Sure, it gets cold in the winter there, but, say, -20C is not too cold to get out of the house to get some firewood nearby.
I walked at -20C to school as a kid, and it was ok. I wouldn't go out when it was -30C, but considering the mean of -18C, -30C would be rare, and almost never in the middle of the day.
Bottom line: people have lived just fine for thousands of years in much harsher climates, for example, a thousand miles north from where she lives.
Bottom line: people have lived just fine for thousands of years in much harsher climates, for example, a thousand miles north from where she lives.