When you're out shooting in wintery weather, the first rule to remember is that snow is dust—until it melts. There's always debate about keeping the camera and batteries warm to keep them functioning. This is certainly important in extreme temperatures, but if you're shooting in more moderate, but still below-freezing conditions, your camera probably doesn't need any special attention. To make sure you're adequately powered, you can keep extra batteries in a warm pocket and change them out as necessary. By keeping the camera itself at ambient temperature, you ensure that any snow that comes into contact with it can be quickly dusted off without any drama.