Otherwise, sweat built-up during the early miles will chill you to the bone when you turn into the wind. Always use extreme caution in snowy or icy conditions. Face traffic and don't assume drivers can see you. And even if they can see you, don't assume they can stop in time if the roads are slick. If your footing is bad, think how tough it is for that '74 Pontiac with the bald tires that you just darted out in front of.
Winter is the time to maintain conditioning and to work on an endurance base for the spring.
If you do feel the need to run fast, work into it. Allow the muscles to warm up thoroughly during the early miles before picking up the pace. Muscle strains and pulls may result if you try to do too much too soon. After your workout, enjoy a nice warm shower, then stretch gently for five or ten minutes and rehydrate by drinking plenty of water. Mother Nature through those cold and dreary days of winter.