Forsyth, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51 °F (low) to 74.9 °F (high). Annual precipitation averages 49.7 Inches. Forsyth 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 | 33.3 °F | 56.6 °F | 4.43 in. |
| February | 36.1 °F | 60.4 °F | 4.76 in. |
| March | 41.8 °F | 68.1 °F | 4.9 in. |
| April | 49.0 °F | 75.9 °F | 4.04 in. |
| May | 58.0 °F | 82.9 °F | 2.91 in. |
| June | 65.6 °F | 88.2 °F | 4.17 in. |
| July | 69.3 °F | 91.1 °F | 5.17 in. |
| August | 68.5 °F | 89.7 °F | 4.37 in. |
| September | 62.5 °F | 85.0 °F | 3.63 in. |
| October | 51.4 °F | 76.2 °F | 3.01 in. |
| November | 40.7 °F | 66.5 °F | 3.69 in. |
| December | 35.6 °F | 58.7 °F | 4.63 in. |
| Annual | 51 °F | 74.9 °F | 49.71 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |