Ashburn, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.6 °F (low) to 76.5 °F (high). Annual precipitation averages 49.4 Inches. Ashburn is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.7 °F | 59.2 °F | 4.55 in. |
| February | 41.4 °F | 63.0 °F | 4.37 in. |
| March | 46.8 °F | 70.1 °F | 4.86 in. |
| April | 54.6 °F | 77.0 °F | 3.42 in. |
| May | 63.0 °F | 84.4 °F | 3.15 in. |
| June | 69.5 °F | 88.7 °F | 5.15 in. |
| July | 71.9 °F | 90.9 °F | 4.7 in. |
| August | 71.2 °F | 89.9 °F | 4.53 in. |
| September | 66.4 °F | 86.2 °F | 4.22 in. |
| October | 56.3 °F | 78.2 °F | 3.25 in. |
| November | 46.2 °F | 68.8 °F | 3.14 in. |
| December | 41.2 °F | 61.5 °F | 4.01 in. |
| Annual | 55.6 °F | 76.5 °F | 49.35 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |