Monday, September 8, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

MONDAY, SEPTEMBER 8, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0517E
SUNSET:  1806E

CLOUDS LINDER TODAY, BUT MUCH DRIER WITH COOL TEMPERATURES….

After yesterday’s just icky weather, which brought a storm
total of 2.02″ of rain (including 1.02″ just from the thunderstorm
on Saturday evening), today has been much improved despite high
clouds lingering over the area. They were thick enough through
the morning to block most of the sun, but they are finally
starting to thin out early this afternoon. All in all, it’s not
a bad day out there at all.

Temperatures are still below normal today as readings have not
been able to even reach 70F so far. Normal highs should be in
the mid 70s at this time of year. Dew point values were in the
upper 40s early this morning, very indicative of fall, but they
have recovered a bit to the low 50s by early this afternoon.

The wind was a bit gusty during the wee hours of this morning,
but really dropped off during the morning and has been generally
light, and at times variable for the last several hours. The
average speed for the day so far is around 9mph, but most of this
is owing to the gustier winds for the first 7 hours of the day.
The peak gust for the day is 21mph, which occurred around 3:30am
this morning.

Visibility has been excellent today, thanks to the nice and dry
air. The view started off at 80 miles, but slipped a bit to
around 70 thereafter. Either way, still a great view!

The maximum temperature so far today is 68F degrees, which is
8 degrees below the normal high of 76F. The minimum temperature
since midnight is 49 degrees, which is 9 degrees below the
normal low of 58F.

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Today’s Observations:

7 A.M.
Weather: Broken cirrostratus, broken cirrus, few stratocumulus
distant ENE-ESE
Temperature: 51F; Dew Point: 48F; Relative Humidity: 89%
Wind: NW @ 11 kts
Sea-level pressure: 1024.5 mb; 30.25 in. Hg: rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 54F
6-hr Min temp: 49F
24-hr Precip: 0.80 inches
BHO SA 1155 E220 BKN 250 BKN 80 245/51/48/3211/025/
FEW SC DSNT ENE-ESE/ 8/508 51024 70080 10054 20049

10 A.M.
Weather: Broken cirrostratus, broken cirrus, few cumulus distant
W-N
Temperature: 62F; Dew Point: 54F; Relative Humidity: 73%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1025.7 mb; 30.29 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E220 BKN 250 BKN 70 257/62/54/3305/029/ FEW CU DSNT W-N
WND LGT/ 8/208 51012

1 P.M.
Weather: Broken cirrus, few cumulus distant ESE-SE and distant
SW-NW-NNE
Temperature: 67F Dew Point: 51F; Relative Humidity: 57%
Wind: NW @ 2 kts, wind light and variable
Sea-level pressure: 1025.4 mb; 30.28 in. Hg: rising, then falling
Visibility: 70 miles
6-hr Max temp: 67F
6-hr Min temp: 51F
6-hr Precip: 0.00 inches
BHO SA 1755 E250 BKN 70 254/67/51/3202/028/ FEW CU DSNT ESE-SE
AND DSNT SW-NW-NNE WND L/V/ 8/202 58003 10067 20051

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SUMMARY FOR SUNDAY, SEPTEMBER 7, 2025

TEMPERATURE (DEGREES F)
MAX…….64   NORMAL…..76
MIN…….56   NORMAL…..59
MEAN……60   NORMAL…..67

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-7
TOTAL DEPARTURE FOR THE MONTH……………………….-1 [-0.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..5  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH……………..6  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON……………26  DEPARTURE………0
TOTAL HEATING UNITS LAST SEASON TO DATE……….14  DEPARTURE…….+12

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-4
TOTAL COOLING UNITS FOR THE MONTH…………….27  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON…………..699  DEPARTURE…….+73
TOTAL COOLING UNITS LAST SEASON TO DATE………716  DEPARTURE…….-17

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)………..16 WNW  @   11:05 P.M.
VECTOR #1 (1-Sec)……….16 NNE  @   09:18 A.M.
VECTOR #2 (1-Sec)……….19 N    @   09:20 A.M.
DAVIS #1……………….16 W    @   11:05 P.M.
DAVIS #2 ………………17 WNW  @   11:59 P.M.
RMY #1 (Instantaneous)…..15 N    @   08:13 A.M.
RMY #2 (Instantaneous)…..19 WNW  @   11:59 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……16 W    @   11:39 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 WNW  @   11:59 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..12 WNW  @   11:06 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13 WNW  @   11:58 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 W    @   11:06 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………12 WNW  @   11:58 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..11 N    @   08:22 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..13 WNW  @   11:58 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………12 WNW  @   11:06 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.0 N [143 total miles] VECTOR #1……………….6.6
VECTOR #2……………….6.8
DAVIS #1………………..6.2 N
DAVIS #2………………..5.9 NNE
RMY #1………………….6.4 N
RMY #2………………….6.7 N
RICHARDS (C5C)…………..6.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.80 DEPARTURE…..+0.68
TOTAL PRECIPITATION FOR THE MONTH…………..2.14 DEPARTURE…..+1.31
TOTAL PRECIPITATION FOR THE YEAR (2025)…….33.47 DEPARTURE…..-1.97

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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/-5/0.00/221/28            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 The low since midnight is 49F, the daily normal low is 58F.

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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 8
HIGH 97F IN 2015
LOW 42F IN 1978
PRECIP 1.51 INCHES IN 2011
PEAK GUST 45 MPH S IN 2012

RECORDS FOR SEPTEMBER 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978

TODAY’S REPORT PREPARED BY: Matt Douglas