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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JANUARY 20, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0708E
SUNSET: 1642E
BITTER COLD WITH ARCTIC AIR MASS IN PLACE….
The cold temperatures are undoubtedly the main story today. Our minimum this
morning just missed single-digit territory, coming in at 10F just before the 7am
observation. Thereafter, the temperature slowly climbed through the morning
as we were under a cirrostratus overcast. Since around noon, the overcast has
broken, and the resultant sunshine has allowed us to reach the upper teens.
The wind was more active overnight and during the early morning, but has been
steady throughout the day, with an average speed of 13mph to this point. The
peak gust was observed just after midnight, at around 30mph. The winds have been
out of the northwest for much of the day.
Visibility has been improving as the day goes on, beginning at around 40 miles
and improving to 60 miles by late morning.
The maximum temperature so far today is 20F degrees, this is 14
degrees below the normal high of 34F. The minimum temperature
so far since midnight is 10F degrees, this is 8 degrees below
the normal low of 18F.
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Today’s Observations:
7 A.M.
Weather: Broken cirrostratus, thin broken cirrus,
few stratocumulus distant N-E-SE and distant SSE-SSW
Temperature: 10F; Dew Point: 3F; Relative Humidity: 70%
Wind: NW @ 11G16 kts
Sea-level pressure: 1009.2 mb; 29.80 in. Hg: rising, then more rapidly
Visibility: 40 miles
6-hr Max temp: 15F
6-hr Min temp: 10F
24-hr Precip: Trace
24-hr Snowfall: Trace
Snow Depth: 1 inch
BHO SA 1155 E200 BKN 250 -BKN 40 092/10/3/3111G16/980 FEW SC DSNT N-E-SE AND
DSNT SSE-SSW TOTAL NEW SNW PST 24 HRS TRACE/ 8/508 4/001 53015 70000 10015 20010
10 A.M.
Weather: Overcast cirrostratus, few breaks in overcast and higher clouds visible
all quadrants, few stratocumulus distant NE-SE-SSW,
few altocumulus distant W-N-ENE, sun dimly visible
Temperature: 13F; Dew Point: 4F; Relative Humidity: 66%
Wind: NW @ 13G19 kts, peak wind 30mph NW @ 9:18am
Sea-level pressure: 1009.8mb; 29.82 in. Hg: rising, then falling
Visibility: 60 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E180 OVC 60 098/13/4/3213G19/982 FEW BINOVC ALQDS HIER CLDS VSBL
ALQDS FEW SC DSNT NE-SE-SSW FEW AC DSNT W-N-ENE SUN DMLY VSBL PK WND 3126/18/
8/556 50006
1 P.M.
Weather: Broken cirrostratus, thin broken cirrus, few stratocumulus distant ENE-SE,
few altocumulus all quadrants
Temperature: 18F; Dew Point: 6F; Relative Humidity: 58%
Wind: WNW @ 9 kts
Sea-level pressure: 1008.6 mb; 29.78 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 20F
6-hr Min temp: 10F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1755 E180 BKN 250 -BKN 60 086/18/6/2909/978 FEW SC DSNT ENE-SE
FEW AC ALQDS/ 8/556 4/001 56012 10020 20010
————————————————————–
SUMMARY FOR FRIDAY, JANUARY 19, 2024
TEMPERATURE (DEGREES F)
MAX…….27 NORMAL…..34
MIN…….16 NORMAL…..18
MEAN……22 NORMAL…..26
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………-4
TOTAL DEPARTURE FOR THE MONTH…………………..+69 [+3.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………43 DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH…………..653 DEPARTURE…….-70
TOTAL HEATING UNITS FOR THE SEASON…………2548 DEPARTURE……-385
TOTAL HEATING UNITS LAST SEASON TO DATE…….2460 DEPARTURE…….+88
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated
F420C (Official)……….E31 NW @ 08:05 P.M.
VECTOR #1 (1-Sec)……….30 NW @ 08:05 P.M.
