Average Annual Precipitation for Iowa

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The tables below give yearly averages for rainfall plus snowfall at cities, towns and lakes in Iowa.

Each place has a total for the amount of precipitation it usually receives in a year. Most locations also have information on the number of days with wet weather. That includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The annual precipitation totals are averages based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center.

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

Eastern Iowa

Average yearly precipitation
Days Place Inches Millimetres
114 Burlington 38.5 977
121 Cedar Rapids 37.6 955
117 Clinton 34.6 879
110 Cresco 36.4 925
  – Davenport 36.0 915
109 Decorah 34.7 881
115 Dubuque 36.3 921
108 Iowa City 37.6 955
104 Keokuk 39.2 996
112 Waterloo 34.6 878

Central Iowa

Annual averages for rainfall plus snowfall
Days Place Inches Millimetres
102 Ames 35.8 910
113 Des Moines 36.0 915
101 Fort Dodge 35.6 905
100 Marshalltown 37.4 949
112 Mason City 35.2 894
112 Ottumwa 37.1 942
108 Rathbun Lake Dam 38.9 988

Western Iowa

Average amount of rain and snow a year
Days Place Inches Millimetres
100 Carroll 34.3 871
  92 Lake Park 30.4 773
  89 Milford 29.6 752
  80 Onawa 30.5 775
  95 Shenandoah 36.3 923
101 Sioux City 27.7 705
  86 Storm Lake 34.7 881
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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