Thursday, October 2, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY OCTOBER 2, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0543E
SUNSET: 1723E
ABUNDANT SUNSHINE, BUT CONTINUED ON THE COOL SIDE….
Today has been another decent day with plenty of sun, low
humidity levels, and a more gentle breeze than yesterday. There
is definitely the feel of fall out there today which is
quite fitting for the start of October.
Temperatures are again on the cool side today with readings
starting the day in the low to mid 40s and only recovering to
just above 60F by early this afternoon. This is again a bit
below normal for early October. Dew point values have been in
the low 40s all day, giving another very refreshing day to the
region.
The wind has been lighter today than yesterday, but generally
steady ouf of the north to northeast. The average speed for
the day so far is around 10mph. The peak gust so far today is
28mph, which occurred just before 12:45am this morning.
Visibility has been excellent today, holding at around 80
miles all day!
The maximum temperature so far today is 61F degrees, which is
5 degrees below the normal high of 66F. The minimum temperature
since midnight is 43F degrees, which is 6 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 stratocumulus distant NNE-S, few cirrus
distant WSW-NW
Temperature: 47F; Dew Point: 40F; Relative Humidity: 77%
Wind: N @ 6 kts, wind light
Sea-level pressure: 1032.3 mb; 30.48 in. Hg: rising unsteadily
Visibility: 80 miles
6-hr Max temp: 52F
6-hr Min temp: 43F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 80 323/47/40/3606/048/ FEW SC DSNT NNE-S
FEW CI DSNT WSW-NW WND LGT/ 8/501 52024 10052 20043
10 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 56F; Dew Point: 42F; Relative Humidity: 59%
Wind: NE @ 8G15 kts, wind N variable ENE
Sea-level pressure: 1033.5 mb; 30.52 in. Hg: rising, then falling
Visibility: 80 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E35 BKN 250 BKN 80 335/56/42/0508G15/052/
WND 01V07/ 8/501 50012
1 P.M.
Weather: Clear, few stratocumulus all quadrants, few cirrus
distant SW-N
Temperature: 59F Dew Point: 44F; Relative Humidity: 57%
Wind: ENE @ 5 kts, wind light
Sea-level pressure: 1032.6 mb; 30.49 in. Hg: steady, then falling
Visibility: 80 miles
6-hr Max temp: 61F
6-hr Min temp: 47F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 80 326/59/44/0605/049/ FEW SC ALQDS
FEW CI DSNT SW-N WND LGT/ 8/501 58009 10061 20047
————————————————————–
SUMMARY FOR WEDNESDAY, OCTOBER 1, 2025
TEMPERATURE (DEGREES F)
MAX…….61 NORMAL…..67
MIN…….49 NORMAL…..50
MEAN……55 NORMAL…..58
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-3
TOTAL DEPARTURE FOR THE MONTH……………………….-3 [-3.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….10 DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………….10 DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE SEASON……………73 DEPARTURE…….-52
TOTAL HEATING UNITS LAST SEASON TO DATE……….74 DEPARTURE……..-1
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…….+65
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)………..30 NE @ 09:12 A.M.
VECTOR #1 (1-Sec)……….30 NE @ 09:11 A.M.
VECTOR #2 (1-Sec)……….31 NE @ 08:55 P.M.
DAVIS #1……………….29 NE @ 04:20 A.M.
DAVIS #2 ………………30 ENE @ 08:55 P.M.
RMY #1 (Instantaneous)…..30 NNE @ 08:22 A.M.
RMY #2 (Instantaneous)…..31 NE @ 08:55 P.M.
MERLIN…………………28 NNE
RICHARDS (C5C) (Inst)……27 NE @ 04:20 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 NE @ 09:04 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 NE @ 09:12 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 NE @ 08:56 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 NE @ 09:12 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 ENE @ 08:57 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 NE @ 04:20 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 NE @ 08:56 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 NE @ 09:12 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.5 NE [277 total miles]
VECTOR #1………………11.4
VECTOR #2………………12.3
DAVIS #1……………….12.2 NE
DAVIS #2……………….12.2 ENE
RMY #1…………………11.3 NE
RMY #2…………………11.9 NE
RICHARDS (C5C)………….11.7
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…..-0.17
TOTAL PRECIPITATION FOR THE YEAR (2025)…….35.82 DEPARTURE…..-3.02
————————————————————–
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 The low since midnight is 43F, 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 2
HIGH 85F IN 1968
LOW 29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 53 MPH ENE IN 2022
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
TODAY’S REPORT PREPARED BY: Matt Douglas
