BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, DECEMBER 9, 2007
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Broken altocumulus
Temperature: 27F, Dew point: 19F, Wind: S at 07 kts
Sea-level pressure: 30.46 inches Hg, rising
Visibility: 25 miles
6-hour min temp: 25F
24-hour precip: 0.00  
24-hour snowfall: 0.0 
Snow on ground: 1 inch 
BHO SA 1155 100 BKN 25 315/27/19/1907/046/
FEW SC DSNT NE-E WND L/V/ 8/470 4/001 51015 10027 20025
 
10 A.M.
Weather: Overcast altocumulus
Temperature: 30F, Dew point: 19F, Wind: WSW at 07 kts
Sea-level pressure: 30.49 inches Hg, rising
Visibility: 35 miles
BHO SA 1455 100 OVC 35 326/30/19/2507/049/ FEW BRGT SPTS IOVC SE 
WND L/V/ 8/4// 51011
 

WEATHER SUMMARY FOR SATURDAY, DECEMBER 8
 
TEMPERATURE (DEGREES F)
MAX.....41    NORMAL.....41
MIN.....25    NORMAL.....26
MEAN....33    NORMAL.....33
DEPARTURE FROM 30-YEAR NORMAL............0
TOTAL DEPARTURE FOR THE MONTH..........-75 [-9.2 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............33  DEPARTURE......+ 1
TOTAL HEATING UNITS FOR THE MONTH...........317  DEPARTURE......+76
TOTAL HEATING UNITS FOR THE SEASON.........1397  DEPARTURE.....-133
TOTAL HEATING UNITS LAST SEASON TO DATE....1266  DIFFERENCE....+131
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............32  W   AT 6:12 P.M.            
                   AEROVANE.............30  W   AT 6:12 P.M.      
                   ASOS.................30  W   AT 6:13 P.M.            
                   DAVIS................32  WSW AT 6:12 P.M.             
FASTEST MILE FOR YESTERDAY..............23  WSW AT 1:00 P.M.            
MAXIMUM 2-MINUTE ASOS AVERAGE...........22  W   AT 1:01 P.M.        
MAXIMUM 2-MINUTE DAVIS AVERAGE..........23  W   AT 1:01 P.M.           
AVERAGE WIND SPEED AND DIRECTION.......11.9 W 
                   ASOS................11.2      
                   DAVIS...............12.6 WSW [250 deg]    
 
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..........0.72  DEPARTURE....-0.48
                         ASOS..............0.73 
TOTAL PRECIPITATION FOR THE YEAR..........39.56  DEPARTURE....-8.30
                         ASOS.............38.95  
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.3
TOTAL SNOWFALL FOR THE MONTH................2.7  DEPARTURE.....+0.7
TOTAL SNOWFALL FOR THE SEASON...............3.5  DEPARTURE.....-1.4
 
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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
 
12/1 33/15/24/-12/0/0/493/88       54 WNW
12/2 24/15/20/-16/0.03/0.3/000/00  28 WNW
12/3 38/23/31/-4/0.62/1.7/000/00   47 W
12/4 27/17/22/-13/T/T/106/19       48 W      
12/5 29/17/23/-12/T/T/239/43       23 WNW
12/6 28/15/22/-12/0/0/554/100      31 WNW
12/7 34/21/28/-6/0.07/0.7/.../..   24 SSW
12/8 41/25/33/0/0.00/0.0/.../..    32 W
 
NEW DAILY RECORDS FOR DECEMBER 2007: NONE
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 1.52 INCHES IN 1956
SNOWFALL 10.8 INCHES IN 2005
PEAK GUST 66 SE IN 1973
 
RECORDS FOR DECEMBER 10
HIGH 62 IN 1946
LOW -6 IN 1902
PRECIP 1.67 INCHES IN 1907
SNOWFALL 6.0 INCHES IN 1905
PEAK GUST 66e SW IN 1940

TODAY'S REPORT PREPARED By: Andrew Hoell