Yes, you read the title correctly. Lake Superior is not warm even in the summer months, rarely exceeding 60 degrees. In the winter months, well, let's just say it's cold. But not too cold for contributor Andrew Achter and his friends, who attend the University of Minnesota Duluth. They took a jetski out on the Duluth Harbor when it was plenty cold outside but the lake was still jetskiable - that is, before it froze completely for the winter!