Wednesday, October 15, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, OCTOBER 15, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0557E
SUNSET: 1702E
COASTAL STORM FINALLY DEPARTED, FILTERED SUNSHINE WITH MILDER
TEMPERATURES TODAY….
The coastal storm finally ended late last night leaving a storm
total rainfall of 3.54″ here at Blue Hill. This was definitely
much needed rainfall that was beneficial since it was a long
duration event as opposed to a quick hitting downpour. The monthly
surplus is just over 2″ through today, but we are still hanging on
to a deficit for the year, although that has come down to under
1 inch for the time being.
Today is featuring a lot of cloud cover, with some sunshine
filtering through, especially during the morning hours. Clouds
did increase in both coverage and density for a time as a weak
frontal boundary pushed through.
With some sunshine and a wind no longer off the ocean, temperature
readings recovered today into the lower 60s. After a few days
of a damp and raw chill, it feels rather nice out there early this
afternoon. Dew point values remained somewhat elevated during the
morning, but are now dropping off early this afternoon as some
cold air advection is taking place following the frontal passage.
Readings have dropped from low to mid 50s into the mid 40s so far.
Winds diminished markedly overnight and through this morning, but
have picked up early this afternoon once again during and after
the frontal passage. A generally north to north-northwest flow has
been the theme today, so far averaging at around 9mph for the
day. There was some sporadic gustiness at times this morning, but
it has become much more prevalent this afternoon. The peak gust
so far for the day is 30mph, which occurred just before 12:15pm
this afternoon.
Visibility has improved today, from 40 miles during the morning
hours upto 70 miles early this afternoon following the frontal
passage.
The maximum temperature so far today is 62F degrees, which is
1 degree above the normal high of 61F. The minimum temperature
since midnight is 50F degrees, which is 6 degrees above the
normal low of 44F.
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Today’s Observations:
7 A.M.
Weather: Broken cirrus, few stratocumulus distant E-SSW
Temperature: 51F; Dew Point: 51F; Relative Humidity: 100%
Wind: NNW @ 8 kts
Sea-level pressure: 1014.5 mb; 29.96 in. Hg: falling, then rising
Visibility: 40 miles, thin fog
6-hr Max temp: 52F
6-hr Min temp: 50F
24-hr Precip: 0.24 inches
BHO SA 1155 E250 BKN 40 145/51/51/3308/996/ FEW SC DSNT E-SSW
THN F ALQDS PTCHY GF ALQDS/ 8/502 55001 70024 10052 20050
10 A.M.
Weather: Scattered altocumulus/altostratus, broken cirrostratus,
broken cirrus, few stratocumulus all quadrants
Temperature: 57F; Dew Point: 52F; Relative Humidity: 85%
Wind: N @ 5 kts, wind light
Sea-level pressure: 1014.0 mb; 29.94 in. Hg: rising, then falling
Visibility: 40 miles
3-hr Precip: 0.00 inches
BHO SA 1455 60 SCT E200 BKN 250 BKN 40 140/57/52/3505/994/
FEW SC ALQDS WND LGT/ 8/576 58005
1 P.M.
Weather: Scattered stratocumulus, broken altocumulus/altostratus,
broken cirrus, virga all quadrants
Temperature: 58F Dew Point: 453F; Relative Humidity: 62%
Wind: NNW @ 13G22 kts, peak wind NNW 30mph at 12:13 P.M.
Sea-level pressure: 1011.7 mb; 29.88 in. Hg: falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 62F
6-hr Min temp: 51F
6-hr Precip: 0.00 inches
BHO SA 1755 36 SCT E120 BKN 250 BKN 70 117/58/45/3313G22/988/
VIRGA ALQDS PK WND 3426/13/ 8/571 56023 10062 20051
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SUMMARY FOR TUESDAY, OCTOBER 14, 2025
TEMPERATURE (DEGREES F)
MAX…….53 NORMAL…..62
MIN…….50 NORMAL…..45
MEAN……52 NORMAL…..53
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-1
TOTAL DEPARTURE FOR THE MONTH………………………+40 [+2.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….13 DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………111 DEPARTURE…….-26
TOTAL HEATING UNITS FOR THE SEASON…………..174 DEPARTURE…….-80
TOTAL HEATING UNITS LAST SEASON TO DATE………193 DEPARTURE…….-19
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….20 DEPARTURE…….+14
TOTAL COOLING UNITS FOR THE SEASON…………..756 DEPARTURE…….+80
TOTAL COOLING UNITS LAST SEASON TO DATE………757 DEPARTURE……..-1
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 *=Last of multiple occurrences
F420C (Official)………..36 NE @ 02:37 A.M.
