Grant Town, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 17.5 °C (high). Annual precipitation averages 1229.4 Millimeters. Grant Town 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 | -5.9 °C | 4.1 °C | 94.49 mm |
| February | -5.1 °C | 5.8 °C | 83.57 mm |
| March | -1.5 °C | 11.1 °C | 103.63 mm |
| April | 3.9 °C | 18.6 °C | 102.36 mm |
| May | 9.5 °C | 23.3 °C | 123.19 mm |
| June | 14.4 °C | 27.3 °C | 120.4 mm |
| July | 16.7 °C | 29.2 °C | 133.86 mm |
| August | 16.1 °C | 28.7 °C | 102.87 mm |
| September | 12.1 °C | 25.4 °C | 93.47 mm |
| October | 5.4 °C | 18.8 °C | 86.11 mm |
| November | 0.2 °C | 12 °C | 86.61 mm |
| December | -3.3 °C | 6.1 °C | 98.81 mm |
| Annual | 5.2 °C | 17.5 °C | 1229.37 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 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |