Average Rainfall for Iowa in May





The tables below give monthly averages for rainfall during May at cities, towns and lakes in Iowa.

Each place has a total for the amount of precipitation it usually receives this month. Most sites 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 rainfall 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 monthly precipitation in May
Days Place Inches Milli­metres
12 Burlington 4.9 123
13 Cedar Rapids 4.8 121
12 Clinton 3.9 100
12 Cresco 4.1 104
Davenport 4.3 108
13 Decorah 4.2 106
13 Dubuque 4.4 111
12 Iowa City 4.6 116
12 Keokuk 5.2 131
12 Waterloo 4.5 115

Central Iowa

May averages for total rainfall
Days Place Inches Milli­metres
12 Ames 4.8 122
13 Des Moines 4.7 120
13 Fort Dodge 4.8 121
12 Marshalltown 4.7 120
12 Mason City 4.7 119
12 Ottumwa 4.7 120
13 Rathbun Lake Dam 5.1 128

Western Iowa

Average amount of rain in May
Days Place Inches Milli­metres
12 Carroll 4.4 111
11 Lake Park 4.0 102
10 Milford 3.8 97
10 Onawa 4.3 109
12 Shenandoah 5.8 146
11 Sioux City 3.7 95
11 Storm Lake 4.6 116
Reference

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

Iowa Precipitation
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