| 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 | Salem | 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. |
| Hardinsburg, IN | 141 | 6 | 88.0% |
| Saltillo, IN | 160 | 35 | 30.0% |
| Crothersville, IN | 1,771 | 35 | 30.0% |
| Livonia, IN | 76 | 35 | 30.0% |
| Little York, IN | 267 | 35 | 30.0% |
| Salem, IN | 6,193 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| St. Robert, MO | 6,193 | 39 | 22.0% |
| Rushville, IN | 6,194 | 28 | 44.0% |
| South Monroe, MI | 6,194 | 1 | 98.0% |
| Jan Phyl Village, FL | 6,195 | 36 | 28.0% |
| Port Clinton, OH | 6,190 | 40 | 20.0% |
| Salem, IN | 6,193 | 35 | 30.0% |
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