Sunday, August 31, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, AUGUST 31, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0509E
SUNSET: 1819E
MOSTLY CLEAR SKIES AND COMFORTABLE CONDITIONS ATOP GREAT
BLUE HILL TODAY!….
Today has been a top ten day on the summit, with mostly clear
skies and plenty of bright sunshine. A few altocumulus and
cirrus clouds were seen in the distance, and by the afternoon
few cumulus were seen due to daytime surface heating. What an
incredible way to close out meteorological summer today!
Temperatures have continued to be slightly below normal, and
with dew points in the low 50s, the dry air has made for another
comfortable day for any outdoor activity or frolicking. Overnight
temperatures got down to around 53F and had rebounded quite
quickly after sunrise.
The wind has been on the light side today, only averaging around
8mph. Wind flow started out of the north-northwest today and by
the afternoon, winds have switched to a more northeasterly flow.
The peak gust for the day so far is 18mph, which occurred just
after 8am this morning.
Visibility has been excellent today thanks to the nice dry air.
The view has been generally 70-80 miles throughout the day. There
was a smoke layer aloft this morning, but it did not impact the
visibility overall. By midmorning there were nothing but clear,
crisp blue skies.
The maximum temperature so far today is 75F degrees, which is
3 degrees below the normal high of 78F. The minimum temperature
since midnight is 53 degrees, which is 7 degrees below the normal
low of 60F.
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Today’s Observations:
7 A.M.
Weather: Clear, few altocumulus distant NE, few cirrus
distant ENE-SSE
Temperature: 58F; Dew Point: 52F; Relative Humidity: 80%
Wind: NNW @ 7 kts
Sea-level pressure: 1022.4 mb; 30.19 in. Hg: rising, then
more slowly
Visibility: 70 miles, smoke layer aloft WSW-WNW
6-hr Max temp: 58F
6-hr Min temp: 53F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 70 224/58/52/3307/019/ FEW AC DSNT NE FEW CI
DSNT ENE-SSE K LYR ALF WSW-WNW/ 8/051 51013 10058 20053
10 A.M.
Weather: Clear, few altocumulus distant WNW-NW and NNE-ESE,
few cirrus distant E-SSE
Temperature: 68F; Dew Point: 52F; Relative Humidity: 55%
Wind: NNE @ 4 kts, wind light
Sea-level pressure: 1021.3 mb; 30.16 in. Hg: rising, then
more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 80 213/70/51/0204/016/ FEW AC DSNT WNW-NW
AND NNE-ESE FEW CI DSNT E-SSE WND LGT/ 8/051 51011
1 P.M.
Weather: Broken cumulus, broken cirrus
Temperature: 74F Dew Point: 51F; Relative Humidity: 45%
Wind: NE @ 5 kts, wind light
Sea-level pressure: 1020.8 mb; 30.14 in. Hg: falling unsteadily
Visibility: 70 miles
6-hr Max temp: 75F
6-hr Min temp: 58F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 70 208/74/51/0305/014/ FEW CU ALQDS FEW AC
DSNT NNE-SSE-W FEW CI DSNT E-ESE WND LGT/ 8/251 57005 10075
20058
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SUMMARY FOR SATURDAY, AUGUST 30, 2025
TEMPERATURE (DEGREES F)
MAX…….75 NORMAL…..78
MIN…….52 NORMAL…..61
MEAN……64 NORMAL…..69
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5
TOTAL DEPARTURE FOR THE MONTH………………………-54 [-1.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….19 DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE SEASON……………19 DEPARTURE……..+2
TOTAL HEATING UNITS LAST SEASON TO DATE……….11 DEPARTURE……..+8
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE MONTH……………161 DEPARTURE…….-43
TOTAL COOLING UNITS FOR THE SEASON…………..672 DEPARTURE…….+81
TOTAL COOLING UNITS LAST SEASON TO DATE………689 DEPARTURE…….-17
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
F420C (Official)………..21 W @ 12:08 P.M.
VECTOR #1 (1-Sec)……….21 W @ 12:08 P.M.
VECTOR #2 (1-Sec)……….20 NW @ 12:01 P.M.
DAVIS #1……………….20 NW @ 10:28 A.M.
DAVIS #2 ………………20 WNW @ 10:13 A.M.
RMY #1 (Instantaneous)…..22 NW @ 10:27 A.M.
RMY #2 (Instantaneous)…..21 NW @ 12:01 P.M.
