| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 50°F | 41°F | 8.8" |
| February | 31°F | 49°F | 39°F | 6.3" |
| March | 41°F | 64°F | 51°F | 4.7" |
| April | 47°F | 69°F | 57°F | 7.6" |
| May | 55°F | 80°F | 67°F | 5.2" |
| June | 64°F | 87°F | 75°F | 12.3" |
| July | 68°F | 89°F | 78°F | 3.3" |
| August | 70°F | 94°F | 81°F | 9.5" |
| September | 62°F | 85°F | 73°F | 5.3" |
| October | 52°F | 75°F | 63°F | 11.8" |
| November | 37°F | 59°F | 47°F | 5.4" |
| December | 31°F | 49°F | 39°F | 8.4" |
| Index | McEwen | Tennessee | National |
| Air quality index | 40 | 76 | 42 |
| Pollution index | 9,326,120 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 307 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.180% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.070% |
| Mercury | 0.150% |
| City | Population | Air Quality Index | National Avg. |
| Vanleer, TN | 418 | 40 | 20.0% |
| Erin, TN | 1,706 | 40 | 20.0% |
| Tennessee Ridge, TN | 1,296 | 40 | 20.0% |
| Slayden, TN | 123 | 40 | 20.0% |
| Waverly, TN | 4,124 | 40 | 20.0% |
| McEwen, TN | 1,802 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Moodus, CT | 1,802 | 37 | 26.0% |
| Remsen, IA | 1,802 | 35 | 30.0% |
| Walcott, IA | 1,802 | 46 | 8.0% |
| Syracuse, KS | 1,802 | 15 | 70.0% |
| Marks, MS | 1,802 | 33 | 34.0% |
| McEwen, TN | 1,802 | 40 | 20.0% |
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