Fairfax Station, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 18.8 °C (high). Annual precipitation averages 1114.8 Millimeters. Fairfax Station is located in USDA Plant Hardiness Zone 7b. 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 | -3.9 °C | 6.1 °C | 73.41 mm |
| February | -3.1 °C | 7.9 °C | 66.29 mm |
| March | 0.7 °C | 12.6 °C | 92.71 mm |
| April | 6.3 °C | 19.1 °C | 82.04 mm |
| May | 11.7 °C | 23.6 °C | 110.49 mm |
| June | 16.8 °C | 28.3 °C | 113.28 mm |
| July | 19.5 °C | 30.7 °C | 115.57 mm |
| August | 18.4 °C | 29.7 °C | 88.39 mm |
| September | 14.8 °C | 26.1 °C | 107.44 mm |
| October | 8 °C | 19.7 °C | 93.47 mm |
| November | 2.1 °C | 13.7 °C | 78.74 mm |
| December | -1.7 °C | 8.2 °C | 92.96 mm |
| Annual | 7.5 °C | 18.8 °C | 1114.79 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |