The mountain areas receive more rainfall, and annual rainfall on the higher parts of the Jabal Akhdar probably exceeds . Low temperatures in the mountainous areas leads to snow cover once every few years. Some parts of the coast, particularly near the island of Masirah, sometimes receive no rain at all within the course of a year. The climate is generally very hot, with temperatures reaching around  (peak) in the hot season, from May to September. Drought and limited rainfall contribute to shortages in the nation's water supply. Maintaining an adequate supply of water for agricultural and domestic use is one of Oman's most pressing environmental problems, with limited renewable water resources.