Saturday, August 9, 2025

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

SATURDAY, AUGUST 9, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0445E
SUNSET:  1853E

ANOTHER BEAUTIFUL SEASONABLE DAY ON BLUE HILL TODAY….

Today has been a near carbon copy of yesterday, though
slightly cooler and less clouds overhead. We have enjoyed
another day of brilliant sunshine and lower dew points
making for another exceptional day to be out and about.
For much of the day we had mostly clear skies with the
exception of some distant altocumulus offshore. By the
afternoon, some altocumulus clouds could be seen in the
west and southeast quadrants.

Temperatures have been seasonable for another day, with a
high so far one degree above normal. Our overnight low was
60F and slowly increased as the clear skies and sun persisted.
Dew points have remained in the mid 50s throughout the day
making it for another comfortable day humidity-wise.

The wind has been light again for the day, with a general
flow out of the southeast and south-southwest. The average
speed for the day so far is only around 7mph. The peak gust
so far for the day is just 12mph, which occurred just before
6am this morning.

Visibility has been in the 30-40 mile range throughout the day.

The maximum temperature so far today is 82F degrees, which is
1 degree above the normal high of 81F. The minimum temperature
since midnight is 60F degrees, which is 4 degrees below the
normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant ENE-ESE-S
Temperature: 65F; Dew Point: 55F; Relative Humidity: 70%
Wind: S @ 6 kts, wind light
Sea-level pressure: 1025.5 mb; 30.28 in. Hg: rising, then
more slowly
Visibility: 40 miles
6-hr Max temp: 65F
6-hr Min temp: 60F
24-hr Precip:  0.00 inches
BHO SA 1155 CLR 40 255/65/55/1806/028/ FEW AC DSNT ENE-ESE-S
WND LGT/ 8/050 51009 10065 20060

10 A.M.
Weather: Clear, few altocumulus distant E-SSE
Temperature: 75F; Dew Point: 55F Relative Humidity: 50%
Wind: SE @ 4 kts, wind light
Sea-level pressure: 1025.2 mb; 30.27 in. Hg: rising, then
falling
Visibility: 35 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 35 252/75/55/1404/027/ FEW AC DSNT E-SSE
WND LGT/ 8/050 58003

1 P.M.
Weather: Clear, few altocumulus SE and W-WNW
Temperature: 82F Dew Point: 54F; Relative Humidity: 38%
Wind: SSE @ 4 kts, wind light and variable
Sea-level pressure: 1023.5 mb; 30.22 in. Hg: falling, then
more rapidly
Visibility: 30 miles
6-hr Max temp: 82F
6-hr Min temp: 65F
6-hr Precip:  0.00 inches
BHO SA 1755 CLR 30 235/82/54/1504/022/ FEW AC SE AND W-WNW
WND L/V/ 8/050 58017 10082 20065

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SUMMARY FOR FRIDAY, AUGUST 8, 2025

TEMPERATURE (DEGREES F)
MAX…….83   NORMAL…..81
MIN…….61   NORMAL…..64
MEAN……72   NORMAL…..72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………..0
TOTAL DEPARTURE FOR THE MONTH………………………-30 [-3.6 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……..-2
TOTAL HEATING UNITS FOR THE SEASON…………….1  DEPARTURE……..-8
TOTAL HEATING UNITS LAST SEASON TO DATE………..2  DEPARTURE……..-1

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..7  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….35  DEPARTURE…….-28
TOTAL COOLING UNITS FOR THE SEASON…………..546  DEPARTURE…….+97
TOTAL COOLING UNITS LAST SEASON TO DATE………580  DEPARTURE…….-34

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)………..21 SSW  @   05:52 P.M.
VECTOR #1 (1-Sec)……….21 SSW  @   06:00 P.M.
VECTOR #2 (1-Sec)……….20 S    @   06:37 P.M.
DAVIS #1……………….22 S    @   05:59 P.M.
DAVIS #2 ………………25 S    @   06:12 P.M.
RMY #1 (Instantaneous)…..21 SSW  @   05:52 P.M.
RMY #2 (Instantaneous)…..21 S    @   06:37 P.M.
MERLIN…………………18 S
RICHARDS (C5C) (Inst)……19 S    @   06:37 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 S    @   06:02 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14      @   05:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16      @   06:01 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 S    @   06:01 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 S    @   06:38 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 S    @   06:02 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 S    @   06:01 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 S    @   06:02 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.7 S [161 total miles] VECTOR #1……………….7.4
VECTOR #2……………….7.8
DAVIS #1………………..7.1 SSW
DAVIS #2………………..7.5 SSW
RMY #1………………….7.2 SSW
RMY #2………………….7.8 SSW
RICHARDS (C5C)…………..7.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.44 DEPARTURE…..-0.62
TOTAL PRECIPITATION FOR THE YEAR (2025)…….29.89 DEPARTURE…..-1.87

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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/…/..            18 ESE VEC1 18 ESE RMY 17
8/8   83/61/72/0/0.00/…/..             21 SSW VEC1 21 SSW RMY 21

8/9 The low since midnight is 60F, the daily normal low is 64F.

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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 9
HIGH 100F IN 1949
LOW 49F IN 1899
PRE 2.65 INS IN 1976
PEAK GUST 90 MPH SW IN 1968

RECORDS FOR AUGUST 10
HIGH 101F IN 1949 [STATION RECORD MAXIMUM – Tied with 8/2/1975] LOW 49F IN 1964
PRE 2.27 INS IN 1952
PEAK GUST 88e MPH S IN 1976

TODAY’S REPORT PREPARED BY: Amanda Joly