Lilburn, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.8 °F (low) to 71.9 °F (high). Annual precipitation averages 54.7 Inches. Lilburn is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.0 °F | 52.3 °F | 4.92 in. |
| February | 35.0 °F | 56.4 °F | 4.98 in. |
| March | 41.3 °F | 64.4 °F | 5.27 in. |
| April | 49.0 °F | 72.6 °F | 4.3 in. |
| May | 58.1 °F | 79.9 °F | 3.96 in. |
| June | 66.2 °F | 86.1 °F | 4.56 in. |
| July | 69.5 °F | 88.8 °F | 5.32 in. |
| August | 68.8 °F | 88.1 °F | 4.43 in. |
| September | 62.8 °F | 82.9 °F | 4.21 in. |
| October | 51.2 °F | 73.5 °F | 3.7 in. |
| November | 40.4 °F | 63.2 °F | 4.3 in. |
| December | 35.1 °F | 55.0 °F | 4.71 in. |
| Annual | 50.8 °F | 71.9 °F | 54.66 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |