Now THAT'S cold .
I shall now consider myself a bit of a whimp if I don't take my boat out in January, in a force 9, naked and with razor wire wrapped around the seat!
I did have the feeling that it was better to leave it inflated for the winter. It is in my garage up at our house in Scotland. I just took a little bit of pressure off the tubes. I flushed the engine with fresh water, polished it up and sprayed all the exposed metal bits with WD40 (tool box in a tin - great stuff).