The last of the ice on Superior didn’t melt till June 11....
Ice on Lake Superior in July
http://iceagenow.info/2014/07/ice-lake-superior-july/
But it’s summer! Bizarre scenes as ICEBERGS are spotted still floating in Lake Superior in the middle of June
10JUN2014
Icebergs can still be seen floating in Lake Superior near Madeline Island, off the shore of Wisconsin
The Great Lakes were declared ice free on June 7 following a record-breaking seven months of ice coverage
They usually thaw by May
Lake Superior was found to be the most affected by the harsh winter and was found to be 63.5 percent ice covered on April 20
In March the Great Lakes were 92.5 percent frozen
http://www.dailymail.co.uk/news/article-2654119/But-summer-Icebergs-spotted-floating-Lake-Superior-despite-Great-Lakes-declared-ice-free.html