Stonewall, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.9 °F (low) to 73.4 °F (high). Annual precipitation averages 42 Inches. Stonewall is located in USDA Plant Hardiness Zone 7b. 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 | 28.2 °F | 52.0 °F | 2.04 in. |
| February | 32.1 °F | 56.0 °F | 2.3 in. |
| March | 40.3 °F | 64.3 °F | 3.39 in. |
| April | 48.5 °F | 73.0 °F | 4.11 in. |
| May | 58.7 °F | 79.7 °F | 5.64 in. |
| June | 67.4 °F | 88.0 °F | 4.65 in. |
| July | 70.9 °F | 93.4 °F | 3.47 in. |
| August | 69.6 °F | 94.0 °F | 2.82 in. |
| September | 62.1 °F | 86.8 °F | 3.97 in. |
| October | 50.4 °F | 75.4 °F | 4.07 in. |
| November | 39.6 °F | 64.3 °F | 2.82 in. |
| December | 30.7 °F | 53.7 °F | 2.67 in. |
| Annual | 49.9 °F | 73.4 °F | 41.95 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |