Darien, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.9 °C (low) to 25.6 °C (high). Annual precipitation averages 1286 Millimeters. Darien is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.3 °C | 17.3 °C | 90.42 mm |
| February | 5.7 °C | 18.9 °C | 78.74 mm |
| March | 8.9 °C | 22.2 °C | 85.09 mm |
| April | 13 °C | 25.6 °C | 80.77 mm |
| May | 17.4 °C | 29.2 °C | 76.71 mm |
| June | 21.3 °C | 31.7 °C | 164.08 mm |
| July | 22.8 °C | 33.3 °C | 153.67 mm |
| August | 22.7 °C | 32.6 °C | 169.67 mm |
| September | 20.4 °C | 30 °C | 144.02 mm |
| October | 15.2 °C | 26.3 °C | 116.59 mm |
| November | 9.4 °C | 22.1 °C | 49.28 mm |
| December | 6.2 °C | 18.4 °C | 76.96 mm |
| Annual | 13.9 °C | 25.6 °C | 1286 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |