| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 33°F | 25°F | 1.1" |
| February | 19°F | 34°F | 26°F | 1.4" |
| March | 30°F | 48°F | 38°F | 1.8" |
| April | 39°F | 60°F | 49°F | 2.7" |
| May | 49°F | 71°F | 60°F | 3.6" |
| June | 60°F | 81°F | 69°F | 4.7" |
| July | 65°F | 85°F | 74°F | 4.0" |
| August | 64°F | 83°F | 73°F | 4.4" |
| September | 56°F | 76°F | 66°F | 2.7" |
| October | 45°F | 64°F | 54°F | 3.2" |
| November | 34°F | 50°F | 42°F | 1.7" |
| December | 23°F | 37°F | 30°F | 2.0" |
| Index | Mundelein | Illinois | National |
| Air quality index | 39 | 41 | 42 |
| Pollution index | 543,516 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 203 |
| Days with good air quality | 174 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lindenhurst, IL | 14,317 | 39 | 22.0% |
| Third Lake, IL | 1,160 | 39 | 22.0% |
| Johnsburg, IL | 6,354 | 39 | 22.0% |
| Pistakee Highlands, IL | 3,302 | 39 | 22.0% |
| Fox Lake Hills, IL | 2,125 | 39 | 22.0% |
| Mundelein, IL | 31,574 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| North Olmsted, OH | 31,562 | 50 | = 100 |
| West Bend, WI | 31,587 | 44 | 12.0% |
| Franklin Square, NY | 31,537 | 51 | 2.0% |
| Laguna Hills, CA | 31,613 | 89 | 78.0% |
| Midlothian, TX | 31,533 | 51 | 2.0% |
| Mundelein, IL | 31,574 | 39 | 22.0% |
Here are the best places to live in Illinois
Most Dangerous Cities In The US
Check out the 10 most dangerous cities in Illinois
These are the largest cities in Illinois