Willow Oak, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17 °C (low) to 28.5 °C (high). Annual precipitation averages 1410.7 Millimeters. Willow Oak is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.4 °C | 22.1 °C | 74.17 mm |
| February | 11.1 °C | 23.8 °C | 59.44 mm |
| March | 12.9 °C | 26.1 °C | 73.41 mm |
| April | 15.9 °C | 28.8 °C | 74.93 mm |
| May | 19.2 °C | 31.4 °C | 93.98 mm |
| June | 22.1 °C | 32.7 °C | 222.25 mm |
| July | 23.1 °C | 33.1 °C | 219.2 mm |
| August | 23.1 °C | 33.2 °C | 212.09 mm |
| September | 22.3 °C | 32.3 °C | 190.25 mm |
| October | 18.9 °C | 29.6 °C | 72.9 mm |
| November | 14.1 °C | 25.9 °C | 46.48 mm |
| December | 11.3 °C | 23.4 °C | 71.63 mm |
| Annual | 17 °C | 28.5 °C | 1410.73 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |