skip to main content


Great Lakes Ice Cover Data Set and Climatology Introduction Original Ice Charts First Ice, Last Ice and Ice Duration Daily Ice Cover Time Series Weekly Ice Cover Statistics Questions / Contact GLERL home  

Privacy and Security Notice

* This Privacy and Security Notice pertains to the online version of the NOAA Great Lakes Ice Atlas.

1. These web pages are provided as a public service by the Great Lakes Environmental Research Laboratory.

2. For site management, information is collected for statistical purposes. This government computer system uses software programs to create summary statistics, which are used for such purposes as assessing what information is of most and least interest, determining technical design specifications, and identifying system performance or problem areas.

3. For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage.

4. Except for authorized law enforcement investigations, no other attempts are made to identify individual users or their usage habits. This web site does not use cookies. Raw data logs are used for no other purposes and are scheduled for regular destruction in accordance with National Archives and Records Administration [General Schedule 20].

5. Unauthorized attempts to upload information or change information on this service are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act.

6. If you have any questions or comments about the information presented here, please forward them to


Accessibility Notice

These pages have been reviewed and revised to be accessible to individuals with disabilities in accordance with Section 508 of the Workforce Investment Act and the Americans with Disabilities Act. If you have difficulty accessing information or using adaptive technology with any of these pages, please contact us:

For Adobe® PDF documents, Adobe® offers conversion tools for the visually impaired at


Introduction | Original Ice Charts | First Ice, Last Ice & Ice Duration | Daily Ice Cover Time Series
Weekly Ice Cover Statistics | Contact

US Department of Commerce | NOAA | OAR | GLERL
Privacy Notice | Accessibility Notice