(a.) Northern; pertaining to the north, or to the north wind; as, a boreal bird; a boreal blast.

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