| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 36°F | 27°F | 2.6" |
| February | 20°F | 39°F | 29°F | 2.0" |
| March | 32°F | 53°F | 42°F | 2.7" |
| April | 42°F | 66°F | 53°F | 4.3" |
| May | 51°F | 75°F | 63°F | 4.4" |
| June | 61°F | 84°F | 72°F | 5.8" |
| July | 64°F | 85°F | 74°F | 4.8" |
| August | 62°F | 85°F | 73°F | 3.6" |
| September | 55°F | 79°F | 66°F | 3.2" |
| October | 44°F | 67°F | 55°F | 3.3" |
| November | 33°F | 53°F | 43°F | 3.1" |
| December | 24°F | 40°F | 31°F | 3.1" |
| Index | Boswell | Indiana | National |
| Air quality index | 42 | 56 | 42 |
| Pollution index | 2,020,430 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 276 |
| Days with moderate air quality | 89 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Oxford, IN | 1,353 | 42 | 16.0% |
| Otterbein, IN | 1,023 | 42 | 16.0% |
| Alvan, IL | 308 | 42 | 16.0% |
| Pine Village, IN | 254 | 42 | 16.0% |
| Earl Park, IN | 353 | 42 | 16.0% |
| Boswell, IN | 758 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Hartford, AR | 758 | 36 | 28.0% |
| Milner, GA | 758 | 38 | 24.0% |
| Plains, GA | 758 | 39 | 22.0% |
| Arco, ID | 758 | 27 | 46.0% |
| Hamlet, IN | 758 | 42 | 16.0% |
| Boswell, IN | 758 | 42 | 16.0% |
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