Iron City, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.1 °F (low) to 71.6 °F (high). Annual precipitation averages 62.3 Inches. Iron City is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.8 °F | 50.1 °F | 5.28 in. |
| February | 32.9 °F | 54.7 °F | 5.73 in. |
| March | 39.8 °F | 63.2 °F | 6.23 in. |
| April | 48.1 °F | 72.6 °F | 5.73 in. |
| May | 57.1 °F | 79.7 °F | 5.11 in. |
| June | 65.1 °F | 86.6 °F | 4.48 in. |
| July | 68.7 °F | 89.5 °F | 5.19 in. |
| August | 67.4 °F | 89.0 °F | 4.79 in. |
| September | 61.0 °F | 84.3 °F | 4.49 in. |
| October | 48.7 °F | 74.1 °F | 4.81 in. |
| November | 37.9 °F | 62.1 °F | 4.26 in. |
| December | 32.7 °F | 52.8 °F | 6.18 in. |
| Annual | 49.1 °F | 71.6 °F | 62.28 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |