Richlands, Virginia has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 5.4 °C (low) to 18.2 °C (high). Annual precipitation averages 1119.9 Millimeters. Richlands 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 | -4.9 °C | 6.4 °C | 82.8 mm |
| February | -3.7 °C | 8.3 °C | 80.01 mm |
| March | -0.4 °C | 12.9 °C | 102.36 mm |
| April | 4.4 °C | 18.7 °C | 100.08 mm |
| May | 9.6 °C | 23.2 °C | 106.43 mm |
| June | 14.3 °C | 26.7 °C | 108.71 mm |
| July | 16.4 °C | 28.2 °C | 124.97 mm |
| August | 15.7 °C | 27.9 °C | 97.79 mm |
| September | 12 °C | 25.3 °C | 86.87 mm |
| October | 5.2 °C | 19.4 °C | 67.56 mm |
| November | -0.2 °C | 13.6 °C | 69.85 mm |
| December | -3.2 °C | 8.3 °C | 92.46 mm |
| Annual | 5.4 °C | 18.2 °C | 1119.89 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 | Abnormally Dry |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |