Hiawassee, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.8 °C (low) to 20 °C (high). Annual precipitation averages 1485.6 Millimeters. Hiawassee is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.2 °C | 9 °C | 135.64 mm |
| February | -1.6 °C | 11.4 °C | 121.41 mm |
| March | 1.7 °C | 15.4 °C | 147.57 mm |
| April | 5.8 °C | 20.6 °C | 121.67 mm |
| May | 10.7 °C | 24.3 °C | 116.84 mm |
| June | 15 °C | 27.4 °C | 123.44 mm |
| July | 16.9 °C | 29.1 °C | 142.49 mm |
| August | 16.4 °C | 28.6 °C | 106.93 mm |
| September | 12.9 °C | 26.1 °C | 112.27 mm |
| October | 6.6 °C | 21.1 °C | 94.74 mm |
| November | 1.2 °C | 15.7 °C | 115.06 mm |
| December | -1.4 °C | 10.9 °C | 147.57 mm |
| Annual | 6.8 °C | 20 °C | 1485.63 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |