Average Temperatures for Iowa in December





Average temperatures for December at cities, towns and other locations around Iowa are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for each region of the state: Eastern, Central and Western Iowa.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Eastern Iowa

Average December temperatures
High °F Low °F Place High °C Low °C
37 21 Burlington 3 -6
35 19 Cedar Rapids 2 -7
35 21 Clinton 1 -6
30 13 Cresco -1 -11
35 20 Davenport 2 -7
33 17 Decorah 0 -8
33 18 Dubuque 0 -8
34 18 Iowa City 1 -8
38 23 Keokuk 3 -5
34 17 Waterloo 1 -8

Central Iowa

Average daily temperatures in December
High °F Low °F Place High °C Low °C
34 18 Ames 1 -8
36 20 Des Moines 2 -7
31 14 Fort Dodge 0 -10
34 16 Marshalltown 1 -9
30 14 Mason City -1 -10
37 20 Ottumwa 3 -7
37 19 Rathbun Lake Dam 3 -7

Western Iowa

December temperatures: daily averages
High °F Low °F Place High °C Low °C
33 16 Carroll 1 -9
29 12 Lake Park -2 -11
29 13 Milford -2 -10
34 14 Onawa 1 -10
38 19 Shenandoah 3 -7
33 15 Sioux City 1 -10
29 13 Spirit Lake -2 -11
31 15 Storm Lake 0 -9
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Iowa Temperatures
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