# Counties in Iowa by annual precipitation, 2025

All 99 values come from NOAA National Centers for Environmental Information for 2025, so the places are comparable.

- Indicator id: `precipitation_annual`
- Unit: inches
- Definition: Total precipitation from January to December, in inches: rain plus the water content of snow and other frozen precipitation. NOAA computes it from its climate divisional dataset (nClimDiv): station readings interpolated onto a 5 km grid and averaged over the area.
- Source: NOAA National Centers for Environmental Information, NOAA Climate at a Glance, January to December precipitation, counties (https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping)
- Publisher page: https://invokely.ai/en/publishers/noaa-ncei
- Retrieved: 2026-10-12
- Citation: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December precipitation, counties. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/annual-precipitation/iowa-counties

| Rank | Place | inches |
|---:|---|---:|
| 1 | Boone County | 41.79 |
| 2 | Story County | 41.66 |
| 3 | Hamilton County | 41.38 |
| 4 | Floyd County | 40.58 |
| 5 | Mitchell County | 40.45 |
| 6 | Franklin County | 40.26 |
| 6 | Hardin County | 40.26 |
| 8 | Worth County | 39.14 |
| 9 | Greene County | 39.09 |
| 10 | Howard County | 39.01 |
| 11 | Winnebago County | 38.96 |
| 12 | Cerro Gordo County | 38.84 |
| 13 | Butler County | 38.78 |
| 14 | Dallas County | 38.52 |
| 15 | Marshall County | 38.08 |
| 16 | Webster County | 37.88 |
| 17 | Polk County | 37.61 |
| 18 | Chickasaw County | 37.38 |
| 19 | Grundy County | 37.06 |
| 20 | Guthrie County | 37.05 |
| 21 | Delaware County | 36.94 |
| 22 | Wright County | 36.78 |
| 23 | Buchanan County | 36.74 |
| 24 | Bremer County | 36.15 |
| 25 | Muscatine County | 35.93 |
| 26 | Jasper County | 35.61 |
| 27 | Carroll County | 35.53 |
| 28 | Madison County | 35.42 |
| 29 | Black Hawk County | 35.27 |
| 30 | Hancock County | 35.19 |
| 31 | Poweshiek County | 34.87 |
| 32 | Cedar County | 34.74 |
| 33 | Harrison County | 34.58 |
| 34 | Clayton County | 34.45 |
| 35 | Crawford County | 34.34 |
| 36 | Winneshiek County | 34.28 |
| 37 | Humboldt County | 34.12 |
| 38 | Tama County | 34.07 |
| 39 | Adair County | 33.99 |
| 40 | Lee County | 33.91 |
| 41 | Louisa County | 33.82 |
| 42 | Calhoun County | 33.74 |
| 42 | Clarke County | 33.74 |
| 44 | Cherokee County | 33.71 |
| 45 | Scott County | 33.6 |
| 46 | Fayette County | 33.58 |
| 47 | Audubon County | 33.45 |
| 48 | Linn County | 33.03 |
| 49 | Shelby County | 32.97 |
| 50 | Union County | 32.9 |
| 51 | Monona County | 32.83 |
| 52 | Kossuth County | 32.82 |
| 53 | Ida County | 32.8 |
| 54 | Van Buren County | 32.75 |
| 55 | Decatur County | 32.7 |
| 56 | Benton County | 32.67 |
| 56 | Jefferson County | 32.67 |
| 58 | Clinton County | 32.6 |
| 59 | Appanoose County | 32.51 |
| 60 | Jones County | 32.39 |
| 61 | Jackson County | 32.36 |
| 62 | Henry County | 32.35 |
| 63 | Sac County | 32.3 |
| 64 | Wayne County | 32.27 |
| 65 | Keokuk County | 32.26 |
| 66 | Dubuque County | 32.12 |
| 67 | Warren County | 32.11 |
| 68 | Pocahontas County | 32.05 |
| 69 | Davis County | 31.9 |
| 70 | Des Moines County | 31.69 |
| 70 | Marion County | 31.69 |
| 72 | Washington County | 31.36 |
| 73 | Plymouth County | 31.26 |
| 74 | Iowa County | 31.25 |
| 75 | Buena Vista County | 31.22 |
| 76 | O'Brien County | 31.18 |
| 77 | Woodbury County | 30.93 |
| 78 | Ringgold County | 30.85 |
| 79 | Lucas County | 30.84 |
| 80 | Cass County | 30.81 |
| 81 | Clay County | 30.64 |
| 82 | Mahaska County | 30.58 |
| 83 | Dickinson County | 29.96 |
| 84 | Monroe County | 29.82 |
| 85 | Osceola County | 29.31 |
| 86 | Sioux County | 29.3 |
| 87 | Emmet County | 29.25 |
| 88 | Pottawattamie County | 29.23 |
| 89 | Adams County | 29.14 |
| 90 | Palo Alto County | 28.96 |
| 91 | Johnson County | 28.46 |
| 92 | Allamakee County | 28.33 |
| 93 | Wapello County | 28.18 |
| 94 | Fremont County | 27.57 |
| 95 | Taylor County | 27.48 |
| 96 | Montgomery County | 27.21 |
| 97 | Mills County | 26.92 |
| 98 | Lyon County | 25.96 |
| 99 | Page County | 25.71 |