Climate Like much of the Pacific Northwest, according to the Köppen climate classification, Mount Vernon falls within a cool dry-summer subtropical zone (Csb), with "cool"-summer Mediterranean characteristics. Other sources classify it as belonging in the marine west coast climate (Köppen Cfb) zone, with cool, wet winters and warm, distinctly drier summers.
Climate Like much of the Pacific Northwest according to the Köppen climate classification Mount Vernon falls within a cool dry-summer subtropical zone (Csb) with "cool"-summer Mediterranean characteristics Other sources classify it as belonging in the marine west coast climate (Köppen Cfb) zone with cool wet winters and warm distinctly drier summers