Key West, Florida has a Tropical Savanna (Wet and Dry Climate) climate (Köppen classification: Aw). Average annual temperatures range from 73.2 °F (low) to 83.1 °F (high). Annual precipitation averages 43.3 Inches. Key West is located in USDA Plant Hardiness Zone 11b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 64.4 °F | 74.7 °F | 1.71 in. |
| February | 66.0 °F | 76.5 °F | 2.06 in. |
| March | 68.4 °F | 78.5 °F | 1.53 in. |
| April | 72.4 °F | 82.4 °F | 2.26 in. |
| May | 75.7 °F | 85.4 °F | 3.09 in. |
| June | 78.7 °F | 88.3 °F | 4.7 in. |
| July | 79.7 °F | 90.1 °F | 4.14 in. |
| August | 79.8 °F | 90.0 °F | 5.49 in. |
| September | 78.6 °F | 88.6 °F | 7.24 in. |
| October | 76.3 °F | 85.3 °F | 6.55 in. |
| November | 71.3 °F | 80.1 °F | 2.45 in. |
| December | 67.6 °F | 76.8 °F | 2.03 in. |
| Annual | 73.2 °F | 83.1 °F | 43.25 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 11b : 45°F to 40°F |
| Plant Hardiness Zone - 2012 | Zone 11b : 45°F to 40°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Aw - Tropical Savanna (Wet and Dry Climate) |