Charlotte Harbor, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 18.1 °C (low) to 29.1 °C (high). Annual precipitation averages 1392.4 Millimeters. Charlotte Harbor is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.2 °C | 23.5 °C | 57.91 mm |
| February | 12.6 °C | 24.9 °C | 49.28 mm |
| March | 14.2 °C | 26.7 °C | 69.85 mm |
| April | 17.1 °C | 29.2 °C | 60.96 mm |
| May | 19.9 °C | 31.5 °C | 91.95 mm |
| June | 22.8 °C | 32.6 °C | 246.38 mm |
| July | 23.6 °C | 32.9 °C | 210.82 mm |
| August | 23.7 °C | 33.1 °C | 232.66 mm |
| September | 23.1 °C | 32.4 °C | 195.07 mm |
| October | 20.4 °C | 30.4 °C | 84.84 mm |
| November | 15.7 °C | 27.1 °C | 42.16 mm |
| December | 13.1 °C | 24.8 °C | 50.55 mm |
| Annual | 18.1 °C | 29.1 °C | 1392.43 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°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 |