Frank, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 14.2 °C (high). Annual precipitation averages 1136.2 Millimeters. Frank is located in USDA Plant Hardiness Zone 6a. 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 | -8.4 °C | 1.7 °C | 91.44 mm |
| February | -7.5 °C | 3.6 °C | 78.23 mm |
| March | -3.9 °C | 8.2 °C | 101.09 mm |
| April | 1.3 °C | 15.1 °C | 97.03 mm |
| May | 6.7 °C | 19.3 °C | 128.02 mm |
| June | 10.9 °C | 23.1 °C | 101.85 mm |
| July | 12.9 °C | 24.9 °C | 110.49 mm |
| August | 12.3 °C | 24.3 °C | 93.73 mm |
| September | 8.7 °C | 21.4 °C | 91.44 mm |
| October | 2.7 °C | 15.7 °C | 75.95 mm |
| November | -2.6 °C | 9.2 °C | 74.93 mm |
| December | -6.1 °C | 4 °C | 91.95 mm |
| Annual | 2.3 °C | 14.2 °C | 1136.15 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |