| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 45°F | 34°F | 5.4" |
| February | 24°F | 46°F | 34°F | 7.3" |
| March | 33°F | 56°F | 44°F | 6.8" |
| April | 47°F | 71°F | 58°F | 9.8" |
| May | 55°F | 80°F | 67°F | 9.3" |
| June | 63°F | 86°F | 74°F | 5.5" |
| July | 63°F | 86°F | 74°F | 7.5" |
| August | 65°F | 86°F | 74°F | 10.4" |
| September | 57°F | 83°F | 68°F | 6.5" |
| October | 47°F | 70°F | 57°F | 5.4" |
| November | 31°F | 54°F | 42°F | 6.2" |
| December | 32°F | 50°F | 40°F | 8.2" |
| Index | Summersville | Kentucky | National |
| Air quality index | 39 | 45 | 42 |
| Pollution index | 568,789 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 318 |
| Days with moderate air quality | 45 |
| 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 | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Greensburg, KY | 2,226 | 39 | 22.0% |
| Magnolia, KY | 695 | 39 | 22.0% |
| Buffalo, KY | 486 | 39 | 22.0% |
| Hardyville, KY | 180 | 39 | 22.0% |
| Campbellsville, KY | 11,370 | 39 | 22.0% |
| Summersville, KY | 780 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Eads, CO | 780 | 20 | 60.0% |
| Hebron, ND | 780 | 33 | 34.0% |
| Happy Valley, NM | 780 | 47 | 6.0% |
| Ventura, NM | 780 | 12 | 76.0% |
| Gray Court, SC | 780 | 46 | 8.0% |
| Summersville, KY | 780 | 39 | 22.0% |
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