Nothing At All????
It's too cold and dry in Antarctica to rain, except on rare occasions on the Antarctic Peninsula. Precipitation that does not evaporate above it and falls on the continent, falls as ice crystals.
* Africa (Sahara) * Australia * Asia (Mongolian) * and Antarctica (deserts do not have to be boiling and sandy; they can be sub-zero - it is just a matter of how much precipitation falls there. Antarctica is too cold to rain, hence much of it is defined as desert).
The only true polar desert is Antarctica and, except for along some coastlines, it receives no rain and little snowfall. It is the driest desert on earth according to some.
never
It does not rain on the moon.
50mm
rain
A rain gauge
180inches
5ft
69
chicken