| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 50°F | 41°F | 8.8" |
| February | 31°F | 49°F | 39°F | 6.3" |
| March | 41°F | 64°F | 51°F | 4.7" |
| April | 47°F | 69°F | 57°F | 7.6" |
| May | 55°F | 80°F | 67°F | 5.2" |
| June | 64°F | 87°F | 75°F | 12.3" |
| July | 68°F | 89°F | 78°F | 3.3" |
| August | 70°F | 94°F | 81°F | 9.5" |
| September | 62°F | 85°F | 73°F | 5.3" |
| October | 52°F | 75°F | 63°F | 11.8" |
| November | 37°F | 59°F | 47°F | 5.4" |
| December | 31°F | 49°F | 39°F | 8.4" |
| Index | Clarksville | Tennessee | National |
| Air quality index | 40 | 76 | 42 |
| Pollution index | 5,501,360 | 2,454,916 | 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. |
| Guthrie, KY | 1,301 | 40 | 20.0% |
| Fort Campbell North, KY | 14,363 | 40 | 20.0% |
| Walnut Grove CDP (Hardin County), TN | 252 | 40 | 20.0% |
| Oak Grove, KY | 7,332 | 40 | 20.0% |
| Walnut Grove, TN | 931 | 40 | 20.0% |
| Clarksville, TN | 156,092 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Salinas, CA | 156,177 | 37 | 26.0% |
| Lakewood, CO | 155,733 | 58 | 16.0% |
| Lancaster, CA | 157,697 | 72 | 44.0% |
| Alexandria, VA | 158,309 | 47 | 6.0% |
| Hollywood, FL | 153,834 | 41 | 18.0% |
| Clarksville, TN | 156,092 | 40 | 20.0% |
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