| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 48°F | 37°F | 4.1" |
| February | 28°F | 49°F | 37°F | 2.4" |
| March | 35°F | 60°F | 47°F | 3.1" |
| April | 43°F | 70°F | 56°F | 4.1" |
| May | 52°F | 77°F | 64°F | 2.9" |
| June | 61°F | 85°F | 72°F | 3.6" |
| July | 64°F | 86°F | 74°F | 5.0" |
| August | 64°F | 88°F | 75°F | 2.9" |
| September | 57°F | 81°F | 68°F | 3.8" |
| October | 45°F | 70°F | 56°F | 2.7" |
| November | 34°F | 60°F | 46°F | 2.7" |
| December | 30°F | 50°F | 39°F | 4.3" |
| Index | Elizabethton | Tennessee | National |
| Air quality index | 45 | 76 | 42 |
| Pollution index | 1,072,440 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 108 |
| Days w/ poor A.Q. for sensitive groups | 21 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Elk Park, NC | 495 | 26 | 48.0% |
| Roan Mountain, TN | 1,064 | 26 | 48.0% |
| Pine Crest, TN | 2,318 | 45 | 10.0% |
| Oak Grove, TN | 4,353 | 45 | 10.0% |
| Unicoi, TN | 3,572 | 45 | 10.0% |
| Elizabethton, TN | 13,568 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Monroe, GA | 13,568 | 44 | 12.0% |
| Ardmore, PA | 13,567 | 51 | 2.0% |
| Levelland, TX | 13,566 | 25 | 50.0% |
| Vadnais Heights, MN | 13,565 | 46 | 8.0% |
| South Glengarry, ON | 13,573 | n/a | |
| Elizabethton, TN | 13,568 | 45 | 10.0% |
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