Tuesday, August 12, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, AUGUST 12, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0449E
SUNSET: 1849E
HOT AND HAZY SUNSHINE DOMINATING ONCE AGAIN TODAY….
Sunshine is once again ruling the kingdom as an upper level
ridge remains parked over the region. As has been the case
the last couple of days, high thin cirrus clouds have been
floating by, but are doing nothing to help filter the sun
at all. As mentioned yesterday. we’re stuck in the summer
equivalent of Groundhog’s day with the same weather every day!
Today is day 2 of what now looks to be a 3 day heatwave this
week.
Temperatures have reached the low 90s early this afternoon.
Dew point values have actually decreased a bit from the mid
60s during the morning hours to around 60 by early this
afternoon. This reprieve from the higher humidity is welcomed
considering the air temperature is on the hot side.
The wind has been a little bit more “active” today compared to
yesterday. While the speeds have generally been under 15mph,
they have for the most part been pretty steady. The average
speed for the day so far is around 10mph. The peak gust so far
for the day has reached 20mph, which occurred in the wee hours
of the day just before 12:30am.
Visibility has only been limited to around 20-25 miles today
thanks to hazy conditions.
The maximum temperature so far today is 92F degrees, which is
11 degrees above the normal high of 81F. The minimum temperature
since midnight is 68F degrees, which is 5 degrees above the
normal low of 63F.
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Today’s Observations:
7 A.M.
Weather: Thin broken cirrus
Temperature: 74F; Dew Point: 64F; Relative Humidity: 70%
Wind: WNW @ 7 kts
Sea-level pressure: 1020.1 mb; 30.12 in. Hg: rising steadily
Visibility: 20 miles, hazy
6-hr Max temp: 74F
6-hr Min temp: 68F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 -BKN 20 201/74/64/3007/012/ HAZY/ 8/001 52006
10074 20068
10 A.M.
Weather: Thin scattered cirrus
Temperature: 87F; Dew Point: 64F Relative Humidity: 45%
Wind: WSW @ 5 kts, wind light
Sea-level pressure: 1019.2 mb; 30.10 in. Hg: steady, then falling
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 250 -SCT 25 192/87/64/2405/010/ HAZY WND LGT/ 8/001 58009
1 P.M.
Weather: Thin scattered cirrus
Temperature: 91F Dew Point: 60F; Relative Humidity: 35%
Wind: SW @ 5 kts, wind light
Sea-level pressure: 1017.5mb; 30.05 in. Hg: falling, then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 92F
6-hr Min temp: 74F
6-hr Precip: 0.00 inches
BHO SA 1755 E250 -BKN 25 175/91/60/2205/005/ HAZY WND LGT/ 8/001
56017 10092 20074
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SUMMARY FOR MONDAY, AUGUST 11, 2025
TEMPERATURE (DEGREES F)
MAX…….94 NORMAL…..81
MIN…….67 NORMAL…..63
MEAN……81 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+9
TOTAL DEPARTURE FOR THE MONTH………………………-18 [-1.8 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…………….16 DEPARTURE……..+9
TOTAL COOLING UNITS FOR THE MONTH…………….68 DEPARTURE…….-17
TOTAL COOLING UNITS FOR THE SEASON…………..579 DEPARTURE……+107
TOTAL COOLING UNITS LAST SEASON TO DATE………606 DEPARTURE…….-27
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)………..20 W @ 11:56 P.M.
VECTOR #1 (1-Sec)……….19 W @ 11:55 P.M.
VECTOR #2 (1-Sec)……….20 W @ 11:59 P.M.
DAVIS #1……………….19 W @ 11:55 P.M.
DAVIS #2 ………………18 W @ 11:47 P.M.
RMY #1 (Instantaneous)…..19 W @ 11:55 P.M.
RMY #2 (Instantaneous)…..20 W @ 11:48 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……18 @ 11:54 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 W @ 11:54 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 11:59 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 11:59 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 W @ 11:59 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 W @ 11:59 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 W @ 11:59 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 W @ 11:59 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 @ 11:59 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.6 WSW [158 total miles]
VECTOR #1……………….7.3
VECTOR #2……………….7.4
DAVIS #1………………..7.1 WSW
DAVIS #2………………..7.0 WSW
RMY #1………………….7.0 WSW
RMY #2………………….7.4 WSW
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…..-1.01
TOTAL PRECIPITATION FOR THE YEAR (2025)…….29.89 DEPARTURE…..-2.26
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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/…/.. 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 94/67/81/+9/0.00/…/.. 20 W VEC1 19 W RMY 19
8/12 The low since midnight is 68F, 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 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983
RECORDS FOR AUGUST 13
HIGH 98F IN 1944, 2002
LOW 47F IN 1902, 1957
PRECIP 2.92 INCHES IN 1989
PEAK GUST 52 MPH SSE IN 1963
TODAY’S REPORT PREPARED BY: MFD
