Paris, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 62.6 °F (high). Annual precipitation averages 42.8 Inches. Paris is located in USDA Plant Hardiness Zone 6a. 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 | 19.1 °F | 35.2 °F | 2.83 in. |
| February | 22.3 °F | 40.0 °F | 2.48 in. |
| March | 31.5 °F | 51.2 °F | 3.03 in. |
| April | 42.0 °F | 63.5 °F | 4.77 in. |
| May | 53.4 °F | 73.7 °F | 4.38 in. |
| June | 62.4 °F | 82.2 °F | 5.05 in. |
| July | 64.7 °F | 84.8 °F | 4.05 in. |
| August | 62.8 °F | 83.8 °F | 3.17 in. |
| September | 55.1 °F | 78.7 °F | 3.07 in. |
| October | 43.7 °F | 66.5 °F | 3.66 in. |
| November | 33.3 °F | 51.9 °F | 3.59 in. |
| December | 24.6 °F | 39.8 °F | 2.76 in. |
| Annual | 42.9 °F | 62.6 °F | 42.84 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |