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Weather Summary Archives

November 2023 Summary – Sixth Sunniest on Record

December 3, 2023

Blue Hill Observatory November 2023 Summary:  November was cooler and drier than average with much more sunshine than expected. The approximated 24-hour…

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Blue Hill Observatory November 2023 Summary: 

November was cooler and drier than average with much more sunshine than expected. The approximated 24-hour mean temperature for the month of 39.7 deg F was 1.0 degree cooler than the 1891-2020 130-year average for November, and it was 2.4 degrees cooler than the 1991-2020 30-year average. The average maximum temperature of 48.5 deg F was 1.6 degrees cooler than the 30-year normal, and the average minimum temperature of 31.8 deg F was 2.0 degrees cooler than the 30-year normal. The warmest day reached 65F on the 7th, and the lowest temperature was 20F on the 25th. The total precipitation was 2.18 inches, which was 2.13 inches less than the 30-year normal. More than half of the monthly rainfall, 1.25 inches, fell within 24 hours on the 21st-22nd, and there were only eight days with measurable precipitation. A trace of frozen precipitation was observed on several days, and the total trace was 1.8 inches below normal for November. There were no thunderstorm days during the month, which was typical for the month. The mean wind speed was 11.3 mph, which was the lowest on record for November, and the prevailing wind direction was from the northwest. The highest wind gust was 46 mph from the southeast during the rainfall on the 27th. November sunshine was much above average with 174.5 hours of bright sunshine, or 62 percent of possible, which was fourteen percent more than the long-term average for the month, and November was the sixth sunniest on record.

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

1) 11.3 in 2023
2) 11.7 in 2021
3) 11.9 in 2016
4) 12.1 in 1992
    12.1 in 2000
6) 12.3 in 2012

BHO Highest November Sunshine, hours (1886-2023):

1) 174.5 in 2021 (67%)
2) 182.3 in 1939 (64%)
3) 181.5 in 1917 (64%)
4) 181.4 in 1976 (64%)
5) 178.5 in 2022 (63%)
6) 174.5 in 2023 (62%)
7) 173.9 in 1905 (61%)

Blue Hill Observatory Fall (September-November) 2023 Summary: 

The fall season was generally warm with less precipitation and more sunshine than expected. The approximated 24-hour mean temperature for the season of 53.5 deg F was 2.4 degree warmer than the 1891-2020 130-year average for the season. The average maximum temperature for fall of 63.2 deg F was 2.0 degrees warmer than the 30-year normal. The average minimum temperature of 46.5 deg F was 2.0 degrees warmer than the 30-year normal, and it tied as the eighth warmest on record. Daily fall temperatures ranged from a high of 92F on September 7th to a low of 20F on November 25th. The total precipitation for fall was 10.92 inches, which was 2.94 inches less than the 30-year normal. The greatest rainfall in 24 hours was 1.92 inches on September 13th, and rainfall during September included the effects of both Hurricane Lee and Tropical Storm Ophelia as they passed offshore. The mean wind speed for fall was 10.4 mph, which was the lowest on record for the season. The highest wind gust during fall was only 46 mph from the southeast on November 27th. After a less sunny than average September and a near average October, a very sunny November compensated so that fall sunshine was above average with 551.4 hours, or 57 percent of the possible bright sunshine, which was three percent more than the long-term average.

BHO Highest Fall Average Minimum Temperature, deg F (1885-2023):

1) 48.2 in 2011
2) 47.3 in 2017
3) 46.9 in 1931
4) 46.8 in 2021
5) 46.7 in 2005
   46.7 in 2015
7) 46.6 in 1946
8) 46.5 in 1961
   46.5 in 2016
   46.5 in 2023

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

1) 10.4 in 2023
2) 11.4 in 2021
3) 11.6 in 2016
4) 11.7 in 2022
5) 11.8 in 2018

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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