Joy, 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 60.3 °F (high). Annual precipitation averages 37.2 Inches. Joy 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 | 14.6 °F | 30.8 °F | 1.47 in. |
| February | 18.0 °F | 35.3 °F | 1.74 in. |
| March | 28.7 °F | 48.5 °F | 2.45 in. |
| April | 39.6 °F | 61.6 °F | 3.66 in. |
| May | 51.5 °F | 72.3 °F | 4.86 in. |
| June | 61.3 °F | 81.5 °F | 4.77 in. |
| July | 64.9 °F | 84.8 °F | 3.87 in. |
| August | 62.5 °F | 82.8 °F | 3.91 in. |
| September | 54.4 °F | 76.6 °F | 3.55 in. |
| October | 42.6 °F | 63.8 °F | 2.79 in. |
| November | 30.8 °F | 49.0 °F | 2.26 in. |
| December | 20.6 °F | 36.2 °F | 1.9 in. |
| Annual | 40.8 °F | 60.3 °F | 37.23 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |