KOMPRESSOR:My curiosity, what are watertemps like in Great Lakes? -Wetsuits?!...
It really depends. Last week out of 6 divers 5 had drysuits and one was in 7mm. It got down to 45-48 depending on who's temp you looked at. But that was still at 70 feet or lower. The deepest anyone went was about 200. SO the themal hits 2-4 times. But the surface was nie nough for a 20 minute swim to get out of the heat during our surface inter.
The basic question is what do you consider cold? Even with drysuits some of our divers only wear sweats while others full undergarments. And the poor wear 7mm wetsuits