Wednesday, August 20, 2025

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

WEDNESDAY, AUGUST 20, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0457E
SUNSET:  1837E

OVERCAST AND COOL WITH SCATTERED AREAS OF LIGHT RAIN….

clouds have been the theme today with periods of off and on
light rain. 0.02″ of rain has been recorded through 1pm, so
it has definitely been on the light side.

Temperatures are quite cool for this time of year with the
high only reaching the low 60s so far. This is more than
15 degrees below what would normally be expected on this
date.

The wind has mainly been on the light side today, although
there was a short period where it became a bit gusty early
this afternoon. It has been mainly out of an easterly direction
and averaging at around 7mph for the day so far. The peak gust
occurred just before noon-time and was registered at 22mph.

Visibility has been variable due to the rain moving through,
but has been mainly around 40 miles on average for the day.

The maximum temperature so far today is 63F degrees, which is
17 degrees below the normal high of 80F. The minimum temperature
since midnight is 57F degrees, which is 6 degrees below the
normal low of 63F.

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Today’s Observations:

7 A.M.
Weather: Broken altocumulus/castallanus, overcast altostratus,
few breaks in overcast distant E-SSW, few stratocumulus distant
ESE-SE
Temperature: 60F; Dew Point: 55F; Relative Humidity: 84%
Wind: E @ 6 kts, wind light
Sea-level pressure: 1022.6 mb; 30.20 in. Hg: rising, then falling
Visibility: 50 miles, 30 miles WNW-NW
6-hr Max temp: 60F
6-hr Min temp: 57F
24-hr Precip:  Trace
BHO SA 1155 E80 BKN 120 OVC 50 226/60/55/0806/020/ FEW BINOVC DSNT
E-SSW FEW SC DSNT ESE-S VSBY 30 WNW-NW WND LGT/ 8/52/ 50002 6000/
70000 10060 20057

10 A.M.
Weather: Overcast nimbotratus, very light rain, moderate cumulus
distant W-NE, few stratus fractus distant E-S-SSW
Temperature: 61F; Dew Point: 58F Relative Humidity: 91%
Wind: ENE @ 7 kts
Sea-level pressure: 1023.3 mb; 30.22 in. Hg: steady, then rising
Visibility: 40 miles, 20 miles SW-W
3-hr Precip: 0.02 inches
BHO SA 1455 E95 OVC 40R- 233/61/58/0707/022/ MDT CU DSNT W-NE
FEW STFRA DSNT E-S-SSW PCPN VRY LGT VSBY 20 SW-W/ 8/22/ 53007 6002/

1 P.M.
Weather: Overcast nimbostratus, few stratocumulus distant all
quadrants, virga distant WNW-NNW
Temperature: 63F Dew Point: 52F; Relative Humidity: 67%
Wind: E @ 10G16 kts
Sea-level pressure: 1022.0 mb; 30.18 in. Hg: falling, then more slowly
Visibility: 40 miles, 25 miles WNW-NNW
6-hr Max temp: 63F
6-hr Min temp: 59F
6-hr Precip:  0.02 inches
BHO SA 1755 E85 OVC 40 220/63/52/0810G16/018/ FEW SC DSNT ALQDS
VIRGA DSNT WNW-NNW VSBY 25 WNW-NNW/ 8/52/ 56013 6002/ 10063 20059

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SUMMARY FOR TUESDAY, AUGUST 19, 2025

TEMPERATURE (DEGREES F)
MAX…….73   NORMAL…..80
MIN…….54   NORMAL…..63
MEAN……64   NORMAL…..71

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-7
TOTAL DEPARTURE FOR THE MONTH……………………….-9 [-0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..1  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………..4  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE SEASON…………….5  DEPARTURE……..-7
TOTAL HEATING UNITS LAST SEASON TO DATE………..2  DEPARTURE……..+3

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……..-6
TOTAL COOLING UNITS FOR THE SEASON…………..646  DEPARTURE……+119
TOTAL COOLING UNITS LAST SEASON TO DATE………643  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)………..20 SE   @   09:42 P.M.
VECTOR #1 (1-Sec)……….19 SE   @   09:42 P.M.
VECTOR #2 (1-Sec)……….19 SE   @   07:48 P.M.
DAVIS #1……………….18 ESE  @   06:21 P.M.
DAVIS #2 ………………19 SE   @   07:44 P.M.
RMY #1 (Instantaneous)…..18 SE   @   06:21 P.M.
RMY #2 (Instantaneous)…..20 SE   @   09:41 P.M.
MERLIN…………………17 SE
RICHARDS (C5C) (Inst)……18      @   06:21 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 SE   @   09:22 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14      @   09:21 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15      @   09:41 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 E    @   04:41 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 SE   @   09:40 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..13 ENE  @   04:41 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 SE   @   09:41 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14      @   09:42 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.0 ESE [168 total miles] VECTOR #1……………….7.4
VECTOR #2……………….7.8
DAVIS #1………………..7.4 E
DAVIS #2………………….M
RMY #1………………….7.3 ENE
RMY #2………………….7.8 ENE
RICHARDS (C5C)…………..7.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..1.31 DEPARTURE…..-1.15
TOTAL PRECIPITATION FOR THE YEAR (2025)…….30.76 DEPARTURE…..-2.40

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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  73/54/64/-7/0.00/…/..            20 SE  VEC1 19 SE  RMY 18

8/20 The low since midnight is 57F, the daily normal low is 62F.

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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 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

RECORDS FOR AUGUST 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW IN 2004

TODAY’S REPORT PREPARED BY: MFD/AKJ