BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, MAY 27, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Scattered altocumulus, broken cirrus Temperature: 65F, Dew point: 47F, Wind: NE at 10G14 kt Sea-level pressure: 30.20 inches Hg, rising Visibility: 15 miles, hazy 6-hour min temp. 63F BHO SA 1155 100 SCT 200 BKN 15 227/65/47/0410G14/020/ HAZY/ 8/041 51016 10065 20063 10 A.M. Weather: Scattered altocumulus, broken cirrus Temperature: 71F, Dew point: 50F, Wind: ENE at 10 kt Sea-level pressure: 30.21 inches Hg, steady Visibility: 20 miles, hazy BHO SA 1455 120 SCT 200 BKN 20 232/71/50/0610/021/ HAZY/ 8/041 50005 WEATHER SUMMARY FOR SATURDAY, MAY 26 TEMPERATURE (DEGREES F) MAX.....85 NORMAL.....70 MIN.....66 NORMAL.....50 MEAN....76 NORMAL.....60 DEPARTURE FROM 30-YEAR NORMAL..........+16 TOTAL DEPARTURE FOR THE MONTH..........+60 (+2.1 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............0 DEPARTURE.........-6 TOTAL HEATING UNITS FOR THE MONTH..........212 DEPARTURE........-32 TOTAL HEATING UNITS FOR THE SEASON........5828 DEPARTURE.......-442 TOTAL HEATING UNITS LAST SEASON TO DATE...5711 DIFFERENCE......+117 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............30 W AT 12:01 P.M. AEROVANE.............29 W AT 11:59 A.M. ASOS.................29 W AT 12:10 P.M. ** DAVIS................30 W AT 12:00 P.M. FASTEST MILE FOR YESTERDAY..............24 W AT 12:29 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........22 WNW AT 12:02 P.M. ** MAXIMUM 2-MINUTE DAVIS AVERAGE..........24 W AT 12:01 P.M. AVERAGE WIND SPEED AND DIRECTION........12.4 W ASOS.................11.8 ** DAVIS................13.1 W [261] ** NEW ASOS ULTRASONIC WIND SYSTEM INSTALLED 25 MAY PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.....-0.12 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.71 DEPARTURE.....+0.54 ASOS..............3.64 TOTAL PRECIPITATION FOR THE YEAR..........24.13 DEPARTURE.....+3.01 ASOS.............23.61 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..............27.6 DEPARTURE.....-32.5 PRELIMINARY CLIMATE SUMMARY FOR MAY 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 5/1 67/44/56/+4/0/0/624/74 33 NW 5/2 64/45/55/+3/0.06/0/381/45 36 NW Aero 33 MPH WNW 5/3 67/42/55/+2/0/0/849/100 38 W Aero 37 MPH W 5/4 66/44/55/+2/0/0/842/99 39 WNW Aero 40 MPH WNW 5/5 65/45/55/+2/0/0/384/45 33 N 5/6 51/42/47/-7/T/0/514/60 36 N Aero 33 MPH N 5/7 68/39/54/0/0/0/798/93 25 S 5/8 77/43/60/+6/0/0/851/99 33 S Aero 31 MPH S 5/9 85/54/70/+15/0/0/707/92 30 S 5/10 85/60/73/+18/0/0/692/80 29 S Aero 27 MPH S 5/11 74/60/67/+12/0.02/0/355/41 23 S TSTM A.M. 5/12 63/47/55/-1/0.02/0/469/54 32 NE 5/13 65/46/56/0/T/0/775/89 33 WNW Aero 33 MPH WNW 5/14 73/43/58/+1/0/0/822/94 30 SSW 5/15 80/50/65/+8/0.01/0/210/24 30 S TSTM evening 5/16 66/44/55/-2/0.54/0/527/60 40 NW TSTM P.M. 5/17 50/42/46/-11/0.01/0/009/01 28 NE 5/18 42/39/41/-17/1.93/0/000/00 37 NNE 5/19 51/40/46/-12/0.71/0/000/00 25 NNW 5/20 59/49/54/-4/0.41/0/035/04 30 W TSTM P.M. 5/21 63/46/55/-4/0/0/693/78 29 WNW 5/22 71/46/59/0/0/0/800/90 25 SSE 5/23 74/47/61/0/0/757/85 30 SSE 5/24 86/50/68/+8/0/0/.../.. 25 WSW 5/25 91/66/79/+19/0/0/.../.. 24 W 5/26 85/66/76/+16/0/0/.../.. 30 W NEW DAILY RECORDS FOR MAY: 5/18 Record low maximum temperature, 42; previous 48 in 1895 and 1956. 5/18 Record daily precipitation, 1.93; previous 1.58 inches in 2002. 5/25 Record high maximum temperature, 91; previous 89 in 1981. 5/25 Record high minimum temperature, 66; previous 65 in 1991. 5/26 Record high minimum temperature, 66; previous 63 in 1981. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 27 HIGH 92F IN 1914 LOW 36F IN 1915 PRECIP 1.40 INCHES IN 1898 PEAK GUST 55 S IN 1956 RECORDS FOR MAY 28 HIGH 90F IN 1929 LOW 39F IN 1917 PRECIP 2.48 INCHS 1906 PEAK GUST 51e MPH NE IN 1946 TODAY'S REPORT PREPARED By: Andrew Hoell