| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 45°F | 35°F | 3.7" |
| February | 29°F | 47°F | 37°F | 2.9" |
| March | 39°F | 60°F | 48°F | 4.5" |
| April | 48°F | 71°F | 59°F | 6.3" |
| May | 57°F | 79°F | 68°F | 5.7" |
| June | 66°F | 87°F | 77°F | 5.3" |
| July | 69°F | 89°F | 79°F | 5.6" |
| August | 68°F | 89°F | 78°F | 3.7" |
| September | 61°F | 83°F | 71°F | 4.6" |
| October | 48°F | 71°F | 59°F | 4.4" |
| November | 38°F | 59°F | 48°F | 3.5" |
| December | 31°F | 48°F | 39°F | 4.8" |
| Index | Crothersville | Indiana | National |
| Air quality index | 35 | 56 | 42 |
| Pollution index | 751,900 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 340 |
| Days with moderate air quality | 20 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Seymour, IN | 19,780 | 35 | 30.0% |
| Vallonia, IN | 292 | 35 | 30.0% |
| Vernon, IN | 196 | 35 | 30.0% |
| Salem, IN | 6,193 | 35 | 30.0% |
| Deputy, IN | 34 | 35 | 30.0% |
| Crothersville, IN | 1,771 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Lacon, IL | 1,771 | 41 | 18.0% |
| Adwolf, VA | 1,771 | 26 | 48.0% |
| Fort Deposit, AL | 1,770 | 52 | 4.0% |
| Stamps, AR | 1,770 | 39 | 22.0% |
| Jonesboro, IL | 1,772 | 44 | 12.0% |
| Crothersville, IN | 1,771 | 35 | 30.0% |
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