Nashville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.6 °F (low) to 65.4 °F (high). Annual precipitation averages 43.5 Inches. Nashville 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 | 22.6 °F | 39.1 °F | 2.68 in. |
| February | 25.9 °F | 44.1 °F | 2.35 in. |
| March | 34.5 °F | 54.4 °F | 3.44 in. |
| April | 45.0 °F | 66.4 °F | 4.8 in. |
| May | 55.8 °F | 75.5 °F | 5.02 in. |
| June | 64.4 °F | 84.4 °F | 4.97 in. |
| July | 67.7 °F | 87.5 °F | 3.98 in. |
| August | 65.5 °F | 86.5 °F | 3.06 in. |
| September | 57.3 °F | 80.4 °F | 3.46 in. |
| October | 46.0 °F | 69.1 °F | 3.21 in. |
| November | 35.5 °F | 54.5 °F | 3.7 in. |
| December | 27.1 °F | 43.3 °F | 2.82 in. |
| Annual | 45.6 °F | 65.4 °F | 43.49 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |