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Friday, September 25, 2026

September 25, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, SEPTEMBER 25, 2026 ALL TIMES ARE…

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

FRIDAY, SEPTEMBER 25, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0535E
SUNSET:  1736E

OVERCAST CONDITIONS, GUSTY WINDS AS NOR’EASTER APPROACHES….

Another windy day, but unfortunately no real sunshine has been
seen from the summit today. The sun has tried to peak through the
upper cirrostratus layer, but has been unsuccessful so far. As a
strong nor-easter approaches the summit, today has been active with
wind and so far dry. With the barometer falling pretty steadily after
noontime though, it is obvious that the storm is fast approaching
the area.

Temperatures have struggled to increase today, mostly from the
overcast conditions. Temperatures mostly have hovered in the upper
50s to just hitting 60F by 1pm. Dew points remain in the upper 40s
to low 50s which has given a fresh feel to the air for now.

Winds continue to be productive, as the nor’easter churns its way
closer to us. The average speed for the day so far is an impressive
15mph. It’s been rather gusty, with frequent northeast gusts in the
25-30mph range. The peak gust for the day so far is 39mph, which
occurred just after 11am this morning.

Visibility has been decent today, with the dry air hanging on for
much of the day, and gifting us around 60 miles for much of the
day. However, as the afternoon began, visibility degraded slightly
to around 50 miles.

The maximum temperature so far today is 60F, which is 9 degrees
below the normal high of 69F. The minimum temperature since
midnight is 48F, which is 4 degrees below the normal low of 52F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, broken cirrus
Temperature: 52F; Dew Point: 47F; Relative Humidity: 83%
Wind: NNE @ 15G22 kts
Sea-level pressure: 1023.0 mb; 30.21 in. Hg: falling, then steady
Visibility: 60 miles
6-hr Max temp: 52F
6-hr Min temp: 48F
24-hr Precip: 0.00 inches
BHO SA 1155 E120 BKN 250 BKN 60 230/52/47/0315G22/021/ SUN DMLY VSBL/
8/051 56003 10052 20048

10 A.M.
Weather: Broken altocumulus, overcast cirrostratus, few breaks in
overcast all quadrants
Temperature: 57F; Dew Point: 51F; Relative Humidity: 83%
Wind: NE @ 16G27 kts, peak wind ENE 35mph at 9:32 A.M.
Sea-level pressure: 1022.8 mb; 30.20 in. Hg: rising, then falling
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E150 BKN 220 OVC 60 228/57/51/0416G27/020/ FEW BINOVC
ALQDS SUN DMLY VSBL PK WND 0330/32/ 8/056 58002

1 P.M.
Weather: Broken altocumulus, overcast cirrostratus
Temperature: 60F; Dew Point: 49F; Relative Humidity: 68%
Wind: NE @ 16G33 kts, peak wind NE 38mph at 12:55 P.M.
Sea-level pressure: 1021.0 mb; 30.15 in. Hg: falling, then more rapidly
Visibility: 50 miles
6-hr Max temp: 60F
6-hr Min temp: 52F
6-hr Precip: 0.00 inches
BHO SA 1755 E150 BKN 220 OVC 50 210/60/49/0416G33/015/ SUN DMLY VSBL
PK WND 0433/55 8/056 58018 10060 20052

————————————————————–

SUMMARY FOR THURSDAY, SEPTEMBER 24, 2026

TEMPERATURE (DEGREES F)
MAX…….61   NORMAL…..70
MIN…….46   NORMAL…..53
MEAN……54   NORMAL…..61

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-7
TOTAL DEPARTURE FOR THE MONTH (SEP)…………………-25 [-0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY…………….11  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH (SEP)……….68  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE SEASON……………71  DEPARTURE……..-9
TOTAL HEATING UNITS LAST SEASON TO DATE……….61  DEPARTURE…….+10

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH (SEP)……….51  DEPARTURE…….-18
TOTAL COOLING UNITS FOR THE SEASON…………..805  DEPARTURE……+140
TOTAL COOLING UNITS LAST SEASON TO DATE………713  DEPARTURE…….+92

