BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, APRIL 15, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast with light rain Temperature: 38F, Dew point: 33F, Wind: E at 14G18 kt Sea-level pressure: 30.00 inches Hg, steady Visibility: 4 miles 6-hour min. 38F Precipitation: Trace BHO SA 1155 30 OVC 4R-F 159/38/33/1014G18/000/ RB25/ 8/4// 53002 6000/ 70000 10041 20038 10 A.M. Weather: Rain mixed with snow, fog Temperature: 35F, Dew point: 34F, Wind: E at 18G22 kt Sea-level pressure: 29.95 inches Hg, falling Visibility: 2 miles Precipitatin since 7AM: 0.18 inches BHO SA 1455 20 OVC 2RSF 144/35/34/1018G22/995/ 8/4// 58015 ASOS 60018 WEATHER SUMMARY FOR SATURDAY, APRIL 14 TEMPERATURE (DEGREES F) MAX.....52 NORMAL.....55 MIN.....35 NORMAL.....37 MEAN....44 NORMAL.....46 DEPARTURE FROM 30-YEAR NORMAL...........-2 TOTAL DEPARTURE FOR THE MONTH..........-87 (-6.0 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........21 DEPARTURE.........+2 TOTAL HEATING UNITS FOR THE MONTH.........388 DEPARTURE........+87 TOTAL HEATING UNITS FOR THE SEASON.......5382 DEPARTURE.......-383 TOTAL HEATING UNITS LAST SEASON TO DATE..5181 DIFFERENCE......+201 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............37 W AT 7:40 A.M. AEROVANE.............36 W AT 7:38 A.M. ASOS.................33 W AT 7:41 A.M. DAVIS................37 W FASTEST MILE FOR YESTERDAY..............27 W AT 7:40 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........28 W AT 7:41 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........30 W AVERAGE WIND SPEED AND DIRECTION......13.5 WNW ASOS..............14.1 DAVIS.............14.5 W [279 deg] 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..........2.79 DEPARTURE.....+0.69 ASOS..............2.66 TOTAL PRECIPITATION FOR THE YEAR..........14.53 DEPARTURE.....-1.20 ASOS.............14.30 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE MONTH................0.2 DEPARTURE......-1.3 TOTAL SNOWFALL FOR THE SEASON..............27.6 DEPARTURE.....-30.8 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 43/26/35/-8/0.21/T/163/21 36 WSW 4/6 39/23/31/-12/0/0/590/76 36 WSW 4/7 40/26/33/-10/0/0/405/52 35 W 4/8 40/25/33/-11/0/0/619/79 44 W Aero 42 MPH W 4/9 50/30/40/-4/0/0/746/95 36 W 4/10 43/30/37/-7/0/0/158/20 28 W 4/11 51/28/40/-5/0/0/.../.. 22 SSE 4/12 39/32/36/-9/0.89/T/000/00 42 E Aero 40 MPH E 4/13 47/31/39/-6/0/0/.../.. 41 W Aero 42 MPH W 4/14 52/35/44/-2/0/0/.../.. 37 W 4/15 MORNING LOW 38F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 15 HIGH 81 IN 1896 LOW 23 IN 1943 PRECIP 1.29 INCHES IN 1990 SNOWFALL 1.0 INCHES IN 1916, 1962 PEAK GUST 59e MPH S IN 1946, 1980 RECORDS FOR APRIL 16 HIGH 87 IN 1896 LOW 23 IN 1943 PRECIP 2.45 INCHES IN 1929 SNOWFALL 2.0 INCHES IN 1904, 1962 PEAK GUST 63 MPH SSE IN 1996 TODAY'S REPORT By: Andrew Hoell