Sweetwater, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.6 °F (low) to 76.7 °F (high). Annual precipitation averages 22.9 Inches. 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 | 31.5 °F | 56.8 °F | 0.97 in. |
| February | 34.9 °F | 61.1 °F | 1.24 in. |
| March | 42.2 °F | 69.3 °F | 1.64 in. |
| April | 50.3 °F | 78.0 °F | 1.55 in. |
| May | 60.1 °F | 85.2 °F | 3.05 in. |
| June | 68.1 °F | 91.6 °F | 2.86 in. |
| July | 71.3 °F | 95.0 °F | 1.82 in. |
| August | 70.6 °F | 94.4 °F | 2.24 in. |
| September | 63.5 °F | 86.8 °F | 3.0 in. |
| October | 52.7 °F | 77.8 °F | 2.03 in. |
| November | 41.3 °F | 66.2 °F | 1.35 in. |
| December | 33.0 °F | 58.0 °F | 1.14 in. |
| Annual | 51.6 °F | 76.7 °F | 22.89 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |