Nitro, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 43.4 °F (low) to 66.3 °F (high). Annual precipitation averages 44.6 Inches. Nitro 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 | 23.4 °F | 42.7 °F | 3.37 in. |
| February | 25.4 °F | 46.5 °F | 2.97 in. |
| March | 31.6 °F | 55.8 °F | 4.07 in. |
| April | 41.2 °F | 68.3 °F | 3.6 in. |
| May | 51.6 °F | 76.0 °F | 4.65 in. |
| June | 60.0 °F | 82.9 °F | 4.27 in. |
| July | 64.3 °F | 86.4 °F | 5.17 in. |
| August | 62.9 °F | 85.3 °F | 3.61 in. |
| September | 55.8 °F | 79.8 °F | 3.34 in. |
| October | 43.6 °F | 68.5 °F | 2.99 in. |
| November | 33.1 °F | 56.6 °F | 2.89 in. |
| December | 27.5 °F | 46.5 °F | 3.64 in. |
| Annual | 43.4 °F | 66.3 °F | 44.57 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |