It’s not as cold as Canada in Scotland but on Friday we left for a 500 mile trip. It was 0c when we left and after two hours 158 miles it climbed to 6c when we charged. We carried on but as the temperature rose further to 12c we managed 250miles - there were sections where road works limited speed to 50mph for long sections.
Warmth makes a massive difference. I think for every 10 miles an hour it drops 1c.