The toughest things for me about windsurfing in cold weather are: 1) keeping my hands warm, which requires thick gloves, and 2) keeping my forearms from cramping, which requires thin or no gloves. Friday evening it was sunny and about 47 degrees in Nahant, so I decided to go with no gloves. My hands got quite cold and numb, but not past the point of working. The nasty part was after the session when I was walking my gear back to the van and the blood started returning to my hands. That part always hurts a lot. It was a mellow side-shore wavesailing session with buddies, though, so it was worth it. Here's the video.