The months between May and October are extremely hot, with shade temperatures of between 38° and 49°C (100 to 120°F) and high humidity near the coast. Winter temperatures can fall as low as 2°C (36°F) but average between 17° and 20°C (63 to 68°F). Normal annual rainfall is from 5 to 10 cm (2 to 4 in), with considerably more in the mountains; most rainfall occurs between November and February.