENE 4/4 36/32/34/-8/0.90/0.2/000/00 38 E 4/5 morning low temp. 30 deg; normal now 34 deg. precip midnight to 7 a.m. 0.21 ins. snowfall midnight to 7 a.m. trace DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 5 HIGH 81 IN 1928 LOW 15 IN 1995 PRECIP 2.15 IN. IN 1987 SNOWFALL 4.0 IN. IN 1898 PEAK GUST 76 MPH WNW IN 1963 RECORDS FOR APRIL 6 HIGH 82 IN 1921 LOW 16 IN 1982 PRE 1.72 INS IN 1886 SNOW 12.3 INS IN 1982 WIND 71e MPH WNW IN 1940 TODAY'S REPORT By: Stephanie Radner