BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, APRIL 6, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear Temperature: 26F, Dew point: 13F, Wind: WSW at 13G20 kts Wind: Peak wind 29 kts WSW @ 6:03 A.M. Sea-level pressure: 29.70 inches Hg, rising Visibility: 45 miles 6-hour min. temp: 23F BHO SA 1155 CLR 45 057/26/13/2513G20/970/ FEW DSNT SC ALQDS XCPT N PK WND 2429/03/ 8/500 53010 10026 20023 10 A.M. Weather: Clear Temperature: 33F, Dew point: 14F, Wind: WSW at 14 kts Sea-level pressure: 29.70 inches Hg, falling Visibility: 50 miles, 75 miles NW-E BHO SA 1455 CLR 50 056/33/14/2414/970/ FEW DSNT SC VSBY NW-E 75 WND 20V28/ 8/500 58001 1 P.M. Weather: Scattered clouds Temperature: 36F, Dew point: 14F, Wind: WSW at 13 kts Wind: Peak wind 27 kts WSW @ 12:09 P.M. Sea-level pressure: 29.69 inches Hg, falling Visibility: 50 miles, 60 miles NW 6 hour max. temp. 39 deg. BHO SA 1755 50 SCT 50 055/36/14/2413/969/ VSBY NW 60 PK WND 2527/09 WND 18V27/ 8/100 58001 10039 20026 WEATHER SUMMARY FOR THURSDAY, APRIL 5 TEMPERATURE (DEGREES F) MAX.....43 NORMAL.....52 MIN.....26 NORMAL.....34 MEAN....35 NORMAL.....43 DEPARTURE FROM 30-YEAR NORMAL..........- 8 TOTAL DEPARTURE FOR THE MONTH..........- 21 [-4.4 deg.] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........30 DEPARTURE........+ 8 TOTAL HEATING UNITS FOR THE MONTH.........136 DEPARTURE........+21 TOTAL HEATING UNITS FOR THE SEASON.......5130 DEPARTURE.......-449 TOTAL HEATING UNITS LAST SEASON TO DATE..5038 DIFFERENCE.......+92 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............36 WSW AT 9:53 P.M. AEROVANE............ 35 WSW AT 9:54 P.M. ASOS.................33 WSW AT 9:54 P.M. DAVIS................37 WSW AT 9:53 P.M. FASTEST MILE FOR YESTERDAY..............26 WSW AT 2:03 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........25 WSW AT 2:15 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........27 W AT 9:54 P.M. AVERAGE WIND SPEED AND DIRECTION......16.5 W ASOS..............17.0 DAVIS.............16.3 WNW [287 deg] * last of several occurrences.. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace DEPARTURE.....-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.90 DEPARTURE.....+1.15 ASOS..............1.79 TOTAL PRECIPITATION FOR THE YEAR..........13.64 DEPARTURE.....-0.74 ASOS.............13.43 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M........trace DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE MONTH................0.2 DEPARTURE......-0.4 TOTAL SNOWFALL FOR THE SEASON..............27.6 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 36/32/34/-8/0.90/0.2/000/00 38 E 4/5 43/26/35/-8/0.21/T/.../.. 36 WSW 4/6 morning low temp. 23 deg; normal now 34 deg. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 6 HIGH 82 IN 1921 LOW 16 IN 1982 PRECIP 1.72 INS IN 1886 SNOWFALL 12.3 INS IN 1982 WIND 71e MPH WNW IN 1940 RECORDS FOR APRIL 7 HIGH 86 IN 1929 LOW 13 IN 1982 PRECIP 1.72 IN. IN 1924 SNOWFALL 4.5 IN. IN 1967, 1996 PEAK GUST 65 MPH WNW IN 1982 TODAY'S REPORT By: Stephanie Radner