Mountain City, Georgia has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 7.2 °C (low) to 19.9 °C (high). Annual precipitation averages 1771.6 Millimeters. Mountain City 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.4 °C | 9.6 °C | 150.11 mm |
| February | -1.2 °C | 11.7 °C | 156.46 mm |
| March | 2.2 °C | 15.6 °C | 151.89 mm |
| April | 6.3 °C | 20.3 °C | 146.05 mm |
| May | 11 °C | 23.9 °C | 131.83 mm |
| June | 15.2 °C | 27.2 °C | 152.15 mm |
| July | 17.1 °C | 28.8 °C | 149.1 mm |
| August | 16.7 °C | 28.3 °C | 152.65 mm |
| September | 13.4 °C | 25.6 °C | 142.49 mm |
| October | 7.2 °C | 20.8 °C | 129.79 mm |
| November | 1.7 °C | 15.6 °C | 135.64 mm |
| December | -0.9 °C | 11.2 °C | 173.48 mm |
| Annual | 7.2 °C | 19.9 °C | 1771.64 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 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 | Cfb - Temperate Oceanic Climate |