BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, SEPTEMBER 30, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Scattered stratocumulus, overcast cirrus Temperature: 51F, Dew point: 46F, Wind: NNE at 10 kt Sea-level pressure: 30.52 inches Hg, rising Visibility: 60 miles 6-hour min temp: 50 BHO SA 1155 35 SCT E200 OVC 250 OVC 60 335/51/46/0110/052/ FIRE 9 MI WNW/ 8/407 53017 10054 20050 10 A.M. Weather: Broken stratocumulus, overcast cirrus Temperature: 59F, Dew point: 46F, Wind: NE at 9 kt Sea-level pressure: 30.57 inches Hg, rising Visibility: 50 miles BHO SA 1455 E35 BKN 200 OVC 50 352/59/46/0509/057/ WND 34V08/ 8/407 53017 WEATHER SUMMARY FOR SATURDAY, SEPTEMBER 29 TEMPERATURE (DEGREES F) MAX.....72 NORMAL.....66 MIN.....55 NORMAL.....49 MEAN....64 NORMAL.....58 DEPARTURE FROM 30-YEAR NORMAL.........+6 TOTAL DEPARTURE FOR THE MONTH.......+115 [+3.8 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..............30 NW AT 3:49 P.M. AEROVANE...............30 NW AT 3:40 P.M. ASOS...................29 NW AT 3:41 P.M. DAVIS..................30 NW AT 3:49 P.M. FASTEST MILE FOR YESTERDAY................22 NW AT 3:40 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.............21 NNW AT 12:29 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE............22 NW AT 2:27 P.M. AVERAGE WIND SPEED AND DIRECTION..........12.6 NW ASOS...................11.8 DAVIS..................12.9 NW [310 deg] 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..........1.89 DEPARTURE.....-2.10 ASOS..............1.89 TOTAL PRECIPITATION FOR THE YEAR..........32.88 DEPARTURE.....-4.58 ASOS.............32.12 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2007...CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 9/1 79/57/68/+1/0/790/100 25 WNW 9/2 78/51/65/-1/0/787/100 22 S 9/3 85/57/71/+5/0/760/97 31 SSW AERO 28 MPH SSW 9/4 76/61/69/+3/0/641/82 28 NW AERO 26 MPH NW 9/5 74/53/64/-1/0/732/94 21 ESE 9/6 76/55/66/+1/0/380/49 31 S 9/7 92/62/77/+12/0/680/88 30 SSW 9/8 93/67/80/+15/0/686/89 31 S TSTM 9/9 72/57/65/+1/0.16/000/00 28 NNE TSTM 9/10 66/57/62/-2/0.03/000/00 18 NNE 9/11 68/58/63/-1/1.34/000/00 30 WNW 9/12 73/55/64/+1/0/752/99 35 W Aero 33 MPH W 9/13 73/52/63/0/0/741/98 23 ESE 9/14 76/56/66/+3/0/587/78 26 SSE 9/15 63/49/56/-6/0.33/225/30 36 WNW 9/16 65/45/55/-7/0/606/81 20 WNW 9/17 63/46/55/-7/0/738/99 20 NE 9/18 64/46/55/-6/0/720/97 22 NE 9/19 69/48/59/-2/0/414/56 18 S 9/20 81/53/67/+6/0/597/81 18 SSW 9/21 77/60/69/+9/0/653/89 20 N 9/22 79/60/70/+10/0/417/57 27 S 9/23 77/59/68/+8/0/713/98 25 WNW 9/24 80/55/68/+9/0/703/97 24 WNW 9/25 86/57/72/+13/0/701/97 27 SSW 9/26 91/67/79/+20/0/641/89 32 S Aero 32 MPH S * 9/27 83/65/74/+16/0.02/.../.. 30 SSW Aero 29 MPH SSW * 9/28 77/57/67/+9/0.01/.../.. 25 WSW 9/29 72/55/64/+6/0/.../.. 30 NW * Aerovane gusts corrected for 9/26 and 9/27. NEW DAILY RECORDS FOR SEPTEMBER 2007: 9/7 - RECORD HIGH TEMPERATURE 92; PREVIOUS 91 IN 1945. 9/8 - RECORD HIGH TEMPERATURE 93; PREVIOUS 91 IN 1945. 9/26 - RECORD HIGH TEMPERATURE 91; PREVIOUS 87 IN 1958. - EQUALED HIGH MINIMUM TEMPERATURE OF 67; ALSO IN 1920. - LATEST 90-DEG. TEMPERATURES; PREVIOUS RECORD WAS 93 DEG. ON SEPT. 23, 1895 AND 1914. 9/27 - RECORD HIGH MINIMUM TEMPERATURE OF 65; PREVIOUS 63 IN 1930. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 30 HIGH 84F IN 1986 LOW 31F IN 1992 PRECIP 1.93 INCHES IN 1946 PEAK GUST 58 MPH SSE IN 1999 RECORDS FOR OCTOBER 1 HIGH 85F IN 1927 LOW 30F IN 1992 PRECIP 1.44 INCHES IN 1984 PEAK GUST 68e MPH SSE IN 1977 TODAY'S REPORT PREPARED By: Andy Hoell