Wednesday, July 16, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, JULY 16, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0422E
SUNSET: 1918E
EARLY FOG BURNS OFF TO MAINLY SUNNY SKIES WITH HOT AND HUMID
CONDITIONS ONCE AGAIN….
We started the day once again with low clouds and fog. These once
again burned off fairly quickly leaving us with mainly sunny skies
for the balance of the day to this point. Cumulus clouds have
developed with the hot and humid air mass in place.
Temperatures have warmed into the low 90s early this afternoon
with dew point values hanging in the mid 70s. As such, it’s rather
oppressive out there again today with heat index values approaching
100F.
Winds have been fairly steady out of the southwest, averaging at
around 7mph. The peak gust so far is 18mph, which occurred just
after noon-time.
Visibility was limited early this morning due to fog, but improved
a bit to around 30-35 miles with hazy conditions.
The maximum temperature so far today is 92F degrees, which is
10 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
Temperature: 74F; Dew Point: 73F; Relative Humidity: 97%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1018.5 mb; 30.08 in. Hg: steady, then rising
Visibility: 4 miles, 1 mile ENE-S-SW, 10 miles N-NE, fog
6-hr Max temp: 74F
6-hr Min temp: 71F
24-hr Precip: 0.00 inches
BHO SA 1155 E1 BKN 4F 185/74/73/2005/008/ STFRA DRFTG OVR SMT
VSBY 1 ENE-S-SW 10 N-NE/ 8/600 53003 10074 20071
10 A.M.
Weather: Clear, few cumulus all quadrants
Temperature: 86F; Dew Point: 74F; Relative Humidity: 67%
Wind: SW @ 4 kts, wind light and variable
Sea-level pressure: 1017.5 mb; 30.05 in. Hg: falling, then more rapidly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 25 175/86/74/2204/005/ FEW CU ALQDS HAZY WND L/V/
8/200 58010
1 P.M.
Weather: Broken cumulus
Temperature: 91F Dew Point: 73F; Relative Humidity: 56%
Wind: SSW @ 7 kts
Sea-level pressure: 1016.7 mb; 30.02 in. Hg: falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 92F
6-hr Min temp: 74F
6-hr Precip: 0.00 inches
BHO SA 1755 E45 BKN 35 167/91/73/2007/002/ HAZY HX 100/ 8/200 58008
10092 20074
————————————————————–
SUMMARY FOR TUESDAY, JULY 15, 2025
TEMPERATURE (DEGREES F)
MAX…….90 NORMAL…..82
MIN…….71 NORMAL…..64
MEAN……81 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+8
TOTAL DEPARTURE FOR THE MONTH………………………+36 [+2.2 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…………….16 DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE MONTH……………147 DEPARTURE…….+34
TOTAL COOLING UNITS FOR THE SEASON…………..347 DEPARTURE…….+95
TOTAL COOLING UNITS LAST SEASON TO DATE………353 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)……….E24 SSW @ 05:09 P.M.
VECTOR #1 (1-Sec)……….24 SSW @ 05:09 P.M.
VECTOR #2 (1-Sec)……….24 SSW @ 05:07 P.M.
DAVIS #1……………….24 S @ 04:15 P.M.
DAVIS #2 ………………29 S @ 04:14 P.M.
RMY #1 (Instantaneous)…..24 SSW @ 05:09 P.M.
RMY #2 (Instantaneous)…..24 SSW @ 04:50 P.M.
MERLIN…………………22 S
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 SSW @ 04:18 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 05:10 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 05:09 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 S @ 05:10 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 S @ 04:16 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 SSW @ 05:35 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 SW @ 05:09 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.4 SW [201 total miles]
VECTOR #1……………….8.9
VECTOR #2……………….9.2
DAVIS #1………………..8.4 SSW
DAVIS #2………………..9.1 SW
RMY #1………………….8.7 SW
RMY #2………………….9.3 SW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..5.20 DEPARTURE…..+3.52
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.43 DEPARTURE…..-0.48
————————————————————–
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 90/71/81/+8/0.06/…/.. 24 SSW VEC1 24 SSW RMY 24
7/16 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 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1903
PRECIP 2.56 INS IN 2023
WIND 48e MPH SW 1944
RECORDS FOR JULY 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971
TODAY’S REPORT PREPARED BY: MFD
