Big Coppitt Key, Florida has a Tropical Savanna (Wet and Dry Climate) climate (Köppen classification: Aw). Average annual temperatures range from 73.3 °F (low) to 82.8 °F (high). Annual precipitation averages 42.4 Inches. Big Coppitt Key is located in USDA Plant Hardiness Zone 11b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 64.4 °F | 74.4 °F | 1.74 in. |
| February | 66.0 °F | 76.4 °F | 2.02 in. |
| March | 68.5 °F | 78.4 °F | 1.47 in. |
| April | 72.5 °F | 82.1 °F | 2.36 in. |
| May | 75.8 °F | 85.1 °F | 3.76 in. |
| June | 78.7 °F | 88.1 °F | 5.0 in. |
| July | 79.8 °F | 89.6 °F | 3.68 in. |
| August | 79.9 °F | 89.8 °F | 5.23 in. |
| September | 78.7 °F | 88.4 °F | 6.98 in. |
| October | 76.3 °F | 85.0 °F | 6.21 in. |
| November | 71.4 °F | 79.9 °F | 2.06 in. |
| December | 67.6 °F | 76.7 °F | 1.89 in. |
| Annual | 73.3 °F | 82.8 °F | 42.4 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) |