Hyperborean is a noun that refers to an inhabitant of the cold north. It can also be used as an adjective that means related to the far north.
In ancient Greek mythology, our word of the day was used to describe members of a group who lived in a land of sunshine beyond the north wind. Centuries later, hyperborean retains the same meaning. Here’s an example of it:
You’d think a hyperborean like uncle Brad would be accustomed to the cold, but even after all those years of living in Minnesota, he still complains every time the temperature dips below sixty.