Most of the country lies within the zone of dry tropical climate. Muscat, the capital of the country, is considered as one of driest cities of the world. Average temperature of June is 34 °C (93 °F) and at winter it is 26 °C (79 °F). At spring heat become exhausting due to dry winds from Rub’ al Khali desert. Summer winds are often causing sand storms. Precipitation is few with annual amounts from 25 to 500 mm (1-20”) depending on location.