Iowa is a U.S. state in the Midwestern United States, bordered by the Mississippi River on the east and the Missouri River and the Big Sioux River on the west. Des Moines is the largest city in Iowa and the state’s political and economic center. English is the most common language used in Iowa, used by 94% of the population. Iowa has a humid continental climate throughout the state, with extremes of both heat and cold. Summers are known for heat and humidity, with daytime temperatures often near 32 °C.