Khartoum is usually hot and dusty. During May, June, and July, daily high temperatures average around 100 F or higher, with frequent dust storms called "haboobs." July, August, and part of September are not as hot, with rare but heavy rainstorms (average 8 inches yearly) and continuing haboobs. From November until April, daily temperatures range around 95 F; nights, around 70 F, are pleasant. Cool weather at night and in the early mornings sometimes requires light sweaters or blankets.