BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 12, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WEEKEND SNOWSTORM BROUGHT 6.2 INCHES
ON SATURDAY-SUNDAY
 
Snow which began Saturday evening totaled 5.0
inches by 7 a.m. Sunday, 6.0 inches by 1 p.m.
and the final flurries brought another 0.2
inch during the afternoon. A period of light
snow early this morning left behind 0.3 inch
by 7 a.m. and another 0.2 inch after that for
a total of a half inch today.  Total melted
precipitation was 0.67 inch. 
 
7 A.M.
Weather: Overcast nimbostratus, very light snow occurring,
thin fog
Temperature: 19F, Dew point: 18F, Wind: WNW at 7 kts
Sea-level pressure: 30.01 inches Hg, rising 
Visibility: 10 miles, light snow, thin fog
6-hour minimum temperature: 19F
24-hour precip: 0.11 in.
24-hour snowfall: 1.5 ins.
Snow depth on ground: 8 inches
BHO SA 1155 E35 OVC 10S- 162/19/18/2907/001/ THN FG PCPN VRY LGT TOTAL 
NEW SNW PST 24 HRS 1.5 INS/ 8/02/ 4/008 53010 MANUAL 6002/ ASOS 60001
MANUAL 70011 ASOS 70015 10022 20019
 
10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus/altocumulus
lenticularis (west, scattered cirrus, sky clearing past hour,
snow ended at 9:20 a.m. 
Temperature: 22F, Dew point: 15F, Wind: WNW at 10 kts
Sea-level pressure: 30.07 inches Hg, rising
Visibility: 25 miles, hazy, northeast thru southeast 15 miles,
west-northwest 45 miles
3-hourly precip: 0.01
3-hourly snowfall: 0.2 in.
BHO SA 1455 40 SCT 80 SCT 250 SCT 25 183/22/15/2910/007/ ACSL W 
SKY CLRG PST HR HAZY VSBY NE-SE 15 WNW 45 SE20 NEW SNW PST 3 HRS 
0.2 IN / 8/541 51022 6001/

1 P.M.
Weather: Clear, few stratocumulus northwest, stratocumulus
layer distant NNE-E, few moderate cumuloform tops distant east
Temperature: 26F, Dew point: 14F, Wind: WNW at 14G20 kts
Sea-level pressure: 30.09 inches Hg, rising
Visibility: 50 miles, light haze
6-hour maximum temperature: 27F
6-hour snowfall: 0.2 inch
6-hour precipitation: 0.01 inch
BHO SA 1755 CLR 50 189/26/14/2914G20/009/ FEW SC NW SC LYR DSNT OFFSHR 
NNE-E FEW MDT CUFRM TOPS DSNT E LGT HZ/ ASOS 60001 MANUAL 6001/
8/500 51005 10027 20019 
 
WEATHER SUMMARY FOR SUNDAY, JANUARY 11
 
TEMPERATURE (DEGREES F)
MAX.....31    NORMAL.....34 
MIN.....19    NORMAL.....18
MEAN....25    NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL...............-1
TOTAL DEPARTURE FOR THE MONTH..............-25  [-2.5 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............40  DEPARTURE.........+1
TOTAL HEATING UNITS FOR THE MONTH............449  DEPARTURE........+26
TOTAL HEATING UNITS FOR THE SEASON..........2689  DEPARTURE........-63
TOTAL HEATING UNITS LAST SEASON TO DATE.....2497  DIFFERENCE......+192
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............30  NW AT 11:27 A.M. 
                   AEROVANE.............28  NW AT 11:27 A.M. 
                   ASOS.................30 NNW AT 11:27 A.M.     
                   DAVIS................32  NW AT 11:27 A.M.      
FASTEST MILE FOR YESTERDAY..............19  NW AT 11:43 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........22 NNW AT 10:08 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........20  NW AT 11:44 A.M.         
                   AVERAGE............11.2  NW
                   ASOS...............10.9
                   DAVIS..............10.7   N [350 deg]  
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.11  DEPARTURE.........-0.05
                         ASOS...............0.15
TOTAL PRECIPITATION FOR THE MONTH...........1.99  DEPARTURE.........+0.31
                         ASOS...............2.97 #
TOTAL PRECIPITATION FOR THE YEAR............1.99  DEPARTURE.........+0.31
                         ASOS...............2.97 #
# Includes erroneous ASOS precipitation data on 1/1/09 and 1/2/09
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........1.5   DEPARTURE.........+1.0
TOTAL SNOWFALL FOR THE MONTH................7.4   DEPARTURE.........+1.9
TOTAL SNOWFALL FOR THE SEASON..............37.8   DEPARTURE........+18.7
 
PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2009 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
 
1/1  16/1/9/-18/0/0/538/98          44 WNW   Aero 44 MPH WNW
1/2  32/9/21/-6/0/0/005/01          28 S
1/3  32/21/27/0/T/T/539/98          43 WNW   Aero 44 MPH WNW
1/4  35/17/26/-1/0/0/512/93         36 W     Aero 33 MPH W
1/5  36/26/31/+4/0.06/0/512/93      30 W   
1/6  33/21/27/+1/0/0/183/33         27 W 
1/7  36/26/31/+5/1.27/0.9/000/00    46 NE 
1/8  38/21/30/+4/0/0/389/70         47 W
1/9  25/16/21/-5/0/0/.../..         37 W
1/10 24/11/18/-8/.../../.../..      28 W
1/11 31/19/25/-1/.../../.../..      30 NW
 
1/12 morning low temp: 19F; our normal low is now 18F
     there was 0.3 snowfall before 7 a.m. 
 
NEW DAILY RECORDS FOR JANUARY 2009...
 
..NONE..
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 12
HIGH 57F IN 1913, 1975
LOW -15F IN 1886
PRECIP 1.46 INS. IN 1900
SNOW 6.0 INS. IN 1923
WIND 84e MPH S IN 1980
 
RECORDS FOR JANUARY 13
HIGH 57F IN 1890,1932
LOW -10F IN 1912,1914
PRECIP 1.54 INS. IN 1979
SNOWFALL 12.6 INS. IN 1964
PEAK GUST 74 MPH NE IN 1964
 
TODAY'S REPORT PREPARED By: Robert Skilling