Willow Oak, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 62.5 °F (low) to 83.4 °F (high). Annual precipitation averages 55.5 Inches. Willow Oak is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 49.0 °F | 71.8 °F | 2.92 in. |
| February | 51.9 °F | 74.8 °F | 2.34 in. |
| March | 55.3 °F | 78.9 °F | 2.89 in. |
| April | 60.7 °F | 83.9 °F | 2.95 in. |
| May | 66.5 °F | 88.5 °F | 3.7 in. |
| June | 71.7 °F | 90.8 °F | 8.75 in. |
| July | 73.5 °F | 91.6 °F | 8.63 in. |
| August | 73.6 °F | 91.7 °F | 8.35 in. |
| September | 72.2 °F | 90.2 °F | 7.49 in. |
| October | 66.0 °F | 85.2 °F | 2.87 in. |
| November | 57.4 °F | 78.7 °F | 1.83 in. |
| December | 52.3 °F | 74.1 °F | 2.82 in. |
| Annual | 62.5 °F | 83.4 °F | 55.54 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |