Monday, December 8, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, DECEMBER 8, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

MERCURY PLUMMETS OVERNIGHT, READING OF 16F COLDEST
OF THE SEASON THUS FAR

Temperatures struggled to reach above freezing yesterday,
with a midnight to midnight maximum of 36F recorded at
12:00 AM EST Sunday morning. Northerly winds kept a steady
flow of cold air through this morning with an overnight
low of 16F recorded before the 7:00 AM EST observation.
Very light and powdery snow, which began early this morning,
has continued through mid morning with decreasing visibility.

By the 1:00 PM EST observation very light snow was still falling
with a maximum of 22F reached. Visibility was poor in most
directions at just 9 miles. Only a trace of snow and liquid
equivalent was measured from 7:00 AM EST to 1:00 PM EST.

Today’s Observations:

7 A.M.
Weather: Light snow, overcast stratus, snow very light
Temperature: 18F; Dew Point: 10F; Wind: N at 10G17 kts
Sea-level pressure: 30.72 ins. Hg, rising, then more quickly
Visibility: 30 miles, except 70 miles WNW-NNW, obscured by snow
6-hr max temp: 18F
6-hr min temp: 16F
24-hr precip:  Trace
24-hr snowfall: Trace
BHO SA 1155 E13 OVC 30S- 403/18/10/0110G17/072/ VSBY WNW-NNW 70 MI
PCPN VRY LGT NEW SNW PST 24 HRS TRACE/ 8/6// 53002 MANUAL 6000/
10018 20016

10 A.M.
Weather: Light snow, overcast stratus
Temperature: 20F; Dew Point: 17F; Wind: N at 12 kts
Sea-level pressure: 30.75 ins. Hg, rising, then more quickly
Visibility: 6 miles, obscured by light snow
3-hour precip: Trace
3-hour snowfall: Trace
BHO SA 1455 E18 OVC 6S- 413/20/17/3512/075/ NEW SNW PST 3 HRS TRACE/
8/6// 53010 MANUAL 6000/

1 P.M.
Weather: Light snow, overcast stratus, very light snow
Temperature: 22F; Dew Point: 18F; Wind: NNW at 10 kts
Sea-level pressure: 30.67 ins. Hg, falling steadily
Visibility: 9 miles, obscured by light snow
6-hr max temp: 22F
6-hr min temp: 17F
6-hour precip: Trace
6-hour snowfall: Trace
BHO SA 1755 E19 OVC 9S- 386/22/18/3410/067/ PCPN VRY LGT NEW SNW PST
6 HRS TRACE/ 8/6// 57027 MANUAL 6000/ 10022 20017

SUMMARY FOR SUNDAY, DECEMBER 7, 2014

TEMPERATURE (DEGREES F)
MAX…..36   NORMAL…..42
MIN…..18   NORMAL…..27
MEAN….27   NORMAL…..34

DEPARTURE FROM 30-YEAR NORMAL…………………….-7
TOTAL DEPARTURE FOR THE MONTH……………………+12 [+1.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..38  DEPARTURE………..+7
TOTAL HEATING UNITS FOR THE MONTH………….195  DEPARTURE……….-12
TOTAL HEATING UNITS FOR THE SEASON………..1354  DEPARTURE………-115
TOTAL HEATING UNITS LAST SEASON TO DATE……1407  DIFFERENCE………-53

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………31 N   AT  7:54 P.M.
ASOS…………………..37 N   AT  7:48 P.M.
DAVIS………………….33 N   AT  7:48 P.M. RMY 34
FASTEST MILE FOR YESTERDAY………………..27 N   AT  7:53 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..25 N   AT  7:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….23 N   AT  7:55 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.9 N
ASOS………………….14.7
DAVIS…………………12.6 N (351 degrees)
* Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE…..-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.68  DEPARTURE…..+0.53
ASOS…………..1.70
TOTAL PRECIPITATION FOR THE YEAR……….49.44  DEPARTURE…..-0.24
ASOS………….49.89

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..TRACE  DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH…………..TRACE  DEPARTURE……-2.1
TOTAL SNOWFALL FOR THE SEASON……………8.7  DEPARTURE……+4.0

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/1  63/37/50/+13/0.01/0.0/…/..             28 WNW RMY 31
12/2  37/30/34/-2/…./T/000/00                26 E   RMY 29
12/3  49/34/42/+6/…./0.0/000/00              40 W   RMY 43
12/4  41/27/34/-1/…./0.0/…/..              29 WNW RMY N/A
12/5  42/23/33/-2/…./0.0/…/..              21 E   RMY 22
12/6  43/36/40/+5/…./0.0/000/00              25 NNW RMY N/A
12/7  36/18/27/-7/…./0.0/…/..              31 N   RMY 34

12/8  morning low temp: 16F since midnight; the normal low is now 26F

DAILY RECORDS FOR DECEMBER 2014:
None so far.

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

RECORDS FOR DECEMBER 8
HIGH 62 IN 1966
LOW -4 IN 1906
PRECIP 1.54 INS. IN 1969
SNOWFALL 2.5 INS. IN 2001
PEAK GUST 78e W IN 1979

RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 1.52 INS. IN 1956
SNOWFALL 10.8 INS. IN 2005
PEAK GUST 66 SE IN 1973

TODAY’S REPORT PREPARED BY: Brian Fitzgerald