Warrenton, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 43.9 °F (low) to 66.1 °F (high). Annual precipitation averages 44.9 Inches. Warrenton 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 | 23.6 °F | 44.0 °F | 3.05 in. |
| February | 25.6 °F | 46.7 °F | 2.6 in. |
| March | 32.1 °F | 55.0 °F | 3.8 in. |
| April | 42.0 °F | 66.4 °F | 3.55 in. |
| May | 51.6 °F | 74.4 °F | 4.55 in. |
| June | 60.4 °F | 82.5 °F | 4.65 in. |
| July | 65.1 °F | 86.7 °F | 4.34 in. |
| August | 63.2 °F | 85.1 °F | 3.47 in. |
| September | 56.3 °F | 79.1 °F | 4.46 in. |
| October | 44.5 °F | 67.9 °F | 3.68 in. |
| November | 34.5 °F | 57.2 °F | 3.2 in. |
| December | 27.5 °F | 47.6 °F | 3.58 in. |
| Annual | 43.9 °F | 66.1 °F | 44.93 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |