Our biggest issue when the weather turns cold is the lack of desire to drink and hydrate! It's cold, you aren't "Thirsty". You have to hydrate. Here's a short video on how to keep from dehydrating during the winter!
It's 2016...and now time to get on your strength training! Do not neglect what most all endurance athletes neglect..and that's strength training. Give us two months..and some maintenance work and you will be much happier and faster!