Fair Oaks, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.2 °C (low) to 18.6 °C (high). Annual precipitation averages 1115.3 Millimeters. Fair Oaks 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 | -4.1 °C | 5.9 °C | 74.17 mm |
| February | -3.3 °C | 7.7 °C | 66.55 mm |
| March | 0.4 °C | 12.4 °C | 93.47 mm |
| April | 6 °C | 18.8 °C | 82.55 mm |
| May | 11.4 °C | 23.3 °C | 111.51 mm |
| June | 16.4 °C | 27.9 °C | 113.28 mm |
| July | 19.2 °C | 30.4 °C | 114.05 mm |
| August | 18.2 °C | 29.4 °C | 88.39 mm |
| September | 14.4 °C | 25.8 °C | 106.93 mm |
| October | 7.6 °C | 19.4 °C | 93.47 mm |
| November | 1.9 °C | 13.6 °C | 78.99 mm |
| December | -1.8 °C | 8.1 °C | 91.95 mm |
| Annual | 7.2 °C | 18.6 °C | 1115.31 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 |