Sweetwater, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.5 °F (low) to 72.6 °F (high). Annual precipitation averages 24.2 Inches. Sweetwater is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.1 °F | 50.6 °F | 0.64 in. |
| February | 27.9 °F | 54.2 °F | 0.9 in. |
| March | 36.2 °F | 63.6 °F | 1.59 in. |
| April | 44.5 °F | 72.2 °F | 2.2 in. |
| May | 54.9 °F | 80.6 °F | 3.77 in. |
| June | 64.6 °F | 89.1 °F | 3.43 in. |
| July | 68.6 °F | 94.3 °F | 2.55 in. |
| August | 67.2 °F | 93.5 °F | 2.43 in. |
| September | 59.7 °F | 85.4 °F | 2.36 in. |
| October | 47.3 °F | 74.0 °F | 2.09 in. |
| November | 35.4 °F | 61.8 °F | 1.21 in. |
| December | 26.6 °F | 51.5 °F | 0.99 in. |
| Annual | 46.5 °F | 72.6 °F | 24.16 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |