operating temperatures down to -15C
I would personally triple check to make sure this means what you think it means.
Assuming it does, you should be in the clear. Cutting the power when it gets colder is probably not necessary since the freezer won't have any reason to run, but it might be a worthwhile precaution anyway. If for some reason the compressor does try to run with frozen oil, it might damage itself or try to draw too much power and blow a breaker (or start a fire if your wiring is sketchy). Better to be on the safe side.
Vulcan, Alberta.
Famous because of a spaceship that landed there once, I think.
Some people with pointed ears may have also been involved, but I would replicate that with a grain of salt. I haven't really looked into it.