Clean your bike right afterwards
All the slush and moisture from the snow can corrode your bikes if left unattended. So make sure the moment you get home, you clean your bicycle right away. Use a thick lubricator such as NixFrixShun to ensure all your parts run smoothly.
Never use WD-40 on your bike. However, you can spray a bit of it on your bike chain to get ride of excess moisture. For more information on proper bike maintenance, click here.