Seaton, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 15.9 °C (high). Annual precipitation averages 954.6 Millimeters. Seaton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.4 °C | -0.4 °C | 39.12 mm |
| February | -7.5 °C | 2.1 °C | 45.47 mm |
| March | -1.6 °C | 9.2 °C | 62.74 mm |
| April | 4.5 °C | 16.6 °C | 94.49 mm |
| May | 11.1 °C | 22.6 °C | 123.95 mm |
| June | 16.5 °C | 27.7 °C | 119.89 mm |
| July | 18.5 °C | 29.6 °C | 99.82 mm |
| August | 17.2 °C | 28.5 °C | 97.79 mm |
| September | 12.7 °C | 25.1 °C | 92.46 mm |
| October | 6.1 °C | 17.9 °C | 71.63 mm |
| November | -0.4 °C | 9.7 °C | 58.42 mm |
| December | -6.1 °C | 2.5 °C | 48.77 mm |
| Annual | 5.1 °C | 15.9 °C | 954.55 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |