Marion, Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 18.2 °C (high). Annual precipitation averages 1156.5 Millimeters. Marion is located in USDA Plant Hardiness Zone 7a. 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 | -5.1 °C | 6.2 °C | 97.03 mm |
| February | -3.8 °C | 8.3 °C | 82.8 mm |
| March | -0.4 °C | 13 °C | 99.31 mm |
| April | 4.3 °C | 18.4 °C | 102.87 mm |
| May | 9.2 °C | 22.9 °C | 120.65 mm |
| June | 13.9 °C | 26.6 °C | 116.08 mm |
| July | 16 °C | 28.3 °C | 105.66 mm |
| August | 15.3 °C | 27.9 °C | 105.92 mm |
| September | 11.7 °C | 25.1 °C | 79.76 mm |
| October | 4.6 °C | 19.5 °C | 73.91 mm |
| November | -0.7 °C | 13.6 °C | 74.93 mm |
| December | -3.3 °C | 8.3 °C | 97.54 mm |
| Annual | 5.1 °C | 18.2 °C | 1156.46 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |