Saturday, December 17, 2022

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

SATURDAY, DECEMBER 17, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0708E
SUNSET:  1613E

MOSTLY CLOUDY AND SEASONABLE AFTER SOME MUCH NEEDED RAIN….

Today we observed overcast conditions with increasing
visibility. We started off the day with a half mile
of visibility, and it increased to 70 miles by the
1 P.M. observation. Rainfall totaled a significant
2.11 inches by 7 A.M., with the event total being
2.41 inches. Some light snow was observed this morning,
leaving 0.1 inches on the snow boards at 7 A.M.

With all this rain, we have an inch of surplus rainfall
on the month with an annual deficit of -10.41 inches.

Wind is northwesterly with speeds around 15 mph and
frequent gusts of 25 mph.

The high so far today is 40F, which is the same as
the normal maximum. The low since midnight is 31F,
which is 6 degrees above the normal minimum of 25F.

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Today’s Observations:

7 A.M.
Weather: Light snow and fog
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: NW @ 14G21 kts
Sea-level pressure: 998.2 mb; 29.48 in. Hg: rising, then more
rapidly
Visibility: 1/2 mile, fog
6-hr Max temp: 39F
6-hr Min temp: 31F
24-hr Precip:  2.11 ins.
24-hr Snowfall: 0.1 ins.
Snow Depth: 0 ins.
BHO SA 1115 X W3 1/2S-F 982/32/32/3114G21/948/ NEW SNW PST 24
HRS 0.1 INS/ 8//// 4/000 53022 70211 10039 20031

10 A.M.
Weather: Overcast stratocumulus, light snow ending around
9:30 A.M.
Temperature: 35F; Dew Point: 34F; Relative Humidity: 95%
Wind: NW @ 13G23 kts
Sea-level pressure: 1001.5 mb; 29.58 in. Hg: rising, then
more rapidly
Visibility: 20 miles, thin fog
3-hr Precip:  0.01 ins.
3-hr Snowfall: Trace
BHO SA 1455 20 OVC 20S- 015/35/34/3313G23/958/ THN F ALQDS
S-E30 NEW SNW PST 3 HRS TRACE/ 8/7// 53033 6001/

1 P.M.
Weather: Overcast stratocumulus with breaks overhead
Temperature: 40F, Dew point: 36F; Relative Humidity: 85%
Wind: NW @ 15G24 kts, peak of 33 mph NW at 12:13 P.M.
Sea-level pressure: 1001.5 mb; 29.58 in Hg: falling then rising
Visibility: 70 miles, virga W-NW
6-hr Max temp: 40F
6-hr Min temp: 31F
6-hr Precip:  0.01 ins.
6-hr Snowfall: Trace
Snow Depth: 0 ins.
BHO SA 1755 30 OVC 70 015/40/36/3115G24/958/ FEW BINOVC OVHD
NEW SNW PST 6 HRS TRACE VIRGA W-NW PK WND 3129/13/ 8/500 50000
6001/ 10040 20031

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SUMMARY FOR FRIDAY, DECEMBER 16, 2022

TEMPERATURE (DEGREES F)
MAX…….42   NORMAL…..40
MIN…….39   NORMAL…..25
MEAN……41   NORMAL…..32

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+9
TOTAL DEPARTURE FOR THE MONTH………………..+29 [+1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………24  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..457  DEPARTURE…….-30
TOTAL HEATING UNITS FOR THE SEASON…………1426  DEPARTURE……-264
TOTAL HEATING UNITS LAST SEASON TO DATE…….1414  DEPARTURE…….+12

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….47 E   @  3:12 P.M.
VECTOR #2 (Instantaneous)..51     @  3:12 P.M.
DAVIS #2 ………………45 E   @  7:50 A.M.
RMY #2 (Instantaneous)…..51 E   @  3:12 P.M.
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………32 E   @  7:53 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..31     @ 12:21 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 E   @  7:52 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..31 E   @  7:52 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE……OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….20.0 E [481 total miles] VECTOR #2……………..19.3 ENE
DAVIS #2………………19.9 E
RMY #2………………..19.4 NE
RMY #1……….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1…….OUT OF SERVICE D/T RENOVATIONS
DAVIS #1……..OUT OF SERVICE D/T RENOVATIONS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..2.11 DEPARTURE…..+1.93
TOTAL PRECIPITATION FOR THE MONTH…………..3.85 DEPARTURE…..+0.99
TOTAL PRECIPITATION FOR THE YEAR…………..40.92 DEPARTURE….-10.41

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.1 DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH………………..2.7 DEPARTURE……-2.6
TOTAL SNOWFALL FOR THE SEASON (2022-2023)…….2.7 DEPARTURE……-5.1

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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  40/30/35/-2/0.00/0.0/520/93         54 NW   AERO N/A    RMY 60
12/2  44/27/36/-1/0.00/0.0/535/96         24 SSW  AERO N/A    RMY 25
12/3  57/36/47/+11/0.31/0.0/000/00        54 SSW  AERO N/A    RMY 57
12/4  41/30/36/0/0.00/0.0/355/64          39 WNW  AERO N/A    RMY 41
12/5  48/29/39/+3/0.00/0.0/454/82         32 SSW  AERO N/A    RMY 32
12/6  54/38/46/+11/0.09/0.0/000/00        30 SSE  AERO N/A    RMY 31
12/7  56/46/51/+16/0.85/0.0/000/00        39 SSE  AERO N/A    RMY 39
12/8  53/33/43/+8/0.00/0.0/534/97         36 NNW  AERO N/A    RMY 39
12/9  44/29/37/+3/0.00/0.0/549/100        29 N    AERO N/A    RMY 30
12/10 31/27/29/-5/0.04/0.4/000/00         27 NE   AERO N/A    RMY 26
12/11 30/23/27/-7/0.15/2.1/000/00         25 NNE  AERO N/A    RMY 26
12/12 29/21/25/-9/T/T/395/72              24 N    AERO N/A    RMY 24
12/13 38/19/29/-4/0.00/0.0/547/100        38 NNW  AERO N/A    RMY 38
12/14 35/18/27/-6/T/0.1/…/..            42 NNW  AERO N/A    RMY 44
12/15 40/30/35/+2/…./…/…/..         40 E    AERO N/A    RMY 41
12/16 42/39/41/+9/…./…/…/..         47 E    AERO N/A    RMY 48

12/17 The low since midnight is 31F, the daily normal low is 25F

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

RECORDS FOR DECEMBER 17
HIGH 63 IN 2000
LOW -9 IN 1942
PRECIP 3.03 INS. IN 1888
SNOWFALL 15.1 INS. IN 2020
PEAK GUST 78 MPH SSE IN 2000

RECORDS FOR DECEMBER 18
HIGH 59 IN 1928
LOW -11 IN 1919
PRECIP 1.44 INS. IN 1915
SNOWFALL 7.0 INS. IN 1904
PEAK GUST 76e W IN 1978

TODAY’S REPORT PREPARED BY: Benjamin Turner