BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, NOVEMBER 24, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME COLDEST TEMPERATURE OF THE SEASON SO FAR THIS MORNING AT 16 DEGREES... The minimum temperature this morning of 16 degrees was the coldest of the season to date, but this is well above the record low of 7 for today recorded in 1897. This is the coldest temperature in November since 13 was measured on November 28, 2002. Visibility is very high at 80 miles today, with the dew point down in the single digits. November is now more than two degrees colder than average. Today's observations: 7 A.M. Weather: Clear with stratocumulus offshore and a few cirrus Temperature: 17F, Dew point: 8F, Wind: WNW at 10 kts Sea-level pressure: 30.42 inches Hg, rising Visibility: 80 miles 6-hour min temp: 16F BHO SA 1155 CLR 80 301/17/8/2910/042/ CI S-WNW SC DSNT OFFSHR NNE-SE/ 8/501 51024 10021 20016 10 A.M. Weather: Clear with stratocumulus offshore and a few cirrus Temperature: 24F, Dew point: 8F, Wind: WNW at 7 kts Sea-level pressure: 30.45 inches Hg, rising Visibility: 80 miles BHO SA 1455 CLR 80 311/24/8/2907/045/ CI DSNT S-WSW AND NW-NE SC DSNT OFFSHR NE-SE WND LGT/ 8/501 53010 1 P.M. Weather: Thin scattered cirrus, few distant stratocumulus Temperature: 30F, Dew point: 7F, Wind: W at 7 kts Wind: variable direction SW-WNW Sea-level pressure: 30.38 inches Hg, falling Visibility: 80 miles 6-hour max temp: 30F BHO SA 1755 250 –SCT 80 287/30/7/2607/038/ FEW SC DSNT ENE-ESE/ 8/501 56024 10030 20017 WEATHER SUMMARY FOR FRIDAY, NOVEMBER 23 TEMPERATURE (DEGREES F) MAX.....40 NORMAL.....46 MIN.....23 NORMAL.....32 MEAN....32 NORMAL.....39 DEPARTURE FROM 30-YEAR NORMAL...........-7 TOTAL DEPARTURE FOR THE MONTH..........-45 [-2.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............33 DEPARTURE.......+7 TOTAL HEATING UNITS FOR THE MONTH...........551 DEPARTURE......+44 TOTAL HEATING UNITS FOR THE SEASON..........897 DEPARTURE.....-201 TOTAL HEATING UNITS LAST SEASON TO DATE.....932 DIFFERENCE.....-35 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............36 W AT 1:33 P.M. AEROVANE.............36 W AT 12:35 A.M. ASOS.................35 WNW AT 1:27 A.M. DAVIS................35 WSW AT 12:36 A.M. FASTEST MILE FOR YESTERDAY..............26 W AT 12:36 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........24 WNW AT 1:34 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........27 W AT 12:37 A.M. AVERAGE WIND SPEED AND DIRECTION.......15.4 W ASOS................14.3 DAVIS.............. 15.9 WNW [282 deg] * Last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.03 DEPARTURE....-0.56 ASOS..............3.04 TOTAL PRECIPITATION FOR THE YEAR..........38.57 DEPARTURE....-7.04 ASOS.............37.87 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE MONTH................0.8 DEPARTURE.....-1.2 [corrected] TOTAL SNOWFALL FOR THE SEASON...............0.8 DEPARTURE.....-1.4 [corrected] PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2007...CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW*/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available * entries for daily snowfall beginning 19th 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/-6/0.09/331/55 21 NNE 11/10 39/28/34/-10/0.05/383/64 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/+8/0/507/86 37 S 11/15 64/40/52/+10/0.41/035/06 44 SSE Aero 46 MPH SSE 11/16 44/30/37/-5/0.31/158/27 51 W Aero 54 MPH W 11/17 40/28/34/-7/0/350/60 37 W 11/18 41/29/35/-6/0/495/85 25 ENE 11/19 36/30/33/-8/0.01/0.1/030/05 29 N ** sunshine data corrected 11/20 37/29/33/-7/0.09/0.7/000/00 22 SE 11/21 48/32/40/0/0.01/0/000/00 21 N 11/22 64/40/52/+12/0.01/0/212/37 36 W 11/23 40/23/32/-7/0/.../.. 36 W 11/24 morning low temp. 16F; normal low is now 32F 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 24 HIGH 69 IN 1931 LOW 7 IN 1897 PRECIP 1.76 INCHES IN 1901 SNOWFALL 4.5 INS IN 1936 PEAK GUST 69 SSW IN 1959 RECORDS FOR NOVEMBER 25 HIGH 71 IN 1979 LOW 13 IN 1938 PRECIP 3.10 INCHES IN 1983 SNOWFALL 8.0 INS IN 1888 PEAK GUST 94e E IN 1950 TODAY'S REPORT PREPARED By: Mike Iacono