Cedar Key, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 63.2 °F (low) to 77.5 °F (high). Annual precipitation averages 47.8 Inches. Cedar Key is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 47.4 °F | 63.5 °F | 3.75 in. |
| February | 50.6 °F | 66.3 °F | 2.75 in. |
| March | 55.4 °F | 70.9 °F | 3.43 in. |
| April | 62.2 °F | 76.6 °F | 2.8 in. |
| May | 68.9 °F | 82.7 °F | 1.97 in. |
| June | 74.8 °F | 86.7 °F | 5.27 in. |
| July | 76.5 °F | 88.0 °F | 7.14 in. |
| August | 76.4 °F | 88.2 °F | 8.89 in. |
| September | 73.2 °F | 86.4 °F | 5.09 in. |
| October | 65.4 °F | 80.8 °F | 2.58 in. |
| November | 56.1 °F | 72.9 °F | 1.63 in. |
| December | 50.9 °F | 66.4 °F | 2.48 in. |
| Annual | 63.2 °F | 77.5 °F | 47.78 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |