Clarksburg, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 17.8 °C (high). Annual precipitation averages 1224 Millimeters. Clarksburg is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6 °C | 4.4 °C | 92.71 mm |
| February | -5.2 °C | 6.2 °C | 88.39 mm |
| March | -1.6 °C | 11.6 °C | 106.68 mm |
| April | 3.9 °C | 19 °C | 100.58 mm |
| May | 9.4 °C | 23.6 °C | 122.68 mm |
| June | 14.3 °C | 27.7 °C | 119.38 mm |
| July | 16.8 °C | 29.3 °C | 135.38 mm |
| August | 16 °C | 28.7 °C | 104.9 mm |
| September | 11.9 °C | 25.4 °C | 89.15 mm |
| October | 5.1 °C | 18.8 °C | 84.33 mm |
| November | -0.3 °C | 12.3 °C | 83.06 mm |
| December | -3.6 °C | 6.7 °C | 96.77 mm |
| Annual | 5.1 °C | 17.8 °C | 1224.01 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |