| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 51°F | 38°F | 10.2" |
| February | 30°F | 53°F | 40°F | 5.8" |
| March | 38°F | 64°F | 49°F | 5.1" |
| April | 45°F | 73°F | 58°F | 7.5" |
| May | 53°F | 79°F | 65°F | 4.8" |
| June | 61°F | 85°F | 72°F | 8.0" |
| July | 64°F | 85°F | 73°F | 8.3" |
| August | 63°F | 85°F | 73°F | 7.8" |
| September | 57°F | 81°F | 67°F | 6.9" |
| October | 45°F | 72°F | 56°F | 9.0" |
| November | 35°F | 62°F | 47°F | 11.7" |
| December | 33°F | 55°F | 42°F | 12.6" |
| Index | Copperhill | Tennessee | National |
| Air quality index | 1 | 76 | 42 |
| Pollution index | 567,884 | 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 | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Benton, TN | 1,256 | 1 | 98.0% |
| Epworth, GA | 320 | 1 | 98.0% |
| Ducktown, TN | 561 | 1 | 98.0% |
| McCaysville, GA | 1,536 | 1 | 98.0% |
| Morganton, GA | 297 | 1 | 98.0% |
| Copperhill, TN | 474 | 1 | 98.0% |
| City | Population | Air Quality Index | National Avg. |
| McNeil, AR | 474 | 35 | 30.0% |
| Siloam, GA | 474 | 44 | 12.0% |
| Wapella, IL | 474 | 44 | 12.0% |
| Bentley, KS | 474 | 40 | 20.0% |
| Glasco, KS | 474 | 32 | 36.0% |
| Copperhill, TN | 474 | 1 | 98.0% |
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