Here in northern Iowa we get alot of snow and very cold trmp, and I store my planes in my heated shop. I keep my Tx and Rx batteries stored seperately from the plane and keep them always on a charger. I cycle the batteries once a month. The planes engines are winterized every fall with after run oil (both glow and gas).
I've heard of people useing plastic ceran wrap andwraping there planes in it to keep the moisture out and keeps the covering from wricleing and looking like an old prune. I havent resorted to this and just use a heat gun in the Spring time. all has worked well for the past 16 yrs. for me.
In the Spring I check all the glue joint I can including the hinge joints, and run at least one tank of freash fuel through the engine before flying.
NEDYOB