Ripley, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 17.3 °C (high). Annual precipitation averages 991.6 Millimeters. Ripley 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 | -7.6 °C | 1.7 °C | 50.04 mm |
| February | -5.7 °C | 4.4 °C | 49.02 mm |
| March | -0.4 °C | 10.9 °C | 63.75 mm |
| April | 5.3 °C | 17.9 °C | 100.08 mm |
| May | 11.4 °C | 23.4 °C | 125.48 mm |
| June | 16.7 °C | 28.2 °C | 118.87 mm |
| July | 18.6 °C | 30.2 °C | 97.54 mm |
| August | 17 °C | 29.4 °C | 91.95 mm |
| September | 12.6 °C | 26.2 °C | 89.41 mm |
| October | 6.1 °C | 19.3 °C | 80.01 mm |
| November | 0.3 °C | 11.4 °C | 71.37 mm |
| December | -4.6 °C | 4.4 °C | 54.1 mm |
| Annual | 5.8 °C | 17.3 °C | 991.62 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 |