BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, APRIL 17, 2005 ALL TIMES ARE IN EASTERN STANDARD TIME [unless otherwise noted] Today's observations: 7 A.M. EST Weather: Clear with a few cirrus Temperature: 41F, Dew point: 22F, Wind: W at 10 kt Sea-level pressure: 30.25 inches Hg, falling Visibility: 50 miles BHO SA 1155 CLR 50 243/41/22/2710/025/ FEW CI NE-SE K LYR ALNG HRZN NNW-E/ 8/001 56012 10041 20037 10 A.M. EST Weather: Clear Temperature: 58F, Dew Point: 24F, Wind: W at 7 kt Visibility: 45 miles Sea-level pressure: 30.20 inches Hg, falling BHO SA 1455 CLR 45 226/58/24/2707/020/ WND 24V34 K LYR ALNG HRZN N-NE/ 58017 WEATHER SUMMARY FOR SATURDAY, APRIL 16 TEMPERATURE (DEGREES F) MAX.....55 NORMAL.....56 ASOS.....55 AT 2:45 P.M. MIN.....35 NORMAL.....37 ASOS.....35 AT 4:45 A.M. MEAN....45 NORMAL.....46 DEPARTURE FROM 30-YEAR NORMAL......-1 TOTAL DEPARTURE FOR THE MONTH.....+45 (+2.8 DEGREES/DAY) HEATING DEGREE DAY INFORMATION TOTAL HEATING DEGREE DAYS FOR FRIDAY.........20 DEPARTURE.....+1 TOTAL HEATING DEGREE DAYS FOR THE MONTH.....294 DEPARTURE....-45 TOTAL HEATING DEGREE DAYS FOR THE SEASON...5757 DEPARTURE....-46 TOTAL HEATING DEGREE DAYS FOR LAST YEAR....5825 DIFFERENCE...-88 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........22 ESE AT 8:04 P.M. AEROVANE.........21 ESE AT 8:04 P.M. ASOS.............20 E AT 2:13 P.M. FASTEST MILE FOR YESTERDAY..........16 ESE AT 8:02 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......15 ESE AT 8:10 P.M. AVERAGE WIND SPEED AND DIRECTION...9.3 NE ASOS............9.5 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.04 DEPARTURE....-0.35 ASOS..............2.04 TOTAL PRECIPITATION FOR THE YEAR..........18.50 DEPARTURE....+2.63 ASOS.............17.52* *EXCLUDES 3.19 INCHES OF ERRONEOUS PRECIPITATION RECORDED FROM 1/23-1/28. 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.....-1.5 TOTAL SNOWFALL FOR THE SEASON.............119.4* DEPARTURE....+60.5 * THIRD GREATEST SEASONAL SNOW TOTAL ON RECORD. PRELIMINARY CLIMATE SUMMARY FOR APRIL 2005......CALENDAR DAY DATA DATA REPORTED: DATE MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 4/1 56/36/46/+5/0.01/0/283/37 23 MPH SE 4/2 56/35/46/+4/1.04/0/000/00 53 MPH SE 4/3 53/39/46/+4/0.63/0/254/33 54 MPH SE Aero 55 MPH SE 4/4 52/37/45/+3/0.01/0/131/17 32 MPH W 4/5 63/35/49/+6/0/0/721/93 32 MPH WNW Aero 35 MPH WNW 4/6 66/43/55/+12/0/0/591/76 25 MPH S 4/7 70/44/57/+14/0.07/0/164/21 46 MPH SSW 4/8 56/43/50/+6/0.25/0/212/27 32 MPH NW 4/9 58/39/49/+5/0/0/786/100 22 MPH NW 4/10 70/39/55/+11/0/0/742/94 38 MPH NNE 4/11 48/36/42/-3/0/0/744/94 32 MPH NNE 4/12 48/28/38/-7/0.03/0.2/413/52 32 MPH NE 4/13 50/28/39/-6/0/0/427/78 22 MPH WNW 4/14 50/36/43/-3/0/0/.../.. 37 MPH NE Aero 35 MPH NE 4/15 48/34/41/-5/0/0/.../.. 35 MPH NE Aero 34 MPH NE 4/16 55/35/45/-1/0/0/.../.. 22 MPH ESE DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 17 HIGH 93 IN 2002 LOW 21 IN 1908 PRECIP 1.68 INCHES IN 1954 SNOWFALL 1.0 INCHES IN 1899 PEAK GUST 58 MPH NW IN 1994 RECORDS FOR APRIL 18 HIGH 92 IN 1976 LOW 23 IN 1887 PRECIP 1.48 INCHES IN 1954 SNOWFALL 3.7 INCHES IN 1965 PEAK GUST 59 MPH S IN 1982 Andrew Hoell