BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 4, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME 

RECORD HIGH TEMPERATURE 67F FOR YESTERDAY'S DATE

The temperature reached 67F yesterday, surpassing
the old record for the date of 61F which occurred 
in 1932 and 1950. 

Yesterday's summary erroneously reported that the 
previous record of 61F for December 3 occurred in 
1998.  The years listed above (1932 and 1950) are
the correct years for the old record.  

Today's observations:

7 A.M. 
Weather: Clear, few stratocumulus distant NE-E
Temperature: 41F, Dew point: 34F, Wind: W at 11 kts
Sea-level pressure: 29.97 inches Hg, rising
Visibility: 35 miles
6-hour minimum temp: 40F 
24-hour precipitation: 0.17 in.
BHO SA 1155 CLR 35 150/41/34/2811/997/ FEW SC DSNT NE-E/ 
8/500 51025 MANUAL 70017 ASOS 70022 10045 20040

10 A.M. 
Weather: Clear, few stratocumulus distant NE, 
few cirrus all quadrants
Temperature: 48F, Dew point: 33F, Wind: W at 9 kts
Wind: Variable direction WSW to SW
Sea-level pressure: 30.07 inches Hg, rising 
Visibility: 60 miles
BHO SA 1455 CLR 60 183/48/33/2709/007/ 
FEW SC DSNT NE FEW CI ALQDS WND 24V32/ 8/501 51033

1 P.M. 
Weather: Thin scattered cirrus
Temperature: 51F, Dew point: 30F, Wind: WSW at 7 kts,
Wind: Direction variable SSW to W
Sea-level pressure: 30.04 inches Hg, falling
Visibility: 70 miles
6-hour maximum temp: 52F
BHO SA 1755 250 –SCT 70 176/51/30/2407/004/ WND 21V28/ 
8/001 56007 10052 20041

WEATHER SUMMARY FOR THURSDAY, DECEMBER 3

TEMPERATURE (DEGREES F)
MAX.....67     NORMAL.....43
MIN.....47     NORMAL.....28
MEAN....57     NORMAL.....35
 
DEPARTURE FROM 30-YEAR AVERAGE............+22
TOTAL DEPARTURE FOR THE MONTH.............+27  [+8.8 DEGREES/DAY]

HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY.............8    DEPARTURE.......-22
TOTAL HEATING UNITS FOR THE MONTH............61    DEPARTURE.......-27
TOTAL HEATING UNITS FOR THE SEASON.........1221    DEPARTURE......-134
TOTAL HEATING UNITS LAST SEASON TO DATE....1317    DIFFERENCE......-96

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.............69 SSE AT  7:00 A.M.    
                   AEROVANE..............73 SSE AT  7:00 A.M. *
                   ASOS..................72 S   AT  7:00 A.M.   
                   DAVIS................ 72 SSW AT  7:52 A.M.    
THE FASTEST MILE FOR YESTERDAY...........54 SSE AT  7:32 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............48 S   AT  7:31 A.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE...........49 S   AT  7:54 A.M.     
AVERAGE WIND SPEED AND DIRECTION.........24.1 WSW
                   ASOS..................23.5
                   DAVIS.................22.6 SSW [199 DEG] 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.17   DEPARTURE....+0.02
                         ASOS..............0.22
TOTAL PRECIPITATION FOR MONTH..............1.09   DEPARTURE....+0.64
                         ASOS..............1.17 
TOTAL PRECIPITATION FOR THE YEAR..........50.66   DEPARTURE....+3.55
                         ASOS.............50.98
			
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.2
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE.....-0.4
TOTAL SNOWFALL FOR THE SEASON...............3.0  DEPARTURE.....-0.3
	 							
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/1  41/28/35/-1/0/0/.../..    29 NW  
12/2  51/33/42/+6/.../.../..    30 SSE
12/3  67/47/57/+22/.../.../..   69 SSE  AERO 73 SSE

12/4  our morning low temp: 40F; the normal low temp. is now 28F

NEW DAILY RECORD FOR DECEMBER 2009
12/3 NEW RECORD HIGH MAXIMUM TEMPERATURE of 67F; 
     surpasses previous record of 61F in 1932, 1950.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR DECEMBER 4
HIGH 67 IN 1998
LOW -4 IN 1940
PRECIP 1.87 INS. IN 1968
SNOWFALL 6.0 INS. IN 1907
PEAK GUST 73 MPH WNW IN 1980

RECORDS FOR DECEMBER 5
HIGH 65 IN 2001
LOW -1 IN 1926
PRECIP 2.86 INS. IN 1993
SNOWFALL 7.0 INS. IN 1926 and 1981
PEAK GUST 67 MPH WNW IN 1961, S IN 1973

TODAY'S REPORT PREPARED BY: Stephanie Radner