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July 2018 Summary – Eighth Warmest and Eighth Sunniest on Record

August 4, 2018

Blue Hill Observatory July 2018 Summary: July was much warmer and sunnier than average with near normal precipitation. The 24-hour adjusted mean…

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Blue Hill Observatory

July 2018 Summary:

July was much warmer and sunnier than average with near normal precipitation. The 24-hour adjusted mean temperature for the month of 73.6 deg F was 3.9 degrees warmer than the 120-year average for July and about three degrees warmer than the 1981-2010 30-year average. This mean temperature was the eighth warmest on record for July and the warmest only since 2016. The average maximum temperatures for July of 83.9 deg F tied for the ninth warmest on record. There were five ninety-degree days, which is two more than average, and the yearly total is up to seven, which is three more than average through July. The highest temperature for the month was 94F on the 1st and 3rd, and the lowest temperature was 54F on the 7th. A total of 3.84 inches of precipitation was measured, which was slightly more than the long-term 120-year average and slightly less than the 30-year mean. About one-third of the monthly total, 1.36 inches, was the greatest amount to fall in 24 hours on the 17th-18th, and about one inch of this amount occurred in a single hour during a strong thunderstorm on the afternoon of the 17th. There were five thunderstorm days during July, average for the month, which brought the annual total up to 11. The mean wind speed was 10.4 mph, and the prevailing direction was from the south. A peak gust of 41 mph from the south-southwest occurred on the 26th. July was much sunnier than average with a total of 310.7 hours of bright sunshine, or 70 percent of possible, which was 12 percent more than the long-term mean, making July the eighth sunniest on record.

BHO Warmest July Mean Temperature (24-hr adjusted mean), deg F (1885-2018):

1)  75.1 in 2010
2)  74.9 in 1952
3)  74.1 in 1994
   74.1 in 2013
5)  74.0 in 2011
   74.0 in 2016
7)  73.8 in 1999
8)  73.6 in 2018
9)  73.5 in 1949
10) 73.2 in 2012

BHO Warmest July Average Maximum Temperature, deg F (1885-2018):

1)  87.2 in 1952
2)  86.5 in 2010
3)  85.5 in 1949
4) 84.9 in 1994
5)  84.7 in 2016
6) 84.5 in 1911
7)  84.4 in 1983
8)  84.3 in 1999
9)  83.9 in 1955
   83.9 in 1995
   83.9 in 2018

BHO Greatest July Sunshine, hours [percent] (1885-2018):

1)  331.6 in 1952   [75%] 2)  326.4 in 1966   [73%] 3) 317.3 in 1899   [71%] 4)  317.0 in 1909   [71%] 5)  316.4 in 2001   [71%] 6) 314.0 in 1893   [71%] 7)  313.6 in 1968   [71%] 8) 310.7 in 2018   [70%] 9) 309.3 in 1900   [70%] 10) 306.8 in 1892   [69%]

BHO Greatest July Water Vapor Pressure, mb (1932-2018):

1) 23.5 in 2013
2) 22.5 in 1994
3) 21.7 in 2006
4) 21.3 in 1988
5) 21.2 in 1955
   21.2 in 1975
7) 21.0 in 1967
8) 20.8 in 2018
9) 20.7 in 2008

 

Mike Iacono
Chief Scientist
Blue Hill Observatory

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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

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
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