| 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 | Jonesborough | 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. |
| Watauga, TN | 781 | 45 | 10.0% |
| Bluff City, TN | 2,093 | 45 | 10.0% |
| Johnson City, TN | 66,934 | 45 | 10.0% |
| Gray, TN | 1,342 | 45 | 10.0% |
| Erwin, TN | 5,910 | 45 | 10.0% |
| Jonesborough, TN | 5,539 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Sierra View, PA | 5,539 | 34 | 32.0% |
| Apple Valley, OH | 5,538 | 41 | 18.0% |
| Lake Bluff, IL | 5,540 | 39 | 22.0% |
| Zeeland, MI | 5,540 | 38 | 24.0% |
| Exeter, PA | 5,540 | 38 | 24.0% |
| Jonesborough, TN | 5,539 | 45 | 10.0% |
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