Weirton, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.5 °F (low) to 62.3 °F (high). Annual precipitation averages 41.9 Inches. Weirton is located in USDA Plant Hardiness Zone 7a. 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 | 21.7 °F | 37.4 °F | 3.21 in. |
| February | 23.2 °F | 40.4 °F | 2.49 in. |
| March | 30.0 °F | 49.8 °F | 3.25 in. |
| April | 39.9 °F | 63.4 °F | 3.63 in. |
| May | 50.2 °F | 72.9 °F | 4.04 in. |
| June | 59.0 °F | 80.7 °F | 4.61 in. |
| July | 63.4 °F | 84.1 °F | 4.3 in. |
| August | 62.0 °F | 82.9 °F | 3.53 in. |
| September | 55.4 °F | 76.9 °F | 3.58 in. |
| October | 44.0 °F | 65.0 °F | 3.15 in. |
| November | 34.2 °F | 52.3 °F | 2.96 in. |
| December | 27.2 °F | 41.8 °F | 3.1 in. |
| Annual | 42.5 °F | 62.3 °F | 41.85 in. |
| 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |