Average annual precipitation, ranked
9 cities| # | City | Average annual precipitation | |
|---|---|---|---|
| 1 | Naperville | 40.2 in | wettest May |
| 2 | Elgin | 39.9 in | wettest May |
| 3 | Aurora | 39.5 in | wettest May |
| 4 | Joliet | 38.0 in | wettest July |
| 5 | Springfield | 38.0 in | wettest June |
| 6 | Peoria | 37.6 in | wettest May |
| 7 | North Peoria | 37.6 in | wettest May |
| 8 | Rockford | 37.2 in | wettest June |
| 9 | Chicago | 34.4 in | wettest May |
Thirty-year normals and records from each city's NOAA GHCN-Daily station, computed 2026-08-30. Cities with a population of 100,000 or more and a reporting station. Each city name opens its climate page.
