Monday, August 24, 2026

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

MONDAY, AUGUST 24, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0501E
SUNSET: 1831E

EARLY FOG BURNS OFF TO SUNNY SKIES THIS MORNING; CLOUDS REBUILD BY
EARLY AFTERNOON….

We started the day once again with a lot of low clouds and fog.
These very quickly burned off however with skies becoming mainly
clear even before the 7am observation. With plenty of sunshine
warming the surface and plenty of chilly air aloft associated with
a large upper level low centered over Ontario and Quebec, clouds
quickly re-built over the region by early this afternoon with a
mix of low, mid, and high level clouds. With the atmosphere being
unstable, some tower cumulus were observed well to the north-
northwest and north at the 1pm observation. Radar indicated some
showers that developed over southwest New Hampshire under those
billowing cloud formations.

Temperatures quickly warmed through the morning reaching the low
80s by early this afternoon. Now that we’re into late August, this
is actually above normal for the date! As of yesterday, the normal
high temperatures have slipped below 80F now! Fall is quickly
approaching! The dew point started the day in the mid 60s, so it
was rather humid this morning. However, as mixing from aloft take
place this afternoon, the air has dried out considerably with
readings dropping into the mid to upper 50s!

Winds were steady through the morning between 5-10mph, but pretty
suddenly picked up around 11am this morning and became quite gusty.
A southwesterly wind has averaged around 11mph for the day
so far. Gusts have been frequently exceeding 25mph during the
afternoon so far. The peak gust for the day so far is 31mph, which
occurred just after 11am this morning.

Once the fog burned off, the visibility improved to around 50 miles
early this morning. However it’s been decreasing since as haziness
increases. The view was down to around 30 miles by the 1pm obs.

The maximum temperature so far today is 82F, which is 3 degrees
above the normal high of 79F. The minimum temperature since
midnight is 62F, which is equal to the normal low.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few stratus fractus distant ESE-S-SW and distant
W-N-NE, few cirrus distant NE-SE-SSW
Temperature: 66F; Dew Point: 65F; Relative Humidity: 96%
Wind: SW @ 7 kts
Sea-level pressure: 1014.3 mb; 29.95 in. Hg: rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 66F
6-hr Min temp: 62F
24-hr Precip: 0.61 inches
BHO SA 1155 CLR 50 143/66/65/2207/995/ FEW STFRA DSNT ESE-S-SW
AND DSNT W-N-NE FEW CI DSNT NE-SE-SSW/ 8/601 51012 70061 10066 20062

10 A.M.
Weather: Clear, few towering cumulus distant NNW-NNE, few cirrus
distant NE-SE-SSW
Temperature: 77F; Dew Point: 60F; Relative Humidity: 55%
Wind: SW @ 9 kts
Sea-level pressure: 1014.9mb; 29.97 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 40 149/77/60/2209/997/ FEW TCU DSNT NNW-NNE
FEW CI DSNT NE-SE-SSW HAZY/ 8/201 51006

1 P.M.
Weather: Broken cumulus, broken altocumulus lenticularis,
broken cirrus
Temperature: 82F; Dew Point: 58F; Relative Humidity: 44%
Wind: WSW @ 15G27 kts, peak wind SW 31mph at 12:53 P.M.
Sea-level pressure: 1013.7 mb; 29.93 in. Hg: falling, and more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 82F
6-hr Min temp: 66F
6-hr Precip: 0.00 inches
BHO SA 1755 E40 BKN 70 BKN 250 BKN 30 137/82/58/2415G27/993/ HAZY
PK WND 2327/53/ 8/241 58012 10082 20066

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SUMMARY FOR SUNDAY, AUGUST 23, 2026

TEMPERATURE (DEGREES F)
MAX…….71 NORMAL…..79
MIN…….62 NORMAL…..62
MEAN……67 NORMAL…..71

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-4
TOTAL DEPARTURE FOR THE MONTH………………………+43 [+1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH (AUG)………..1 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON…………….3 DEPARTURE…….-10
TOTAL HEATING UNITS LAST SEASON TO DATE……….18 DEPARTURE…….-15

