South Dakota has a continental climate with four distinct seasons, ranging from very cold, dry winters to hot and semi-humid summers. During the summers, the average high temperature throughout the state is often close to 90 °F (32 °C), although it generally cools down to near 60 °F (15 °C) at night.

In 2000, 658,245 South Dakotans—93.5% of the resident population five years of age or older—spoke only English at home.

The United States dollar, denoted by USD or the symbol $, is the official currency used in the United States. Commonly referred to as the "American dollar," the currency is divided into 100 cents (symbol ˘)

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According to the U.S. Census Bureau, as of 2009, South Dakota has an estimated population of 812,383, an increase of 57,548, or 7.6%, since the year 2000.[68] 7.3% of South Dakota's population were reported as under 5, 24.7% under 18, and 14.4% were 65 or older.

Pierre is the capital of the U.S. state of South Dakota and the county seat of Hughes County.[5] The population was 13,646 at the 2010 census, making it the second least populous state capital after Montpelier, Vermont.