Sunday, December 11, 2016

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, DECEMBER 11, 2016

COLDEST TEMPERATURE SO FAR THIS SEASON THIS MORNING AT 16F…

A very cold start with the ski area blowing snow, winds calmed
overnight for the most part and have remained very light today.
Temperatures have climbed above freezing but still remain
below normal for the afternoon up until the 1 o’clock observation.

Visibility was good all day with mostly clear skies, but the pressure
is beginning to drop as a storm moves in with the expectation of
precipitation overnight into Monday.

7 A.M.
Weather: Scattered Cirrostratus, Few stratocumulus ENE-SE
Temperature: 16F; Dew Point: 6F; Wind: WSW at 07 kts
Sea-level pressure: 30.49 ins. Hg, rising, then more quickly
Visibility: 65 miles
6-hr Max temp: 17F
6-hr Min temp: 16F
24-hr precip: 0.00 in.
BHO SA 1155 220 SCT 65 325/16/6/2507/049/ FEW SC DSNT ENE-SE/
8/508 53017 10017 20016

10 A.M.
Weather: Few cirrus all quadrants
Temperature: 26F; Dew Point: 15F; Wind: W at 4 kts
Wind: Light
Sea-level pressure: 30.53 ins. Hg, rising, then less quickly
Visibility: 70 miles
BHO SA 1455 CLR 70 340/26/15/2604/053/ FEW CI ALQDS WND LGT/ 8/002

1 P.M.
Weather: Few Cirrus all quadrants
Temperature: 33F; Dew Point: 12F; Wind: W at 4 kts
Wind: Light
Sea-level pressure: 30.46 ins. Hg, rising, then falling and lower
Visibility: 70 miles
6-hr Max temp: 33F
6-hr Min temp: 17F
BHO SA 1755 CLR 70 315/33/12/2603/046/ FEW CI ALQDS WND LGT/ 8/002
58025 10033 20017

SUMMARY FOR SATURDAY, DECEMBER 10, 2016

TEMPERATURE (DEGREES F)
MAX…..27   NORMAL…..41
MIN…..17   NORMAL…..26
MEAN….22   NORMAL…..33

DEPARTURE FROM 30-YEAR NORMAL……………………-11
TOTAL DEPARTURE FOR THE MONTH…………………..0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..43   DEPARTURE……..+11
TOTAL HEATING UNITS FOR THE MONTH………….301   DEPARTURE………0
TOTAL HEATING UNITS FOR THE SEASON………..1331   DEPARTURE……..-231
TOTAL HEATING UNITS LAST SEASON TO DATE……1225   DIFFERENCE…….+106

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….26 WNW AT  11:22 A.M.*
ASOS……………………25 NW  AT  11:12 A.M.
DAVIS…………………..27 WNW AT  11:12 A.M. RMY 29
FASTEST MILE FOR YESTERDAY…………………19 WNW AT  9:10  A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 WNW AT  10:27 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 WWN AT  9:10  A.M.
AVERAGE WIND SPEED AND DIRECTION………….11.6 WNW
ASOS………………….11.5
DAVIS…………………10.2 W [281 Deg.]

* LAST OF SEVERAL PEAK GUSTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.43  DEPARTURE……-1.22
ASOS…………..0.49
TOTAL PRECIPITATION FOR THE YEAR……….37.40  DEPARTURE…..-12.78
ASOS………….37.92

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.4
TOTAL SNOWFALL FOR THE MONTH…………….0.4  DEPARTURE…….-2.8
TOTAL SNOWFALL FOR THE SEASON……………0.4  DEPARTURE…….-5.4

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

12/1  55/39/47/+10/0.20/0.0/385/69          36 W   AERO 37 W   RMY 36
12/2  48/34/41/+5/0.00/0.0/535/96           32 W   AERO 32 W   RMY N/A
13/3  44/31/38/+2/0.00/0.0/…/..           37 WNW AERO 39 WNW RMY 40
12/4  39/27/33/-2/0.00/0.0/…/..           25 NW  AERO 25 NW  RMY N/A
12/5  36/27/32/-3/0.13/0.4/…/..           26 W   AERO 25 W   RMY 29
12/6  42/30/36/+1/0.00/0.0/…/..           22 W   AERO 21 W   RMY N/A
12/7  39/34/37/+3/0.10/0.0/…/..           21 E   AERO 21 E   RMY N/A
12/8  40/29/35/+1/0.00/0.0/…/..           30 W   AERO 31 W   RMY 33
12/9  35/21/28/-6/0.00/0.0/…/..           35 W   AERO 36 WNW RMY 34
12/10 27/17/22/-11/0.00/0.0/…/..          26 WNW AERO 27 WNW RMY 29

12/11 Low temp since midnight is 16F; normal low is now 26F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR DECEMBER 11
HIGH 63 IN 1911
LOW -1 IN 1988
PRECIP 2.36 INS. IN 1992
SNOWFALL 6.0 INS. IN 1894
PEAK GUST 78 S IN 1969

RECORDS FOR DECEMBER 12
HIGH 67 IN 1979
LOW -3 IN 1988
PRECIP 3.94 INS. IN 1992
SNOWFALL 20.3 INS. IN 1960
PEAK GUST 75 MPH SSE IN 2008

TODAY’S REPORT PREPARED BY: Robert Millette