BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, MAY 15, 2005 ALL TIMES ARE IN EASTERN STANDARD TIME [unless otherwise noted] Today's observations: 7 A.M. EST Weather: Overcast altocumulus with a few stratocumulus Temperature: 52F, Dew point: 47F, Wind: NNW at 4 kt Sea-level pressure: 29.83 inches Hg, rising Visibility: 12 miles BHO SA 1155 100 OVC 12 102/52/47/3404/983/ FEW BINOVC ALQDS SUN DMLY VSBL FEW ACSL SW FEW SC NE-E WND L/V/ 8/47/ 51011 70000 10053 20050 10 A.M. EST Weather: Light rain shower, overcast altocumulus with a few stratocumulus Temperature: 54F, Dew point: 47F, Wind: NNE at 10 kt Sea-level pressure: 29.81 inches Hg, falling Visibility: 20 miles BHO SA 1455 90 OVC 20RW- 096/54/47/0210/981/ FEW SC FRMG N-NE RB54/ 8/47/ 58008 6000/ WEATHER SUMMARY FOR SATURDAY, MAY 14 TEMPERATURE (DEGREES F) MAX.....64 NORMAL.....67 ASOS.....64 AT 4:37 P.M. MIN.....47 NORMAL.....46 ASOS.....47 AT 3:18 A.M. MEAN....56 NORMAL.....57 DEPARTURE FROM 30-YEAR NORMAL......-1 TOTAL DEPARTURE FOR THE MONTH.....-56 (-4.0 DEGREES/DAY) HEATING DEGREE DAY INFORMATION TOTAL HEATING DEGREE DAYS FOR FRIDAY..........9 DEPARTURE.....+1 TOTAL HEATING DEGREE DAYS FOR THE MONTH.....206 DEPARTURE....+51 TOTAL HEATING DEGREE DAYS FOR THE SEASON...6129 DEPARTURE....-52 TOTAL HEATING DEGREE DAYS FOR LAST YEAR....6082 DIFFERENCE...+38 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........21 E AT 6:57 A.M. AEROVANE.........22 E AT 6:56 A.M. ASOS.............18 SE AT 7:13 A.M. FASTEST MILE FOR YESTERDAY..........16 E AT 6:35 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......16 E AT 6:10 A.M. AVERAGE WIND SPEED AND DIRECTION....7.4 S ASOS.............8.3 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....TRACE DEPARTURE....-0.12 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.72 DEPARTURE....-0.01 ASOS..............1.67 TOTAL PRECIPITATION FOR THE YEAR..........22.81 DEPARTURE....+3.29 ASOS.............21.70* *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......0.0 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE SEASON.............119.4 DEPARTURE....+59.3 PRELIMINARY CLIMATE SUMMARY FOR MAY 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 5/1 57/44/51/-1/0.14/118/14 33 MPH WNW 5/2 63/39/51/-1/0.05/593/70 43 MPH S 5/3 58/38/48/-5/0/604/71 30 MPH WSW 5/4 59/40/50/-3/T/400/47 21 MPH E 5/5 60/38/49/-4/0/777/91 23 MPH E 5/6 54/42/48/-6/0.08/103/12 26 MPH NNE 5/7 44/39/42/-12/1.19/000/00 58 MPH N 5/8 47/39/43/-11/0.22/000/00 43 MPH NNW 5/9 52/43/48/-7/0.04/026/03 36 MPH N 5/10 64/46/55/0/0/502/58 20 MPH E 5/11 75/46/61/+6/0/.../.. 27 MPH S 5/12 60/41/51/-5/0/0/.../.. 40 MPH NW 5/13 64/35/50/-6/0/0/.../.. 28 MPH WNW 5/14 64/47/56/-1/0/0/.../.. 21 MPH E DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 15 HIGH 93F IN 1900 LOW 36F IN 1947,1985 PRECIP 1.63 INCHES IN 1978 PEAK GUST 53e MPH NE IN 1978, W 2002 RECORDS FOR MAY 16 HIGH 90F IN 1951 LOW 30F IN 1936 PRECIP 2.63 INCHES IN 1954 PEAK GUST 56e MPH NW IN 1952 TODAY'S REPORT BY: Andrew Hoell