BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 19, 2008 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Very light snow was observed here on Great Blue
Hill beginning at 12:40PM.  Only very light snow
pellets are falling as of 1:00PM.  The pressure
has dropping rapidly beginning before noon.
 
7 A.M.
Weather: Overcast cirrostratus, line of stratocumulus
along horizon NE-E
Temperature: 25F, Dew point: 19F, Wind: NW at 8 kts
Sea-level pressure: 30.27 inches Hg, rising
Visibility: 15 miles, thin fog
6-hour minimum temperature: 25F
BHO SA 1155 E220 OVC 15 250/25/19/3308/027/
FEW SC ALNG HRZN NE-E THN FG/ 8/537 53002 10028 20025
 
10 A.M.
Weather: Overcast cirrostratus, few stratocumulus
distant NE-S, few altocumulus SE-W, sun dimly visible
Temperature: 27F, Dew point: 18F, Wind: WNW at 6 kts
Wind: Light and variable
Sea-level pressure: 30.28 inches Hg, rising
Visibility: 15 miles, light haze
BHO SA 1455 E200 OVC 15 255/27/18/3406/028/ FEW SC DSNT NE-S
AC SE-W SUN DMLY VSBL LGT HZ WND LGT AND VRB/ 8/557 51005
 
1 P.M.
Weather: Overcast stratus, light snow
Temperature: 27F, Dew point: 21F, Wind: NNE at 9 kts
Wind: Direction variability: NW-NE
Sea-level pressure: 30.13 inches Hg, falling rapidly
Visibility: 15 miles
6 hour maximum temperature: 28F
3 hour snowfall: Trace
BHO SA 1755 E20 OVC 15S- 204/27/21/0209/013/
SB40 PCPN VRY LGT WND 32V04 PRESFR/
8/6// 58051 MANUAL 6000/ 10028 20024
 
WEATHER SUMMARY FOR THURSDAY, DECEMBER 18
 
TEMPERATURE (DEGREES F)
MAX.....37    NORMAL.....38
MIN.....28    NORMAL.....23
MEAN....33    NORMAL.....30
 
DEPARTURE FROM 30-YEAR NORMAL...............+3
TOTAL DEPARTURE FOR THE MONTH..............+56 [+2.9 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............32  DEPARTURE.........-2
TOTAL HEATING UNITS FOR THE MONTH............520  DEPARTURE........-51
TOTAL HEATING UNITS FOR THE SEASON..........1770  DEPARTURE........-90
TOTAL HEATING UNITS LAST SEASON TO DATE.....1771  DIFFERENCE........-1
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............23 WSW AT  1:23 P.M.  
                   AEROVANE.............23 WSW AT  1:23 P.M.
                   ASOS.................23  W  AT  1:23 P.M.  
                   DAVIS................22 WSW AT 12:52 P.M.
FASTEST MILE FOR YESTERDAY..............18 WSW AT  1:35 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........17  W  AT  1:35 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE..........16  W  AT  1:02 P.M.
                   AVERAGE............10.6 WSW
                   ASOS...............10.9
                   DAVIS...............9.4 N/A [N/A deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00   DEPARTURE.......-0.14
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........5.12   DEPARTURE.......+2.49
                         ASOS...............5.33
TOTAL PRECIPITATION FOR THE YEAR...........55.41   DEPARTURE.......+6.12
                         ASOS..............58.34 #
# 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.....-0.4
TOTAL SNOWFALL FOR THE MONTH................2.8  DEPARTURE.....-2.7
TOTAL SNOWFALL FOR THE SEASON...............2.8  DEPARTURE.....-5.6
 
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/0.0/122/22       42 SSW   Aero 43 MPH S
12/5  38/26/32/-3/0.00/0.0/404/73    26 WNW
12/6  37/23/30/-4/0.00/0.0/309/56    21 S
12/7  32/20/26/-8/0.12/1.6/000/00    54 W     Aero 53 MPH W
12/8  21/10/16/-17/0.00/0.0/462/84   50 W     Aero 50 MPH W
12/9  53/13/33/0/0.01/T/000/00       48 S     Aero 50 MPH S
12/10 60/37/49/+16/0.43/0.0/000/00   55 S     Aero 58 MPH S
12/11 37/34/36/+4/1.52/T/000/00      38 NNE   Aero 35 MPH NNE
12/12 61/28/45/+13/2.32/0.0/088/16   75 SSE   Aero 76 MPH SSE
12/13 28/17/23/-9/0.00/0.0/531/97    33 W
12/14 43/17/30/-1/0.00/0.0/.../..    36 S
12/15 61/43/52/+21/T/0.0/.../..      55 S     Aero 56 MPH S
12/16 57/26/42/+11/.../../000/00     43 W
12/17 38/25/32/+1/.../../000/00      26 E     Aero 22 MPH E
12/18 37/28/33/+3/0.00/0.0/.../..    23 WSW
 
12/19 morning low temp through 8AM: 24F; our normal low temp. 23F
 
NEW DAILY RECORDS FOR DECEMBER 2008...
 
12/12 PEAK GUST 75 MPH SSE; PREVIOUS 74 MPH W IN 2000
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR DECEMBER 19
HIGH 59 IN 1899
LOW -1 IN 1919
PRECIP 2.06 INS. IN 1986
SNOWFALL 14.1 INS. IN 1945
PEAK GUST 68 NE IN 1986
 
RECORDS FOR DECEMBER 20
HIGH 61 IN 1957
LOW -16 IN 1942
PRECIP 1.69 INS. IN 1936
SNOWFALL 8.3 INS. IN 1995
PEAK GUST 75 MPH S IN 2002
 
TODAY'S REPORT PREPARED By: Stephanie Radner