Rockwood, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 20.7 °C (high). Annual precipitation averages 1561.6 Millimeters. Rockwood 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 | -2.3 °C | 8.6 °C | 136.14 mm |
| February | -0.8 °C | 11.1 °C | 143 mm |
| March | 2.7 °C | 16 °C | 144.02 mm |
| April | 7.2 °C | 21.3 °C | 140.21 mm |
| May | 12.7 °C | 25.6 °C | 122.43 mm |
| June | 17.2 °C | 29.2 °C | 125.98 mm |
| July | 19.4 °C | 30.8 °C | 165.35 mm |
| August | 18.6 °C | 30.6 °C | 99.31 mm |
| September | 15.2 °C | 27.8 °C | 113.54 mm |
| October | 8.3 °C | 21.8 °C | 86.36 mm |
| November | 2.3 °C | 15.4 °C | 115.57 mm |
| December | -0.5 °C | 10.3 °C | 169.67 mm |
| Annual | 8.3 °C | 20.7 °C | 1561.58 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |