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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 49°F | 41°F | 8.3" |
| February | 31°F | 49°F | 39°F | 5.6" |
| March | 42°F | 65°F | 52°F | 2.7" |
| April | 48°F | 70°F | 58°F | 6.3" |
| May | 56°F | 80°F | 68°F | 5.2" |
| June | 65°F | 87°F | 75°F | 4.9" |
| July | 69°F | 89°F | 78°F | 5.1" |
| August | 71°F | 94°F | 82°F | 12.1" |
| September | 63°F | 85°F | 73°F | 5.3" |
| October | 52°F | 74°F | 62°F | 16.9" |
| November | 40°F | 62°F | 50°F | 4.5" |
| December | 32°F | 49°F | 39°F | 7.8" |
| Index | LaFayette | 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. |
| Cadiz, KY | 2,668 | 40 | 20.0% |
| Fort Campbell North, KY | 14,363 | 40 | 20.0% |
| Dover, TN | 1,661 | 40 | 20.0% |
| Hopkinsville, KY | 31,052 | 40 | 20.0% |
| Oak Grove, KY | 7,332 | 40 | 20.0% |
| LaFayette, KY | 168 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Marshall, AK | 168 | 31 | 38.0% |
| Sedgwick, AR | 168 | 45 | 10.0% |
| Elgin, AZ | 168 | 45 | 10.0% |
| La Junta Gardens, CO | 168 | 20 | 60.0% |
| Makena, HI | 168 | 15 | 70.0% |
| LaFayette, KY | 168 | 40 | 20.0% |
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