upwelling

Incredible: Lake Superior's Temp. Dropped Down to 38 Degrees This Week

Dennis Mersereau · 07/31/14 10:00AM

The water temperatures along coastal regions of Lakes Michigan and Superior took an astounding 25 to 30 degree plunge overnight on Monday. Parts of Lake Superior bottomed-out at 38°F, while parts of eastern Lake Michigan hit 41°F. These temperatures are more common in April than the last week in July.