Glenville, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 5.1 °C (low) to 18.5 °C (high). Annual precipitation averages 1210.3 Millimeters. Glenville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6 °C | 5.1 °C | 88.39 mm |
| February | -5 °C | 7.1 °C | 82.55 mm |
| March | -1.6 °C | 12.3 °C | 110.49 mm |
| April | 3.9 °C | 19.8 °C | 97.03 mm |
| May | 9.7 °C | 24.2 °C | 127.76 mm |
| June | 14.4 °C | 27.8 °C | 121.16 mm |
| July | 17 °C | 29.6 °C | 131.32 mm |
| August | 16.1 °C | 29.2 °C | 104.39 mm |
| September | 12.1 °C | 26.2 °C | 91.44 mm |
| October | 5.2 °C | 20 °C | 84.33 mm |
| November | -0.6 °C | 13.2 °C | 79.5 mm |
| December | -3.5 °C | 7.4 °C | 91.95 mm |
| Annual | 5.1 °C | 18.5 °C | 1210.31 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Cfa - Humid Subtropical Climate |