Your violin family instrument is only comfortable where YOU are comfortable. Also, a black case left in direct sunlight will very soon be too hot for comfort. The violin family of instruments is glued with animal hide glue. At low temperatures, the relative humidity is low, typical of winter or heated homes in the winter. Lack of humidity causes the wood to shrink and crack.
Low humidity can also cause the bow hair to shorten.
Remember, your instrument is only comfortable where you are comfortable. The instrument should have the strings loosened about a half step or so. The bow should be loosened completely. Clean both the instrument and the bow before storing. Check the instrument at least once a year for crack, loss of neck angle, slipped pegs, broken strings, etc.