Barnesville, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.7 °F (low) to 73.9 °F (high). Annual precipitation averages 50.2 Inches. Barnesville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.9 °F | 55.6 °F | 4.57 in. |
| February | 36.7 °F | 59.3 °F | 4.51 in. |
| March | 42.8 °F | 67.1 °F | 5.04 in. |
| April | 49.9 °F | 74.4 °F | 4.03 in. |
| May | 58.9 °F | 81.8 °F | 3.14 in. |
| June | 66.3 °F | 87.2 °F | 4.31 in. |
| July | 69.6 °F | 90.0 °F | 5.02 in. |
| August | 69.0 °F | 88.9 °F | 4.2 in. |
| September | 63.2 °F | 84.2 °F | 3.71 in. |
| October | 52.2 °F | 75.2 °F | 3.14 in. |
| November | 41.7 °F | 65.6 °F | 3.78 in. |
| December | 36.4 °F | 57.7 °F | 4.78 in. |
| Annual | 51.7 °F | 73.9 °F | 50.23 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |