Saturday, July 26, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JULY 26, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0431E
SUNSET: 1910E
MOSTLY CLEAR SKIES TODAY WITH THE RETURN OF WILDFIRE SMOKE….
Yesterday’s afternoon storms only yielded a trace of rain
on the hill, but the passing of the cold front allowed smoke
from Canadian wildfires to come through. Because of that, we
have been under an air quality alert and a smoke layer has
been visible all day, though it was much worse this morning.
Besides the smoke layer, we have had mostly clear skies with
the exception of some scattered cirrus clouds.
Temperatures have been more seasonable today, thanks to
yesterday’s cold front. The dew points have also been much
lower since yesterday, making for a much tolerable day. Dew points
have been in the mid 50s today, so we have not had to deal with
heat index values or the oppressive heat.
The wind has remained steady, though a bit lighter today than
the previous couple of days. Flow has typically been out of the
east-northeast, though it was out of the north-northwest last
night, probably helping to funnel the wildfire smoke into the
area. The average speed for the day so far is around 9mph. The
peak gust of 25mph occurred around 7:45am.
The smoke layer has impacted visibility severely today, though
we have seen some marginal improvement as the day progressed.
Visibility has fluctuated between 8 miles in the morning
to about 30 miles by afternoon.
The maximum temperature so far today is 79F degrees, which is
3 degrees below the normal high of 82F. The minimum temperature
since midnight is 66F degrees, which is 2 degrees above the
normal low of 64F.
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Today’s Observations:
7 A.M.
Weather: Clear, few cirrus all quadrants, smoke layer all
quadrants
Temperature: 70F; Dew Point: 54F; Relative Humidity: 58%
Wind: NW @ 9 kts
Sea-level pressure: 1020.4 mb; 30.13 in. Hg: rising unsteadily
Visibility: 10 miles, hazy
6-hr Max temp: 71F
6-hr Min temp: 66F
24-hr Precip: Trace
BHO SA 1155 CLR 10 204/70/54/3009/013/ FEW CI ALQDS K LYR ALQDS
HAZY VSBY 8 NNW-N 12 NNE-SE-W/ 8/001 52025 70000 10071 20066
10 A.M.
Weather: Scattered cirrus, smoke layer all quadrants
Temperature: 75F; Dew Point: 53F; Relative Humidity: 45%
Wind: WSW @ 8 kts
Sea-level pressure: 1020.9 mb; 30.15 in. Hg: rising, then
steady
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 250 SCT 20 209/75/53/0708/015/ K LYR ALQDS HAZY/
8/001 51005
1 P.M.
Weather: Scattered cirrus, smoke layer all quadrants
Temperature: 78F Dew Point: 50F; Relative Humidity: 38%
Wind: E @ 8 kts
Sea-level pressure: 1020.3 mb; 30.13 in. Hg: steady, then
falling
Visibility: 35 miles, hazy
6-hr Max temp: 79F
6-hr Min temp: 70F
6-hr Precip: 0.00 inches
BHO SA 1755 250 SCT 35 203/78/50/0908/013/ K LYR ALQDS HAZY/
8/001 58006 10079 20070
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SUMMARY FOR FRIDAY, JULY 25, 2025
TEMPERATURE (DEGREES F)
MAX…….95 NORMAL…..82
MIN…….69 NORMAL…..64
MEAN……82 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+9
TOTAL DEPARTURE FOR THE MONTH………………………+56 [+2.0 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…………….17 DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE MONTH……………247 DEPARTURE…….+49
TOTAL COOLING UNITS FOR THE SEASON…………..447 DEPARTURE……+110
TOTAL COOLING UNITS LAST SEASON TO DATE………449 DEPARTURE……..-2
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)……….E24 WSW @ 01:14 P.M.
VECTOR #1 (1-Sec)……….24 WSW @ 01:14 P.M.
VECTOR #2 (1-Sec)……….26 WNW @ 02:02 P.M.
DAVIS #1……………….23 W @ 01:44 P.M.
DAVIS #2 ………………25 WNW @ 01:46 P.M.
RMY #1 (Instantaneous)…..25 W @ 12:47 P.M.
RMY #2 (Instantaneous)…..26 WNW @ 01:49 P.M.
MERLIN…………………23 W
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 SW @ 12:32 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 @ 12:32 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 @ 12:10 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 WNW @ 01:48 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 SW @ 12:10 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 SW @ 12:32 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 SW @ 12:10 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.7 WSW [257 total miles]
VECTOR #1………………10.9
VECTOR #2………………11.1
DAVIS #1……………….10.8 WSW
DAVIS #2……………….11.1 W
RMY #1…………………10.7 W
RMY #2…………………11.1 WSW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..5.61 DEPARTURE…..+2.84
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.84 DEPARTURE…..-1.16
————————————————————–
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 95/69/82/+9/T/…/.. 24 WSW VEC1 24 WSW RMY 25 TSTM
7/26 The low since midnight is 66F, 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 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940
RECORDS FOR JULY 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRECIP 4.01 INS IN 1979
WIND 61 MPH WNW IN 2023 [TSTM]
TODAY’S REPORT PREPARED BY: Amanda Joly
