| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 46°F | 35°F | 5.6" |
| February | 26°F | 50°F | 38°F | 4.7" |
| March | 36°F | 62°F | 49°F | 6.8" |
| April | 44°F | 72°F | 58°F | 8.0" |
| May | 54°F | 78°F | 66°F | 8.3" |
| June | 61°F | 86°F | 73°F | 5.2" |
| July | 64°F | 88°F | 75°F | 8.5" |
| August | 63°F | 87°F | 74°F | 6.8" |
| September | 57°F | 81°F | 68°F | 8.6" |
| October | 44°F | 72°F | 57°F | 5.2" |
| November | 33°F | 60°F | 46°F | 5.8" |
| December | 29°F | 50°F | 39°F | 6.8" |
| Index | Somerset | Kentucky | National |
| Air quality index | 40 | 45 | 42 |
| Pollution index | 445,912 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 282 |
| Days with good air quality | 267 |
| Days with moderate air quality | 15 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Science Hill, KY | 814 | 40 | 20.0% |
| Burnside, KY | 979 | 40 | 20.0% |
| Eubank, KY | 362 | 40 | 20.0% |
| Ferguson, KY | 868 | 40 | 20.0% |
| Somerset, KY | 11,548 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Valley Falls, RI | 11,548 | 44 | 12.0% |
| Muscoy, CA | 11,546 | 89 | 78.0% |
| Elk City, OK | 11,544 | 43 | 14.0% |
| Wallington, NJ | 11,553 | 51 | 2.0% |
| Mountain Top, PA | 11,553 | 38 | 24.0% |
| Somerset, KY | 11,548 | 40 | 20.0% |
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