| 2023 Hardiness Zone: | 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 |
| 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: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 70a - Permian Hills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 26170 - Saint Marys, WV | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 30 | 38 | 48 | 57 | 62 | 61 | 54 | 41 | 33 | 25 | 41 |
| Avg Max Temp (°F) | 40 | 44 | 55 | 65 | 74 | 82 | 85 | 83 | 77 | 67 | 55 | 44 | 64 |
| Avg Precip (In.) | 3.28 | 2.92 | 3.67 | 3.44 | 4.35 | 4.18 | 4.42 | 4.17 | 3.15 | 2.78 | 3.33 | 3.24 | 42.93 |