Friday, July 25, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, JULY 25, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0430E
SUNSET: 1911E
HUMID CONDITIONS PERSIST, HITTING 90s TODAY….
We have had plenty of sunshine today, and while the
temperatures started in the mid 70s, they quickly warmed
under the heat advisory we were under throughout the day.
By the final observation we had hit 93F which is only 3
degrees shy of our record, set in 2016.
As mentioned, temperatures have reached the 90s with the
dew point rising from the 69F to the mid 70s by early this
afternoon. With this combination of temperatures we had heat
indices from the mid 90s to hitting over 100F by 1pm.
The wind has remained steady again today, with a west-southwest
flow for much of the day. The average speed for the day so far
is around 12mph. The peak gust of 24mph occurred just after 1pm
with the arrival of a thunderstorm.
Due to the extreme heat and humid conditions, visibility has
been pretty abysmal. We have hovered between 30-25 miles for
much of the day.
The maximum temperature so far today is 93F degrees, which is
9 degrees above the normal high of 82F. The minimum temperature
since midnight is 69F degrees, which is 5 degrees above the normal
low of 64F.
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Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, thin broken cirrus
Temperature: 75F; Dew Point: 69F; Relative Humidity: 83%
Wind: WSW @ 9 kts
Sea-level pressure: 1014.1 mb; 29.95 in. Hg: falling, then
steady
Visibility: 35 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 69F
24-hr Precip: 0.00 inches
BHO SA 1155 120 SCT E250 -BKN 35 141/75/69/2509/995/ HAZY/
8/051 56002 10075 20069
10 A.M.
Weather: Thin broken cirrus, heat index 97
Temperature: 88F; Dew Point: 74F; Relative Humidity: 63%
Wind: WSW @ 8 kts
Sea-level pressure: 1022.4 mb; 30.19 in. Hg: steady, then
falling
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E250 -BKN 30 133/88/74/2408/992/ HAZY HX 97/
8/001 58008
1 P.M.
Weather: Scattered cumulus, broken altocumulus, broken dense
cirrus, towering cumulus W-WNW, heat index 105
Temperature: 93F Dew Point: 75F; Relative Humidity: 56%
Wind: WSW @ 9 kts
Sea-level pressure: 1011.3 mb; 29.86 in. Hg: falling unsteadily
Visibility: 35 miles, hazy
6-hr Max temp: 93F
6-hr Min temp: 75F
6-hr Precip: 0.00 inches
BHO SA 1755 50 SCT E180 BKN 220 BKN 35 113/93/75/2509/986/
TCU W-WNW HAZY HX 105/ 8/253 57020 10093 20075
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SUMMARY FOR THURSDAY, JULY 24, 2025
TEMPERATURE (DEGREES F)
MAX…….87 NORMAL…..82
MIN…….63 NORMAL…..64
MEAN……75 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+2
TOTAL DEPARTURE FOR THE MONTH………………………+47 [+1.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH……………..1 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON…………….1 DEPARTURE……..-5
TOTAL HEATING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY…………….10 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………230 DEPARTURE…….+40
TOTAL COOLING UNITS FOR THE SEASON…………..430 DEPARTURE……+101
TOTAL COOLING UNITS LAST SEASON TO DATE………442 DEPARTURE…….-12
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
F420C (Official)……….E29 SSW @ 06:37 P.M.
VECTOR #1 (1-Sec)……….29 SSW @ 06:37 P.M.
VECTOR #2 (1-Sec)……….31 SSW @ 07:12 A.M.
DAVIS #1……………….29 S @ 06:29 P.M.
DAVIS #2 ………………30 S @ 05:29 P.M.
RMY #1 (Instantaneous)…..30 SW @ 09:05 A.M.
RMY #2 (Instantaneous)…..32 S @ 05:04 P.M.
MERLIN…………………27 WSW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SW @ 06:38 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 @ 06:38 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 @ 06:38 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 SW @ 08:37 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 SSW @ 06:39 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 SSW @ 06:30 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 SSW @ 06:38 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.2 SW [340 total miles]
VECTOR #1………………14.2
VECTOR #2………………14.8
DAVIS #1……………….13.8 SW
DAVIS #2……………….14.7 SW
RMY #1…………………13.9 SW
RMY #2…………………14.8 SW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..5.61 DEPARTURE…..+2.95
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.84 DEPARTURE…..-1.05
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PRELIMINARY CLIMATE SUMMARY FOR JULY 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
7/1 90/68/79/+8/0.14/411/45 38 W VEC1 38 W RMY 41 TSTM
7/2 85/69/77/+6/0.02/247/27 23 WSW VEC1 24 WSW RMY 24
7/3 88/63/76/+4/0.03/748/82 39 SW VEC1 39 SW RMY 40 TSTM
7/4 80/60/70/-2/0.00/875/96 28 NNW VEC1 27 NNW RMY 29
7/5 83/61/72/0/0.00/664/73 23 W VEC1 23 W RMY 24
7/6 92/65/79/+7/0.00/818/90 29 SW VEC1 29 SW RMY 29
7/7 88/69/79/+7/0.01/490/54 28 SSW VEC1 28 SSW RMY 29 TSTM
7/8 94/67/81/+9/0.36/562/62 24 WSW VEC1 24 WSW RMY 27 TSTM
7/9 74/65/70/-3/0.73/172/19 26 SW VEC1 27 SW RMY 28 TSTM
7/10 66/61/64/-9/3.85/000/00 24 ENE VEC1 24 ENE RMY 24 TSTM
7/11 80/62/71/-2/0.00/190/21 18 SSW VEC1 18 SSW RMY 18
7/12 84/65/75/+2/0.00/505/56 20 S VEC1 20 S RMY 19
7/13 85/63/74/+1/0.00/505/56 21 SSW VEC1 21 SSW RMY 21
7/14 81/65/73/0/T/216/24 23 SW VEC1 23 SW RMY 25
7/15 90/71/81/+8/0.06/665/74 24 SSW VEC1 24 SSW RMY 24
7/16 93/71/82/+9/0.00/690/77 24 SSW VEC1 24 SSW RMY 23
7/17 89/73/81/+8/0.00/573/64 41 WNW VEC1 41 WNW RMY 42
7/18 81/67/74/+1/0.00/786/88 36 WNW VEC1 36 WNW RMY 37
7/19 84/62/73/0/0.00/882/99 23 SW VEC1 22 SW RMY 21
7/20 85/65/75/+2/0.41/338/38 31 NW VEC1 31 NW RMY 31 TSTM
7/21 78/61/70/-3/0.00/817/92 31 NNW VEC1 31 NNW RMY 33
7/22 77/55/66/-7/0.00/816/92 20 SSE VEC1 19 SSE RMY 20
7/23 83/60/72/-1/0.00/850/96 25 SSW VEC1 25 SSW RMY 25
7/24 87/63/75/+2/0.00/…/.. 29 SSW VEC1 29 SSW RMY 30
7/25 The low since midnight is 69F, the daily normal low is 64F.
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JULY DAILY RECORDS TO DATE
7/10 RECORD HIGHEST PRECIPITATION OF 3.85 INCHES;
BEATING OLD RECORD OF 1.95 INCHES SET IN 2015
7/16 TIED RECORD HIGH MINIMUM TEMPERATURE OF 71F;
ALSO SET IN 1901, 1958, 1968, 2013, AND 2023
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 25
HIGH 96F IN 2016
LOW 51F IN 1901,1953
PRECIP 2.25 INS IN 1990
PEAK GUST 88 MPH NW IN 1972
RECORDS FOR JULY 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940
TODAY’S REPORT PREPARED BY: Amanda Joly
