Hamilton Spectator: The combination of an unseasonably mild winter and spring followed by a hot summer has led to record-breaking water temperatures in the Great Lakes. Lake Superior is a stunning 8 C above normal for this time of year — and the big lake they call Gitche Gumee will get warmer still for another few weeks. “It’s really remarkable,” said Jay Austin, a professor at the University of Minnesota-Duluth’s Large Lakes Observatory. “The surface waters on Superior at one site are …