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June 2023 Summary – Cooler and Cloudier Than Average

July 1, 2023

Blue Hill Observatory June 2023 Summary:  June 2023 was cooler and cloudier than average with frequent precipitation, and it set a monthly…

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First ripe blueberry observed on the summit of Great Blue Hill on Tuesday, June 27, 2023. Photo provided by observer Amanda Joly.

Blue Hill Observatory June 2023 Summary: 

June 2023 was cooler and cloudier than average with frequent precipitation, and it set a monthly record for low wind speed. The approximated 24-hour mean temperature for the month of 63.7 deg F was 2.0 degrees cooler than the 1891-2020 130-year average for June, and it was 0.6 degrees cooler than the 1991-2020 30-year average. The average maximum temperature of 73,3 deg F was 2.1 degrees cooler than the 30-year normal, and the average minimum temperature of 56.2 deg F was 1.4 degrees cooler than the 30-year normal. After a warm start to the month, the June turned cooler, and only nine days reached 80F or higher, including the highest temperature of 91F on the 2nd, which was the first and so far only temperature of the year of 90F or higher. The coldest temperature was 43F on the 3rd and 4th. June precipitation was frequent and totaled 4.43 inches, which was 0.20 inches less than the 30-year normal. Nearly half of the June rainfall, 1.91 inches, fell in 24 hours during periods of heavy rain on the 17th-18th. This amount included 1.29 inches in three hours during the heaviest rain showers on the afternoon of the 17th. Measurable precipitation was recorded on 17 days, which was six more than average for June, and this number tied for the fifth most on record for the month. There were eight thunderstorm days during June, which was four more than average and the most since June 2008. The first ripe blueberry of the season was observed on the summit of Great Blue Hill on the 27th, six days later than average due to the cool weather and the same date as last year. The mean wind speed was 9.2 mph, which was a new record low monthly mean wind speed for June and for any month of the year. The prevailing wind direction was from the south-southwest. The highest wind gust was only 38 mph from the south on the 14th and from the south-southwest on the 27th. June bright sunshine was below average with 195.3 hours, or 44 percent of possible, which was eleven percent less than the long-term average for the month. 

BHO Lowest June Mean Wind Speed, mph (1885-2023):

1) 9.2 in 2023
2) 9.8 in 2009
   9.8 in 2020
4) 10.3 in 1895
5) 10.4 in 2022
6) 10.5 in 2019

BHO Lowest Monthly Mean Wind Speed, mph (1885-2023):

1) 9.2 in June 2023
2) 9.5 in August 1996
   9.5 in August 2008
   9.5 in August 2021
5) 9.6 in July 2019
6) 9.7 in July 2021
7) 9.8 in July 2012
   9.8 in June 2009
   9.8 in August 2019
   9.8 in June 2020
   9.8 in July 2020

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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