| # | City | Average annual temperature |
|---|---|---|
| 1 | Freeport | 47.7°F |
| 2 | Palatine | 47.9°F |
| 3 | Waukegan | 48.3°F |
| 4 | DeKalb | 48.5°F |
| 5 | Carpentersville | 49.0°F |
| 6 | Crystal Lake | 49.0°F |
| 7 | Elgin | 49.0°F |
| 8 | Lake in the Hills | 49.0°F |
| 9 | Downers Grove | 49.2°F |
| 10 | Lombard | 49.2°F |
| 11 | Naperville | 49.2°F |
| 12 | Wheaton | 49.2°F |
| 13 | Rockford | 49.3°F |
| 14 | Sterling | 49.4°F |
| 15 | Bartlett | 49.6°F |
| 16 | Evanston | 49.6°F |
| 17 | Glenview | 49.6°F |
| 18 | Hanover Park | 49.6°F |
| 19 | Hoffman Estates | 49.6°F |
| 20 | LaSalle | 49.6°F |
| 21 | Schaumburg | 49.6°F |
| 22 | Skokie | 49.6°F |
| 23 | Streamwood | 49.6°F |
| 24 | Carol Stream | 49.7°F |
| 25 | Calumet City | 49.8°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 Illinois”, https://gismap.land/rankings/illinois/coldest-cities. Figures from NOAA NCEI 1991-2020 U.S. Climate Normals, nearest station with complete data.
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