Saturday, July 5, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JULY 5, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0414E
SUNSET: 1924E
DRY AIR WITH LOW HUMIDITY CONTINUES ON BLUE HILL TODAY….
Another beautiful day at Blue Hill with continued dry air and
seasonable temperatures. We have had mostly high level cloud
cover today with a few cumulus clouds popping up during the
early afternoon. Increasing clouds were observed by mid morning,
however, because the clouds were high level cirrus, there was
still plenty of sunshine throughout the day.
Temperatures have been similar to yesterday, with an overnight
low of 61F. We started the morning in the upper 60’s and just made
reached 82F by the final daily observation. Dew points have also
stayed in the mid 50s, which is slightly higher than yesterday,
and with lighter winds it has felt just a tad bit humid. Overall,
it’s been a very comfortable day though.
The wind has been light for much of the day. During the overnight
we had a northwesterly flow that has shifted to the southwest by
the late morning. The average speed for the day so far is only around
7mph. The peak gust so far is 21mph, which occurred just after 1pm.
Thanks to the lower dew points, it has been another excellent day
for visibility. We have enjoyed about 60 miles throughout the day.
The maximum temperature for today is 82F degrees, which is 1
degree above the normal high of 81F. The minimum temperature
since midnight is 61F degrees, which is 2 degrees below the normal
low of 63F.
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Today’s Observations:
7 A.M.
Weather: Broken cirrus, few altocumulus N-E-SSE
Temperature: 68F; Dew Point: 52F; Relative Humidity: 55%
Wind: W @ 3 kts, wind light
Sea-level pressure: 1022.3 mb; 30.19 in. Hg: falling, then
rising
Visibility: 60 miles
6-hr Max temp: 68F
6-hr Min temp: 61F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 BKN 60 223/68/52/2703/019/ FEW AC N-E-SSE
WND LGT/ 8/054 53017 10068 20061
10 A.M.
Weather: Broken cirrostratus, sun dimly visible
Temperature: 77F; Dew Point: 54F; Relative Humidity: 44%
Wind: WSW @ 6 kts, wind light
Sea-level pressure: 1022.2 mb; 30.19 in. Hg: rising, then
falling
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E220 BKN 60 222/77/54/2506/019/ SUN DMLY VSBL
WND LGT/ 8/007 58001
1 P.M.
Weather: Broken cirrostratus, few cumulus all quadrants
Temperature: 82F Dew Point: 54F; Relative Humidity: 38%
Wind: SW @ 8 kts
Sea-level pressure: 1020.8 mb; 30.14 in. Hg: rising, then
falling
Visibility: 60 miles
6-hr Max temp: 82F
6-hr Min temp: 68F
6-hr Precip: 0.00 inches
BHO SA 1755 E220 BKN 60 208/82/54/2308/014/ FEW CU ALQDS/
8/206 58014 10082 20068
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SUMMARY FOR FRIDAY, JULY 4, 2025
TEMPERATURE (DEGREES F)
MAX…….80 NORMAL…..81
MIN…….60 NORMAL…..63
MEAN……70 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-2
TOTAL DEPARTURE FOR THE MONTH………………………+16 [+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……..-2
TOTAL HEATING UNITS FOR THE SEASON…………….0 DEPARTURE……..-2
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……..-2
TOTAL COOLING UNITS FOR THE MONTH…………….42 DEPARTURE…….+15
TOTAL COOLING UNITS FOR THE SEASON…………..242 DEPARTURE…….+76
TOTAL COOLING UNITS LAST SEASON TO DATE………205 DEPARTURE…….+37
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)……….E28 NNW @ 11:26 A.M.
VECTOR #1 (1-Sec)……….27 NNW @ 11:26 A.M.
VECTOR #2 (1-Sec)……….27 NW @ 11:56 A.M.
DAVIS #1……………….26 W @ 10:31 A.M.
DAVIS #2 ………………25 NW @ 09:20 A.M.
RMY #1 (Instantaneous)…..29 NW @ 11:27 A.M.
RMY #2 (Instantaneous)…..28 NW @ 11:56 A.M.
MERLIN…………………25 NNW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 NW @ 11:58 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 @ 11:58 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 @ 11:28 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 NW @ 11:58 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 NNW @ 11:28 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 NW @ 11:58 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 NW @ 11:28 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.9 NW [214 total miles]
VECTOR #1……………….9.1
VECTOR #2……………….9.5
DAVIS #1………………..9.2 NW
DAVIS #2………………..9.2 NNW
RMY #1………………….8.9 NW
RMY #2………………….9.3 NW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..0.19 DEPARTURE…..-0.26
TOTAL PRECIPITATION FOR THE YEAR (2025)…….23.42 DEPARTURE…..-4.26
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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/…/.. 39 SW VEC1 39 SW RMY 40 TSTM
7/4 80/60/70/-2/0.00/…/.. 28 NNW VEC1 27 NNW RMY 29
7/5 The low since midnight is 61F, the daily normal low is 63F.
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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 5
HIGH 98F IN 1911
LOW 48F IN 1920, 1927 & 1979
PRECIP 1.45 INS IN 1922
PEAK GUST 49e N IN 1944
RECORDS FOR JULY 6
HIGH 99F IN 2010
LOW 47F IN 1979
PRECIP 1.43 INS IN 2005
PEAK GUST 56e MPH NNW IN 1942, 56 MPH WNW IN 1999
TODAY’S REPORT PREPARED BY: Amanda Joly
