Spelter, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.3 °F (low) to 63.8 °F (high). Annual precipitation averages 48 Inches. Spelter 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.3 °F | 39.9 °F | 3.66 in. |
| February | 22.8 °F | 43.2 °F | 3.43 in. |
| March | 29.4 °F | 52.7 °F | 4.17 in. |
| April | 39.2 °F | 65.7 °F | 3.98 in. |
| May | 49.1 °F | 73.9 °F | 4.74 in. |
| June | 57.9 °F | 81.2 °F | 4.67 in. |
| July | 62.1 °F | 84.3 °F | 5.3 in. |
| August | 60.8 °F | 83.2 °F | 4.04 in. |
| September | 53.6 °F | 77.5 °F | 3.55 in. |
| October | 41.4 °F | 65.8 °F | 3.34 in. |
| November | 31.8 °F | 54.1 °F | 3.28 in. |
| December | 25.9 °F | 44.0 °F | 3.83 in. |
| Annual | 41.3 °F | 63.8 °F | 47.99 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |