Washington, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 19 °C (high). Annual precipitation averages 1134.4 Millimeters. Washington is located in USDA Plant Hardiness Zone 7a. 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 | -4.8 °C | 6.7 °C | 72.14 mm |
| February | -3.7 °C | 8.4 °C | 58.67 mm |
| March | 0 °C | 13 °C | 84.58 mm |
| April | 5.4 °C | 19.3 °C | 93.98 mm |
| May | 10.6 °C | 23.6 °C | 119.13 mm |
| June | 15.4 °C | 28.2 °C | 121.41 mm |
| July | 17.8 °C | 30.4 °C | 113.28 mm |
| August | 16.9 °C | 29.4 °C | 96.01 mm |
| September | 13 °C | 26.2 °C | 123.7 mm |
| October | 6.6 °C | 20.3 °C | 89.66 mm |
| November | 0.9 °C | 14.1 °C | 81.53 mm |
| December | -2.8 °C | 8.8 °C | 80.26 mm |
| Annual | 6.3 °C | 19 °C | 1134.35 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |