Friday, December 13, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, DECEMBER 13, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0705E
SUNSET: 1612E
PLENTY OF SUNSHINE, COLD, AND BLUSTERY THIS AFTERNOON….
Today started with some broken altocumulus clouds. As the high
pressure system to our west settled over the region, clouds
overhead moved out with the exception of some distant altocumulus
leaving us with a crisp blue sky for much of the day.
This has been another day where we have struggled to reach above
freezing. As of the 1pm observation we have still yet to make
it. The dew points have continued to drop into the single digits
making for some very dry (and cold) air.
The wind was light early this morning, but has picked up in the
past couple of hours. Our average wind speed so far is about 11mph
with predominantly WNW flow. Our current peak gust of 30mph
occurred just after 12pm this afternoon.
Thanks to the low dew points, visibility has been in the 50-60
mile range throughout the day today.
The maximum temperature for today is 31F degrees, which is 10
degrees below the normal high of 41F. The minimum temperature
since midnight is 24F degrees, which is 2 degrees below the
normal low of 26F.
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Today’s Observations:
7 A.M.
Weather: Broken altocumulus
Temperature: 24F; Dew Point: 13F; Relative Humidity: 62%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1032.7 mb; 30.50 in. Hg: rising, then more
rapidly
Visibility: 50 miles
6-hr Max temp: 25F
6-hr Min temp: 24F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E120 BKN 50 327/24/13/2805/050/ WND LGT/ 8/050 53021
10025 20024
10 A.M.
Weather: Clear, few altocumulus distant NE-E-S and WSW-W-NW
Temperature: 28F; Dew Point: 11F; Relative Humidity: 46%
Wind: NW @ 9 kts
Sea-level pressure: 1035.4 mb; 30.58 in. Hg: rising, then more
slowly
Visibility: 60 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 60 354/28/11/3009/058/ FEW AC DSNT NE-E-S AND
WSW-W-NW/ 8/050 51027
1 P.M.
Weather: Clear, few altocumulus distant all quadrants
Temperature: 31F; Dew Point: 10F; Relative Humidity: 41%
Wind: NW @ 16G22 kts
Sea-level pressure: 1035.4 mb; 30.58 in. Hg: falling, then rising
Visibility: 60 miles
6-hr Max temp: 31F
6-hr Min temp: 24F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 60 354/31/10/3116G22/058/ FEW AC DSNT ALQDS/ 8/050
50000 10031 20024
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SUMMARY FOR THURSDAY, DECEMBER 12, 2024
TEMPERATURE (DEGREES F)
MAX…….53 NORMAL…..41
MIN…….25 NORMAL…..26
MEAN……39 NORMAL…..34
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+5
TOTAL DEPARTURE FOR THE MONTH…………………….-9 [-0.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………26 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………..366 DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE SEASON…………1309 DEPARTURE……-253
TOTAL HEATING UNITS LAST SEASON TO DATE…….1395 DEPARTURE…….-86
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)………..51 WNW @ 01:24 A.M.
VECTOR #1 (1-Sec)……….49 WNW @ 01:24 A.M.
VECTOR #2 (1-Sec)……….54 WNW @ 01:24 A.M.
DAVIS #1……………….51 W @ 01:24 A.M.
DAVIS #2 ………………51 WNW @ 01:24 A.M.
RMY #1 (Instantaneous)…..51 WNW @ 01:24 A.M.
RMY #2 (Instantaneous)…..55 WNW @ 01:27 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………34 WNW @ 01:26 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..35 @ 01:26 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..40 @ 01:25 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………38 WNW @ 01:26 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………39 WNW @ 01:25 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..33 WNW @ 01:26 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..39 WNW @ 01:25 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..17.4 W [418 total miles]
VECTOR #1………………16.9
VECTOR #2………………17.6
DAVIS #1……………….17.9 W
DAVIS #2……………….17.8 W
RMY #1…………………16.1 W
RMY #2…………………17.2 W
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…………..4.54 DEPARTURE…..+2.39
TOTAL PRECIPITATION FOR THE YEAR (2024)…….52.01 DEPARTURE…..+1.39
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……-0.7
TOTAL SNOWFALL FOR THE SEASON (2024-2025)…….3.0 DEPARTURE……-3.2
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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 The low since midnight is 24F, the daily normal low is 26F.
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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 13
HIGH 60 IN 1984
LOW 0 IN 1893
PRECIP 1.45 INS. IN 1983
SNOWFALL 9.2 INS. IN 2007
PEAK GUST 81e WNW IN 1976
RECORDS FOR DECEMBER 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941
TODAY’S REPORT PREPARED BY: Amanda Joly
