Fernandina Beach, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 61.7 °F (low) to 76.8 °F (high). Annual precipitation averages 50.8 Inches. Fernandina Beach is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.9 °F | 62.6 °F | 3.6 in. |
| February | 47.6 °F | 65.0 °F | 3.3 in. |
| March | 53.1 °F | 70.1 °F | 3.19 in. |
| April | 60.2 °F | 76.0 °F | 3.02 in. |
| May | 67.6 °F | 82.1 °F | 2.78 in. |
| June | 73.5 °F | 87.0 °F | 6.27 in. |
| July | 75.5 °F | 89.5 °F | 5.41 in. |
| August | 75.3 °F | 88.5 °F | 5.99 in. |
| September | 73.2 °F | 85.4 °F | 7.25 in. |
| October | 65.2 °F | 79.0 °F | 4.8 in. |
| November | 55.1 °F | 70.9 °F | 1.93 in. |
| December | 48.8 °F | 65.0 °F | 3.25 in. |
| Annual | 61.7 °F | 76.8 °F | 50.79 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |