Tuesday, August 19, 2025

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

TUESDAY, AUGUST 19, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0456E
SUNSET:  1839E

MORE CLOUDS THAN SUN TODAY, BUT STILL COMFORTABLE TEMPERATURES….

Clouds have been dominating the sky today, albeit mainly high
clouds. However they’ve been thick enough to only allow for
some partial sunshine today. This has led to yet another day
with below normal temperatures making for another refreshing
day to be outdoors.

Temperatures have reached the low 70s early this afternoon,
which is still around 10F degrees below the normal high
temperature for the date. Dew point readings have been holding
in the upper 40s and lower 50s, which has actually added a
bit of chill to the air.

The wind has been quite a bit lighter today than yesterday.
The average speed for the day so far is only 6mph, out of
mainly an easterly direction. The peak gust so far is a meager
12mph, which occurred just after 5am this morning.

Visibility has been excellent again today with the view
holding at around 70 miles!

The maximum temperature so far today is 73F degrees, which is
7 degrees below the normal high of 80F. The minimum temperature
since midnight is 54F degrees, which is 9 degrees below the
normal low of 63F.

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Today’s Observations:

7 A.M.
Weather: Broken cirrus/cirrocumulus, few stratocumulus distant
ESE-SE, few altocumulus/castellanus distant SSE-SW
Temperature: 61F; Dew Point: 51F; Relative Humidity: 69%
Wind: N @ 7 kts
Sea-level pressure: 1026.4 mb; 30.31 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 54F
24-hr Precip:  0.00 inches
BHO SA 1155 E220 BKN 70 264/61/51/0107/031/ FEW SC DSNT ESE-SE
FEW AC/ACC DSNT SSE-SW/ 8/589 51014 10061 20054

10 A.M.
Weather: Overcast cirrostratus, few breaks in overcast all quadrants,
few cumulus distant NW-NE and distant ESE-SSW
Temperature: 66F; Dew Point: 49F Relative Humidity: 55%
Wind: E @ 3 kts, wind light
Sea-level pressure: 1026.1 mb; 30.30 in. Hg: falling steadily
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E180 OVC 70 261/66/49/0803/030/ FEW BINOVC ALQDS
FEW CU DSNT NW-NE AND DSNT ESE-SSW VIRGA ALQDS WND LGT/ 8/207/ 57003

1 P.M.
Weather: Scattered cumulus, broken cirrostratus, broken cirrus
Temperature: 72F Dew Point: 52F; Relative Humidity: 49%
Wind: E @ 5 kts, wind light
Sea-level pressure: 1025.1 mb; 30.27 in. Hg: falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 73F
6-hr Min temp: 61F
6-hr Precip:  0.00 inches
BHO SA 1755 35 SCT E200 BKN 250 BKN 70 251/72/52/0905/027/
WND LGT/ 8/258 56010 10073 20061

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SUMMARY FOR MONDAY, AUGUST 18, 2025

TEMPERATURE (DEGREES F)
MAX…….68   NORMAL…..80
MIN…….55   NORMAL…..63
MEAN……62   NORMAL…..71

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-9
TOTAL DEPARTURE FOR THE MONTH……………………….-2 [-0.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..3  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH……………..3  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE SEASON…………….4  DEPARTURE……..-7
TOTAL HEATING UNITS LAST SEASON TO DATE………..2  DEPARTURE……..+2

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE MONTH……………135  DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE SEASON…………..646  DEPARTURE……+125
TOTAL COOLING UNITS LAST SEASON TO DATE………636  DEPARTURE…….+10

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)………..32 NE   @   12:48 A.M.
VECTOR #1 (1-Sec)……….34 NE   @   12:48 A.M.
VECTOR #2 (1-Sec)……….33 NE   @   12:42 A.M.
DAVIS #1……………….31 NE   @   12:48 A.M.
DAVIS #2 ………………31 ENE  @   12:42 A.M.
RMY #1 (Instantaneous)…..34 NE   @   02:28 A.M.
RMY #2 (Instantaneous)…..34 NE   @   02:02 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……32      @   12:48 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NE   @   02:03 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22      @   02:04 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23      @   02:04 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 NE   @   02:04 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 ENE  @   02:03 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 NE   @   02:04 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 NE   @   02:03 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21      @   02:04 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.8 NE [259 total miles] VECTOR #1………………10.5
VECTOR #2………………11.1
DAVIS #1……………….11.2 ENE
DAVIS #2……………….11.2 E
RMY #1…………………10.4 ENE
RMY #2…………………10.9 ENE
RICHARDS (C5C)………….10.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..1.31 DEPARTURE…..-1.03
TOTAL PRECIPITATION FOR THE YEAR (2025)…….30.76 DEPARTURE…..-2.28

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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/-9/0.44/546/63            28 NE  VEC1 28 NE  RMY 27
8/2   75/54/65/-8/0.00/838/97            18 NNW VEC1 18 NNW RMY 18
8/3   83/59/71/-2/0.00/784/91            21 SSW VEC1 21 SSW RMY 21
8/4   84/61/73/0/0.00/757/88             17 W   VEC1 17 W   RMY 17
8/5   73/62/68/-5/0.00/480/56            28 NE  VEC1 27 NE  RMY 28
8/6   77/61/69/-4/0.00/248/29            17 ENE VEC1 17 ENE RMY 16
8/7   81/61/71/-2/0.00/665/78            18 ESE VEC1 18 ESE RMY 17
8/8   83/61/72/0/0.00/834/98             21 SSW VEC1 21 SSW RMY 21
8/9   83/60/72/0/0.00/814/96             22 S   VEC1 22 SSW RMY 22
8/10  89/61/75/+3/0.00/761/90            22 S   VEC1 22 S   RMY 21
8/11  94/67/81/+9/0.00/792/94            20 W   VEC1 19 W   RMY 19
8/12  93/68/81/+9/0.00/806/96            21 SSW VEC1 21 SSW RMY 21
8/13  88/66/77/+5/0.00/344/41            25 SW  VEC1 25 SW  RMY 25
8/14  90/68/79/+7/0.68/…/..            35 NE  VEC1 34 NE  RMY 36 TSTM
8/15  75/63/69/-3/0.00/…/..            29 NE  VEC1 29 ENE RMY 31
8/16  86/62/74/+2/0.00/…/..            23 S   VEC1 24 S   RMY 23
8/17  89/64/77/+5/0.19/…/..            41 NE  VEC1 43 NE  RMY 42 TSTM
8/18  68/55/62/-9/0.00/…/..            32 NE  VEC1 34 NE  RMY 34

8/19 The low since midnight is 54F, the daily normal low is 63F.

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AUGUST DAILY RECORDS TO DATE

NONE.

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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR AUGUST 19
HIGH 92F IN 2019
LOW 48F IN 1958
PRECIP 8.07 INCHES IN 1955 [DIANE – RECORD FOR MONTH] PEAK GUST 78 MPH ENE IN 1991 – HURRICANE BOB

RECORDS FOR AUGUST 20
HIGH 94F IN 2022
LOW 48F IN 1896, 1905, 1949
PRECIP 2.71 INCHES IN 1970
PEAK GUST 47 MPH W IN 1983, 47 SSW IN 2010

TODAY’S REPORT PREPARED BY: MFD