Lake Kathryn, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.3 °C (low) to 28.1 °C (high). Annual precipitation averages 1418.6 Millimeters. Lake Kathryn is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.2 °C | 21.2 °C | 77.47 mm |
| February | 8.7 °C | 22.8 °C | 61.21 mm |
| March | 10.8 °C | 25.4 °C | 78.74 mm |
| April | 13.8 °C | 28.6 °C | 74.68 mm |
| May | 17.4 °C | 31.3 °C | 99.82 mm |
| June | 21.2 °C | 32.9 °C | 210.06 mm |
| July | 22.2 °C | 33.6 °C | 197.36 mm |
| August | 22.4 °C | 33.4 °C | 221.23 mm |
| September | 21.2 °C | 31.9 °C | 183.9 mm |
| October | 17.3 °C | 29.1 °C | 96.01 mm |
| November | 12.3 °C | 25.1 °C | 52.07 mm |
| December | 9.2 °C | 22.3 °C | 66.04 mm |
| Annual | 15.3 °C | 28.1 °C | 1418.59 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 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |