Sunday, July 6, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, JULY 6, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0414E
SUNSET: 1923E
HAZY HOT AND HUMID CONDITIONS RETURN TO BLUE HILL….
Today’s first observation started at an oppressive 65F dew point
which was similar to the dew points we had on Thursday. As the
sun came out and the temperature increased, the dew point climbed
even higher, giving us a heat index value in the mid 90s. It is
very muggy today, so please limit outdoor activities if you can!
Temperatures overnight were above average, just making it to 65F.
After the sunrise and continued high level clouds which afforded
filtered but all day sunshine, the temperature quickly rose. We
were above seasonable by 10am and by the final observation we
reached 91F. Even though it is much warmer today, we are still a
bit from the record of 99F, which was set in 2010.
The wind has been steady out of the southwest, not giving much
of a cool breeze. The average speed for the day so far is around
13mph. The peak gust so far is 26mph, which occurred at 12:15pm.
Visibility has been impacted heavily by the humid air and hazy sky
conditions. 25-30 miles is about all we have been able to see for
much of the day.
The maximum temperature for today is 91F degrees, which is 10
degrees above the normal high of 81F. The minimum temperature
since midnight is 65F degrees, which is 2 degrees above the
normal low of 63F.
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Today’s Observations:
7 A.M.
Weather: Thinly broken cirrus
Temperature: 72F; Dew Point: 65F; Relative Humidity: 78%
Wind: SW @ 11 kts
Sea-level pressure: 1017.7 mb; 30.05 in. Hg: falling, then
rising
Visibility: 30 miles, hazy
6-hr Max temp: 72F
6-hr Min temp: 65F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 -BKN 30 177/72/65/2311/005/ HAZY/ 8/001 53003
10072 20065
10 A.M.
Weather: Broken cirrus/cirrostratus
Temperature: 85F; Dew Point: 68F; Relative Humidity: 56%
Wind: SW @ 9 kts
Sea-level pressure: 1017.1 mb; 30.03 in. Hg: steady, then
falling
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E220 BKN 25 171/85/68/2309/003/ HAZY/ 8/006 56006
1 P.M.
Weather: Broken cirrus/cirrostratus, few cumulus all quadrants
Temperature: 91F Dew Point: 70F; Relative Humidity: 49%;
Heat Index: 97F
Wind: WSW @ 12 kts
Sea-level pressure: 1015.9 mb; 30.00 in. Hg: falling, then
more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 91F
6-hr Min temp: 72F
6-hr Precip: 0.00 inches
BHO SA 1755 E220 BKN 30 159/91/70/2412/000/ FEW CU ALQDS HAZY
HX97 8/206 58012 10091 20072
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SUMMARY FOR SATURDAY, JULY 5, 2025
TEMPERATURE (DEGREES F)
MAX…….83 NORMAL…..81
MIN…….61 NORMAL…..63
MEAN……72 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………..0
TOTAL DEPARTURE FOR THE MONTH………………………+16 [+3.0 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……………..7 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….49 DEPARTURE…….+15
TOTAL COOLING UNITS FOR THE SEASON…………..249 DEPARTURE…….+76
TOTAL COOLING UNITS LAST SEASON TO DATE………216 DEPARTURE…….+33
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 W @ 04:14 P.M.
VECTOR #1 (1-Sec)……….23 W @ 04:14 P.M.
VECTOR #2 (1-Sec)……….24 WSW @ 05:27 P.M.
DAVIS #1……………….23 W @ 04:14 P.M.
DAVIS #2 ………………21 W @ 04:38 P.M.
RMY #1 (Instantaneous)…..24 W @ 05:11 P.M.
RMY #2 (Instantaneous)…..23 WSW @ 05:11 P.M.
MERLIN…………………23 W
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 W @ 04:41 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 @ 05:13 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 05:12 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 W @ 05:13 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 W @ 05:12 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 W @ 05:13 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 WSW @ 05:12 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.0 W [193 total miles]
VECTOR #1……………….8.4
VECTOR #2……………….8.6
DAVIS #1………………..8.2 WSW
DAVIS #2………………..8.3 WSW
RMY #1………………….8.3 WSW
RMY #2………………….8.6 WSW
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…..-0.37
TOTAL PRECIPITATION FOR THE YEAR (2025)…….23.42 DEPARTURE…..-4.37
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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 83/61/72/0/0.00/…/.. 23 W VEC1 23 W RMY 24
7/6 The low since midnight is 65F, 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 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
RECORDS FOR JULY 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INS IN 1966
PEAK GUST 63 MPH NW IN 2021
TODAY’S REPORT PREPARED BY: Amanda Joly
