Precipitation in Gaborone is scanty and erratic. Most of the rainfall in Gaborone falls during the summer months, between October and April. There are on average forty days of thunderstorms per year, most of them happening during the summer months, and four days of fog, usually happening during the winter months. Gaborone has been affected by three floods based on records going back to 1995, one in 2000, one in 2001 that caused an estimated 5,000,000 Botswana pula worth of damage, and one in 2006.