VECTOR #2 (1-Sec)……….29 NW @ 11:33 P.M.
DAVIS #1……………….28 NW @ 08:05 P.M.
DAVIS #2 ………………26 NNW @ 08:05 P.M.
RMY #1 (Instantaneous)…..34 NW @ 08:05 P.M.
RMY #2 (Instantaneous)…..29 NW @ 11:33 P.M.
MERLIN…………………27 NW
RICHARDS (C5C) (Inst)……31 @ 08:05 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 NW @ 11:35 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 @ 08:06 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 @ 11:35 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 NW @ 11:35 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 NW @ 11:35 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 NW @ 11:35 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 NW @ 11:35 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20 @ 11:35 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.8 NNW [212 total miles]
VECTOR #1……………..9.0
VECTOR #2……………..9.5
DAVIS #1………………9.1 NNW
DAVIS #2………………9.2 N
RMY #1………………..8.9 NNW
RMY #2………………..9.3 NNW
RICHARDS (C5C)…………9.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..6.90 DEPARTURE…..+4.06
TOTAL PRECIPITATION FOR THE YEAR (2024)……..6.90 DEPARTURE…..+4.06
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH……………….16.8 DEPARTURE……+5.9
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……17.1 DEPARTURE……-8.9
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PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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
1/1 37/25/31/+2/0.00/0.0/296/54 15 N VEC1 14 N RMY 15
1/2 39/19/29/+1/0.00/0.0/550/100 17 WNW VEC1 17 WNW RMY 17
1/3 42/25/34/+6/0.00/0.0/347/63 20 WNW VEC1 21 WNW RMY 21
1/4 42/21/32/+4/T/T/237/43 37 NNW VEC1 36 NNW RMY 39
1/5 32/17/25/-3/0.00/0.0/542/98 40 NW VEC1 39 NW RMY 39
1/6 34/24/29/+1/0.11/0.2/022/04 36 E VEC1 36 E RMY 36
1/7 33/21/27/0/0.84/13.0/000/00 38 ENE VEC1 37 ENE RMY 42
1/8 32/21/27/0/0.00/0.0/406/73 28 NW VEC1 28 NW RMY 31
1/9 40/23/32/+5/0.98/T/000/00 46 SE VEC1 49 SE RMY 46
1/10 53/41/47/+20/1.90/0.0/201/36 70 SSE VEC1 69 SSE RMY 75
1/11 43/35/39/+12/0.00/0.0/162/29 45 WNW VEC1 43 WNW RMY 47
1/12 47/33/40/+13/0.00/0.0/533/95 29 SE VEC1 28 ESE RMY 28
1/13 57/36/47/+21/1.72/0.0/146/26 47 ESE VEC1 51 ESE RMY 49
1/14 39/22/31/+5/0.02/0.4/328/58 53 WNW VEC1 52 WNW RMY 54
1/15 31/17/24/-2/T/T/475/84 30 WNW VEC1 29 WNW RMY 30
1/16 34/19/27/+1/0.61/3.2/000/00 36 NW VEC1 33 NW* RMY 31*
1/17 25/13/19/-7/0.00/0.0/529/93 29 NW VEC1 28 W* RMY 27*
1/18 26/13/20/-6/0.00/0.0/…/.. 30 WSW VEC1 30 WSW RMY 29
1/19 27/16/22/-4/T/T/…/.. 31 NW VEC1 30 NW RMY 34
1/20 The low since midnight is 10F, the daily normal low is 18F
* Reading impacted by icing
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JANUARY DAILY RECORDS TO DATE
1/13: RECORD PRECIPITATION OF 1.72 INS,
BEATS PREVIOUS RECORD OF 1.54 INS SET IN 1979
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978
PEAK GUST 76e MPH NE IN 1978
RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888
PRECIP 2.49 INS. IN 1979
SNOWFALL 9.0 INS. IN 2014
PEAK GUST 78e MPH SE IN 1979
TODAY’S REPORT PREPARED BY: Joshua Polen
