| 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 | Jefferson City | Tennessee | National |
| Air quality index | 44 | 76 | 42 |
| Pollution index | 20,443,500 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 234 |
| Days with good air quality | 197 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.050% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Dandridge, TN | 3,162 | 44 | 12.0% |
| New Market, TN | 1,576 | 44 | 12.0% |
| White Pine, TN | 2,397 | 44 | 12.0% |
| Morristown, TN | 29,887 | 44 | 12.0% |
| Rutledge, TN | 1,477 | 44 | 12.0% |
| Jefferson City, TN | 8,220 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Temple Hills, MD | 8,221 | 47 | 6.0% |
| Manhattan, IL | 8,218 | 55 | 10.0% |
| Geneseo, NY | 8,218 | 37 | 26.0% |
| Dryden, ON | 8,222 | n/a | |
| Orono, MN | 8,217 | 46 | 8.0% |
| Jefferson City, TN | 8,220 | 44 | 12.0% |
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