| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 26°F | 2.9" |
| February | 20°F | 38°F | 28°F | 2.9" |
| March | 29°F | 50°F | 38°F | 3.4" |
| April | 39°F | 63°F | 50°F | 4.7" |
| May | 50°F | 74°F | 62°F | 4.8" |
| June | 58°F | 81°F | 69°F | 5.2" |
| July | 62°F | 84°F | 73°F | 3.8" |
| August | 60°F | 82°F | 71°F | 3.0" |
| September | 54°F | 77°F | 65°F | 3.3" |
| October | 44°F | 65°F | 54°F | 3.6" |
| November | 33°F | 53°F | 42°F | 3.4" |
| December | 25°F | 40°F | 32°F | 3.3" |
| Index | Lexington | Ohio | National |
| Air quality index | 41 | 40 | 42 |
| Pollution index | 1,197,810 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 218 |
| Days with moderate air quality | 27 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| North Robinson, OH | 411 | 41 | 18.0% |
| Butler, OH | 858 | 41 | 18.0% |
| Candlewood Lake, OH | 783 | 41 | 18.0% |
| Mount Gilead, OH | 3,439 | 41 | 18.0% |
| Ontario, OH | 6,094 | 41 | 18.0% |
| Lexington, OH | 4,937 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Platte City, MO | 4,938 | 47 | 6.0% |
| Clementon, NJ | 4,939 | 51 | 2.0% |
| Bridgeville, PA | 4,939 | 56 | 12.0% |
| Vancleave, MS | 4,934 | 32 | 36.0% |
| Coal City, IL | 4,941 | 0 | 100.0% |
| Lexington, OH | 4,937 | 41 | 18.0% |
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