BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JANUARY 10, 2015   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
ANOTHER COLD DAY TODAY AFTER LIGHT SNOW YESTERDAY
 
Another shot of cold air moved into New England yesterday, though this air
mass is not nearly as cold as the one we saw just a couple days ago.  The
colder air was preceded by some light to moderate snow yesterday morning,
which brought 0.9 inches of snow to the summit, taking our monthly total up
to 4.1 inches.  The melted precipitation for this snowfall was 0.08 inches. 
After a high of 27F yesterday, the temperature bottomed out at 11F this
morning, and had climbed only to 22F by the 1:00 P.M. observation.
 
A large area of high pressure has kept our skies mainly clear today, with
just a few distant clouds at times.  The air is quite dry, with the dew
point only a few degrees above zero this afternoon.  The wind today has been
steady at about 10-15 mph from the west, with a few gusts up to 25mph,
creating a little bit of a wind chill factor.
 
Today's Observations:
 
7 A.M.
Weather: Clear, few stratocumulus distant NE-S
Temperature: 12F; Dew Point: 6F; Wind: W at 13 kts
Sea-level pressure: 30.25 ins. Hg, rising then rising more rapidly                    
Visibility: 35 miles, distant haze
6-hr max temp: 19F
6-hr min temp: 12F
24-hr precip.: 0.08 ins
24-hr snowfall: 0.9 ins
BHO SA 1155 35 243/12/6/2713/025/ SC DSNT NE-S DSNT HZ NEW SNW PST 24 HRS
0.9 INS/ 8/500 4/001 53020 ASOS 70007 MANUAL 70008 10019 20012
 
10 A.M.
Weather: Clear, few cumulus distant offshore NE-E, few stratocumulus
distant W-NE
Temperature: 18F; Dew Point: 7F; Wind: W at 9 kts
Sea-level pressure: 30.35 ins. Hg, rising then steady
Visibility: 45 miles, distant haze
BHO SA 1455 45 276/18/7/2609/035/ FEW CU DSNT OFFSHR NE-E FEW SC
DSNT W-NE DSNT HZ/ 8/500 51033
 
1 P.M.
Weather: Clear, few stratocumulus distant W-ENE
Temperature: 21F; Dew Point: 2F; Wind: W at 16G23 kts,
Sea-level pressure: 30.34 ins. Hg, falling then rising
Visibility: 60 miles, light distant haze
6-hr max temp: 22F
6-hr min temp: 11F
BHO SA 1755 CLR 60 275/21/2/2616G23/034/ FEW SC DSNT W-ENE LGT DSNT HZ/
8/500 55001 10022 20011
 
SUMMARY FOR FRIDAY, JANUARY 9, 2015
 
TEMPERATURE (DEGREES F)
MAX.....27   NORMAL.....34
MIN.....16   NORMAL.....17
MEAN....22   NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL..........................-4
TOTAL DEPARTURE FOR THE MONTH.........................-26 [-3.1 DEGREES/DAY]
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............43  DEPARTURE...........+4
TOTAL HEATING UNITS FOR THE MONTH.............375  DEPARTURE..........+26    
TOTAL HEATING UNITS FOR THE SEASON...........2435  DEPARTURE.........-219
TOTAL HEATING UNITS LAST SEASON TO DATE......2696  DIFFERENCE........-261
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..................35  WSW  AT 1:57  P.M. * 
                   ASOS.......................38  SW   AT 10:58 A.M. 
                   DAVIS......................35  SW   AT 11:39 A.M. RMY 38
FASTEST MILE FOR YESTERDAY....................25  SSW  AT 11:38 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE.................26  SW   AT 10:58 A.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE................24  SSW  AT 12:01 A.M.  
AVERAGE WIND SPEED AND DIRECTION.............15.3 WNW
                   ASOS......................15.2   
                   DAVIS.....................13.6 W  [260 degrees]
* last of several occurrences....              
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.08  DEPARTURE.....-0.06
                         ASOS..............0.07
TOTAL PRECIPITATION FOR THE MONTH..........1.26  DEPARTURE.....-0.02
                         ASOS..............1.27 
TOTAL PRECIPITATION FOR THE YEAR...........1.18  DEPARTURE.....-0.02
                         ASOS..............1.20 
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.9  DEPARTURE......+0.3
TOTAL SNOWFALL FOR THE MONTH................4.1  DEPARTURE......-1.0
TOTAL SNOWFALL FOR THE SEASON..............15.1  DEPARTURE......-6.0 
 
PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
1/1  31/18/25/-2/0.00/0.0/.../..              29 SSW RMY 30
1/2  37/26/32/+5/0.00/0.0/.../..              35 WSW RMY 38
1/3  34/21/28/+2/0.67/2.5/.../..              25 SE  RMY 26  
1/4  51/33/42/+16/0.48/0.0/000/00             30 SSW RMY N/A
1/5  46/13/30/+4/0.00/0.0/.../..              48 W   RMY 54
1/6  15/10/13/-13/0.02/0.4/.../..             29 W   RMY N/A
1/7  22/01/12/-14/0.01/0.3/.../..             43 WNW RMY 47 
1/8  16/-5/6/-20/0.00/0.0/.../..              39 WNW RMY N/A
1/9  27/16/22/-4/0.08/0.9/.../..              35 WSW RMY 38 
 
1/10 morning low temp: 12F since midnight; normal low is now 17F
 
DAILY RECORDS FOR JANUARY 2015
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):    
 
RECORDS FOR JANUARY 10
HIGH 54F IN 2000
LOW -7F IN 2004
PRECIP 2.16 INS. IN 1935
SNOWFALL 6.3 INS. IN 1977
PEAK GUST 73e SE IN 1977
 
RECORDS FOR JANUARY 11
HIGH 59F IN 1975
LOW -7F IN 1968
PRECIP 1.58 INS. IN 2008
SNOW 10.2 INS. 1927
PEAK GUST 95e MPH S IN 1980
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien