Depending on the desert and time of year it could be rain, hail or snow.
Rain, hail, snow and sleet can fall in most deserts.
The coldest desert in the world is the Antarctic Desert. It is the coldest, largest and windiest desert in the world, and almost all of the precipitation that falls in the Antarctic Desert falls as snow
How much precipitation falls to the earth in a typical year
Less than 10 inches (250mm) of precipitation per year, or where more water is lost by h evapotranspiration than falls as precipitation.
To be considered as a desert, a region must receive less than 10 inches (250 mm) of precipitation per year on average.
Antarctica is considered a desert because of low precipitation. You can consider Antarctica a polar desert.
Depending upon the particular desert and season of the year precipitation can fall as rain, hail, sleet, snow or graupel.
Snow.
Depending upon the specific desert and season of the year, a desert may receive rain, sleet, hail, graupel or snow.
A desert receives between 0 and 10 inches (250 mm) of precipitation per year on average.
Rain, snow, sleet and hail may fall in the desert, depending on location.
Over 200 cm (80 in) of precipitation annually falls in the rain forest.