Wednesday, July 30, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, JULY 30, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0435E
SUNSET: 1906E
HAZY, HOT, AND HUMID WITH ABUNDANT SUNSHINE ONCE AGAIN TODAY….
Sunshine has been the theme again today as the atmosphere is
still quite warm well up the column. Some cumulus have finally
started to form, indicating a very high convective temperature
(considering the surface temperatures are in the 90s). Some
cirrus clouds have been moving across the sky most of the day
as well, but much like yesterday, they’ve been rather thin and
not doing much to filter the sun at all.
Temperatures are hot once again with readings reaching the mid
90s early this afternoon. Thankfully, we likely won’t reach
the record high for today, which is 99F set in 1949. Dew point
values have been generally holding between the mid 60s to near
70F, so it is feeling humid out there this afternoon. Heat
index values are pushing near the 100F degree mark again today.
As such extreme caution should be used outdoors today.
The wind has been quite light into early this afternoon, even
going calm for a while. But it has picked up a bit of speed
after the 1pm observation. The direction was been quite
variable through the morning, but has seemingly settled out
of the west-southwest early this afternoon. The average speed
for the day so far is only around 7mph. The peak gust is 20mph
so far, which occurred around 2pm this afternoon.
Visibility has been limited again today due to haziness. The
view has been hanging around 30-35 miles for the day so far.
The maximum temperature so far today is 94F degrees, which is
12 degrees above the normal high of 82F. The minimum temperature
since midnight is 73F degrees, which is 9 degrees above the
normal low of 64F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 79F; Dew Point: 66F; Relative Humidity: 64%
Wind: NE @ 5 kts, wind light
Sea-level pressure: 1016.8 mb; 30.03 in. Hg: rising, then more slowly
Visibility: 35 miles, hazy
6-hr Max temp: 79F
6-hr Min temp: 73F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 35 168/79/66/0505/003/ FEW CI ALQDS HAZY WND LGT/
8/001 51013 10079 20073
10 A.M.
Weather: Thin broken cirrus
Temperature: 88F; Dew Point: 70F; Relative Humidity: 56%
Wind: Calm
Sea-level pressure: 1016.6 mb; 30.02 in. Hg: falling, then rising
Visibility: 35 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E250 -BKN 35 166/88/70/0000/002/ HAZY WND CALM/
8/001 55002
1 P.M.
Weather: Clear, few cumulus all quadrants, few cirrus all quadrants
Temperature: 93F Dew Point: 67F; Relative Humidity: 43%
Heat Index: 97F
Wind: W @ 5 kts, wind light
Sea-level pressure: 1015.3 mb; 29.98 in. Hg: falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 94F
6-hr Min temp: 79F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 35 153/93/67/2805/998/ FEW CU ALQDS FEW CI ALQDS
HAZY WND LGT HX 97/ 8/201 58013 10094 20079
————————————————————–
SUMMARY FOR TUESDAY, JULY 29, 2025
TEMPERATURE (DEGREES F)
MAX…….96 NORMAL…..82
MIN…….71 NORMAL…..64
MEAN……84 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+11
TOTAL DEPARTURE FOR THE MONTH………………………+66 [+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……..-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……………289 DEPARTURE…….+58
TOTAL COOLING UNITS FOR THE SEASON…………..489 DEPARTURE……+119
TOTAL COOLING UNITS LAST SEASON TO DATE………473 DEPARTURE…….+16
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)……….E23 W @ 01:59 P.M.
VECTOR #1 (1-Sec)……….23 W @ 01:59 P.M.
VECTOR #2 (1-Sec)……….24 W @ 02:32 P.M.
DAVIS #1……………….24 W @ 01:43 P.M.
DAVIS #2 ………………22 W @ 01:59 P.M.
RMY #1 (Instantaneous)…..23 WNW @ 01:43 P.M.
RMY #2 (Instantaneous)…..25 W @ 02:32 P.M.
MERLIN…………………22 W
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 W @ 01:55 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 @ 02:33 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 02:33 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 W @ 02:33 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 WNW @ 02:33 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 W @ 02:33 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 W @ 02:33 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.2 W [220 total miles]
VECTOR #1……………….9.4
VECTOR #2……………….9.6
DAVIS #1………………..9.5 W
DAVIS #2………………..9.5 W
RMY #1………………….9.1 W
RMY #2………………….9.5 W
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…..+2.46
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.92 DEPARTURE…..-1.54
————————————————————–
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 96/71/84/+11/0.00/…/.. 23 W VEC1 23 W RMY 23
7/30 The low since midnight is 73F, 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
7/16 TIED RECORD HIGH MINIMUM TEMPERATURE OF 71F;
ALSO SET IN 1901, 1958, 1968, 2013, AND 2023
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944
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
TODAY’S REPORT PREPARED BY: MFD
