Monday, October 20, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, OCTOBER 20, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0603E
SUNSET: 1654E
BREEZY AND MILD WITH A BAND OF MODERATE TO HEAVY RAIN PASSING
THROUGH….
A cold frontal system associated with an area of low pressure
moving over upstate New York and northern Vermont has been
pushing through the region this morning into early this
afternoon. A band of showers, which were occasionally moderate
to heavy moved through bringing 0.75″ of rain to Blue Hill
through 1pm.
Temperatures are mild and a bit above normal for the date
with readings reaching the mid 60s for a time. However the
front has pushed through and temperatures have dropped back
into the 50s early this afternoon. It has also been rather
humid today with the dew point also for a time reaching the
mid 60s before scaling back following the frontal passage.
Winds have been busy, especially during the first half of the
day. A south-southeast flow overnight through this morning has
now shifted to the southwest following the front. The average
speed for the day so far is around 18mph. Gusts were frequently
exceeding 30mph during the morning hours with a peak gust of
40mph occurring just before 9am this morning.
Visibility has been limited due to the rain and fog. We started
the day with around 25 miles of visibility, then it dropped to
under 1/2 mile for a time from the mid to late morning hours.
It has improved early this afternoon with up to 60 miles being
seen from the south through west-northwest, but still only
around 25 miles from the north-northwest to east.
The maximum temperature so far today is 64F degrees, which is
4 degrees above the normal high of 60F. The minimum temperature
since midnight is 56F degrees, which is 14 degrees above the
normal low of 42F.
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Today’s Observations:
7 A.M.
Weather: Overcast stratocumulus, few breaks in overcast overhead,
higher clouds visible overhead
Temperature: 62F; Dew Point: 59F; Relative Humidity: 90%
Wind: SSE @ 16G26 kts, peak wind SSE 35mph at 6:24 A.M.
Sea-level pressure: 1009.7 mb; 29.82 in. Hg: falling, then steady
Visibility: 25 miles, thin fog
6-hr Max temp: 62F
6-hr Min temp: 57F
24-hr Precip: Trace
BHO SA 1155 E10 OVC 25 097/62/59/1516G26/982/ FEW BINOVC OVHD
HIER CLDS VSBL OVHD THN F ALQDS PK WND 1630/24/ 8/5// 56020
6000/ 70000 10062 20057
10 A.M.
Weather: Sky obscured, vertical visibility 300ft, light rain showers
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: S @ 16G30 kts, peak wind SSE 38mph at 9:13 A.M.
Sea-level pressure: 1007.9 mb; 29.76 in. Hg: falling, then more slowly
Visibility: 1/2 mile, fog
3-hr Precip: 0.33 inches
BHO SA 1455 X W3 1/2RW-F 079/63/63/1716G30/976/ PK WND 1633/13/
8//// 56018 6033/
1 P.M.
Weather: Broken stratocumulus, broken nimbostratus,
overcast cirrostratus, few breaks in overcast distant S-WNW
Temperature: 57F Dew Point: 56F; Relative Humidity: 98%
Wind: SSW @ 16G22 kts, peak wind S 32mph at 12:02 P.M.
Sea-level pressure: 1005.3 mb; 29.69 in. Hg: falling, then more slowly
Visibility: 40 miles, 25 miles NNW-E, 60 miles S-WNW
6-hr Max temp: 64F
6-hr Min temp: 57F
6-hr Precip: 0.75 inches
BHO SA 1755 E20 BKN 80 BKN 180 OVC 40 053/57/56/2016G22/969/
FEW BINOVC DSNT S-WNW FEW CB DSNT WSW-W FEW LWR STFRA ALQDS
FEW MDT CU DSNT S-WNW THN F NNW-E VIRGA ALQDS RW-BE47 VSBY 25 NNW-E
60 S-WNW PK WND 1828/02/ 8/828 56026 6075/ 10064 20057
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SUMMARY FOR SUNDAY, OCTOBER 19, 2025
TEMPERATURE (DEGREES F)
MAX…….68 NORMAL…..60
MIN…….50 NORMAL…..43
MEAN……59 NORMAL…..51
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+8
TOTAL DEPARTURE FOR THE MONTH………………………+41 [+2.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..6 DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE MONTH……………175 DEPARTURE…….-27
TOTAL HEATING UNITS FOR THE SEASON…………..238 DEPARTURE…….-82
TOTAL HEATING UNITS LAST SEASON TO DATE………272 DEPARTURE…….-34
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…….+79
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)………..28 SSE @ 07:15 P.M.
VECTOR #1 (1-Sec)……….29 SSE @ 07:15 P.M.
VECTOR #2 (1-Sec)……….30 SSE @ 07:13 P.M.
DAVIS #1……………….29 S @ 01:48 P.M.
DAVIS #2 ………………35 S @ 02:55 P.M.
RMY #1 (Instantaneous)…..28 SSE @ 07:13 P.M.
RMY #2 (Instantaneous)…..31 SSE @ 07:24 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……27 SSE @ 07:13 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SSE @ 10:57 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 SSE @ 07:15 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20 SSE @ 06:58 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 S @ 01:34 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S @ 01:31 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 SSE @ 10:49 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 SSE @ 07:15 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20 SSE @ 10:49 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..12.7 S [304 total miles]
VECTOR #1………………13.1
VECTOR #2………………13.9
DAVIS #1……………….12.5 S
DAVIS #2………………….M
RMY #1…………………12.6 S
RMY #2…………………14.0 S
RICHARDS (C5C)………….12.7
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..4.34 DEPARTURE…..+1.05
TOTAL PRECIPITATION FOR THE YEAR (2025)…….40.16 DEPARTURE…..-1.80
————————————————————–
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/-7/0.00/667/98 33 NNW VEC1 35 NNW RMY 35
10/10 61/38/50/-5/0.00/664/98 25 SSW VEC1 26 S RMY 26
10/11 66/49/58/+4/0.00/243/36 21 SW VEC1 21 SW RMY 20
10/12 56/52/54/0/0.91/000/00 50 ENE VEC1 50 ENE RMY 52
10/13 53/50/52/-2/2.14/000/00 51 ENE VEC1 51 ENE RMY 51
10/14 53/50/52/-1/0.49/000/00 36 NE VEC1 36 NNE RMY 35
10/15 62/44/53/0/T/319/48 33 NNW VEC1 33 NNW RMY 35
10/16 53/39/46/-6/0.00/…/.. 35 NW VEC1 35 NW RMY 36
10/17 61/41/51/-1/0.00/…/.. 26 N VEC1 26 N RMY 27
10/18 63/40/52/0/0.00/…/.. 17 SSE VEC1 16 NNW RMY 17
10/19 68/50/59/+8/0.00/…/.. 28 SSE VEC1 29 SSE RMY 28
10/20 The low since midnight is 56F, the daily normal low is 42F.
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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 20
HIGH 78F IN 1965,1984
LOW 24F IN 1972
PRECIP 7.10 INCHES IN 1996 (RECORD FOR MONTH)
SNOWFALL TRACE IN 1934,1943
PEAK GUST 63 MPH W IN 1966
RECORDS FOR OCTOBER 21
HIGH 82F IN 2024
LOW 24F IN 1974
PRECIP 2.34 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1941
PEAK GUST 69e MPH S IN 1976
TODAY’S REPORT PREPARED BY: Matt Douglas
