Khartoum main Nile ("see map, upper right") as it zigzags through northern Sudan into Egypt at Lake Nasser. Khartoum is relatively flat, at elevation , as the Nile flows northeast past Omdurman to Shendi, at elevation about away. Under Köppen's climate classification system, Khartoum features a hot arid climate, with only the summer months seeing noticeable precipitation. The city averages a little over of precipitation per year. Based on annual mean temperatures, the city is one of the hottest major cities in the world. Temperatures routinely exceed in mid-summer. Its average annual high temperature is , with six months of the
Khartoum (state) Nile State, and in the west by North Kurdufan. There are several etymologies for the name of Khartoum. The explanation suggested as "most correct" by the state government's website is that it comes from the Arabic for "elephant's trunk", which describes the shape of the site of the city at the confluence of the two Niles, where a stretch of land extends into the water. Other stories are that it is a corruption of "gurtoum", the name for seeds of the sunflower plant, supposedly used by Roman invaders at the current site of Khartoum to treat soldiers' wounds, or that