Climate - Charleston - Illinois
| Jan | Feb | March | April | May | June | |
|---|---|---|---|---|---|---|
| Average high in °F | 35 | 41 | 53 | 65 | 76 | 85 |
| Average low in °F | 19 | 24 | 33 | 42 | 52 | 61 |
| Av. precipitation - inch | 2.2 | 2.4 | 3.35 | 3.98 | 4.21 | 3.94 |
| July | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Average high in °F | 88 | 86 | 79 | 68 | 53 | 40 |
| Average low in °F | 65 | 63 | 56 | 45 | 34 | 24 |
| Av. precipitation - inch | 4.65 | 3.46 | 3.19 | 3.27 | 3.86 | 3.23 |
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Charleston Climate Graph - Illinois Climate Chart
Totals and averages
| Annual average high temperature | 63.9 °F |
| Annual average low temperature | 43.2 °F |
| Average temperature | 53.5 °F |
| Average annual precipitation | 41.7 in. |