Wadsworth, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40 °F (low) to 57 °F (high). Annual precipitation averages 37.5 Inches. 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 | 15.3 °F | 30.0 °F | 1.96 in. |
| February | 18.0 °F | 33.4 °F | 2.05 in. |
| March | 27.2 °F | 43.4 °F | 2.29 in. |
| April | 37.4 °F | 55.3 °F | 3.9 in. |
| May | 47.8 °F | 66.7 °F | 4.33 in. |
| June | 58.0 °F | 76.7 °F | 4.36 in. |
| July | 63.4 °F | 81.5 °F | 3.64 in. |
| August | 62.3 °F | 80.1 °F | 3.56 in. |
| September | 54.6 °F | 73.4 °F | 3.56 in. |
| October | 42.9 °F | 60.8 °F | 3.2 in. |
| November | 31.7 °F | 47.2 °F | 2.45 in. |
| December | 21.4 °F | 35.5 °F | 2.18 in. |
| Annual | 40 °F | 57 °F | 37.48 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |