climatic optimum
noun
1A set of climatic conditions which are most favourable for a particular species or for human comfort and health (rare ).
2 Palaeontology and Archaeol. any of various historical or (usually) prehistoric periods characterized by comparatively warm and dry conditions compared to the preceding and following periods, specifically (also Climatic Optimum) such a period which occurred in northern latitudes in the early Holocene, after the last glaciation (approx. 9000 to 5000 years ago, but varying with location).
Origin
Early 20th century; earliest use found in Frederic Edward Clements (1874–1945).
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