Lake Helen, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.6 °C (low) to 27.8 °C (high). Annual precipitation averages 1408.4 Millimeters. Lake Helen is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.4 °C | 21.1 °C | 76.96 mm |
| February | 8.9 °C | 22.6 °C | 60.96 mm |
| March | 11 °C | 25.2 °C | 82.55 mm |
| April | 14.2 °C | 28 °C | 71.12 mm |
| May | 17.8 °C | 30.6 °C | 99.82 mm |
| June | 21.4 °C | 32.3 °C | 198.88 mm |
| July | 22.4 °C | 33.2 °C | 201.17 mm |
| August | 22.6 °C | 32.9 °C | 204.72 mm |
| September | 21.5 °C | 31.4 °C | 188.21 mm |
| October | 17.6 °C | 28.6 °C | 102.62 mm |
| November | 12.6 °C | 24.9 °C | 57.15 mm |
| December | 9.5 °C | 22.3 °C | 64.26 mm |
| Annual | 15.6 °C | 27.8 °C | 1408.42 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 |