Paris, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 17 °C (high). Annual precipitation averages 1088.1 Millimeters. 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 | -7.2 °C | 1.8 °C | 71.88 mm |
| February | -5.4 °C | 4.4 °C | 62.99 mm |
| March | -0.3 °C | 10.7 °C | 76.96 mm |
| April | 5.6 °C | 17.5 °C | 121.16 mm |
| May | 11.9 °C | 23.2 °C | 111.25 mm |
| June | 16.9 °C | 27.9 °C | 128.27 mm |
| July | 18.2 °C | 29.3 °C | 102.87 mm |
| August | 17.1 °C | 28.8 °C | 80.52 mm |
| September | 12.8 °C | 25.9 °C | 77.98 mm |
| October | 6.5 °C | 19.2 °C | 92.96 mm |
| November | 0.7 °C | 11.1 °C | 91.19 mm |
| December | -4.1 °C | 4.3 °C | 70.1 mm |
| Annual | 6.1 °C | 17 °C | 1088.13 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |