| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 47°F | 67°F | 56°F | 3.1" |
| February | 49°F | 70°F | 59°F | 2.9" |
| March | 55°F | 76°F | 65°F | 2.8" |
| April | 63°F | 82°F | 72°F | 2.6" |
| May | 69°F | 87°F | 77°F | 4.8" |
| June | 75°F | 92°F | 82°F | 8.1" |
| July | 77°F | 93°F | 84°F | 6.4" |
| August | 77°F | 93°F | 84°F | 6.7" |
| September | 75°F | 89°F | 81°F | 4.7" |
| October | 66°F | 83°F | 74°F | 3.4" |
| November | 56°F | 75°F | 65°F | 1.8" |
| December | 52°F | 71°F | 60°F | 2.9" |
| Index | Highlands | Jacksonville | Florida |
| Air quality index | 43 | 43 | 35 |
| Pollution index | 6,554,710 | 6,554,710 | 7,570,785 |
| 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. |
| Callahan, FL | 1,408 | 43 | 14.0% |
| Nassau Village-Ratliff, FL | 4,789 | 43 | 14.0% |
| Yulee, FL | 13,346 | 43 | 14.0% |
| Jacksonville, FL | 902,488 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Fort Worth, TX | 892,221 | 51 | 2.0% |
| Columbus, OH | 889,079 | 46 | 8.0% |
| San Francisco, CA | 874,784 | 40 | 20.0% |
| Charlotte, NC | 873,570 | 49 | 2.0% |
| Indianapolis, IN | 869,387 | 54 | 8.0% |
| Jacksonville, FL | 902,488 | 43 | 14.0% |
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