| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 54°F | 41°F | 5.0" |
| February | 32°F | 57°F | 44°F | 3.9" |
| March | 41°F | 67°F | 53°F | 4.8" |
| April | 49°F | 77°F | 62°F | 6.0" |
| May | 57°F | 83°F | 69°F | 3.7" |
| June | 66°F | 91°F | 78°F | 3.4" |
| July | 70°F | 92°F | 80°F | 5.5" |
| August | 70°F | 92°F | 80°F | 4.2" |
| September | 63°F | 87°F | 73°F | 4.5" |
| October | 50°F | 76°F | 62°F | 4.3" |
| November | 38°F | 65°F | 51°F | 4.5" |
| December | 35°F | 56°F | 45°F | 6.5" |
| Index | Harrison | Tennessee | National |
| Air quality index | 46 | 76 | 42 |
| Pollution index | 271,356 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 230 |
| Days with moderate air quality | 135 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| 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. |
| South Cleveland, TN | 7,792 | 1 | 98.0% |
| Hopewell, TN | 2,051 | 1 | 98.0% |
| Cohutta, GA | 700 | 43 | 14.0% |
| Fairview, GA | 5,919 | 46 | 8.0% |
| Lookout Mountain, GA | 1,629 | 46 | 8.0% |
| Harrison, TN | 8,485 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Glastonbury Center, CT | 8,483 | 41 | 18.0% |
| Hanover, ON | 8,487 | n/a | |
| Conover, NC | 8,488 | 43 | 14.0% |
| Edson, AB | 8,481 | n/a | |
| Harrodsburg, KY | 8,480 | 42 | 16.0% |
| Harrison, TN | 8,485 | 46 | 8.0% |
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