Coulterville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.7 °C (low) to 18.7 °C (high). Annual precipitation averages 1141.5 Millimeters. Coulterville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5 °C | 4.2 °C | 71.37 mm |
| February | -3.2 °C | 7 °C | 65.28 mm |
| March | 1.5 °C | 12.7 °C | 93.98 mm |
| April | 7.3 °C | 19.1 °C | 126.75 mm |
| May | 13.3 °C | 24.2 °C | 133.35 mm |
| June | 18.1 °C | 29.2 °C | 117.09 mm |
| July | 20.1 °C | 30.9 °C | 107.7 mm |
| August | 18.7 °C | 30.3 °C | 80.77 mm |
| September | 14.2 °C | 26.8 °C | 82.8 mm |
| October | 8.1 °C | 20.7 °C | 83.82 mm |
| November | 2.2 °C | 12.7 °C | 101.35 mm |
| December | -2.4 °C | 6.5 °C | 77.22 mm |
| Annual | 7.7 °C | 18.7 °C | 1141.48 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |