Weather history and climate summary information is available for the following locations:
- Belleville
- Chicago
- Moline
- Peoria
- Springfield
Warmest March Days
The warmest March days in Illinois are:
| Chicago, Illinois | 1986 | 88°F |
| Moline, Illinois | 1986 | 88°F |
| Belleville, Illinois | 1997 | 87.8°F |
| Chicago, Illinois | 2012 | 87.1°F |
| Belleville, Illinois | 1985 | 87.1°F |
Coldest March Days
The coldest March days in Illinois were:
| Moline, Illinois | 2002 | -8°F |
| Chicago, Illinois | 1962 | -8°F |
| Moline, Illinois | 1978 | -7.1°F |
| Chicago, Illinois | 2002 | -7.1°F |
| Springfield, Illinois | 1978 | -6.2°F |
Wettest March Days
The wettest single days in March occurred:
| Chicago, Illinois | 1981 | 7.1 inches |
| Moline, Illinois | 1973 | 5.1 inches |
| Chicago, Illinois | 1973 | 4.7 inches |
| Springfield, Illinois | 1973 | 4 inches |
| Peoria, Illinois | 1973 | 3.9 inches |