BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, DECEMBER 30, 2007
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Thin scattered cirrus
Temperature: 30F, Dew point: 23F, Wind: WSW at 12 kt
Sea-level pressure: 30.13 inches Hg, rising
Visibility: 25 miles
6-hour min temp: 30F
24-hour precip: 0.05 inches
Snow on ground: Trace (patchy snow cover)
BHO SA 1155 250 -SCT 25 202/30/23/2412/013/ 8/001 53014 70005 10034 20030
 
10 A.M.
Weather: Thin overcast cirrus
Temperature: 34F, Dew point: 24F, Wind: WSW at 8 kt
Sea-level pressure: 30.23 inches Hg, rising
Visibility: 40 miles
BHO SA 1455 250 -OVC 40 238/34/24/3208/023/ 8/001 53026
 
WEATHER SUMMARY FOR SATURDAY, DECEMBER 29
 
TEMPERATURE (DEGREES F)
MAX.....45    NORMAL.....35
MIN.....34    NORMAL.....20
MEAN....40    NORMAL.....28
DEPARTURE FROM 30-YEAR NORMAL..........+12
TOTAL DEPARTURE FOR THE MONTH..........-52 [-1.6 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............25  DEPARTURE......-12
TOTAL HEATING UNITS FOR THE MONTH..........1025  DEPARTURE......+59
TOTAL HEATING UNITS FOR THE SEASON.........2105  DEPARTURE.....-150
TOTAL HEATING UNITS LAST SEASON TO DATE....1800  DIFFERENCE....+305
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............32 SE AT 7:24 A.M. 
                   AEROVANE.............33 SE AT 7:25 A.M.
                   ASOS.................31 S  AT 7:25 A.M.
                   DAVIS................33 SE AT 6:09 A.M.
FASTEST MILE FOR YESTERDAY..............25 SE AT 7:24 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........24 S  AT 7:25 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........26 SE AT 7:25 A.M.  
AVERAGE WIND SPEED AND DIRECTION......14.1 SSW  
                   ASOS...............13.0        
                   DAVIS..............14.3 SSW [202 deg]       
* Last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05  DEPARTURE....-0.10
                         ASOS..............0.08
TOTAL PRECIPITATION FOR THE MONTH..........6.27  DEPARTURE....+2.01
                         ASOS..............6.36 
TOTAL PRECIPITATION FOR THE YEAR..........45.11  DEPARTURE....-5.81
                         ASOS.............44.58  
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.4
TOTAL SNOWFALL FOR THE MONTH...............28.2  DEPARTURE....+18.3
TOTAL SNOWFALL FOR THE SEASON..............29.0  DEPARTURE....+16.2
 
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 Aero 57 MPH 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/-3/0.09/0/258/47     25 S
12/12 44/22/36/+4/T/0/88/16         39 W
12/13 29/20/25/-7/1.08/9.2/000/00   24 ENE
12/14 37/20/29/-2/0.02/0.2/038/07   28 WSW
12/15 28/15/22/-9/0/0/.../..        31 WNW 
12/16 43/23/33/+2/1.62/8.5/000/00   54 NE
12/17 32/15/24/-7/0/0/.../..        62 W   Aero 65 MPH W
12/18 31/10/21/-9/0/0/.../..        20 W
12/19 38/24/31/+1/0.04/0/.../..     19 E
12/20 33/26/30/0/0.90/7.4/000/00    24 NNW
12/21 28/22/25/-5/0.03/0.2/000/00   25 N
12/22 32/26/29/0/0/0/.../..         21 ESE
12/23 54/33/44/+15/0.64/0/000/00    65 SE   Aero 70 MPH SE 
12/24 53/32/43/+14/0.01/0/.../..    50 S    Aero 51 MPH S    
12/25 40/29/35/+6/0/0/.../..        32 WSW
12/26 37/26/32/+4/0.22/0/.../..     27 NNE
12/27 36/31/34/+6/0.58/T/000/00     37 NNE
12/28 44/31/38/+10/../../404/74     28 WSW
12/29 45/34/40/+12/../../.../..     32 SE
 
NEW DAILY RECORDS FOR DECEMBER 2007:
Dec 13: Record daily snowfall of 9.2 inches surpasses previous
record of 9.0 inches in 1902.
Dec.16: Record daily snowfall of 8.5 inches surpasses previous
record of 7.0 inches in 1896.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR DECEMBER 30
HIGH 60 IN 1984
LOW -18 IN 1933
PRECIP 1.48 INCHES IN 1891
SNOWFALL 7.5 INCHES IN 1956
PEAK GUST 81 MPH WNW IN 1962
 
RECORDS FOR DECEMBER 31
HIGH 62 IN 1965
LOW -12 IN 1917
PRECIP 0.96 INCHES IN 1906
SNOWFALL 6.0 INCHES IN 1886
PEAK GUST 78 MPH NW IN 1990

TODAY'S REPORT PREPARED By: Andrew Hoell