ok.. my CCD chip is sitting at 5.5 degrees and im getting abit worried. Current temp is at 3-4 degrees in melbourne

and i can't feel my fingers. my UHC-S filter is actually glued to the rings on my DSI thats how cold it is. can't unscrew it. was wondering if this is a safe tempreture for imaging? It shouldnt do any damage to the actual CCD chip itself?
tthhanksssss *shaking*