| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 65°F | 77°F | 70°F | 2.3" |
| February | 66°F | 78°F | 71°F | 1.8" |
| March | 69°F | 80°F | 74°F | 1.4" |
| April | 73°F | 83°F | 78°F | 2.5" |
| May | 76°F | 86°F | 81°F | 3.0" |
| June | 79°F | 89°F | 84°F | 4.3" |
| July | 80°F | 90°F | 85°F | 4.3" |
| August | 80°F | 91°F | 85°F | 5.5" |
| September | 79°F | 90°F | 85°F | 7.0" |
| October | 77°F | 86°F | 81°F | 5.4" |
| November | 71°F | 81°F | 76°F | 2.3" |
| December | 69°F | 79°F | 73°F | 2.1" |
| Index | Cudjoe Key | Florida | National |
| Air quality index | 34 | 35 | 42 |
| Pollution index | 43,296,200 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 331 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.510% |
| Carbon Tetrachloride | 0.150% |
| Lead | 0.330% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Big Coppitt Key, FL | 2,712 | 34 | 32.0% |
| Big Pine Key, FL | 4,970 | 41 | 18.0% |
| Cudjoe Key, FL | 2,231 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Madison, NC | 2,231 | 43 | 14.0% |
| Mineralwells, WV | 2,231 | 35 | 30.0% |
| Saint-Damien, QC | 2,231 | n/a | |
| Colquitt, GA | 2,230 | 35 | 30.0% |
| Apalachin, NY | 2,230 | 36 | 28.0% |
| Cudjoe Key, FL | 2,231 | 34 | 32.0% |