Data sources: Köppen types calculated from data from PRISM Climate Group, Oregon State University, http://prism.oregonstate.edu; Outline map from US Census Bureau -3°C isotherm used to distinguish temperate (C) and continental (D) climates. When a -0°C isotherm is used, much of the Csb climate areas found east of the Cascades becomes a Dsb, as these climates have a minimum monthly mean temperature between 0 and -3°C.
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