Hillsboro, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38 °F (low) to 61.4 °F (high). Annual precipitation averages 44.9 Inches. Hillsboro is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.6 °F | 38.4 °F | 3.43 in. |
| February | 20.4 °F | 42.4 °F | 3.05 in. |
| March | 26.7 °F | 50.8 °F | 4.17 in. |
| April | 35.6 °F | 62.8 °F | 4.02 in. |
| May | 45.5 °F | 71.3 °F | 4.76 in. |
| June | 53.9 °F | 77.7 °F | 4.04 in. |
| July | 58.2 °F | 81.1 °F | 4.19 in. |
| August | 57.3 °F | 79.8 °F | 3.72 in. |
| September | 50.7 °F | 74.4 °F | 3.54 in. |
| October | 38.4 °F | 63.7 °F | 2.96 in. |
| November | 27.9 °F | 52.0 °F | 3.09 in. |
| December | 22.2 °F | 41.9 °F | 3.96 in. |
| Annual | 38 °F | 61.4 °F | 44.93 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |