Fairmont, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.9 °F (low) to 63.6 °F (high). Annual precipitation averages 48.1 Inches. Fairmont is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.6 °F | 39.2 °F | 3.69 in. |
| February | 23.4 °F | 42.4 °F | 3.28 in. |
| March | 29.8 °F | 52.0 °F | 4.06 in. |
| April | 39.7 °F | 65.7 °F | 4.02 in. |
| May | 49.7 °F | 74.2 °F | 4.91 in. |
| June | 58.5 °F | 81.4 °F | 4.75 in. |
| July | 62.8 °F | 84.7 °F | 5.14 in. |
| August | 61.6 °F | 83.9 °F | 3.96 in. |
| September | 54.3 °F | 78.0 °F | 3.69 in. |
| October | 42.4 °F | 66.0 °F | 3.36 in. |
| November | 32.8 °F | 53.3 °F | 3.42 in. |
| December | 26.5 °F | 42.9 °F | 3.84 in. |
| Annual | 41.9 °F | 63.6 °F | 48.12 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |