Wednesday, September 3, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, SEPTEMBER 3, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0512E
SUNSET: 1814E
ANOTHER PLEASANT DAY IN PROGRESS WITH SEASONABLE TEMPERATURES….
It has certainly been a very nice start to the month of September
with yet another mainly sunny day along with seasonable
temperatures and comfortably dry air. As was the case yesterday,
some diurnal cumulus clouds have popped up early this afternoon
indicating fair weather.
Temperatures are quite pleasant for this time of year with
readings 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
generally in the low to mid 50s.
The wind has been on the light side yet again today, only averaging
around 7mph for the day so far. What wind there is has been rather
variable through the morning, but trying to settle more out of an
easterly direction early this afternoon. The peak gust for the day
so far is only 16mph, which occurred just after noontime.
Visibility is still decent today, generally holding at around
60-70 miles for the day.
The maximum temperature so far today is 78F degrees, which is
1 degrees above the normal high of 77F. The minimum temperature
since midnight is 57 degrees, which is 3 degrees below the normal
low of 60F.
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Today’s Observations:
7 A.M.
Weather: Scattered altocumulus/castellanus, scattered cirrus
Temperature: 64F; Dew Point: 52F; Relative Humidity: 65%
Wind: W @ 2 kts, wind light
Sea-level pressure: 1017.0 mb; 30.03 in. Hg: rising, then falling
Visibility: 70 miles
6-hr Max temp: 64F
6-hr Min temp: 57F
24-hr Precip: 0.00 inches
BHO SA 1155 60 SCT 250 SCT 70 170/64/52/2602/003/ WND LGT/ 8/081
50002 10064 20057
10 A.M.
Weather: Clear, few cumulus distant ESE-SSW and distant W-N,
few cirrus NE-SE-WSW
Temperature: 72F; Dew Point: 55F; Relative Humidity: 54%
Wind: SSW @ 2 kts, wind light
Sea-level pressure: 1016.7 mb; 30.02 in. Hg: rising, then falling
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 60 167/72/55/2005/002/ FEW CU DSNT ESE-SSW AND
DSNT W-N FEW CI NE-SE-WSW WND LGT/ 8/201 58003
1 P.M.
Weather: Broken cumulus, broken cirrus
Temperature: 78F Dew Point: 55F; Relative Humidity: 45%
Wind: S @ 6 kts, wind light and variable
Sea-level pressure: 1014.6 mb; 29.96 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 78F
6-hr Min temp: 64F
6-hr Precip: 0.00 inches
BHO SA 1755 E45 BKN 250 BKN 60 146/78/55/1806/996/ WND L/V/ 8/201
58021 10078 20064
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SUMMARY FOR TUESDAY, SEPTEMBER 2, 2025
TEMPERATURE (DEGREES F)
MAX…….77 NORMAL…..77
MIN…….58 NORMAL…..60
MEAN……68 NORMAL…..69
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-1
TOTAL DEPARTURE FOR THE MONTH……………………….-6 [-3.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH……………..1 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE SEASON……………21 DEPARTURE……..+1
TOTAL HEATING UNITS LAST SEASON TO DATE……….11 DEPARTURE…….+10
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..3 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………..3 DEPARTURE……..-6
TOTAL COOLING UNITS FOR THE SEASON…………..675 DEPARTURE…….+70
TOTAL COOLING UNITS LAST SEASON TO DATE………707 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)………..18 ESE @ 04:28 P.M.
VECTOR #1 (1-Sec)……….19 ESE @ 04:28 P.M.
VECTOR #2 (1-Sec)……….18 ESE @ 04:23 P.M.
DAVIS #1……………….18 E @ 04:28 P.M.
DAVIS #2 ………………18 SE @ 04:23 P.M.
RMY #1 (Instantaneous)…..18 ESE @ 04:28 P.M.
RMY #2 (Instantaneous)…..19 ESE @ 04:23 P.M.
MERLIN…………………16 E
RICHARDS (C5C) (Inst)……18 ESE @ 04:28 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 ESE @ 04:28 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..12 ESE @ 04:20 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13 ESE @ 04:23 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 ESE @ 04:23 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 S @ 08:21 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..13 ESE @ 04:23 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..13 ESE @ 04:23 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………13 ESE @ 04:23 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.6 E [183 total miles]
VECTOR #1……………….7.8
VECTOR #2……………….8.4
DAVIS #1………………..7.9 ESE
DAVIS #2………………..8.1 ESE
RMY #1………………….7.8 E
RMY #2………………….8.4 E
RICHARDS (C5C)…………..8.3
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…..-0.22
TOTAL PRECIPITATION FOR THE YEAR (2025)…….31.33 DEPARTURE…..-3.50
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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 77/58/68/-1/0.00/…/.. 18 ESE VEC1 19 ESE RMY 18
9/3 The low since midnight is 57F, 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 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)
RECORDS FOR SEPTEMBER 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966
TODAY’S REPORT PREPARED BY: Matt Douglas
