Swimming Question of the Week - June 23, 2010

Continuing with our open water questions...

Having swum the Chesapeake Bay Swim just over a week ago, we got back in the Bay this morning and discovered the water was 78°.   The question a couple weeks ago with the water being 74° was... do you wear the wetsuit?  At 78°, it would have been less of a question, so none of us wore one.

With that said, and with the Kingdom Swim quickly approaching (5 weeks will be quick!), and no wetsuits allowed...

What's the coldest water you'd swim in without a wetsuit?