Related Topics

Key

  ice in before November 1
  ice in Nov. 1 to Nov. 7
  ice in Nov. 8 to Nov. 14
  ice in Nov. 15 to Nov. 21
  ice in Nov. 22 to Nov. 28
  ice in Nov. 29 to December 5
  ice in Dec. 6 to Dec. 12
  ice in Dec. 13 to Dec. 19
  ice in after December 19
 

 

More Maps

Yearly Lake Ice In Maps:

Median Lake Ice In Map Earliest Lake Ice In Map Latest Lake Ice In Map

 

Notes

The map at left depicts historical median lake ice in dates using data archived by the DNR and the MPCA. Median is defined as the date where one half of the ice in dates were earlier, and one half of the ice in dates were later, than the presented date. To achieve lake-to-lake consistency, only 1950 - present dates were used to calculate the median. A marker is created for those lakes with ice in data whose period of record spans 20 or more years.

Hovering over the marker will cause the lake name and the median ice in date to be displayed. Clicking on the marker will produce an information window containing lake name, ice in summary statistics, and a link for obtaining all available historical ice in dates for the lake.

The map at left depicts the earliest lake ice in dates found in data archived by the DNR and the MPCA. A marker is created for those lakes with ice in data whose period of record spans 20 or more years.

Hovering over the marker will cause the lake name and the earliest ice in date to be displayed. Clicking on the marker will produce an information window containing lake name, ice in summary statistics, and a link for obtaining all available historical ice in dates for the lake.

The map at left depicts the latest lake ice in dates found in data archived by the DNR and the MPCA. A marker is created for those lakes with ice in data whose period of record spans 20 or more years.

Hovering over the marker will cause the lake name and the latest ice in date to be displayed. Clicking on the marker will produce an information window containing lake name, ice in summary statistics, and a link for obtaining all available historical ice in dates for the lake.

The map at left depicts lake ice in date reports received by the DNR and the MPCA for  . Hovering over the marker will cause the lake name and the ice in date to be displayed. Clicking on the marker will produce an information window containing lake name, ice in date, ice in summary statistics, and a link for obtaining all available historical ice in dates for the lake.

Definition of Lake Ice In

The definition of lake ice in varies from lake to lake, and individual to individual. Ideally, observers report the date when the entire lake is frozen over for the first time and the ice cover endures for the remainder of the winter.

Due to the variable definitions of this rather subjective observation, the participating agencies attempt to contact the same individuals each year to maintain a consistent record for a particular lake.

 

For more information contact: climate@umn.edu