Monday, July 28, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, JULY 28, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0433E
SUNSET: 1908E
EARLY MORNING FOG BURNS OFF TO HOT AND HAZY SUNSHINE….
Early morning fog was quite dense for a time this morning,
lowering visibility to around 1/16th of a mile for a while. By
9am, the low clouds and fog had burned off leaving with very
hazy sunshine and rapidly warming temperatures.
Temperatures have risen into the upper 80s early this afternoon.
The dew point has also been on the rise, from the upper 60s
this morning to the low 70s by early this afternoon. Heat Index
values have pushed into the lower 90s thanks to the increasingly
oppressive humidity levels.
The wind has been light, and at times quite variable as we’ve
been sort of sitting near the sea-breeze line. It has shown a
tendency to increase a bit this afternoon from an onshore
direction as the sea-breeze attempts to strengthen a bit. This
however has not had much impact on the temperature to this
point. The average speed for the day so far is around 6mph, with
a peak gust of 15mph occurring around 1:30pm this afternoon.
Visibility has been limited today, first by the dense fog early
this morning, and then by haziness, some of which is still a
result of the lingering wildfire smoke from Canada. The view
improved from 1/16th of a mile early this morning to around
25 miles by early this afternoon.
The maximum temperature so far today is 88F degrees, which is
6 degrees above the normal high of 82F. The minimum temperature
since midnight is 68F degrees, which is 4 degrees above the
normal low of 64F.
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Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 100ft
Temperature: 69F; Dew Point: 69F; Relative Humidity: 100%
Wind: ENE @ 4 kts, wind light
Sea-level pressure: 1016.2 mb; 30.01 in. Hg: rising, then more slowly
Visibility: 1/16 mile, fog
6-hr Max temp: 71F
6-hr Min temp: 68F
24-hr Precip: 0.08 inches
BHO SA 1155 X W1 1/16F 162/69/69/0604/001/ WND LGT/ 8//// 51014
70008 10071 20068
10 A.M.
Weather: Clear, few cumulus all quadrants, few cirrus distant SW-NW
Temperature: 80F; Dew Point: 70F; Relative Humidity: 70%
Wind: NNW @ 3 kts, wind light
Sea-level pressure: 1016.3 mb; 30.01 in. Hg: rising, then falling
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 20 163/80/70/3403/001/ FEW CU ALQDS FEW CI DSNT
SW-NW HAZY WND LGT/ 8/201 50001
1 P.M.
Weather: Clear, few cumulus OVHD-SE-SW-N, few cirrus all quadrants
Temperature: 86F Dew Point: 71F; Relative Humidity: 59%
Wind: ESE @ 5 kts, wind light
Sea-level pressure: 1015.9 mb; 30.00 in. Hg: rising, then falling
Visibility: 25 miles, hazy
6-hr Max temp: 88F
6-hr Min temp: 69F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 25 159/86/71/1205/000/ FEW CU OVHD-SE-SW-N
FEW CI ALQDS HAZY WND LGT/ 8/201 58004 10088 20069
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SUMMARY FOR SUNDAY, JULY 27, 2025
TEMPERATURE (DEGREES F)
MAX…….83 NORMAL…..82
MIN…….63 NORMAL…..64
MEAN……68 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5
TOTAL DEPARTURE FOR THE MONTH………………………+50 [+1.7 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……………..1 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON…………….1 DEPARTURE……..-5
TOTAL HEATING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+1
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..3 DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE MONTH……………257 DEPARTURE…….+42
TOTAL COOLING UNITS FOR THE SEASON…………..457 DEPARTURE……+103
TOTAL COOLING UNITS LAST SEASON TO DATE………464 DEPARTURE……..-7
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 SSW @ 11:59 A.M.
VECTOR #1 (1-Sec)……….29 SSW @ 11:59 A.M.
VECTOR #2 (1-Sec)……….29 SSW @ 12:09 P.M.
DAVIS #1……………….28 SSW @ 12:00 P.M.
DAVIS #2 ………………28 S @ 12:46 P.M.
RMY #1 (Instantaneous)…..29 SSW @ 01:42 P.M.
RMY #2 (Instantaneous)…..29 SSW @ 12:09 P.M.
MERLIN…………………26 SW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SSW @ 12:08 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 @ 12:11 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20 @ 12:10 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 SSW @ 12:11 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 SSW @ 12:11 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 SSW @ 12:11 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 SSW @ 12:10 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.5 SW [276 total miles]
VECTOR #1………………11.7
VECTOR #2………………12.3
DAVIS #1……………….11.3 SW
DAVIS #2……………….12.1 SW
RMY #1…………………11.5 SW
RMY #2…………………12.4 SW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.08 DEPARTURE…..-0.04
TOTAL PRECIPITATION FOR THE MONTH…………..5.69 DEPARTURE…..+2.69
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.92 DEPARTURE…..-1.31
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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 The low since midnight is 68F, 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 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006
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
TODAY’S REPORT PREPARED BY: MFD/JN