MERLIN…………………20 NW
RICHARDS (C5C) (Inst)……21 @ 10:27 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 NW @ 10:29 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 12:09 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 10:15 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 W @ 12:10 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 WNW @ 10:15 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 NW @ 10:29 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 WNW @ 10:15 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 @ 10:29 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.8 WNW [211 total miles]
VECTOR #1……………….9.0
VECTOR #2……………….9.6
DAVIS #1………………..M
DAVIS #2………………..9.3 NW
RMY #1………………….8.7 WNW
RMY #2………………….9.3 WNW
RICHARDS (C5C)…………..9.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..1.88 DEPARTURE…..-1.92
TOTAL PRECIPITATION FOR THE YEAR (2025)…….31.33 DEPARTURE…..-3.17
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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
8/1 71/57/64/-9/0.44/546/63 28 NE VEC1 28 NE RMY 27
8/2 75/54/65/-8/0.00/838/97 18 NNW VEC1 18 NNW RMY 18
8/3 83/59/71/-2/0.00/784/91 21 SSW VEC1 21 SSW RMY 21
8/4 84/61/73/0/0.00/757/88 17 W VEC1 17 W RMY 17
8/5 73/62/68/-5/0.00/480/56 28 NE VEC1 27 NE RMY 28
8/6 77/61/69/-4/0.00/248/29 17 ENE VEC1 17 ENE RMY 16
8/7 81/61/71/-2/0.00/665/78 18 ESE VEC1 18 ESE RMY 17
8/8 83/61/72/0/0.00/834/98 21 SSW VEC1 21 SSW RMY 21
8/9 83/60/72/0/0.00/814/96 22 S VEC1 22 SSW RMY 22
8/10 89/61/75/+3/0.00/761/90 22 S VEC1 22 S RMY 21
8/11 94/67/81/+9/0.00/792/94 20 W VEC1 19 W RMY 19
8/12 93/68/81/+9/0.00/806/96 21 SSW VEC1 21 SSW RMY 21
8/13 88/66/77/+5/0.00/344/41 25 SW VEC1 25 SW RMY 25
8/14 90/68/79/+7/0.68/426/51 35 NE VEC1 34 NE RMY 36 TSTM
8/15 75/63/69/-3/0.00/783/96 29 NE VEC1 29 ENE RMY 31
8/16 86/62/74/+2/0.00/730/88 23 S VEC1 24 S RMY 23
8/17 89/64/77/+5/0.19/414/50 41 NE VEC1 43 NE RMY 42 TSTM
8/18 68/55/62/-9/0.00/627/76 32 NE VEC1 34 NE RMY 34
8/19 73/54/64/-7/0.00/560/68 20 SE VEC1 19 SE RMY 18
8/20 63/51/57-14/0.51/008/01 22 ENE VEC1 22 ENE RMY 21
8/21 67/54/61/-10/T/303/37 36 ENE VEC1 35 NE RMY 36
8/22 79/53/66/-5/0.00/774/95 24 N VEC1 25 N RMY 25
8/23 85/60/73/+2/0.00/771/95 33 SSW VEC1 33 SSW RMY 35
8/24 80/60/70/-1/0.00/632/78 33 SSW VEC1 35 SSW RMY 34
8/25 83/63/73/+3/T/533/66 23 WSW VEC1 22 SW RMY 23
8/26 77/59/68/-2/0.00/765/95 28 WNW VEC1 27 WNW RMY 28
8/27 75/57/66/-4/T/634/79 26 WNW VEC1 26 NW RMY 27
8/28 77/52/65/-5/T/…/.. 31 SSW VEC1 31 SSW RMY 31
8/29 73/59/66/-4/0.06/…/.. 29 SSE VEC1 29 SSE RMY 29
8/30 75/52/64/-5/0.00/…/.. 21 W VEC1 21 W RMY 22
8/31 The low since midnight is 53F, the daily normal low is 60F.
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AUGUST 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 AUGUST 31
HIGH 94F IN 1953
LOW 42F IN 1976
PRECIP 2.46 INCHES IN 1954
PEAK GUST 125 MPH SE IN 1954 [CAROL – RECORD FOR MONTH]
RECORDS FOR SEPTEMBER 1
HIGH 93F IN 1969, 2010
LOW 47F IN 1975, 2017
PRECIP 2.32 INCHES IN 2013
PEAK GUST 59e MPH S IN 1945, SSW IN 1965
TODAY’S REPORT PREPARED BY: Amanda Joly
