cities and towns such as ouargla, touggourt, beni abbes, adrar, in salah are among the hottest places on earth during the height of summer. the annual average rainfall is well below 100  mm (3,93 in) in the northernmost part but the center and the southern part receive much less than 50  mm (1,96 in) and are therefore hyper-arid and among the driest places on earth.