Wednesday, July 9, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, JULY 9, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0416E
SUNSET: 1922E
MUCH NEEDED RAINFALL OVERNIGHT, MUCH COOLER, BUT DAMP WEATHER
TODAY….
Showers and thunderstorms overnight into early this morning
brought a good soaking of rain to the area, helping to alleviate
the dryness a bit for the short term. 1.09″ of rain was recorded
for the period with over 0.50″ falling in the hour between
midnight and 1am.
Showers waned by mid morning, but skies have remained overcast
for the day. The fog has slowly lifted allowing for a bit of
visibility, but it’s still quite limited.
The temperature has “only” reached the low 70s today, which is in
stark contrast to the mid 90s of yesterday. While the air is full
of moisture making it feel humid, the much cooler temperatures
does feel quite nice today.
The wind has been on the light side today, mainly out of an
easterly direction. The average speed for the day so far is only
around 6mph. The peak gust for the day occurred just after
midnight during a thunderstorm with a value of 26mph.
Visibility was only around 1/16th to 1/8th of a mile early this
morning, but has gradually improved to around 10 miles by early
this afternoon as the low cloud base has lifted off the summit.
The maximum temperature so far today is 72F degrees, which is
10 degrees below the normal high of 82F. The minimum temperature
since midnight is 65F degrees, which is 1 degree above the normal
low of 64F.
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Today’s Observations:
7 A.M.
Weather: Sky partially obscured, overcast altocumulus, very light
rain showers
Temperature: 68F; Dew Point: 68F; Relative Humidity: 100%
Wind: NE @ 5 kts, wind light
Sea-level pressure: 1017.2 mb; 30.04 in. Hg: rising, then more slowly
Visibility: 1/8 mile, fog
6-hr Max temp: 68F
6-hr Min temp: 65F
24-hr Precip: 1.09 inches
BHO SA 1155 -X E65 OVC 1/8RW-F 172/68/68/0405/004/ PCPN VRY LGT
WND LGT/ 8/75/ 51013 6021/ 70109 10068 20065
10 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 68F; Dew Point: 68F; Relative Humidity: 100%
Wind: NE @ 7 kts
Sea-level pressure: 1017.7 mb; 30.05 in. Hg: rising, then more rapidly
Visibility: 1/2 miles, fog
3-hr Precip: Trace
BHO SA 1455 X W2 1/2F 177/68/68/0407/005/ 8//// 53005 6000/
1 P.M.
Weather: Overcast stratus
Temperature: 71F Dew Point: 68F; Relative Humidity: 90%
Wind: NE @ 6 kts, wind light
Sea-level pressure: 1017.8 mb; 30.06 in. Hg: falling, then rising
Visibility: 10 miles, thin fog
6-hr Max temp: 72F
6-hr Min temp: 68F
6-hr Precip: Trace
BHO SA 1755 E6 OVC 10 178/71/68/0506/006/ THN F ALQDS WND LGT/
8/6// 53001 6000/ 10072 20068
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SUMMARY FOR TUESDAY, JULY 8, 2025
TEMPERATURE (DEGREES F)
MAX…….94 NORMAL…..81
MIN…….67 NORMAL…..63
MEAN……81 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+9
TOTAL DEPARTURE FOR THE MONTH………………………+39 [+4.7 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…………….16 DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE MONTH…………….93 DEPARTURE…….+36
TOTAL COOLING UNITS FOR THE SEASON…………..293 DEPARTURE…….+97
TOTAL COOLING UNITS LAST SEASON TO DATE………256 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)……….E24 WSW @ 11:59 P.M.
VECTOR #1 (1-Sec)……….24 WSW @ 11:59 P.M.
VECTOR #2 (1-Sec)……….25 SW @ 11:59 P.M.
DAVIS #1……………….22 W @ 02:39 P.M.
DAVIS #2 ………………23 WNW @ 12:48 P.M.
RMY #1 (Instantaneous)…..27 WSW @ 11:59 P.M.
RMY #2 (Instantaneous)…..25 SW @ 11:59 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 WNW @ 02:43 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 01:09 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 02:37 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 WNW @ 01:09 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 WNW @ 02:37 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 WSW @ 11:59 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 WNW @ 02:37 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.1 WNW [194 total miles]
VECTOR #1……………….8.5
VECTOR #2……………….9.0
DAVIS #1………………..8.5 W
DAVIS #2………………..8.8 WNW
RMY #1………………….8.3 W
RMY #2………………….8.9 W
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.09 DEPARTURE…..+0.99
TOTAL PRECIPITATION FOR THE MONTH…………..1.19 DEPARTURE…..+0.32
TOTAL PRECIPITATION FOR THE YEAR (2025)…….24.52 DEPARTURE…..-3.68
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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 92/65/79/+7/0.00/…/.. 29 SW VEC1 29 SW RMY 29
7/7 88/69/79/+7/0.01/…/.. 28 SSW VEC1 28 SSW RMY 29 TSTM
7/8 94/67/81/+9/0.36/…/.. 24 WSW VEC1 24 WSW RMY 27 TSTM
7/9 The low since midnight is 65F, 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 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992
RECORDS FOR JULY 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.95 INS IN 2015
WIND 75 MPH W IN 1985
TODAY’S REPORT PREPARED BY: MFD/KO
