Ellsworth, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 16.1 °C (high). Annual precipitation averages 969.8 Millimeters. Ellsworth is located in USDA Plant Hardiness Zone 6a. 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 | -8.6 °C | 0.1 °C | 56.9 mm |
| February | -6.9 °C | 2.7 °C | 48.26 mm |
| March | -1.8 °C | 9.3 °C | 66.29 mm |
| April | 4.4 °C | 16.7 °C | 93.22 mm |
| May | 11.1 °C | 22.8 °C | 112.27 mm |
| June | 16.5 °C | 27.6 °C | 109.73 mm |
| July | 18 °C | 29.2 °C | 101.85 mm |
| August | 16.7 °C | 28.2 °C | 87.88 mm |
| September | 12.4 °C | 25.4 °C | 85.34 mm |
| October | 6.1 °C | 18.3 °C | 84.58 mm |
| November | -0.3 °C | 9.9 °C | 68.07 mm |
| December | -5.7 °C | 2.9 °C | 55.37 mm |
| Annual | 5.2 °C | 16.1 °C | 969.76 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |