The climate generally is very hot, with temperatures reaching 54°C (129°F) in the summer, from May to October. Annual rainfall in Muscat averages 100 mm (3.9 in), falling mostly in the winter. Dhofar is subject to the southwest monsoon, and rainfall up to 640 mm (25.2 in) has been recorded in the rainy season from June to September.. While the mountain areas receive more …