Wednesday, October 1, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY OCTOBER 1, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0542E
SUNSET: 1725E
MAINLY SUNNY AND COOL WITH A BRISK WIND AND EXCELLENT VISIBILITY….
Today has been a really decent day despite the gusty wind and
cool temperatures. Sunshine has been the theme all day with only
some stratocumulus clouds passing by at times.
Temperatures are much cooler today with readings starting the
day in the upper 40s and only recovering to the low 60s. This is
a bit below normal for the start of October. Dew point values
have been in the mid 40s all day, indicative of a refreshing
air mass over the region.
The wind has been busy today out of mainly the northeast. The
average speed for the day so far is around 12mph. Gusts have
been frequently exceeding 20mph today, with a peak of 29mph
which has occurred twice, once around 4:20am and again just
after 9am this morning.
Visibility has been excellent today, holding at around 70-80
miles!
The maximum temperature so far today is 61F degrees, which is
6 degrees below the normal high of 67F. The minimum temperature
since midnight is 49F degrees, which is 1 degree below the normal
low of 50F.
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PRELIMINARY STATS FOR SEPTEMBER 2025
TEMPERATURE, Deg. F
Avg. Max. 74.1 [+1.4]
Avg. Min. 56.8 [+1.2]
Mean 65.5 [+1.3]
24-hour corrected mean: 64.3
Max. for month: 84F on the 6th
Min. for month: 49F on the 8th
HEATING DEGREE DAYS
Total heating units: 43 [-057]
Total for the season: 63 [-055]
Total for last season: 70
COOLING DEGREE DAYS
Total cooling units: 64 [-010]
Total for the season: 736 [+066]
Total for last season: 757
PRECIPITATION, Inches
Total: 4.49 [+0.43]
Greatest in 24 hrs: 2.02 on the 6th-7th
SNOWFALL, Inches
Total: 0.0 [ 0.0]
Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 8.6 mph
Avg. corrected wind speed: 9.4 mph
Prevailing wind direction: South-southwest [12%]
Peak gust and direction: 55 SSW on the 5th
SUNSHINE:
Campbell-Stokes card minutes: 14190 of a possible 21582, or 66%
Astronomical total minutes: 14736 of a possible 22421 or 66%
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Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus distant N-E-S
Temperature: 51F; Dew Point: 45F; Relative Humidity: 78%
Wind: N @ 8G17 kts
Sea-level pressure: 1022.4 mb; 30.19 in. Hg: steady, then rising
Visibility: 70 miles
6-hr Max temp: 54F
6-hr Min temp: 49F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 70 224/51/45/0108G17/019/ FEW SC DSNT N-E-S/
8/500 53006 10054 20049
10 A.M.
Weather: Scattered stratocumulus
Temperature: 58F; Dew Point: 44F; Relative Humidity: 59%
Wind: NNE @ 13G21 kts
Sea-level pressure: 1023.7 mb; 30.23 in. Hg: rising unsteadily
Visibility: 80 miles
3-hr Precip: 0.00 inches
BHO SA 1455 25 SCT 80 237/58/44/0313G21/023/ 8/500 52013
1 P.M.
Weather: Clear, few stratocumulus all quadrants
Temperature: 59F Dew Point: 44F; Relative Humidity: 56%
Wind: ENE @ 11G21 kts
Sea-level pressure: 1023.1 mb; 30.21 in. Hg: falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 61F
6-hr Min temp: 51F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 80 231/59/44/0711G21/021/ FEW SC ALQDS/ 8/500
58006 10061 20051
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SUMMARY FOR TUESDAY, SEPTEMBER 30, 2025
TEMPERATURE (DEGREES F)
MAX…….71 NORMAL…..67
MIN…….55 NORMAL…..50
MEAN……63 NORMAL…..59
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+4
TOTAL DEPARTURE FOR THE MONTH………………………+45 [+1.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..2 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………….43 DEPARTURE…….-57
TOTAL HEATING UNITS FOR THE SEASON……………63 DEPARTURE…….-55
TOTAL HEATING UNITS LAST SEASON TO DATE……….70 DEPARTURE……..-7
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….64 DEPARTURE…….-10
TOTAL COOLING UNITS FOR THE SEASON…………..736 DEPARTURE…….+66
TOTAL COOLING UNITS LAST SEASON TO DATE………757 DEPARTURE…….-21
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)………..24 NE @ 09:53 A.M.
VECTOR #1 (1-Sec)……….25 NE @ 09:53 A.M.
VECTOR #2 (1-Sec)……….25 NE @ 09:53 A.M.
DAVIS #1……………….23 NE @ 09:53 A.M.
DAVIS #2 ………………22 ENE @ 12:55 P.M.
RMY #1 (Instantaneous)…..24 NNE @ 11:50 P.M.
RMY #2 (Instantaneous)…..24 NE @ 09:53 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……24 NE @ 09:53 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 E @ 11:56 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 NE @ 09:55 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 ENE @ 03:42 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 NE @ 09:55 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 ENE @ 09:55 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 NE @ 09:55 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 ENE @ 03:42 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16 NE @ 09:55 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.5 ENE [251 total miles]
VECTOR #1………………10.3
VECTOR #2………………11.1
DAVIS #1……………….11.0 NNE
DAVIS #2……………….10.6 NE
RMY #1…………………10.4 NNE
RMY #2…………………10.9 NNE
RICHARDS (C5C)………….10.7
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..4.49 DEPARTURE…..+0.43
TOTAL PRECIPITATION FOR THE YEAR (2025)…….35.82 DEPARTURE…..-2.85
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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 80/63/72/+12/0.00/625/87 24 NW VEC1 23 WNW RMY 27
9/27 80/59/70/+10/0.00/443/62 20 S VEC1 20 S RMY 18
9/28 81/63/72/+13/0.05/534/75 22 N VEC1 22 N RMY 22
9/29 78/58/68/+9/0.00/604/85 18 W VEC1 18 N RMY 18
9/30 71/55/63/+4/0.00/…/.. 24 NE VEC1 25 NE RMY 24
10/01 The low since midnight is 49F, the daily normal low is 50F.
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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 OCTOBER 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.63 INCHES IN 2014
PEAK GUST 68e MPH SSE IN 1977
RECORDS FOR OCTOBER 2
HIGH 85F IN 1968
LOW 29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 53 MPH ENE IN 2022
TODAY’S REPORT PREPARED BY: Amanda Joly/Matt Douglas
