Friday, October 3, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY OCTOBER 3, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0544E
SUNSET: 1722E
BRILLIANT SUNSHINE, HIGH AND DRY WITH WARMING TEMPERATURES….
Today we have had plenty of blue sky with the exception of some
scattered cirrus clouds since mid morning. Compared to yesterday,
the chill in the air isn’t as obvious, as warmer, moist air from
the west-southwest has moved into the area. It seems as if the
pause button has been pushed on fall, with temperatures and dew
points rising yet again.
Temperatures have warmed quite a bit today, putting us slightly
above average for this time of year. The overnight low was 46F so
the day started off cool, but quickly warmed as we had all day
sunshine. Temperatures made it past the 70F mark as of the 1pm
observation. Dew points have also risen, starting from the upper
40s to 50F by 1pm today.
The wind continues to trend light, with a prominent west-southwest
flow. The average speed for the day so far is around 10mph. The
peak gust so far today is 23mph, which occurred just after the
final observation at 1:17pm.
Visibility has been impacted by the rising dew points and have
held steady around 50 miles throughout the day.
The maximum temperature so far today is 72F degrees, which is
6 degrees above the normal high of 66F. The minimum temperature
since midnight is 46F degrees, which is 3 degrees below the
normal low of 49F.
————————————————————–
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%
————————————————————–
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 50F; Dew Point: 47F; Relative Humidity: 88%
Wind: WSW @ 7 kts
Sea-level pressure: 1029.2 mb; 30.39 in. Hg: falling, then
more rapidly
Visibility: 50 miles
6-hr Max temp: 50F
6-hr Min temp: 47F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 50 292/50/47/2507/039/ FEW CI ALQDS/ 8/001
58004 10050 20047
10 A.M.
Weather: Scattered cirrus
Temperature: 63F; Dew Point: 49F; Relative Humidity: 60%
Wind: WSW @ 7 kts
Sea-level pressure: 1027.8 mb; 30.35 in. Hg: falling, then
more rapidly
Visibility: 50 miles
3-hr Precip: 0.00 inches
BHO SA 1455 250 SCT 50 278/63/49/2507/035/ 8/001 58014
1 P.M.
Weather: Scattered cirrus
Temperature: 71F Dew Point: 50F; Relative Humidity: 48%
Wind: WSW @ 8 kts
Sea-level pressure: 1025.4 mb; 30.28 in. Hg: falling, then
more rapidly
Visibility: 50 miles
6-hr Max temp: 72F
6-hr Min temp: 50F
6-hr Precip: 0.00 inches
BHO SA 1755 250 SCT 50 254/71/50/2408/028/ 8/001 58024 10072 20050
————————————————————–
SUMMARY FOR THURSDAY, OCTOBER 2, 2025
TEMPERATURE (DEGREES F)
MAX…….60 NORMAL…..66
MIN…….43 NORMAL…..49
MEAN……52 NORMAL…..58
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-6
TOTAL DEPARTURE FOR THE MONTH……………………….-9 [-4.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….13 DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE MONTH…………….23 DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE SEASON……………86 DEPARTURE…….-47
TOTAL HEATING UNITS LAST SEASON TO DATE……….80 DEPARTURE……..+6
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………..0 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE SEASON…………..736 DEPARTURE…….+64
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)………..28 NE @ 12:43 A.M.
VECTOR #1 (1-Sec)……….28 NE @ 12:43 A.M.
VECTOR #2 (1-Sec)……….31 NNE @ 12:43 A.M.
DAVIS #1……………….28 NE @ 12:43 A.M.
DAVIS #2 ………………30 ENE @ 12:43 A.M.
RMY #1 (Instantaneous)…..28 NE @ 12:43 A.M.
RMY #2 (Instantaneous)…..31 NNE @ 12:43 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……27 NE @ 12:43 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 NNE @ 01:42 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 NE @ 12:48 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 NNE @ 01:42 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NE @ 12:48 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 ENE @ 12:42 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 NE @ 12:48 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 NNE @ 01:42 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17 NE @ 12:43 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.7 NE [208 total miles]
VECTOR #1……………….9.1
VECTOR #2……………….9.8
DAVIS #1………………..9.3 ENE
DAVIS #2………………..9.4 ENE
RMY #1………………….9.1 ENE
RMY #2………………….9.6 NE
RICHARDS (C5C)…………..9.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.34
TOTAL PRECIPITATION FOR THE YEAR (2025)…….35.82 DEPARTURE…..-3.19
————————————————————–
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/+4/0.00/572/81 24 NE VEC1 25 NE RMY 24
————————————————————–
SEPTEMBER DAILY RECORDS TO DATE
NONE.
————————————————————–
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/…/.. 28 NE VEC1 28 NE RMY 28
10/3 The low since midnight is 46F, the daily normal low is 49F.
————————————————————–
OCTOBER 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 3
HIGH 82F IN 1922
LOW 28F IN 1899
PRECIP 1.76 INCHES IN 1979
PEAK GUST 62 MPH WNW IN 1964
RECORDS FOR OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990
TODAY’S REPORT PREPARED BY: Amanda Joly
