| # | City | Average annual temperature |
|---|---|---|
| 1 | Mason City | 45.7°F |
| 2 | Spencer | 46.1°F |
| 3 | Fort Dodge | 46.5°F |
| 4 | Le Mars | 46.9°F |
| 5 | Storm Lake | 47.1°F |
| 6 | Grinnell | 47.4°F |
| 7 | Marshalltown | 47.7°F |
| 8 | Sioux City | 48.0°F |
| 9 | Boone | 48.1°F |
| 10 | Carroll | 48.2°F |
| 11 | Dubuque | 48.3°F |
| 12 | Decorah | 48.4°F |
| 13 | Newton | 48.5°F |
| 14 | Ames | 48.6°F |
| 15 | Cedar Falls | 49.0°F |
| 16 | Waterloo | 49.0°F |
| 17 | Waverly | 49.0°F |
| 18 | Atlantic | 49.3°F |
| 19 | Ankeny | 49.6°F |
| 20 | Fairfield | 49.8°F |
| 21 | Cedar Rapids | 49.9°F |
| 22 | Clinton | 49.9°F |
| 23 | Indianola | 49.9°F |
| 24 | Marion | 49.9°F |
| 25 | Oskaloosa | 50.0°F |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals, nearest station with complete data. Only cities covered by GIS Map with at least 1,000 residents are ranked. Estimates carry margins of error.
Citing this page: GIS Map, “Coldest Cities in Iowa”, https://gismap.land/rankings/iowa/coldest-cities. Figures from NOAA NCEI 1991-2020 U.S. Climate Normals, nearest station with complete data.
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