Sunday, December 18, 2022

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

SUNDAY, DECEMBER 18, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0708E
SUNSET:  1613E

CHILLY AND BRISK UNDER A MIX OF SUN AND CLOUDS….

Not much going on today. The morning started off clear with
only a few distant clouds. However these clouds have
increased in coverage this afternoon giving us an interplay
of sun and clouds. Temperatures, which started the day in the
upper 20s, have risen about 10 degrees to the upper 30s early
this afternoon. With a brisk west to northwest wind, the wind
chill has been frequently in the upper 20s early this
afternoon. So it definitely feels chilly out there today.

Average wind speed for the day so far is around 12mph with
frequent gusts between 25-30mph.

Visibility started off a bit limited at only around 40 miles,
but it has increased markedly early this afternoon, reaching
80 miles by the 1pm observation.

The high so far today is 39F, which is 1 degree below the
normal maximum of 40F. The low since midnight is 28F, which
is 4 degrees above the normal minimum of 24F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumlus offshore distant NE-ESE, few
altocumulus all quadrants
Temperature: 29F; Dew Point: 25F; Relative Humidity: 85%
Wind: W @ 10G16 kts
Sea-level pressure: 1008.6 mb; 29.78 in. Hg: rising steadily
Visibility: 40 miles, thin fog
6-hr Max temp: 31F
6-hr Min temp: 28F
24-hr Precip:  0.01 ins.
24-hr Snowfall: Trace
Snow Depth: 0 ins.
BHO SA 1155 CLR 40 086/29/25/2810G16/978/ FEW SC OFFSHR DSNT
NE-ESE AND DSNT S-SSW FEW AC ALQDS THN F ALQDS/ 8/570 52006
70001 10031 20028

10 A.M.
Weather: Broken altocumulus, few stratocumulus offshore distant
NE-E and distant S-SW
Temperature: 34F; Dew Point: 26F; Relative Humidity: 72%
Wind: WNW @ 8 kts
Sea-level pressure: 1009.7 mb; 29.82 in. Hg: rising, then more slowly
Visibility: 60 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E65 BKN 60 097/34/26/2908/982/ FEW SC OFFSHR DSNT
NE-E AND DSNT S-SW/ 8/570 51011

1 P.M.
Weather: Scattered stratocumulus, broken altocumulus, thin broken
cirrus
Temperature: 36F, Dew point: 24F; Relative Humidity: 61%
Wind: NW @ 13G21 kts
Sea-level pressure: 1008.3 mb; 29.78 in Hg: falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 39F
6-hr Min temp: 29F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 40 SCT E120 BKN 250 -BKN 80 083/36/24/3113G21/978/
8/571 56014 10039 20029

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SUMMARY FOR SATURDAY, DECEMBER 17, 2022

TEMPERATURE (DEGREES F)
MAX…….42   NORMAL…..40
MIN…….31   NORMAL…..25
MEAN……37   NORMAL…..32

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+5
TOTAL DEPARTURE FOR THE MONTH………………..+34 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………28  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………..485  DEPARTURE…….-34
TOTAL HEATING UNITS FOR THE SEASON…………1454  DEPARTURE……-269
TOTAL HEATING UNITS LAST SEASON TO DATE…….1431  DEPARTURE…….+23

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….37 WNW @  2:13 P.M.
VECTOR #2 (Instantaneous)..42     @  2:13 P.M.
DAVIS #2 ………………35 W   @  2:13 P.M.
RMY #2 (Instantaneous)…..38 WNW @  2:13 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………………24 NW  @ 11:59 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24     @ 11:55 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 WNW @ 11:55 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 NW  @ 11:55 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…….15.1 NW [363 total miles] VECTOR #2……………..15.4
DAVIS #2………………15.0 NW
RMY #2………………..15.3 NW
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……..0.01 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..3.86 DEPARTURE…..+0.82
TOTAL PRECIPITATION FOR THE YEAR…………..40.93 DEPARTURE….-10.58

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH………………..2.7 DEPARTURE……-3.0
TOTAL SNOWFALL FOR THE SEASON (2022-2023)…….2.7 DEPARTURE……-5.5

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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 The low since midnight is 28F, 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 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

RECORDS FOR DECEMBER 19
HIGH 59 IN 1899
LOW -1 IN 1919
PRECIP 2.06 INS. IN 1986
SNOWFALL 14.1 INS. IN 1945
PEAK GUST 68 NE IN 1986

TODAY’S REPORT PREPARED BY: Matt Douglas