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Sunday, October 4, 2026

October 4, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, OCTOBER 4, 2026 ALL TIMES ARE…

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

SUNDAY, OCTOBER 4, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0545E
SUNSET:  1720E

COOL AND CALM TODAY WITH SEASONABLE TEMPERATURES….

Thin fog that prevailed this morning was slow to lift, but once
it did, cloud cover prevented us from seeing too much sun
or blue sky today. Even so, we remained dry though the daytime
hours. Visibility has improved as the day progressed, but
we had increasing cloudiness despite that.

Temperatures dipped down to 49F during the early morning hours
which is our normal low for this time of year. Temperatures were
slow to rise, mostly since we were in the clouds for much of the
day, preventing us from hitting the normal high (so far) of 66F.
Still though, with dew points in the lower 50s it feels a little
less crisp and cool, but still overall very comfortable compared
to just a couple of days ago.

Winds have shifted quite a bit today. We started with a dominant
northeast flow during the overnight hours and have since shifted
to the east-southeast. With this shift, winds have been lighter.
The average speed for the day so far is around 9mph. The peak gust
for the day so far occurred just after 9am with a speed of 24mph.

Visibility started off at only around 30 miles due to lingering
fog, but slowly improved to around 50 miles by the early afternoon
hours.

The maximum temperature so far today is 63F, which is 3 degrees
above the normal high of 66F. The minimum temperature since
midnight is 49F, which is equal to the normal low.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 52F; Dew Point: 52F; Relative Humidity: 98%
Wind: NE @ 6 kts, wind light
Sea-level pressure: 1028.4 mb; 30.37 in. Hg: falling, then rising
Visibility: 30 miles, thin fog all quadrants
6-hr Max temp: 52F
6-hr Min temp: 49F
24-hr Precip: 0.00 inches
BHO SA 1155 E20 BKN 250 BKN 30 284/52/52/0406/037/ THN F ALQDS
WND LGT/ 8/501 53002 10052 20049

10 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 61F; Dew Point: 51F; Relative Humidity: 69%
Wind: ESE@ 11 kts
Sea-level pressure: 1027.1 mb; 30.33 in. Hg: falling, then more slowly
Visibility: 40 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E22 BKN 250 BKN 40 271/61/51/1211/033/ 8/501 56013

1 P.M.
Weather: Scattered stratocumulus, overcast cirrostratus/cirrus
Temperature: 62F; Dew Point: 50F; Relative Humidity: 64%
Wind: ESE @ 8 kts
Sea-level pressure: 1024.6 mb; 30.26 in. Hg: falling, then more rapidly
Visibility: 50 miles
6-hr Max temp: 63F
6-hr Min temp: 52F
6-hr Precip: 0.00 inches
BHO SA 1755 20 SCT E220 OVC 50 246/62/50/1108/026/ FEW BINOVC ALQDS
SUN DMLY VSBL/ 8/507 58025 10063 20052

————————————————————–

SUMMARY FOR SATURDAY, OCTOBER 3, 2026

TEMPERATURE (DEGREES F)
MAX…….68   NORMAL…..66
MIN…….51   NORMAL…..49
MEAN……60   NORMAL…..57

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+3
TOTAL DEPARTURE FOR THE MONTH (OCT)…………………+26 [+8.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY……………..5  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH (OCT)………..5  DEPARTURE…….-19
TOTAL HEATING UNITS FOR THE SEASON…………..126  DEPARTURE…….-15
TOTAL HEATING UNITS LAST SEASON TO DATE……….92  DEPARTURE…….+34

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH (OCT)………..9  DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE SEASON…………..814  DEPARTURE……+142
TOTAL COOLING UNITS LAST SEASON TO DATE………736  DEPARTURE…….+78

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)………..24 NNW  @   12:05 A.M.
VECTOR #1 (1-Sec)……….24 NNW  @   03:11 A.M.
VECTOR #2 (1-Sec)……….24 NNW  @   12:06 A.M.
DAVIS #1……………….21 NNW  @   03:11 A.M.
DAVIS #2 ………………21 N    @   12:06 A.M.
RMY #1 (Instantaneous)…..24 NNW  @   03:11 A.M.
RMY #2 (Instantaneous)…..24 NNW  @   12:05 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……24 NNW  @   03:11 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 NNW  @   12:07 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 NNW  @   12:07 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 NNW  @   12:07 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 NNW  @   12:07 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 N    @   12:07 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 NNW  @   12:07 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 NNW  @   12:07 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 NNW  @   12:07 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..7.7 ESE [185 total miles] VECTOR #1………………9.1
VECTOR #2………………9.0
DAVIS #1……………….9.3 ENE
DAVIS #2…………………M
RMY #1…………………9.0 ENE
RMY #2…………………8.7 ENE
RICHARDS (C5C)………….9.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH (OCT)……..0.05 DEPARTURE…..-0.45
TOTAL PRECIPITATION FOR THE YEAR (2026)…….37.57 DEPARTURE…..-1.60

————————————————————–

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  74/56/65/+7/0.00/…/..             28 SW  VEC1 28 SW  RMY 27
10/2  84/63/74/+16/0.05/…/..            33 SW  VEC1 33 SW  RMY 32
10/3  68/51/60/+3/0.00/…/..             24 NNW VEC1 24 NNE RMY 24

10/4 The low since midnight is 49F, the daily normal low is 49F.

————————————————————–

OCTOBER DAILY RECORDS TO DATE

NONE.

————————————————————–

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

RECORDS FOR OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990

RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979

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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