While the air outside is warming up, the Great Lakes will remain cold for weeks to come. Here's when it'll be swim weather.

While the air outside is warming up, the Great Lakes will remain cold for weeks to come. Here's when it'll be swim weather.

This early in the season, cold water temperatures can easily turn a fun day by the lakeshore into a dangerous situation.

"It's cold from the top to the bottom. And that means that when the wind blows, the density of the water is the same at the very top of Lake Michigan and at the very bottom," Cuhel explained.