Iron City, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.5 °C (low) to 25.9 °C (high). Annual precipitation averages 1428 Millimeters. Iron City is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.9 °C | 16.6 °C | 128.02 mm |
| February | 5.7 °C | 18.7 °C | 124.46 mm |
| March | 8.9 °C | 22.6 °C | 140.97 mm |
| April | 12.7 °C | 26.1 °C | 116.08 mm |
| May | 17.6 °C | 30.2 °C | 81.03 mm |
| June | 21.4 °C | 32.4 °C | 138.18 mm |
| July | 22.3 °C | 33.2 °C | 144.53 mm |
| August | 22.4 °C | 33.1 °C | 142.49 mm |
| September | 19.9 °C | 30.9 °C | 125.73 mm |
| October | 14.1 °C | 27.1 °C | 72.64 mm |
| November | 8 °C | 21.8 °C | 93.98 mm |
| December | 5.3 °C | 17.8 °C | 119.89 mm |
| Annual | 13.5 °C | 25.9 °C | 1428 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |