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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 46°F | 36°F | 4.7" |
| February | 31°F | 50°F | 40°F | 4.6" |
| March | 39°F | 60°F | 49°F | 5.7" |
| April | 48°F | 71°F | 59°F | 5.8" |
| May | 55°F | 76°F | 65°F | 4.4" |
| June | 62°F | 82°F | 72°F | 5.0" |
| July | 66°F | 84°F | 75°F | 6.8" |
| August | 65°F | 84°F | 74°F | 3.8" |
| September | 58°F | 79°F | 68°F | 4.1" |
| October | 47°F | 70°F | 58°F | 3.6" |
| November | 38°F | 59°F | 48°F | 4.8" |
| December | 33°F | 50°F | 41°F | 6.4" |
| Index | Dayton | Tennessee | National |
| Air quality index | 1 | 76 | 42 |
| Pollution index | 271,356 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 363 |
| Days with moderate air quality | 2 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Charleston, TN | 668 | 1 | 98.0% |
| Sale Creek, TN | 2,899 | 1 | 98.0% |
| Graysville, TN | 1,644 | 1 | 98.0% |
| Calhoun, TN | 674 | 1 | 98.0% |
| Pikeville, TN | 2,465 | 30 | 40.0% |
| Dayton, TN | 7,357 | 1 | 98.0% |
| City | Population | Air Quality Index | National Avg. |
| Palmer, AK | 7,359 | 31 | 38.0% |
| Hudsonville, MI | 7,353 | 38 | 24.0% |
| Iron Mountain, MI | 7,352 | 36 | 28.0% |
| Globe, AZ | 7,351 | 60 | 20.0% |
| Charles City, IA | 7,351 | 15 | 70.0% |
| Dayton, TN | 7,357 | 1 | 98.0% |
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