| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 35°F | 27°F | 2.3" |
| February | 20°F | 37°F | 28°F | 2.0" |
| March | 30°F | 50°F | 39°F | 2.5" |
| April | 40°F | 64°F | 51°F | 3.7" |
| May | 51°F | 74°F | 62°F | 3.7" |
| June | 61°F | 83°F | 71°F | 4.6" |
| July | 63°F | 85°F | 74°F | 4.0" |
| August | 61°F | 84°F | 72°F | 3.5" |
| September | 55°F | 78°F | 66°F | 2.9" |
| October | 44°F | 66°F | 54°F | 2.6" |
| November | 33°F | 53°F | 43°F | 2.5" |
| December | 25°F | 40°F | 32°F | 2.7" |
| Index | Bluffton | Ohio | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 2,019,850 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Gilboa, OH | 216 | 39 | 22.0% |
| Columbus Grove, OH | 1,743 | 39 | 22.0% |
| Rawson, OH | 707 | 39 | 22.0% |
| Fort Shawnee, OH | 5,835 | 39 | 22.0% |
| Lima, OH | 36,908 | 39 | 22.0% |
| Bluffton, OH | 4,024 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Westborough, MA | 4,024 | 40 | 20.0% |
| Caro, MI | 4,024 | 26 | 48.0% |
| Ellenville, NY | 4,024 | 36 | 28.0% |
| Saint-Ambroise-de-Kildare, QC | 4,024 | n/a | |
| Meridian, PA | 4,023 | 31 | 38.0% |
| Bluffton, OH | 4,024 | 39 | 22.0% |
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