Weather history and climate summary information is available for the following locations:
- Belleville
- Chicago
- Moline
- Peoria
- Springfield
Warmest June Days
The warmest June days in Illinois are:
| Belleville, Illinois | 2012 | 106°F |
| Peoria, Illinois | 1988 | 105.1°F |
| Moline, Illinois | 1988 | 104°F |
| Belleville, Illinois | 1952 | 104°F |
| Chicago, Illinois | 1988 | 104°F |
Coldest June Days
The coldest June days in Illinois were:
| Chicago, Illinois | 1963 | 36.3°F |
| Chicago, Illinois | 1993 | 37.9°F |
| Chicago, Illinois | 2003 | 37.9°F |
| Chicago, Illinois | 1992 | 37.9°F |
| Springfield, Illinois | 2003 | 39°F |
Wettest June Days
The wettest single days in June occurred:
| Springfield, Illinois | 1973 | 8 inches |
| Chicago, Illinois | 1976 | 4.6 inches |
| Springfield, Illinois | 1990 | 4 inches |
| Moline, Illinois | 1993 | 3.7 inches |
| Moline, Illinois | 1983 | 3.6 inches |