Longboat Key, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 66.4 °F (low) to 80 °F (high). Annual precipitation averages 62.1 Inches. Longboat Key is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 53.2 °F | 69.0 °F | 3.55 in. |
| February | 56.1 °F | 70.6 °F | 2.82 in. |
| March | 59.9 °F | 74.1 °F | 3.66 in. |
| April | 65.0 °F | 79.0 °F | 2.94 in. |
| May | 70.5 °F | 84.1 °F | 2.99 in. |
| June | 75.1 °F | 87.3 °F | 7.63 in. |
| July | 76.3 °F | 88.6 °F | 9.41 in. |
| August | 76.7 °F | 89.0 °F | 11.03 in. |
| September | 75.1 °F | 87.9 °F | 8.97 in. |
| October | 70.1 °F | 83.4 °F | 3.82 in. |
| November | 62.0 °F | 75.9 °F | 2.17 in. |
| December | 56.7 °F | 71.4 °F | 3.07 in. |
| Annual | 66.4 °F | 80 °F | 62.06 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 35°F to 30°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |