Average Rainfall for Iowa in May





The tables below give monthly averages for rainfall during May at cities, communities and other locations around Iowa.

Each place has a total for the amount of precipitation it usually receives this month. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The rainfall totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

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
13 Burlington 5.2 131
13 Cedar Rapids 4.7 120
13 Clinton 4.4 112
13 Cresco 4.5 114
13 Davenport 4.8 122
13 Decorah 4.9 125
13 Dubuque 4.4 113
13 Iowa City 5.1 128
13 Keokuk 5.3 134
13 Waterloo 4.6 117

Central Iowa

May averages for total rainfall
Days Place Inches Milli­metres
13 Ames 5.0 127
13 Des Moines 5.2 133
13 Fort Dodge 4.6 116
13 Marshalltown 4.9 125
14 Mason City 5.2 131
13 Ottumwa 5.0 128

Western Iowa

Average amount of rain in May
Days Place Inches Milli­metres
13 Carroll 4.5 114
12 Lake Park 4.6 117
11 Milford 4.2 107
9 Onawa 4.6 116
12 Shenandoah 6.2 156
12 Sioux City 3.9 98
10 Spirit Lake 4.1 105
Reference

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

Iowa Precipitation
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