| 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 | Delphi | Indiana | National |
| Air quality index | 42 | 56 | 42 |
| Pollution index | 680,492 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brookston, IN | 1,398 | 42 | 16.0% |
| Chalmers, IN | 460 | 42 | 16.0% |
| Lafayette, IN | 72,556 | 42 | 16.0% |
| Reynolds, IN | 506 | 42 | 16.0% |
| West Lafayette, IN | 49,668 | 42 | 16.0% |
| Delphi, IN | 2,979 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Chevy Chase, MD | 2,979 | 47 | 6.0% |
| Lead, SD | 2,979 | 44 | 12.0% |
| Stanton, TX | 2,978 | 28 | 44.0% |
| Bal Harbour, FL | 2,980 | 41 | 18.0% |
| East Prairie, MO | 2,980 | 44 | 12.0% |
| Delphi, IN | 2,979 | 42 | 16.0% |
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