Unfortunately, around most of its shores, it is too cold to swim in, even in summer. It is great to look at, though, at any time. In the winter, the spray from the waves freezes into ice at the shore. When it gets really cold, the shallow waters of the lake near the shore also freeze.
We enjoyed spending some calm vacation days on the North Shore. I know we'll go back, but I sure wish I could swim in the lake.