Saturday, July 12, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JULY 12, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0419E
SUNSET: 1921E
ANOTHER FOGGY MORNING, PLENTY OF SUNSHINE AND HUMID CONDITIONS….
This morning we had significant fog in the area. Once the fog lifted
the sun was out for much of the day with a fair mix of cumulus and
altocumulus clouds in the sky. Because of the increase of the dew
point, hazy conditions started to impact the visibility by the early
afternoon hours.
Temperatures have been more seasonable today. Unfortunately, the dew
points have also been on the rise and it has felt quite warm and
sticky out there today. Dew point values started at around 66F this
morning and were up to 71F by the afternoon.
The wind has been light again today, though it’s been slightly more
active than yesterday. Winds have been mostly out of the south-
southwest for much of the morning and has turned more to the south-
southeast by the afternoon. The average speed for the day so far is
around 6mph. The peak gust for the day so far is 17mph, which
occurred right at midnight.
Due to the morning foggy conditions we had limited visibility of
only about 1/4 mile. Once the fog lifted we were able to improve
to around 30-35 miles, though hazy conditions kept us from getting
much more than that.
The maximum temperature so far today is 84F degrees, which is
2 degrees above the normal high of 82F. The minimum temperature
since midnight is 65F degrees, which is 1 degree above the normal
low of 64F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 200 ft
Temperature: 66F; Dew Point: 66F; Relative Humidity: 100%
Wind: SSW @ 4 kts, wind light
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: rising, then
more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 66F
6-hr Min temp: 65F
24-hr Precip: 0.00 inches
BHO SA 1155 X W2 1/4F 200/66/66/2004/012/ WND LGT/ 8////
53006 10066 20065
10 A.M.
Weather: Broken altocumulus, few cumulus all quadrants
Temperature: 74F; Dew Point: 69F; Relative Humidity: 83%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1020.4 mb; 30.13 in. Hg: rising, then
more slowly
Visibility: 30 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E180 BKN 30 204/74/69/2006/013/ FEW CU ALQDS WND LGT/
8/250 51004
1 P.M.
Weather: Scattered cumulus
Temperature: 82F Dew Point: 74F; Relative Humidity: 67%
Wind: SSE @ 7 kts
Sea-level pressure: 1019.8 mb; 30.11 in. Hg: rising, then
falling
Visibility: 30 miles, hazy
6-hr Max temp: 84F
6-hr Min temp: 66F
6-hr Precip: 0.00 inches
BHO SA 1755 150 SCT 30 198/82/74/1507/011/ HAZY 8/200 58006
10084 20066
————————————————————–
SUMMARY FOR FRIDAY, JULY 11, 2025
TEMPERATURE (DEGREES F)
MAX…….80 NORMAL…..82
MIN…….62 NORMAL…..64
MEAN……71 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-2
TOTAL DEPARTURE FOR THE MONTH………………………+25 [+2.1 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……………..1 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON…………….1 DEPARTURE……..-2
TOTAL HEATING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..6 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………104 DEPARTURE…….+23
TOTAL COOLING UNITS FOR THE SEASON…………..304 DEPARTURE…….+84
TOTAL COOLING UNITS LAST SEASON TO DATE………300 DEPARTURE……..+4
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)……….E18 SSW @ 04:49 P.M.
VECTOR #1 (1-Sec)……….18 SSW @ 04:49 P.M.
VECTOR #2 (1-Sec)……….18 S @ 09:54 P.M.
DAVIS #1……………….20 S @ 04:49 P.M.
DAVIS #2 ………………21 S @ 10:03 P.M.
RMY #1 (Instantaneous)…..18 S @ 10:03 P.M.
RMY #2 (Instantaneous)…..19 SSW @ 10:02 P.M.
MERLIN…………………17 S
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 SSW @ 11:37 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 @ 11:37 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 11:05 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 S @ 11:06 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 S @ 11:06 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SSW @ 11:37 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 S @ 11:06 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………4.8 NE [116 total miles]
VECTOR #1……………….5.8
VECTOR #2……………….6.0
DAVIS #1………………..5.0 SSW
DAVIS #2………………..5.2 SSW
RMY #1………………….5.5 S
RMY #2………………….6.0 S
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…………..5.14 DEPARTURE…..+3.93
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.37 DEPARTURE…..-0.07
————————————————————–
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 66/61/64/-9/3.85/…/.. 24 ENE VEC1 24 ENE RMY 24 TSTM
7/11 80/62/71/-2/0.00/…/.. 18 SSW VEC1 18 SSW RMY 18
7/12 The low since midnight is 65F, the daily normal low is 64F.
————————————————————–
JULY DAILY RECORDS TO DATE
7/10 RECORD HIGHEST PRECIPITATION OF 3.85 INCHES;
BEATING OLD RECORD OF 1.95 INCHES SET IN 2015
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 12
HIGH 96F IN 1908
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944
RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996
TODAY’S REPORT PREPARED BY: Amanda Joly
