Cudjoe Key, Florida has a Tropical Savanna (Wet and Dry Climate) climate (Köppen classification: Aw). Average annual temperatures range from 23 °C (low) to 28.2 °C (high). Annual precipitation averages 1125.7 Millimeters. Cudjoe Key is located in USDA Plant Hardiness Zone 11b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.1 °C | 23.5 °C | 45.97 mm |
| February | 18.9 °C | 24.6 °C | 49.78 mm |
| March | 20.3 °C | 25.7 °C | 34.8 mm |
| April | 22.5 °C | 27.8 °C | 58.42 mm |
| May | 24.3 °C | 29.5 °C | 97.79 mm |
| June | 26 °C | 31.2 °C | 132.08 mm |
| July | 26.6 °C | 31.9 °C | 119.38 mm |
| August | 26.7 °C | 32.1 °C | 161.29 mm |
| September | 25.9 °C | 31.2 °C | 185.93 mm |
| October | 24.7 °C | 29.2 °C | 153.42 mm |
| November | 21.9 °C | 26.5 °C | 41.4 mm |
| December | 19.8 °C | 24.8 °C | 45.47 mm |
| Annual | 23 °C | 28.2 °C | 1125.73 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 11b : 7.2°C to 10°C |
| Plant Hardiness Zone - 2012 | Zone 11b : 7.2°C to 10°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Aw - Tropical Savanna (Wet and Dry Climate) |