Wednesday, July 23, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, JULY 23, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0428E
SUNSET: 1913E
ONCE LAST IDEAL WEATHER DAY BEFORE THE HEAT AND HUMIDITY RETURNS….
Today is another wonderful day with plenty of sunshine mixed with
a few fair weather cumulus and occasional cirrus. The air mass
is still on the dry side as well, so that’s just adding to the
beauty of the day.
Temperatures have reached the low 80s, so it is warmer than the
past couple of days. However, the humidity has stayed on the low
side, at least so far. Dew point readings have been generally
in the mid to upper 50s for the day.
The wind has been quite light today, even going calm for a time
this morning, similar to yesterday. The average speed for the day
so far is around 7mph. The peak gust so far is 15mph, which
occurred just after midnight.
Visibility has been exceptional again today, albeit a touch
lower than yesterday. The view has been holding at around 70
miles all day, which is still pretty spectacular for this time
of year.
The maximum temperature so far today is 82F degrees, which is
equal to normal high of 82F. The minimum temperature since
midnight is 60F degrees, which is 4 degrees below the normal low
of 64F.
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Today’s Observations:
7 A.M.
Weather: Broken cirrus
Temperature: 66F; Dew Point: 59F; Relative Humidity: 78%
Wind: Calm
Sea-level pressure: 1025.3 mb; 30.28 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 66F
6-hr Min temp: 60F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 BKN 70 253/66/59/0000/028/ WND CALM/ 8/004 51013
10066 20060
10 A.M.
Weather: Thin scattered cirrus, few cumulus all quadrants
Temperature: 76F; Dew Point: 59F; Relative Humidity: 56%
Wind: W @ 2 kts, wind light and variable
Sea-level pressure: 1025.2 mb; 30.27 in. Hg: rising, then falling
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 250 -SCT 70 252/76/59/2602/027/ FEW CU ALQDS WND L/V/
8/201 58001
1 P.M.
Weather: Broken cumulus
Temperature: 81F Dew Point: 56F; Relative Humidity: 42%
Wind: S @ 5 kts, wind light and variable
Sea-level pressure: 1024.6 mb; 30.26 in. Hg: falling, then steady
Visibility: 70 miles
6-hr Max temp: 82F
6-hr Min temp: 66F
6-hr Precip: 0.00 inches
BHO SA 1755 E60 BKN 70 246/81/56/1805/026/ WND L/V/ 8/200 57006
10082 20066
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SUMMARY FOR TUESDAY, JULY 22, 2025
TEMPERATURE (DEGREES F)
MAX…….77 NORMAL…..82
MIN…….55 NORMAL…..64
MEAN……66 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-7
TOTAL DEPARTURE FOR THE MONTH………………………+46 [+1.9 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……..-4
TOTAL HEATING UNITS FOR THE SEASON…………….1 DEPARTURE……..-4
TOTAL HEATING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..1 DEPARTURE……..-8
TOTAL COOLING UNITS FOR THE MONTH……………213 DEPARTURE…….+40
TOTAL COOLING UNITS FOR THE SEASON…………..413 DEPARTURE……+101
TOTAL COOLING UNITS LAST SEASON TO DATE………435 DEPARTURE…….-22
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)……….E20 SSE @ 07:32 P.M.
VECTOR #1 (1-Sec)……….19 SSE @ 07:32 P.M.
VECTOR #2 (1-Sec)……….21 S @ 09:57 P.M.
DAVIS #1……………….22 S @ 10:55 P.M.
DAVIS #2 ………………26 S @ 10:10 P.M.
RMY #1 (Instantaneous)…..20 SSE @ 07:47 P.M.
RMY #2 (Instantaneous)…..21 S @ 09:57 P.M.
MERLIN…………………19 SSE
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 S @ 10:30 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 07:53 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 10:56 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 S @ 10:56 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 S @ 10:56 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SSE @ 07:53 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 S @ 10:56 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.5 NNW [180 total miles]
VECTOR #1……………….8.2
VECTOR #2……………….8.3
DAVIS #1………………..7.9 WNW
DAVIS #2………………….M
RMY #1………………….7.9 NW
RMY #2………………….8.4 WNW
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…..+3.17
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.84 DEPARTURE…..-0.83
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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/…/.. 41 WNW VEC1 41 WNW RMY 42
7/18 81/67/74/+1/0.00/…/.. 36 WNW VEC1 36 WNW RMY 37
7/19 84/62/73/0/0.00/…/.. 23 SW VEC1 22 SW RMY 21
7/20 85/65/75/+2/0.41/…/.. 31 NW VEC1 31 NW RMY 31 TSTM
7/21 78/61/70/-3/0.00/…/.. 31 NNW VEC1 31 NNW RMY 33
7/22 77/55/66/-7/0.00/…/.. 20 SSE VEC1 19 SSE RMY 20
7/23 The low since midnight is 60F, 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 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INS IN 1953
PEAK GUST 54e MPH S IN 1946
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
TODAY’S REPORT PREPARED BY: MFD
