I live on the prairies in Canada, and our winters can and do hit -30C in winter. In my truck I have a Sony 10 disc CD player, dealer installed back when I bot the truck new in '01. I filled up the player up back then with some burned CD-R's (burned on my $450 2X CD HP writer
). I listen 99% to the radio (CBC), so those original discs are still in it (they are all compilation discs, so that does help me not tire of them also). When I do play them, they play fine
, and they have seen temps from -35C to +38C, through the seasons over a 5 year period. Not only have they survived getting that cold, they have survived the rapid warm up that happens when you use the vehicle, which IMO would be harder than a slow cool down or warm up. I personally don't think you have anything to worry about.