Wynona, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.7 °F (low) to 71.1 °F (high). Annual precipitation averages 40.5 Inches. Wynona is located in USDA Plant Hardiness Zone 7a. 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 | 24.8 °F | 48.3 °F | 1.43 in. |
| February | 28.3 °F | 52.8 °F | 1.78 in. |
| March | 37.4 °F | 62.3 °F | 3.04 in. |
| April | 46.9 °F | 71.5 °F | 4.53 in. |
| May | 57.0 °F | 78.3 °F | 5.82 in. |
| June | 66.1 °F | 86.5 °F | 5.26 in. |
| July | 70.2 °F | 91.9 °F | 4.08 in. |
| August | 68.5 °F | 92.0 °F | 3.58 in. |
| September | 60.4 °F | 84.5 °F | 3.51 in. |
| October | 48.1 °F | 73.3 °F | 3.4 in. |
| November | 37.2 °F | 61.6 °F | 2.29 in. |
| December | 27.8 °F | 50.0 °F | 1.76 in. |
| Annual | 47.7 °F | 71.1 °F | 40.48 in. |
| 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |