Iowa climate
World Climates covers 3 places in Iowa. By annual mean temperature, the warmest is Davenport (10 °C51 °F) and the coolest is Cedar Rapids (9 °C49 °F). The wettest is Davenport with 924 mm36 in of precipitation per year, the driest Des Moines with 884 mm35 in.
The most common climate types (Köppen classification computed from these averages) are hot-summer humid continental (Dfa, 3 places).
The highest monthly average high is in Des Moines (31 °C87 °F in July); the lowest monthly average low is in Cedar Rapids (−11 °C12 °F in January).
Across the places in Iowa, the months that most often rank as the most comfortable are May, August and September (1, 1 and 3 of 3 places respectively).
Frequently asked questions
Which is the warmest place in Iowa?
By annual mean temperature, the warmest place in Iowa is Davenport at 10 °C51 °F. The coolest is Cedar Rapids at 9 °C49 °F.
Where does it rain the most in Iowa?
Davenport gets the most precipitation, 924 mm36 in in an average year. The driest place is Des Moines with 884 mm35 in.
How many places in Iowa does this site cover?
World Climates has climate data for 3 places in Iowa. Each one has a page with monthly averages for temperature, rainfall, humidity and daylight.
When is the best time to visit Iowa?
It depends on the place. Across Iowa, the months that most often rank as the most comfortable are May, August and September. Check the page of each city for its own best months.
Climate of every place in Iowa
| Place | Year | Max high | Min low | Precip. |
|---|---|---|---|---|
| Des Moines | 10 | 31 | −10 | 884 |
| Cedar Rapids | 9 | 29 | −11 | 922 |
| Davenport | 10 | 30 | −10 | 924 |
Year = annual mean temperature; max high = average high of the warmest month; min low = average low of the coldest month; precip. = annual total. Temperatures in °C°F, precipitation in mminches. Sorted by population.
Data: NASA POWER climatology 2001–2025 (MERRA-2 reanalysis, CERES satellite data) — grid-cell averages, not station records. Sources and method.