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Monday, December 9, 2024

December 9, 2024

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY, DECEMBER 9, 2024 ALL TIMES ARE…

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

MONDAY, DECEMBER 9, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0702E
SUNSET:  1612E

CLOUDS RAPIDLY INCREASING TODAY, BUT STILL MILD WITH LIGHT WIND….

Clouds rapidly advanced into the area early this morning with
the balance of the day averaging mostly cloudy. Clouds have been thin
enough for several hours to allow for some filtered sunshine into
early this afternoon.

Temperatures have responded nicely to the limited sun today with
values rising from the mid 30s early this morning to the mid 40s by
late this morning and early this afternoon. With an overall lack of
wind, it feels quite nice out there, especially considering how cold
it was last week.

Winds were gusty in the wee hours of this morning, but then diminished
rapidly prior to sunrise, even going calm at times early this morning.
The average speed for the day so far is around 7mph, but it’s been
generally 5mph or less for the past several hours. The peak gust so
far for the day is 21mph occurring at 1:02am this morning.

Visibility has been somewhat limited today to around 50 miles due to
haziness from trapped low level pollution under an inversion.

The maximum temperature for today is 47F degrees, which is 5 degrees
above the normal high of 42F. The minimum temperature since midnight
is 34F degrees, which is 7 degrees above the normal low of 27F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus/altostratus, broken cirrus,
few stratocumulus distant NE-ESE
Temperature: 35F; Dew Point: 30F; Relative Humidity: 81%
Wind: WNW @ 7 kts
Sea-level pressure: 1020.1 mb; 30.12 in. Hg: falling, then rising
Visibility: 50 miles, hazy
6-hr Max temp: 39F
6-hr Min temp: 34F
24-hr Precip:  0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: Trace
BHO SA 1155 85 SCT E250 BKN 50 201/35/30/2907/012/ FEW SC DSNT NE-ESE
HAZY/ 8/571 4/000 53029 10039 20034

10 A.M.
Weather: Scattered altocumulus, thin overcast cirrus, few breaks in
overcast distant NE-SE, few stratocumulus distant NNE-ESE
Temperature: 43F; Dew Point: 33F; Relative Humidity: 67%
Wind: ESE @ 4 kts, wind light
Sea-level pressure: 1020.3 mb; 30.13 in. Hg: falling, then rising
Visibility: 50 miles, hazy
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 120 SCT E250 -OVC 50 203/43/33/1204/013/ FEW BINOVC DSNT
NE-SE FEW SC DSNT NNE-ESE HAZY WND LGT/ 8/551 53002

1 P.M.
Weather: Scattered altostratus, scattered altocumulus, thin overcast
cirrus, few stratocumulus distant N-ESE
Temperature: 46F; Dew Point: 32F; Relative Humidity: 58%
Wind: ESE @ 5 kts, wind light
Sea-level pressure: 1019.2 mb; 30.10 in. Hg: falling, then more slowly
Visibility: 50 miles, hazy
6-hr Max temp: 47F
6-hr Min temp: 36F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 120 SCT 150 SCT 250 -OVC 50 192/46/32/1205/010/
FEW SC DSNT N-ESE HAZY WND LGT/ 8/574 56011 10047 20035

————————————————————–

SUMMARY FOR SUNDAY, DECEMBER 8, 2024

TEMPERATURE (DEGREES F)
MAX…….47  NORMAL…..42
MIN…….28  NORMAL…..27
MEAN……38  NORMAL…..35

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+3
TOTAL DEPARTURE FOR THE MONTH…………………….-39 [-5.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………27  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH…………..272  DEPARTURE…….+38
TOTAL HEATING UNITS FOR THE SEASON…………1215  DEPARTURE……-223
TOTAL HEATING UNITS LAST SEASON TO DATE…….1313  DEPARTURE…….-98

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)………..37 SSW  @   03:54 A.M.
VECTOR #1 (1-Sec)……….37 SSW  @   03:54 A.M.
VECTOR #2 (1-Sec)……….36 SSW  @   03:54 A.M.
DAVIS #1……………….38 S    @   03:54 A.M.
DAVIS #2 ………………37 W    @   04:07 P.M.
RMY #1 (Instantaneous)…..40 SSW  @   04:17 A.M.
RMY #2 (Instantaneous)…..38 SSW  @   03:54 A.M.
MERLIN…………………36 WSW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………29 SSW  @   03:57 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25      @   03:55 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25      @   03:56 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………26 SSW  @   03:56 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 SSW  @   03:56 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..25 SSW  @   03:55 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 SSW  @   03:55 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..16.2 W  [389 total miles] VECTOR #1………………15.9
VECTOR #2………………16.2
DAVIS #1……………….16.1 WSW
DAVIS #2……………….16.4 WSW
RMY #1…………………15.4 WSW
RMY #2…………………16.0 WSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..0.55 DEPARTURE…..-0.88
TOTAL PRECIPITATION FOR THE YEAR (2024)…….48.02 DEPARTURE…..-1.88

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH………………..3.0 DEPARTURE……+0.8
TOTAL SNOWFALL FOR THE SEASON (2024-2025)…….3.0 DEPARTURE……-1.7

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

12/1   37/23/30/-7/0.00/0.0/452/81        21 WSW VEC1 21 WSW RMY 21
12/2   38/22/30/-7/0.00/0.0/551/99        18 W   VEC1 18 W   RMY 18
12/3   36/20/28/-8/0.00/0.0/411/74        21 NW  VEC1 21 WNW RMY 21
12/4   39/22/31/-5/0.13/T/394/71          30 S   VEC1 31 S   RMY 33
12/5   37/31/34/-2/0.40/3.0/…/..        43 WNW VEC1 43 WNW RMY 47
12/6   31/23/27/-8/0.00/0.0/…/..        39 NW  VEC1 39 W   RMY 42
12/7   37/22/30/-5/T/T/…/..             25 S   VEC1 25 S   RMY 26
12/8   47/28/38/+3/0.02/T/…/..          37 SSW VEC1 37 SSW RMY 40

12/9 The low since midnight is 34F, the daily normal low is 27F.

————————————————————–

DECEMBER DAILY RECORDS TO DATE

NONE.

————————————————————–

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

RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 3.23 INS. IN 2014
SNOWFALL 10.8 INS. IN 2005
PEAK GUST 66 SE IN 1973

RECORDS FOR DECEMBER 10
HIGH 62 IN 1946
LOW -6 IN 1902
PRECIP 1.67 INS. IN 1907
SNOWFALL 6.0 INS. IN 1905
PEAK GUST 66e SW IN 1940

TODAY’S REPORT PREPARED BY: Matt Douglas

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Please read the full Policy before accessing Observatory data · Effective January 1, 2025

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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