Wellersburg, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.5 °F (low) to 61.4 °F (high). Annual precipitation averages 42.2 Inches. Wellersburg is located in USDA Plant Hardiness Zone 6b. 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 | 21.0 °F | 36.8 °F | 2.93 in. |
| February | 22.0 °F | 40.3 °F | 2.72 in. |
| March | 28.6 °F | 49.0 °F | 3.71 in. |
| April | 38.4 °F | 62.8 °F | 3.74 in. |
| May | 48.1 °F | 71.7 °F | 4.63 in. |
| June | 56.5 °F | 79.3 °F | 4.34 in. |
| July | 60.6 °F | 83.4 °F | 3.6 in. |
| August | 58.9 °F | 82.0 °F | 3.43 in. |
| September | 52.2 °F | 75.4 °F | 3.79 in. |
| October | 41.5 °F | 63.7 °F | 3.13 in. |
| November | 32.2 °F | 51.3 °F | 2.92 in. |
| December | 25.4 °F | 40.9 °F | 3.25 in. |
| Annual | 40.5 °F | 61.4 °F | 42.19 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |