Fairburn, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.7 °F (low) to 71.9 °F (high). Annual precipitation averages 53.3 Inches. Fairburn is located in USDA Plant Hardiness Zone 8b. 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 | 32.8 °F | 53.0 °F | 4.87 in. |
| February | 35.8 °F | 57.0 °F | 4.88 in. |
| March | 42.4 °F | 64.8 °F | 5.19 in. |
| April | 50.2 °F | 72.6 °F | 4.26 in. |
| May | 59.3 °F | 79.6 °F | 3.77 in. |
| June | 66.9 °F | 85.5 °F | 4.29 in. |
| July | 70.1 °F | 88.5 °F | 5.16 in. |
| August | 69.4 °F | 87.6 °F | 4.41 in. |
| September | 63.7 °F | 82.6 °F | 3.94 in. |
| October | 52.3 °F | 73.2 °F | 3.49 in. |
| November | 41.4 °F | 63.4 °F | 4.16 in. |
| December | 35.8 °F | 55.5 °F | 4.9 in. |
| Annual | 51.7 °F | 71.9 °F | 53.32 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |