What travelers say
As per the 2000 census, the population of Ottumwa was 24,998.
The warmest month in Ottumwa is August when the temperature varies from 68.3 to 87.7 degrees Fahrenheit. December is the coolest month and the temperature alters from 16.3 to 32.1 degrees Fahrenheit. The average annual precipitation is 46.77 inches.
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