Storm lake is located in Buena vista county Iowa with a geographic area of 5.4 square miles. The total population in Storm lake is 10,508 with 50.0% male and 50.0% female. Children under age 5 represent 8.3% of the population, under age 18 equal 26.8% of the population and over age 65 is 10.5% of the population. The median household income is $47,943, per capita income is $21,180. There are a total of 3,817 housing units with 50.8% owner occupied. Education includes 26.6% of residents that are high school graduates and 18.4% with a bachelor's degree or higher. The average temperature in Storm lake in the summer is 70 degrees, and in the winter 23 degrees.