Cold Bay has an either an ocean-moderated subarctic climate (Köppen climate classification: Dfc) if the 0 °C isotherm is used, or a subpolar oceanic climate (Köppen climate classification: Cfc) if the -3.0 °C isotherm is used, both of those climate being typical of southwest Alaska, though the summers are almost cool enough to qualify as a tundra (Köppen climate classification: ET).