Sweetwater, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.9 °C (low) to 24.8 °C (high). Annual precipitation averages 581.4 Millimeters. Sweetwater is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.3 °C | 13.8 °C | 24.64 mm |
| February | 1.6 °C | 16.2 °C | 31.5 mm |
| March | 5.7 °C | 20.7 °C | 41.66 mm |
| April | 10.2 °C | 25.6 °C | 39.37 mm |
| May | 15.6 °C | 29.6 °C | 77.47 mm |
| June | 20.1 °C | 33.1 °C | 72.64 mm |
| July | 21.8 °C | 35 °C | 46.23 mm |
| August | 21.4 °C | 34.7 °C | 56.9 mm |
| September | 17.5 °C | 30.4 °C | 76.2 mm |
| October | 11.5 °C | 25.4 °C | 51.56 mm |
| November | 5.2 °C | 19 °C | 34.29 mm |
| December | 0.6 °C | 14.4 °C | 28.96 mm |
| Annual | 10.9 °C | 24.8 °C | 581.42 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |