BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, MAY 1, 2005 ALL TIMES ARE IN EASTERN STANDARD TIME [unless otherwise noted] Today's observations: 7 A.M. EST Weather: Obscured sky Temperature: 55F, Dew point: 55F, Wind: SSW at 6 kt Sea-level pressure: 29.72 inches Hg, steady Visibility: 1/16 of a mile BHO SA 1155 W2 X 1/16F 065/55/55/2006/972/ WND L/V/ 8//// ASOS 60002 MANUAL 70047 10055 20054 10 A.M. EST Weather: Obscured sky Temperature: 56F, Dew Point: 56F, Wind: SW at 3 kt Visibility: 1/16 of a mile Sea-level pressure: 29.72 inches Hg, steady BHO SA 1455 W2 X 1/16R-F 065/56/56/2403/972/ WND LGT/ 8//// 6009/ 58000 1 P.M. EST Weather: Overcast stratocumulus Temperature: 51F, Dew Point: 50F, Wind: W at 12 kt Visibility: 20 miles Sea-level pressure: 29.72 inches Hg, steady BHO SA 1755 30 OVC 20 063/51/50/2712G20/972/ GF W/ 8/5// 6011/ 55002 10057 20051 WEATHER SUMMARY FOR SATURDAY, APRIL 30 TEMPERATURE (DEGREES F) MAX.....54 NORMAL.....61 ASOS.....54 AT MIDNIGHT P.M. MIN.....47 NORMAL.....42 ASOS.....47 AT 7:50 A.M. MEAN....51 NORMAL.....52 DEPARTURE FROM 30-YEAR NORMAL......-1 TOTAL DEPARTURE FOR THE MONTH....+103 (+3.6 DEGREES/DAY) HEATING DEGREE DAY INFORMATION TOTAL HEATING DEGREE DAYS FOR FRIDAY.........14 DEPARTURE.....+1 TOTAL HEATING DEGREE DAYS FOR THE MONTH.....460 DEPARTURE...-103 TOTAL HEATING DEGREE DAYS FOR THE SEASON...5923 DEPARTURE...-103 TOTAL HEATING DEGREE DAYS FOR LAST YEAR....5993 DIFFERENCE...-70 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........35 S AT 5:55 P.M. AEROVANE.........35 S AT 5:52 P.M. ASOS.............32 S AT 5:55 P.M. FASTEST MILE FOR YESTERDAY..........26 S AT 6:37 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......24 S AT 8:13 P.M. AVERAGE WIND SPEED AND DIRECTION...12.0 SE ASOS............12.2 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.47 DEPARTURE....+0.34 ASOS..............0.47 TOTAL PRECIPITATION FOR THE MONTH...........N/A DEPARTURE......N/A ASOS...............N/A TOTAL PRECIPITATION FOR THE YEAR..........21.11 DEPARTURE....+3.18 ASOS.............20.06* *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................0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE SEASON.............119.4 DEPARTURE.....+59.0 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/-6/0/0/622/78 22 MPH WNW 4/14 50/36/43/-3/0/0/760/95 23 MPH WNW 4/15 48/34/41/-5/0/0/787/98 35 MPH NE 4/16 55/35/45/-1/0/0/790/98 22 MPH ESE 4/17 74/37/56/+9/0/0/784/97 23 MPH WNW 4/18 70/48/59/+12/0/0/795/98 27 MPH NW Aero 30 MPH WNW 4/19 78/46/62/+15/0/0/.../.. 27 MPH SSW 4/20 86/47/67/+19/0.05/0/458/56 44 MPH NNE 4/21 58/38/48/0/0.11/0/.../.. 37 MPH N 4/22 61/38/50/+1/T/0/.../.. 33 MPH SSE 4/23 62/41/52/+3/0.50/.../.. 52 MPH S 4/24 58/41/50/+1/0.61/.../.. 46 MPH SE 4/25 50/38/44/-6/0.20/.../.. 39 MPH SSW 4/26 67/40/54/+4/0/0/.../.. 43 MPH S 4/27 54/49/52/+2/.../0/.../.. 35 MPH ESE 4/28 59/41/50/-1/0.07/0/.../.. 42 MPH WSW 4/29 63/38/51/0/.../0/.../.. 39 MPH SW 4/30 54/47/51/-1/.../0/.../.. 35 MPH S DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 1 HIGH 87F IN 1899 LOW 29F IN 1978 PRECIP 2.53 INCHES IN 1921 SNOWFALL TRACE IN 19005,1917,1921,1995 PEAK GUST 57 MPH NW IN 1974 RECORDS FOR MAY 2 HIGH 92F IN 2001 LOW 29F IN 1903 PRECIP 1.15 INCHES IN 1989 SNOWFALL 1.0 INCHES IN 1888 PEAK GUST 58 MPH S IN 1983 TODAY'S REPORT BY: Andrew Hoell