| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 39°F | 29°F | 3.5" |
| February | 21°F | 42°F | 31°F | 2.6" |
| March | 32°F | 55°F | 43°F | 4.0" |
| April | 42°F | 68°F | 55°F | 5.3" |
| May | 52°F | 76°F | 64°F | 4.8" |
| June | 62°F | 85°F | 73°F | 5.7" |
| July | 65°F | 87°F | 76°F | 4.9" |
| August | 65°F | 87°F | 75°F | 3.3" |
| September | 57°F | 81°F | 68°F | 3.4" |
| October | 45°F | 68°F | 56°F | 3.2" |
| November | 33°F | 55°F | 44°F | 3.3" |
| December | 25°F | 42°F | 33°F | 4.1" |
| Index | Bethany | Indiana | National |
| Air quality index | 54 | 56 | 42 |
| Pollution index | 2,395,300 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 148 |
| Days with moderate air quality | 212 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Trafalgar, IN | 1,237 | 41 | 18.0% |
| Princes Lakes, IN | 1,424 | 41 | 18.0% |
| Painted Hills, IN | 743 | 42 | 16.0% |
| Paragon, IN | 693 | 42 | 16.0% |
| Martinsville, IN | 11,714 | 42 | 16.0% |
| Bethany, IN | 98 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Northway Village, AK | 98 | 38 | 24.0% |
| Oakhaven, AR | 98 | 39 | 22.0% |
| Peach Orchard, AR | 98 | 26 | 48.0% |
| Seven Hills, CO | 98 | 47 | 6.0% |
| Geneva, GA | 98 | 42 | 16.0% |
| Bethany, IN | 98 | 54 | 8.0% |
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