Light meters consider 18% grey to be a “normal” exposure. Snow, however, is up to two stops brighter than this. So when there are large swaths of snow in a scene, overexpose by two stops or else the snow will come out grey.
Use A Good Camera Bag/Backpack
Of course, this doesn’t apply strictly to cold weather scenarios — you should always be using a functional, high-quality bag. But it takes on added importance when you’re working in less than ideal conditions.
You need to be able to safely store your gear while you’re not using it. Be sure your bag is well padded, has room for a few extras and provides a waterproof cover.