BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 14, 2007
ALL TIMES ARE IN EASTERN STANDARD TIME
 
RECORD DAILY SNOWFALL FOR DECEMBER 13
 
Snow began falling yesterday just a few minutes after 
12:00 noon, and fell at a rate of over one inch per 
hour through early evening.  Total accumulation on the 
summit was 9.4 inches, with 9.2 inches falling on 
December 13 and 0.2 inches falling on December 14. 
 
The total snowfall for December 13 of 9.2 inches just
surpassed the daily record of 9.0 inches for that date, 
previously set in 1902.
 
Today's observations:
 
7 A.M.   
Weather: Sky obscured with fog
Temperature: 20F, Dew point: 19F, Wind: SW at 7 kts
Sea-level pressure: 30.04 inches Hg, falling
Visibility: 3 miles, fog
6-hour min temp: 20F 
24-hour precip: 1.10 inches   
24-hour snowfall: 9.4 inches  
Snow and ice on ground: 9 inches 
BHO SA 1155 W4 X 3F 173/20/19/2307/004/ TOTAL NEW SNW PST 24 HRS 
9.4 INS THN RIME/ 8//// 4/009 56001 MANUAL 6002/ ASOS 60002 
MANUAL 70110 ASOS 70129 10023 20020
 
10 A.M.
Weather: Broken cirrus
Temperature: 26F, Dew point: 23F, Wind: SW at 7 kts
Sea-level pressure: 30.05 inches Hg, rising
Visibility: 10 miles, fog
BHO SA 1455 E250 BKN 10 176/26/23/2207/005/ PTCHS DENSE CI THN F 
CLRNG W-N/ 8/002 53003
 
1 P.M.
Weather: Broken altocumulus, cirrus
Temperature: 35F, Dew point: 30F, Wind: SW at 13G23 kts
Sea-level pressure: 30.03 inches Hg, falling
Visibility: 15 miles, hazy   
6-hourly max. temp: 35F
BHO SA 1755 E130 BKN 250 BKN 15 170/35/30/2313G23/003/ HZY/ 
8/032 56006 10035 20020
 
WEATHER SUMMARY FOR THURSDAY, DECEMBER 13
 
TEMPERATURE (DEGREES F)
MAX.....29    NORMAL.....39 
MIN.....20    NORMAL.....24
MEAN....25    NORMAL.....32
DEPARTURE FROM 30-YEAR NORMAL...........-7 
TOTAL DEPARTURE FOR THE MONTH..........-90 [-7.1 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............40  DEPARTURE.......+7  
TOTAL HEATING UNITS FOR THE MONTH...........495  DEPARTURE......+87 
TOTAL HEATING UNITS FOR THE SEASON.........1575  DEPARTURE.....-117
TOTAL HEATING UNITS LAST SEASON TO DATE....1400  DIFFERENCE....+175
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............24 ENE AT  9:02 P.M.               
                   AEROVANE.............22 NE  AT  9:33 P.M. *         
                   ASOS.................23 ENE AT  9:33 P.M.                
                   DAVIS................21 ENE AT  9:02 P.M.                 
FASTEST MILE FOR YESTERDAY..............16 ENE AT  9:08 P.M.           
MAXIMUM 2-MINUTE ASOS AVERAGE...........17 E   AT  9:10 P.M.             
MAXIMUM 2-MINUTE DAVIS AVERAGE..........16 ENE AT  9:10 P.M.               
AVERAGE WIND SPEED AND DIRECTION........8.3 NNW  
                   ASOS.................8.2         
                   DAVIS................8.3 N [353 deg]     
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.10  DEPARTURE....+0.96
                         ASOS..............1.29 
TOTAL PRECIPITATION FOR THE MONTH..........2.10  DEPARTURE....+0.17
                         ASOS..............2.28  
TOTAL PRECIPITATION FOR THE YEAR..........40.94  DEPARTURE....-7.65
                         ASOS.............40.50  
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........9.4  DEPARTURE.....+9.1
TOTAL SNOWFALL FOR THE MONTH...............12.1  DEPARTURE.....+8.6
TOTAL SNOWFALL FOR THE SEASON..............12.9  DEPARTURE.....+6.5
 
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/111/20       48 W       
12/5  29/17/23/-12/T/T/244/44       23 WNW
12/6  28/15/22/-12/0/0/554/100      31 WNW
12/7  34/21/28/-6/0.07/0.7/000/00   24 SSW
12/8  41/25/33/0/0/0/452/82         32 W
12/9  33/25/29/-4/0.08/T/000/00     16 NW  
12/10 30/26/28/-5/0.10/0/000/00     18 N 
12/11 36/22/29/-3/0.09/0/.../..     25 S
12/12 44/22/36/+4/T/0/.../..        39 W
12/13 29/20/25/-7/1.08/9.2/000/00   24 ENE
 
12/14 morning low temp. 20F; normal low is now 24F
 
NEW DAILY RECORDS FOR DECEMBER 2007: 
Daily snowfall for December 13: 9.2 inches, surpassing 
the previous record of 9.0 inches in 1902.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR DECEMBER 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941
 
RECORDS FOR DECEMBER 15
HIGH 64 IN 1975
LOW 4 IN 1900, 1905, 1933
PRE 1.80 INS. IN 1981
SNOW 7.5 INS. IN 1951
PEAK GUST 65 MPH NW IN 1991
 
TODAY'S REPORT PREPARED By: Stephanie Radner