Thursday, September 11, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, SEPTEMBER 11, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0520E
SUNSET: 1800E
MAINLY SUNNY TODAY WITH SEASONAL TEMPERATURES….
Today has featured mainly sunny skies with only a few cumulus
popping up decorating the sky. A few cirrus have also been
streaking by at times as well.
Temperatures have warmed into the mid 70s early this afternoon,
which is finally about normal for this time of year. Dew point
values have been sitting in the low to mid 50s all day, so the
air is quite comfortable.
The wind has been on the light side today averaging at around
9mph. It’s been somewhat variable in direction, but has settled
out of an easterly direction early this afternoon. The peak
gust so far is 16mph, which occurred just after 11:10am this
morning.
Visibility has been pretty good all day with a view of 60 miles
throughout the day.
The maximum temperature so far today is 75F degrees, which is
equal to the normal high of 75F. The minimum temperature since
midnight is 51F degrees, which is 6 degrees below the normal
low of 57F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 56F; Dew Point: 51F; Relative Humidity: 83%
Wind: NNW @ 8 kts
Sea-level pressure: 1019.2 mb; 30.10 in. Hg: rising, then steady
Visibility: 60 miles
6-hr Max temp: 56F
6-hr Min temp: 51F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 60 192/56/51/3308/010/ FEW CI ALQDS/ 8/001 51004
10056 20051
10 A.M.
Weather: Clear, few cumulus distant WSW-NW, few cirrus distant
WSW-N-NE
Temperature: 70F; Dew Point: 54F; Relative Humidity: 56%
Wind: NNE @ 5 kts, wind light
Sea-level pressure: 1020.1 mb; 30.12 in. Hg: falling, then more slowly
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 60 201/70/54/0205/012/ FEW CU DSNT WSW-NW
FEW CI DSNT WSW-N-NE WND LGT/ 8/201 51009
1 P.M.
Weather: Scattered cumulus, thin scattered cirrus
Temperature: 74F Dew Point: 57F; Relative Humidity: 55%
Wind: ENE @ 4 kts, wind light and variable
Sea-level pressure: 1019.6 mb; 30.11 in. Hg: steady, then falling
Visibility: 60 miles
6-hr Max temp: 75F
6-hr Min temp: 56F
6-hr Precip: 0.00 inches
BHO SA 1755 45 SCT 250 -SCT 60 196/74/57/0604/011/ WND L/V/
8/201 58005 10076 20056
————————————————————–
SUMMARY FOR WEDNESDAY, SEPTEMBER 10, 2025
TEMPERATURE (DEGREES F)
MAX…….65 NORMAL…..75
MIN…….54 NORMAL…..58
MEAN……60 NORMAL…..66
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-6
TOTAL DEPARTURE FOR THE MONTH………………………-20 [-2.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..5 DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH…………….20 DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE SEASON……………40 DEPARTURE……..+9
TOTAL HEATING UNITS LAST SEASON TO DATE……….21 DEPARTURE…….+19
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH…………….27 DEPARTURE…….-13
TOTAL COOLING UNITS FOR THE SEASON…………..699 DEPARTURE…….+63
TOTAL COOLING UNITS LAST SEASON TO DATE………718 DEPARTURE…….-19
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)………..24 NE @ 02:24 P.M.
VECTOR #1 (1-Sec)……….25 NE @ 02:14 P.M.
VECTOR #2 (1-Sec)……….25 ENE @ 12:33 P.M.
DAVIS #1……………….24 ENE @ 02:24 P.M.
DAVIS #2 ………………23 ENE @ 11:39 A.M.
RMY #1 (Instantaneous)…..25 NE @ 10:03 A.M.
RMY #2 (Instantaneous)…..25 NE @ 02:26 P.M.
MERLIN…………………24 NE
RICHARDS (C5C) (Inst)……23 NE @ 02:26 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 ENE @ 02:29 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 NE @ 02:25 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 NE @ 02:25 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NE @ 01:55 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 ENE @ 02:25 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 NE @ 02:25 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 NE @ 02:25 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16 ENE @ 11:39 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.9 NE [238 total miles]
VECTOR #1……………….9.8
VECTOR #2………………10.6
DAVIS #1……………….10.4 ENE
DAVIS #2……………….10.0 ENE
RMY #1………………….9.7 NE
RMY #2…………………10.3 NE
RICHARDS (C5C)………….10.1
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..2.14 DEPARTURE…..+0.95
TOTAL PRECIPITATION FOR THE YEAR (2025)…….33.47 DEPARTURE…..-2.33
————————————————————–
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/-5/0.00/221/28 23 NE VEC1 23 ENE RMY 23
9/2 77/58/68/-1/0.00/714/91 18 ESE VEC1 19 ESE RMY 18
9/3 78/57/68/0/0.00/719/92 21 SSW VEC1 21 SSW RMY 21
9/4 81/56/69/+1/0.00/…/.. 26 SSW VEC1 27 SSW RMY 28
9/5 82/63/73/+5/0.12/…/.. 30 SSW VEC1 31 SSW RMY 33
9/6 84/64/74/+6/1.05/…/.. 55 W VEC1 55 W RMY 57 TSTM
9/7 64/56/60/-7/0.97/…/.. 16 WNW VEC1 16 NNE RMY 15
9/8 68/49/59/-8/0.00/…/.. 21 NW VEC1 21 NW RMY 24
9/9 70/53/62/-5/0.00/…/.. 22 ENE VEC1 23 E RMY 23
9/10 65/54/60/-6/0.00/…/.. 24 NE VEC1 25 NE RMY 25
9/11 The low since midnight is 51F, the daily normal low is 57F.
————————————————————–
SEPTEMBER DAILY RECORDS TO DATE
NONE.
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 11
HIGH 93F IN 1983, 2013
LOW 37F IN 1917
PRECIP 5.23 INCHES IN 1954 (HURRICANE EDNA)
PEAK GUST 101 MPH NW IN 1954 (HURRICANE EDNA)
RECORDS FOR SEPTEMBER 12
HIGH 92F IN 1961
LOW 42F IN 1958,1967,1985
PRECIP 2.79 INCHES IN 1960 (HURRICANE DONNA)
PEAK GUST 140 MPH SSE IN 1960 (HURRICANE DONNA)
TODAY’S REPORT PREPARED BY: Matt Douglas/Amanda Joly
