There can be severe frost generally and even weeks of snow in the mountains. The western and eastern regions are hot and humid in the summer months, with maximum temperatures around 42 C, while the winters are warm. In the north, annual rainfall varies between 100 and 200 mm. Further in the south, except near the coast, annual rainfall drops below 100 mm. Water resources Heavy rainfall sometimes results in flash floods of short duration.
River beds are dry for the rest of the time.
Part of the surface runoff percolates through the sedimentary layers in the valleys and recharges the groundwater, some is lost by evaporation. About 1 km recharges the usable aquifers. Spate irrigation area - ha 3. About 45 new dams were planned to be built. A major dam, the Bisha dam in the south-west with a capacity of 325 million m , was under construction in 1993.