Doha has a hot desert climate (Köppen climate classification BWh) with long, extremely hot summers and short, warm winters. The average high temperatures between May and September surpass 38 °C (100 °F) and often approach 45 °C (113 °F). Humidity is usually the lowest in May and June. Dewpoints can surpass 30 °C (86 °F) in the summer. Throughout the summer, the city averages almost no precipitation, and less than 20 mm (0.79 in) during other months. Rainfall is scarce, at a total of 75 mm (2.95 in) per year, falling on isolated days mostly between October to March. The winter's days are relativity warm while the sun is up and cool during the night. The temperature rarely drops below 7 °C (45 °F).