| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| 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: | 69d - Dissected Appalachian Plateau |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 25661 - Williamson, WV | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 25 | 33 | 40 | 50 | 59 | 64 | 63 | 56 | 43 | 34 | 27 | 43 |
| Avg Max Temp (°F) | 44 | 49 | 59 | 70 | 77 | 85 | 88 | 87 | 81 | 70 | 58 | 49 | 68 |
| Avg Precip (In.) | 3.63 | 3.32 | 3.99 | 3.71 | 4.33 | 4.34 | 4.59 | 4.1 | 3.46 | 2.95 | 3.35 | 3.69 | 45.45 |