I know this is commonly accepted knowledge, but I regularly take my ES335 nitro finished guitar out into very cold Swiss temps (certainly below freezing) and open the case when I get to practice and get home, with less than 20 minutes or so of acclimation time. I know people like to wait a day to open a guitar case, but I think things warm to safe temps pretty fast. In the deep winter, I take my US fender with the thick plastic finish out with a zero to 5 minute wait. The strings are often cold to the touch on the warm up song . If it aint nitro, don't worry. The strats are polyurethane US series guitars. Of course, if you don't have to make the abrupt temp change, don't risk it and leave it. Just my 2 cents. Climate and paint are complex interactions, so best to be careful.