Saturday, August 16, 2025

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

SATURDAY, AUGUST 16, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0453E
SUNSET:  1843E

WARMER CONDITIONS RETURN, PLENTY OF SUNSHINE….

Skies began the morning here clear, with not a single cloud in
the sky! Since then, a few small cumulus have developed. With
the abundant sunshine and flow shifting to a more southerly
direction, temperatures today are a bit warmer than yesterday,
but it remains a beautiful day to get outside!

The low this morning was in the low 60s, seasonable for this
time of year. Shortly after sunrise, the temperature began to
climb rapidly, reaching into the mid 80s by the early afternoon.
The dew point has fallen a touch due to mixing, dropping from
the low 60s to the upper 50s, providing a comfortable feel.

Winds have been on the light side today, with an average speed of
only 6mph. The wind did go calm for an hour around 7am, before slowly
picking up again. Direction is variable with light speeds, but is now
out of the south-southwest. The peak gust thus far is only 15mph,
taking place shortly after noon time.

Visibility is limited today, this morning because of pollution
trapped under an inversion, and now due to general haziness. 30
miles is the best the view has gotten so far.

The maximum temperature so far today is 85F degrees, which is
5 degrees above the normal high of 80F. The minimum temperature
since midnight is 62F degrees, which is 1 degree below the
normal low of 63F.

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Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 70F; Dew Point: 62F; Relative Humidity: 76%
Wind: Calm
Sea-level pressure: 1023.1 mb; 30.21 in. Hg: rising, then falling
Visibility: 30 miles, hazy, thin smoke layer along horizon all quadrants
6-hr Max temp: 70F
6-hr Min temp: 62F
24-hr Precip:  0.00 inches
BHO SA 1155 CLR 30 231/70/62/0000/021/ THN K LYR ALNG HRZN ALQDS HAZY
WND CALM/ 8/000 50001 10070 20062

10 A.M.
Weather: Clear, few small cumulus distant WSW-W
Temperature: 79F; Dew Point: 58F Relative Humidity: 49%
Wind: S @ 4 kts, wind light
Sea-level pressure: 1021.9 mb; 30.18 in. Hg: falling unsteadily
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 30 219/79/58/1904/018/ FEW SML CU DSNT WSW-W HAZY
WND LGT/ 8/100 57012

1 P.M.
Weather: Scattered cumulus
Temperature: 84F Dew Point: 59F; Relative Humidity: 43%
Wind: S @ 4 kts, wind light
Sea-level pressure: 1020.4 mb; 30.13 in. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 59F
6-hr Precip:  0.00 inches
BHO SA 1755 45 SCT 30 204/84/59/1804/013/ HAZY WND LGT/ 8/200 58015
10085 20070

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SUMMARY FOR FRIDAY, AUGUST 15, 2025

TEMPERATURE (DEGREES F)
MAX…….75   NORMAL…..81
MIN…….63   NORMAL…..63
MEAN……69   NORMAL…..72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-3
TOTAL DEPARTURE FOR THE MONTH………………………..0 [-0.2 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……..-3
TOTAL HEATING UNITS FOR THE SEASON…………….1  DEPARTURE……..-9
TOTAL HEATING UNITS LAST SEASON TO DATE………..2  DEPARTURE……..-1

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..4  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH……………114  DEPARTURE………0
TOTAL COOLING UNITS FOR THE SEASON…………..625  DEPARTURE……+125
TOTAL COOLING UNITS LAST SEASON TO DATE………628  DEPARTURE……..-3

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)………..29 NE   @   09:21 A.M.
VECTOR #1 (1-Sec)……….29 ENE  @   09:25 A.M.
VECTOR #2 (1-Sec)……….30 NE   @   09:22 A.M.
DAVIS #1……………….28 ENE  @   09:20 A.M.
DAVIS #2 ………………28 ENE  @   09:20 A.M.
RMY #1 (Instantaneous)…..31 NE   @   09:34 A.M.
RMY #2 (Instantaneous)…..34 NE   @   09:20 A.M.
MERLIN…………………27 NE
RICHARDS (C5C) (Inst)……29      @   09:43 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 NE   @   09:28 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @   09:24 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20      @   09:27 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 ENE  @   09:24 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 ENE  @   09:22 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 ENE  @   09:24 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 NE   @   09:27 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18      @   09:23 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.9 ENE [261 total miles] VECTOR #1………………10.6
VECTOR #2………………11.4
DAVIS #1……………….11.2 ENE
DAVIS #2……………….11.2 ENE
RMY #1…………………10.6 ENE
RMY #2…………………11.2 NE
RICHARDS (C5C)………….11.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..1.12 DEPARTURE…..-0.84
TOTAL PRECIPITATION FOR THE YEAR (2025)…….30.57 DEPARTURE…..-2.09

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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 The low since midnight is 62F, 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 16
HIGH 95F IN 1944
LOW 50F IN 1927
PRECIP 1.31 INCHES IN 1951
PEAK GUST 45e MPH N IN 1951

RECORDS FOR AUGUST 17
HIGH 97F IN 1944
LOW 48F IN 1902
PRECIP 2.17 INCHES IN 1998
PEAK GUST 50e MPH SSW IN 1952, 50 MPH WNW IN 1962

TODAY’S REPORT PREPARED BY: Joshua Polen