My family thinks I am a bit crazy but so long as water is liquid I think it is a potential sailing day? I mean some of them live in CO and think nothing of spending the whole day outside skiing in very cold conditions. I say layer up and you will be fine. I might sail a bit more conservatively so as not to stress the boat but temp simply is not much of a factor for me. Now rain accompanying... That would be a different story. Whatchathink?