Trewartha climate classification

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The Trewartha climate classification (TCC), or the Köppen–Trewartha climate classification (KTC), is a climate classification system first published by American geographer Glenn Thomas Trewartha in 1966. It is a modified version of the Köppen–Geiger system, created to answer some of its deficiencies.^[1] The Trewartha system attempts to redefine the middle latitudes to be closer to vegetation zoning and genetic climate systems.^[2]