We're talking here about downhill skiing, though the tips for great downhill photos are true for snowboarding as well. Batteries often fail in the cold.
Shutters become sluggish.
Static electricity may fog your film. We suggest you read our January article on Cold Weather Photography which includes tips and techniques for those venturing out with a camera in freezing conditions. But in general, when it comes to skiing, the basic tenets you need is to keep the camera and batteries warm when you're outside. We suggest you keep them inside your parka, close to the warmth of your body. Take them out only when you are ready to shoot.