| 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 | Viola | Tennessee | National |
| Air quality index | 25 | 76 | 42 |
| Pollution index | 811,864 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 351 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| McMinnville, TN | 13,707 | 25 | 50.0% |
| New Union, TN | 1,819 | 25 | 50.0% |
| Morrison, TN | 687 | 25 | 50.0% |
| Centertown, TN | 324 | 25 | 50.0% |
| Gruetli-Laager, TN | 1,931 | 46 | 8.0% |
| Viola, TN | 141 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Talladega Springs, AL | 141 | 38 | 24.0% |
| Leipsic, DE | 141 | 42 | 16.0% |
| Dover, IL | 141 | 0 | 100.0% |
| Mound Station, IL | 141 | 41 | 18.0% |
| Hardinsburg, IN | 141 | 6 | 88.0% |
| Viola, TN | 141 | 25 | 50.0% |
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