| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 45°F | 34°F | 4.2" |
| February | 29°F | 50°F | 38°F | 4.0" |
| March | 38°F | 60°F | 48°F | 4.9" |
| April | 48°F | 73°F | 59°F | 5.8" |
| May | 55°F | 78°F | 65°F | 5.2" |
| June | 63°F | 84°F | 72°F | 5.1" |
| July | 66°F | 85°F | 75°F | 6.8" |
| August | 65°F | 84°F | 73°F | 5.6" |
| September | 59°F | 79°F | 68°F | 3.2" |
| October | 48°F | 70°F | 58°F | 3.7" |
| November | 38°F | 60°F | 48°F | 2.9" |
| December | 32°F | 50°F | 40°F | 5.2" |
| Index | West Liberty | Kentucky | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 2,559,040 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 299 |
| Days with moderate air quality | 66 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.390% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hazel Green, KY | 81 | 33 | 34.0% |
| Maytown, KY | 113 | 33 | 34.0% |
| Campton, KY | 316 | 33 | 34.0% |
| Ezel, KY | 226 | 33 | 34.0% |
| Salyersville, KY | 1,964 | 42 | 16.0% |
| West Liberty, KY | 3,414 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Day Valley, CA | 3,414 | 35 | 30.0% |
| Johnston City, IL | 3,414 | 43 | 14.0% |
| Hanover, MN | 3,414 | 46 | 8.0% |
| New Hampton, IA | 3,413 | 39 | 22.0% |
| Maiden, NC | 3,413 | 36 | 28.0% |
| West Liberty, KY | 3,414 | 42 | 16.0% |
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