BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, APRIL 8, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME NEW RECORD HIGH TEMPERATURE OF 90F FOR APRIL 7 NEW EARLIEST OCCURRENCE OF 90F The high temperature reached 90F Wednesday afternoon, setting a new record for April 7, surpassing the previous record of 86F which occurred in 1929. This also marks the earliest occurrence of 90F on record, surpassing the previous earliest 90F of 93F on April 17, 2002. April temperatures continue to run far above normal, with an average daily departure of over 17 degrees for the first 7 days of April. Today's observations: 7 A.M. Weather: Scattered cirrus, patches of dense cirrus, thin fog/haze Temperature: 55F, Dew point: 50F, Wind: ENE at 12 kts Wind: Variable direction north to east Sea-level pressure: 29.81 inches Hg, rising Visibility: 10 mile, fog/haze 6-hour minimum temp: 52F BHO SA 1155 250 SCT 10 094/55/50/0612/981/ THN LINE SC NW-NE PTCHS DENS CI W-NE THN F/HZ WND 01V10/ 8/502 51020 10064 20052 10 A.M. Weather: Broken cirrostratus and cirrus, few distant cumulus north-northeast thru east, partial halo, hazy Temperature: 59F, Dew point: 48F, Wind: NNE at 9 kts Wind: Direction variable NNW to ENE Sea-level pressure: 29.81 inches Hg, rising slightly Visibility: 15 miles, hazy BHO SA 1455 E220 BKN 250 BKN 15 095/59/48/0309/981/ FEW DSNT CU NNE-E PARTIAL HALO HAZY WND 33V06/ 8/107 52001 1 P.M. Weather: Scattered stratocumulus, broken cirrus, few cumulus drifting overhead, hazy Temperature: 57F, Dew point: 45F, Wind: NE at 13G19 kts, Wind: Direction variable N to E Sea-level pressure: 29.78 inches Hg, falling Visibility: 25 miles, hazy 6-hour maximum temp: 63F BHO SA 1755 20 SCT E250 BKN 25 086/57/45/0413G19/978/ SC W-ESE FEW CU DRFTNG OVHD HAZY WND 36V09/ 8/801 58009 10063 20055 WEATHER SUMMARY FOR WEDNESDAY, APRIL 7 TEMPERATURE (DEGREES F) MAX.....90 NORMAL.....52 MIN.....45 NORMAL.....34 MEAN....68 NORMAL.....43 DEPARTURE FROM 30-YEAR AVERAGE..............+25 TOTAL DEPARTURE FOR THE MONTH..............+123 (+17.4 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE.......-22 TOTAL HEATING UNITS FOR THE MONTH............39 DEPARTURE......-120 TOTAL HEATING UNITS FOR THE SEASON.........5135 DEPARTURE......-488 TOTAL HEATING UNITS LAST SEASON TO DATE....5555 DIFFERENCE.....-420 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............36 WSW AT 4:37 P.M. AEROVANE..............41 WSW AT 4:37 P.M. ASOS..................37 W AT 4:38 P.M. DAVIS.................36 WSW AT 3:18 P.M. THE FASTEST MILE FOR YESTERDAY...........26 WSW AT 4:34 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............24 W AT 4:36 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........25 WSW AT 3:40 P.M. AVERAGE WIND SPEED AND DIRECTION..........12.8 SSW ASOS...................12.0 DAVIS..................12.2 SW [231 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.........trace DEPARTURE......-1.05 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR..........27.91 DEPARTURE.....+13.23 ASOS.............28.10 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE......-0.8 TOTAL SNOWFALL FOR THE SEASON..............64.4 DEPARTURE......+6.7 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2010 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 4/1 59/43/51/+10/T/0/359/47 24 NNW AERO 30 MPH NNW 4/2 67/46/57/+15/0.00/0/728/95 21 SSE 4/3 75/45/60/+18/0.00/0/731/95 26 SSE 4/4 76/45/61/+19/0.00/0/617/80 27 W AERO 29 MPH W 4/5 72/53/63/+20/0.00/0/635/82 37 SSE AERO 40 MPH SSE 4/6 68/50/59/+16/T/0/202/26 23 W AERO 25 MPH W 4/7 90/45/68/+25/0.00/0/.../.. 36 WSW AERO 41 MPH WSW 4/8 our morning low temp: 52F; the normal low is now 35F NEW DAILY RECORDS FOR APRIL 2010 4/4 - new record high maximum temperature of 76F; surpasses 71F in 1950. 4/5 - new record high minimum temperature of 53F; surpasses 52F in 1981 4/7 - new record high maximum temperature of 90F; surpasses 86F in 1929 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 8 HIGH 87 IN 1991 LOW 17 IN 1888 PRECIP 1.78 IN. IN 1956 SNOWFALL 9.3 IN. IN 1956 PEAK GUST 70 MPH S IN 2000 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 TODAY'S REPORT PREPARED BY: Sean Fankhauser/Stephanie Radner