Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 20°F | 34°F | 26°F | 1.9" |
February | 21°F | 36°F | 28°F | 1.6" |
March | 33°F | 49°F | 40°F | 2.4" |
April | 42°F | 62°F | 51°F | 3.6" |
May | 52°F | 73°F | 61°F | 4.3" |
June | 63°F | 82°F | 72°F | 4.6" |
July | 68°F | 86°F | 76°F | 3.5" |
August | 67°F | 83°F | 75°F | 5.1" |
September | 60°F | 77°F | 68°F | 2.8" |
October | 48°F | 65°F | 55°F | 3.9" |
November | 36°F | 51°F | 43°F | 2.2" |
December | 25°F | 37°F | 31°F | 2.2" |
Index | Brookfield | Illinois | National |
Air quality index | 55 | 41 | 50 |
Pollution index | 14,981,300 | 3,347,295 | 5,066,862 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 121 |
Days with moderate air quality | 227 |
Days w/ poor A.Q. for sensitive groups | 16 |
Days with unhealthy air quality | 1 |
Pollutant | Total |
Arsenic | 0.010% |
Benzene | 0.140% |
Carbon Tetrachloride | 0.030% |
Lead | 0.020% |
Mercury | 0.010% |
City, State | Population | Air Quality Index | National Avg. |
Chicago Ridge, IL | 14,368 | 55 | 10% |
Addison, IL | 37,192 | 55 | 10% |
Niles, IL | 29,628 | 55 | 10% |
Merrionette Park, IL | 1,896 | 55 | 10% |
Burr Ridge, IL | 10,736 | 55 | 10% |
Brookfield, IL | 18,966 | 55 | 10% |
City, State | Population | Air Quality Index | National Avg. |
Sherwood, OR | 18,965 | 38 | 24% |
Ellensburg, WA | 18,957 | 23 | 54% |
Hawthorne, NJ | 18,950 | 51 | 2% |
Ansonia, CT | 18,950 | 41 | 18% |
Howard, WI | 18,950 | 36 | 28% |
Brookfield, IL | 18,966 | 55 | 10% |