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The Gaussen Index or xerothermic index is a method of calculating and comparing aridity.
According to Henri Gaussen , a given period is said to be arid, when: P < 2 × T {\displaystyle P<{2\times T}}.
The resulting index number indicates the number of biologically dry days in a year for a given location. The data includes not only precipitation stricto sensu but also fog, dew and humidity of the air.
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