Franklin, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40 °F (low) to 64 °F (high). Annual precipitation averages 37.5 Inches. Franklin 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 | 21.0 °F | 41.4 °F | 2.4 in. |
| February | 22.6 °F | 44.5 °F | 1.87 in. |
| March | 28.9 °F | 52.3 °F | 3.11 in. |
| April | 38.0 °F | 64.7 °F | 3.26 in. |
| May | 47.5 °F | 73.0 °F | 4.24 in. |
| June | 56.0 °F | 80.5 °F | 3.4 in. |
| July | 59.8 °F | 84.1 °F | 4.25 in. |
| August | 58.4 °F | 83.0 °F | 3.81 in. |
| September | 51.8 °F | 77.5 °F | 3.62 in. |
| October | 40.4 °F | 66.8 °F | 2.4 in. |
| November | 30.7 °F | 54.9 °F | 2.54 in. |
| December | 24.9 °F | 45.4 °F | 2.59 in. |
| Annual | 40 °F | 64 °F | 37.49 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |