Wadsworth, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.4 °C (low) to 13.9 °C (high). Annual precipitation averages 952 Millimeters. Wadsworth 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.3 °C | -1.1 °C | 49.78 mm |
| February | -7.8 °C | 0.8 °C | 52.07 mm |
| March | -2.7 °C | 6.3 °C | 58.17 mm |
| April | 3 °C | 12.9 °C | 99.06 mm |
| May | 8.8 °C | 19.3 °C | 109.98 mm |
| June | 14.4 °C | 24.8 °C | 110.74 mm |
| July | 17.4 °C | 27.5 °C | 92.46 mm |
| August | 16.8 °C | 26.7 °C | 90.42 mm |
| September | 12.6 °C | 23 °C | 90.42 mm |
| October | 6.1 °C | 16 °C | 81.28 mm |
| November | -0.2 °C | 8.4 °C | 62.23 mm |
| December | -5.9 °C | 1.9 °C | 55.37 mm |
| Annual | 4.4 °C | 13.9 °C | 951.98 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |