BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 16, 2013   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
2.5 INCHES SNOWFALL AS OF 7 A.M.
3.5 INCHES SNOWFALL THROUGH 10 A.M.
 
Snow began between 3 and 4 A.M. this morning and
as of 7 A.M. the measurement was 2.5 inches of snow on the
boards with visibility 1/4 mile in moderate snow and fog.
Total melted; 0.24 inch
The snowfall rate was 1 in. per hour
 
SNOW GOES OVER TO LIGHT FREEZING RAIN/DRIZZLE 
HERE AT THE SUMMIT
 
Snow accumulated another 1.0 inch between 7 A.M.
and 10 A.M.; that was the end of it. A change to
light freezing rain and light freezing drizzle
occurred as snow ended at an unknown time between
9 and 10 A.M.
Marginally light freezing rain to non-freezing rain
was still occurring early this afternoon with only a very
light glaze accumulation. 
It appears that the final snow accumulation for
this event will be 3.5 inches with all of that
falling between 3 A.M. and about 9 A.M. 
 
Today's observations:
 
7 A.M.
Weather: Partial obscurement with overcast stratus, snow and fog
obscuring 7/10 of sky, moderate snow and fog, snow increased
one inch past hour, total new snow past 24 hours 2.5 ins.
Temperature: 30F; Dew Point: 30F; Wind: N at 7 kts
Sea-level pressure: 30.10 ins. Hg, falling then more rapidly  
Visibility: 1/4 miles, moderate snow and fog 
6-hr min. temp: 30F
6-hour precip: 0.24 in.
6-hour snowfall: 2.5 ins.
24-hour precip: 0.24 in.
BHO SA 1155 –X E4 OVC 1/4SF 193/30/30/0107/010/ SF7
SNOINCR 1/3/3 TOTAL NEW SNW PST 24 HRS 2.5 INS/ 8/6//
58020 4/003 58020 MANUAL 6024/ ASOS 60023 MANUAL 70024 
ASOS 70023 10033 20030
 
10 A.M.
Weather: Obscurement with heavy fog, snow ended unknown time
during past hour, light freezing rain and drizzle and thin glaze
Temperature: 31F; Dew Point: 31F; Wind: ENE at 4 kts,
Sea-level pressure: 30.01 ins. Hg, FALLING RAPIDLY
Visibility: 1/16 mile, light freezing rain, light freezing drizzle and
heavy fog
3-hour snowfall: 1.0 in.
3-hour precip: 0.11 in. 
BHO SA 1455 W3 X 1/16ZR-ZL-F 163/31/31/0604/001/ SEZRZLBUKN THN GLZ
PRESFR TOTAL NEW SNW PST 3 HRS 1.0 IN WND LGT/ 8//// 58030 ASOS 60013 
MANUAL 6011/
 
1 P.M.
Weather: Obscurement with heavy fog, light freezing rain
occurring, freezing drizzle ended past hour, thin glaze  
Temperature: 32F; Dew Point: 32F; Wind: N at 7 kts,
Wind: Gradually backing
Sea-level pressure: 29.91 ins. Hg, falling then more slowly
Visibility: 1/16 mile, heavy fog, light freezing rain
6-hour max temp: 32F 
6-hour min temp: 29F
6-hour snowfall: 1.0 in.
6-hour precip: 0.17 in. 
BHO SA 1755 W3 X 1/16ZR-F 128/32/32/3507/991/ ZLEUKN THN GLZ WND GRDLY
BACKING/ 8//// 56035 MANUAL 6017/ ASOS 60018 10032 20029
 
