| 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 | Neptune 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. |
| Palm Valley, FL | 20,540 | 43 | 14.0% |
| Atlantic Beach, FL | 13,831 | 43 | 14.0% |
| Sawgrass, FL | 4,094 | 43 | 14.0% |
| Fruit Cove, FL | 33,038 | 43 | 14.0% |
| Jacksonville Beach, FL | 23,562 | 43 | 14.0% |
| Neptune Beach, FL | 7,214 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Dunellen, NJ | 7,215 | 51 | 2.0% |
| Umatilla, OR | 7,215 | 37 | 26.0% |
| Lago Vista, TX | 7,212 | 44 | 12.0% |
| Riverdale Park, MD | 7,216 | 47 | 6.0% |
| Seward, NE | 7,210 | 31 | 38.0% |
| Neptune Beach, FL | 7,214 | 43 | 14.0% |
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