| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 41°F | 33°F | 7.5" |
| February | 18°F | 37°F | 27°F | 3.4" |
| March | 32°F | 53°F | 41°F | 6.9" |
| April | 39°F | 65°F | 51°F | 5.4" |
| May | 47°F | 76°F | 61°F | 3.1" |
| June | 59°F | 85°F | 72°F | 5.0" |
| July | 61°F | 85°F | 73°F | 5.3" |
| August | 63°F | 88°F | 74°F | 6.5" |
| September | 52°F | 83°F | 66°F | 4.5" |
| October | 46°F | 69°F | 56°F | 3.0" |
| November | 33°F | 55°F | 44°F | 6.9" |
| December | 24°F | 40°F | 32°F | 4.3" |
| Index | Lancaster | Ohio | National |
| Air quality index | 46 | 40 | 42 |
| Pollution index | 2,306,000 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 237 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.710% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.020% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Logan, OH | 6,677 | 25 | 50.0% |
| Rockbridge, OH | 47 | 25 | 50.0% |
| Hide-A-Way Hills, OH | 833 | 25 | 50.0% |
| Bremen, OH | 1,477 | 25 | 50.0% |
| Sugar Grove, OH | 363 | 25 | 50.0% |
| Lancaster, OH | 40,438 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Westerville, OH | 40,443 | 46 | 8.0% |
| Huber Heights, OH | 40,465 | 47 | 6.0% |
| Covington, KY | 40,466 | 54 | 8.0% |
| Wentzville, MO | 40,407 | 54 | 8.0% |
| New Tecumseth, ON | 40,488 | n/a | |
| Lancaster, OH | 40,438 | 46 | 8.0% |
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