BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, APRIL 9, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME MODERATING TEMPERATURES TODAY UNDER SUNNY SKIES EASTER SUNDAY WAS PARTLY TO MOSTLY SUNNY, COLD AND WINDY FIRST 8 DAYS OF APRIL MUCH COLDER THAN EARLY JANUARY A moderating trend away from the much below normal temperatures of the past several days is taking place today under sunny skies. The morning low temperature was 5 degrees less cold than yesterday morning but still 5 degrees colder than normal. By early this afternoon our high temperature had already reached the upper 40's, the warmest it's been since 59 degrees on April 1st. Easter Sunday was cold and windy but with a bit more sunshine than expected at 79%. The day was 11 degrees colder than normal with an afternoon high of only 40 degrees; normal is now 53. Peak wind gusts reached 44 MPH from the west. The first 8 days of April have averaged 7 degrees colder than normal at 35.6 as compared to the average of 45.4 degrees for the first 8 days of January which averaged 18.8 degrees warmer than normal. Today's observations: 7 A.M. Weather: Clear, cirrus WNW-E Temperature: 34F, Dew point: 21F, Wind: W at 22G29 kts Wind: Peak wind 26 kts from W at 54 past the hour Sea-level pressure: 29.84 inches Hg, rising Visibility: 55 miles 6-hour min. temp: 30F BHO SA 1155 CLR 55 105/34/21/2622G29/984/ SC DSNT W CI WNW-E AND DENSE CI LYR DSNT NW-NE PK WND 2629/54/ 8/502 53015 10034 20030 10 A.M. Weather: Thin scattered cirrus Temperature: 43F, Dew point: 20F, Wind: W at 16G26 kts Peak wind: 29 kts W at 31 mins. past the hour Sea-level pressure: 29.85 inches of Hg, rising Visibility: 70 miles BHO SA 1455 250 –SCT 70 107/43/20/2616G27/985/ SC DSNT W-N-NE PK WND 2629/31/ 8/501 53002 1 P.M. Weather: Clear, few cumulus and cirrus Temperature: 49F, Dew point: 20F, Wind: W at 12G26 kts Peak wind: 26 kts W at 49 mins. past the hour Sea-level pressure: 29.82 inches of Hg, falling Visibility: 80 miles 6-hour max. temp. 49 deg. WEATHER SUMMARY FOR SUNDAY, APRIL 8, EASTER SUNDAY TEMPERATURE (DEGREES F) MAX.....40 NORMAL.....53 MIN.....25 NORMAL.....35 MEAN....33 NORMAL.....44 DEPARTURE FROM 30-YEAR NORMAL..........-11 TOTAL DEPARTURE FOR THE MONTH..........-54 (-7.0 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........32 DEPARTURE........+11 TOTAL HEATING UNITS FOR THE MONTH.........234 DEPARTURE........+54 TOTAL HEATING UNITS FOR THE SEASON.......5228 DEPARTURE.......-416 TOTAL HEATING UNITS LAST SEASON TO DATE..5103 DIFFERENCE......+125 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............44 W AT 4:27 P.M. AEROVANE............ 42 W AT 4:27 P.M. ASOS.................41 WSW AT 5:34 P.M. DAVIS................44 WSW AT 4:26 P.M. FASTEST MILE FOR YESTERDAY..............32 WSW AT 3:06 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........32 WSW AT 3:06 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........34 WSW AT 3:06 P.M. AVERAGE WIND SPEED AND DIRECTION......19.2 WSW ASOS..............19.0 DAVIS.............19.1 W [260 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..........1.90 DEPARTURE.....+0.70 ASOS..............1.79 TOTAL PRECIPITATION FOR THE YEAR..........13.64 DEPARTURE.....-1.19 ASOS.............13.43 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......-0.7 TOTAL SNOWFALL FOR THE SEASON..............27.6 DEPARTURE.....-30.2 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/.../.. 36 WSW 4/7 40/26/33/-10/0/0/.../.. 35 W 4/8 40/25/33/-11/0/0/619/79 44 W 4/9 morning low temp. 30 deg; normal low 35 deg. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 9 HIGH 83 IN 1991 LOW 18 IN 1888 PRECIP 2.38 IN. IN 1935 SNOWFALL 11.0 IN. IN 1917 PEAK GUST 72 MPH WNW IN 1962 RECORDS FOR APRIL 10 HIGH 83 IN 1922 LOW 20 IN 1985 PRECIP 2.40 IN. IN 1935 SNOWFALL 10.1 IN. IN 1996 PEAK GUST 66 MPH WNW IN 1967 TODAY'S REPORT By: Robert Skilling