Sheldon, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 61.3 °F (high). Annual precipitation averages 39.4 Inches. 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 | 16.7 °F | 32.4 °F | 2.22 in. |
| February | 19.6 °F | 37.1 °F | 1.93 in. |
| March | 29.2 °F | 48.8 °F | 2.56 in. |
| April | 39.2 °F | 62.5 °F | 3.85 in. |
| May | 50.8 °F | 73.4 °F | 4.29 in. |
| June | 60.4 °F | 82.1 °F | 5.0 in. |
| July | 63.5 °F | 84.5 °F | 4.65 in. |
| August | 61.1 °F | 83.1 °F | 3.55 in. |
| September | 53.4 °F | 78.5 °F | 3.16 in. |
| October | 42.2 °F | 65.8 °F | 3.28 in. |
| November | 31.7 °F | 50.1 °F | 2.67 in. |
| December | 22.3 °F | 37.5 °F | 2.26 in. |
| Annual | 40.8 °F | 61.3 °F | 39.42 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |