Climate - Mason City - Illinois
| Jan | Feb | March | April | May | June | |
|---|---|---|---|---|---|---|
| Average high in °F | 33 | 39 | 52 | 65 | 76 | 84 |
| Average low in °F | 16 | 21 | 31 | 40 | 51 | 60 |
| Av. precipitation - inch | 1.57 | 1.54 | 2.76 | 3.35 | 4.21 | 3.7 |
| July | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Average high in °F | 87 | 85 | 80 | 67 | 51 | 38 |
| Average low in °F | 64 | 62 | 55 | 44 | 32 | 21 |
| Av. precipitation - inch | 4.06 | 3.46 | 2.99 | 2.72 | 2.95 | 2.4 |
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Mason City Climate Graph - Illinois Climate Chart
Totals and averages
| Annual average high temperature | 63.1 °F |
| Annual average low temperature | 41.4 °F |
| Average temperature | 52.3 °F |
| Average annual precipitation | 35.7 in. |