Hey all!

I'm a 2a with pretty light/fine hair and have been in the Southeast US for a month--and got a stellar haircut that I love! But on returning to the Northeast, my hair has totally wimped out--the underlayers have flattened right out and even some of the top pieces are oddly perfectly straight. I assume it's the dry cold (or maybe some difference in water?) because my routine is exactly the same: co-wash every other day, leave-in, gel scrunch, air-day. Any tips or advice?