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Friday, July 17, 2026

July 17, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, JULY 17, 2026 ALL TIMES ARE…

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

FRIDAY, JULY 17, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0423E
SUNSET:  1918E

SEASONABLE TEMPERATURES WITH A COOLER NORTHWEST FLOW TO START
THE WEEKEND…

The day started with scattered cirrus and plenty of sunshine.
Temperatures started off on the cooler side and was a refreshing
start to the day. By mid morning, skies were mostly cloudy before
returning to scattered conditions again by 1pm. There has been a
smoke layer in the sky, but it is aloft and hasn’t been impacting
air quality. It has been an exceptional day with seasonal temps,
a cool breeze and comfortable dew points.

Temperatures were down to the low 60’s during the early morning
hours which was quite refreshing. As the day continued, the
temperatures rose into the low 80’s which is seasonable for this
time of year. Dew points have considerably lower since yesterday
with readings in the low to mid 50’s. This is a very comfortable
range for July.

Winds were out of the northwest in the earlier part of the day
before shifting to a west-northwest flow by mid morning. The average
speed for the day so far is around 12mph. The peak gust so far for
the day is 27mph, which occurred just before 8am this morning.

There was a slight improvement to the visibility today, with views
around 40 miles throughout the day.

The maximum temperature so far today is 81F, which is 1 degree
below the normal high of 82F. The minimum temperature since
midnight is 61F, which is 3 degrees below the normal low of 64F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, thin smoke layer aloft all quadrants
Temperature: 67F; Dew Point: 54F; Relative Humidity: 61%
Wind: NW @ 8 kts
Sea-level pressure: 1016.4 mb; 30.01 in. Hg: rising, then more slowly
Visibility: 40 miles
6-hr Max temp: 67F
6-hr Min temp: 61F
24-hr Precip: 0.00 inches
BHO SA 1155 250 SCT 40 164/67/54/3108/001/ THN K LYR ALF ALQDS/
8/001 51016 10067 20061

10 A.M.
Weather: Broken cirrostratus/cirrus, thin smoke layer aloft
all quadrants
Temperature: 75F; Dew Point: 50F; Relative Humidity: 41%
Wind: WNW @ 9 kts
Sea-level pressure: 1016.7 mb; 30.02 in. Hg: rising unsteadily
Visibility: 40 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E220 BKN 40 167/75/50/3009/002/ THN K LYR ALF ALQDS/
8/009 52003

1 P.M.
Weather: Scattered cirrus/cirrostratus, thin smoke layer aloft
all quadrants
Temperature: 81F; Dew Point: 54F; Relative Humidity: 39%
Wind: WNW @ 8 kts
Sea-level pressure: 1016.4 mb; 30.01 in. Hg: rising, then falling
Visibility: 40 miles
6-hr Max temp: 81F
6-hr Min temp: 67F
6-hr Precip: 0.00 inches
BHO SA 1755 220 SCT 40 164/81/54/3008/001/ THN K LYR ALF ALQDS/
8/009 58003 10081 20067

————————————————————–

SUMMARY FOR THURSDAY, JULY 16, 2026

TEMPERATURE (DEGREES F)
MAX…….86   NORMAL…..82
MIN…….63   NORMAL…..64
MEAN……75   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+2
TOTAL DEPARTURE FOR THE MONTH………………………+63 [+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 (JUL)………..2  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON…………….2  DEPARTURE……..-2
TOTAL HEATING UNITS LAST SEASON TO DATE………..1  DEPARTURE……..+1

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY…………….10  DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH (JUL)………183  DEPARTURE…….+61
TOTAL COOLING UNITS FOR THE SEASON…………..422  DEPARTURE……+161
TOTAL COOLING UNITS LAST SEASON TO DATE………364  DEPARTURE…….+58

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)………..33 W    @   04:14 P.M.
VECTOR #1 (1-Sec)……….34 NNW  @   05:35 P.M.
VECTOR #2 (1-Sec)……….35 NNW  @   05:51 P.M.
DAVIS #1……………….34 W    @   04:13 P.M.
DAVIS #2 ………………31 N    @   05:51 P.M.
RMY #1 (Instantaneous)…..33 NNW  @   05:35 P.M.
RMY #2 (Instantaneous)…..36 W    @   04:12 P.M.
MERLIN…………………34 W
RICHARDS (C5C) (Inst)……33 N    @   05:51 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 W    @   04:14 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..24 W    @   04:14 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24 W    @   04:14 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 W    @   04:13 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 N    @   06:01 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 W    @   04:14 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 W    @   04:14 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23 W    @   04:14 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.8 W [283 total miles] VECTOR #1………………11.8
VECTOR #2………………12.2
DAVIS #1……………….12.1 WNW
DAVIS #2……………….M
RMY #1…………………11.5 WNW
RMY #2…………………11.8 W
RICHARDS (C5C)………….11.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH (JUL)……..2.22 DEPARTURE…..+0.43
TOTAL PRECIPITATION FOR THE YEAR (2026)…….20.88 DEPARTURE…..-8.14

————————————————————–

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/+11/0.00/704/77            23 WSW VEC1 23 SW  RMY 24
7/2  99/72/86/+15/0.04/822/90            40 W   VEC1 39 W   RMY 45 TSTM
7/3  98/77/88/+16/0.00/803/88            32 WNW VEC1 32 WNW RMY 34 TSTM
7/4  94/73/84/+12/0.01/765/84            29 WNW VEC1 29 WNW RMY 29
7/5  83/69/76/+4/T/355/39                20 SSE VEC1 20 SE  RMY 17
7/6  74/60/67/-5/0.05/009/01             24 E   VEC1 24 E   RMY 24
7/7  65/61/63/-9/2.11/000/00             40 ENE VEC1 39 NE  RMY 40
7/8  83/58/72/-1/0.01/780/86             26 N   VEC1 26 N   RMY 25
7/9  91/65/78/+5/0.00/834/92             29 SW  VEC1 27 SW  RMY 29
7/10 88/69/79/+6/0.00/724/80             21 NE  VEC1 21 NE  RMY 23
7/11 82/66/74/+1/0.00/795/88             20 E   VEC1 20 E   RMY 19
7/12 81/61/71/-2/0.00/884/98             18 ENE VEC1 18 ENE RMY 18
7/13 86/62/74/+1/0.00/…/..             30 SW  VEC1 30 SSW RMY 32
7/14 88/67/78/+5/0.00/…/..             32 WSW VEC1 32 WSW RMY 34
7/15 82/67/75/+2/0.00/…/..             33 WNW VEC1 33 WNW RMY 33
7/16 86/63/75/+2/0.00/…/..             33 W   VEC1 34 NNW RMY 33

7/17 The low since midnight is 61F, the daily normal low is 64F.

————————————————————–

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 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971

RECORDS FOR JULY 18
HIGH 96F IN 1991, 1999
LOW 54F IN 1892, 1956, 1971
PRECIP 1.65 INS IN 2000
WIND 43e MPH SW IN 1949

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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All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

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§ 03

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§ 04

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§ 05

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§ 06

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§ 08

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§ 13

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