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| 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. |
| Lewisburg, TN | 12,150 | 31 | 38.0% |
| Eagleville, TN | 943 | 31 | 38.0% |
| Bell Buckle, TN | 647 | 31 | 38.0% |
| Rockvale, TN | 1,592 | 31 | 38.0% |
| Chapel Hill, TN | 1,502 | 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% |
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