| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 52°F | 43°F | 7.2" |
| February | 32°F | 52°F | 42°F | 3.3" |
| March | 43°F | 68°F | 55°F | 6.3" |
| April | 48°F | 71°F | 60°F | 4.8" |
| May | 56°F | 83°F | 71°F | 4.4" |
| June | 67°F | 91°F | 79°F | 3.3" |
| July | 71°F | 92°F | 81°F | 2.2" |
| August | 73°F | 99°F | 87°F | 1.6" |
| September | 64°F | 91°F | 78°F | 4.0" |
| October | 52°F | 77°F | 65°F | 9.6" |
| November | 41°F | 65°F | 53°F | 6.3" |
| December | 34°F | 53°F | 43°F | 6.0" |
| Index | Unionville | Tennessee | National |
| Air quality index | 31 | 76 | 42 |
| Pollution index | 2,130,950 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 116 |
| Days with good air quality | 99 |
| Days with moderate air quality | 17 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bell Buckle, TN | 647 | 31 | 38.0% |
| Rockvale, TN | 1,592 | 31 | 38.0% |
| Chapel Hill, TN | 1,502 | 31 | 38.0% |
| Shelbyville, TN | 21,841 | 31 | 38.0% |
| Christiana, TN | 4,701 | 31 | 38.0% |
| Unionville, TN | 2,615 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Cedaredge, CO | 2,614 | 44 | 12.0% |
| Maxton, NC | 2,614 | 30 | 40.0% |
| Landrum, SC | 2,614 | 44 | 12.0% |
| Black River-Matheson, ON | 2,614 | n/a | |
| Marietta, PA | 2,616 | 41 | 18.0% |
| Unionville, TN | 2,615 | 31 | 38.0% |
Here are the best places to live in Tennessee
Check out the 10 safest cities in Tennessee
Check out the 10 most dangerous cities in Tennessee
Most Dangerous Cities In The US