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Trewartha climate classification
The Trewartha climate classification is a climate classification system published by American geographer Glenn Thomas Trewartha in 1966, and updated in 1980. It is a modified version of the 1899 Köppen system, created to answer some of the deficiencies of the Köppen system.〔Peel MC, Finlayson BL, McMahon TA (2007) Updated world map of the Köppen-Geiger climate classification. Hydrol Earth Syst Sci 11: 1633−1644〕 The Trewartha system attempts to redefine the middle latitudes to be closer to vegetation zoning and genetic climate systems. It was considered a more true or "real world" reflection of the global climate. For example, under the standard Köppen system, western Washington and Oregon are classed into the same climate zone as Southern California, even though the two regions have strikingly different weather and vegetation. Another example was classifying cities like New York in the same climate group as Brisbane or New Orleans, despite great differences in seasonal temperatures and native plant life.
==Scheme==
Trewartha's modifications sought to reclass the middle latitudes into three groups: ''C'' (subtropical)—8 or more months have a mean temperature of or higher; ''D'' (temperate)—4 to 7 months have a mean temperature of 10 °C or higher; ''E'' (boreal or subarctic)—1 to 3 months have a mean temperature of 10 °C or higher; and F (Polar) have all months with a mean temperature below 10 C.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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