Friday, October 17, 2025

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

FRIDAY, OCTOBER 17, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0600E
SUNSET:  1659E

BRISK AND COOL WITH PLENTY OF SUNSHINE TODAY….

Skies have been mainly clear for the most part today with some
high thin cirrus clouds streaming in from the west. Low clouds
have been mainly starting over the ocean today. Either way,
sunshine has reigned supreme making for a very nice day overall.

Temperatures are still slightly below normal, but a bit milder
than yesterday. Readings have reached near 60F degrees early
this afternoon. The dew point has been gradually rising from
the mid 30s early this morning to the low 40s by early this
afternoon.

The wind has been fairly steady, but not as strong as yesterday.
The average speed for the day so far is around 11mph. The peak
gust so far for the day is 26mph, which occurred just before
9am this morning.

Visibility has been excellent today with a view of around 80
miles!

The maximum temperature so far today is 60F degrees, which is
1 degree below the normal high of 61F. The minimum temperature
since midnight is 41F degrees, which is 3 degrees below the
normal low of 44F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant NE-S, few cirrus
distant WSW-W
Temperature: 43F; Dew Point: 36F; Relative Humidity: 75%
Wind: N @ 9 kts
Sea-level pressure: 1014.8 mb; 29.97 in. Hg: rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 45F
6-hr Min temp: 41F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 80 148/43/36/3509/997/ FEW SC DSNT NE-S
FEW CI DSNT WSW-W/ 8/501 51014 10045 20041

10 A.M.
Weather: Clear, few stratocumulus distant NE-S, few cirrus
distant SSW-NNW
Temperature: 53F; Dew Point: 40F; Relative Humidity: 59%
Wind: N @ 7G16 kts
Sea-level pressure: 1014.9 mb; 29.97 in. Hg: rising, then falling
Visibility: 80 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 80 149/53/40/0107G16/997/ FEW SC DSNT NE-S
FEW CI DSNT SSW-NNW/ 8/501 50001

1 P.M.
Weather: Broken cirrus, few stratocumulus all quadrants
Temperature: 59F Dew Point: 42F; Relative Humidity: 52%
Wind: NNW @ 8G17 kts
Sea-level pressure: 1013.7 mb; 29.93 in. Hg: falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 60F
6-hr Min temp: 43F
6-hr Precip: 0.00 inches
BHO SA 1755 E250 BKN 80 137/59/42/3408G17/993/ FEW SC ALQDS/
8/504 56012 10060 20043

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SUMMARY FOR THURSDAY, OCTOBER 16, 2025

TEMPERATURE (DEGREES F)
MAX…….53   NORMAL…..61
MIN…….39   NORMAL…..44
MEAN……46   NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-6
TOTAL DEPARTURE FOR THE MONTH………………………+34 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….19  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH……………142  DEPARTURE…….-20
TOTAL HEATING UNITS FOR THE SEASON…………..205  DEPARTURE…….-74
TOTAL HEATING UNITS LAST SEASON TO DATE………231  DEPARTURE…….-26

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…….+14
TOTAL COOLING UNITS FOR THE SEASON…………..756  DEPARTURE…….+80
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)………..35 NW   @   11:11 A.M.
VECTOR #1 (1-Sec)……….35 NW   @   11:11 A.M.
VECTOR #2 (1-Sec)……….36 NNW  @   05:31 P.M.
DAVIS #1……………….34 NW   @   11:11 A.M.
DAVIS #2 ………………31 N    @   05:31 P.M.
RMY #1 (Instantaneous)…..36 NW   @   11:11 A.M.
RMY #2 (Instantaneous)…..36 NNW  @   05:31 P.M.
MERLIN…………………34 NW
RICHARDS (C5C) (Inst)……33 NW   @   11:11 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 NW   @   11:11 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23 NW   @   11:39 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 NNW  @   05:32 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 NW   @   11:39 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 N    @   05:32 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 NW   @   11:39 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 NNW  @   05:32 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23 NW   @   11:39 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..13.5 NNW [330 total miles] VECTOR #1………………13.5
VECTOR #2………………13.7
DAVIS #1……………….13.7 NNW
DAVIS #2……………….11.7 N
RMY #1…………………13.0 NNW
RMY #2…………………13.4 NNW
RICHARDS (C5C)………….13.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..4.34 DEPARTURE…..+1.61
TOTAL PRECIPITATION FOR THE YEAR (2025)…….40.16 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 The low since midnight is 41F, the daily normal low is 44F.

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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 17
HIGH 86F IN 1947
LOW 25F IN 1886
PRECIP 1.87 INCHES IN 1989
SNOWFALL TRACE IN 1970
PEAK GUST 61 MPH E IN 2019

RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL 3.0 INCHES IN 2009
PEAK GUST 66 MPH S IN 1967

TODAY’S REPORT PREPARED BY: Matt Douglas