BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, NOVEMBER 21, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME   FOGGED IN ALL DAY WITH SLOWLY RISING TEMPS.   A little early morning black ice quickly melted away as the summit remained in dense fog all day with the visibility down to zero for a time. There has been no precipitation at least through early afternoon. Temperatures have been rising slowly through the 30's.   Today's observations:   7 A.M.   Weather: Obscurement with heavy fog Temperature: 32F, Dew point: 32F, Wind: NNE at estimated 02 kts Sea-level pressure: 30.11 inches Hg, rising Visibility: 1/16 mile 6-hour min temp: 32F 24-hour precip: 0.09 in.; snowfall 0.7 in. BHO SA 1155 W1 X 1/16F 196/32/32/E0202/011/ PTCHS BLACK ICE WOOD/METAL SFCS TOTAL NEW SNW PST 24 HRS 0.7 IN/ 8//// 53008 ASOS 70010 MANUAL 70009 10033 20032   10 A.M.   Weather: Obscurement with heavy fog   Temperature: 36F, Dew point: 36F, Wind: SSE at 08 kts Sea-level pressure: 30.11 inches Hg, steady  Visibility: 0 mile 3-hour precip: 0.00 BHO SA 1455 W1 X 0F 196/36/36/1508/011/ 8//// 58000   1 P.M.   Weather: Obscurement, heavy fog Temperature: 38F, Dew point: 38F, Wind: SE at 03 kts Sea-level pressure: 30.06 inches Hg, falling  Visibility: 1/16 mile,  6-hourly precip: 0.00 6-hourly max. temp. 38F BHO SA 1755 W1 X 1/16F 180/38/38/1403/006/ 8//// 56016 10038 20032   WEATHER SUMMARY FOR TUESDAY, NOVEMBER 20   TEMPERATURE (DEGREES F) MAX.....37    NORMAL.....48 MIN.....29    NORMAL.....33 MEAN....33    NORMAL.....40 DEPARTURE FROM 30-YEAR NORMAL...........-7 TOTAL DEPARTURE FOR THE MONTH..........-50 [-2.7 DEGREES/DAY]   HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............32  DEPARTURE.......+7 TOTAL HEATING UNITS FOR THE MONTH...........480  DEPARTURE......+49 TOTAL HEATING UNITS FOR THE SEASON..........826  DEPARTURE.....-196 TOTAL HEATING UNITS LAST SEASON TO DATE.....850  DIFFERENCE.....-24   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............22 SE  AT  3:58 P.M. *                        AEROVANE.............21 SE  AT  3:58 P.M.                         ASOS.................18 SE  AT  5:25 P.M.                         DAVIS................22 SE  AT  3:54 P.M.        FASTEST MILE FOR YESTERDAY..............16 SE  AT  4:33 P.M.          MAXIMUM 2-MINUTE ASOS AVERAGE...........18 SE  AT  4:33 P.M.     MAXIMUM 2-MINUTE DAVIS AVERAGE..........18 SE  AT  4:33 P.M.     AVERAGE WIND SPEED AND DIRECTION...... 9.2 SE                    ASOS............... 9.2                     DAVIS.............. 9.6 ESE [120 deg]    * last of several occurrences...   PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.09  DEPARTURE....-0.07                          ASOS..............0.10 TOTAL PRECIPITATION FOR THE MONTH..........3.01  DEPARTURE....-0.11                          ASOS..............3.00  TOTAL PRECIPITATION FOR THE YEAR..........38.55  DEPARTURE....-6.59                          ASOS.............37.83     SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.7  DEPARTURE.....+0.6 TOTAL SNOWFALL FOR THE MONTH................0.8  DEPARTURE.....-0.8 TOTAL SNOWFALL FOR THE SEASON...............0.8  DEPARTURE.....-1.0    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/.../..         37 S 11/15 64/40/52/+10/0.41/.../..     44 SSE Aero 46 MPH SSE 11/16 44/30/37/-5/0.31/.../..      51 W   Aero 54 MPH W 11/17 40/28/34/-7/0/.../..         37 W 11/18 41/29/35/-6/0/.../..         25 ENE 11/19 36/30/33/-8/0.01/0.1/000/00  29 N 11/20 37/29/33/-7/0.09/0.7/000/00  22 SE   11/21 morning low temp. 32F; normal low is now 33F        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 21 HIGH 69 IN 1931 LOW 10 IN 1888 PRECIP 2.60 INCHES IN 1950 SNOWFALL 4.0 INS IN 1929 PEAK GUST 69 NW IN 1989   RECORDS FOR NOVEMBER 22 HIGH 70 IN 1931 LOW 12 IN 1987 PRECIP 1.78 INS IN 2005 SNOWFALL 9.0 INS IN 1971 PEAK GUST 70e SE IN 1945   TODAY'S REPORT PREPARED By: Robert Skilling