| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72j - Southern Illinoian Till Plain |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 62263 - Nashville, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 26 | 35 | 45 | 55 | 63 | 67 | 65 | 58 | 47 | 36 | 26 | 45 |
| Avg Max Temp (°F) | 38 | 44 | 55 | 66 | 76 | 85 | 88 | 87 | 80 | 69 | 54 | 42 | 65 |
| Avg Precip (In.) | 2.22 | 2.43 | 3.66 | 3.95 | 4.19 | 3.74 | 3.7 | 2.87 | 3.17 | 3.05 | 3.91 | 3.11 | 40 |