Monday, July 7, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, JULY 7, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0415E
SUNSET: 1923E
HOT AND HUMID CONDITIONS AS A MORE TROPICAL-LIKE AIR MASS MOVES IN….
It looks and feels rather tropical out there today. Sunshine is
mixing with a lot of cumulus clouds, some of which are moderate
and have developed into rain showers. Despite the warm and humid
conditions, the haziness is less today than in previous days.
This is an indication that the air mass in place is nearly pure
tropical. We can thank former Tropical Storm Chantal for helping
to advect a tropical air mass into the region. Hopefully this will
also translate into getting a bit of much needed rainfall this week.
Temperatures were warm overnight, only dropping to 69F. They
quickly warmed up during the morning into the low 80s, and into the
mid to upper 80s by early this afternoon, but readings have dropped
back to the low 80s thanks to a rain shower. Dew point values have
risen as a result as well from the low 70s this morning to the mid
70s early this afternoon, yet another indicator of a tropical air
mass reaching the area.
The wind was fairly busy out of the southwest and west-southwest,
but has become more southerly early this afternoon. The average
speed for the day so far is around 13mph. The peak gust so far is
28mph, which occurred just before 10am.
Visibility had improved a bit from around 30 miles early this
morning to around 40 miles by late morning. However the view has
once again decreased thanks to rain showers in the area early this
afternoon.
The maximum temperature so far today is 88F degrees, which is 7
degrees above the normal high of 81F. The minimum temperature
since midnight is 69F degrees, which is 6 degrees above the
normal low of 63F.
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Today’s Observations:
7 A.M.
Weather: Scattered stratus fractus, broken cirrus
Temperature: 76F; Dew Point: 72F; Relative Humidity: 85%
Wind: SW @ 9G16 kts
Sea-level pressure: 1017.4 mb; 30.04 in. Hg: rising, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 69F
24-hr Precip: 0.00 inches
BHO SA 1155 8 SCT 250 BKN 30 174/76/72/2309G16/004/ HAZY/ 8/704
51006 10076 20069
10 A.M.
Weather: Scattered stratocumulus, broken cumulus, broken cirrostratus,
broken cirrus
Temperature: 82F; Dew Point: 71F; Relative Humidity: 67%
Wind: W @ 13G22 kts
Sea-level pressure: 1016.9 mb; 30.03 in. Hg: steady, then falling
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 25 SCT E35 BKN 220 BKN 250 BKN 40 169/82/71/2613G22/003/
HAZY/ 8/805 58005
1 P.M.
Weather: Scattered cumulus, broken stratocumulus, overcast
altocumulus/altostratus, few breaks in overcast N-NE, virga all
quadrants
Temperature: 80F Dew Point: 76F; Relative Humidity: 85%;
Wind: SW @ 12G20 kts
Sea-level pressure: 1016.6 mb; 30.02 in. Hg: falling, then steady
Visibility: 30 miles, 6 miles SSE-S, 15 miles W-NNW, hazy
6-hr Max temp: 88F
6-hr Min temp: 76F
6-hr Precip: 0.01 inches
BHO SA 1755 25 SCT E40 BKN 65 OVC 30 166/80/76/2212G20/002/
FEW BINOVC N-NE FEW LWR STFRA ALQDS MDT CU ALQDS HIER CLDS VSBL N-NE
VIRGA ALQDS RW-B21E31 VSBY 6 SSE-S 15 W-NNW HAZY/ 8/87/ 56003 6001/
10088 20076
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SUMMARY FOR SUNDAY, JULY 6, 2025
TEMPERATURE (DEGREES F)
MAX…….92 NORMAL…..81
MIN…….65 NORMAL…..63
MEAN……79 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+7
TOTAL DEPARTURE FOR THE MONTH………………………+23 [+3.6 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…………….14 DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE MONTH…………….63 DEPARTURE…….+21
TOTAL COOLING UNITS FOR THE SEASON…………..263 DEPARTURE…….+82
TOTAL COOLING UNITS LAST SEASON TO DATE………225 DEPARTURE…….+38
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)……….E29 SW @ 02:51 P.M.
VECTOR #1 (1-Sec)……….29 SW @ 02:51 P.M.
VECTOR #2 (1-Sec)……….30 WSW @ 03:09 P.M.
DAVIS #1……………….27 SW @ 02:51 P.M.
DAVIS #2 ………………28 S @ 03:39 P.M.
RMY #1 (Instantaneous)…..29 SW @ 02:51 P.M.
RMY #2 (Instantaneous)…..30 SSW @ 02:46 P.M.
MERLIN…………………27 SW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SW @ 06:02 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 @ 03:40 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 @ 03:40 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 SW @ 03:47 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 SSW @ 03:40 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 SW @ 02:52 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 SSW @ 03:40 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..13.2 SW [316 total miles]
VECTOR #1………………13.2
VECTOR #2………………13.7
DAVIS #1……………….12.8 SW
DAVIS #2……………….13.6 SW
RMY #1…………………13.1 SW
RMY #2…………………13.8 SW
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…..-0.48
TOTAL PRECIPITATION FOR THE YEAR (2025)…….23.42 DEPARTURE…..-4.48
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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 The low since midnight is 69F, 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 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INS IN 1966
PEAK GUST 63 MPH NW IN 2021
RECORDS FOR JULY 8
HIGH 95F IN 1981
LOW 50F IN 1919
PRECIP 1.74 INS IN 1916
PEAK GUST 46e SSW IN 1941
TODAY’S REPORT PREPARED BY: MFD
