BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JANUARY 13, 2013   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
STAGNANT WIND YESTERDAY, FOG AND WARM TEMPS LINGER
 
The view from the observatory today has been the same as it was yesterday: white.
Unusually low winds yesterday (Average: 5.8 MPH) did little to move the dense fog
that has shrouded the summit of Great Blue Hill for the past ~30 hours, where
visibility has rarely exceeded 1/16 of a mile.
 
At 47 F and climbing, today beats Tuesday's and Thursday's high of 45 to claim the
title of warmest of the month so far. Today's average is also shaping up to be
considerably higher than yesterday's 40 F, as this morning's low only dropped
to 41 F.
 
Today's observations:
 
7 A.M.
Weather: Sky obscured by dense fog
Temperature: 42F; Dew Point: 42F; Wind: SE at 6 kts,
Sea-level pressure: 30.14 ins. Hg, falling then rising
Visibility: 1/16 mile, dense fog 
Snow depth: Trace
6-hr min. temp: 41F
24-hour precip: 0.02 in
BHO SA 1155 W2 X 1/16F 205/42/42/2006/014/ WND LGT/
8//// 53003 6001/ 70002 10042 20041
 
10 A.M.
Weather: Sky obscured by dense fog
Temperature: 43F; Dew Point: 43F; Wind: S at 8 kts,
Sea-level pressure: 30.16 ins. Hg, rising then falling  
Visibility: 1/16 mile, dense fog
BHO SA 1455 W2 X 1/16F 213/43/43/1908/016/ 8//// 50008
 
1 P.M.
Weather: Sky obscured by dense fog
Temperature: 47 F; Dew Point: 47 F; Wind: SSW at 9 kts,
Sea-level pressure: 30.10 ins. Hg, falling then falling more rapidly
Visibility: 1/16 mile, dense fog
6-hour max: 47F
6-hour min: 42F
BHO SA 1755 W2 X 1/16F 194/47/47/2009/010/ 8//// 58019 10047 20042
 
 
WEATHER SUMMARY FOR SATURDAY, JANUARY 12
 
TEMPERATURE (DEGREES F)
MAX.....43      NORMAL.....34
MIN.....35      NORMAL.....17
MEAN....40      NORMAL.....25
 
DEPARTURE FROM 30-YEAR NORMAL......................+15
TOTAL DEPARTURE FOR THE MONTH......................+65 [+5.5 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............25    DEPARTURE.........-15
TOTAL HEATING UNITS FOR THE MONTH...........403    DEPARTURE.........-65
TOTAL HEATING UNITS FOR THE SEASON.........2431    DEPARTURE........-342
TOTAL HEATING UNITS LAST SEASON TO DATE....2131    DIFFERENCE.......+300
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............21 SE  AT  1:03 A.M.
                   AERO....................18 SE  AT  1:08 A.M.
                   ASOS....................20 SE  AT  1:47 A.M.
                   DAVIS...................20 SE  AT  1:03 A.M. RMY 15
THE FASTEST MILE FOR YESTERDAY.............16 SE  AT  1:02 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..............15 SE  AT  1:02 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.............16 SE  AT  1:03 A.M.
AVERAGE WIND SPEED AND DIRECTION.........5.8  SE
                   ASOS..................6.0
                   DAVIS.................5.7 SSE [158 deg.]
 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02   DEPARTURE..........-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.18   DEPARTURE..........-1.52
                         ASOS..............0.14
TOTAL PRECIPITATION FOR THE YEAR...........0.18   DEPARTURE..........-1.52
                         ASOS..............0.14
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0   DEPARTURE............-0.6
TOTAL SNOWFALL FOR THE MONTH...............0.1   DEPARTURE............-6.7
TOTAL SNOWFALL FOR THE SEASON.............15.5   DEPARTURE............-7.3   
 
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/.../0.0/0/0         23 SE  AERO 21 MPH SE  RMY 23 
1/12  43/35/40/+15/.../0.0/.../..     21 SE  AERO 18 MPH SE  RMY 15
 
1/13  morning low temp: 41F; the normal low is now 17F
 
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 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
 
RECORDS FOR JANUARY 14
HIGH 65F IN 1995
LOW -12F IN 1914
PRECIP 1.45 INS. IN 2008
SNOWFALL 10.3 INS. IN 2008
PEAK GUST 68 MPH WNW IN 1976, S IN 2005
 
TODAY'S REPORT PREPARED BY: Forrest Iwanik