Tuesday, October 21, 2025

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

TUESDAY, OCTOBER 21, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0604E
SUNSET:  1652E

WALL TO WALL SUNSHINE WITH MILD TEMPERATURES TODAY….

Today has featured clear skies with plenty of bright sunshine
through the day. A brisk westerly wind does make it feel a
bit cool, otherwise it’s a very fine mid October day!

Temperatures are a touch above normal for the date with
readings reaching the low to mid 60s early this afternoon. With
the dew point in the low 40s and the brisk wind, there is a
bit of a chill in the air, but it overall feels quite nice
in the sun.

As mentioned, the wind has been a bit busy, generally out of
the west-southwest. The average speed for the day so far is
around 13mph. The peak gust for the day so far is 28mph, which
occurred around 7:45am this morning.

Visibility has been very good today, rising from around 60
miles early this morning to around 70 miles by early this
afternoon.

The maximum temperature so far today is 64F degrees, which is
5 degrees above the normal high of 59F. The minimum temperature
since midnight is 47F degrees, which is 5 degrees above the
normal low of 42F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant ESE-SW, few altocumulus
distant NW-NE, few cirrus distant NNW
Temperature: 48F; Dew Point: 42F; Relative Humidity: 78%
Wind: WSW @ 12G20 kts
Sea-level pressure: 1010.9 mb; 29.85 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 50F
6-hr Min temp: 47F
24-hr Precip: 0.75 inches
BHO SA 1155 CLR 60 109/48/42/2512G20/985/ FEW SC DSNT ESE-SW
FEW AC DSNT NW-NE FEW CI DSNT NNW/ 8/551 51017 70075 10050 20047

10 A.M.
Weather: Clear, few stratocumulus distant ESE-SSW and distant
W-NNE, few cirrus distant S-SW
Temperature: 56F; Dew Point: 42F; Relative Humidity: 59%
Wind: W @ 11G21 kts
Sea-level pressure: 1011.7 mb; 29.88 in. Hg: rising unsteadily
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 70 117/56/42/2611G21/988/ FEW SC DSNT ESE-SSW
AND DSNT W-NNE FEW CI DSNT S-SW/ 8/501 52008

1 P.M.
Weather: Clear, few stratocumulus distant NNW-N, few cirrus
distant ESE-SW
Temperature: 63F Dew Point: 42F; Relative Humidity: 46%
Wind: WSW @ 9G17 kts
Sea-level pressure: 1010.5 mb; 29.84 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 64F
6-hr Min temp: 48F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 70 105/63/42/2409G17/984/ FEW SC DSNT NNW-N
FEW CI DSNT ESE-SW/ 8/501 58012 10064 20048

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SUMMARY FOR MONDAY, OCTOBER 20, 2025

TEMPERATURE (DEGREES F)
MAX…….64   NORMAL…..60
MIN…….51   NORMAL…..42
MEAN……58   NORMAL…..51

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+7
TOTAL DEPARTURE FOR THE MONTH………………………+48 [+2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..7  DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH……………182  DEPARTURE…….-34
TOTAL HEATING UNITS FOR THE SEASON…………..245  DEPARTURE…….-89
TOTAL HEATING UNITS LAST SEASON TO DATE………275  DEPARTURE…….-30

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….20  DEPARTURE…….+13
TOTAL COOLING UNITS FOR THE SEASON…………..756  DEPARTURE…….+79
TOTAL COOLING UNITS LAST SEASON TO DATE………757  DEPARTURE……..-1

