BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, DECEMBER 13, 2007
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Overcast altocumulus, breaks NNW-ENE and
ESE-SE, thin spots in overcast overhead
Temperature: 22F, Dew point: 9F, Wind: NNW at 8 kts
Sea-level pressure: 30.33 inches Hg, rising
Visibility: 35 miles
6-hour min temp: 22F
24-hour precip: trace  
24-hour snowfall: 0.00 
Snow and ice on ground: trace
BHO SA 1155 E140 OVC 35 273/22/9/3408/033/
BINOVC NNW-ENE AND ESE-SE THN SPTS IOVC OVHD/
8/07/ 51011 10026 20022 
 
10 A.M.
Weather: Overcast altostratus, few stratus fractus,
few stratocumulus NE-SE
Temperature: 23F, Dew point: 9F, Wind: E at 7 kts
Sea-level pressure: 30.32 inches Hg, falling
Visibility: 35 miles 
BHO SA 1455 E120 OVC 35 268/23/9/0807/032/
FEW STFRA FEW SC NE-SE/ 8/52/ 58005
 
1 P.M.
Weather: Sky obscured with heavy snow
Temperature: 22F, Dew point: 16F, Wind: W at 5 kts
Sea-level pressure: 30.24 inches Hg, falling
Visibility: 1/4 mile, heavy snow  
6-hourly snowfall: 0.4 in.
6-hourly max. temp: 24F
BHO SA 1755 W5 X 1/4S+ 240/22/16/2705/024/ 8/7//
SB13 SNOINC1 TOTAL NEW SNW PST 6 HRS 0.4 INS/ 56028
MANUAL 600X ASOS 60002 10024 20022
 
WEATHER SUMMARY FOR WEDNESDAY, DECEMBER 12
 
TEMPERATURE (DEGREES F)
MAX.....44    NORMAL.....39
MIN.....27    NORMAL.....25
MEAN....36    NORMAL.....32
DEPARTURE FROM 30-YEAR NORMAL...........+4
TOTAL DEPARTURE FOR THE MONTH..........-83 [-7.1 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............29  DEPARTURE......- 4 
TOTAL HEATING UNITS FOR THE MONTH...........455  DEPARTURE......+80
TOTAL HEATING UNITS FOR THE SEASON.........1535  DEPARTURE.....-124
TOTAL HEATING UNITS LAST SEASON TO DATE....1379  DIFFERENCE....+156
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............39  W  AT  1:34 P.M.              
                   AEROVANE.............39  W  AT  2:10 P.M. *        
                   ASOS.................38  W  AT  1:34 P.M.               
                   DAVIS................39 WSW AT 12:50 P.M.                
FASTEST MILE FOR YESTERDAY..............28  W  AT 12:55 P.M. *         
MAXIMUM 2-MINUTE ASOS AVERAGE...........26 WNW AT  2:11 P.M.            
MAXIMUM 2-MINUTE DAVIS AVERAGE..........30  W  AT  2:10 P.M.              
AVERAGE WIND SPEED AND DIRECTION........16.3 W 
                   ASOS.................15.5        
                   DAVIS................16.9 WSW [257 deg] #    
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace  DEPARTURE....-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.00  DEPARTURE....-0.79
                         ASOS..............0.99 
TOTAL PRECIPITATION FOR THE YEAR..........39.84  DEPARTURE....-8.61
                         ASOS.............39.21  
 
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.....-0.5
TOTAL SNOWFALL FOR THE SEASON...............3.5  DEPARTURE.....-2.6
 
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 morning low temp. 22F; normal low is now 24F
 
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 13
HIGH 60 IN 1984
LOW 0 IN 1893
PRECIP 1.45 INS. IN 1983
SNOWFALL 9.0 INS. IN 1902
PEAK GUST 81e WNW IN 1976
 
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
 
TODAY'S REPORT PREPARED By: Stephanie Radner