Ferrum, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.1 °C (low) to 19.6 °C (high). Annual precipitation averages 1245.6 Millimeters. Ferrum is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.4 °C | 7.9 °C | 100.58 mm |
| February | -2.3 °C | 9.9 °C | 78.99 mm |
| March | 1.1 °C | 14.4 °C | 101.6 mm |
| April | 6.1 °C | 20.2 °C | 103.63 mm |
| May | 11.3 °C | 24.2 °C | 118.62 mm |
| June | 15.8 °C | 28.1 °C | 117.86 mm |
| July | 18.3 °C | 30 °C | 114.55 mm |
| August | 17.6 °C | 29.1 °C | 104.39 mm |
| September | 13.9 °C | 25.8 °C | 131.06 mm |
| October | 7.2 °C | 20.7 °C | 88.9 mm |
| November | 1.4 °C | 14.9 °C | 86.61 mm |
| December | -1.7 °C | 9.7 °C | 98.81 mm |
| Annual | 7.1 °C | 19.6 °C | 1245.6 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |