| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 68°F | 53°F | 3.3" |
| February | 42°F | 71°F | 55°F | 3.2" |
| March | 47°F | 76°F | 61°F | 2.4" |
| April | 54°F | 82°F | 68°F | 3.2" |
| May | 61°F | 87°F | 74°F | 4.3" |
| June | 69°F | 91°F | 79°F | 7.6" |
| July | 72°F | 92°F | 81°F | 5.8" |
| August | 73°F | 92°F | 81°F | 7.1" |
| September | 69°F | 88°F | 77°F | 7.1" |
| October | 59°F | 82°F | 70°F | 4.0" |
| November | 48°F | 75°F | 61°F | 1.6" |
| December | 45°F | 72°F | 57°F | 3.0" |
| Index | Yulee | 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. |
| St. Marys, GA | 18,321 | 36 | 28.0% |
| Kings Bay Base, GA | 3,115 | 36 | 28.0% |
| Kingsland, GA | 17,523 | 36 | 28.0% |
| Callahan, FL | 1,408 | 43 | 14.0% |
| Fernandina Beach, FL | 12,622 | 43 | 14.0% |
| Yulee, FL | 13,346 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Powell, OH | 13,353 | 46 | 8.0% |
| Palos Verdes Estates, CA | 13,359 | 72 | 44.0% |
| North Valley, NM | 13,331 | 53 | 6.0% |
| Santa Fe, TX | 13,326 | 52 | 4.0% |
| Montgomeryville, PA | 13,319 | 51 | 2.0% |
| Yulee, FL | 13,346 | 43 | 14.0% |
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