Climate - Normal - Illinois
| Jan | Feb | March | April | May | June | |
|---|---|---|---|---|---|---|
| Average high in °F | 31 | 36 | 48 | 61 | 73 | 83 |
| Average low in °F | 14 | 18 | 29 | 40 | 51 | 61 |
| Av. precipitation - inch | 1.73 | 1.69 | 2.87 | 3.82 | 4.53 | 3.9 |
| July | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Average high in °F | 86 | 84 | 77 | 65 | 49 | 36 |
| Average low in °F | 65 | 63 | 54 | 42 | 31 | 20 |
| Av. precipitation - inch | 3.94 | 3.82 | 2.95 | 2.72 | 3.07 | 2.4 |
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Normal Climate Graph - Illinois Climate Chart
Totals and averages
| Annual average high temperature | 60.7 °F |
| Annual average low temperature | 40.5 °F |
| Average temperature | 50.6 °F |
| Average annual precipitation | 37.4 in. |