BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, SEPTEMBER 29, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME SEPTEMBER SUNSHINE NEAR RECORD OF 74 PERCENT...SEPTEMBER AMONG TOP TEN WARMEST ON RECORD... After two days of near normal sunshine, a nearly clear sky today will raise sunshine back to 75 percent and push the monthly sunshine ahead of the present sunniest on record of 74 percent (268 hours) in 1983. The mean temperature for September through the 28th of 64.9 is among the top ten warmest on record. Drier air is moving back into New England today with the dew point in the low 40s this afternoon. Cooler temperatures will arrive on Sunday. Today's observations: 7 A.M. Weather: Scattered altocumulus, stratocumulus castellanus offshore Temperature: 55F, Dew point: 49F, Wind: NW at 11 kts Sea-level pressure: 30.13 inches Hg, rising rapidly Visibility: 70 miles 6-hour min temp: 55F 24-hour rainfall: trace BHO SA 1155 65 SCT 70 202/55/49/3211/013/ SCCAS OFFSHR DSNT E-SE PRESRR/ 8/230 53044 10057 20055 10 A.M. Weather: Clear with a few stratocumulus and small cumulus Temperature: 65F, Dew point: 43F, Wind: NW at 11G18 kts Sea-level pressure: 30.21 inches Hg, rising Visibility: 70 miles BHO SA 1455 CLR 70 229/65/43/3211G18/021/ FEW SC OFFSHR DSNT ESE-SSE FEW SML CU DSNT SW-NW WND 29V35/ 8/500 51027 1 P.M. Weather: Clear with a few small cumulus Temperature: 70F, Dew point: 43F, Wind: NW at 14G24 kts Wind: Variable W-N Sea-level pressure: 30.23 inches Hg, rising Visibility: 75 miles 6-hour max. temp. 71F BHO SA 1755 CLR 75 236/70/43/3114G24/023/ FEW SML CU ALQDS WND 27V35/ 8/100 51007 10071 20055 WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 28 TEMPERATURE (DEGREES F) MAX.....77 NORMAL.....67 MIN.....57 NORMAL.....49 MEAN....67 NORMAL.....58 DEPARTURE FROM 30-YEAR NORMAL.........+9 TOTAL DEPARTURE FOR THE MONTH.......+109 [+3.7 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..............25 WSW AT 9:40 A.M. AEROVANE...............25 WNW AT 6:48 P.M. ASOS...................23 NW AT 6:49 P.M. DAVIS..................25 W AT 11:56 A.M. FASTEST MILE FOR YESTERDAY................18 WSW AT 9:40 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.............18 W AT 11:56 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE............20 W AT 11:56 A.M. AVERAGE WIND SPEED AND DIRECTION..........11.9 W ASOS...................11.1 DAVIS..................12.1 WSW [251 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace DEPARTURE.....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.89 DEPARTURE.....-1.96 ASOS..............1.89 TOTAL PRECIPITATION FOR THE YEAR..........32.88 DEPARTURE.....-4.44 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 morning low temp. of 55F; normal low is now 49F * 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 29 HIGH 85F IN 1952 LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD) PRECIP 2.61 INCHES IN 1907 PEAK GUST 62 MPH S IN 2005 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 TODAY'S REPORT PREPARED By: Mike Iacono