Friday, August 1, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

FRIDAY, AUGUST 1, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0437E
SUNSET:  1903E

RAIN MOVES OUT EARLY MORNING, COOL START TO AUGUST….

We received 0.95 inches of rain as a front passed through the
area last night and into this morning. The total rain received
in the month of July stands at 6.22 inches which is +2.75 inches
above normal.

This morning we were in the clouds as the rain was still moving
out of the area. Once that happened, we had partly cloudy skies
and dry conditions. We did receive 0.55 inches of rain from
midnight through the early morning, so August is already off
to a wet and chilly start.

Temperatures remain below normal today, with a high temperature
only reaching 70F so far. Dew points have been hovering in the
upper 50’s for much of the day as well, which has made for a
very comfortable start to the month.

The wind has been steady out of the northeast and east-northeast
today, averaging at around 11mph. We had a few gusts later in
the morning and afternoon of around 18-20 mph. The peak gust so
far the day is 28mph, which occurred at 2:46am this morning.

Visibility was only about 1/8th of a mile this morning with the
continued rain, but marginally improved once we had some clearing
of the sky. Still though, due to some late fog and hazy conditions
in the afternoon, we only improved to about 35 miles.

The maximum temperature so far today is 70F degrees, which is
12 degrees below the normal high of 82F. The minimum temperature
since midnight is 57F degrees, which is 7 degrees below the
normal low of 64F.

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PRELIMINARY STATS FOR JULY 2025

TEMPERATURE, Deg. F
Avg. Max. 84.5 [+2.8] Avg. Min. 65.1 [+1.3] Mean      74.8 [+2.1] 24-hour corrected mean: 73.8
Max. for month: 96F on the 29th
Min. for month: 55F on the 22nd

HEATING DEGREE DAYS
Total heating units:      1 [-006] Total for the season:     1 [-006] Total for last season:    0

COOLING DEGREE DAYS
Total cooling units:    311 [+072] Total for the season:   511 [+061] Total for last season:  497

PRECIPITATION, Inches
Total: 6.22 [+2.75] Greatest in 24 hrs: 3.85 on the 10th

SNOWFALL, Inches
Total: 0.0 [ 0.0] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed:  9.3 mph
Avg. corrected wind speed:    9.9 mph
Prevailing wind direction:   South-southwest [24%] Peak gust and direction:  41 WNW on the 17th

SUNSHINE:
Campbell-Stokes card minutes: 16662 of a possible 26682, or 62%
Astronomical total minutes: 17293 of a possible 27731 or 62%

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200 ft, light rain
Temperature: 58F; Dew Point: 58F; Relative Humidity: 100%
Wind: NNE @ 9 kts
Sea-level pressure: 1022.7 mb; 30.20 in. Hg: rising, then more
slowly
Visibility: 1/8 mile, fog
6-hr Max temp: 59F
6-hr Min temp: 57F
24-hr Precip:  0.95 inches
BHO SA 1155 X W2 1/8R-F 227/58/58/0309/020/ 8//// 51015 6039/
70095 10059 20057

10 A.M.
Weather: Broken stratocumulus, broken cumulus, broken
cirrocumulus
Temperature: 64F; Dew Point: 61F; Relative Humidity: 91%
Wind: ENE @ 9G17 kts
Sea-level pressure: 1023.3 mb; 30.22 in. Hg: rising steadily
Visibility: 30 miles, thin fog all quadrants
3-hr Precip: 0.02 inches
BHO SA 1455 E20 BKN 35 BKN 180 BKN 30 233/64/61/0609G17/022/
THN F ALQDS R-E27/ 8/809 52006 6002/

1 P.M.
Weather: Scattered cumulus, scattered cirrostratus,
scattered cirrus
Temperature: 69F Dew Point: 58F; Relative Humidity: 67%
Wind: ENE @ 10G16 kts
Sea-level pressure: 1023.4 mb; 30.22 in. Hg: steady, then
rising
Visibility: 35 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 58F
6-hr Precip:  0.02 inches
BHO SA 1755 30 SCT 220 SCT 250 SCT 35 234/69/58/0708G16/022/ HAZY/
8/208 51001 6002/ 10070 20058

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SUMMARY FOR THURSDAY, JULY 31, 2025

TEMPERATURE (DEGREES F)
MAX…….78   NORMAL…..82
MIN…….58   NORMAL…..64
MEAN……68   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5
TOTAL DEPARTURE FOR THE MONTH………………………+72 [+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……………..3  DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE MONTH……………311  DEPARTURE…….+63
TOTAL COOLING UNITS FOR THE SEASON…………..511  DEPARTURE……+124
TOTAL COOLING UNITS LAST SEASON TO DATE………497  DEPARTURE…….+14

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 NE   @   02:21 P.M.
VECTOR #1 (1-Sec)……….29 NE   @   02:21 P.M.
VECTOR #2 (1-Sec)……….29 NE   @   08:06 P.M.
DAVIS #1……………….28 NE   @   02:21 P.M.
DAVIS #2 ………………27 NE   @   02:02 P.M.
RMY #1 (Instantaneous)…..29 NE   @   08:06 P.M.
RMY #2 (Instantaneous)…..30 NE   @   08:06 P.M.
MERLIN…………………27 NE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 NE   @   02:05 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @   02:05 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19      @   02:05 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 ENE  @   09:36 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 NE   @   02:05 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 NE   @   02:05 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 NNE  @   02:05 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.3 NE [270 total miles] VECTOR #1………………11.0
VECTOR #2………………11.5
DAVIS #1……………….11.6 NE
DAVIS #2……………….11.4 NE
RMY #1…………………10.7 NE
RMY #2…………………11.2 NNE
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.95 DEPARTURE…..+0.83
TOTAL PRECIPITATION FOR THE MONTH…………..6.22 DEPARTURE…..+2.75
TOTAL PRECIPITATION FOR THE YEAR (2025)…….29.87 DEPARTURE…..-1.25

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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/-5/0.08/070/08           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  78/58/68/-5/0.53/035/04           29 NE  VEC1 29 NE  RMY 29

8/1 The low since midnight is 57F, 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 AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985

RECORDS FOR AUGUST 2
HIGH 101F IN 1975 [STATION RECORD MAXIMUM – Tied with 8/10/1949] LOW 50F IN 1929, 1947
PRECIP 1.94 INCHES IN 1946
PEAK GUST 50 MPH SW IN 2006

TODAY’S REPORT PREPARED BY: Amanda Joly/MFD