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Saturday, August 15, 2026

August 15, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, AUGUST 15, 2026 ALL TIMES ARE…

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

SATURDAY, AUGUST 15, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0451E
SUNSET:  1845E

LIGHT WINDS WITH BELOW AVERAGE TEMPERATURES TO ROUND OUT
A CALM MID-AUGUST SATURDAY….

Today started off with mostly clear conditions, though clouds
began to increase my mid morning. Fair weather cumulus and
cirrus clouds were observed with plenty of sunshine still, as
much of the day has been under partly cloudy conditions.

Temperatures dipped into the upper 50s here at Blue Hill early
this morning before rebounding into the upper 70’s by the 1pm
observation. This is just under seasonable, but after being well
above average for the month this is a nice change of pace. Dew
points have remained in the mid to upper 50’s throughout the day;
so another day of dry, comfortable air.

Winds were steady during the overnight with flow out of the north.
By early morning, winds have decreased quite a bit, becoming
variable at times. The average wind speed for the day so far is
around 7mph. The peak gust for the day so far is 19mph, which
occurred just after midnight this morning.

Visibility has held steady at 60 miles throughout the day. This
is quite a treat this time of year when higher humidity levels
usually impact visibility to under 40 miles.

The maximum temperature so far today is 78F, which is 3 degrees
below the normal high of 81F. The minimum temperature since
midnight is 59F, which is 4 degrees below the normal low of 63F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 66F; Dew Point: 56F; Relative Humidity: 71%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1021.7 mb; 30.17 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 66F
6-hr Min temp: 59F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 60 217/66/56/3405/017/ FEW CI ALQDS WND LGT/ 8/001
51010 10066 20059

10 A.M.
Weather: Scattered cirrocumulus, broken stratus, few cumulus E-SSW-NNW
Temperature: 75F; Dew Point: 57F; Relative Humidity: 53%
Wind: N @ 4 kts, wind light and variable
Sea-level pressure: 1021.5 mb; 30.16 in. Hg: falling, then rising
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 220 SCT E250 BKN 60 215/75/57/3504/016/ FEW CU E-SSW-NNW
WND L/V/ 8/209 55002

1 P.M.
Weather: Broken cumulus, broken cirrus
Temperature: 78F; Dew Point: 53F; Relative Humidity: 42%
Wind: WNW @ 6 kts, wind light
Sea-level pressure: 1021.5 mb; 30.16 in. Hg: rising, then falling
Visibility: 60 miles
6-hr Max temp: 78F
6-hr Min temp: 66F
6-hr Precip: 0.00 inches
BHO SA 1755 E60 BKN 250 BKN 60 215/78/53/2806/016/ WND LGT/ 8/201
50000 10078 20066

————————————————————–

SUMMARY FOR FRIDAY, AUGUST 14, 2026

TEMPERATURE (DEGREES F)
MAX…….83   NORMAL…..81
MIN…….62   NORMAL…..63
MEAN……73   NORMAL…..72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+1
TOTAL DEPARTURE FOR THE MONTH………………………+55 [+3.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH (AUG)………..0  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON…………….2  DEPARTURE……..-8
TOTAL HEATING UNITS LAST SEASON TO DATE………..2  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..8  DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH (AUG)………160  DEPARTURE…….+53
TOTAL COOLING UNITS FOR THE SEASON…………..657  DEPARTURE……+164
TOTAL COOLING UNITS LAST SEASON TO DATE………620  DEPARTURE…….+37

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 *=Last of multiple occurrences

F420C (Official)………..21 NW   @   02:11 P.M.
VECTOR #1 (1-Sec)……….21 NNW  @   01:53 P.M.
VECTOR #2 (1-Sec)……….22 WNW  @   12:29 P.M.
DAVIS #1……………….20 NW   @   04:42 A.M.
DAVIS #2 ………………19 WNW  @   12:30 P.M.
RMY #1 (Instantaneous)…..22 NW   @   02:11 P.M.
RMY #2 (Instantaneous)…..21 NNW  @   09:09 A.M.
MERLIN…………………20 NW
RICHARDS (C5C) (Inst)……21 NW   @   02:11 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 NNW  @   03:56 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 NNW  @   03:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 WNW  @   12:30 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 NW   @   03:56 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 WNW  @   12:31 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 NW   @   03:49 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 WNW  @   12:30 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 NW   @   03:49 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..8.5 NNW [205 total miles] VECTOR #1………………8.8
VECTOR #2………………9.2
DAVIS #1……………….8.8 NNW
DAVIS #2……………….8.2 NNW
RMY #1…………………8.8 NNW
RMY #2…………………9.0 NW
RICHARDS (C5C)………….9.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH (AUG)……..0.72 DEPARTURE…..-1.11
TOTAL PRECIPITATION FOR THE YEAR (2026)…….24.82 DEPARTURE…..-7.71

————————————————————–

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  87/64/76/+3/0.00/719/83             23 SSW VEC1 24 S   RMY 24
8/2  83/68/76/+3/0.01/406/47             29 S   VEC1 28 S   RMY 30
8/3  76/65/71/-2/0.70/121/14             44 SSW VEC1 44 SSW RMY 45 TSTM
8/4  85/61/73/0/0.00/860/100             18 W   VEC1 18 W   RMY 19
8/5  87/63/75/+2/0.00/694/81             21 W   VEC1 21 WSW RMY 20
8/6  91/68/80/+7/0.00/539/63             21 SW  VEC1 21 SW  RMY 22
8/7  92/73/83/+10/T/793/93               20 SW  VEC1 20 SW  RMY 21
8/8  90/70/80/+8/T/723/85                29 W   VEC1 29 WSW RMY 28
8/9  88/69/79/+7/0.00/…/..             28 W   VEC1 27 W   RMY 28
8/10 87/66/77/+5/0.00/…/..             24 W   VEC1 24 W   RMY 25
8/11 86/67/77/+5/0.00/…/..             26 WNW VEC1 26 WNW RMY 28
8/12 85/64/75/+3/T/…/..                18 W   VEC1 18 W   RMY 18
8/13 85/65/75/+3/0.01/…/..             26 WNW VEC1 25 WNW RMY 26
8/14 83/62/73/+1/0.00/…/..             21 NW  VEC1 21 NNW RMY 22

8/15 The low since midnight is 59F, the daily normal low is 63F.

————————————————————–

AUGUST DAILY RECORDS TO DATE

8/7 TIED RECORD HIGH MINIMUM TEMPERATURE OF 73F;
ALSO SET IN 2018 AND 2022

————————————————————–

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

RECORDS FOR AUGUST 15
HIGH 95F IN 1928
LOW 47F IN 1964
PRECIP 1.89 INCHES IN 2011
PEAK GUST 44e MPH S IN 1941, 44 MPH N IN 2024

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

TODAY’S REPORT PREPARED BY: Amanda Joly

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

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Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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