The sky is usually cloudless or only partly cloudy.
It was a cloudless, northern, summer night.
A few showers are all that fall from the almost invariably cloudless sky above the Transcaspian steppes.
Apart from these the two seasons are sometimes broken by cloudless skies in winter, and a drizzling mist, called the gariia, in summer.
In the hottest (western) portions of the true desert on the Mexican border the daily maximum temperature is about IIo° F.; but owing to the rapid radiation in the dry, clear, cloudless air the temperature frequently falls 40-50° in the night.