Climate of Iowa, USA
Area-weighted average across Iowa. For where people actually live and travel, see the cities below.
Iowa, a subdivision of United States of America, has a strongly continental climate on average. Area-weighted monthly temperatures across the whole territory range from -7.9°C / 17.8°F in January to 23.2°C / 73.8°F in July, with rainfall from 23 mm / 0.9 in to 113 mm / 4.4 in depending on the season (848 mm / 33.4 in total across the year). See the city listed below for point-value climate at specific locations — these often differ from the area-weighted average, especially in geographically diverse subdivisions.
| Month | Temperature | Rainfall | Matches |
|---|---|---|---|
| January | -7.9°C17.8°F | 23 mm0.9″ | Snowy |
| February | -4.4°C24.1°F | 24 mm0.9″ | Snowy |
| March | 2.2°C36°F | 56 mm2.2″ | — |
| April | 9.4°C48.9°F | 82 mm3.2″ | — |
| May | 15.9°C60.6°F | 103 mm4.1″ | — |
| June | 21.1°C70°F | 113 mm4.4″ | — |
| July | 23.2°C73.8°F | 105 mm4.1″ | — |
| August | 21.9°C71.4°F | 103 mm4.1″ | — |
| September | 17.4°C63.3°F | 95 mm3.7″ | — |
| October | 10.8°C51.4°F | 65 mm2.6″ | — |
| November | 2.2°C36°F | 47 mm1.9″ | — |
| December | -5°C23°F | 32 mm1.3″ | Snowy |
Frequently asked questions
What is the best time to visit Iowa?
Iowa, United States of America does not have a clear sunny-and-dry window by our cutoffs. The warmest month is July at 23.2°C / 73.8°F, and the driest is January at 23 mm / 0.9 in — likely your best travel window. For city-level detail, see the cities section below.
What is the climate of Iowa?
Iowa, United States of America has area-weighted monthly average temperatures ranging from -7.9°C / 17.8°F in January to 23.2°C / 73.8°F in July. Annual rainfall averages about 848 mm / 33.4 in, with the wettest month being June (113 mm / 4.4 in) and the driest January (23 mm / 0.9 in). Because this is an area average across the whole subdivision, local city values can differ substantially.
What is the hottest month in Iowa?
The hottest month in Iowa is July, with an area-wide average temperature of 23.2°C / 73.8°F.
What is the coldest month in Iowa?
The coldest month in Iowa is January, with an area-wide average temperature of -7.9°C / 17.8°F.
When does it rain most in Iowa?
The wettest month in Iowa is June, averaging about 113 mm / 4.4 in of rainfall. The driest is January with about 23 mm / 0.9 in.