New Haven, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 42.5 °F (low) to 65.1 °F (high). Annual precipitation averages 43.6 Inches. New Haven is located in USDA Plant Hardiness Zone 6b. 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 | 21.9 °F | 40.4 °F | 3.2 in. |
| February | 23.9 °F | 44.2 °F | 3.02 in. |
| March | 30.5 °F | 53.6 °F | 3.92 in. |
| April | 41.1 °F | 67.1 °F | 3.69 in. |
| May | 51.3 °F | 75.2 °F | 4.43 in. |
| June | 59.6 °F | 82.7 °F | 4.32 in. |
| July | 63.1 °F | 85.6 °F | 4.58 in. |
| August | 61.8 °F | 85.0 °F | 3.49 in. |
| September | 54.5 °F | 79.3 °F | 3.5 in. |
| October | 42.4 °F | 67.7 °F | 3.04 in. |
| November | 32.9 °F | 55.5 °F | 2.89 in. |
| December | 27.1 °F | 44.7 °F | 3.49 in. |
| Annual | 42.5 °F | 65.1 °F | 43.57 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |