| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 71b - Mitchell Plain |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 40121 - Fort Knox, KY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 26 | 34 | 43 | 52 | 61 | 65 | 63 | 56 | 44 | 36 | 27 | 44 |
| Avg Max Temp (°F) | 42 | 48 | 58 | 69 | 77 | 85 | 88 | 87 | 81 | 71 | 57 | 47 | 67 |
| Avg Precip (In.) | 3.53 | 3.75 | 4.47 | 4.3 | 5 | 4.22 | 4.43 | 3.58 | 3.44 | 3.01 | 4.08 | 4.42 | 48.22 |