Windham is located in Rockingham county New hampshire with a geographic area of square miles. The total population in Windham is 14,694 with 50.9% male and 49.1% female. Children under age 5 represent 5.8% of the population, under age 18 equal 27.1% of the population and over age 65 is 16.0% of the population. The median household income is $154,032, per capita income is $62,702. There are a total of 5,024 housing units with 93.5% owner occupied. Education includes 8.3% of residents that are high school graduates and 61.9% with a bachelor's degree or higher. The average temperature in Windham in the summer is 68 degrees, and in the winter 23 degrees.