| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 48°F | 37°F | 3.2" |
| February | 31°F | 52°F | 40°F | 3.5" |
| March | 39°F | 62°F | 50°F | 5.1" |
| April | 48°F | 73°F | 60°F | 5.2" |
| May | 57°F | 80°F | 68°F | 3.9" |
| June | 65°F | 87°F | 76°F | 3.8" |
| July | 69°F | 89°F | 78°F | 6.0" |
| August | 67°F | 89°F | 77°F | 3.4" |
| September | 59°F | 83°F | 70°F | 3.2" |
| October | 48°F | 73°F | 60°F | 3.7" |
| November | 38°F | 61°F | 49°F | 4.6" |
| December | 33°F | 51°F | 41°F | 4.6" |
| Index | Trenton | Kentucky | National |
| Air quality index | 40 | 45 | 42 |
| Pollution index | 5,501,360 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 307 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.800% |
| City | Population | Air Quality Index | National Avg. |
| Adams, TN | 602 | 40 | 20.0% |
| Oak Grove, KY | 7,332 | 40 | 20.0% |
| Clarksville, TN | 156,092 | 40 | 20.0% |
| Walnut Grove, TN | 931 | 40 | 20.0% |
| Cedar Hill, TN | 271 | 40 | 20.0% |
| Trenton, KY | 402 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Montrose, AR | 402 | 43 | 14.0% |
| Danbury, IA | 402 | 35 | 30.0% |
| Rothbury, MI | 402 | 38 | 24.0% |
| Osborn, MO | 402 | 43 | 14.0% |
| Purcell, MO | 402 | 37 | 26.0% |
| Trenton, KY | 402 | 40 | 20.0% |
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