The sky is usually cloudless or only partly cloudy.
A few showers are all that fall from the almost invariably cloudless sky above the Transcaspian steppes.
It was a cloudless, northern, summer night.
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.