Sweetwater, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.6 °C (low) to 21 °C (high). Annual precipitation averages 1525.8 Millimeters. Sweetwater 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 | -1.9 °C | 8.9 °C | 137.41 mm |
| February | -0.5 °C | 11.3 °C | 130.05 mm |
| March | 3.1 °C | 16.3 °C | 145.8 mm |
| April | 7.7 °C | 21.4 °C | 133.6 mm |
| May | 13 °C | 26 °C | 116.84 mm |
| June | 17.6 °C | 29.4 °C | 129.79 mm |
| July | 19.7 °C | 31.1 °C | 148.59 mm |
| August | 19 °C | 30.9 °C | 103.63 mm |
| September | 15.4 °C | 28.3 °C | 118.62 mm |
| October | 8.3 °C | 22.2 °C | 89.66 mm |
| November | 2.2 °C | 15.8 °C | 121.16 mm |
| December | -0.2 °C | 10.7 °C | 150.62 mm |
| Annual | 8.6 °C | 21 °C | 1525.77 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |