Average Rainfall for Iowa in July

The tables below give monthly averages for rainfall during July 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 July

Days	Place	Inches	Millimetres
10	Burlington	4.3	108
10	Cedar Rapids	4.6	117
10	Clinton	3.8	96
10	Cresco	4.6	116
–	Davenport	4.2	107
10	Decorah	4.3	108
9	Dubuque	4.8	121
9	Iowa City	4.6	116
9	Keokuk	4.3	108
10	Waterloo	4.9	125

Central Iowa

July averages for total rainfall

Days	Place	Inches	Millimetres
9	Ames	4.8	123
10	Des Moines	4.5	114
10	Fort Dodge	4.7	119
10	Marshalltown	5.0	127
10	Mason City	4.7	119
10	Ottumwa	4.5	114
11	Rathbun Lake Dam	5.6	141

Western Iowa

Average amount of rain in July

Days	Place	Inches	Millimetres
10	Carroll	5.0	127
9	Lake Park	3.8	96
9	Milford	3.7	94
8	Onawa	4.0	101
10	Shenandoah	4.6	118
10	Sioux City	3.4	87
9	Storm Lake	4.4	112