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Wednesday, September 23, 2026

September 23, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, SEPTEMBER 23, 2026 ALL TIMES ARE…

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

WEDNESDAY, SEPTEMBER 23, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0533E
SUNSET:  1740E

ANOTHER COOL AND BRISK DAY WITH A MIX OF SUN AND CLOUDS….

Today has once again featured a mix of sun and clouds throughout
the day. A brisk onshore flow continues which is in turn helping
to keep temperatures on the cooler than normal side. All in all
it’s been a fairly decent stretch for outdoor walks/hikes, etc.

Temperatures reached the low 60s again today, but with the brisk
wind, it’s feels a bit cooler. The dew point started the day in
the low 50s, but slipped back to the mid to upper 40s during the
balance of the morning hours and early this afternoon.

Winds continue on the busy side today, out of the northeast
to east-northeast. The average speed for the day so far is around
14mph. It’s been rather gusty today as well with frequent gusts
over 30mph. The peak gust for the day so far is 38mph, which
occurred at least a couple of times between 8:30am and 8:45am
this morning.

Visibility has been decent again all day at around 70 miles.

The maximum temperature so far today is 63F, which is 7 degrees
below the normal high of 70F. The minimum temperature since
midnight is 50F, which is 3 degrees below the normal low of 53F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 53F; Dew Point: 51F; Relative Humidity: 92%
Wind: NE @ 12G21 kts
Sea-level pressure: 1033.6 mb; 30.52 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 53F
6-hr Min temp: 50F
24-hr Precip: 0.00 inches
BHO SA 1155 E20 BKN 250 BKN 70 336/53/51/0412G21/052/ 8/501
51012 10053 20050

10 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 63F; Dew Point: 49F; Relative Humidity: 61%
Wind: ENE @ 18G31 kts, peak wind ENE 38mph at 9:28 A.M.
Sea-level pressure: 1035.3 mb; 30.57 in. Hg: rising, then more rapidly
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E20 BKN 250 BKN 70 353/63/49/0718G31/057/
PK WND 0633/28/ 8/501 53017

1 P.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 60F; Dew Point: 47F; Relative Humidity: 61%
Wind: ENE @ 16G26 kts, peak wind ENE 37mph at 12:25 P.M.
Sea-level pressure: 1035.0 mb; 30.56 in. Hg: rising, then falling
Visibility: 70 miles
6-hr Max temp: 63F
6-hr Min temp: 53F
6-hr Precip: 0.00 inches
BHO SA 1755 E25 BKN 250 BKN 70 350/60/47/0616G26/056/
PK WND 0632/25/ 8/501 58003 10063 20053

————————————————————–

SUMMARY FOR TUESDAY, SEPTEMBER 22, 2026

TEMPERATURE (DEGREES F)
MAX…….60   NORMAL…..70
MIN…….52   NORMAL…..53
MEAN……56   NORMAL…..62

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-6
TOTAL DEPARTURE FOR THE MONTH (SEP)…………………-13 [-0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY……………..9  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH (SEP)……….49  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON……………52  DEPARTURE…….-18
TOTAL HEATING UNITS LAST SEASON TO DATE……….59  DEPARTURE……..-7

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH (SEP)……….51  DEPARTURE…….-15
TOTAL COOLING UNITS FOR THE SEASON…………..805  DEPARTURE……+143
TOTAL COOLING UNITS LAST SEASON TO DATE………710  DEPARTURE…….+95

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)………..32 ENE  @   06:07 A.M.*
VECTOR #1 (1-Sec)……….32 ENE  @   06:03 A.M.
VECTOR #2 (1-Sec)……….32 NE   @   06:03 A.M.
DAVIS #1……………….32 NE   @   06:03 A.M.
DAVIS #2 ………………29 ENE  @   10:40 A.M.
RMY #1 (Instantaneous)…..33 NE   @   10:38 A.M.
RMY #2 (Instantaneous)…..33 NE   @   10:40 A.M.
MERLIN…………………30 NE
RICHARDS (C5C) (Inst)……31 NE   @   10:38 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 ENE  @   11:15 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 ENE  @   11:11 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 NE   @   09:33 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 ENE  @   10:18 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 ENE  @   11:11 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 ENE  @   11:11 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 NE   @   11:11 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19 ENE  @   11:11 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….12.4 ENE [297 total miles] VECTOR #1……………..12.1
VECTOR #2……………..13.3
DAVIS #1………………13.0 ENE
DAVIS #2…………………M
RMY #1………………..12.2 NE
RMY #2………………..12.9 NE
RICHARDS (C5C)…………12.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH (SEP)……..2.26 DEPARTURE…..-0.60
TOTAL PRECIPITATION FOR THE YEAR (2026)…….28.25 DEPARTURE…..-9.22

————————————————————–

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/…/..             25 SW  VEC1 25 SW  RMY 27
9/18 79/58/69/+6/T/…/..                26 N   VEC1 26 NNW RMY 27
9/19 63/50/57/-6/0.00/…/..             21 N   VEC1 20 N   RMY 20
9/20 61/51/56/-7/0.11/…/..             21 SSE VEC1 22 SSE RMY 21
9/21 64/51/58/-4/0.11/…/..             24 ENE VEC1 23 ENE RMY 23
9/22 60/52/56/-6/0.00/…/..             32 ENE VEC1 32 ENE RMY 33

9/23 The low since midnight is 50F, the daily normal low is 53F.

————————————————————–

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 23
HIGH 93F IN 1895,1914
LOW 33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989

RECORDS FOR SEPTEMBER 24
HIGH 87F IN 1959
LOW 33F IN 1885,1950,1963
PRECIP 1.19 INCHES IN 1955
PEAK GUST 54e MPH SW IN 1940

TODAY’S REPORT PREPARED BY: Matt Douglas

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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
Part I — Data Use Policy
§ 01

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Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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