Tuesday, September 2, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, SEPTEMBER 2, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0511E
SUNSET: 1816E
CLOUDS AND FOG EARLY THIS MORNING MELT AWAY TO PLENTY OF SUNSHINE….
We started the day with some low clouds and fog, which quickly
moved out to reveal some mid level clouds which stuck around
through mid morning. By late this morning and early this afternoon
most of the clouds had dissipated leaving us with plenty of
sun. Some diurnal cumulus clouds have popped now thanks to the
surface heating.
Temperatures are still quite pleasant for this time of year with
reading reaching the mid to upper 70s by early this afternoon.
This is just about where we should be for early September. The
dew point continues to run in the comfortable range with values
slipping a bit from the upper 50s to mid 50s.
The wind has been on the light side again today, only averaging
around 7mph for the day so far. What wind there is has been
generally out of an easterly direction. The peak gust for the day
so far is only 17mph, which occurred just after 12pm.
Visibility is still decent today, generally holding at around
60 miles for the day.
The maximum temperature so far today is 77F degrees, which is
equal to the normal high of 77F. The minimum temperature since
midnight is 58 degrees, which is 2 degrees below the normal low
of 60F.
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PRELIMINARY STATS FOR AUGUST 2025
TEMPERATURE, Deg. F
Avg. Max. 79.5 [-0.7]
Avg. Min. 59.3 [-3.3]
Mean 69.4 [-2.0]
24-hour corrected mean: 68.5
Max. for month: 94F on the 11th
Min. for month: 51F on the 20th
HEATING DEGREE DAYS
Total heating units: 19 [+008]
Total for the season: 20 [+002]
Total for last season: 11
COOLING DEGREE DAYS
Total cooling units: 161 [-048]
Total for the season: 672 [+076]
Total for last season: 694
PRECIPITATION, Inches
Total: 1.88 [-2.03]
Greatest in 24 hrs: 0.68 on the 14th
SNOWFALL, Inches
Total: 0.0 [ 0.0]
Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 8.8 mph
Avg. corrected wind speed: 9.5 mph
Prevailing wind direction: South-southwest [15%]
Peak gust and direction: 41 NE on the 17th
SUNSHINE:
Campbell-Stokes card minutes: 18302 of a possible 22780, or 74%
Astronomical total minutes: 18979 of a possible 25724 or 74%
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Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, stratus layer ENE-SSW
Temperature: 62F; Dew Point: 58F; Relative Humidity: 85%
Wind: NNE @ 6 kts, wind light
Sea-level pressure: 1023.8 mb; 30.23 in. Hg: falling, then rising
Visibility: 60 miles
6-hr Max temp: 62F
6-hr Min temp: 58F
24-hr Precip: 0.00 inches
BHO SA 1155 150 SCT 60 238/62/58/0306/023/ ST LYR ENE-SSW
VSBY 8 ENE-SSE 15 S-SSW WND LGT/ 8/650 55000 10062 20058
10 A.M.
Weather: Clear, few cumulus distant W-NNE and distant ESE-SSW,
few altocumulus/castellanus distant N-SE and distant SSW-WSW
Temperature: 71F; Dew Point: 55F; Relative Humidity: 56%
Wind: E @ 5 kts, wind light
Sea-level pressure: 1023.2 mb; 30.22 in. Hg: falling unsteadily
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 60 232/71/55/0905/002/ FEW CU DSNT W-NNE AND
DSNT ESE-SSW FEW AC/ACC DSNT N-SE AND DSNT SSW-WSW WND LGT/
8/280 57006
1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 76F Dew Point: 56F; Relative Humidity: 50%
Wind: E @ 6 kts, wind light
Sea-level pressure: 1021.6 mb; 30.17 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 77F
6-hr Min temp: 62F
6-hr Precip: 0.00 inches
BHO SA 1755 40 SCT 250 SCT 60 216/76/56/0906/017/ WND LGT/
8/201 58016 10077 20062
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SUMMARY FOR MONDAY, SEPTEMBER 1, 2025
TEMPERATURE (DEGREES F)
MAX…….73 NORMAL…..78
MIN…….55 NORMAL…..60
MEAN……64 NORMAL…..69
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5
TOTAL DEPARTURE FOR THE MONTH……………………….-5 [-5.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..1 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH……………..1 DEPARTURE………0
TOTAL HEATING UNITS FOR THE SEASON……………21 DEPARTURE……..+2
TOTAL HEATING UNITS LAST SEASON TO DATE……….11 DEPARTURE…….+10
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE MONTH……………..0 DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE SEASON…………..672 DEPARTURE…….+71
TOTAL COOLING UNITS LAST SEASON TO DATE………704 DEPARTURE…….-32
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)………..23 NE @ 09:29 A.M.
VECTOR #1 (1-Sec)……….23 ENE @ 09:47 A.M.
VECTOR #2 (1-Sec)……….24 NE @ 09:22 A.M.
