Wednesday, August 27, 2025

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

WEDNESDAY, AUGUST 27, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0504E
SUNSET:  1826E

A MIX OF CLOUDS AND SUN WITH SCATTERED SHOWERS POPPING UP….

Skies have been featuring a mix of clouds and sun through the
day, first with mid and upper level clouds early this morning.
Then more in the way of diurnal clouds as we pushed through the
late morning and early afternoon. A few showers have popped up
around the area as well, but so far none have reached the Hill.

Temperatures have warmed into the mid 70s after starting the
day in the mid 50s. Dew point values are quite comfortable for
this time of year with readings generally in the low 50s.

The wind is much lighter today than yesterday. It’s been mostly
out of a northwesterly direction averaging at around 8mph. The
peak gust for the day occurred back just before 2am with a
speed of 20mph.

Visibility is quite decent again today with a view of around
70 miles.

The maximum temperature so far today is 75F degrees, which is
4 degrees below the normal high of 79F. The minimum temperature
since midnight is 57 degrees, which is 4 degrees below the
normal low of 61F.

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Today’s Observations:

7 A.M.
Weather: Scattered altocumulus scattered altocumulus castellanus,
broken cirrus
Temperature: 61F; Dew Point: 51F; Relative Humidity: 69%
Wind: NNW @ 7 kts
Sea-level pressure: 1017.0 mb; 30.03 in. Hg: steady, then rising
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 57F
24-hr Precip: 0.00 inches
BHO SA 1155 75 SCT 100 SCT E250 BKN 70 170/61/51/3407/003/
8/084 53005 10061 20057

10 A.M.
Weather: Clear, few altocumulus/castellanus all quadrants, few
cirrus distant WNW-N-ENE
Temperature: 71F; Dew Point: 51F; Relative Humidity: 49%
Wind: NW @ 4 kts, wind light and variable
Sea-level pressure: 1016.7 mb; 30.02 in. Hg: rising, then falling
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 70 167/71/51/3104/002/ FEW AC/ACC ALQDS FEW CI DSNT
WNW-N-ENE WND L/V/ 8/081 58003

1 P.M.
Weather: Broken cumulus, broken altocumulus, cumulonimbus distant
W-N, towering cumulus all quadrants
Temperature: 70F Dew Point: 50F; Relative Humidity: 50%
Wind: WNW @ 9G15 kts
Sea-level pressure: 1015.9 mb; 30.00 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 75F
6-hr Min temp: 61F
6-hr Precip: 0.00 inches
BHO SA 1755 E55 BKN 75 BKN 70 159/70/50/2909G15/000/ CB DSNT W-N
TCU ALQDS VIRGA ALQDS/ 8/350 58008 10075 20061

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SUMMARY FOR TUESDAY, AUGUST 26, 2025

TEMPERATURE (DEGREES F)
MAX…….77   NORMAL…..79
MIN…….59   NORMAL…..61
MEAN……68   NORMAL…..70

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-2
TOTAL DEPARTURE FOR THE MONTH………………………-36 [-1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….16  DEPARTURE……..+9
TOTAL HEATING UNITS FOR THE SEASON……………17  DEPARTURE……..+2
TOTAL HEATING UNITS LAST SEASON TO DATE……….10  DEPARTURE……..+7

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..3  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH……………160  DEPARTURE…….-23
TOTAL COOLING UNITS FOR THE SEASON…………..671  DEPARTURE……+101
TOTAL COOLING UNITS LAST SEASON TO DATE………671  DEPARTURE………0

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)………..28 WNW  @   12:32 P.M.
VECTOR #1 (1-Sec)……….27 WNW  @   12:32 P.M.
VECTOR #2 (1-Sec)……….28 W    @   01:12 P.M.
DAVIS #1……………….27 W    @   12:32 P.M.
DAVIS #2 ………………27 W    @   01:38 P.M.
RMY #1 (Instantaneous)…..28 W    @   11:56 A.M.
RMY #2 (Instantaneous)…..29 W    @   01:12 P.M.
MERLIN…………………26 W
RICHARDS (C5C) (Inst)……27      @   12:32 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 WNW  @   12:33 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20      @   01:16 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20      @   12:32 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 W    @   01:17 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 W    @   12:32 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 W    @   01:16 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 WNW  @   12:32 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19      @   01:16 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.9 WNW [285 total miles] VECTOR #1………………11.8
VECTOR #2………………12.5
DAVIS #1……………….12.3 W
DAVIS #2……………….12.3 WNW
RMY #1…………………11.1 WNW
RMY #2…………………12.2 W
RICHARDS (C5C)………….11.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..1.82 DEPARTURE…..-1.50
TOTAL PRECIPITATION FOR THE YEAR (2025)…….31.27 DEPARTURE…..-2.75

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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/+7/0.68/426/51            35 NE  VEC1 34 NE  RMY 36 TSTM
8/15  75/63/69/-3/0.00/783/96            29 NE  VEC1 29 ENE RMY 31
8/16  86/62/74/+2/0.00/730/88            23 S   VEC1 24 S   RMY 23
8/17  89/64/77/+5/0.19/414/50            41 NE  VEC1 43 NE  RMY 42 TSTM
8/18  68/55/62/-9/0.00/627/76            32 NE  VEC1 34 NE  RMY 34
8/19  73/54/64/-7/0.00/560/68            20 SE  VEC1 19 SE  RMY 18
8/20  63/51/57-14/0.51/008/01            22 ENE VEC1 22 ENE RMY 21
8/21  67/54/61/-10/T/…/..              36 ENE VEC1 35 NE  RMY 36
8/22  79/53/66/-5/0.00/…/..            24 N   VEC1 25 N   RMY 25
8/23  85/60/73/+2/0.00/…/..            33 SSW VEC1 33 SSW RMY 35
8/24  80/60/70/-1/0.00/…/..            33 SSW VEC1 35 SSW RMY 34
8/25  83/63/73/+3/T/…/..               23 WSW VEC1 22 SW  RMY 23
8/26  77/59/68/-2/0.00/…/..            28 WNW VEC1 27 WNW RMY 28

8/27 The low since midnight is 57F, the daily normal low is 61F.

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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 27
HIGH 99F IN 1948
LOW 44F IN 1885
PRECIP 2.77 INCHES IN 1946
PEAK GUST 48 MPH NW IN 1983

RECORDS FOR AUGUST 28
HIGH 95F IN 1948
LOW 43F IN 1885
PRECIP 1.80 INCHES IN 1922
PEAK GUST 87 MPH SSE IN 1971 (DORIA)

TODAY’S REPORT PREPARED BY: MFD