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Rainiest Cities in Illinois
Average annual precipitation, ranked
1991–2020 NOAA normals · 9 cities
Naperville is the rainiest city in Illinois, with 40.2 in of precipitation in an average year. Every Illinois city with a reporting NOAA station, ranked.
| # | 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.
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Normals and records: NOAA GHCN-Daily stations. Sunshine from ERA5 reanalysis. City locations: GeoNames (CC BY 4.0).