Monday, January 5, 2026

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

MONDAY, JANUARY 5, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET:  1626E

ANOTHER ARCTIC AIR MASS IN PLACE, BUT A THAW IS ON THE WAY….

An arctic front passed through overnight bringing with it a few
light snow showers. This has lead to another very cold day today,
which seems to be the theme on Mondays for the past month.

Today featured sunshine early this morning, but clouds have been
increasing through the day as our next system approaches the
region.

Temperatures are once again well below normal with the low this
morning down in the low teens, and the high this afternoon has
only recovered to the mid 20s. Dew point values have been holding
in the single digits today.

As an act of mercy by Mother Nature, the wind has been very light
today. The average speed for the day so far is only around 8mph.
The peak gust for the day occurred just after midnight with a
value of 22mph.

Visibility has been limited all day, with a view of only 25-30
miles.

The maximum temperature so far today is 25F degrees, which is
11 degrees below the normal high of 36F. The minimum temperature
since midnight is 11F degrees, which is 9 degrees below the
normal low of 20F.

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Today’s Observations:

7 A.M.
Weather: Thin broken cirrus, few stratocumulus distant NE-ESE, few
altocumulus distant SSE-WSW
Temperature: 11F; Dew Point: 3F; Relative Humidity: 69%
Wind: NNW @ 9 kts
Sea-level pressure: 1024.1 mb; 30.24 in. Hg: rising unsteadily
Visibility: 30 miles, hazy
6-hr Max temp: 19F
6-hr Min temp: 11F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 2 inches
BHO SA 1155 E250 -BKN 30 241/11/3/3309/024/ FEW SC DSNT NE-ESE FEW AC
DSNT SSE-WSW HAZY TOTAL NEW SNW PST 24 HRS 0.2 INS/ 8/551 4/002 52019
70002 10019 20011

10 A.M.
Weather: Scattered altocumulus, overcast cirrus
Temperature: 18F; Dew Point: 4F; Relative Humidity: 54%
Wind: WNW @ 3 kts, wind light
Sea-level pressure: 1024.7 mb; 30.26 in. Hg: rising, then steady
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 100 SCT E250 OVC 25 247/18/4/3003/026/ HAZY WND LGT/ 8/051 51006

1 P.M.
Weather: Broken altocumulus, overcast cirrus
Temperature: 23F; Dew Point: 8F; Relative Humidity: 53%
Wind: SW @ 4 kts, wind light and variable
Sea-level pressure: 1022.8 mb; 30.20 in. Hg: falling, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 24F
6-hr Min temp: 11F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 2 inches
BHO SA 1755 E100 BKN 250 OVC 30 228/23/8/2304/020/ HAZY WND L/V/
8/051 4/002 56019 10024 20011

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SUMMARY FOR SUNDAY, JANUARY 4, 2026

TEMPERATURE (DEGREES F)
MAX…….30   NORMAL…..36
MIN…….21   NORMAL…..20
MEAN……26   NORMAL…..28

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-2
TOTAL DEPARTURE FOR THE MONTH………………………-26 [-6.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….43  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH……………134  DEPARTURE…….+24
TOTAL HEATING UNITS FOR THE SEASON………….2374  DEPARTURE…….+54
TOTAL HEATING UNITS LAST SEASON TO DATE……..2017  DEPARTURE……+357

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 *=Last of multiple occurrences

F420C (Official)………..26 NNW  @   10:51 P.M.
VECTOR #1 (1-Sec)……….27 NNW  @   10:51 P.M.
VECTOR #2 (1-Sec)……….28 NW   @   10:51 P.M.
DAVIS #1……………….25 WNW  @   11:17 P.M.
DAVIS #2 ………………26 NNW  @   10:51 P.M.
RMY #1 (Instantaneous)…..28 NNW  @   10:51 P.M.
RMY #2 (Instantaneous)…..29 NW   @   10:52 P.M.
MERLIN…………………25 NW
RICHARDS (C5C) (Inst)……26 NNW  @   10:51 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 NW   @   10:52 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 NW   @   10:53 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 NW   @   10:52 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NW   @   10:53 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 NNW  @   10:53 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 NW   @   10:53 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 NW   @   10:52 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17 NW   @   10:53 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.5 WNW [181 total miles] VECTOR #1……………….7.9
VECTOR #2……………….8.4
DAVIS #1………………..8.0 WNW
DAVIS #2………………..8.0 NW
RMY #1………………….7.6 WNW
RMY #2………………….8.2 WNW
RICHARDS (C5C)…………..8.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.02 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH (DEC)……..0.18 DEPARTURE…..-0.43
TOTAL PRECIPITATION FOR THE YEAR (2025)……..0.18 DEPARTURE…..-0.43

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.2 DEPARTURE…..-0.4
TOTAL SNOWFALL FOR THE MONTH (DEC)…………..3.1 DEPARTURE…..+0.9
TOTAL SNOWFALL FOR THE SEASON (2025-2026)……10.0 DEPARTURE…..-7.3

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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  29/11/20/-9/0.15/2.7/…/..         43 NW  VEC1 43 NW  RMY 42
1/2  25/12/19/-9/0.00/0.0/…/..         26 W   VEC1 26 W   RMY 27
1/3  30/14/22/-6/0.00/0.0/…/..         31 WNW VEC1 31 WNW RMY 31
1/4  30/21/26/-2/0.03/0.4/…/..         26 NNW VEC1 27 NNW RMY 28

1/5  The low since midnight is 11F, the daily normal low is 20F.

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JANUARY DAILY RECORDS TO DATE

NONE.

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

RECORDS FOR JANUARY 5
HIGH 61F IN 2007
LOW -9F IN 1981
PRECIP 1.15 INS. IN 2019
SNOW 4.5 INS. IN 1891
PEAK GUST 70 MPH WNW IN 1959

RECORDS FOR JANUARY 6
HIGH 66F IN 2007
LOW -14F IN 1896
PRECIP 3.10 INS. IN 1889 [RECORD FOR MONTH] SNOWFALL 5.2 INS. IN 2005
PEAK GUST 70 MPH WNW IN 1959

TODAY’S REPORT PREPARED BY: Matt Douglas