Checked
Illinois Climate
1991 to 2020 normals at the weather station nearest each city.
Cities
Normal high and low in January and July, yearly precipitation and snow
| City | Station | Jan | Jul | Precip. | Snow |
|---|---|---|---|---|---|
| Chicago | Chicago Northerly Is (4 mi) | 32° / 20° | 81° / 67° | -- | -- |
| Aurora | Aurora (2 mi) | 31° / 16° | 84° / 65° | 39.47 in | 27.9 in |
| Naperville | Wheaton 3 SE (6 mi) | 33° / 17° | 86° / 63° | 39.90 in | 24.3 in |
| Joliet | Joliet Brandon Rd Dam (2 mi) | 31° / 17° | 84° / 64° | 38.03 in | 16.9 in |
| Rockford | Rockford Gtr Rockford AP (5 mi) | 29° / 15° | 84° / 64° | 37.24 in | 37.1 in |
| Elgin | Elgin (1 mi) | 30° / 14° | 84° / 63° | 39.85 in | 32.1 in |
| Springfield | Springfield #2 (3 mi) | 36° / 19° | 86° / 66° | 40.45 in | -- |
| Peoria | Peoria Gtr Peoria AP (7 mi) | 34° / 18° | 86° / 66° | 37.55 in | 26.2 in |
| Champaign | Champaign 3s (2 mi) | 34° / 18° | 85° / 65° | 40.92 in | 20.8 in |
| Waukegan | Waukegan (2 mi) | 30° / 16° | 82° / 63° | -- | -- |
| Cicero | Chicago Midway AP (4 mi) | 33° / 19° | 85° / 68° | 34.42 in | -- |
| Bloomington | Normal 4ne (5 mi) | 33° / 16° | 86° / 63° | 39.39 in | 20.1 in |
| Schaumburg | Streamwood (6 mi) | 32° / 14° | 87° / 61° | 38.02 in | 34.0 in |
| Evanston | Chicago Botanic Garden (8 mi) | 32° / 16° | 84° / 63° | 39.51 in | 33.6 in |
| Arlington Heights | Chicago Palwaukee AP (5 mi) | 32° / 18° | 84° / 66° | 32.28 in | -- |
| Bolingbrook | Romeoville WFO (6 mi) | 32° / 16° | 85° / 65° | 41.14 in | 33.2 in |
| Decatur | Decatur Wtp (2 mi) | 34° / 20° | 85° / 67° | 40.44 in | 13.6 in |
| Palatine | Barrington 3sw (6 mi) | 29° / 13° | 81° / 63° | 40.43 in | 38.5 in |
| Des Plaines | Chicago Ohare INTL AP (3 mi) | 32° / 19° | 85° / 66° | 37.86 in | 38.4 in |
| Orland Park | Little Red School Hse (7 mi) | 33° / 15° | 90° / 64° | 41.39 in | -- |
| Oak Lawn | Chicago Midway AP 3sw (3 mi) | 33° / 20° | 85° / 68° | 40.88 in | 38.8 in |
| Tinley Park | Park Forest (8 mi) | 31° / 15° | 84° / 64° | 42.10 in | 28.2 in |
| Downers Grove | Lisle-Morton Arboretum (3 mi) | 32° / 15° | 84° / 62° | 40.18 in | -- |
| Moline | Moline Quad City INTL AP (2 mi) | 32° / 15° | 86° / 65° | 38.27 in | 36.1 in |
| Belleville | Belleville Siu Rsch (8 mi) | 43° / 24° | 90° / 68° | 43.36 in | 11.2 in |