BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, NOVEMBER 17, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear, few cumulus Temperature: 28F, Dew point: 20F, Wind: WSW at 15 kts Sea-level pressure: 29.92 inches Hg, rising Visibility: 80 miles 6-hour min temp: 28F 24-hour rainfall: 0.03 inch BHO SA 1155 CLR 80 131/28/20/2515/992/ FEW CU DSNT ENE-S AND DSNT WSW-WNW/ 8/100 53024 70003 10029 20028 10 A.M. Weather: Scattered cumulus, few cumulus fractus Temperature: 36F, Dew point: 20F, Wind: WSW at 16G27 kts Wind: Peak wind past hour 27 kts WSW @ 9:54 A.M. Sea-level pressure: 29.95 inches Hg, rising Visibility: 80 miles BHO SA 1455 30 SCT 80 141/36/20/2516G27/995/ FEW CUFRA PK WND 2527/54/ 8/100 50010 1 P.M. Weather: Scattered dense cirrus, broken cirrostratus and cirrocumulus, few cumulus Temperature: 39F, Dew point: 20F, Wind: W at 18G27 kts Wind: Peak gust past hour 32 kts W at 12:36 P.M. Sea-level pressure: 29.97 inches Hg, rising Visibility: 80 miles 6-hour max. temp. 40F BHO SA 1755 180 SCT 250 BKN 80 148/39/20/2618G27/997/ FEW CU ALQDS PK WND 2632/36/ 8/107 53007 10040 20028 WEATHER SUMMARY FOR FRIDAY, NOVEMBER 16 TEMPERATURE (DEGREES F) MAX.....44 NORMAL.....49 MIN.....30 NORMAL.....34 MEAN....37 NORMAL.....42 DEPARTURE FROM 30-YEAR NORMAL...........-5 TOTAL DEPARTURE FOR THE MONTH..........-22 [-1.6 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............28 DEPARTURE.......+5 TOTAL HEATING UNITS FOR THE MONTH...........355 DEPARTURE......+21 TOTAL HEATING UNITS FOR THE SEASON..........701 DEPARTURE.....-224 TOTAL HEATING UNITS LAST SEASON TO DATE.....767 DIFFERENCE.....-66 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............51 W AT 11:53 A.M. AEROVANE.............54 W AT 11:53 A.M. ASOS.................48 WNW AT 11:55 A.M. DAVIS................46 W AT 11:27 A.M. FASTEST MILE FOR YESTERDAY..............37 W AT 11:30 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........36 WNW AT 11:31 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........37 W AT 11:31 A.M. AVERAGE WIND SPEED AND DIRECTION.......20.3 W ASOS................17.9 DAVIS...............20.4 W [273 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.03 DEPARTURE....-0.13 ASOS..............0.03 TOTAL PRECIPITATION FOR THE MONTH..........2.91 DEPARTURE....+0.43 ASOS..............2.89 TOTAL PRECIPITATION FOR THE YEAR..........38.45 DEPARTURE....-6.05 ASOS.............37.72 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE.....-1.3 TOTAL SNOWFALL FOR THE SEASON...............0.0 DEPARTURE.....-1.5 PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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 11/1 66/42/54/+7/0/050/08 37 S 11/2 50/37/44/-2/0/446/73 29 NE 11/3 46/40/43/-3/0.95/000/00 51 N Aero 50 MPH NNW 11/4 54/37/46/0/0/503/82 33 W Aero 33 MPH W 11/5 56/40/48/+3/0/483/79 29 SE 11/6 53/37/45/0/0.75/000/00 35 SSE Aero 35 MPH SSE 11/7 50/32/41/-4/0/551/91 30 W 11/8 43/28/36/-8/0/494/82 22 W 11/9 44/32/38/-6/N/A/331/55 21 NNE 11/10 39/28/34/-10/N/A/383/64 32 N 11/11 42/24/33/-10/0/590/99 23 WNW 11/12 42/27/35/-8/0.02/024/04 25 SSE 11/13 55/42/49/+6/0.33/308/52 28 S 11/14 58/41/50/+8/0/.../.. 37 S 11/15 64/40/52/+10/../.../.. 44 SSE Aero 46 MPH SSE 11/16 44/30/37/-5/../.../.. 51 W Aero 54 MPH W 11/17 morning low temp. 28F; normal low is now 34F NEW DAILY RECORDS FOR NOVEMBER 2007: NONE DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 17 HIGH 74 IN 1928 LOW 10 IN 1924 PRECIP 1.92 INCHES IN 1920 SNOWFALL 1.0 INS IN 1980 PEAK GUST 61 SSE IN 2006 RECORDS FOR NOVEMBER 18 HIGH 72 IN 1963 LOW 10 IN 1936 PRECIP 1.80 INS IN 1929 SNOWFALL 6.3 INS IN 1980 PEAK GUST 60 SW IN 1987 TODAY'S REPORT PREPARED By: Mike Iacono