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)………..40 SSE  @   09:13 A.M.
VECTOR #1 (1-Sec)……….40 SSE  @   08:59 A.M.
VECTOR #2 (1-Sec)……….41 SSE  @   09:05 A.M.
DAVIS #1……………….37 SSE  @   09:05 A.M.
DAVIS #2 ………………50 S    @   09:11 A.M.
RMY #1 (Instantaneous)…..41 SSE  @   08:59 A.M.
RMY #2 (Instantaneous)…..42 SSE  @   09:05 A.M.
MERLIN…………………38 S
RICHARDS (C5C) (Inst)……40 SSE  @   08:59 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………27 SSE  @   08:52 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..28 SSE  @   09:09 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..29 SSE  @   09:09 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 SSE  @   09:09 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………27 SSE  @   07:25 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..27 SSE  @   09:09 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..29 SE   @   07:25 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………27 SSE  @   09:09 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..16.1 SSE [387 total miles] VECTOR #1…………………M
VECTOR #2…………………M
DAVIS #1……………….15.7 S
DAVIS #2………………….M
RMY #1……………………M
RMY #2……………………M
RICHARDS (C5C)…………….M

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.75 DEPARTURE…..+0.56
TOTAL PRECIPITATION FOR THE MONTH…………..5.09 DEPARTURE…..+1.61
TOTAL PRECIPITATION FOR THE YEAR (2025)…….40.91 DEPARTURE…..-1.24

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PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

10/1  61/49/55/-3/0.00/668/97            30 NE  VEC1 30 NE  RMY 30
10/2  60/43/52/-6/0.00/637/91            28 NE  VEC1 28 NE  RMY 28
10/3  72/46/59/+2/0.00/670/96            23 SW  VEC1 23 SW  RMY 23
10/4  81/53/67/+10/0.00/667/96           18 NNW VEC1 18 NW  RMY 19
10/5  84/62/73/+16/0.00/664/96           18 SSW VEC1 18 SSW RMY 18
10/6  83/59/71/+15/0.00/649/94           25 SSW VEC1 25 SSW RMY 26
10/7  79/59/69/+13/0.00/440/64           35 SSW VEC1 35 SSW RMY 36
10/8  68/49/59/+4/0.80/027/04            33 NW  VEC1 34 SSW RMY 35 TSTM
10/9  55/40/48/-7/0.00/667/98            33 NNW VEC1 35 NNW RMY 35
10/10 61/38/50/-5/0.00/664/98            25 SSW VEC1 26 S   RMY 26
10/11 66/49/58/+4/0.00/243/36            21 SW  VEC1 21 SW  RMY 20
10/12 56/52/54/0/0.91/000/00             50 ENE VEC1 50 ENE RMY 52
10/13 53/50/52/-2/2.14/000/00            51 ENE VEC1 51 ENE RMY 51
10/14 53/50/52/-1/0.49/000/00            36 NE  VEC1 36 NNE RMY 35
10/15 62/44/53/0/T/319/48                33 NNW VEC1 33 NNW RMY 35
10/16 53/39/46/-6/0.00/…/..            35 NW  VEC1 35 NW  RMY 36
10/17 61/41/51/-1/0.00/…/..            26 N   VEC1 26 N   RMY 27
10/18 63/40/52/0/0.00/…/..             17 SSE VEC1 16 NNW RMY 17
10/19 68/50/59/+8/0.00/…/..            28 SSE VEC1 29 SSE RMY 28
10/20 64/51/58/+7/0.75/…/..            40 SSE VEC1 40 SSE RMY 41

10/21 The low since midnight is 47F, the daily normal low is 42F.

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OCTOBER DAILY RECORDS TO DATE

10/5  HIGH MINIMUM TEMPERATURE OF 62F,
TIED THE RECORD FOR THE DATE WITH 1910

10/6  HIGH MAXIMUM TEMPERATURE OF 83F,
TIED THE RECORD FOR THE DATE WITH 1990 AND 2007

10/13 PEAK GUST OF 51 MPH ENE,
BEAT THE OLD RECORD OF 46e MPH W IN 1950

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

RECORDS FOR OCTOBER 21
HIGH 82F IN 2024
LOW 24F IN 1974
PRECIP 2.34 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1941
PEAK GUST 69e MPH S IN 1976

RECORDS FOR OCTOBER 22
HIGH 85F IN 1979
LOW 23F IN 1940
PRECIP 2.38 INCHES IN 2014
SNOWFALL TRACE IN 1969, 2010
PEAK GUST 67 MPH ESE IN 1988

TODAY’S REPORT PREPARED BY: Matt Douglas