So interesting to hear the various comments. I'm even more certain that I wouldn't like to live in such cold places. Not even sure if heated seats are offered on the CX-3's here in Ozz.
The coldest we get in my location is around 0 degrees C (maybe 3-4 days a year). Usually starts the day around 5-8 degree C rising to 12-15 in the middle of winter. Sure we have to scrap ice from the windscreen some mornings but, that's it (Not me, thankfully I have a garage)

)
As for snow, it has not fallen in Melbourne's suburbs since June* 25, 1986, while the last major Melbourne snowfall was in 1951. So, of course no need to add salt to the roads (with it's corrosive effects).
After reading about the "block heaters" I would think they would be worthwhile if the temperature was constantly under 0 degrees C.