| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 35°F | 27°F | 2.0" |
| February | 19°F | 36°F | 27°F | 1.9" |
| March | 30°F | 50°F | 39°F | 2.7" |
| April | 39°F | 63°F | 51°F | 3.8" |
| May | 50°F | 74°F | 62°F | 3.9" |
| June | 59°F | 83°F | 71°F | 4.0" |
| July | 62°F | 85°F | 74°F | 3.3" |
| August | 60°F | 84°F | 72°F | 3.6" |
| September | 54°F | 78°F | 65°F | 3.2" |
| October | 44°F | 65°F | 53°F | 2.6" |
| November | 33°F | 52°F | 42°F | 2.8" |
| December | 25°F | 39°F | 32°F | 2.4" |
| Index | Butler | Indiana | National |
| Air quality index | 45 | 56 | 42 |
| Pollution index | 3,274,520 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 128 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Montpelier, OH | 3,944 | 39 | 22.0% |
| Hamilton, IN | 1,702 | 45 | 10.0% |
| Leo-Cedarville, IN | 3,814 | 45 | 10.0% |
| Blakeslee, OH | 94 | 45 | 10.0% |
| Auburn, IN | 13,209 | 45 | 10.0% |
| Butler, IN | 2,889 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Colonial Heights, TN | 2,889 | 45 | 10.0% |
| Peguis 1B, MB | 2,889 | n/a | |
| Acres Green, CO | 2,888 | 58 | 16.0% |
| Fowlerville, MI | 2,888 | 36 | 28.0% |
| Gladwin, MI | 2,888 | 26 | 48.0% |
| Butler, IN | 2,889 | 45 | 10.0% |
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