Tuesday, July 15, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JULY 15, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0421E
SUNSET: 1919E
EARLY FOG BURNS OFF TO MAINLY SUNNY SKIES WITH HOT AND HUMID
CONDITIONS….
We started the day once again with low clouds and fog following
some light rain showers that moved through overnight. The showers
only left 0.06″ of rain, but it’s adding to what has turned into
a very wet month.
The clouds and fog burned off quickly leaving us with mainly
sunny skies through the balance of the day so far. Hot and humid
conditions are impacting the area with heat index values pushing
into the mid 90s. A heat advisory is in effect for the high heat
index values of 96F or higher.
Temperatures have warmed to near 90 early this afternoon with dew
point values hanging in the low to mid 70s. As such, it’s rather
oppressive out there again today, combining with the heat.
To make matters worse, the wind has been on the light side since
early this morning. A mostly west-southwest to southwest wind has
been averaging at around 8mph for the day so far. The peak gust
for the day so far is 20mph, which occurred right before 3am this
morning.
The fog lifted very early this morning, so we’ve observed 30-40
miles of visibility for all of our observations today. Conditions
are hazy as one would expect with such high humidity levels.
The maximum temperature so far today is 89F degrees, which is
7 degrees above the normal high of 82F. The minimum temperature
since midnight is 71F degrees, which is 7 degrees above the normal
low of 64F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Broken stratus fractus, overcast altocumulus
Temperature: 73F; Dew Point: 72F; Relative Humidity: 98%
Wind: SW @ 6 kts, wind light
Sea-level pressure: 1019.4 mb; 30.10 in. Hg: rising steadily
Visibility: 30 miles, 8 miles E, 15 miles SSE-SSW, thin fog
6-hr Max temp: 73F
6-hr Min temp: 71F
24-hr Precip: 0.06 inches
BHO SA 1155 E1 BKN 75 OVC 30 194/73/72/2306/010/ STFRA DRFTG OVR SMT
THN F ALQDS VSBY 8 E 15 SSE-SSW WND LGT/ 8/65/ 52006 6006/ 70006
10073 20071
10 A.M.
Weather: Scattered cumulus, scattered altocumulus, scattered dense
cirrus
Temperature: 82F; Dew Point: 72F; Relative Humidity: 72%
Wind: WSW @ 4 kts, wind light
Sea-level pressure: 1019.0 mb; 30.09 in. Hg: steady, then falling
Visibility: 35 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 22 SCT 85 SCT 250 SCT 35 190/82/72/2504/009/ HAZY
WND LGT/ 8/252 58004
1 P.M.
Weather: Broken cumulus, broken cirrus
Temperature: 88F Dew Point: 72F; Relative Humidity: 59%
Wind: W @ 3 kts, wind light
Sea-level pressure: 1017.7 mb; 30.05 in. Hg: falling, then more slowly
Visibility: 35 miles, hazy
6-hr Max temp: 89F
6-hr Min temp: 73F
6-hr Precip: 0.00 inches
BHO SA 1755 E42 BKN 250 BKN 35 177/88/72/2703/005/ HAZY WND LGT/
8/202 56013 10089 20073
————————————————————–
SUMMARY FOR MONDAY, JULY 14, 2025
TEMPERATURE (DEGREES F)
MAX…….81 NORMAL…..82
MIN…….65 NORMAL…..64
MEAN……73 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………..0
TOTAL DEPARTURE FOR THE MONTH………………………+28 [+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……………..1 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON…………….1 DEPARTURE……..-3
TOTAL HEATING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..8 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………131 DEPARTURE…….+26
TOTAL COOLING UNITS FOR THE SEASON…………..331 DEPARTURE…….+87
TOTAL COOLING UNITS LAST SEASON TO DATE………337 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)……….E23 SW @ 04:32 P.M.
VECTOR #1 (1-Sec)……….23 SW @ 04:32 P.M.
VECTOR #2 (1-Sec)……….25 SW @ 04:38 P.M.
DAVIS #1……………….22 S @ 04:19 P.M.
DAVIS #2 ………………24 S @ 04:16 P.M.
RMY #1 (Instantaneous)…..25 SSW @ 05:20 P.M.
RMY #2 (Instantaneous)…..25 SW @ 04:38 P.M.
MERLIN…………………22 SW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 SSW @ 04:37 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 04:33 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 04:33 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 S @ 04:40 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 SSW @ 04:33 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 SSW @ 04:33 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 SW @ 04:33 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.2 SSW [221 total miles]
VECTOR #1……………….9.6
VECTOR #2………………10.1
DAVIS #1………………..9.1 SSW
DAVIS #2……………….10.0 SSW
RMY #1………………….9.4 SSW
RMY #2…………………10.2 SSW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.06 DEPARTURE…..-0.05
TOTAL PRECIPITATION FOR THE MONTH…………..5.20 DEPARTURE…..+3.64
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.43 DEPARTURE…..-0.36
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
7/1 90/68/79/+8/0.14/411/45 38 W VEC1 38 W RMY 41 TSTM
7/2 85/69/77/+6/0.02/247/27 23 WSW VEC1 24 WSW RMY 24
7/3 88/63/76/+4/0.03/748/82 39 SW VEC1 39 SW RMY 40 TSTM
7/4 80/60/70/-2/0.00/875/96 28 NNW VEC1 27 NNW RMY 29
7/5 83/61/72/0/0.00/664/73 23 W VEC1 23 W RMY 24
7/6 92/65/79/+7/0.00/818/90 29 SW VEC1 29 SW RMY 29
7/7 88/69/79/+7/0.01/490/54 28 SSW VEC1 28 SSW RMY 29 TSTM
7/8 94/67/81/+9/0.36/562/62 24 WSW VEC1 24 WSW RMY 27 TSTM
7/9 74/65/70/-3/0.73/172/19 26 SW VEC1 27 SW RMY 28 TSTM
7/10 66/61/64/-9/3.85/…/.. 24 ENE VEC1 24 ENE RMY 24 TSTM
7/11 80/62/71/-2/0.00/…/.. 18 SSW VEC1 18 SSW RMY 18
7/12 84/65/75/+2/0.00/…/.. 20 S VEC1 20 S RMY 19
7/13 85/63/74/+1/0.00/…/.. 21 SSW VEC1 21 SSW RMY 21
7/14 81/65/73/0/T/…/.. 23 SW VEC1 23 SW RMY 25
7/15 The low since midnight is 71F, the daily normal low is 64F.
————————————————————–
JULY DAILY RECORDS TO DATE
7/10 RECORD HIGHEST PRECIPITATION OF 3.85 INCHES;
BEATING OLD RECORD OF 1.95 INCHES SET IN 2015
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002
RECORDS FOR JULY 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1903
PRECIP 2.56 INS IN 2023
WIND 48e MPH SW 1944
TODAY’S REPORT PREPARED BY: MFD
