| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F 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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 68c - Plateau Escarpment |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 40456 - Mount Vernon, KY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 34 | 42 | 52 | 61 | 65 | 63 | 56 | 44 | 36 | 28 | 44 |
| Avg Max Temp (°F) | 42 | 47 | 57 | 66 | 75 | 82 | 86 | 85 | 79 | 68 | 57 | 46 | 66 |
| Avg Precip (In.) | 4.27 | 3.83 | 5 | 4.18 | 5.49 | 4.72 | 4.62 | 3.93 | 3.83 | 3.24 | 4.2 | 4.79 | 52.1 |