Arnold is located in Missouri. Arnold, Missouri has a population of 21,588. Arnold is less family-centric than the surrounding county with 29% households with children. The county percentage for households with children is 30%.
The median household income in Arnold, Missouri is $65,703. The median household income for the surrounding county is $66,915 compared to the national median of $66,222. The median age of people living in Arnold is 40.9 years.
The average high temperature in July is 88.2 degrees, with an average low temperature in January of 17.9 degrees. The annual precipitation is 41.75.