Tuesday, July 29, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JULY 29, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0434E
SUNSET: 1907E
HAZY, HOT, AND HUMID WITH ABUNDANT SUNSHINE….
Sunshine has been the theme today as the atmosphere is quite
warm well up the column. Some cumulus have been forming, but
they are not really lasting very long. Some cirrus clouds
have been advancing in from the west and northwest, but they
are rather thin and not doing much to filter the sun at all.
Temperatures have risen into the mid 90s early this afternoon
which is getting close to our record high value for today of
97F degrees set in 1949. Dew point values have been in the low
70s most of the day, but has dropped a bit into the upper 60s
early this afternoon as some dry air attempts to mix down from
aloft. Either way, heat index values are still approaching the
100F degree mark. As such extreme caution should be used
outdoors today.
The wind has been fairly steady today out of the west, but
generally under 12mph, except for a few gusts exceeding 15mph.
The average speed for the day so far is around 10mph, with a
peak gust of 22mph occurring around 12:45pm this afternoon.
Visibility has been limited today due to haziness. The view
has been hanging around 20-25 miles for the day so far.
The maximum temperature so far today is 95F degrees, which is
13 degrees above the normal high of 82F. The minimum temperature
since midnight is 71F degrees, which is 7 degrees above the
normal low of 64F.
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Today’s Observations:
7 A.M.
Weather: Scattered altocumulus/castellanus
Temperature: 77F; Dew Point: 70F; Relative Humidity: 77%
Wind: W @ 10G16 kts
Sea-level pressure: 1016.3 mb; 30.01 in. Hg: steady, then rising
Visibility: 20 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 71F
24-hr Precip: 0.00 inches
BHO SA 1155 120 SCT 20 163/77/70/2710G16/001/ HAZY/ 8/080 53005
10077 20071
10 A.M.
Weather: Clear, few cirrus distant W-NW
Temperature: 89F; Dew Point: 71F; Relative Humidity: 56%
Wind: W @ 7G15 kts
Sea-level pressure: 1016.7 mb; 30.02 in. Hg: rising, then more slowly
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 20 167/89/71/2807G15/002/ FEW CI DSNT W-NW HAZY/
8/001 51004
1 P.M.
Weather: Thin scattered cirrus, few cumulus all quadrants
Temperature: 94F Dew Point: 67F; Relative Humidity: 42%
Heat Index: 98F
Wind: W @ 11G19 kts
Sea-level pressure: 1015.1 mb; 29.98 in. Hg: falling, then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 95F
6-hr Min temp: 77F
6-hr Precip: 0.00 inches
BHO SA 1755 250 -SCT 25 151/94/67/2811G19/998/ FEW CU ALQDS
HAZY HX 98/ 8/201 56016 10095 20077
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SUMMARY FOR MONDAY, JULY 28, 2025
TEMPERATURE (DEGREES F)
MAX…….88 NORMAL…..82
MIN…….68 NORMAL…..64
MEAN……78 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+5
TOTAL DEPARTURE FOR THE MONTH………………………+55 [+1.8 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…………….13 DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH……………270 DEPARTURE…….+47
TOTAL COOLING UNITS FOR THE SEASON…………..470 DEPARTURE……+108
TOTAL COOLING UNITS LAST SEASON TO DATE………471 DEPARTURE……..-1
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 @ 09:18 P.M.
VECTOR #1 (1-Sec)……….18 SSW @ 09:18 P.M.
VECTOR #2 (1-Sec)……….18 S @ 07:49 P.M.
DAVIS #1……………….21 S @ 07:49 P.M.
DAVIS #2 ………………21 S @ 07:49 P.M.
RMY #1 (Instantaneous)…..17 SSW @ 08:41 P.M.
RMY #2 (Instantaneous)…..18 S @ 07:49 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 SSE @ 06:56 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..13 @ 08:42 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..14 @ 08:42 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 S @ 08:42 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 S @ 07:53 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..13 SSW @ 08:42 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..14 SSW @ 08:42 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.1 N [146 total miles]
VECTOR #1……………….6.8
VECTOR #2……………….7.0
DAVIS #1………………..6.5 SE
DAVIS #2………………..6.6 SE
RMY #1………………….6.6 ENE
RMY #2………………….7.0 ENE
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…………..5.69 DEPARTURE…..+2.58
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.92 DEPARTURE…..-1.42
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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/…/.. 29 SSW VEC1 29 SSW RMY 30
7/25 95/69/82/+9/T/…/.. 24 WSW VEC1 24 WSW RMY 25 TSTM
7/26 79/65/72/-1/0.00/…/.. 25 NE VEC1 25 NE RMY 25
7/27 73/63/68/-5/0.08/…/.. 29 SSW VEC1 29 SSW RMY 29
7/28 88/68/78/+5/0.00/…/.. 18 SSW VEC1 18 SSW RMY 17
7/29 The low since midnight is 71F, 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 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941
RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944
TODAY’S REPORT PREPARED BY: MFD
