Helen, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.1 °C (low) to 20.6 °C (high). Annual precipitation averages 1773.4 Millimeters. Helen is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.6 °C | 10.1 °C | 162.05 mm |
| February | -0.1 °C | 12.3 °C | 144.53 mm |
| March | 2.9 °C | 16.3 °C | 167.13 mm |
| April | 6.9 °C | 21.3 °C | 140.46 mm |
| May | 11.8 °C | 24.8 °C | 123.95 mm |
| June | 16.2 °C | 28.1 °C | 144.78 mm |
| July | 18.1 °C | 29.6 °C | 146.81 mm |
| August | 17.8 °C | 29.1 °C | 171.2 mm |
| September | 14.7 °C | 26.3 °C | 131.06 mm |
| October | 8.1 °C | 21.2 °C | 129.03 mm |
| November | 2.4 °C | 15.9 °C | 144.27 mm |
| December | -0.1 °C | 11.6 °C | 168.15 mm |
| Annual | 8.1 °C | 20.6 °C | 1773.42 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |