Willow, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 23.1 °C (high). Annual precipitation averages 706.4 Millimeters. Willow is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.4 °C | 10.8 °C | 22.61 mm |
| February | -1.7 °C | 12.8 °C | 26.92 mm |
| March | 2.9 °C | 18 °C | 47.24 mm |
| April | 7.5 °C | 22.8 °C | 69.34 mm |
| May | 13.6 °C | 27.7 °C | 107.7 mm |
| June | 19 °C | 32.6 °C | 90.68 mm |
| July | 21.2 °C | 35.3 °C | 58.42 mm |
| August | 20.5 °C | 34.8 °C | 85.09 mm |
| September | 16.2 °C | 30.4 °C | 67.31 mm |
| October | 9.2 °C | 23.9 °C | 62.99 mm |
| November | 2.6 °C | 16.9 °C | 38.86 mm |
| December | -2.4 °C | 11.1 °C | 29.21 mm |
| Annual | 8.8 °C | 23.1 °C | 706.37 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |