Tuesday, December 20, 2022

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

TUESDAY, DECEMBER 20, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0710E
SUNSET:  1614E

STILL CHILLY, BUT DECREASING WIND UNDER PLENTY OF SUNSHINE….

A splendid day in terms of clear sky today. Only noted some
stratocumulus clouds off over the ocean and a few well to
the west-northwest across western MA and SW NH. Despite the
abundance of sunshine, the temperature remains on the chilly
side with the mercury only reaching the upper 30s once again.
However, unlike the last couple of days, the wind was less
of a factor, especially as we worked into the afternoon hours.

The average wind speed for the day so far is around 14mph.

Visibility has been good to excellent all day starting the
day at 60 miles, but increased rapidly to 80 miles by mid
morning.

The high so far today is 38F, which is 1 degree below the
normal maximum of 39F. The low since midnight is 25F, which
is 1 degree above the normal minimum of 24F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumlus offshore distant NNE-S and
distant WNW-NW
Temperature: 26F; Dew Point: 19F; Relative Humidity: 75%
Wind: NW @ 13G21 kts
Sea-level pressure: 1024.6 mb; 30.26 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 27F
6-hr Min temp: 25F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 60 246/26/19/3213G21/026/ FEW SC OFFSHR DSNT NNE-S
AND DSNT WNW-NW/ 8/500 51022 10027 20025

10 A.M.
Weather: Clear, few stratocumlus offshore distant NNE-S and
distant W-NW
Temperature: 31F; Dew Point: 21F; Relative Humidity: 66%
Wind: NNW @ 14G24 kts
Sea-level pressure: 1026.6 mb; 30.32 in. Hg: rising, then steady
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 80 266/31/21/3314G24/032/ FEW SC OFFSHR DSNT NNE-S
AND DSNT W-NW/ 8/500 51020

1 P.M.
Weather: Clear, few stratocumlus offshore distant NNE-S and
distant WNW-NW
Temperature: 37F, Dew point: 22F; Relative Humidity: 54%
Wind: NW @ 8 kts
Sea-level pressure: 1025.7 mb; 30.29 in Hg: falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 38F
6-hr Min temp: 26F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 80 257/37/22/3208/029/ FEW SC OFFSHR DSNT NNE-S
AND DSNT WNW-NW/ 8/500 56009 10038 20026

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SUMMARY FOR MONDAY, DECEMBER 19, 2022

TEMPERATURE (DEGREES F)
MAX…….39   NORMAL…..39
MIN…….25   NORMAL…..24
MEAN……32   NORMAL…..32

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….0
TOTAL DEPARTURE FOR THE MONTH………………..+35 [+1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………33  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………..550  DEPARTURE…….-36
TOTAL HEATING UNITS FOR THE SEASON…………1519  DEPARTURE……-271
TOTAL HEATING UNITS LAST SEASON TO DATE…….1496  DEPARTURE…….+23

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….41 WNW @  2:51 P.M.
VECTOR #2 (Instantaneous)..44     @  2:51 P.M.
DAVIS #2 ………………38 WNW @ 11:43 A.M.
RMY #2 (Instantaneous)…..41 NW  @ 11:43 A.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………………34 WNW @  2:26 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28     @ 11:45 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………29 WNW @  2:53 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..28 WNW @ 11:45 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…….15.9 WNW [382 total miles] VECTOR #2……………..16.5
DAVIS #2………………16.5 NW
RMY #2………………..16.3 WNW
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……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..3.86 DEPARTURE…..+0.47
TOTAL PRECIPITATION FOR THE YEAR…………..40.93 DEPARTURE….-10.93

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH………………..2.7 DEPARTURE……-3.9
TOTAL SNOWFALL FOR THE SEASON (2022-2023)…….2.7 DEPARTURE……-6.4

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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/+2/0.09/0.0/…/..         40 E    AERO N/A    RMY 41
12/16 42/39/41/+9/1.88/0.0/…/..         47 E    AERO N/A    RMY 48
12/17 42/31/37/+5/0.45/0.1/…/..         37 WNW  AERO N/A    RMY 38
12/18 39/27/33/+1/0.00/0.0/…/..         29 NW   AERO N/A    RMY 28
12/19 39/25/32/0/0.00/0.0/…/..          41 WNW  AERO N/A    RMY 41

12/20 The low since midnight is 25F, the daily normal low is 24F

DAILY RECORDS

12/16/2022: NEW PRECIPITATION RECORD OF 1.88 INS,
THIS BEATS THE OLD RECORD OF 1.67 INS SET IN 1960

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

RECORDS FOR DECEMBER 20
HIGH 61 IN 1957
LOW -16 IN 1942
PRECIP 1.69 INS. IN 1936
SNOWFALL 13.7 INS. IN 2009
PEAK GUST 75 MPH S IN 2002

RECORDS FOR DECEMBER 21
HIGH 62 IN 2018
LOW -10 IN 1942
PRECIP 2.37 INS. IN 1946
SNOWFALL 11.4 INS. IN 1954
PEAK GUST 77 MPH SSE IN 1957

TODAY’S REPORT PREPARED BY: Matt Douglas