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..2 DEPARTURE……..-4
TOTAL COOLING UNITS FOR THE MONTH (AUG)………206 DEPARTURE…….+40
TOTAL COOLING UNITS FOR THE SEASON…………..703 DEPARTURE……+150
TOTAL COOLING UNITS LAST SEASON TO DATE………654 DEPARTURE…….+49

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)………..20 SSW @ 10:38 P.M.*
VECTOR #1 (1-Sec)……….20 S @ 09:11 P.M.
VECTOR #2 (1-Sec)……….21 S @ 09:13 P.M.
DAVIS #1……………….21 S @ 09:04 P.M.
DAVIS #2 ………………25 S @ 08:53 P.M.
RMY #1 (Instantaneous)…..20 SSW @ 10:38 P.M.
RMY #2 (Instantaneous)…..23 S @ 09:13 P.M.
MERLIN…………………18 S
RICHARDS (C5C) (Inst)……19 SSW @ 10:38 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 S @ 09:04 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 SSW @ 10:28 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 SSW @ 10:27 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 S @ 10:28 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 S @ 09:12 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SSW @ 10:28 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 SSW @ 10:27 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 SSW @ 10:28 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..6.2 ENE [149 total miles] VECTOR #1………………6.4
VECTOR #2………………6.9
DAVIS #1……………….6.3 ESE
DAVIS #2…………………M
RMY #1…………………6.5 ESE
RMY #2…………………6.9 E
RICHARDS (C5C)………….7.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.61 DEPARTURE…..+0.59
TOTAL PRECIPITATION FOR THE MONTH (AUG)……..1.73 DEPARTURE…..-1.23
TOTAL PRECIPITATION FOR THE YEAR (2026)…….25.83 DEPARTURE…..-7.83

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PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1 87/64/76/+3/0.00/719/83 23 SSW VEC1 24 S RMY 24
8/2 83/68/76/+3/0.01/406/47 29 S VEC1 28 S RMY 30
8/3 76/65/71/-2/0.70/121/14 44 SSW VEC1 44 SSW RMY 45 TSTM
8/4 85/61/73/0/0.00/860/100 18 W VEC1 18 W RMY 19
8/5 87/63/75/+2/0.00/694/81 21 W VEC1 21 WSW RMY 20
8/6 91/68/80/+7/0.00/539/63 21 SW VEC1 21 SW RMY 22
8/7 92/73/83/+10/T/793/93 20 SW VEC1 20 SW RMY 21
8/8 90/70/80/+8/T/723/85 29 W VEC1 29 WSW RMY 28
8/9 88/69/79/+7/0.00/814/96 28 W VEC1 27 W RMY 28
8/10 87/66/77/+5/0.00/609/72 24 W VEC1 24 W RMY 25
8/11 86/67/77/+5/0.00/792/94 26 WNW VEC1 26 WNW RMY 28
8/12 85/64/75/+3/T/781/93 18 W VEC1 18 W RMY 18
8/13 85/65/75/+3/0.01/679/81 26 WNW VEC1 25 WNW RMY 26
8/14 83/62/73/+1/0.00/710/85 21 NW VEC1 21 NNW RMY 22
8/15 81/59/70/-2/0.00/691/83 18 WNW VEC1 19 NNE RMY 19
8/16 82/57/70/-2/T/722/87 31 SW VEC1 31 SW RMY 31
8/17 75/63/69/-3/0.03/…/.. 29 S VEC1 28 S RMY 32
8/18 80/64/72/+1/0.00/…/.. 18 SSE VEC1 18 SSE RMY 18
8/19 87/67/77/+6/0.00/…/.. 28 W VEC1 27 W RMY 28
8/20 87/62/75/+4/0.14/…/.. 26 NNW VEC1 26 NNW RMY 27
8/21 67/61/64/-7/0.21/…/.. 22 ENE VEC1 22 ENE RMY 23
8/22 68/63/66/-5/0.01/…/.. 21 NE VEC1 20 NE RMY 22
8/23 71/62/67/-4/0.62/…/.. 20 SSW VEC1 20 S RMY 20