Monday, August 11, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, AUGUST 11, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0446E
SUNSET: 1852E
HAZY, HOT, AND HUMID WEATHER RETURNS UNDER UNRELENTING SUNSHINE….
Despite some passing cumulus and high thin cirrus clouds,
today is once again featuring an abundance of sunshine. It’s
starting to feel like the summer equivalent of Groundhog’s day
with the same weather everyday! Today is likely day 1 of a 3
or 4 day heatwave this week as the next 2 days at least are
expected to reach the mid 90s.
Temperatures have reached the low to mid 90s early this
afternoon. Dew point values have generally been in the mid 60s
today, thus creating heat index values into the mid, and for a
time, into the upper 90s.
Adding to the discomfort of the day, the wind has yet again
been on the light side out of a mainly westerly direction. The
average speed for the day so far is around 7mph. The peak gust
so far for the day is just 15mph, which occurred just before
3:40am this morning.
Visibility has only been around 25-30 miles throughout the day
thanks to the hazy conditions.
The maximum temperature so far today is 93F degrees, which is
12 degrees above the normal high of 81F. The minimum temperature
since midnight is 67F degrees, which is 4 degrees above the
normal low of 63F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Thin scattered cirrus
Temperature: 75F; Dew Point: 64F; Relative Humidity: 68%
Wind: NW @ 4 kts, wind light
Sea-level pressure: 1023.4 mb; 30.22 in. Hg: rising, then more rapidly
Visibility: 25 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 67F
24-hr Precip: 0.00 inches
BHO SA 1155 250 -SCT 25 234/75/64/3104/022/ HAZY WND LGT/ 8/001
53007 10075 20067
10 A.M.
Weather: Thin scattered cirrus
Temperature: 87F; Dew Point: 67F Relative Humidity: 51%
Wind: W @ 5 kts, wind light and variable
Sea-level pressure: 1023.4 mb; 30.22 in. Hg: rising, then falling
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 250 -SCT 25 234/87/67/2605/022/ HAZY WND L/V/ 8/001 50000
1 P.M.
Weather: Scattered cumulus, thin scattered cirrus
Temperature: 91F Dew Point: 65F; Relative Humidity: 43%
Wind: WSW @ 6 kts, wind light
Sea-level pressure: 1021.9 mb; 30.18 in. Hg: falling, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 93F
6-hr Min temp: 75F
6-hr Precip: 0.00 inches
BHO SA 1755 40 SCT 250 -SCT 30 219/91/65/2506/018/ HAZY WND LGT/
8/201 56015 10093 20075
————————————————————–
SUMMARY FOR SUNDAY, AUGUST 10, 2025
TEMPERATURE (DEGREES F)
MAX…….89 NORMAL…..81
MIN…….61 NORMAL…..63
MEAN……75 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+3
TOTAL DEPARTURE FOR THE MONTH………………………-27 [-2.9 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……..-2
TOTAL HEATING UNITS FOR THE SEASON…………….1 DEPARTURE……..-8
TOTAL HEATING UNITS LAST SEASON TO DATE………..2 DEPARTURE……..-1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY…………….10 DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE MONTH…………….52 DEPARTURE…….-26
TOTAL COOLING UNITS FOR THE SEASON…………..563 DEPARTURE…….+99
TOTAL COOLING UNITS LAST SEASON TO DATE………599 DEPARTURE…….-36
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)………..22 S @ 05:57 P.M.
VECTOR #1 (1-Sec)……….22 S @ 05:50 P.M.
VECTOR #2 (1-Sec)……….21 S @ 05:52 P.M.
DAVIS #1……………….22 S @ 05:51 P.M.
DAVIS #2 ………………26 S @ 05:49 P.M.
RMY #1 (Instantaneous)…..21 S @ 05:51 P.M.
RMY #2 (Instantaneous)…..22 S @ 05:52 P.M.
MERLIN…………………19 S
RICHARDS (C5C) (Inst)……20 @ 05:51 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 S @ 05:55 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 @ 05:53 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 06:05 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 S @ 05:53 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 S @ 06:05 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 S @ 05:53 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 S @ 06:05 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 @ 05:53 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.8 SW [162 total miles]
VECTOR #1……………….7.6
VECTOR #2……………….7.7
DAVIS #1………………..7.0 SSW
DAVIS #2………………..7.3 SSW
RMY #1………………….7.3 SSW
RMY #2………………….7.7 SSW
RICHARDS (C5C)…………..7.4
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.44 DEPARTURE…..-0.88
TOTAL PRECIPITATION FOR THE YEAR (2025)…….29.89 DEPARTURE…..-2.13
————————————————————–
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/…/.. 18 ESE VEC1 18 ESE RMY 17
8/8 83/61/72/0/0.00/…/.. 21 SSW VEC1 21 SSW RMY 21
8/9 83/60/72/0/0.00/…/.. 22 S VEC1 22 SSW RMY 22
8/10 89/61/75/+3/0.00/…/.. 22 S VEC1 22 S RMY 21
8/11 The low since midnight is 67F, the daily normal low is 63F.
————————————————————–
AUGUST DAILY RECORDS TO DATE
NONE.
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR AUGUST 11
HIGH 97F IN 1944
LOW 49F IN 1972
PRECIP 3.13 INCHES IN 1990
PEAK GUST 44 MPH SW IN 1971
RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983
TODAY’S REPORT PREPARED BY: MFD
