- Second: Kansas, Nebraska
- Third: Iowa, Wyoming
- Fourth: Colorado, South Dakota, Arkansas
- Fifth: Montana, Minnesota, Missouri
The national average precipitation of 4.15" was almost double the long-term October amount of 2.11". The East North Central and South regions both had their wettest Octobers, and the Central region had its second wettest. Three states had record wettest Octobers: Iowa, Arkansas, and Louisiana. Fourteen other states were ranked in the top five wettest for the month. Only three states had below-normal precipitation.
Images (click to enlarge): U.S. October average temperature since 1895, statewide temperature and precipitation ranks for October 2009; from National Climatic Data Center