BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, DECEMBER 6, 2008  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
7 A.M. 
Weather: Thin overcast cirrus, few lower dense cirrus,
few altocumulus, few stratocumulus distant offshore, 
few patches thin ground fog E-W
Temperature: 25F, Dew point: 11F, Wind: NNE at 6 kts
Sea-level pressure: 30.19 inches Hg, rising
Visibility: 45 miles
24 hour precipitation: 0.00
6-hour minimum temperature: 23F
BHO SA 1155 220 –OVC 45 225/25/11/0306/019/ FEW LWR DNS CI 
FEW AC NW-E FEW SC OFFSHR DSNT E-SE FEW PTCHS THN GF E-W 
WND LGT/ 8/571 51003 10025 20023

10 A.M.
Weather: Thin scattered cirrus, few lower cirrus, few
stratocumulus
Temperature: 32F, Dew point: 13F, Wind: S at 4 kts
Sea-level pressure: 30.17 inches Hg, falling
Visibility: 40 miles
BHO SA 1455 250 –SCT 45 218/32/13/1704/017/ FEW LWR CI FEW SC 
DSNT E-ESE WND LGT AND VRB/ 8/501 58007

1 P.M.
Weather: Scattered altocumulus, thin overcast cirrus, few 
stratocumulus E-S, few cumulus fractus all quadrants
Temperature: 36F, Dew point: 15F, Wind: S at 8 kts
Sea-level pressure: 30.09 inches Hg, falling
Visibility: 70 miles
6 hour maximum temperature: 37F
BHO SA 1755 120 SCT 150 SCT 250 –OVC 70 188/36/15/1708/009/ FEW 
SC E-S FEW CUFRA ALQDS WND LGT AND VRB/ 8/571 58030 10037 20025


WEATHER SUMMARY FOR FRIDAY, DECEMBER 5
  
TEMPERATURE (DEGREES F)
MAX.....38    NORMAL.....42
MIN.....26    NORMAL.....27
MEAN....32    NORMAL.....35

DEPARTURE FROM 30-YEAR NORMAL...............-3
TOTAL DEPARTURE FOR THE MONTH..............+26 [+5.0 DEGREES/DAY] 

HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............33  DEPARTURE.........+3
TOTAL HEATING UNITS FOR THE MONTH............122  DEPARTURE........-26
TOTAL HEATING UNITS FOR THE SEASON..........1372  DEPARTURE........-65
TOTAL HEATING UNITS LAST SEASON TO DATE.....1285  DIFFERENCE.......+87

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............26 WNW AT  1:57 A.M. **
                   AEROVANE.............25 WNW AT  1:57 A.M.
                   ASOS.................26  NW AT  1:57 A.M.
                   DAVIS................28   W AT 12:52 A.M.
FASTEST MILE FOR YESTERDAY..............19   W AT  4:00 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........20  NW AT  1:58 A.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........21   W AT  1:57 A.M.   
                   AVERAGE............10.9   W
                   ASOS................9.9
                   DAVIS..............10.7 WNW [283 deg] 
* Last of several occurrences.
** Peak wind gust and time estimated. 
 
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...........0.12   DEPARTURE.......-0.63
                         ASOS...............0.15
TOTAL PRECIPITATION FOR THE YEAR...........50.41   DEPARTURE.......+3.00
                         ASOS..............53.16 #
# Includes erroneous ASOS precipitation data on 2/13/08.

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.3
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE.....-1.1
TOTAL SNOWFALL FOR THE SEASON.............TRACE  DEPARTURE.....-4.0

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

12/1  59/43/51/+15/0.12/0.0/374/67   43 SSW  
12/2  47/32/40/+4/0.00/0.0/451/81    33 SSW 
12/3  44/29/37/+2/0.00/0.0/556/100   24 SSW
12/4  53/33/43/+8/T/0.0/.../..       42 SSW   Aero 43 MPH S
12/5  38/26/32/-3/0.00/0.0/.../..    26 WNW

12/6  morning low temp. 23F; the normal low is now 27F

NEW DAILY RECORDS FOR DECEMBER 2008...

None to date.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR DECEMBER 6
HIGH 70 IN 2001
LOW 5 IN 1901,1935
PRECIP 2.36 INS. IN 1945
SNOWFALL 12.0 INS. IN 1886, 1981
PEAK GUST 74 MPH NW IN 1981

RECORDS FOR DECEMBER 7
HIGH 74 IN 1998
LOW 6 IN 1906
PRECIP 1.67 INS. IN 1953
SNOWFALL 4.0 INS. IN 1886
PEAK GUST 76e SE IN 1976

TODAY'S REPORT PREPARED By: Mike Iacono