| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 55°F | 77°F | 65°F | 1.4" |
| February | 54°F | 76°F | 64°F | 4.6" |
| March | 58°F | 81°F | 69°F | 6.4" |
| April | 60°F | 84°F | 72°F | 7.9" |
| May | 67°F | 88°F | 77°F | 4.3" |
| June | 73°F | 89°F | 80°F | 18.0" |
| July | 76°F | 93°F | 83°F | 9.0" |
| August | 76°F | 94°F | 83°F | 10.5" |
| September | 74°F | 91°F | 81°F | 8.3" |
| October | 71°F | 88°F | 78°F | 7.6" |
| November | 62°F | 82°F | 71°F | 10.2" |
| December | 57°F | 79°F | 67°F | 1.1" |
| Index | Harlem | Florida | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 30,648,300 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 353 |
| Days with good air quality | 324 |
| Days with moderate air quality | 29 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.370% |
| Carbon Tetrachloride | 0.080% |
| Lead | 0.150% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Montura, FL | 3,514 | 34 | 32.0% |
| Lake Harbor, FL | 60 | 36 | 28.0% |
| South Bay, FL | 6,665 | 36 | 28.0% |
| Moore Haven, FL | 2,302 | 36 | 28.0% |
| Clewiston, FL | 7,910 | 36 | 28.0% |
| Harlem, FL | 2,705 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Ford Heights, IL | 2,705 | 55 | 10.0% |
| Belmont, PA | 2,705 | 39 | 22.0% |
| North Crossett, AR | 2,704 | 35 | 30.0% |
| Peterborough, NH | 2,704 | 34 | 32.0% |
| Enniskillen, ON | 2,704 | n/a | |
| Harlem, FL | 2,705 | 36 | 28.0% |
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