| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 31°F | 25°F | 3.5" |
| February | 18°F | 33°F | 25°F | 2.9" |
| March | 29°F | 47°F | 37°F | 4.2" |
| April | 39°F | 60°F | 49°F | 3.4" |
| May | 51°F | 71°F | 60°F | 8.2" |
| June | 60°F | 79°F | 69°F | 6.2" |
| July | 62°F | 82°F | 72°F | 3.9" |
| August | 61°F | 80°F | 70°F | 5.0" |
| September | 54°F | 74°F | 63°F | 2.8" |
| October | 44°F | 62°F | 52°F | 4.9" |
| November | 33°F | 49°F | 40°F | 2.8" |
| December | 24°F | 36°F | 30°F | 2.5" |
| Index | Ashley | Indiana | National |
| Air quality index | 45 | 56 | 42 |
| Pollution index | 1,872,410 | 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 | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Orland, IN | 464 | 37 | 26.0% |
| Hamilton, IN | 1,702 | 45 | 10.0% |
| St. Joe, IN | 456 | 45 | 10.0% |
| Altona, IN | 509 | 45 | 10.0% |
| Butler, IN | 2,889 | 45 | 10.0% |
| Ashley, IN | 1,051 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Mineral Springs, AR | 1,051 | 39 | 22.0% |
| Alhambra Valley, CA | 1,051 | 40 | 20.0% |
| Hydesville, CA | 1,051 | 27 | 46.0% |
| Janesville, IA | 1,051 | 39 | 22.0% |
| Argenta, IL | 1,051 | 44 | 12.0% |
| Ashley, IN | 1,051 | 45 | 10.0% |
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