Wellsburg, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 17.1 °C (high). Annual precipitation averages 1070.9 Millimeters. Wellsburg is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.7 °C | 3.3 °C | 84.84 mm |
| February | -4.8 °C | 4.9 °C | 65.28 mm |
| March | -1.1 °C | 10.3 °C | 84.58 mm |
| April | 4.4 °C | 17.6 °C | 95.76 mm |
| May | 10.2 °C | 23.1 °C | 106.17 mm |
| June | 15 °C | 27.3 °C | 111.25 mm |
| July | 17.5 °C | 29.1 °C | 106.68 mm |
| August | 16.7 °C | 28.4 °C | 91.95 mm |
| September | 12.9 °C | 25.2 °C | 89.15 mm |
| October | 6.5 °C | 18.7 °C | 80.52 mm |
| November | 1.1 °C | 11.6 °C | 75.44 mm |
| December | -2.6 °C | 5.7 °C | 79.25 mm |
| Annual | 5.8 °C | 17.1 °C | 1070.87 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |