Welch, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 5.9 °C (low) to 18.6 °C (high). Annual precipitation averages 1149.9 Millimeters. Welch is located in USDA Plant Hardiness Zone 7a. 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 | -4.9 °C | 6.1 °C | 85.85 mm |
| February | -3.7 °C | 8.3 °C | 81.53 mm |
| March | -0.5 °C | 12.9 °C | 102.36 mm |
| April | 4.6 °C | 19.8 °C | 113.03 mm |
| May | 10.1 °C | 23.8 °C | 117.6 mm |
| June | 15 °C | 27.4 °C | 113.79 mm |
| July | 17.3 °C | 29.2 °C | 124.97 mm |
| August | 16.8 °C | 28.7 °C | 100.08 mm |
| September | 12.8 °C | 25.8 °C | 80.77 mm |
| October | 5.9 °C | 19.7 °C | 70.87 mm |
| November | 0.1 °C | 13.3 °C | 67.56 mm |
| December | -2.9 °C | 7.9 °C | 91.44 mm |
| Annual | 5.9 °C | 18.6 °C | 1149.85 mm |
| 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |