| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 37°F | 28°F | 2.6" |
| February | 21°F | 39°F | 29°F | 3.2" |
| March | 34°F | 55°F | 43°F | 4.1" |
| April | 44°F | 67°F | 55°F | 6.7" |
| May | 54°F | 76°F | 65°F | 4.6" |
| June | 63°F | 85°F | 74°F | 8.5" |
| July | 66°F | 87°F | 76°F | 11.2" |
| August | 64°F | 86°F | 74°F | 8.1" |
| September | 56°F | 80°F | 67°F | 11.5" |
| October | 46°F | 68°F | 56°F | 6.3" |
| November | 34°F | 54°F | 43°F | 5.1" |
| December | 25°F | 40°F | 32°F | 5.3" |
| Index | Beason | Illinois | National |
| Air quality index | 44 | 41 | 42 |
| Pollution index | 1,277,890 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 255 |
| Days with moderate air quality | 110 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Lincoln, IL | 13,742 | 40 | 20.0% |
| Broadwell, IL | 188 | 40 | 20.0% |
| Elkhart, IL | 459 | 40 | 20.0% |
| Cornland, IL | 71 | 40 | 20.0% |
| Hartsburg, IL | 386 | 44 | 12.0% |
| Beason, IL | 201 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Lakeview, AL | 201 | 39 | 22.0% |
| Garner, AR | 201 | 45 | 10.0% |
| Danville, GA | 201 | 38 | 24.0% |
| Lilly, GA | 201 | 39 | 22.0% |
| Haena, HI | 201 | 13 | 74.0% |
| Beason, IL | 201 | 44 | 12.0% |
Here are the best places to live in Illinois
Most Dangerous States In The US
These are the largest cities in Illinois
These are the 10 cheapest cities in Illinois