Longboat Key, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 19.1 °C (low) to 26.7 °C (high). Annual precipitation averages 1576.3 Millimeters. Longboat Key is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.8 °C | 20.6 °C | 90.17 mm |
| February | 13.4 °C | 21.4 °C | 71.63 mm |
| March | 15.5 °C | 23.4 °C | 92.96 mm |
| April | 18.3 °C | 26.1 °C | 74.68 mm |
| May | 21.4 °C | 28.9 °C | 75.95 mm |
| June | 23.9 °C | 30.7 °C | 193.8 mm |
| July | 24.6 °C | 31.4 °C | 239.01 mm |
| August | 24.8 °C | 31.7 °C | 280.16 mm |
| September | 23.9 °C | 31.1 °C | 227.84 mm |
| October | 21.2 °C | 28.6 °C | 97.03 mm |
| November | 16.7 °C | 24.4 °C | 55.12 mm |
| December | 13.7 °C | 21.9 °C | 77.98 mm |
| Annual | 19.1 °C | 26.7 °C | 1576.33 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |