Thursday, July 31, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, JULY 31, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0436E
SUNSET: 1904E
COOLER AND CLOUDY WITH SCATTERED VERY LIGHT RAIN SHOWERS….
Clouds have been the theme today with a few very light rain
showers passing over Blue Hill today. A heavier thunderstorm
did pass north of here and over Boston late this morning, but
thunder was not heard here at Blue Hill. So far only a trace
of rain has been “measured” here at the summit.
Temperatures are much cooler today, and actually have been on
a downward trend as the day has progressed. The high for the
day occurred at midnight when it was in the upper 70s. By the
1pm observation the temperature had dropped into the upper 60s,
which is the low for the day so far. Needless to say, it feels
much better today than it has the past few days.
The wind has been steady out of the northeast today, averaging
at around 10mph. It has been a bit gusty today as well with
gusts exceeding 25mph at times. The peak gust so far the day
is 28mph, which occurred just after 11:45am this morning.
Visibility has been limited today due to haziness, and at times
rain showers. The view has been varying between 10-25 miles
throughout the day.
The maximum temperature so far today is 78F degrees, which is
4 degrees below the normal high of 82F. The minimum temperature
since midnight is 67F degrees, which is 3 degrees above the
normal low of 64F.
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Today’s Observations:
7 A.M.
Weather: Broken altocumulus/altostratus, broken altocumulus castellanus,
broken cirrocumulus
Temperature: 74F; Dew Point: 66F; Relative Humidity: 75%
Wind: NE @ 9G18 kts
Sea-level pressure: 1017.6 mb; 30.05 in. Hg: rising, then more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 73F
24-hr Precip: 0.00 inches
BHO SA 1155 E75 BKN 100 BKN 180 BKN 20 176/74/66/0509G18/005/
HAZY/ 8/079 53018 10076 20073
10 A.M.
Weather: Overcast altocumulus/altostratus, cumulonimbus N-NNE
moving E, few lower altocumulus castellanus
Temperature: 71F; Dew Point: 64F; Relative Humidity: 77%
Wind: NNE @ 10G20 kts
Sea-level pressure: 1018.8 mb; 30.09 in. Hg: rising steadily
Visibility: 25 miles, hazy
3-hr Precip: Trace
BHO SA 1455 E60 OVC 25 188/71/64/0310G20/009/ CB N-NNE MOV E
FEW LWR ACC WNW-NW RW-B07E28 HAZY VSBY 7 WNW-NNE/ 8/07/ 52012 6000/
1 P.M.
Weather: Overcast altostratus, few cumulus/cumulus fractus all
quadrants
Temperature: 69F Dew Point: 63F; Relative Humidity: 79%
Wind: NE @ 10G20 kts
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: falling, then rising
Visibility: 15 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 67F
6-hr Precip: Trace
BHO SA 1755 E55 OVC 15 195/69/63/0410G20/011/ FEW CU/CUFRA ALQDS
HAZY VSBY 20 ESE-SSW 10 NW-NE/ 8/72/ 53007 6000/ 10075 20067
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SUMMARY FOR WEDNESDAY, JULY 30, 2025
TEMPERATURE (DEGREES F)
MAX…….95 NORMAL…..82
MIN…….73 NORMAL…..64
MEAN……84 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+11
TOTAL DEPARTURE FOR THE MONTH………………………+77 [+2.4 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……..-6
TOTAL HEATING UNITS FOR THE SEASON…………….1 DEPARTURE……..-6
TOTAL HEATING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY…………….19 DEPARTURE…….+11
TOTAL COOLING UNITS FOR THE MONTH……………308 DEPARTURE…….+68
TOTAL COOLING UNITS FOR THE SEASON…………..508 DEPARTURE……+129
TOTAL COOLING UNITS LAST SEASON TO DATE………485 DEPARTURE…….+23
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)……….E22 SW @ 03:31 P.M.
VECTOR #1 (1-Sec)……….22 SW @ 03:31 P.M.
VECTOR #2 (1-Sec)……….23 SW @ 03:34 P.M.
DAVIS #1……………….21 SW @ 03:29 P.M.
DAVIS #2 ………………21 WSW @ 03:32 P.M.
RMY #1 (Instantaneous)…..21 WSW @ 03:34 P.M.
RMY #2 (Instantaneous)…..23 SW @ 03:34 P.M.
MERLIN…………………20 SW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 WSW @ 03:38 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 03:35 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 @ 03:35 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 SW @ 03:35 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 WSW @ 03:35 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 SW @ 03:35 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 SW @ 03:35 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.8 WSW [164 total miles]
VECTOR #1……………….7.4
VECTOR #2……………….7.6
DAVIS #1………………..7.3 WNW
DAVIS #2………………..7.4 WNW
RMY #1………………….7.1 WNW
RMY #2………………….7.6 WNW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..5.69 DEPARTURE…..+2.34
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.92 DEPARTURE…..-1.66
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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/+4/0.03/748/82 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/-9/3.85/000/00 24 ENE VEC1 24 ENE RMY 24 TSTM
7/11 80/62/71/-2/0.00/190/21 18 SSW VEC1 18 SSW RMY 18
7/12 84/65/75/+2/0.00/505/56 20 S VEC1 20 S RMY 19
7/13 85/63/74/+1/0.00/505/56 21 SSW VEC1 21 SSW RMY 21
7/14 81/65/73/0/T/216/24 23 SW VEC1 23 SW RMY 25
7/15 90/71/81/+8/0.06/665/74 24 SSW VEC1 24 SSW RMY 24
7/16 93/71/82/+9/0.00/690/77 24 SSW VEC1 24 SSW RMY 23
7/17 89/73/81/+8/0.00/573/64 41 WNW VEC1 41 WNW RMY 42
7/18 81/67/74/+1/0.00/786/88 36 WNW VEC1 36 WNW RMY 37
7/19 84/62/73/0/0.00/882/99 23 SW VEC1 22 SW RMY 21
7/20 85/65/75/+2/0.41/338/38 31 NW VEC1 31 NW RMY 31 TSTM
7/21 78/61/70/-3/0.00/817/92 31 NNW VEC1 31 NNW RMY 33
7/22 77/55/66/-7/0.00/816/92 20 SSE VEC1 19 SSE RMY 20
7/23 83/60/72/-1/0.00/850/96 25 SSW VEC1 25 SSW RMY 25
7/24 87/63/75/+2/0.00/821/93 29 SSW VEC1 29 SSW RMY 30
7/25 95/69/82/+9/T/670/76 24 WSW VEC1 24 WSW RMY 25 TSTM
7/26 79/65/72/-1/0.00/712/81 25 NE VEC1 25 NE RMY 25
7/27 73/63/68/-5/0.08/70/8 29 SSW VEC1 29 SSW RMY 29
7/28 88/68/78/+5/0.00/639/73 18 SSW VEC1 18 SSW RMY 17
7/29 96/71/84/+11/0.00/786/90 23 W VEC1 23 W RMY 23
7/30 95/73/84/+11/0.00/740/85 22 SW VEC1 22 SW RMY 21
7/31 The low since midnight is 67F, the daily normal low is 64F.
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JULY DAILY RECORDS TO DATE
7/10 RECORD HIGHEST PRECIPITATION OF 3.85 INCHES;
BEATING OLD RECORD OF 1.95 INCHES SET IN 2015
7/16 TIED RECORD HIGH MINIMUM TEMPERATURE OF 71F;
ALSO SET IN 1901, 1958, 1968, 2013, AND 2023
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971
RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985
TODAY’S REPORT PREPARED BY: MFD/Amanda Joly
