Page "Pacific Northwest" Paragraph 29

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 ).