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 NE   @   11:39 A.M.
VECTOR #1 (1-Sec)……….33 ENE  @   03:53 P.M.
VECTOR #2 (1-Sec)……….37 NE   @   11:03 A.M.
DAVIS #1……………….33 ENE  @   11:39 A.M.
DAVIS #2 ………………30 ENE  @   11:03 A.M.
RMY #1 (Instantaneous)…..35 NE   @   11:03 A.M.
RMY #2 (Instantaneous)…..38 NE   @   11:03 A.M.
MERLIN…………………31 NE
RICHARDS (C5C) (Inst)……31 NE   @   11:03 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 ENE  @   11:08 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 ENE  @   11:08 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 NE   @   11:08 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 ENE  @   11:08 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 ENE  @   11:20 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 ENE  @   11:08 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 NE   @   11:20 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21 ENE  @   11:08 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….12.0 NE [289 total miles] VECTOR #1……………..12.1
VECTOR #2……………..13.0
DAVIS #1………………12.8 ENE
DAVIS #2………………12.1 ENE
RMY #1………………..12.0 NE
RMY #2………………..12.6 NE
RICHARDS (C5C)…………12.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH (SEP)……..2.26 DEPARTURE…..-0.89
TOTAL PRECIPITATION FOR THE YEAR (2026)…….28.25 DEPARTURE…..-9.51

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1  69/57/63/-6/0.21/008/01             15 SSW VEC1 15 E   RMY 14
9/2  76/58/67/-2/0.00/393/50             21 ESE VEC1 21 ESE RMY 20
9/3  74/60/67/-1/0.45/196/25             24 SSE VEC1 24 SSE RMY 23
9/4  84/63/74/+6/0.00/624/80             24 NNW VEC1 25 NNW RMY 24
9/5  71/60/66/-2/T/412/53                24 ENE VEC1 24 ENE RMY 25
9/6  69/53/61/-7/0.35/364/47             24 NE  VEC1 24 NNE RMY 27
9/7  79/52/66/-1/0.00/732/95             30 NW  VEC1 30 NW  RMY 30
9/8  80/58/69/+2/0.00/546/71             23 WNW VEC1 22 NNW RMY 24
9/9  80/58/69/+2/0.02/130/17             36 SSW VEC1 36 SSW RMY 36
9/10 84/67/76/+10/T/641/84               44 W   VEC1 43 W   RMY 47
9/11 77/59/68/+2/0.00/654/86             23 NW  VEC1 23 NW  RMY 25
9/12 77/55/66/0/0.00/667/88              23 SSW VEC1 23 SSW RMY 22
9/13 67/60/64/-1/0.98/000/00             25 SE  VEC1 26 SE  RMY 24
9/14 72/53/63/-2/T/572/76                32 NNW VEC1 32 NNW RMY 34
9/15 68/48/58/-7/0.00/727/97             18 S   VEC1 18 SE  RMY 18
9/16 78/53/66/+2/0.00/522/70             21 SW  VEC1 21 WSW RMY 21
9/17 82/63/73/+9/0.03/394/53             25 SW  VEC1 25 SW  RMY 27
9/18 79/58/69/+6/T/636/86                26 N   VEC1 26 NNW RMY 27
9/19 63/50/57/-6/0.00/531/72             21 N   VEC1 20 N   RMY 20
9/20 61/51/56/-7/0.11/000/00             21 SSE VEC1 22 SSE RMY 21
9/21 64/51/58/-4/0.11/542/74             24 ENE VEC1 23 ENE RMY 23
9/22 60/52/56/-6/0.00/481/66             32 ENE VEC1 32 ENE RMY 33
9/23 63/50/57/-5/0.00/566/78             39 ENE VEC1 38 ENE RMY 39
9/24 61/46/54/-7/0.00/…/..             35 NE  VEC1 33 ENE RMY 35

9/25 The low since midnight is 48F, the daily normal low is 52F.

————————————————————–

SEPTEMBER DAILY RECORDS TO DATE

NONE.

————————————————————–

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

RECORDS FOR SEPTEMBER 25
HIGH 87F IN 1970
LOW 31F IN 1950
PRECIP 2.68 INCHES IN 1961
PEAK GUST 63 MPH SSW IN 1991

RECORDS FOR SEPTEMBER 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977

TODAY’S REPORT PREPARED BY: Amanda Joly

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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