| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 41°F | 32°F | 3.3" |
| February | 27°F | 43°F | 34°F | 2.1" |
| March | 38°F | 57°F | 46°F | 4.7" |
| April | 48°F | 70°F | 58°F | 9.5" |
| May | 58°F | 78°F | 67°F | 4.8" |
| June | 66°F | 86°F | 75°F | 2.2" |
| July | 67°F | 87°F | 76°F | 8.0" |
| August | 65°F | 86°F | 75°F | 1.7" |
| September | 57°F | 81°F | 68°F | 5.4" |
| October | 47°F | 70°F | 57°F | 1.8" |
| November | 37°F | 56°F | 45°F | 6.7" |
| December | 30°F | 44°F | 36°F | 2.5" |
| Index | Princeton | Indiana | National |
| Air quality index | 36 | 56 | 42 |
| Pollution index | 317,387 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 328 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Oakland City, IN | 2,570 | 6 | 88.0% |
| Mount Carmel, IL | 6,922 | 36 | 28.0% |
| Francisco, IN | 541 | 36 | 28.0% |
| Allendale, IL | 655 | 36 | 28.0% |
| Decker, IN | 256 | 36 | 28.0% |
| Princeton, IN | 8,716 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Rawlins, WY | 8,716 | 42 | 16.0% |
| Andalusia, AL | 8,719 | 31 | 38.0% |
| Clanton, AL | 8,719 | 52 | 4.0% |
| Fort Riley, KS | 8,720 | 32 | 36.0% |
| Park Ridge, NJ | 8,721 | 51 | 2.0% |
| Princeton, IN | 8,716 | 36 | 28.0% |
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