Friday, August 15, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, AUGUST 15, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0452E
SUNSET: 1845E
SUNSHINE WITH SOME CLOUDS, MUCH COOLER WITH A BRISK ONSHORE WIND….
A thunderstorm rolled through the area last evening along
what appears to have been a backdoor cold front. 0.68″ of rain
was measured from this storm, the first rainfall of any kind
(including a trace) since the 1st of the month! A much cooler
and a bit less humid air mass has taken over giving us a rather
pleasant day out there today. Varying amounts of cloud cover
passed over the area during the morning hours, but have since
mostly moved out leaving us with plenty of sunshine early this
afternoon.
Temperatures have only reached the mid 70s by early this
afternoon, which is a welcomed change from the upper 80s and
90s we experienced earlier in the week. Dew point values are
a solid 10F degree lower than yesterday as well, which makes
the air feel more refreshing despite values still being in the
low 60s.
The wind has been rather busy today out of mainly a
northeasterly direction. The average speed for the day so far
is around 12mph. Gusts have been frequently exceeding 20mph,
with a peak gust thus far of 29mph, which occurred just before
9:30am this morning.
Visibility has been somewhat limited today due to haziness. The
view has been generally in the 30-40 miles range all day.
The maximum temperature so far today is 75F degrees, which is
6 degrees below the normal high of 81F. The minimum temperature
since midnight is 65F degrees, which is 2 degrees above the
normal low of 63F.
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Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus distant NW-NE-ENE,
few altocumulus castellanus all quadrants
Temperature: 69F; Dew Point: 62F; Relative Humidity: 76%
Wind: NE @ 9G15 kts
Sea-level pressure: 1021.9 mb; 30.18 in. Hg: rising, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 69F
6-hr Min temp: 65F
24-hr Precip: 0.68 inches
BHO SA 1155 CLR 30 219/69/62/0409G15/018/ FEW SC DSNT NW-NE-ENE
FEW ACC ALQDS HAZY/ 8/580 51025 70068 10069 20065
10 A.M.
Weather: Scattered stratocumulus
Temperature: 72F; Dew Point: 61F Relative Humidity: 67%
Wind: ENE @ 16G21 kts
Sea-level pressure: 1023.2 mb; 30.22 in. Hg: rising, then more slowly
Visibility: 35 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 30 SCT 35 232/72/61/0616G21/022/ HAZY/ 8/500 51013
1 P.M.
Weather: Clear, few cumulus distant WSW-NW, few altocumulus NNE-E
and SW-WNW
Temperature: 74F Dew Point: 60F; Relative Humidity: 62%
Wind: ENE @ 9G16 kts
Sea-level pressure: 1023.3 mb; 30.22 in. Hg: steady, then rising
Visibility: 40 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 69F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 40 233/74/60/0609G16/022/ FEW CU DSNT WSW-NW
FEW AC NNE-E AND SW-WNW HAZY/ 8/250 53001 10075 20069
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SUMMARY FOR THURSDAY, AUGUST 14, 2025
TEMPERATURE (DEGREES F)
MAX…….90 NORMAL…..81
MIN…….68 NORMAL…..63
MEAN……79 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+7
TOTAL DEPARTURE FOR THE MONTH……………………….+3 [ 0.0 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……………..0 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON…………….1 DEPARTURE……..-9
TOTAL HEATING UNITS LAST SEASON TO DATE………..2 DEPARTURE……..-1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY…………….14 DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE MONTH……………110 DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE SEASON…………..621 DEPARTURE……+128
TOTAL COOLING UNITS LAST SEASON TO DATE………620 DEPARTURE……..+1
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)………..35 NE @ 06:01 P.M.
VECTOR #1 (1-Sec)……….34 NE @ 06:00 P.M.
VECTOR #2 (1-Sec)……….37 NNE @ 06:00 P.M.
DAVIS #1……………….33 NE @ 06:01 P.M.
DAVIS #2 ………………31 ENE @ 06:16 P.M.
RMY #1 (Instantaneous)…..36 NE @ 06:00 P.M.
RMY #2 (Instantaneous)…..42 NNE @ 06:00 P.M.
MERLIN…………………32 NE
RICHARDS (C5C) (Inst)……32 @ 06:03 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 NE @ 06:03 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 06:02 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24 @ 06:04 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………24 E @ 06:16 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 E @ 06:16 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 E @ 06:16 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 NNE @ 06:04 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………22 @ 06:16 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.3 SW [152 total miles]
VECTOR #1……………….7.1
VECTOR #2……………….7.2
DAVIS #1………………..6.7 SSW
DAVIS #2………………..6.8 SSW
RMY #1………………….6.9 SW
RMY #2………………….7.2 SW
RICHARDS (C5C)…………..7.2
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.68 DEPARTURE…..+0.55
TOTAL PRECIPITATION FOR THE MONTH…………..1.12 DEPARTURE…..-0.71
TOTAL PRECIPITATION FOR THE YEAR (2025)…….30.57 DEPARTURE…..-1.96
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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/…/.. 35 NE VEC1 34 NE RMY 36 TSTM
8/15 The low since midnight is 65F, the daily normal low is 63F.
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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 15
HIGH 95F IN 1928
LOW 47F IN 1964
PRECIP 1.89 INCHES IN 2011
PEAK GUST 44e MPH S IN 1941, 44 MPH N IN 2024
RECORDS FOR AUGUST 16
HIGH 95F IN 1944
LOW 50F IN 1927
PRECIP 1.31 INCHES IN 1951
PEAK GUST 45e MPH N IN 1951
TODAY’S REPORT PREPARED BY: MFD
