| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 51°F | 40°F | 4.1" |
| February | 33°F | 53°F | 42°F | 3.4" |
| March | 41°F | 65°F | 52°F | 5.8" |
| April | 50°F | 74°F | 62°F | 5.8" |
| May | 58°F | 81°F | 69°F | 6.0" |
| June | 67°F | 89°F | 77°F | 4.8" |
| July | 69°F | 91°F | 79°F | 4.2" |
| August | 68°F | 91°F | 79°F | 3.0" |
| September | 61°F | 85°F | 72°F | 3.6" |
| October | 48°F | 74°F | 60°F | 3.5" |
| November | 39°F | 63°F | 50°F | 4.0" |
| December | 34°F | 53°F | 43°F | 5.5" |
| Index | Gibson | Tennessee | National |
| Air quality index | 27 | 76 | 42 |
| Pollution index | 1,455,910 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 330 |
| Days with moderate air quality | 32 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dyer, TN | 2,663 | 26 | 48.0% |
| Bells, TN | 2,697 | 27 | 46.0% |
| Humboldt, TN | 8,145 | 27 | 46.0% |
| Trenton, TN | 4,197 | 27 | 46.0% |
| Atwood, TN | 1,122 | 27 | 46.0% |
| Gibson, TN | 546 | 27 | 46.0% |
| City | Population | Air Quality Index | National Avg. |
| Grannis, AR | 546 | 39 | 22.0% |
| Helen, GA | 546 | 37 | 26.0% |
| Dayton, ID | 546 | 44 | 12.0% |
| Warren, MA | 546 | 40 | 20.0% |
| Valier, MT | 546 | 21 | 58.0% |
| Gibson, TN | 546 | 27 | 46.0% |
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