Tuesday, June 24, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JUNE 24, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0408E
SUNSET: 1925E
DAY 3 OF THE HEAT-WAVE MAKES IT OUR FIRST OFFICIAL ONE OF 2025;
TODAY’S RECORD MAXIMUM TEMPERATURE SHATTERED….
Sunshine is unrelenting today as the heat ridge is cresting over
the region creating a very warm and dry air mass aloft. Even with
temperatures reaching the upper 90s, what small cumulus that do
happen to form, dissipate just about as quickly as they develop.
This is due to the very warm air (relative to normal) aloft as
well, keeping the atmosphere capped.
Temperatures quickly warmed well into the 90s by late this morning
after starting the day in the mid to upper 70s. The record high for
today’s date was already beaten just after 9am this morning, and
shattered before noon. The previous record for day was 91F, which
was set back in 1914, 1976, and 2013. So far the temperature has
reached 99F degrees, which also ties the highest temperature ever
recorded in June. The previous occurrence occurred on June 4, 1919!
Adding to the misery are dew point values which have thankfully
dropped from the mid 70s early this morning to around 70 by
early this afternoon. Regardless, the combination of these values
with the high temperatures are yielding heat index values of
around 105F. Definitely use extreme caution if doing any physical
activity outdoors today. Once again, an Excessive Heat Warning is
in effect until 8pm this evening.
A westerly wind has been averaging at around 10mph for the day so
far, however it’s not offering any kind of relief. The peak gust so
far for the day is 22mph, which occurred just after 12pm this
afternoon.
The visibility is somewhat limited again today by haze. The view
has been between 25-40 miles all day.
The maximum temperature for today is 99F degrees, which is 21
degrees above the normal high of 78F. The minimum temperature since
midnight is 76F degrees, which is 16 degrees above the normal low
of 60F.
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Today’s Observations:
7 A.M.
Weather: Thin scattered cirrus
Temperature: 83F; Dew Point: 75F; Relative Humidity: 76%
Wind: WNW @ 9 kts
Sea-level pressure: 1018.0 mb; 30.06 in. Hg: rising, then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 83F
6-hr Min temp: 76F
24-hr Precip: 0.00 inches
BHO SA 1155 250 -SCT 25 180/83/75/2909/006/ HAZY/ 8/001 51006 10083
20076
10 A.M.
Weather: Clear , few cirrus all quadrants
Temperature: 93F; Dew Point: 73F; Relative Humidity: 53%; Heat Index: 102F
Wind: WNW @ 5kts, wind light
Sea-level pressure: 1018.2 mb; 30.07 in. Hg: rising, then falling
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 30 182/93/73/3005/007/ FEW CI ALQDS HAZY WND LGT
HX 102/ 8/001 50002
1 P.M.
Weather: Clear, few small cumulus distant WSW-NNW, few cirrus distant
NNE-SE-SW
Temperature: 98F Dew Point: 70F; Relative Humidity: 41%; Heat Index: 105F
Wind: W @ 9G17 kts
Sea-level pressure: 1016.8 mb; 30.03 in. Hg: falling, the more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 99F
6-hr Min temp: 83F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 40 168/98/70/2809G17/003/ FEW SML CU DSNT WSW-NNW
FEW CI DSNT NNE-SE-SW HAZY HX 105/ 8/101 58014 10099 20083
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SUMMARY FOR MONDAY, JUNE 23, 2025
TEMPERATURE (DEGREES F); R = DAILY RECORD
MAX…….94R NORMAL…..78
MIN…….71 NORMAL…..60
MEAN……83 NORMAL…..69
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+14
TOTAL DEPARTURE FOR THE MONTH………………………+54 [+2.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….50 DEPARTURE…….-12
TOTAL HEATING UNITS FOR THE SEASON………….5665 DEPARTURE……-541
TOTAL HEATING UNITS LAST SEASON TO DATE……..5391 DEPARTURE……+274
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY…………….18 DEPARTURE…….+13
TOTAL COOLING UNITS FOR THE MONTH……………112 DEPARTURE…….+41
TOTAL COOLING UNITS FOR THE SEASON…………..129 DEPARTURE…….+30
TOTAL COOLING UNITS LAST SEASON TO DATE………135 DEPARTURE……..-6
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)……….E22 SSW @ 05:12 P.M.
