Arlington, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 19.4 °C (high). Annual precipitation averages 1156.5 Millimeters. Arlington is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.4 °C | 6.6 °C | 79.25 mm |
| February | -1.6 °C | 8.4 °C | 69.6 mm |
| March | 2.1 °C | 13 °C | 99.82 mm |
| April | 7.7 °C | 19.6 °C | 88.14 mm |
| May | 13.1 °C | 24.3 °C | 114.05 mm |
| June | 18.2 °C | 28.9 °C | 114.3 mm |
| July | 20.8 °C | 31.4 °C | 117.35 mm |
| August | 19.9 °C | 30.4 °C | 92.46 mm |
| September | 16.2 °C | 26.7 °C | 109.73 mm |
| October | 9.6 °C | 20.3 °C | 99.31 mm |
| November | 3.8 °C | 14.2 °C | 79.5 mm |
| December | -0.1 °C | 8.8 °C | 92.96 mm |
| Annual | 8.9 °C | 19.4 °C | 1156.47 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |