Climate - Alton - Illinois
| Jan | Feb | March | April | May | June | |
|---|---|---|---|---|---|---|
| Average high in °F | 36 | 42 | 53 | 64 | 75 | 84 |
| Average low in °F | 19 | 24 | 34 | 45 | 55 | 64 |
| Av. precipitation - inch | 2.01 | 2.28 | 3.46 | 4.17 | 4.25 | 3.23 |
| July | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Average high in °F | 88 | 86 | 79 | 67 | 53 | 41 |
| Average low in °F | 69 | 66 | 58 | 46 | 35 | 25 |
| Av. precipitation - inch | 3.5 | 3.19 | 3.15 | 2.72 | 3.74 | 2.91 |
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Alton Climate Graph - Illinois Climate Chart
Totals and averages
| Annual average high temperature | 64.0 °F |
| Annual average low temperature | 45.0 °F |
| Average temperature | 54.5 °F |
| Average annual precipitation | 38.6 in. |