VECTOR #1 (1-Sec)……….22 SSW @ 05:12 P.M.
VECTOR #2 (1-Sec)……….23 S @ 05:12 P.M.
DAVIS #1……………….25 S @ 05:12 P.M.
DAVIS #2 ………………24 S @ 04:53 P.M.
RMY #1 (Instantaneous)…..22 SSW @ 05:12 P.M.
RMY #2 (Instantaneous)…..24 S @ 05:12 P.M.
MERLIN…………………21 S
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 SSW @ 05:40 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 @ 05:01 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 @ 05:36 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 S @ 05:00 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 S @ 04:55 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 SSW @ 05:08 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 SSW @ 05:36 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.0 NW [191 total miles]
VECTOR #1……………….8.6
VECTOR #2……………….8.9
DAVIS #1………………..8.2 SW
DAVIS #2………………..8.7 WSW
RMY #1………………….8.4 W
RMY #2………………….9.0 WSW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..1.43 DEPARTURE…..-2.25
TOTAL PRECIPITATION FOR THE YEAR (2025)…….23.17 DEPARTURE…..-3.11
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PRELIMINARY CLIMATE SUMMARY FOR JUNE 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
6/1 63/47/55/-7/0.01/588/65 40 W VEC1 40 W RMY 42
6/2 70/48/59/-3/T/780/86 25 WNW VEC1 25 WSW RMY 26
6/3 79/50/65/+3/0.00/853/94 23 SSW VEC1 23 SSW RMY 21
6/4 84/58/71/+8/0.00/708/78 26 SW VEC1 27 SW RMY 28
6/5 93/61/77/+14/0.00/819/90 18 WSW VEC1 18 SW RMY 19
6/6 81/63/72/+9/0.00/382/42 26 ENE VEC1 27 NE RMY 27
6/7 71/60/66/+2/0.95/000/00 26 NE VEC1 26 NE RMY 25 TSTM
6/8 67/55/61/-3/0.00/347/38 22 ENE VEC1 21 ENE RMY 22
6/9 61/55/58/-6/0.01/000/00 20 E VEC1 21 E RMY 20
6/10 62/54/58/-7/0.20/000/00 21 W VEC1 20 W RMY 20
6/11 81/58/70/+5/0.00/850/93 32 WSW VEC1 32 WSW RMY 33
6/12 85/64/75/+10/0.00/814/89 47 WNW VEC1 47 WNW RMY 49
6/13 76/57/67/+1/T/631/69 20 E VEC1 20 E RMY 20
6/14 58/54/56/-10/0.09/000/00 24 NE VEC1 24 NE RMY 24
6/15 67/53/60/-6/0.00/449/49 18 E VEC1 18 E RMY 17
6/16 73/52/63/-4/0.00/641/70 20 SE VEC1 20 ESE RMY 20
6/17 74/57/66/-1/0.12/028/03 22 S VEC1 22 S RMY 23
6/18 75/63/69/+2/0.02/018/02 22 SSW VEC1 23 SSW RMY 23
6/19 90/66/78/+10/0.00/…/.. 31 SSW VEC1 31 SSW RMY 31
6/20 81/66/74/+6/0.00/…/.. 52 WNW VEC1 52 WNW RMY 54
6/21 86/61/74/+6/0.00/…/.. 22 NW VEC1 22 NW RMY 21
6/22 91/68/80/+11/0.03/…/.. 32 W VEC1 32 W RMY 32
6/23 94/71/83/+14/0.00/…/.. 22 SSW VEC1 22 SSW RMY 22
6/24 The low since midnight is 76F, the daily normal low is 60F.
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JUNE DAILY RECORDS TO DATE
6/23 RECORD HIGH MAXIMUM TEMPERATURE OF 94F,
BEATING THE PREVIOUS RECORD OF 93F SET IN 1888
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 24
HIGH 91F IN 1914, 1976, 2013
LOW 40F IN 1932
PRECIP 2.80 INS IN 1929
PEAK GUST 54 MPH WNW IN 2010
RECORDS FOR JUNE 25
HIGH 93F IN 1943, 1980, 2005
LOW 47F IN 1903
PRECIP 1.38 INS IN 2012
PEAK GUST 51 MPH W IN 1960
TODAY’S REPORT PREPARED BY: MFD
