Sign In Become a Member
Donate
Daily Discussions

Tuesday, July 15, 2025

July 15, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, JULY 15, 2025 ALL TIMES ARE…

Agreement required — click “Accept & Continue” below to review and accept the Data Use & Privacy Policy

Access to this content requires acceptance of our Data Use & Privacy Policy.

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

TUESDAY, JULY 15, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0421E
SUNSET:  1919E

EARLY FOG BURNS OFF TO MAINLY SUNNY SKIES WITH HOT AND HUMID
CONDITIONS….

We started the day once again with low clouds and fog following
some light rain showers that moved through overnight. The showers
only left 0.06″ of rain, but it’s adding to what has turned into
a very wet month.

The clouds and fog burned off quickly leaving us with mainly
sunny skies through the balance of the day so far. Hot and humid
conditions are impacting the area with heat index values pushing
into the mid 90s. A heat advisory is in effect for the high heat
index values of 96F or higher.

Temperatures have warmed to near 90 early this afternoon with dew
point values hanging in the low to mid 70s. As such, it’s rather
oppressive out there again today, combining with the heat.

To make matters worse, the wind has been on the light side since
early this morning. A mostly west-southwest to southwest wind has
been averaging at around 8mph for the day so far. The peak gust
for the day so far is 20mph, which occurred right before 3am this
morning.

The fog lifted very early this morning, so we’ve observed 30-40
miles of visibility for all of our observations today. Conditions
are hazy as one would expect with such high humidity levels.

The maximum temperature so far today is 89F degrees, which is
7 degrees above the normal high of 82F. The minimum temperature
since midnight is 71F degrees, which is 7 degrees above the normal
low of 64F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken stratus fractus, overcast altocumulus
Temperature: 73F; Dew Point: 72F; Relative Humidity: 98%
Wind: SW @ 6 kts, wind light
Sea-level pressure: 1019.4 mb; 30.10 in. Hg: rising steadily
Visibility: 30 miles, 8 miles E, 15 miles SSE-SSW, thin fog
6-hr Max temp: 73F
6-hr Min temp: 71F
24-hr Precip:  0.06 inches
BHO SA 1155 E1 BKN 75 OVC 30 194/73/72/2306/010/ STFRA DRFTG OVR SMT
THN F ALQDS VSBY 8 E 15 SSE-SSW WND LGT/ 8/65/ 52006 6006/ 70006
10073 20071

10 A.M.
Weather: Scattered cumulus, scattered altocumulus, scattered dense
cirrus
Temperature: 82F; Dew Point: 72F; Relative Humidity: 72%
Wind: WSW @ 4 kts, wind light
Sea-level pressure: 1019.0 mb; 30.09 in. Hg: steady, then falling
Visibility: 35 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 22 SCT 85 SCT 250 SCT 35 190/82/72/2504/009/ HAZY
WND LGT/ 8/252 58004

1 P.M.
Weather: Broken cumulus, broken cirrus
Temperature: 88F Dew Point: 72F; Relative Humidity: 59%
Wind: W @ 3 kts, wind light
Sea-level pressure: 1017.7 mb; 30.05 in. Hg: falling, then more slowly
Visibility: 35 miles, hazy
6-hr Max temp: 89F
6-hr Min temp: 73F
6-hr Precip:  0.00 inches
BHO SA 1755 E42 BKN 250 BKN 35 177/88/72/2703/005/ HAZY WND LGT/
8/202 56013 10089 20073

————————————————————–

SUMMARY FOR MONDAY, JULY 14, 2025

TEMPERATURE (DEGREES F)
MAX…….81   NORMAL…..82
MIN…….65   NORMAL…..64
MEAN……73   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………..0
TOTAL DEPARTURE FOR THE MONTH………………………+28 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH……………..1  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON…………….1  DEPARTURE……..-3
TOTAL HEATING UNITS LAST SEASON TO DATE………..0  DEPARTURE……..+1

