"polar desert biome"^^ . "2013-04-07T14:28:08Z"^^ . "ENVO:01000186"^^ . _:b1218317 . "Preliminary definition. The semantics and definitions of \"mediterranean\", \"subtropical\", \"tropical\", \"temperate\", \"polar\", and similar climate types may be transferred to an \"environmental condition\" class once the semantics of this class have been established."^^ . "A polar desert biome is a desert biome which is subject to low levels of insolation, annual precipitation less than 250 millimeters, and a mean temperature less than 10 degrees Celsius during its warmest month. Temperature changes in polar deserts frequently cross the freezing point of water."^^ . "ENVO"^^ . _:b1218317 . . . _:b1218317 . _:b1218317 . "pbuttigi"^^ .