First I would like to remind you of the recommended storage conditions for most brands of paint. The longer the exposure to these extreme conditions, the less reversible the effects. An exposure of 45 to 60 minutes in moderate conditions will be sufficient. Humidity will have less effect if the paintballs are kept in the plastic bags and securely closed by twisting the bag and tightly sealing shut with the twist tie. I think most players will agree, for a number of reasons, that the best time to play paintball is in the spring and fall.
Temperatures are usually in the range of the optimum storage conditions and the humidity is low.
Paintballs become very brittle in the cold. This is apt to cause breakage in the carton, loaders, hopper, barrel, and of course, on the target. While break- age on the target is preferred, anywhere else can be a mess. So keep the paint in a warm car while you are playing. Between games, store your butt packs, loaders, and hopper in the car.