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..8  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………131  DEPARTURE…….+26
TOTAL COOLING UNITS FOR THE SEASON…………..331  DEPARTURE…….+87
TOTAL COOLING UNITS LAST SEASON TO DATE………337  DEPARTURE……..-6

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)……….E23 SW   @   04:32 P.M.
VECTOR #1 (1-Sec)……….23 SW   @   04:32 P.M.
VECTOR #2 (1-Sec)……….25 SW   @   04:38 P.M.
DAVIS #1……………….22 S    @   04:19 P.M.
DAVIS #2 ………………24 S    @   04:16 P.M.
RMY #1 (Instantaneous)…..25 SSW  @   05:20 P.M.
RMY #2 (Instantaneous)…..25 SW   @   04:38 P.M.
MERLIN…………………22 SW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 SSW  @   04:37 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17      @   04:33 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18      @   04:33 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 S    @   04:40 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 SSW  @   04:33 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 SSW  @   04:33 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 SW   @   04:33 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.2 SSW [221 total miles] VECTOR #1……………….9.6
VECTOR #2………………10.1
DAVIS #1………………..9.1 SSW
DAVIS #2……………….10.0 SSW
RMY #1………………….9.4 SSW
RMY #2…………………10.2 SSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.06 DEPARTURE…..-0.05
TOTAL PRECIPITATION FOR THE MONTH…………..5.20 DEPARTURE…..+3.64
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.43 DEPARTURE…..-0.36

————————————————————–

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   90/68/79/+8/0.14/411/45           38 W   VEC1 38 W   RMY 41 TSTM
7/2   85/69/77/+6/0.02/247/27           23 WSW VEC1 24 WSW RMY 24
7/3   88/63/76/+4/0.03/748/82           39 SW  VEC1 39 SW  RMY 40 TSTM
7/4   80/60/70/-2/0.00/875/96           28 NNW VEC1 27 NNW RMY 29
7/5   83/61/72/0/0.00/664/73            23 W   VEC1 23 W   RMY 24
7/6   92/65/79/+7/0.00/818/90           29 SW  VEC1 29 SW  RMY 29
7/7   88/69/79/+7/0.01/490/54           28 SSW VEC1 28 SSW RMY 29 TSTM
7/8   94/67/81/+9/0.36/562/62           24 WSW VEC1 24 WSW RMY 27 TSTM
7/9   74/65/70/-3/0.73/172/19           26 SW  VEC1 27 SW  RMY 28 TSTM
7/10  66/61/64/-9/3.85/…/..           24 ENE VEC1 24 ENE RMY 24 TSTM
7/11  80/62/71/-2/0.00/…/..           18 SSW VEC1 18 SSW RMY 18
7/12  84/65/75/+2/0.00/…/..           20 S   VEC1 20 S   RMY 19
7/13  85/63/74/+1/0.00/…/..           21 SSW VEC1 21 SSW RMY 21
7/14  81/65/73/0/T/…/..               23 SW  VEC1 23 SW  RMY 25

7/15 The low since midnight is 71F, the daily normal low is 64F.

————————————————————–

JULY DAILY RECORDS TO DATE

7/10 RECORD HIGHEST PRECIPITATION OF 3.85 INCHES;
BEATING OLD RECORD OF 1.95 INCHES SET IN 2015

————————————————————–

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

RECORDS FOR JULY 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002

RECORDS FOR JULY 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1903
PRECIP 2.56 INS IN 2023
WIND 48e MPH SW 1944

TODAY’S REPORT PREPARED BY: MFD

Please follow and like us:
error
fb-share-icon
Tweet
fb-share-icon
←
→
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

Ownership and Proprietary Rights

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

Governing Law and Jurisdiction

This Policy shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflict of law provisions. For interactions with international users, this Policy shall apply to the maximum extent permitted by applicable local law.

