Flemington, 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 17.6 °C (high). Annual precipitation averages 1227.1 Millimeters. Flemington 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.8 °C | 4.5 °C | 94.23 mm |
| February | -4.9 °C | 6.2 °C | 86.36 mm |
| March | -1.2 °C | 11.6 °C | 103.12 mm |
| April | 4.3 °C | 18.7 °C | 102.87 mm |
| May | 9.7 °C | 23.1 °C | 120.9 mm |
| June | 14.5 °C | 27.1 °C | 118.87 mm |
| July | 16.8 °C | 28.8 °C | 140.46 mm |
| August | 16 °C | 28.3 °C | 102.36 mm |
| September | 12.1 °C | 25.3 °C | 93.47 mm |
| October | 5.4 °C | 18.8 °C | 85.85 mm |
| November | 0.1 °C | 12.3 °C | 80.26 mm |
| December | -3.2 °C | 6.7 °C | 98.3 mm |
| Annual | 5.3 °C | 17.6 °C | 1227.05 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |