Wynnewood, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 23.2 °C (high). Annual precipitation averages 962.4 Millimeters. Wynnewood 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 | -2.1 °C | 11.3 °C | 44.45 mm |
| February | 0 °C | 13.6 °C | 50.55 mm |
| March | 4.7 °C | 18.3 °C | 73.15 mm |
| April | 9.2 °C | 22.9 °C | 91.44 mm |
| May | 14.9 °C | 26.9 °C | 136.65 mm |
| June | 19.9 °C | 31.6 °C | 118.62 mm |
| July | 22.1 °C | 34.6 °C | 73.15 mm |
| August | 21.4 °C | 34.7 °C | 69.34 mm |
| September | 17.1 °C | 30.5 °C | 101.6 mm |
| October | 10.2 °C | 24.3 °C | 88.9 mm |
| November | 4.2 °C | 17.8 °C | 58.67 mm |
| December | -0.9 °C | 12.1 °C | 55.88 mm |
| Annual | 10.1 °C | 23.2 °C | 962.4 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |