Yorkville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.4 °F (low) to 59.9 °F (high). Annual precipitation averages 38.6 Inches. Yorkville is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.6 °F | 31.2 °F | 1.9 in. |
| February | 18.4 °F | 35.2 °F | 1.83 in. |
| March | 28.1 °F | 47.2 °F | 2.38 in. |
| April | 38.8 °F | 60.3 °F | 3.9 in. |
| May | 49.9 °F | 71.4 °F | 4.75 in. |
| June | 59.9 °F | 80.9 °F | 4.61 in. |
| July | 63.7 °F | 84.2 °F | 3.98 in. |
| August | 62.0 °F | 82.4 °F | 3.88 in. |
| September | 54.1 °F | 76.8 °F | 3.37 in. |
| October | 42.0 °F | 63.7 °F | 3.34 in. |
| November | 31.4 °F | 49.0 °F | 2.51 in. |
| December | 21.4 °F | 36.4 °F | 2.14 in. |
| Annual | 40.4 °F | 59.9 °F | 38.59 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 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 |