| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F 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 Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 69c - Greenbriar Karst |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 24983 - Union, WV | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 28 | 36 | 45 | 54 | 58 | 57 | 50 | 37 | 29 | 22 | 38 |
| Avg Max Temp (°F) | 40 | 44 | 53 | 63 | 72 | 79 | 83 | 81 | 75 | 65 | 54 | 44 | 63 |
| Avg Precip (In.) | 2.63 | 2.6 | 3.3 | 3.33 | 4.09 | 3.48 | 3.74 | 3.19 | 3.22 | 2.6 | 2.63 | 2.4 | 37.22 |