adj. 1. far north; Arctic 2. very cold; frigid

synonyms- frozen, icy, brisk

antonyms- warm, pleasant, temperate

The Northeast did not experience the same hyperborean temperatures that they had in winter last year.

She was so used to living in hyperborean areas that she could not stand in the heat without becomin uncomfortable.

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Ice Age 2 - Mission Impossible Scrat