| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 51°F | 39°F | 4.8" |
| February | 31°F | 54°F | 42°F | 3.6" |
| March | 39°F | 65°F | 51°F | 4.5" |
| April | 47°F | 75°F | 61°F | 5.5" |
| May | 56°F | 81°F | 68°F | 3.6" |
| June | 65°F | 88°F | 76°F | 3.8" |
| July | 68°F | 90°F | 78°F | 5.6" |
| August | 67°F | 90°F | 78°F | 4.0" |
| September | 61°F | 84°F | 72°F | 4.4" |
| October | 48°F | 74°F | 60°F | 3.4" |
| November | 37°F | 63°F | 49°F | 4.1" |
| December | 32°F | 54°F | 42°F | 6.2" |
| Index | Knoxville | Tennessee | National |
| Air quality index | 46 | 76 | 42 |
| Pollution index | 1,511,600 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 227 |
| Days with moderate air quality | 135 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Seymour, TN | 15,444 | 44 | 12.0% |
| Alcoa, TN | 9,809 | 46 | 8.0% |
| Friendsville, TN | 1,050 | 46 | 8.0% |
| Clinton, TN | 10,006 | 46 | 8.0% |
| Louisville, TN | 4,151 | 46 | 8.0% |
| Knoxville, TN | 187,487 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Frisco, TX | 188,387 | 51 | 2.0% |
| Cape Coral, FL | 189,633 | 36 | 28.0% |
| Worcester, MA | 185,186 | 40 | 20.0% |
| Shreveport, LA | 189,890 | 39 | 22.0% |
| Mobile, AL | 189,994 | 42 | 16.0% |
| Knoxville, TN | 187,487 | 46 | 8.0% |
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