A couple of things struck me as I read through these threads. It doesn't matter what the temperature is if the humidity factor is high. In Vancouver, where it rains for nine months of the year, and in Squamish, an hour's drive north of Vancouver (where I'm certain that GOD must have practiced for the flood!!!

) where it rains nearly all year, it's impossible to keep a vehicle, and especially an RV, dry unless you're heating with dry heat 24/7 for nine months of the year.
When Brian and I lived in Yukon Territory, the temps dropped down to -50F, but that was a dry cold and very different from -30F in Bralorne (high humidity clime). Even in our house in the Yukon, WITH a wood stove going 24/7, we'd wake up every morning to frost climbing the walls (all of 'em) to a height of circa 4', but that aside, we weren't uncomfortable in the house and we didn't have to overdress either.
Humans seem to adapt to temperature variances quickly enough (I know I did when we moved up north to Yukon Territory), but RVs and houses don't fare too well at all.
The
worst environmental condition for mobile living, in my opinion, is the cold and
very wet scenario we have in coastal BC. Brian and I and our youngest daughter lived one winter in a huge rented RV in Whistler (don't remember the size, but it was more than 40') and despite 3 x 1,500 watt heaters, it was freezing and wet (not just damp). I don't think we took our snow suits off except to pee and visit the local rec center to swim and thoroughly wash once a week.
Hope this makes sense.
Jesse.