Climate - Mattoon - Illinois
| Jan | Feb | March | April | May | June | |
|---|---|---|---|---|---|---|
| Average high in °F | 33 | 39 | 50 | 62 | 73 | 83 |
| Average low in °F | 17 | 21 | 32 | 42 | 53 | 63 |
| Av. precipitation - inch | 2.05 | 2.09 | 3.07 | 3.86 | 3.94 | 4.21 |
| July | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Average high in °F | 86 | 84 | 78 | 66 | 51 | 38 |
| Average low in °F | 66 | 64 | 56 | 45 | 33 | 22 |
| Av. precipitation - inch | 4.17 | 3.27 | 3.07 | 3.03 | 3.7 | 2.83 |
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Mattoon Climate Graph - Illinois Climate Chart
Totals and averages
| Annual average high temperature | 61.9 °F |
| Annual average low temperature | 42.9 °F |
| Average temperature | 52.4 °F |
| Average annual precipitation | 39.3 in. |