| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 49°F | 41°F | 9.3" |
| February | 35°F | 51°F | 42°F | 4.3" |
| March | 44°F | 66°F | 54°F | 5.7" |
| April | 50°F | 70°F | 59°F | 5.8" |
| May | 61°F | 83°F | 72°F | 3.6" |
| June | 69°F | 90°F | 79°F | 5.8" |
| July | 70°F | 89°F | 79°F | 8.1" |
| August | 72°F | 96°F | 83°F | 10.3" |
| September | 65°F | 87°F | 75°F | 7.4" |
| October | 54°F | 76°F | 63°F | 13.9" |
| November | 43°F | 63°F | 52°F | 6.9" |
| December | 33°F | 51°F | 41°F | 6.4" |
| Index | Henning | Tennessee | National |
| Air quality index | 26 | 76 | 42 |
| Pollution index | 2,081,500 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 341 |
| Days with moderate air quality | 19 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ripley, TN | 7,852 | 26 | 48.0% |
| Gates, TN | 489 | 26 | 48.0% |
| Covington, TN | 8,863 | 26 | 48.0% |
| Halls, TN | 9,135 | 26 | 48.0% |
| Gilt Edge, TN | 453 | 45 | 10.0% |
| Henning, TN | 1,177 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Balfour, NC | 1,177 | 44 | 12.0% |
| Iva, SC | 1,177 | 31 | 38.0% |
| Redwater, TX | 1,177 | 39 | 22.0% |
| Waitsburg, WA | 1,177 | 23 | 54.0% |
| John d'Or Prairie 215, AB | 1,177 | n/a | |
| Henning, TN | 1,177 | 26 | 48.0% |
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