Jonathan,

I sailed my 18SX in CSC's Lake Jordan Winter series last December, February and March. I was warm enough (not necessarily comfortable) in a full-length, three mil wetsuit, neoprene boots, sailing gloves and a windproof layer on top. In January, I took my tour of duty on the RC boat so that I could bundle up. In March, we turtled the boat and were over for a while (my crew and I were more than 40lbs underweight, so we had to wait for the committee boat to pull us up, which came after it righted the lightning that flipped on top of us). We weren't too cold after that, and finished out the afternoon's races, but it was the end of March when this happened.

As I said, the clothes we wore kept us warm enough, but not necessarily comfortable. Also, and more importantly, I was not solo on the boat and there was always a committee boat and other sailboat nearby to help if we got in trouble. So, as others have said, if you are going to sail around here this winter, make sure there are other people around. Hopefully I'll be out there some for the Winter Series (if I ever find out when it is).