Camping well below freezing - Sweden over winter

Yup, folks up here camp for weeks at a time in these temps in ski area parking lots. Granted that is not an entire winter but if they are properly supplied with food, water, power and propane they will survive. Also, the -30 is occasional (mostly in February), not continuous so in the other winter months expect more temperate temperatures.

It won't be easy but it is doable.