BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, APRIL 4, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Low overcast cool and damp weather continues today. A very light early morning snow flurry was observed around 8 a.m. After a morning low temperature of 32 degrees the mercury had only edged up to 36 degrees by early afternoon. Today's observations: 7 A.M. Weather: Overcast with very light snow shower and thin fog Temperature: 34F, Dew point: 30F, Wind: E at 12 kts Sea-level pressure: 30.12 inches Hg, falling Visibility: 9 miles, S 10, SW 15 6-hour min. temp: 33F 6-hour precip: trace 24-hour precip: 0.01 in. 24-hour snowfall: trace BHO SA 1155 E15 BKN 85 OVC 9SW- 198/34/30/0812/012/ THN F ALQDS VSBY S 10 SW 15 SBUKN PCPN VRY LGT/ 8/52/ 58002 MANUAL 6000/ MANUAL 70001 ASOS 70001 10034 20033 10 A.M. Weather: Low overcast stratus, hazy Temperature: 36F, Dew point: 31F, Wind: E at 13G26 kts Sea-level pressure: 30.04 inches Hg, falling Visibility: 15 miles 3-HOUR precip: trace BHO SA 1455 E14 OVC 15 172/36/31/0913G26/004/ PK WND 0926/45/ HAZY/ 8/6// 58026 MANUAL 6000/ 1 P.M. Weather: Low overcast stratus, and light fog Temperature: 36F, Dew point: 32F, Wind: E at 11G17 kts Sea-level pressure: 29.97 inches Hg, falling Visibility: 12 miles 6 hour max. temp. 36 deg. 6 hour precip: trace BHO SA 1755 E12 OVC 12 149/36/32/0911G17/997/ THN F VSBY SLWLY LWRG THN F/ 8/6// 58023 MANUAL 6000/ 10036 20034 WEATHER SUMMARY FOR TUESDAY, APRIL 3 TEMPERATURE (DEGREES F) MAX.....41 NORMAL.....51 MIN.....32 NORMAL.....33 MEAN....37 NORMAL.....42 DEPARTURE FROM 30-YEAR NORMAL..........- 5 TOTAL DEPARTURE FOR THE MONTH..........- 5 [-1.9 deg.] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........28 DEPARTURE........+ 5 TOTAL HEATING UNITS FOR THE MONTH......... 75 DEPARTURE........+ 5 TOTAL HEATING UNITS FOR THE SEASON.......5069 DEPARTURE.......-465 TOTAL HEATING UNITS LAST SEASON TO DATE..4983 DIFFERENCE.......+86 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............28 ENE AT 8:50 P.M. * AEROVANE............ 25 ENE AT 8:50 P.M. ASOS.................28 NE AT 4:04 P.M. DAVIS................27 NE AT 3:03 P.M. FASTEST MILE FOR YESTERDAY..............20 NE AT 6:49 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 NE AT 6:50 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........19 NE AT 6:49 P.M. AVERAGE WIND SPEED AND DIRECTION...... 9.7 NE ASOS..............10.0 DAVIS............. 9.1 NE [040 deg] * last of several occurrences.... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01 DEPARTURE.....-0.14 ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........0.79 DEPARTURE.....+0.34 ASOS..............0.72 TOTAL PRECIPITATION FOR THE YEAR..........12.53 DEPARTURE.....-1.55 ASOS.............12.36 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M........trace DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE MONTH..............trace DEPARTURE......-0.4 TOTAL SNOWFALL FOR THE SEASON..............27.4 DEPARTURE.....-29.9 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 morning low temp. 32 deg; normal now 33 deg. precip. & snowfall midnight to 7 a.m. are both traces DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 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 TODAY'S REPORT By: Robert Skilling