BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, APRIL 11, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME WARMEST TEMPERATURE SINCE NOVEMBER YESTERDAY RAINFALL AMOUNTS TO JUST OVER ONE THIRD INCH AND TEMPERATURES FALL INTO THE 30'S TODAY The maximum temperature of 65.0 which occurred at 2:20 p.m. EDT yesterday afternoon was our warmest reading so far this year and also was the highest since 67F last November 15th. Mostly light rainfall overnight totaled 0.36 inch and has accompanied a change to much colder temperatures. The rain began late yesterday afternoon changed to some light drizzle in the early hours of today. The greatest hourly amount of rainfall was 0.18 inch which fell between 1 and 2 A.M. EDT early this morning. Temperatures have fallen from 44F at midnight EST 36F on gusty north to north-northeast during this morning. A second area of rain brought more light rain starting just after noon with a temperature of 36F. Today's Observations: 7 A.M. Weather: Obscurement at 100 feet, heavy fog, very light drizzle Temperature: 40F, Dew point: 40F, Wind: NNE at 12G21 kts, Wind: Peak wind gust 26 kts from N @ 6:42 a.m., Wind: Direction variability NNW-ENE Sea-level pressure: 29.92 inches Hg, rising Visibility: 1/16 variable to zero in fog 6-hour minimum temperature: 40F 6-hour precip: 0.02 in. 24-hour precip: 0.36 in. BHO SA 1155 W1 X 1/16V L-F 132/40/40/0212G21/992/ VSBY 1/16V0 PCPN VRY LGT PK WND 0126/42/ WND 34V06/ 8//// 53013 MANUAL 6002/ ASOS 60003 MANUAL 70036 ASOS 70035 10043 20040 10 A.M. Weather: Low overcast stratus Temperature: 36F, Dew point: 35F, Wind: NNE at 12G22 kts, Sea-level pressure: 29.94 inches Hg, rising Visibility: 8 miles, thin fog 3-hour precip: trace BHO SA 1455 E6 OVC 8 139/36/35/0212G22/994/ THN FG/ 8/6// 53007 MANUAL 6000/ WEATHER SUMMARY FOR FRIDAY APRIL 10, 2009 TEMPERATURE (DEGREES F) MAX.....65 NORMAL.....53 MIN.....41 NORMAL.....35 MEAN....53 NORMAL.....44 DEPARTURE FROM 30-YEAR NORMAL..................+9 TOTAL DEPARTURE FOR THE MONTH.................+29 [+2.7 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............12 DEPARTURE.........-9 TOTAL HEATING UNITS FOR THE MONTH............193 DEPARTURE........-29 TOTAL HEATING UNITS FOR THE SEASON..........5611 DEPARTURE........-75 TOTAL HEATING UNITS LAST SEASON TO DATE.....5352 DIFFERENCE......+259 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............37 SSW AT 4:49 P.M. AEROVANE.............35 SSW AT 4:49 P.M. ASOS.................33 SSW AT 4:54 P.M. DAVIS................36 SSW AT 5:05 P.M. FASTEST MILE FOR YESTERDAY..............26 SW AT 4:53 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........23 SSW AT 5:06 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........25 SW AT 4:54 P.M. AVERAGE............10.4 W ASOS...............10.1 DAVIS...............9.9 WSW [240 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.36 DEPARTURE.........+0.21 ASOS...............0.35 TOTAL PRECIPITATION FOR THE MONTH...........2.64 DEPARTURE.........+1.14 ASOS...............2.71 TOTAL PRECIPITATION FOR THE YEAR...........12.72 DEPARTURE.........-2.41 ASOS..............13.84 # # Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09. 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.........-1.1 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+20.7 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 4/1 43/31/38/-3/0.13/0/015/02 24 SE 4/2 52/39/46/+4/0.02/0/000/00 20 SSE 4/3 58/45/52/+10/0.70//000/00 39 SSE AERO 38 MPH SSE TSTM 4/4 51/38/45/+3/0.01/0/.../.. 48 WSW AERO 48 MPH WSW 4/5 58/37/48/+5/0/0/551/71 40 W AERO 37 MPH W 4/6 55/38/47/+4/1.42/0/047/006 42 SE AER0 40 MPH SE TSTM 4/7 50/34/42/-1/T/0/.../.. 36 WSW AERO 35 MPH WSW 4/8 45/32/39/-5/0/0/.../.. 33 SW AERO 31 MPH SW 4/9 60/34/47/+3/0/0/.../.. 36 SSW AERO 33 MPH SSW 4/10 65/41/53/+9/../../.../.. 37 SSW AERO 35 MPH SSW 4/11 our morning low temp: 40F; the normal low is now 36F NEW DAILY RECORDS FOR APRIL 2009... None to date.. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 11 HIGH 78 IN 1945 LOW 19 IN 1909 PRECIP 1.72 IN. IN 2003 SNOWFALL 9.5 IN. IN 1958 PEAK GUST 65 MPH NW IN 1963 RECORDS FOR APRIL 12 HIGH 82 IN 1945 LOW 17 IN 1926 PRECIP 1.51 IN. IN 1993 SNOWFALL 12.0 IN. IN 1894 PEAK GUST 65e MPH W IN 1978 TODAY'S REPORT PREPARED BY: Robert Skilling