| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 47°F | 36°F | 4.0" |
| February | 28°F | 49°F | 38°F | 3.2" |
| March | 37°F | 60°F | 48°F | 4.5" |
| April | 46°F | 72°F | 58°F | 5.5" |
| May | 53°F | 77°F | 65°F | 4.8" |
| June | 62°F | 85°F | 73°F | 4.2" |
| July | 66°F | 86°F | 75°F | 5.9" |
| August | 65°F | 87°F | 75°F | 4.6" |
| September | 58°F | 81°F | 68°F | 3.5" |
| October | 46°F | 70°F | 57°F | 3.6" |
| November | 35°F | 60°F | 47°F | 3.4" |
| December | 31°F | 50°F | 40°F | 5.0" |
| Index | Barbourville | Kentucky | National |
| Air quality index | 39 | 45 | 42 |
| Pollution index | 5,798,370 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 263 |
| Days with good air quality | 243 |
| Days with moderate air quality | 20 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.070% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.030% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Rockholds, KY | 204 | 39 | 22.0% |
| Arjay, KY | 265 | 39 | 22.0% |
| Emlyn, KY | 590 | 39 | 22.0% |
| Flat Lick, KY | 920 | 39 | 22.0% |
| Pineville, KY | 1,902 | 39 | 22.0% |
| Barbourville, KY | 3,051 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Momence, IL | 3,051 | 55 | 10.0% |
| Overton, TX | 3,051 | 36 | 28.0% |
| White Sulphur Springs, WV | 3,051 | 41 | 18.0% |
| Welcome, NC | 3,050 | 40 | 20.0% |
| New Maryland, NB | 3,050 | n/a | |
| Barbourville, KY | 3,051 | 39 | 22.0% |
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