Friday, September 26, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, SEPTEMBER 26, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0536E
SUNSET: 1734E
WARM AND HUMID WITH PLENTY OF SUNSHINE TODAY….
We received 1.76″ of rain yesterday, with the majority of
the precipitation falling in the earlier half of the day.
This brings the total for the month at 4.44″ which is +1.13″
above normal.
Temperatures have rebounded almost dramatically since yesterday,
with our high so far at 79F, which is 10 degrees above average
for this time of year. Dew points have also been on the high
side, staying in the mid 60s throughout the day. It hasn’t felt
too sticky despite this, though it feels much more like a summer
day today.
The wind has been mostly out of the west today, though during
the late morning it shifted slightly out of the west-northwest.
The average speed for the day so far is around 11mph. The peak
gust is 23mph so far, which occurred before 09:00am this
morning.
Visibility hovered between 50-70 miles throughout the day, with
the best visibility occuring after 10am.
The maximum temperature so far today is 79F degrees, which is
10 degrees above the normal high of 69F. The minimum temperature
since midnight is 63F degrees, which is 9 degrees above the
normal low of 52F.
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Today’s Observations:
7 A.M.
Weather: Broken altocumulus/altostratus, broken cirrocumulus/
cirrostratus, broken cirrus
Temperature: 64F; Dew Point: 62F; Relative Humidity: 94%
Wind: W @ 8 kts
Sea-level pressure: 1008.2 mb; 29.77 in. Hg: rising, then
more rapidly
Visibility: 50 miles
6-hr Max temp: 70F
6-hr Min temp: 63F
24-hr Precip: 1.49 inches
BHO SA 1155 E200 BKN 220 BKN 250 BKN 50 082/64/62/2708/977/
8/079 53017 70149 10070 20063
10 A.M.
Weather: Scattered cumulus, scattered altocumulus, scattered
cirrostratus
Temperature: 74F; Dew Point: 63F; Relative Humidity: 68%
Wind: WNW @ 7 kts
Sea-level pressure: 1009.3 mb; 29.80 in. Hg: rising, then
steady
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 45 SCT 180 SCT 250 SCT 70 093/74/63/2907/980/
8/256 51011
1 P.M.
Weather: Scattered cumulus, scattered altocumulus, scattered
cirrus
Temperature: 79F Dew Point: 64F; Relative Humidity: 60%
Wind: WNW @ 8 kts
Sea-level pressure: 1008.7 mb; 29.79 in. Hg: falling, then
more rapidly
Visibility: 70 miles
6-hr Max temp: 79F
6-hr Min temp: 64F
6-hr Precip: 0.00 inches
BHO SA 1755 45 SCT 180 SCT 250 SCT 70 087/79/64/3008/979/
8/254 58006
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SUMMARY FOR THURSDAY, SEPTEMBER 25, 2025
TEMPERATURE (DEGREES F)
MAX…….70 NORMAL…..69
MIN…….62 NORMAL…..52
MEAN……66 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+5
TOTAL DEPARTURE FOR THE MONTH……………………….-3 [-0.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH…………….41 DEPARTURE…….-27
TOTAL HEATING UNITS FOR THE SEASON……………61 DEPARTURE…….-25
TOTAL HEATING UNITS LAST SEASON TO DATE……….60 DEPARTURE……..+1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..1 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….42 DEPARTURE…….-28
TOTAL COOLING UNITS FOR THE SEASON…………..714 DEPARTURE…….+48
TOTAL COOLING UNITS LAST SEASON TO DATE………753 DEPARTURE…….-39
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)………..35 SSW @ 07:01 P.M.
VECTOR #1 (1-Sec)……….35 SSW @ 09:04 P.M.
VECTOR #2 (1-Sec)……….34 S @ 07:11 P.M.
DAVIS #1……………….39 S @ 07:51 P.M.
DAVIS #2 ………………43 S @ 08:00 P.M.
RMY #1 (Instantaneous)…..35 SSW @ 09:04 P.M.
RMY #2 (Instantaneous)…..36 S @ 07:00 P.M.
MERLIN…………………32 S
RICHARDS (C5C) (Inst)……34 SSW @ 06:55 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 SSW @ 06:56 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..24 SSW @ 08:51 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25 S @ 08:51 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 S @ 06:56 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………29 S @ 08:01 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 SSW @ 10:45 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 S @ 08:51 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23 SSW @ 06:56 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..12.3 ESE [296 total miles]
VECTOR #1………………12.5
VECTOR #2………………13.1
DAVIS #1……………….12.3 SSE
DAVIS #2……………….13.2 S
RMY #1…………………12.2 SSE
RMY #2…………………13.2 SSE
RICHARDS (C5C)………….12.2
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.49 DEPARTURE…..+1.33
TOTAL PRECIPITATION FOR THE MONTH…………..4.44 DEPARTURE…..+1.13
TOTAL PRECIPITATION FOR THE YEAR (2025)…….35.77 DEPARTURE…..-2.15
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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/+1/0.00/694/89 26 SSW VEC1 27 SSW RMY 28
9/5 82/63/73/+5/0.12/404/52 30 SSW VEC1 31 SSW RMY 33
9/6 84/64/74/+6/1.05/457/59 55 W VEC1 55 W RMY 57 TSTM
9/7 64/56/60/-7/0.97/000/00 16 WNW VEC1 16 NNE RMY 15
9/8 68/49/59/-8/0.00/508/66 21 NW VEC1 21 NW RMY 24
9/9 70/53/62/-5/0.00/697/91 22 ENE VEC1 23 E RMY 23
9/10 65/54/60/-6/0.00/183/24 24 NE VEC1 25 NE RMY 25
9/11 77/51/64/-2/0.00/714/94 21 N VEC1 17 N RMY 18
9/12 71/56/64/-2/0.00/735/97 24 ENE VEC1 24 NNE RMY 23
9/13 76/55/66/+1/T/634/84 26 S VEC1 26 S RMY 25
9/14 79/57/68/+3/0.00/572/76 15 NE VEC1 15 SW RMY 15
9/15 72/57/65/0/0.00/689/92 20 N VEC1 19 N RMY 18
9/16 71/55/63/-1/0.00/403/54 20 E VEC1 19 ESE RMY 19
9/17 71/55/63/-1/T/424/57 22 E VEC1 22 E RMY 21
9/18 75/61/68/+5/0.44/252/34 20 S VEC1 20 S RMY 20 TSTM
9/19 80/57/69/+6/0.00/715/97 24 N VEC1 24 N RMY 23
9/20 67/51/59/-4/0.00/705/96 20 SE VEC1 19 SE RMY 18
9/21 68/52/60/-2/0.00/593/81 18 ESE VEC1 19 SE RMY 19
9/22 73/53/63/+1/0.00/620/85 20 SSW VEC1 20 SW RMY 21
9/23 78/57/68/+6/0.00/305/42 25 SW VEC1 25 SW RMY 26
9/24 64/61/63/+2/0.19/000/00 21 E VEC1 21 E RMY 22
9/25 70/62/66/+5/1.67/000/00 35 SSW VEC1 35 SSW RMY 35 TSTM
9/26 The low since midnight is 63F, the daily normal low is 52F.
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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 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977
RECORDS FOR SEPTEMBER 27
HIGH 86F IN 2017
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)
TODAY’S REPORT PREPARED BY: Amanda Joly