WEATHER SUMMARY FOR TUESDAY, JANUARY 15
 
TEMPERATURE (DEGREES F)
MAX.....40      NORMAL.....33
MIN.....33      NORMAL.....17
MEAN....37      NORMAL.....25
 
DEPARTURE FROM 30-YEAR NORMAL......................+12
TOTAL DEPARTURE FOR THE MONTH.....................+124 [+8.1 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............28    DEPARTURE.........-12
TOTAL HEATING UNITS FOR THE MONTH...........465    DEPARTURE........-123
TOTAL HEATING UNITS FOR THE SEASON.........2493    DEPARTURE........-399
TOTAL HEATING UNITS LAST SEASON TO DATE....2252    DIFFERENCE.......+241
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............17 N   AT  9:04 A.M.
                   AERO....................16 NNW AT  1:58 A.M.
                   ASOS....................17 N   AT  9:04 A.M.
                   DAVIS...................16 NW  AT  2:00 A.M. RMY 17
THE FASTEST MILE FOR YESTERDAY.............11 N   AT  9:06 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..............13 N   AT  9:05 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.............12 NNW AT  9:05 A.M.
AVERAGE WIND SPEED AND DIRECTION......... 6.3 NNW
                   ASOS.................. 6.0
                   DAVIS..................5.7 NNW [340 deg.]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.24   DEPARTURE..........+0.09
                         ASOS..............0.23
TOTAL PRECIPITATION FOR THE MONTH..........0.42   DEPARTURE..........-1.72
                         ASOS..............0.38
TOTAL PRECIPITATION FOR THE YEAR...........0.42   DEPARTURE..........-1.72
                         ASOS..............0.38
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........2.5   DEPARTURE............+1.9
TOTAL SNOWFALL FOR THE MONTH...............2.6   DEPARTURE............-5.9
TOTAL SNOWFALL FOR THE SEASON.............18.0   DEPARTURE............-6.5   
 
PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
1/1   35/18/27/0/0.00/0.0/313/57      44 WNW AERO 44 MPH WNW RMY 45
1/2   29/11/20/-7/0.00/0.0/457/83     35 WNW AERO 35 MPH WNW RMY 33
1/3   23/2/13/-13/0.00/0.0/529/96     24 WNW AERO 23 MPH WNW RMY 23
1/4   38/19/29/+3/0.00/0.0/320/58     35 W   AERO 36 MPH W   RMY 36
1/5   40/27/34/+8/0.00/0.0/536/97     36 WNW AERO 37 MPH WNW RMY 38
1/6   42/27/35/+9/T/0.1/471/85        29 SW  AERO 29 MPH SW  RMY 29
1/7   38/27/33/+7/0.00/0.0/538/97     29 NW  AERO 27 MPH NW  RMY N/A
1/8   45/27/36/+10/0.00/0.0/428/77    39 SW  AERO 42 MPH SW  RMY 41
1/9   42/31/37/+11/T/0.0/033/06       40 W   AERO 39 MPH W   RMY N/A
1/10  45/32/39/+14/0.00/0.0/.../..    47 WNW AERO 48 MPH WNW RMY 50
1/11  38/29/34/+9/0.15/0.0/.../..     23 SE  AERO 21 MPH SE  RMY 23 
1/12  43/35/40/+15/0.02/0.0/000/00    21 SE  AERO 18 MPH SE  RMY 15
1/13  50/41/46/+21/0.01/0.0/000/00    30 SW  AERO 30 MPH SW  N/A
1/14  59/40/50/+25/T/0.0/.../..       36 S   AERO 37 MPH S   RMY 39
1/15  40/33/37/+12/T/0.0/.../..       17 N   AERO 16 MPH NNW RMY 17
 
1/16  morning low temp: 29F; the normal low is now 17F
      low occurred at 8 A.M.      
 
DAILY RECORDS FOR JANUARY 2013
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 16
HIGH 63F IN 1995
LOW -12F IN 2004
PRECIP 1.32 INS. IN 1936
SNOWFALL 14.0 INS. IN 1965
PEAK GUST 79 MPH WNW IN 1960
 
RECORDS FOR JANUARY 17
HIGH 55F IN 1973,1995
LOW -8F IN 1907,1982
PRECIP 1.43 INS. IN 1956
SNOWFALL 13.4 INS. IN 1956
PEAK GUST 62 MPH S IN 1994
 
TODAY'S REPORT PREPARED BY: Robert Skilling