Saturday, August 2, 2025

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

SATURDAY, AUGUST 2, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0438E
SUNSET:  1902E

A BEAUTIFUL COOL, SUNNY START TO THE WEEKEND….

Today has been one of the top days of summer so far, with
cool air, below seasonable temperatures, and a gentle sea
breeze in the late morning and afternoon. The humidity
remains low and comfortable and it has felt more like an
early fall day than summer.

Temperatures are still below normal, but with the abundant
sunshine and low winds, it definitely feels warmer today
than yesterday. Overnight lows dipped down to 54F, which is
10 degrees cooler than average. Dew points have stayed in the
low to mid 50’s today, offering up some cooler and drier air.
It still feels very comfortable outside, especially for August.

The wind has been on the light side today, with a northwesterly
flow that later turned east-northeast as the sea breeze came
through. The average wind is only around 9 mph and our peak
gust of 18 mph occurred at 5:14am this morning.

Visibility has been exceptional today, with a 60-70 miles
range throughout the day. As the temperatures warmed, we
experienced less visibility, but we had 70 miles during the
early and mid morning hours.

The maximum temperature so far today is 75F degrees, which is
7 degrees below the normal high of 82F. The minimum temperature
since midnight is 54F degrees, which is 10 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: 73.9
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: Clear
Temperature: 60F; Dew Point: 54F; Relative Humidity: 78%
Wind: NNW @ 7 kts
Sea-level pressure: 1025.0 mb; 30.27 in. Hg: rising, then
falling
Visibility: 70 miles
6-hr Max temp: 60F
6-hr Min temp: 54F
24-hr Precip:  0.02 inches
BHO SA 1155 CLR 70 250/60/54/3307/027/ 8/000 50009 70002
10060 20054

10 A.M.
Weather: Clear, few altocumulus distant NNW and NE-E-ESE
Temperature: 71F; Dew Point: 53F; Relative Humidity: 54%
Wind: N @ 5 kts, wind light
Sea-level pressure: 1025.3 mb; 30.28 in. Hg: falling, then
rising
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 70 253/71/53/3605/028/ FEW AC DSNT NNW AND
NE-E-ESE WND LGT/ 8/050 53003

1 P.M.
Weather: Scattered cumulus SSE-W-N
Temperature: 74F Dew Point: 56F; Relative Humidity: 54%
Wind: ENE @ 7 kts
Sea-level pressure: 1023.4 mb; 30.22 in. Hg: falling, then
more slowly
Visibility: 60 miles
6-hr Max temp: 75F
6-hr Min temp: 60F
6-hr Precip:  0.00 inches
BHO SA 1755 55 SCT 60 238/74/56/0707/023/ 8/200 56014
10075 20060

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SUMMARY FOR FRIDAY, AUGUST 1, 2025

TEMPERATURE (DEGREES F)
MAX…….71   NORMAL…..82
MIN…….57   NORMAL…..64
MEAN……64   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-9
TOTAL DEPARTURE FOR THE MONTH……………………….-9 [+8.8 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……………..0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE SEASON…………….1  DEPARTURE……..+1
TOTAL HEATING UNITS LAST SEASON TO DATE………..0  DEPARTURE……..+1

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..1  DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE MONTH……………..1  DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE SEASON…………..512  DEPARTURE……+117
TOTAL COOLING UNITS LAST SEASON TO DATE………514  DEPARTURE……..-2

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)……….E28 NE   @   02:46 A.M.
VECTOR #1 (1-Sec)……….28 NE   @   02:46 A.M.
VECTOR #2 (1-Sec)……….28 NE   @   02:45 A.M.
DAVIS #1……………….26 ENE  @   02:46 A.M.
DAVIS #2 ………………27 ENE  @   02:45 A.M.
RMY #1 (Instantaneous)…..27 NE   @   02:23 A.M.
RMY #2 (Instantaneous)…..31 NE   @   02:45 A.M.
MERLIN…………………23 NNE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 NE   @   02:47 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @   02:46 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18      @   04:06 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 ENE  @   02:47 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 ENE  @   02:47 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 NE   @   02:46 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 NE   @   04:07 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.0 NE [217 total miles] VECTOR #1……………….9.0
VECTOR #2……………….9.6
DAVIS #1………………..9.4 ENE
DAVIS #2………………..9.2 ENE
RMY #1………………….8.9 NE
RMY #2………………….9.3 NE
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.02 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..0.44 DEPARTURE…..+0.31
TOTAL PRECIPITATION FOR THE YEAR (2025)…….29.89 DEPARTURE…..-0.94

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PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1   71/57/64/-9/0.00/…/..           28 NE   VEC1 28 NE   RMY 27

8/2 The low since midnight is 55F, the daily normal low is 64F.

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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

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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 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

RECORDS FOR AUGUST 3
HIGH 96F IN 1930
LOW 50F IN 1976
PRECIP 1.45 INCHES IN 1979
PEAK GUST 52 MPH NW IN 2008 [TSTM]

TODAY’S REPORT PREPARED BY: Amanda Joly