| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 65°F | 77°F | 70°F | 1.6" |
| February | 66°F | 78°F | 71°F | 2.1" |
| March | 69°F | 81°F | 74°F | 1.2" |
| April | 73°F | 85°F | 78°F | 2.7" |
| May | 76°F | 88°F | 81°F | 2.8" |
| June | 79°F | 90°F | 84°F | 4.5" |
| July | 79°F | 91°F | 85°F | 4.2" |
| August | 80°F | 92°F | 85°F | 6.4" |
| September | 78°F | 90°F | 84°F | 6.2" |
| October | 76°F | 86°F | 81°F | 6.8" |
| November | 70°F | 81°F | 75°F | 1.9" |
| December | 69°F | 79°F | 73°F | 2.4" |
| Index | Big Pine Key | Florida | National |
| Air quality index | 41 | 35 | 42 |
| Pollution index | 43,296,200 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 284 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| 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. |
| Cudjoe Key, FL | 2,231 | 34 | 32.0% |
| Big Pine Key, FL | 4,970 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Mount Plymouth, FL | 4,969 | 37 | 26.0% |
| Farmington, ME | 4,969 | 28 | 44.0% |
| Tallassee, AL | 4,968 | 52 | 4.0% |
| Doffing, TX | 4,967 | 42 | 16.0% |
| Hamilton, MT | 4,973 | 40 | 20.0% |
| Big Pine Key, FL | 4,970 | 41 | 18.0% |