| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 35°F | 27°F | 3.7" |
| February | 20°F | 37°F | 28°F | 2.9" |
| March | 33°F | 52°F | 41°F | 4.7" |
| April | 42°F | 66°F | 53°F | 5.6" |
| May | 54°F | 76°F | 64°F | 6.5" |
| June | 63°F | 84°F | 73°F | 7.6" |
| July | 65°F | 85°F | 75°F | 10.4" |
| August | 62°F | 83°F | 72°F | 7.8" |
| September | 55°F | 79°F | 66°F | 7.6" |
| October | 44°F | 66°F | 54°F | 4.3" |
| November | 34°F | 53°F | 42°F | 5.5" |
| December | 24°F | 39°F | 31°F | 3.5" |
| Index | Campus | Illinois | National |
| Air quality index | 1 | 41 | 50 |
| Pollution index | 1,736,930 | 3,347,295 | 5,066,862 |
| Measurement | Total |
| Days measured | 351 |
| Days with good air quality | 351 |
| Days with moderate air quality | |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.001% |
| City, State | Population | Air Quality Index | National Avg. |
| Braceville, IL | 735 | 1 | 98% |
| Dwight, IL | 4,168 | 1 | 98% |
| Gardner, IL | 1,242 | 1 | 98% |
| Kinsman, IL | 85 | 1 | 98% |
| Saunemin, IL | 331 | 1 | 98% |
| Campus, IL | 129 | 1 | 98% |
| City, State | Population | Air Quality Index | National Avg. |
| Garber, IA | 129 | 32 | 36% |
| Keystone, WV | 129 | 295 | 490% |
| Pony, MT | 129 | 24 | 52% |
| Hallett, OK | 129 | 48 | 4% |
| Bear Grass, NC | 129 | 3 | 94% |
| Campus, IL | 129 | 1 | 98% |