Beijing, located at 39.56 degrees north latitude and 116.20 degrees east longitude, is situated in the north of the North China Plain. Surrounded by mountains to its west, north and northeast, the city slopes southeast on the Bohai Sea. It covers 16,410.54 square kilometers, including 16 districts. Beijing has a semi-humid continental climate, characterized by short springs and autumns, hot and rainy summers, as well as very cold and dry winters. In 2018, Beijing's annual average temperature was about 11.9 degrees Celsius, and its annual average precipitation, which mainly falls in summer, is about 575.9 millimeters.