Hamilton, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52 °F (low) to 74.2 °F (high). Annual precipitation averages 51.8 Inches. Hamilton 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 | 34.3 °F | 56.2 °F | 4.71 in. |
| February | 37.3 °F | 60.4 °F | 4.9 in. |
| March | 43.0 °F | 67.8 °F | 5.06 in. |
| April | 49.9 °F | 74.6 °F | 4.27 in. |
| May | 58.9 °F | 81.6 °F | 3.45 in. |
| June | 66.3 °F | 87.1 °F | 4.21 in. |
| July | 69.6 °F | 89.7 °F | 5.43 in. |
| August | 69.0 °F | 88.9 °F | 3.82 in. |
| September | 63.5 °F | 84.3 °F | 3.91 in. |
| October | 52.5 °F | 75.7 °F | 3.11 in. |
| November | 42.1 °F | 66.2 °F | 3.79 in. |
| December | 37.0 °F | 58.4 °F | 5.11 in. |
| Annual | 52 °F | 74.2 °F | 51.77 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |