Washington, District of Columbia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 19.6 °C (high). Annual precipitation averages 1148.1 Millimeters. Washington is located in USDA Plant Hardiness Zone 8a. 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 | -1.9 °C | 6.8 °C | 78.74 mm |
| February | -1.1 °C | 8.7 °C | 68.33 mm |
| March | 2.7 °C | 13.2 °C | 99.31 mm |
| April | 8.2 °C | 19.7 °C | 87.63 mm |
| May | 13.6 °C | 24.3 °C | 113.03 mm |
| June | 18.7 °C | 29.2 °C | 115.06 mm |
| July | 21.4 °C | 31.7 °C | 116.33 mm |
| August | 20.4 °C | 30.7 °C | 92.2 mm |
| September | 16.7 °C | 26.9 °C | 107.95 mm |
| October | 10.1 °C | 20.7 °C | 97.54 mm |
| November | 4.3 °C | 14.4 °C | 78.23 mm |
| December | 0.5 °C | 9.1 °C | 93.73 mm |
| Annual | 9.5 °C | 19.6 °C | 1148.08 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 8a : -12.2°C to -9.4°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 |