| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F 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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 71a - Crawford-Mammoth Cave Uplands |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 42259 - Mammoth Cave, KY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 27 | 35 | 43 | 52 | 61 | 65 | 63 | 56 | 45 | 37 | 28 | 45 |
| Avg Max Temp (°F) | 43 | 49 | 59 | 70 | 78 | 85 | 89 | 88 | 82 | 71 | 58 | 48 | 68 |
| Avg Precip (In.) | 3.94 | 3.91 | 4.99 | 4.2 | 5.29 | 4.58 | 4.54 | 3.56 | 4.09 | 3.34 | 4.43 | 4.92 | 51.81 |