Index of aridity

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index of aridity[edit | edit source]

A measure of the precipitation effectiveness or aridity of a region, proposed by De Martonne (1925), given by the following relationship:
ams2001glos-Ie4
where P (cm) is the annual precipitation and T (°C) the annual mean temperature.

De Martonne, E. 1925. Traité de Géographie Physique. Paris.


The degree to which a climate lacks effective, life-promoting moisture; the opposite of humidity, in the climate sense of the term.

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