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Thursday, July 9, 2026

July 9, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, JULY 9, 2026 ALL TIMES ARE…

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

THURSDAY, JULY 9, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0416E
SUNSET:  1922E

ABOVE AVERAGE TEMPERATURES RETURN TO THE HILL…

Yesterday afternoon the wind direction shifted from the North

to the South. The northerly wind brought cooler temperatures

to the hill yesterday morning. After the wind shift we saw a

normal high of 82F, 1 degree above the normal. So far today the

wind direction has been coming steadily from the south bringing

above average temperatures to Great Blue Hill. So far we

recorded a high temperature of 91F, the record for today is

98F set in 1912.

Visibility was slightly obstructed today due to hazy conditions.

We saw a max visibility of 70 miles at the 10:00 AM observation.

Cloud cover increased in the afternoon and consisted of a mixture

of cumulus and cirrus during each observation with patches of

cirrocumulus later in the day

We saw a dramatic decrease in humidity throughout the day from
around 96% to 43%, as temperatures rose the dew point stayed
consistent around 65F. The low humidity made today’s heat feel
milder than some of the other above average temperature day’s
we have had this summer.

The maximum temperature so far today is 91F, which is 9 degrees
above the normal high of 82F. The minimum temperature since
midnight is 65F, which is 1 degrees above the normal low of 64F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Few cumulus SSE, scattered cirrus
Temperature: 73F; Dew Point: 64F; Relative Humidity: 73%
Wind: W @ 8 kts
Sea-level pressure: 1013.5 mb; 29.93 in. Hg: falling, then rising
Visibility: 60 miles, hazy
6-hr Max temp: 73F
6-hr Min temp: 65F
24-hr Precip: 0.00 inches
BHO SA 1155 250 SCT 60 134/73/64/2708/993/ FEW CU SSE HAZY/
8/101 53003 10073 20065

10 A.M.
Weather: Clear, few cumulus in all quadrants, few cirrus
ESE-N
Temperature: 85F; Dew Point: 66F; Relative Humidity: 68%
Wind: WSW @ 8 kts
Sea-level pressure: 1013.0 mb; 29.91 in. Hg: steady, then falling
Visibility: 70 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 70 129/85/66/2508/991/ FEW CU ALQDS FEW CI
ESE-N HAZY/ 8/209 58005

1 P.M.
Weather: Few cumulus in all quadrants, scattered cirrus
Temperature: 91F; Dew Point: 65F; Relative Humidity: 43%
Wind: SW @ 9 kts
Sea-level pressure: 1011.3 mb; 30.02 in. Hg: falling unsteadily
Visibility: 60 miles, hazy
6-hr Max temp: 91F
6-hr Min temp: 73F
6-hr Precip: 0.00 inches
BHO SA 1755 300 SCT 60 113/91/65/2309/986/ FEW CU ALQDS HAZY/
8/209 10091 20073
————————————————————–

SUMMARY FOR WEDNESDAY, JULY 8, 2026

TEMPERATURE (DEGREES F)
MAX…….83   NORMAL…..81
MIN…….58   NORMAL…..63
MEAN……72   NORMAL…..72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-1
TOTAL DEPARTURE FOR THE MONTH………………………+43 [+5.4 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 (JUL)………..2  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE SEASON…………….2  DEPARTURE……..-1
TOTAL HEATING UNITS LAST SEASON TO DATE………..0  DEPARTURE……..+2

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..6  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH (JUL)……….99  DEPARTURE…….+42
TOTAL COOLING UNITS FOR THE SEASON…………..338  DEPARTURE……+142
TOTAL COOLING UNITS LAST SEASON TO DATE………293  DEPARTURE…….+45

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)………..26 N    @   12:16 A.M.
VECTOR #1 (1-Sec)……….26 N    @   12:16 A.M.
VECTOR #2 (1-Sec)……….24 N    @   12:01 A.M.
DAVIS #1……………….23 N    @   12:16 A.M.
DAVIS #2 ………………20 N    @   12:11 A.M.
RMY #1 (Instantaneous)…..25 N    @   12:16 A.M.
RMY #2 (Instantaneous)…..24 N    @   12:01 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……23 N    @   12:16 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 N    @   12:04 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 N    @   12:17 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 N    @   12:16 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 N    @   08:49 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 NNE  @   12:17 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 N    @   12:15 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 N    @   12:16 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 N    @   12:15 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.8 NE [188 total miles] VECTOR #1……………….8.7
VECTOR #2……………….8.9
DAVIS #1………………..8.6 N
DAVIS #2………………..8.4 N
RMY #1………………….8.5 NNW
RMY #2………………….8.7 NNW
RICHARDS (C5C)…………..8.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE MONTH (JUL)……..2.22 DEPARTURE…..+1.35
TOTAL PRECIPITATION FOR THE YEAR (2026)…….20.88 DEPARTURE…..-7.22

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/1  95/68/82/+11/0.00/…/..            23 WSW VEC1 23 SW  RMY 24
7/2  99/72/86/+15/0.04/…/..            40 W   VEC1 39 W   RMY 45 TSTM
7/3  98/77/88/+16/0.00/…/..            32 WNW VEC1 32 WNW RMY 34 TSTM
7/4  94/73/84/+12/0.01/…/..            29 WNW VEC1 29 WNW RMY 29
7/5  83/69/76/+4/T/…/..                20 SSE VEC1 20 SE  RMY 17
7/6  74/60/67/-5/0.05/…/..             24 E   VEC1 24 E   RMY 24
7/7  65/61/63/-9/2.11/…/..             40 ENE VEC1 39 NE  RMY 40
7/8  83/58/72/-1/0.00/…/..             26 N   VEC1 26 N   RMY 25

7/9 The low since midnight is 65F, the daily normal low is 63F.

————————————————————–

JULY DAILY RECORDS TO DATE

7/2 RECORD HIGH MAXIMUM TEMPERATURE OF 99F,
BEATING THE PREVIOUS RECORD OF 95F SET IN 1963

7/2 RECORD HIGH MINIMUM TEMPERATURE OF 72F,
THIS TIED THE RECORD WITH 1901, 1913, AND 1963

7/3 RECORD HIGH MINIMUM TEMPERATURE OF 77F,
BEATING THE PREVIOUS RECORD OF 76F SET IN 2002

————————————————————–

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

RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992

RECORDS FOR JULY 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 3.85 INS IN 2025
WIND 75 MPH W IN 1985

TODAY’S REPORT PREPARED BY: Kaitlin A. Geagan

 

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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
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