| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 48°F | 36°F | 4.1" |
| February | 28°F | 50°F | 38°F | 3.3" |
| March | 38°F | 63°F | 50°F | 5.5" |
| April | 47°F | 74°F | 60°F | 5.8" |
| May | 55°F | 80°F | 68°F | 4.9" |
| June | 65°F | 89°F | 77°F | 4.3" |
| July | 68°F | 91°F | 79°F | 5.2" |
| August | 66°F | 91°F | 78°F | 4.1" |
| September | 59°F | 85°F | 71°F | 3.9" |
| October | 47°F | 74°F | 59°F | 3.9" |
| November | 36°F | 62°F | 48°F | 4.2" |
| December | 29°F | 50°F | 39°F | 5.4" |
| Index | Grand Rivers | Kentucky | National |
| Air quality index | 44 | 45 | 42 |
| Pollution index | 5,501,360 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 261 |
| Days with moderate air quality | 103 |
| 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. |
| Eddyville, KY | 2,556 | 44 | 12.0% |
| Ledbetter, KY | 1,720 | 44 | 12.0% |
| Benton, KY | 4,498 | 44 | 12.0% |
| Fredonia, KY | 464 | 44 | 12.0% |
| Smithland, KY | 332 | 44 | 12.0% |
| Grand Rivers, KY | 421 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Pilot Station, AK | 421 | 31 | 38.0% |
| Newdale, ID | 421 | 43 | 14.0% |
| Virgil, IL | 421 | 42 | 16.0% |
| North Salem, IN | 421 | 54 | 8.0% |
| Lakeview Heights, KY | 421 | 14 | 72.0% |
| Grand Rivers, KY | 421 | 44 | 12.0% |
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