Don't let the winter chill keep you off of the streets. Running in winter is fun, but you have to dress appropriately. Starting with your feet, because if they are cold you'll be miserable. Wear some ski sock liners made out of poly-pro with wool and/or silk blended in. These will keep your tootsies toasty. If the temperature is lower than 20 degrees, I'd opt for ski socks since they're thicker.
You are also going to want a top and bottom base layer made out of poly-pro or merino wool something that you can move in that also wicks the moisture away from your skin. Cover this up with a thin nylon shell to break the wind and keep you protected from the elements.
Keeping your hands warm is also key, so wear some poly-pro gloves or mittens. Don't forget a hat! A light weight wool stocking cap should do the trick.
Remember that it also takes the body longer to warm up in cold weather so add a few minutes onto your warm up time.
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