Medora, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7 °C (low) to 17.9 °C (high). Annual precipitation averages 1032.3 Millimeters. Medora 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.2 °C | 2.7 °C | 62.23 mm |
| February | -4.4 °C | 5.8 °C | 53.85 mm |
| March | 0.8 °C | 11.8 °C | 81.03 mm |
| April | 6.6 °C | 18.5 °C | 115.06 mm |
| May | 12.8 °C | 23.8 °C | 130.56 mm |
| June | 17.8 °C | 28.6 °C | 95.5 mm |
| July | 19.5 °C | 30.3 °C | 88.39 mm |
| August | 18.4 °C | 29.8 °C | 92.2 mm |
| September | 13.6 °C | 26.4 °C | 83.82 mm |
| October | 7.4 °C | 19.9 °C | 83.06 mm |
| November | 1.6 °C | 11.9 °C | 80.52 mm |
| December | -3.4 °C | 5.4 °C | 66.04 mm |
| Annual | 7 °C | 17.9 °C | 1032.26 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |