Willow, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.8 °F (low) to 73.6 °F (high). Annual precipitation averages 27.8 Inches. 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 | 25.8 °F | 51.4 °F | 0.89 in. |
| February | 28.9 °F | 55.1 °F | 1.06 in. |
| March | 37.3 °F | 64.4 °F | 1.86 in. |
| April | 45.5 °F | 73.0 °F | 2.73 in. |
| May | 56.5 °F | 81.8 °F | 4.24 in. |
| June | 66.2 °F | 90.6 °F | 3.57 in. |
| July | 70.1 °F | 95.5 °F | 2.3 in. |
| August | 68.9 °F | 94.7 °F | 3.35 in. |
| September | 61.2 °F | 86.7 °F | 2.65 in. |
| October | 48.6 °F | 75.1 °F | 2.48 in. |
| November | 36.6 °F | 62.5 °F | 1.53 in. |
| December | 27.6 °F | 51.9 °F | 1.15 in. |
| Annual | 47.8 °F | 73.6 °F | 27.81 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |