Weirton, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 16.8 °C (high). Annual precipitation averages 1063 Millimeters. 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 | -5.7 °C | 3 °C | 81.53 mm |
| February | -4.9 °C | 4.7 °C | 63.25 mm |
| March | -1.1 °C | 9.9 °C | 82.55 mm |
| April | 4.4 °C | 17.4 °C | 92.2 mm |
| May | 10.1 °C | 22.7 °C | 102.62 mm |
| June | 15 °C | 27.1 °C | 117.09 mm |
| July | 17.4 °C | 28.9 °C | 109.22 mm |
| August | 16.7 °C | 28.3 °C | 89.66 mm |
| September | 13 °C | 24.9 °C | 90.93 mm |
| October | 6.7 °C | 18.3 °C | 80.01 mm |
| November | 1.2 °C | 11.3 °C | 75.18 mm |
| December | -2.7 °C | 5.4 °C | 78.74 mm |
| Annual | 5.8 °C | 16.8 °C | 1062.98 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |