Thursday, July 24, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, JULY 24, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0429E
SUNSET: 1912E
HEAT AND HUMIDITY BUILDS UNDER MAINLY SUNNY SKIES….
We’ve seen a good deal of sunshine today with mainly high thin
cirrus floating by all add, being accompanied by diurnal cumulus
by early this afternoon. Warmer and much more humid air is
advecting into the area on a gusty southwest breeze.
Temperatures have reached the mid 80s with the dew point rising
from the low to mid 60s early this morning to the upper 60s by
early this afternoon. As such it feels much more humid today than
it did the past couple of days. Heat index values did reach the
low 90s for a time today, but have been mainly in the upper 80s.
The wind has been steady today mainly out of the southwest. The
average speed for the day so far is around 14mph. Gusts have been
frequently in the 20-25mph range today, with a peak of 29mph
occurring just before 7:30am this morning.
Visibility has been decreasing as the day goes, due to the
increasing humidity levels. The view was around 50 miles early
this morning, but has lowered to a hazy 30 miles by early this
afternoon.
The maximum temperature so far today is 87F degrees, which is 5
degrees above the normal high of 82F. The minimum temperature since
midnight is 63F degrees, which is 1 degree below the normal low
of 64F.
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Today’s Observations:
7 A.M.
Weather: Thin broken cirrus
Temperature: 70F; Dew Point: 63F; Relative Humidity: 77%
Wind: SW @ 13G22 kts
Sea-level pressure: 1023.3 mb; 30.22 in. Hg: steady, then falling
Visibility: 50 miles
6-hr Max temp: 70F
6-hr Min temp: 63F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 -BKN 50 233/70/63/2313G22/022/ 8/001 58004 10070
20006
10 A.M.
Weather: Thin broken cirrus
Temperature: 80F; Dew Point: 65F; Relative Humidity: 61%
Wind: WSW @ 9G17 kts
Sea-level pressure: 1022.4 mb; 30.19 in. Hg: falling, then more slowly
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E250 -BKN 40 224/80/65/2409G17/019/ HAZY/ 8/001 56009
1 P.M.
Weather: Broken cumulus, thin broken cirrus
Temperature: 86F Dew Point: 68F; Relative Humidity: 55%
Wind: SW @ 13G24 kts
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 87F
6-hr Min temp: 70F
6-hr Precip: 0.00 inches
BHO SA 1755 E40 BKN 250 -BKN 30 200/86/68/2313G24/012/ HAZY/ 8/201
58024 10087 20070
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SUMMARY FOR WEDNESDAY, JULY 23, 2025
TEMPERATURE (DEGREES F)
MAX…….83 NORMAL…..82
MIN…….60 NORMAL…..64
MEAN……72 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-1
TOTAL DEPARTURE FOR THE MONTH………………………+45 [+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……………..7 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………220 DEPARTURE…….+39
TOTAL COOLING UNITS FOR THE SEASON…………..420 DEPARTURE……+100
TOTAL COOLING UNITS LAST SEASON TO DATE………440 DEPARTURE…….-20
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)……….E25 SSW @ 07:32 P.M.
VECTOR #1 (1-Sec)……….25 SSW @ 07:32 P.M.
VECTOR #2 (1-Sec)……….25 SSW @ 06:17 P.M.
DAVIS #1……………….28 S @ 07:03 P.M.
DAVIS #2 ………………30 S @ 07:37 P.M.
RMY #1 (Instantaneous)…..25 SSW @ 07:32 P.M.
RMY #2 (Instantaneous)…..27 SSW @ 06:17 P.M.
MERLIN…………………22 S
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 SSW @ 06:17 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 @ 06:18 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 @ 06:17 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 S @ 06:18 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 S @ 05:37 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 SSW @ 06:17 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 SSW @ 06:17 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.2 SSW [196 total miles]
VECTOR #1……………….8.7
VECTOR #2……………….9.1
DAVIS #1………………..8.3 SSW
DAVIS #2………………..8.5 SSW
RMY #1………………….8.4 SW
RMY #2………………….9.1 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…..+3.06
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.84 DEPARTURE…..-0.94
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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 The low since midnight is 63F, 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 24
HIGH 99F IN 2022
LOW 49F IN 1893,1912
PRECIP 2.27 INS IN 2008
PEAK GUST 46 MPH NE IN 2009
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
TODAY’S REPORT PREPARED BY: MFD/Amanda Joly
