Friendly, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 17.8 °C (high). Annual precipitation averages 1185.9 Millimeters. Friendly 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 | -6.2 °C | 4.1 °C | 88.9 mm |
| February | -5.4 °C | 6 °C | 79.25 mm |
| March | -1.6 °C | 11.3 °C | 102.11 mm |
| April | 3.9 °C | 18.8 °C | 101.6 mm |
| May | 9.6 °C | 23.4 °C | 123.19 mm |
| June | 14.7 °C | 27.6 °C | 119.38 mm |
| July | 17.1 °C | 29.4 °C | 125.98 mm |
| August | 16.3 °C | 28.9 °C | 100.84 mm |
| September | 12.2 °C | 25.7 °C | 91.19 mm |
| October | 5.3 °C | 19.1 °C | 80.01 mm |
| November | -0.2 °C | 12.3 °C | 83.31 mm |
| December | -3.6 °C | 6.4 °C | 90.17 mm |
| Annual | 5.2 °C | 17.8 °C | 1185.93 mm |
| 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 : -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 |