Sistersville, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 64 °F (high). Annual precipitation averages 46.5 Inches. Sistersville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.9 °F | 39.3 °F | 3.55 in. |
| February | 22.5 °F | 42.7 °F | 3.12 in. |
| March | 29.3 °F | 52.3 °F | 4.03 in. |
| April | 39.0 °F | 66.1 °F | 3.95 in. |
| May | 49.3 °F | 74.4 °F | 4.76 in. |
| June | 58.6 °F | 81.8 °F | 4.67 in. |
| July | 63.0 °F | 85.0 °F | 4.87 in. |
| August | 61.7 °F | 84.2 °F | 3.9 in. |
| September | 54.4 °F | 78.3 °F | 3.67 in. |
| October | 42.0 °F | 66.7 °F | 3.15 in. |
| November | 31.7 °F | 54.1 °F | 3.22 in. |
| December | 25.8 °F | 43.5 °F | 3.57 in. |
| Annual | 41.5 °F | 64 °F | 46.46 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |