Moby-Dictionary

Hyperborean
A. adj.
1. Of, pertaining to, or characterizing the extreme north of the earth, or (colloq. or humorously) of a particular country; in ethnological use, cf. B.
b. Of or pertaining to the fabled Hyperboreans.
2. (nonce-use.) Surpassing that of the north wind.

B. n.
An inhabitant of the extreme north of the earth; in pl. members of an ethnological group of Arctic races. loosely and fig. One who lives in a northerly clime.

"Ever and anon a bright, but, alas, deceptive idea would dart you through. - It's the Black Sea in a midnight gale. - It's the unnatural combat of the four primal elements. - It's a blasted heath. - It's a Hyperborean winter scene. - It's the breaking- up of the ice-bound stream of Time."


Tips for modern usage:
"I like your new fur hat, guy. Very Hyperborean-chic."
"This Hyperborean weather is giving me a hypo."