| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 46°F | 34°F | 3.6" |
| February | 26°F | 48°F | 36°F | 3.1" |
| March | 35°F | 60°F | 46°F | 4.3" |
| April | 45°F | 72°F | 58°F | 4.6" |
| May | 52°F | 78°F | 65°F | 4.9" |
| June | 61°F | 86°F | 73°F | 4.6" |
| July | 65°F | 87°F | 75°F | 6.8" |
| August | 63°F | 87°F | 74°F | 3.6" |
| September | 57°F | 82°F | 68°F | 3.5" |
| October | 45°F | 70°F | 57°F | 3.7" |
| November | 35°F | 60°F | 46°F | 3.0" |
| December | 29°F | 49°F | 38°F | 4.4" |
| Index | Ashland | Kentucky | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 2,383,860 | 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 | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.120% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Hanging Rock, OH | 168 | 14 | 72.0% |
| Worthington, KY | 1,639 | 14 | 72.0% |
| Wurtland, KY | 1,452 | 14 | 72.0% |
| Greenup, KY | 1,233 | 14 | 72.0% |
| Franklin Furnace, OH | 1,795 | 14 | 72.0% |
| Ashland, KY | 20,449 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Suwanee, GA | 20,444 | 37 | 26.0% |
| Lockport, NY | 20,420 | 39 | 22.0% |
| Grayslake, IL | 20,482 | 39 | 22.0% |
| South Frontenac, ON | 20,491 | n/a | |
| Northfield, MN | 20,399 | 37 | 26.0% |
| Ashland, KY | 20,449 | 42 | 16.0% |
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