Kathleen, 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 1388.9 Millimeters. Kathleen is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.6 °C | 22.2 °C | 76.2 mm |
| February | 11.1 °C | 23.9 °C | 59.94 mm |
| March | 13 °C | 26.2 °C | 72.64 mm |
| April | 16.1 °C | 28.8 °C | 73.41 mm |
| May | 19.3 °C | 31.4 °C | 88.9 mm |
| June | 22.2 °C | 32.7 °C | 222.25 mm |
| July | 23.2 °C | 33.1 °C | 214.88 mm |
| August | 23.2 °C | 33.1 °C | 212.6 mm |
| September | 22.4 °C | 32.2 °C | 181.1 mm |
| October | 19 °C | 29.5 °C | 71.88 mm |
| November | 14.1 °C | 25.9 °C | 48.01 mm |
| December | 11.2 °C | 23.3 °C | 67.06 mm |
| Annual | 17 °C | 28.5 °C | 1388.87 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |