| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 44°F | 34°F | 4.3" |
| February | 27°F | 46°F | 35°F | 2.7" |
| March | 35°F | 58°F | 45°F | 4.2" |
| April | 43°F | 68°F | 55°F | 5.1" |
| May | 52°F | 74°F | 62°F | 4.8" |
| June | 59°F | 82°F | 70°F | 4.6" |
| July | 62°F | 83°F | 72°F | 7.0" |
| August | 62°F | 82°F | 71°F | 6.0" |
| September | 55°F | 77°F | 65°F | 5.5" |
| October | 44°F | 67°F | 54°F | 5.6" |
| November | 34°F | 57°F | 44°F | 3.8" |
| December | 30°F | 49°F | 38°F | 3.6" |
| Index | Phelps | Kentucky | National |
| Air quality index | 295 | 45 | 42 |
| Pollution index | 780,751 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 120 |
| Days with good air quality | 106 |
| Days with moderate air quality | 14 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| South Williamson, KY | 516 | 42 | 16.0% |
| Belfry, KY | 261 | 42 | 16.0% |
| Chattaroy, WV | 585 | 42 | 16.0% |
| Delbarton, WV | 522 | 42 | 16.0% |
| Williamson, WV | 2,735 | 42 | 16.0% |
| Phelps, KY | 448 | 295 | 490.0% |
| City | Population | Air Quality Index | National Avg. |
| Grubbs, AR | 448 | 45 | 10.0% |
| Prattsville, AR | 448 | 45 | 10.0% |
| Andrew, IA | 448 | 42 | 16.0% |
| Badger, IA | 448 | 37 | 26.0% |
| Marquette, IA | 448 | 29 | 42.0% |
| Phelps, KY | 448 | 295 | 490.0% |
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