Key Largo, Florida has a Tropical Savanna (Wet and Dry Climate) climate (Köppen classification: Aw). Average annual temperatures range from 22.8 °C (low) to 28 °C (high). Annual precipitation averages 1191.3 Millimeters. Key Largo is located in USDA Plant Hardiness Zone 11a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.8 °C | 23.7 °C | 49.78 mm |
| February | 18.7 °C | 24.4 °C | 43.18 mm |
| March | 20 °C | 25.5 °C | 41.66 mm |
| April | 22.2 °C | 27.5 °C | 55.63 mm |
| May | 24.2 °C | 29 °C | 95.5 mm |
| June | 25.6 °C | 30.5 °C | 163.58 mm |
| July | 26.4 °C | 31.7 °C | 112.27 mm |
| August | 26.7 °C | 31.6 °C | 154.43 mm |
| September | 25.9 °C | 30.8 °C | 200.66 mm |
| October | 24.5 °C | 29.3 °C | 153.16 mm |
| November | 21.6 °C | 26.6 °C | 64.26 mm |
| December | 19.6 °C | 24.9 °C | 57.15 mm |
| Annual | 22.8 °C | 28 °C | 1191.26 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 11a : 4.4°C to 7.2°C |
| Plant Hardiness Zone - 2012 | Zone 11a : 4.4°C to 7.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Aw - Tropical Savanna (Wet and Dry Climate) |