We be a breed apart.
You can swim in Superior but not for long. In late July till early September if the water has been still and the sun shinning for a few days, the top few feet can be very pleasant. Get below that warm layer and Gordon Lightfoot's, "ice water mansion" term comes to mind. But mostly it is pretty cold. Adverage temperature is 40 degrees. They say you don't fall into Superior, you bounce out.
Cape Dory 36 - Mariah