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While there is significant year-to-year variability in ice coverage, trends show that annual maximum ice coverage on each of the Great Lakes has declined over time. Across all the Great Lakes, the annual maximum ice cover is, on average, 22% lower than it was a half-century ago. Furthermore, ice coverage is becoming less reliable, with more frequent years of extremely low ice coverage (like this year).
The decline in lake ice coverage is driven by warming air and water temperatures due to climate change. The lake ice season is also contracting in many cases, with lakes now tending to freeze over later and thaw out sooner.  ....

United States , John Magnuson , James Kessler , Catherine Oreilly , Department Of Integrative Biology , Media Association , University Of Wisconsin , Department Of Geography , National Ski Areas Association , American Association Of State Climatologists , National Report Of Fishing , Us Ice Fishing Association , Environment At Illinois State University , Great Lakes Environmental Research Lab , Great Lakes Environmental Research Laboratory , Great Lakes , Lakes Environmental Research Laboratory , Earthrise Media , Lake Erie , Local Media Association , Covering Climate Collaborative , Climate Matters , Wildlife Associated Recreation , Fishing Association , Climate Central , Thin Ice ,