| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 47°F | 66°F | 56°F | 3.1" |
| February | 48°F | 68°F | 57°F | 2.6" |
| March | 54°F | 73°F | 63°F | 2.3" |
| April | 61°F | 78°F | 69°F | 3.0" |
| May | 67°F | 84°F | 75°F | 4.0" |
| June | 73°F | 89°F | 80°F | 6.4" |
| July | 75°F | 90°F | 82°F | 5.0" |
| August | 76°F | 90°F | 82°F | 6.4" |
| September | 74°F | 87°F | 80°F | 6.1" |
| October | 66°F | 80°F | 73°F | 3.5" |
| November | 56°F | 73°F | 64°F | 3.5" |
| December | 52°F | 69°F | 60°F | 2.7" |
| Index | Fernandina Beach | Florida | National |
| Air quality index | 43 | 35 | 42 |
| Pollution index | 6,554,710 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 245 |
| Days with moderate air quality | 119 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.070% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Kingsland, GA | 18,088 | 36 | 28.0% |
| Kings Bay Base, GA | 3,177 | 36 | 28.0% |
| St. Marys, GA | 18,720 | 36 | 28.0% |
| Yulee, FL | 13,794 | 43 | 14.0% |
| Fernandina Beach, FL | 13,006 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| San Anselmo, CA | 13,003 | 40 | 20.0% |
| Lakeside, VA | 13,009 | 44 | 12.0% |
| Lansdowne, VA | 13,013 | 47 | 6.0% |
| Georgetown, GA | 12,996 | 39 | 22.0% |
| Trinity, FL | 13,016 | 43 | 14.0% |
| Fernandina Beach, FL | 13,006 | 43 | 14.0% |