Mason, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.1 °F (low) to 65.8 °F (high). Annual precipitation averages 43.3 Inches. Mason 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 | 22.7 °F | 40.9 °F | 3.22 in. |
| February | 24.7 °F | 44.8 °F | 2.95 in. |
| March | 30.9 °F | 54.3 °F | 3.9 in. |
| April | 41.1 °F | 67.9 °F | 3.66 in. |
| May | 51.7 °F | 76.1 °F | 4.39 in. |
| June | 60.2 °F | 83.5 °F | 4.31 in. |
| July | 64.0 °F | 86.5 °F | 4.58 in. |
| August | 62.6 °F | 85.7 °F | 3.49 in. |
| September | 55.3 °F | 79.9 °F | 3.49 in. |
| October | 43.0 °F | 68.6 °F | 3.06 in. |
| November | 33.3 °F | 56.1 °F | 2.88 in. |
| December | 27.5 °F | 45.3 °F | 3.38 in. |
| Annual | 43.1 °F | 65.8 °F | 43.31 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 |