You are committed to your cardio and there is no stopping you - not even the cruel snow or the horrible chill. So, out you go against the elements. Having such determination is definitively a positive thing, but can your body withstand it?
Admittedly, your muscle tissue cannot perform as well as in summer. Hitting the wall is sooner and your body starts using alternative fuel sooner than later. You should still take care of yourself and observe certain rules to avoid your skin getting frost-bitten and your lungs oxygen-depleted. We will call them the rules of winter running:
Do more warm-ups
Your muscles will not contract with the same intensity as with the summer. So, to help your body properly acclimate to the chill, extend your warm-up time before hitting the pavement.
Start slowly. Your body needs to get acclimated to the chill of the season.
Keep your gear light
Don't overdress. Remember that it is some fat that you want to burn, not eliminate water. Dress like you would do if it were 10 or 15 degrees warmer if you are planning on doing some brisk 30-minute walk. If you are planning on doing a hard work-out, then consider wearing clothes as if it were around 20 degrees hotter. It will feel pretty cold at the start but then your body will begin to warm up and will be able to cope.
Staying hydrated while running is as important in the winter as it is in the summer. You might not feel as thirsty but this does not mean that you should not keep the water at optimal levels.