Thursday, July 10, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, JULY 10, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0417E
SUNSET: 1922E
RECORD RAINFALL THIS MORNING, SLOWLY TAPING OFF EARLY THIS
AFTERNOON….
Very light rain showers began last evening just after 10pm, but
the main show started around 2:30am this morning with a
thunderstorm opening the heavens. Torrential rain continued for
the next few hours, finally shedding some intensity just after
8am. 3.23″ of rain fell between 2:30am and 7am, with over 1″
falling for each of the hours of 5-6am and 6-7am! An additional
0.60″ has fallen between 7am and 1pm, giving us a daily total
so far of 3.83″! This obliterates the record rainfall for today’s
date of 1.95″, which was set back in 2015. We’ll have a record
report with the final daily total tomorrow morning.
Showers have finally tapered off early this afternoon, at least
for now. However we remain in the clouds. As such temperatures
are being held down quite a bit today.
The temperature has held in the mid 60s all day to this point.
This is 15-20 degrees below the normal daytime readings for this
time of year, and is a wonderful reprieve from the heat we
experienced earlier in the week.
The wind was quite light for the first few hours of the day,
even going calm for the entire hour 1-2am this morning. However
it kicked into a new gear after the thunderstorm rolled through
early this morning. The wind has stayed fairly active since,
mainly out of the east-northeast to northeast. The average
speed for the day so far is around 8mph. The peak gust for the
day so far is 24mph, which occurred just before 5am.
Visibility has been limited all day since we’ve mostly been in
the clouds. It did reach as much as 1 mile for a time early this
morning, however it’s generally been 1/2 or less for the most
part.
The maximum temperature so far today is 66F degrees, which is
16 degrees below the normal high of 82F. The minimum temperature
since midnight is 63F degrees, which is 1 degree below the normal
low of 64F.
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Today’s Observations:
7 A.M.
Weather: Overcast stratus, moderate rain showers
Temperature: 65F; Dew Point: 65F; Relative Humidity: 100%
Wind: ENE @ 8 kts
Sea-level pressure: 1016.4 mb; 30.01 in. Hg: falling, then rising
Visibility: 1 mile, fog
6-hr Max temp: 66F
6-hr Min temp: 64F
24-hr Precip: 3.23 inches
BHO SA 1155 E3 OVC 1RWF 164/65/65/0608/001/ 8/6// 55001 6323/
70323 10066 20064
10 A.M.
Weather: Sky obscured, vertical visibility 200ft, light rain showers
Temperature: 64F; Dew Point: 64F; Relative Humidity: 100%
Wind: NE @ 11G18 kts
Sea-level pressure: 1016.9 mb; 30.03 in. Hg: rising, then falling
Visibility: 1/8 mile, fog
3-hr Precip: 0.52 inches
BHO SA 1455 X W2 1/8RW-F 169/64/64/0411G18/003/ 8//// 50005 6052/
1 P.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 64F Dew Point: 64F; Relative Humidity: 100%
Wind: NE @ 7G14 kts
Sea-level pressure: 1016.4 mb; 30.01 in. Hg: rising, then falling
Visibility: 1/8 mile, fog
6-hr Max temp: 66F
6-hr Min temp: 63F
6-hr Precip: 0.60 inches
BHO SA 1755 X W2 1/8F 164/64/64/0507G14/001/ RW-E21/ 8//// 58005
6060/ 10066 20063
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SUMMARY FOR WEDNESDAY, JULY 9, 2025
TEMPERATURE (DEGREES F)
MAX…….74 NORMAL…..81
MIN…….65 NORMAL…..64
MEAN……70 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-3
TOTAL DEPARTURE FOR THE MONTH………………………+36 [+3.8 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……..-3
TOTAL HEATING UNITS FOR THE SEASON…………….0 DEPARTURE……..-3
TOTAL HEATING UNITS LAST SEASON TO DATE………..0 DEPARTURE………0
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..5 DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH…………….98 DEPARTURE…….+33
TOTAL COOLING UNITS FOR THE SEASON…………..298 DEPARTURE…….+94
TOTAL COOLING UNITS LAST SEASON TO DATE………271 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)……….E26 SW @ 12:07 A.M.
VECTOR #1 (1-Sec)……….27 SW @ 12:07 A.M.
VECTOR #2 (1-Sec)……….27 SW @ 12:00 A.M.
DAVIS #1……………….24 WSW @ 12:01 A.M.
DAVIS #2 ………………25 WSW @ 12:00 A.M.
RMY #1 (Instantaneous)…..28 SW @ 12:07 A.M.
RMY #2 (Instantaneous)…..27 SW @ 12:01 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 SW @ 12:10 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 @ 12:09 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 @ 12:01 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 SW @ 12:01 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 SW @ 12:09 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 SW @ 12:09 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 SW @ 12:09 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………5.7 ENE [136 total miles]
VECTOR #1……………….6.1
VECTOR #2……………….6.5
DAVIS #1………………..6.2 E
DAVIS #2………………..6.2 E
RMY #1………………….6.2 ENE
RMY #2………………….6.5 ENE
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..3.23 DEPARTURE…..+3.12
TOTAL PRECIPITATION FOR THE MONTH…………..4.42 DEPARTURE…..+3.44
TOTAL PRECIPITATION FOR THE YEAR (2025)…….27.65 DEPARTURE…..-0.56
————————————————————–
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 The low since midnight is 63F, the daily normal low is 64F.
————————————————————–
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 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.95 INS IN 2015
WIND 75 MPH W IN 1985
RECORDS FOR JULY 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988
TODAY’S REPORT PREPARED BY: MFD
