BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, OCTOBER 2, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME MONTH OF SEPTEMBER 2009 STATS September was slightly cooler and about one inch drier than average. Sunnier than average by 6 points TEMPERATURE Deg. F Av. Max. 69.9 Av. Min. 52.9 Mean 61.4 [-0.7] Max. temp: 81/5th Min. temp: 42/30th Heating units: 123 [-15] Cooling units: 22 [-27] PRECIPITATION [ins.] Total 3.11 [-1.02] Greatest in 24 hours: 1.84 [11-12] No. of days measurable: 6 WIND [MPH] Av. speed: 10.7 [uncorrected] Av. speed: 11.2 [corrected] Prevailing direction: NE @ 13% Peak gust: 43 MPH W on 28th Fastest mile: 28 MPH W on 28th, SSW on 29th SUNSHINE Total 14022 minutes or 233.7 hours (astronomical) Total 13488 minutes or 224.8 hours (card, uncorrected) Today's observations: 7 A.M. Weather: Scattered altocumulus, line of stratocumulus along horizon NE-E Temperature: 43F, Dew point: 39F, Wind: WSW at 8 kts Sea-level pressure: 30.05 inches Hg, rising Visibility: 70 miles 6-hour minimum temp: 40F 24-hour precipitation: 0.00 inch BHO SA 1155 110 SCT 70 175/43/39/2508/005/ SC ALG HRZN NE-E/ 8/530 51011 10046 20040 10 A.M. Weather: Scattered stratocumulus and cirrus Temperature: 53F, Dew point: 41F, Wind: WSW at 10 kts Wind: Direction variable from SSW to WNW Sea-level pressure: 30.09 inches Hg, rising Visibility: 60 miles BHO SA 1455 45 SCT 250 SCT 60 190/53/41/2510/009/ WND 21V29/ 8/501 51015 1 P.M. Weather: Scattered stratocumulus, altocumulus, broken cirrus, patches dense cirrus Temperature: 60F, Dew point: 41F, Wind: SSW at 10 kts Sea-level pressure: 30.05 inches Hg, falling Visibility: 60 miles 6-hour max. temp: 60F BHO SA 1755 45 SCT 150 SCT E200 BKN 60 177/60/41/2110/005/ PTCHS DENS CI/ 8/532 56013 10060 20043 WEATHER SUMMARY FOR THURSDAY, OCTOBER 1 TEMPERATURE (DEGREES F) MAX.....56 NORMAL.....66 MIN.....39 NORMAL.....48 MEAN....48 NORMAL.....57 DEPARTURE FROM 30-YEAR AVERAGE...........-9 TOTAL DEPARTURE FOR THE MONTH............-9 HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............17 DEPARTURE.......+8 TOTAL HEATING UNITS FOR THE MONTH............17 DEPARTURE.......+8 TOTAL HEATING UNITS FOR THE SEASON..........174 DEPARTURE.......-4 TOTAL HEATING UNITS LAST SEASON TO DATE.....118 DIFFERENCE.....+56 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............27 WSW AT 2:03 P.M. * AEROVANE..............23 WSW AT 1:16 P.M. * ASOS..................25 W AT 1:16 P.M. DAVIS.................24 W AT 10:40 A.M. FASTEST MILE FOR YESTERDAY...............18 WSW AT 1:32 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............18 W AT 1:30 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........18 WSW AT 10:39 A.M. AVERAGE WIND SPEED AND DIRECTION.......10.3 WSW ASOS.................9.6 DAVIS................9.3 WSW [250 DEG] * last of several occurrences... 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 MONTH..............0.00 DEPARTURE....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR..........37.88 DEPARTURE....+0.14 ASOS.............39.06 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 our morning low temp: 40F; 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 2 HIGH 85F IN 1968 LOW 29F IN 1899 PRECIP 1.75 INCHES IN 1984 PEAK GUST 52e MPH S IN 1952, 52 NNW IN 1984 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 TODAY'S REPORT PREPARED BY: Stephanie Radner/Robert Skilling