| # | City | Average annual temperature |
|---|---|---|
| 1 | Granite City | 58.0°F |
| 2 | Belleville | 57.6°F |
| 3 | O'Fallon | 57.6°F |
| 4 | Collinsville | 56.5°F |
| 5 | East St. Louis | 56.5°F |
| 6 | Carbondale | 55.9°F |
| 7 | Marion | 55.9°F |
| 8 | Alton | 55.7°F |
| 9 | Edwardsville | 55.7°F |
| 10 | Charleston | 55.0°F |
| 11 | Quincy | 53.7°F |
| 12 | Mattoon | 53.5°F |
| 13 | Decatur | 53.1°F |
| 14 | Springfield | 53.1°F |
| 15 | Danville | 53.0°F |
| 16 | Peoria | 52.6°F |
| 17 | Oak Lawn | 52.5°F |
| 18 | Champaign | 52.4°F |
| 19 | Champaign-Urbana | 52.4°F |
| 20 | Urbana | 52.4°F |
| 21 | Berwyn | 52.2°F |
| 22 | Chicago | 52.2°F |
| 23 | Cicero | 52.2°F |
| 24 | Oak Park | 52.2°F |
| 25 | Macomb | 51.6°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, “Warmest Cities in Illinois”, https://gismap.land/rankings/illinois/warmest-cities. Figures from NOAA NCEI 1991-2020 U.S. Climate Normals, nearest station with complete data.
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