Summit is located in Roberts county South dakota with a geographic area of 0.5 square miles. The total population in Summit is 339 with 51.3% male and 48.7% female. Children under age 5 represent 9.7% of the population, under age 18 equal 36.6% of the population and over age 65 is 9.7% of the population. The median household income is $48,125, per capita income is $20,147. There are a total of 117 housing units with 65.0% owner occupied. Education includes 40.2% of residents that are high school graduates and 6.8% with a bachelor's degree or higher. The average temperature in Summit in the summer is 70 degrees, and in the winter 15 degrees.