Monday, December 16, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, DECEMBER 16, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0707E
SUNSET: 1613E
OVERCAST SKIES WITH A TOUCH OF LIGHT RAIN; A BIT MILDER WITH A
SOUTHEASTERLY FLOW….
A weak system is pushing through the region associated with a warm
front. An area of light precipitation has been progressing over the
area this morning, mainly in the form of very light rain here at the
Hill, but some locales have reported a bit of snow early this morning.
The precipitation has only amounted to a trace through 1pm.
Temperatures are a bit milder today than they have been over the past
few days. The overnight low was only in the upper 20s as opposed to
the mid teens on prior days. Readings have warmed into the low 40s by
early this afternoon. The dew point has also been on the rise, which
is no surprise since the wind is from a maritime direction. Values
have risen from the upper 20s early this morning to the mid 30s by
early this afternoon.
Winds have been fairly steady, but not all that strong. The southeast
to south-southeast wind has been averaging at around 11mph. The peak
gust so far for the day is 22mph, which occurred just before 7:30am
this morning.
Visibility has been variable with the light precipitation moving
through, ranging between 10-30 miles, but has increased to as much
as 60 miles early this afternoon in sectors without virga.
The maximum temperature for today is 41F degrees, which is 1 degree
above the normal high of 40F. The minimum temperature since midnight
is 29F degrees, which is 4 degrees above the normal low of 25F.
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Today’s Observations:
7 A.M.
Weather: Broken altostratus, broken altocumulus, overcast cirrostratus,
few breaks in overcast distant E-SE
Temperature: 33F; Dew Point: 28F; Relative Humidity: 80%
Wind: SE @ 12 kts
Sea-level pressure: 1035.4 mb; 30.58 in. Hg: rising, then falling
Visibility: 30 miles
6-hr Max temp: 33F
6-hr Min temp: 29F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E45 BKN 65 BKN 180 OVC 30 354/33/28/1412/058/ FEW BINOVC DSNT
E-SE/ 8/077 58001 10033 20029
10 A.M.
Weather: Overcast nimbostratus, very light rain
Temperature: 36F; Dew Point: 32F; Relative Humidity: 84%
Wind: SSE @ 7 kts
Sea-level pressure: 1035.3 mb; 30.57 in. Hg: falling, then rising
Visibility: 20 miles, 10 miles NW-NNE, thin fog
3-hr Precip: Trace
3-hr Snowfall: 0.0 inches
BHO SA 1455 E35 OVC 20R- 353/36/32/1607/057/ THN F ALQDS PCPN VRY LGT
VSBY 10 NW-NNE/ 8/02/ 55001 6000/
1 P.M.
Weather: Broken stratocumulus, overcast altostratus, few breaks in
overcast distant NNE-ESE, few lower stratocumulus distant NNE-E,
higher clouds visible distant NNE-ENE, virga distant SW-NW
Temperature: 41F; Dew Point: 35F; Relative Humidity: 79%
Wind: SSE @ 7 kts
Sea-level pressure: 1032.1 mb; 30.48 in. Hg: falling steadily
Visibility: 60 miles, 15 miles SW-WSW, 30 miles W-NW
6-hr Max temp: 41F
6-hr Min temp: 33F
6-hr Precip: Trace
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E12 BKN 30 OVC 60 321/41/35/1607/048/ FEW BINOVC DSNT
NNE-ENE FEW LWR SC DSNT NNE-E HIER CLDS VSBL DSNT NNE-ENE VIRGA DSNT
SW-NW VSBY 15 SW-WSW 30 W-NW/ 8/52/ 57032 6000/ 10041 20033
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SUMMARY FOR SUNDAY, DECEMBER 15, 2024
TEMPERATURE (DEGREES F)
MAX…….34 NORMAL…..40
MIN…….17 NORMAL…..25
MEAN……26 NORMAL…..33
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-7
TOTAL DEPARTURE FOR THE MONTH……………………-32 [-2.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………39 DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE MONTH…………..485 DEPARTURE…….+31
TOTAL HEATING UNITS FOR THE SEASON…………1428 DEPARTURE……-230
TOTAL HEATING UNITS LAST SEASON TO DATE…….1484 DEPARTURE…….-56
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)………..17 N @ 12:11 A.M.
VECTOR #1 (1-Sec)……….17 N @ 12:13 A.M.
VECTOR #2 (1-Sec)……….17 N @ 12:09 A.M.
DAVIS #1……………….16 SE @ 10:50 P.M.
DAVIS #2 ………………15 N @ 12:01 A.M.
RMY #1 (Instantaneous)…..16 N @ 12:01 A.M.
RMY #2 (Instantaneous)…..16 N @ 12:22 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………11 N @ 12:25 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..13 @ 12:19 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13 @ 12:01 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………12 N @ 12:18 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………13 NNE @ 12:14 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..12 N @ 12:18 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..13 N @ 12:01 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………5.8 NNW [139 total miles]
VECTOR #1……………….6.9
VECTOR #2……………….7.1
DAVIS #1………………..6.5 N
DAVIS #2………………..6.4 NNE
RMY #1………………….6.7 NW
RMY #2………………….7.2 NW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..4.54 DEPARTURE…..+1.86
TOTAL PRECIPITATION FOR THE YEAR (2024)…….52.01 DEPARTURE…..+0.86
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……-1.9
TOTAL SNOWFALL FOR THE SEASON (2024-2025)…….3.0 DEPARTURE……-4.4
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PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/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/-2/0.40/3.0/072/13 43 WNW VEC1 43 WNW RMY 47
12/6 31/23/27/-8/0.00/0.0/514/93 39 NW VEC1 39 W RMY 42
12/7 37/22/30/-5/T/T/408/74 25 S VEC1 25 S RMY 26
12/8 47/28/38/+3/0.02/T/198/36 37 SSW VEC1 37 SSW RMY 40
12/9 47/34/41/+7/0.41/0.0/187/34 28 ENE VEC1 28 E RMY 29
12/10 42/31/37/+3/0.15/0.0/000/00 31 NE VEC1 32 NE RMY 34
12/11 62/36/49/+15/3.38/0.0/000/00 65 SSW VEC1 67 SSW RMY 70 TSTM
12/12 53/25/39/+5/0.05/0.0/…/.. 51 WNW VEC1 49 WNW RMY 51
12/13 31/19/25/-8/0.00/0.0/…/.. 30 WNW VEC1 30 W RMY 30
12/14 33/17/25/-8/0.00/0.0/…/.. 20 NW VEC1 19 NNW RMY 20
12/15 34/17/26/-7/0.00/0.0/…/.. 17 N VEC1 17 N RMY 16
12/16 The low since midnight is 29F, the daily normal low is 25F.
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DECEMBER DAILY RECORDS TO DATE
12/11 NEW PRECIPITATION RECORD OF 3.38″; OLD RECORD 2.36″ IN 1992
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 16
HIGH 61 IN 1971
LOW -2 IN 1930
PRECIP 1.88 INS. IN 2022
SNOW 8.5 INS. IN 2007
WIND 73 MPH SSE IN 1982
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
TODAY’S REPORT PREPARED BY: Matt Douglas
