Friday, August 29, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, AUGUST 29, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0507E
SUNSET: 1823E
RAIN IN THE AREA, THOUGH BLUE HILL REMAINS MOSTLY DRY TODAY….
Today has been mostly dry, though rain has been seen in the
areas surrounding the hill, but we have only received a trace
of precipitation, all before 7am this morning. Skies have been
mostly overcast with some breaks in overcast and a variety of
altostratus, cumulus, and altocumulus castelleanus clouds. By the
early afternoon we had some clearing, but rain showers and storms
could still be seen lingering to our WNW and ESE directions.
This means that we can’t quite count on staying dry today, as
the atmosphere is quite unstable.
Temperatures have been slow to warm today, and because of the
lack of sunshine and cooler upper air aloft, we are still about
5 degrees below what is expected for this time of year. We have
managed to make it to 73F, and overnight lows were warmer than
the previous day at 60F. The increase of the overnight temps
along with the rain and passing cold front has increased the
dew points, making it feel just a tad bit sticker than over the
past couple of days. We had dew points in the 40s yesterday but
today has been in the upper 50s and low 60s.
The wind has been steady today, averaging around 13mph. We had
a strong southerly flow from about 7pm last night and through
the morning hours until around 10am when winds became out of the
south-southeast. The peak gust for the day so far is around 29mph,
which occurred just after 10am this morning.
Visibility has been impacted today by the rising dew points and
the rain showers in the vicinity. We have had around 50 miles of
visibility throughout the day, with a little less in the afternoon
due to nearby showers obscuring our view.
The maximum temperature so far today is 73F degrees, which is
5 degrees below the normal high of 78F. The minimum temperature
since midnight is 60 degrees, which is 1 degree below the normal
low of 61F.
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Today’s Observations:
7 A.M.
Weather: Broken altocumulus castellanus, overcast altostratus,
few breaks in overcast all quadrants, virga NW and ENE-E
Temperature: 62F; Dew Point: 57F; Relative Humidity: 84%
Wind: S @ 9 kts
Sea-level pressure: 1017.3 mb; 30.04 in. Hg: rising, then falling
Visibility: 50 miles
6-hr Max temp: 62F
6-hr Min temp: 60F
24-hr Precip: Trace
BHO SA 1155 E60 BKN 90 OVC 50 173/62/57/1909/004/ FEW BINOVC ALQDS
HIER CLDS VSBL ALQDS VIRGA NW AND ENE-E RW-E06B18E49/ 8/08/ 50001
6000/ 70000 10062 20060
10 A.M.
Weather: Broken cumulus, overcast altocumulus/altostratus, few
breaks in overcast all quadrants, virga ESE-S, sun dimly visible
Temperature: 68F; Dew Point: 57F; Relative Humidity: 68%
Wind: S @ 11 kts
Sea-level pressure: 1016.4 mb; 30.01 in. Hg: falling steadily
Visibility: 50 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E40 BKN 85 OVC 50 164/68/57/1811/001/ FEW BINOVC ALQDS
VIRGA NE AND ESE-S SUN DMLY VSBL/ 8/27/ 57009 6000/
1 P.M.
Weather: Broken altocumulus castellanus, broken altocumulus/altostratus,
broken cirrus, cumulonimbus distant WNW-NW, towering cumulus SW-NNW,
few cumulus all quadrants
Temperature: 71F Dew Point: 62F; Relative Humidity: 73%
Wind: SSE @ 11 kts
Sea-level pressure: 1014.7 mb; 29.96 in. Hg: falling, then more
rapidly
Visibility: 30 miles
6-hr Max temp: 73F
6-hr Min temp: 62F
6-hr Precip: 0.00 inches
BHO SA 1755 E65 BKN 100 BKN 200 BKN 30 147/71/62/1611/996/ FEW CB
DSNT WNW-NW TCU SW-NNW FEW CU ALQDS/ 8/393 58017 10073 20062
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SUMMARY FOR THURSDAY, AUGUST 28, 2025
TEMPERATURE (DEGREES F)
MAX…….77 NORMAL…..79
MIN…….52 NORMAL…..61
MEAN……65 NORMAL…..70
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5
TOTAL DEPARTURE FOR THE MONTH………………………-45 [-1.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….16 DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE SEASON……………17 DEPARTURE……..+1
TOTAL HEATING UNITS LAST SEASON TO DATE……….10 DEPARTURE……..+7
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…….-33
TOTAL COOLING UNITS FOR THE SEASON…………..672 DEPARTURE…….+91
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)………..31 WNW @ 05:09 P.M.
VECTOR #1 (1-Sec)……….31 NW @ 04:44 P.M.
VECTOR #2 (1-Sec)……….31 WNW @ 04:46 P.M.
DAVIS #1……………….32 W @ 05:02 P.M.
DAVIS #2 ………………29 WNW @ 03:53 P.M.
RMY #1 (Instantaneous)…..31 NW @ 05:09 P.M.
RMY #2 (Instantaneous)…..32 WNW @ 05:09 P.M.
MERLIN…………………29 NW
RICHARDS (C5C) (Inst)……29 @ 05:10 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 SSW @ 04:49 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 04:49 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 04:47 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 SSW @ 04:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 SSW @ 04:47 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 SSW @ 04:49 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 SSW @ 04:47 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20 @ 04:49 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.7 WSW [256 total miles]
VECTOR #1………………10.9
VECTOR #2………………11.5
DAVIS #1……………….10.9 SW
DAVIS #2……………….11.8 WSW
RMY #1…………………10.5 WSW
RMY #2…………………11.5 WSW
RICHARDS (C5C)………….10.8
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..1.82 DEPARTURE…..-1.74
TOTAL PRECIPITATION FOR THE YEAR (2025)…….31.27 DEPARTURE…..-2.99
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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 The low since midnight is 60F, the daily normal low is 61F.
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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 29
HIGH 95F IN 1953
LOW 41F IN 1982
PRECIP 2.88 INCHES IN 1962
PEAK GUST 70e MPH S IN 1949
RECORDS FOR AUGUST 30
HIGH 94F IN 1953
LOW 39F IN 1965
PRECIP 2.75 INCHES IN 1936
PEAK GUST 43 MPH NW IN 1965
TODAY’S REPORT PREPARED BY: Amanda Joly
