BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, OCTOBER 3, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Sky obscured, moderate rain and fog Temperature: 56F, Dew point: 56F, Wind: ESE at 14 kts Sea-level pressure: 30.01 inches Hg, rising Visibility: 1/8 mile 6-hour minimum temp: 52F 24-hour precipitation: 0.13 inch BHO SA 1155 W1 X 1/8RF 161/56/56/1214/001/ 8//// 55000 6013/ 70013 10056 20052 10 A.M. Weather: Sky obscured, light rain and fog Temperature: 61F, Dew point: 61F, Wind: ESE at 12G26 kts Wind: Peak gust 27 kts, ESE at 9:07 A.M. Sea-level pressure: 30.00 inches Hg, falling Visibility: 1/4 mile variable, 1/8-2 miles 3-hour precipitation: 0.44 inch BHO SA 1455 W2 X 1/4VR-F 158/61/61/1216G26/000/ STRA DRFTG OVR SMT VSBY 1/8V2 PK WND 1227/07/ 8//// 58003 6044/ WEATHER SUMMARY FOR FRIDAY, OCTOBER 2 TEMPERATURE (DEGREES F) MAX.....60 NORMAL.....65 MIN.....40 NORMAL.....47 MEAN....50 NORMAL.....56 DEPARTURE FROM 30-YEAR AVERAGE...........-6 TOTAL DEPARTURE FOR THE MONTH............-15 [-7.7 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............15 DEPARTURE.......+6 TOTAL HEATING UNITS FOR THE MONTH............32 DEPARTURE......+14 TOTAL HEATING UNITS FOR THE SEASON..........189 DEPARTURE.......+2 TOTAL HEATING UNITS LAST SEASON TO DATE.....129 DIFFERENCE.....+60 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............23 SSE AT 6:50 P.M. AEROVANE..............21 SSE AT 6:50 P.M. ASOS..................22 S AT 6:50 P.M. DAVIS.................19 SSE AT 6:50 P.M. FASTEST MILE FOR YESTERDAY...............17 ESE AT 11:58 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............15 SE AT 11:59 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........N/A AVERAGE WIND SPEED AND DIRECTION.......10.5 WSW ASOS.................9.4 DAVIS................8.7 SSW [206 DEG] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.13 DEPARTURE....-0.01 ASOS..............0.12 TOTAL PRECIPITATION FOR MONTH..............0.13 DEPARTURE....-0.15 ASOS..............0.12 TOTAL PRECIPITATION FOR THE YEAR..........38.01 DEPARTURE....+0.13 ASOS.............39.18 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 9/1 71/51/61/-6/0/773/98 17 NW 9/2 76/54/65/-1/0/786/100 22 S 9/3 77/56/67/+1/0/587/75 19 SW 9/4 77/60/69/+3/0/764/98 18 NE 9/5 81/59/70/+5/0/591/76 25 NNW 9/6 64/53/59/-6/0/743/96 31 NNE 9/7 70/52/61/-4/0/709/92 20 WSW 9/8 75/56/66/+1/0/369/48 18 WSW 9/9 68/55/62/-2/0/352/46 36 NNE AERO 33 MPH NNE 9/10 65/53/59/-5/0/603/79 31 ENE 9/11 61/54/58/-6/0.49/000/00 30 NE 9/12 63/60/62/-1/1.74/000/00 30 NNE TSTM 9/13 76/58/67/+4/0.06/393/52 28 NW 9/14 74/55/65/+2/0/699/93 22 WSW 9/15 75/56/66/+4/0/682/91 22 WNW 9/16 61/53/57/-5/T/060/08 31 NNE AERO 29 MPH NNE 9/17 60/49/55/-7/0/022/03 27 N 9/18 71/47/59/-2/T/571/77 35 WSW AERO 30 MPH WSW 9/19 65/45/55/-6/0/716/97 30 NW AERO 28 MPH WNW 9/20 71/45/58/-3/0/721/98 22 SW 9/21 76/50/63/+3/0/703/96 20 S 9/22 74/55/65/+5/0/124/17 27 SSW 9/23 78/61/70/+10/0/145/20 35 SSW 9/24 77/57/67/+8/0/348/48 25 SW 9/25 63/50/57/-2/0/671/93 33 NW 9/26 62/43/53/-6/0/689/96 24 S 9/27 65/49/57/-1/0.32/000/00 32 SE AERO 31 MPH SE 9/28 73/55/64/+6/0.38/619/87 43 W AERO 39 MPH W; DAVIS 45 MPH WSW TSTM 9/29 67/54/61/+3/0.12/533/75 35 S AERO 35 MPH S 9/30 60/42/51/-6/0/049/07 27 WSW 10/1 56/39/48/-9/0/.../.. 27 WSW AERO 23 MPH WSW 10/2 60/40/50/-6/0/.../.. 23 SSE 10/3 morning low temp: 51F; the normal low is now 47F NEW DAILY RECORDS FOR OCTOBER 2009 None. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 3 HIGH 82F IN 1922 LOW 28F IN 1899 PRECIP 1.76 INCHES IN 1979 PEAK GUST 62 MPH WNW IN 1964 RECORDS FOR OCTOBER 4 HIGH 84F IN 2007 LOW 28F IN 1888 PRECIP 1.07 INCHES IN 1986 PEAK GUST 59 MPH SSW IN 1990 TODAY'S REPORT PREPARED BY: Mike Iacono