Roodhouse, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.8 °F (low) to 63.2 °F (high). Annual precipitation averages 39.9 Inches. Roodhouse is located in USDA Plant Hardiness Zone 6a. 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 | 18.6 °F | 35.5 °F | 2.14 in. |
| February | 22.1 °F | 40.7 °F | 2.05 in. |
| March | 31.4 °F | 51.9 °F | 2.94 in. |
| April | 41.7 °F | 64.1 °F | 4.32 in. |
| May | 53.2 °F | 74.1 °F | 4.9 in. |
| June | 62.5 °F | 82.7 °F | 4.78 in. |
| July | 65.7 °F | 85.7 °F | 3.88 in. |
| August | 63.4 °F | 84.7 °F | 3.34 in. |
| September | 54.9 °F | 79.1 °F | 3.13 in. |
| October | 43.4 °F | 66.8 °F | 3.01 in. |
| November | 33.0 °F | 52.5 °F | 3.1 in. |
| December | 23.8 °F | 40.4 °F | 2.35 in. |
| Annual | 42.8 °F | 63.2 °F | 39.94 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |