| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°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 Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 69e - Cumberland Mountain Thrust Block |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 40831 - Harlan, KY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 33 | 40 | 50 | 59 | 63 | 62 | 55 | 43 | 34 | 27 | 43 |
| Avg Max Temp (°F) | 45 | 49 | 59 | 68 | 76 | 82 | 86 | 85 | 79 | 69 | 58 | 49 | 67 |
| Avg Precip (In.) | 4.35 | 3.9 | 4.88 | 4.16 | 5.3 | 4.57 | 4.65 | 4.37 | 3.16 | 3.24 | 4.1 | 4.38 | 51.05 |