| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 34°F | 26°F | 4.3" |
| February | 19°F | 36°F | 27°F | 4.1" |
| March | 32°F | 51°F | 41°F | 5.8" |
| April | 41°F | 65°F | 52°F | 7.7" |
| May | 52°F | 74°F | 63°F | 7.7" |
| June | 61°F | 82°F | 72°F | 10.1" |
| July | 64°F | 84°F | 74°F | 6.8" |
| August | 62°F | 83°F | 72°F | 10.2" |
| September | 55°F | 77°F | 66°F | 6.2" |
| October | 44°F | 66°F | 54°F | 5.8" |
| November | 33°F | 52°F | 42°F | 6.4" |
| December | 24°F | 39°F | 31°F | 4.7" |
| Index | Onward | Indiana | National |
| Air quality index | 37 | 56 | 42 |
| Pollution index | 2,150,900 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 351 |
| Days with good air quality | 319 |
| Days with moderate air quality | 32 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.650% |
| Mercury | 1.040% |
| City | Population | Air Quality Index | National Avg. |
| Mexico, IN | 1,283 | 37 | 26.0% |
| Denver, IN | 597 | 37 | 26.0% |
| Galveston, IN | 1,349 | 37 | 26.0% |
| Peru, IN | 11,369 | 37 | 26.0% |
| Amboy, IN | 363 | 37 | 26.0% |
| Onward, IN | 171 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Silver Springs, AK | 171 | 31 | 38.0% |
| Banks, AL | 171 | 52 | 4.0% |
| Paint Rock, AL | 171 | 44 | 12.0% |
| Caulksville, AR | 171 | 36 | 28.0% |
| Concord, AR | 171 | 45 | 10.0% |
| Onward, IN | 171 | 37 | 26.0% |
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