Sign In Become a Member
Donate
Weather Summary Archives

September 2017 Summary – Eighth Warmest on Record

October 4, 2017

Blue Hill Observatory September 2017 Summary: September was notable for being generally warm, and it was drier than normal until the last…

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 Observatory

September 2017 Summary:

September was notable for being generally warm, and it was drier than normal until the last day of the month. The 24-hour mean temperature for the month of 65.1 deg F was 3.9 degrees warmer than the 120-year average for September and 3.0 degrees warmer than the 1981-2010 30-year average. September was the eighth warmest on record and the warmest since a mean of 65.2 deg F in 2016. The high temperature of 86F occurred on the 25th and 27th during several days of very warm and humid weather the last week of the month, and the reading on the 27th set a new record for the date surpassing the previous record of 84F set in 1998 and 2014. The coldest temperature during September was 44F on the 30th following very heavy rain that day. A total of 5.50 inches of precipitation was measured during September, which was about one and a half inches more than the long-term 120-year average and the 30-year mean. The greatest amount in 24 hours was 2.33 inches (almost half of the monthly total) during strong thunderstorms on the 30th that also brought small hail to the Observatory. This was the last of four thunderstorm days during September, which brought the annual total up to 17. Through September, there has been at least one thunderstorm day observed in each month so far this year, which has only happened once before (in 1996) during the entire Blue Hill climate record. The mean wind speed for September was 10.8 mph, which was the fifth lowest on record for the month, and the prevailing direction was from the north-northeast. Hurricane Jose approached New England from the south on the 19th-20th and then lingered offshore for several days as it brought a total of 1.60 inches of rainfall from the 18th to 23rd. This storm also brought the peak wind gust for the month of 47 mph from the north-northeast on the 21st. September bright sunshine was close to average with 200.6 hours, or 56 percent of possible, which was one percent less than the long term mean.

BHO Warmest September 24-Hour Mean Temperature, deg F (1885-2017):

1) 67.2 in 2015
2) 66.1 in 1961
3) 65.5 in 2005
4) 65.4 in 1999
65.4 in 2010
6) 65.3 in 1930
7) 65.2 in 2016
8) 65.1 in 2017
9) 65.0 in 2002
10) 64.9 in 1983

BHO Lowest September Mean Wind Speed, mph (1885-2017):

1) 10.5 in 2014
2) 10.6 in 2013
3) 10.7 in 2011
   10.7 in 2015
5) 10.8 in 2017
6) 10.9 in 1917
   10.9 in 2003

 

 

Mike Iacono
Chief Scientist
Blue Hill Observatory

 

facebookShare on Facebook
TwitterPost on X
FollowFollow us
PinterestSave
←
→
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
Main Menu