Arid
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- For the Belgian rock band, see Arid (band).
An arid environment has a extremely low yearly precipitation, receiving much less rain or snowfall annually than would satisfy the climatological demand for evaporation and transpiration. Regions are classified as arid if their aridity index falls between 0.05 and 0.20.
Two of the world's most arid deserts lie in Iran.[citation needed]
Most deserts are semi-arid, arid or hyperarid, with the notable exception of Antarctica.
| Climate types under the Köppen climate classification |
|---|
| Class A: Tropical (Af) - Monsoon (Am) - Savanna (Aw, As) |
| Class B: Arid (BWh, BWk) - Semi-arid (BSh, BSk) |
| Class C: Humid subtropical (Cfa, Cwa) - Oceanic (Cfb, Cwb, Cfc) - Mediterranean (Csa, Csb) |
| Class D: Humid continental (Dfa, Dwa, Dfb, Dwb) - Subarctic (Dfc, Dwc, Dfd) - High-altitude Mediterranean (Dsa, Dsb, Dsc) |
| Class E: Polar (ET, EF) - Alpine (ETH) |
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