 During May, June, and July, temperatures range from in the morning to more than by afternoon.Throughout the year, the harmattan often causes blinding sandstorms.The administrative regions (formerly called cercles) of Tiris Zemmour in the north, Adrar in the center, and northern Hodh ech Chargui in the east, which make up most of the Saharan Zone, are vast empty stretches of dunes alternating with granite outcroppings.