Darien, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.1 °F (low) to 78.2 °F (high). Annual precipitation averages 50.6 Inches. Darien is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.8 °F | 63.1 °F | 3.56 in. |
| February | 42.3 °F | 66.1 °F | 3.1 in. |
| March | 48.0 °F | 72.0 °F | 3.35 in. |
| April | 55.4 °F | 78.0 °F | 3.18 in. |
| May | 63.3 °F | 84.6 °F | 3.02 in. |
| June | 70.4 °F | 89.0 °F | 6.46 in. |
| July | 73.1 °F | 92.0 °F | 6.05 in. |
| August | 72.8 °F | 90.6 °F | 6.68 in. |
| September | 68.8 °F | 86.0 °F | 5.67 in. |
| October | 59.3 °F | 79.4 °F | 4.59 in. |
| November | 49.0 °F | 71.8 °F | 1.94 in. |
| December | 43.1 °F | 65.2 °F | 3.03 in. |
| Annual | 57.1 °F | 78.2 °F | 50.63 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |