Friday, July 11, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, JULY 11, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0418E
SUNSET: 1921E
FOGGY MORNING, MOSTLY OVERCAST CONDITIONS AND MUGGY TODAY….
As anticipated, we have shattered the record for July 10th in
total rainfall for the day. The record of 1.95 inches set in 2015
was overshadowed by +1.9 inches with a grand total of 3.85 inches
for the day. This not only beat out for the day, stands as the 3rd
highest July calendar day rainfall total on record.
According to our chief scientist Mike Iacono, here are the current
rankings:
BHO Highest July Calendar Day Rainfall, inches (1885-2025):
1) 4.46 on 1 July 1915
2) 4.01 on 27 July 1979
3) 3.85 on 10 July 2025
4) 3.74 on 9 July 1921
5) 3.54 on 13 July 1996
6) 3.32 on 28 July 1911
7) 3.14 on 13 July 1898
8) 3.02 on 9 July 2021
Thankfully, we have remained dry today, but have had mostly overcast
conditions. There has been little clearing in sky coverage, though it
has warmed considerably as the day progressed.
While the temperatures are still below normal values, the higher
dew point and lack of air has made it feel a bit uncomfortable out
there today. Temperatures have climbed to the upper 70’s and dew
points have been in the upper 60’s to 70F by 1pm.
The wind has been calm to light and variable for most of the day.
Wind directions have been out of the east-southeast for early
morning to out of the southwest this afternoon. The average speed
for the day so far is only around 3mph. The peak gust for the day
so far is around 12mph, which occurred just after 1:30pm.
Visibility was heavily limited by foggy conditions this morning
and slowly improved, with some sightings of the sun during the
late morning. We had started at about 1/8 mile of visibility in
the early morning and improved to around 30 miles by the afternoon.
The maximum temperature so far today is 79F degrees, which is
3 degrees below the normal high of 82F. The minimum temperature
since midnight is 61F degrees, which is 3 degrees below the normal
low of 64F.
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Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 200 ft
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: Calm
Sea-level pressure: 1018.2 mb; 30.01 in. Hg: rising unsteadily
Visibility: 1/8 mile, fog
6-hr Max temp: 63F
6-hr Min temp: 61F
24-hr Precip: 0.62 inches
BHO SA 1155 X W2 1/8F 182/63/63/0000/007/ WND CALM 8//// 52007
70062 10063 20061
10 A.M.
Weather: Overcast stratus, visibility 5 miles NNW-NNE, 15 miles
NE-E-S-NW
Temperature: 66F; Dew Point: 66F; Relative Humidity: 100%
Wind: SSE @ 3 kts, wind light
Sea-level pressure: 1016.9 mb; 30.03 in. Hg: falling, then rising
Visibility: 10 miles, thin fog all quadrants
3-hr Precip: 0.00 inches
BHO SA 1455 E3 OVC 10 183/66/66/1603/007/ THN F ALQDS VSBY 5 NNW-NNE
15 NE-E-S-NW WND LGT/ 8/6// 53001
1 P.M.
Weather: Overcast stratocumulus, few breaks in overcast NNW-N
Temperature: 78F Dew Point: 70F; Relative Humidity: 75%
Wind: SW @ 9 kts
Sea-level pressure: 1018.0 mb; 30.06 in. Hg: falling, then steady
Visibility: 30 miles
6-hr Max temp: 79F
6-hr Min temp: 63F
6-hr Precip: 0.00 inches
BHO SA 1755 E4 OVC 30 180/78/70/2209/006/ FEW BINOVC NNW-N/ 8/5//
56003 10079 20063
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SUMMARY FOR THURSDAY, JULY 10, 2025
TEMPERATURE (DEGREES F)
MAX…….65 NORMAL…..82
MIN…….61 NORMAL…..64
MEAN……63 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………-10
TOTAL DEPARTURE FOR THE MONTH………………………+26 [+2.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..2 DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH……………..2 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE SEASON…………….0 DEPARTURE……..-1
TOTAL HEATING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+2
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-8
TOTAL COOLING UNITS FOR THE MONTH…………….98 DEPARTURE…….+25
TOTAL COOLING UNITS FOR THE SEASON…………..298 DEPARTURE…….+86
TOTAL COOLING UNITS LAST SEASON TO DATE………286 DEPARTURE…….+12
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 ENE @ 04:49 A.M.
VECTOR #1 (1-Sec)……….24 ENE @ 04:49 A.M.
VECTOR #2 (1-Sec)……….23 NE @ 09:54 A.M.
DAVIS #1……………….22 NE @ 04:49 A.M.
DAVIS #2 ………………23 E @ 10:03 A.M.
RMY #1 (Instantaneous)…..24 NE @ 10:03 A.M.
RMY #2 (Instantaneous)…..23 NE @ 10:02 A.M.
MERLIN…………………20 NE
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 ENE @ 04:50 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 04:50 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 05:22 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 ENE @ 04:50 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 ENE @ 04:50 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 ENE @ 04:50 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 NE @ 05:22 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.2 NE [172 total miles]
VECTOR #1……………….7.5
VECTOR #2……………….7.8
DAVIS #1………………..7.4 ENE
DAVIS #2………………..7.2 ENE
RMY #1………………….7.3 NE
RMY #2………………….7.7 NE
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.62 DEPARTURE…..+0.50
TOTAL PRECIPITATION FOR THE MONTH…………..5.14 DEPARTURE…..+4.04
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.37 DEPARTURE…..+0.04
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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 65/61/63/-10/3.85/…/.. 24 ENE VEC1 24 ENE RMY 24 TSTM
7/11 The low since midnight is 61F, the daily normal low is 64F.
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JULY 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 JULY 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988
RECORDS FOR JULY 12
HIGH 96F IN 1908
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944
TODAY’S REPORT PREPARED BY: Amanda Joly
