Sheldon, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16.3 °C (high). Annual precipitation averages 1001.3 Millimeters. Sheldon is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.5 °C | 0.2 °C | 56.39 mm |
| February | -6.9 °C | 2.8 °C | 49.02 mm |
| March | -1.6 °C | 9.3 °C | 65.02 mm |
| April | 4 °C | 16.9 °C | 97.79 mm |
| May | 10.4 °C | 23 °C | 108.97 mm |
| June | 15.8 °C | 27.8 °C | 127 mm |
| July | 17.5 °C | 29.2 °C | 118.11 mm |
| August | 16.2 °C | 28.4 °C | 90.17 mm |
| September | 11.9 °C | 25.8 °C | 80.26 mm |
| October | 5.7 °C | 18.8 °C | 83.31 mm |
| November | -0.2 °C | 10.1 °C | 67.82 mm |
| December | -5.4 °C | 3.1 °C | 57.4 mm |
| Annual | 4.9 °C | 16.3 °C | 1001.26 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |