BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, OCTOBER 29, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast stratocumulus, few breaks in overcast Temperature: 40F, Dew point: 38F, Wind: N at 10 kts Wind: Direction variable W to NE Sea-level pressure: 30.27 inches Hg, rising Visibility: 55 miles 6-hour minimum temp: 40F 24-hour precipitation: 0.79 inch BHO SA 1155 E18 OVC 55 251/40/38/3610/027/ FEW BRKS IOVC WND 28V05/ 8/5// 51021 MANUAL 70079 ASOS 70080 10046 20040 10 A.M. Weather: Overcast stratocumulus, break in overcast SE-S Temperature: 45F, Dew point: 39F, Wind: N at 8 kts, Wind: Direction variable WNW to NE Sea-level pressure: 30.32 inches Hg, rising Visibility: 35 miles, light haze BHO SA 1455 E20 OVC 35 269/45/39/0108/032/ BINOVC SE-S WND 29V05 LGT HZ/ 8/5// 51018 1 P.M. Weather: Overcast stratocumulus, breaks in overcast W-N Temperature: 46F, Dew point: 39F, Wind: N at 6 kts, Wind: Direction variable WNW to ENE Sea-level pressure: 30.31 inches Hg, falling Visibility: 35 miles, light haze 6-hour maximum temp: 46F BHO SA 1755 E20 OVC 35 265/46/39/3606/031/ BRKS IOVC W-N WND 30V06 LGT HZ/ 8/5// 58004 10046 20040 WEATHER SUMMARY FOR WEDNESDAY, OCTOBER 28 TEMPERATURE (DEGREES F) MAX.....50 NORMAL.....56 MIN.....46 NORMAL.....39 MEAN....48 NORMAL.....48 DEPARTURE FROM 30-YEAR AVERAGE............0 TOTAL DEPARTURE FOR THE MONTH...........-58 [-2.3 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............17 DEPARTURE........0 TOTAL HEATING UNITS FOR THE MONTH...........419 DEPARTURE......+51 TOTAL HEATING UNITS FOR THE SEASON..........576 DEPARTURE......+39 TOTAL HEATING UNITS LAST SEASON TO DATE.....467 DIFFERENCE....+109 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............46 NNE AT 5:57 P.M. AEROVANE..............46 NE AT 6:54 P.M. ASOS..................45 NE AT 5:57 P.M. DAVIS.................42 NNE AT 5:56 P.M. FASTEST MILE FOR YESTERDAY...............29 NNE AT 5:57 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............29 NE AT 2:39 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........28 NNE AT 7:56 P.M. AVERAGE WIND SPEED AND DIRECTION.......17.5 NNE ASOS................16.1 DAVIS...............16.3 NNE [033 DEG] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.79 DEPARTURE....+0.64 ASOS..............0.80 TOTAL PRECIPITATION FOR MONTH..............7.16 DEPARTURE....+3.19 ASOS..............7.18 TOTAL PRECIPITATION FOR THE YEAR..........45.04 DEPARTURE....+3.47 ASOS.............46.24 PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/1 56/39/48/-9/0/155/22 27 WSW 10/2 60/40/50/-6/0/442/63 23 SSE 10/3 63/51/57/+1/1.10/000/00 32 ESE AERO 30 MPH ESE 10/4 67/57/62/+6/0/202/29 21 WSW 10/5 64/49/57/+2/0/595/86 33 W AERO 31 MPH W 10/6 65/45/55/0/0/628/91 25 W 10/7 67/51/59/+4/0.70/344/50 54 W AERO 54 MPH W 10/8 61/48/55/+1/0/602/88 43 W AERO 39 MPH W 10/9 60/48/54/0/0.05/000/00 29 SSE 10/10 62/42/52/-2/0.26/205/30 37 NW 10/11 61/39/50/-3/0/655/97 35 WSW AERO 33 MPH W 10/12 53/36/45/-8/T/471/70 23 SSW 10/13 51/36/44/-8/0.20/074/11 35 WNW 10/14 52/32/42/-10/0/494/74 27 NW 10/15 41/32/37/-15/0.19/000/00 29 NNE 10/16 41/33/37/-14/0.24/000/00 37 NNE AERO 35 MPH NNE T SNOW 10/17 48/33/41/-10/0/250/38 35 NNE 10/18 46/32/39/-12/1.79/000/00 43 NNE SNOWFALL 3.0 INS 10/19 52/33/43/-8/0/628/96 25 NNW 10/20 65/38/52/+2/0/566/87 23 W 10/21 68/48/58/+8/0/363/56 19 W 10/22 74/50/62/+12/0/265/41 30 S 10/23 57/38/48/-1/T/000/00 35 NW AERO 32 MPH NW 10/24 67/42/55/+6/1.58/000/00 53 S AERO 51 MPH S 10/25 64/44/54/+5/0.06/.../.. 35 W AERO 35 MPH W 10/26 59/40/50/+2/0/.../.. 27 NW 10/27 50/43/47/-1/0.01/000/00 24 NNE 10/28 50/46/48/0/0.78/000/00 46 NNE AERO 46 MPH NE 10/29 our morning low temp: 40F; the normal low is now 39F NEW DAILY RECORDS FOR OCTOBER 2009 10/7: NEW RECORD WIND GUST 54 MPH W AT 2005E; surpasses previous record of 52 MPH ESE in 1972 10/15: NEW RECORD LOW MAXIMUM TEMPERATURE 41; surpasses previous 47 set in 1887 and 1896 10/16: NEW RECORD LOW MAXIMUM TEMPERATURE 41; surpasses previous 42 set in 1940 10/16: NEW RECORD DAILY SNOWFALL TRACE; surpasses previous zero for the date 10/18: NEW RECORD DAILY SNOWFALL 3.0 INS; surpasses previous trace in 1972 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 29 HIGH 74 IN 1989 LOW 23 IN 1891 PRECIP 2.27 INCHES IN 1953 SNOWFALL 1.5 INCHES IN 2005 PEAK GUST 69 S IN 2003 RECORDS FOR OCTOBER 30 HIGH 75 IN 1946,1989 LOW 21 IN 1928 PRECIP 1.85 INCHES IN 1917 SNOWFALL 0.6 INCHES IN 2000 PEAK GUST 66 NW IN 1963 TODAY'S REPORT PREPARED BY: Stephanie Radner