Boreal(a.) Northern; pertaining to the north, or to the north wind; as, a boreal bird; a boreal blast.
Thesaurus Entries
Siberian, aeolian, aestival, airish, airy, algid, antarctic, arctic, austral, autumn, autumnal, below zero, biting, bitter, bitterly cold, blasty, bleak, blowy, blustering, blusterous, blustery, breezy, brisk, brumal, canicular, cold, cold as charity, cold as death, cold as ice, cold as marble, crisp, cutting, drafty, east, eastbound, easterly, eastermost, eastern, easternmost, equinoctial, favonian, flawy, freezing, freezing cold, fresh, frigid, gelid, glacial, gusty, hibernal, hiemal, hyperborean, ice-cold, ice-encrusted, icelike, icy, inclement, keen, meridional, midsummer, midwinter, nipping, nippy, north, northbound, northeast, northeasterly, northeastern, northerly, northern, northernmost, northwest, northwesterly, northwestern, numbing, occidental, oriental, out of season, penetrating, piercing, pinching, puffy, raw, rigorous, seasonal, severe, sharp, sleety, slushy, snappy, solstitial, south, southbound, southeast, southeasterly, southeastern, southerly, southern, southernmost, southwest, southwesterly, southwestern, spring, springlike, squally, stone-cold, subzero, summer, summerlike, summerly, summery, supercooled, vernal, west, westbound, westerly, western, westernmost, windy, winter, winterbound, winterlike, wintery, wintry