USB hand warmers are your friend. Layers of clothing, so you can get less dressed once you get where you’re going. If you drive in the snow, pretend your brakes have been cut and so you need much more stopping distance. Gloves that have capacitive finger tips so you can use your phone while wearing them are awesome. Walk like a penguin (shuffle feet, short steps center of balance always above your feet) on ice, so you don’t slip and fall. Snow is reflective, like the ocean, so sunglasses are nice in winter.