Any dispute arising from or related to this Policy shall be subject to the exclusive jurisdiction of the state and federal courts located in Norfolk County, Massachusetts. By accessing Observatory data, all users consent to personal jurisdiction in Massachusetts and waive any objection to the venue or inconvenience of such forum.

§ 03

Permitted Uses

Observatory data are made available for the following limited, non-commercial purposes only:

  • Personal study and analysis
  • Educational classroom use
  • Student projects
  • Non-commercial academic research
  • Publication of analyses, figures, models, or conclusions derived from the data, subject to the attribution requirements of Section 4

All other uses require prior written authorization from the Observatory.

§ 04

Attribution Requirement

Any use of Observatory data in any published, presented, or publicly distributed work must include the following verbatim acknowledgment:

“Data provided by the Blue Hill Observatory & Science Center, Milton, Massachusetts. Continuous weather observations since 1885.”

Failure to include proper attribution is a material violation of this Policy.

§ 05

Prohibited Uses

Unless explicitly authorized in writing, Users may not:

  • Resell, license, sublicense, or commercially exploit Observatory data in any form
  • Redistribute the dataset in whole or in part to any third party
  • Publish the dataset for download by third parties
  • Host, mirror, or archive the dataset on any external website, repository, or storage service
  • Upload the dataset to any public or institutional data repository
  • Provide the data through APIs, automated services, or subscription platforms
  • Incorporate the data into any commercial product, software, application, or service
  • Use the data for AI or machine learning systems intended for commercial use or external distribution
  • Use the data to create derivative datasets that enable reconstruction of the underlying observations
§ 06

Commercial Licensing

Organizations seeking to use Observatory data for commercial purposes must obtain a license prior to any such use. Licensing inquiries: data@bluehill.org.

§ 07

Automated Access

Automated scraping, bulk harvesting, or systematic downloading of Observatory data is strictly prohibited without prior written authorization.

§ 08

Enforcement and Remedies

Violation of this Policy may result in immediate revocation of data access, pursuit of legal remedies available under United States law, and referral to applicable authorities. The Observatory reserves all rights to seek injunctive relief, damages, and attorneys’ fees in connection with any unauthorized use of its data.

Part II — Privacy Policy
§ 09–10

Scope & Information Collected

This section governs the collection, use, storage, and disclosure of personal information from visitors to the Blue Hill Observatory website and users of its data services. The Observatory may collect contact information (name, email, organization) when voluntarily submitted, usage data including IP addresses and pages visited, and data download records.

§ 11–12

How We Use Information & Retention

Information is used solely for: responding to inquiries and licensing requests; monitoring and enforcing compliance with this Policy; improving website performance; and communicating Observatory news to opted-in users. The Observatory does not sell, rent, or share personal information with third parties for marketing purposes. Data access records may be retained indefinitely for compliance and enforcement purposes.

§ 13

International Users and Data Transfers

The Observatory is located in the United States. International users acknowledge their information will be processed in the United States under U.S. law. Users requiring specific data processing agreements under non-US law must contact data@bluehill.org before accessing data.

§ 14–16

Cookies, Security & Children’s Privacy

The Observatory website may use cookies for analytics and functionality. By continuing to use the site, users consent to cookie use. The Observatory implements reasonable measures to protect personal information but cannot guarantee absolute security. Observatory data services are not directed at children under 13.

Part III — General Provisions
§ 17–20

Modifications, Severability, Entire Agreement & Contact

The Observatory reserves the right to modify this Policy at any time. Updated versions will be posted at bluehill.org. Continued use of Observatory data following any modification constitutes acceptance of the revised Policy. This Policy constitutes the entire agreement between the User and the Observatory. Questions and licensing inquiries: Blue Hill Observatory & Science Center, Milton, Massachusetts — data@bluehill.org

By accessing, downloading, or using any Blue Hill Observatory data or services, you acknowledge that you have read, understood, and agree to be bound by this Policy.
Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
↓ Scroll to read the full Policy — the agreement checkbox will unlock at the bottom