Pacific Northwest - Climate

Climate

The Pacific Northwest experiences a wide variety of climates. An Oceanic climate ("marine west coast climate") occurs in most coastal areas, typically between the ocean and high mountain ranges. An Alpine climate dominates in the high mountains. Semi-arid and Arid climates are found east of the higher mountains, especially in rainshadow areas. The Harney Basin of Oregon is an example of arid climate in the Pacific Northwest. Humid continental climates occur inland on windward sides, in places such as Revelstoke, British Columbia. A Subarctic climate can be found farther north, especially in Yukon and Alaska.

Under the Köppen climate classification, a cool summer version of the dry-summer subtropical (Csb) designation, typically referred to as "Mediterranean", is assigned to many areas of the Pacific Northwest as far north as southern Vancouver Island and the Gulf Islands, including cities such as Victoria, British Columbia, Seattle, and Portland. These zones are not associated with a typical Mediterranean climate, and would be classified as Temperate Oceanic (Cfb), except dry-summer patterns typical to the Pacific Northwest meet Koeppen's minimum Cs thresholds. Other climate classification systems, such as Trewartha, place these areas firmly in the Oceanic zone (Do).

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