Sistersville, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 17.8 °C (high). Annual precipitation averages 1180.1 Millimeters. 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 | -6.2 °C | 4.1 °C | 90.17 mm |
| February | -5.3 °C | 5.9 °C | 79.25 mm |
| March | -1.5 °C | 11.3 °C | 102.36 mm |
| April | 3.9 °C | 18.9 °C | 100.33 mm |
| May | 9.6 °C | 23.6 °C | 120.9 mm |
| June | 14.8 °C | 27.7 °C | 118.62 mm |
| July | 17.2 °C | 29.4 °C | 123.7 mm |
| August | 16.5 °C | 29 °C | 99.06 mm |
| September | 12.4 °C | 25.7 °C | 93.22 mm |
| October | 5.6 °C | 19.3 °C | 80.01 mm |
| November | -0.2 °C | 12.3 °C | 81.79 mm |
| December | -3.4 °C | 6.4 °C | 90.68 mm |
| Annual | 5.3 °C | 17.8 °C | 1180.09 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |