BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, SEPTEMBER 28, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME YESTERDAY'S RAINFALL ONLY ONE THIRD OF AN INCH SUNSHINE AND MILD TEMPERATURES RETURN TODAY Sunday's rainfall began during the pre-dawn hours but never accumulated more than a few hundredths of an inch per hour with the exception of 6 to 8 a.m. EDT when hourly totals of 0.05 and 0.08 inch occurred. The total for the event fell far short of what was predicted to be an inch or more of rainfall. Heavy rain did occur in southeastern Massachusetts where amounts were from one to over two inches on Cape Cod. Sunshine and mild temperatures returned today with highs expected in the 70's for one last time before much cooler seasonably fall-like weather returns. Today's observations: 7 A.M. Weather: Clear, (SKC), no cloud visible anywhere, few stratus dissipated past hour Temperature: 58F, Dew point: 57F, Wind: WSW at 13 kts Sea-level pressure: 29.54 inches Hg, rising Visibility: 55 miles 6-hour minimum temp: 57F 24-hour precipitation: 0.16 inches BHO SA 1155 CLR 55 004/58/57/2413/954/ FEW STRA DSSPTD PST HR/ 51021 ASOS 70016 MANUAL 70016 10062 20057 10 A.M. Weather: Clear, stratocumulus forming Temperature: 66F, Dew point: 57F, Wind: SSW at 14 kts Sea-level pressure: 29.57 inches Hg, falling Visibility: 40 miles, light distant haze BHO SA 1455 CLR 40 014/66/57/2014/957/ SC FRMG ALQDS LGT DSNT HZ/ 8/500 50010 WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 27 TEMPERATURE (DEGREES F) MAX.....65 NORMAL.....67 MIN.....49 NORMAL.....49 MEAN....57 NORMAL.....58 DEPARTURE FROM 30-YEAR AVERAGE...........-1 TOTAL DEPARTURE FOR THE MONTH...........-17 [-0.8 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............8 DEPARTURE.......+1 TOTAL HEATING UNITS FOR THE MONTH...........104 DEPARTURE......-10 TOTAL HEATING UNITS FOR THE SEASON..........138 DEPARTURE.......-7 TOTAL HEATING UNITS LAST SEASON TO DATE.....111 DIFFERENCE.....+27 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............32 SE AT 10:49 A.M. AEROVANE..............31 SE AT 10:49 A.M. ASOS..................28 SE AT 12:35 P.M. DAVIS.................31 SE AT 10:49 A.M. FASTEST MILE FOR YESTERDAY...............22 ESE AT 7:03 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............22 S AT 8:01 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........23 S AT 8:01 P.M. AVERAGE WIND SPEED AND DIRECTION.......16.6 SE ASOS................15.2 DAVIS...............15.7 SE [135 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.16 DEPARTURE....+0.02 ASOS..............0.15 TOTAL PRECIPITATION FOR MONTH..............2.61 DEPARTURE....-1.10 ASOS..............2.65 TOTAL PRECIPITATION FOR THE YEAR..........37.38 DEPARTURE....+0.20 ASOS.............38.57 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 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/.../.. 33 NW 9/26 62/43/53/-6/0/.../.. 24 S 9/27 65/49/57/-1/0.32/000/00 32 SE AERO 31 MPH SE 9/28 our morning low temp: 57F; the normal low is now 49F NEW DAILY RECORDS FOR SEPTEMBER 2009 TO DATE... None. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 28 HIGH 82F IN 1959 LOW 33F IN 1897,1947 PRECIP 1.53 INCHES IN 1956 PEAK GUST 69 MPH NE IN 1962 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 TODAY'S REPORT PREPARED BY: Robert Skilling