When the weather is cold, and the humidity is low, humectants like glycerin can actually do the opposite of their intended use and cause dryness. A humectant draws moisture from the air, but when there is so little moisture in the air, it can actually draw moisture out of the hair and have a drying effect. I like Jessicurl and her Too Shea Conditioner and Deep Conditioning Treatment for cold weather hair dry - awfulness prevention - and also for LOW POROSITY HAIR in any climate, even with higher humidity. My usual faves, like DevaCare One Condition and Ouidad Moisture Lock are Glycerin heavy, but usually work well - even low porosity hair - in our humid climate here in Florida. I live in a veritable sauna. Bible.
As always, you'll need to try them for yourself to see which works best for you! Some of my low porosity clients have told me they use different products depending on the humidity. This is a small step to take to ensure a day (or 2, or 3) of happy curls.
A humidifier is a great way to pamper your curls during dry winter months, also, try the awesome benefits of a facial steamer to keep your skin looking dewy and help keep that "leathered look" at bay. ;)
A handheld hair steamer like the Q-Redew is a an easy way to get moisture into your winterized locks and also a very helpful curl reactivator/refresher!