VECTOR #1 (1-Sec)……….36 NNE @ 12:35 A.M.
VECTOR #2 (1-Sec)……….37 NNE @ 12:36 A.M.
DAVIS #1……………….32 NNE @ 12:36 A.M.
DAVIS #2 ………………32 ENE @ 03:20 A.M.
RMY #1 (Instantaneous)…..35 NNE @ 12:35 A.M.
RMY #2 (Instantaneous)…..36 NNE @ 12:36 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……32 NNE @ 12:35 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 NNE @ 02:17 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 NNE @ 04:27 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 NNE @ 04:27 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 NE @ 04:27 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 NE @ 04:27 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 NNE @ 04:27 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 NNE @ 04:27 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21 NNE @ 04:27 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..12.0 NNE [287 total miles]
VECTOR #1………………12.1
VECTOR #2………………12.7
DAVIS #1……………….12.1 NE
DAVIS #2……………….12.1 NE
RMY #1…………………11.7 NNE
RMY #2…………………12.3 NNE
RICHARDS (C5C)………….12.1
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.24 DEPARTURE…..+0.07
TOTAL PRECIPITATION FOR THE MONTH…………..4.34 DEPARTURE…..+1.97
TOTAL PRECIPITATION FOR THE YEAR (2025)…….40.16 DEPARTURE…..-0.88
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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
10/1 61/49/55/-3/0.00/668/97 30 NE VEC1 30 NE RMY 30
10/2 60/43/52/-6/0.00/637/91 28 NE VEC1 28 NE RMY 28
10/3 72/46/59/+2/0.00/670/96 23 SW VEC1 23 SW RMY 23
10/4 81/53/67/+10/0.00/667/96 18 NNW VEC1 18 NW RMY 19
10/5 84/62/73/+16/0.00/664/96 18 SSW VEC1 18 SSW RMY 18
10/6 83/59/71/+15/0.00/649/94 25 SSW VEC1 25 SSW RMY 26
10/7 79/59/69/+13/0.00/440/64 35 SSW VEC1 35 SSW RMY 36
10/8 68/49/59/+4/0.80/027/04 33 NW VEC1 34 SSW RMY 35 TSTM
10/9 55/40/48/-7/0.00/…/.. 33 NNW VEC1 35 NNW RMY 35
10/10 61/38/50/-5/0.00/…/.. 25 SSW VEC1 26 S RMY 26
10/11 66/49/58/+4/0.00/…/.. 21 SW VEC1 21 SW RMY 20
10/12 56/52/54/0/0.91/…/.. 50 ENE VEC1 50 ENE RMY 52
10/13 53/50/52/-2/2.14/…/.. 51 ENE VEC1 51 ENE RMY 51
10/14 53/50/52/-1/0.49/…/.. 36 NE VEC1 36 NNE RMY 35
10/15 The low since midnight is 50F, the daily normal low is 44F.
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OCTOBER DAILY RECORDS TO DATE
10/5 HIGH MINIMUM TEMPERATURE OF 62F,
TIED THE RECORD FOR THE DATE WITH 1910
10/6 HIGH MAXIMUM TEMPERATURE OF 83F,
TIED THE RECORD FOR THE DATE WITH 1990 AND 2007
10/13 PEAK GUST OF 51 MPH ENE,
BEAT THE OLD RECORD OF 46e MPH W IN 1950
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR OCTOBER 15
HIGH 83F IN 1897
LOW 29F IN 1887,1937
PRECIP 4.58 INCHES IN 2005
SNOWFALL TRACE IN 1961,1972
PEAK GUST 69 MPH W IN 2003
RECORDS FOR OCTOBER 16
HIGH 86F IN 1897
LOW 28F IN 1886
PRECIP 2.82 INCHES IN 1974
SNOWFALL TRACE IN 2009
PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL)
TODAY’S REPORT PREPARED BY: Matt Douglas