DAVIS #1……………….22 NE @ 09:29 A.M.
DAVIS #2 ………………21 E @ 09:44 A.M.
RMY #1 (Instantaneous)…..23 NE @ 09:29 A.M.
RMY #2 (Instantaneous)…..23 NE @ 09:29 A.M.
MERLIN…………………21 ENE
RICHARDS (C5C) (Inst)……21 NE @ 09:29 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 NNE @ 06:51 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 NE @ 09:31 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 NE @ 09:31 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 ENE @ 09:31 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 ENE @ 09:45 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 NE @ 09:31 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 ENE @ 09:44 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 NE @ 09:31 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.9 ENE [189 total miles]
VECTOR #1……………….8.1
VECTOR #2……………….8.6
DAVIS #1………………..8.4 NE
DAVIS #2………………..8.3 ENE
RMY #1………………….8.1 NE
RMY #2………………….8.5 NE
RICHARDS (C5C)…………..8.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE YEAR (2025)…….31.33 DEPARTURE…..-3.39
————————————————————–
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 71/57/64/-9/0.44/546/63 28 NE VEC1 28 NE RMY 27
8/2 75/54/65/-8/0.00/838/97 18 NNW VEC1 18 NNW RMY 18
8/3 83/59/71/-2/0.00/784/91 21 SSW VEC1 21 SSW RMY 21
8/4 84/61/73/0/0.00/757/88 17 W VEC1 17 W RMY 17
8/5 73/62/68/-5/0.00/480/56 28 NE VEC1 27 NE RMY 28
8/6 77/61/69/-4/0.00/248/29 17 ENE VEC1 17 ENE RMY 16
8/7 81/61/71/-2/0.00/665/78 18 ESE VEC1 18 ESE RMY 17
8/8 83/61/72/0/0.00/834/98 21 SSW VEC1 21 SSW RMY 21
8/9 83/60/72/0/0.00/814/96 22 S VEC1 22 SSW RMY 22
8/10 89/61/75/+3/0.00/761/90 22 S VEC1 22 S RMY 21
8/11 94/67/81/+9/0.00/792/94 20 W VEC1 19 W RMY 19
8/12 93/68/81/+9/0.00/806/96 21 SSW VEC1 21 SSW RMY 21
8/13 88/66/77/+5/0.00/344/41 25 SW VEC1 25 SW RMY 25
8/14 90/68/79/+7/0.68/426/51 35 NE VEC1 34 NE RMY 36 TSTM
8/15 75/63/69/-3/0.00/783/96 29 NE VEC1 29 ENE RMY 31
8/16 86/62/74/+2/0.00/730/88 23 S VEC1 24 S RMY 23
8/17 89/64/77/+5/0.19/414/50 41 NE VEC1 43 NE RMY 42 TSTM
8/18 68/55/62/-9/0.00/627/76 32 NE VEC1 34 NE RMY 34
8/19 73/54/64/-7/0.00/560/68 20 SE VEC1 19 SE RMY 18
8/20 63/51/57-14/0.51/008/01 22 ENE VEC1 22 ENE RMY 21
8/21 67/54/61/-10/T/303/37 36 ENE VEC1 35 NE RMY 36
8/22 79/53/66/-5/0.00/774/95 24 N VEC1 25 N RMY 25
8/23 85/60/73/+2/0.00/771/95 33 SSW VEC1 33 SSW RMY 35
8/24 80/60/70/-1/0.00/632/78 33 SSW VEC1 35 SSW RMY 34
8/25 83/63/73/+3/T/533/66 23 WSW VEC1 22 SW RMY 23
8/26 77/59/68/-2/0.00/765/95 28 WNW VEC1 27 WNW RMY 28
8/27 75/57/66/-4/T/634/79 26 WNW VEC1 26 NW RMY 27
8/28 77/52/65/-5/T/711/89 31 SSW VEC1 31 SSW RMY 31
8/29 73/59/66/-4/0.06/191/24 29 SSE VEC1 29 SSE RMY 29
8/30 75/52/64/-5/0.00/658/83 21 W VEC1 21 W RMY 22
8/31 75/53/64/-5/0.00/790/100 17 N VEC1 18 NNW RMY 17
————————————————————–
AUGUST DAILY RECORDS TO DATE
NONE.
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
9/1 73/55/64/-5/0.00/…/.. 23 NE VEC1 23 ENE RMY 23
9/2 The low since midnight is 58F, the daily normal low is 60F.
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SEPTEMBER DAILY RECORDS TO DATE
NONE.
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 2
HIGH 99F IN 1953 (SEPTEMBER MAXIMUM RECORD)
LOW 44F IN 1909
PRECIP 2.73 INCHES IN 1947
PEAK GUST 55e MPH WNW IN 1944
RECORDS FOR SEPTEMBER 3
HIGH 95F IN 1929
LOW 43F IN 1893
PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE)
PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE)
TODAY’S REPORT PREPARED BY: Matt Douglas
