Eddyville, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.8 °F (low) to 67.4 °F (high). Annual precipitation averages 50.6 Inches. Eddyville is located in USDA Plant Hardiness Zone 7a. 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 | 24.5 °F | 43.1 °F | 3.89 in. |
| February | 27.8 °F | 47.5 °F | 3.49 in. |
| March | 35.1 °F | 56.4 °F | 4.69 in. |
| April | 45.5 °F | 68.3 °F | 5.33 in. |
| May | 54.7 °F | 76.8 °F | 5.26 in. |
| June | 63.0 °F | 85.0 °F | 4.57 in. |
| July | 66.5 °F | 87.9 °F | 4.32 in. |
| August | 64.4 °F | 87.2 °F | 3.15 in. |
| September | 56.8 °F | 81.8 °F | 3.49 in. |
| October | 45.2 °F | 70.7 °F | 3.72 in. |
| November | 36.5 °F | 57.6 °F | 4.36 in. |
| December | 29.2 °F | 46.6 °F | 4.32 in. |
| Annual | 45.8 °F | 67.4 °F | 50.59 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |