| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 37°F | 29°F | 11.1" |
| February | 17°F | 32°F | 25°F | 2.6" |
| March | 31°F | 50°F | 39°F | 6.7" |
| April | 39°F | 62°F | 50°F | 7.1" |
| May | 48°F | 74°F | 61°F | 1.6" |
| June | 61°F | 85°F | 73°F | 5.4" |
| July | 61°F | 84°F | 73°F | 5.5" |
| August | 63°F | 86°F | 74°F | 10.2" |
| September | 56°F | 79°F | 67°F | 5.9" |
| October | 47°F | 67°F | 57°F | 3.2" |
| November | 33°F | 52°F | 43°F | 5.1" |
| December | 22°F | 36°F | 29°F | 3.3" |
| Index | Mendon | Ohio | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 4,401,700 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 303 |
| Days with moderate air quality | 61 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Celina, OH | 10,498 | 39 | 22.0% |
| St. Marys, OH | 8,227 | 39 | 22.0% |
| Spencerville, OH | 2,204 | 39 | 22.0% |
| Coldwater, OH | 3,976 | 39 | 22.0% |
| Buckland, OH | 285 | 39 | 22.0% |
| Mendon, OH | 643 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Santa Rosa, AZ | 643 | 47 | 6.0% |
| Acacia Villas, FL | 643 | 41 | 18.0% |
| Tower Hill, IL | 643 | 40 | 20.0% |
| Park City, KY | 643 | 43 | 14.0% |
| Newcastle, ME | 643 | 36 | 28.0% |
| Mendon, OH | 643 | 39 | 22.0% |
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