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 | River Forest | Illinois | National |
Air quality index | 55 | 41 | 42 |
Pollution index | 4,766,000 | 3,148,694 | 2,726,193 |
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 | 0.060% |
Benzene | 0.050% |
Carbon Tetrachloride | 0.000% |
Lead | 0.020% |
Mercury | 0.090% |
City | Population | Air Quality Index | National Avg. |
Berwyn, IL | 54,850 | 55 | 10.0% |
Cicero, IL | 81,471 | 55 | 10.0% |
Oak Park, IL | 52,102 | 55 | 10.0% |
Hickory Hills, IL | 14,253 | 55 | 10.0% |
Evergreen Park, IL | 19,290 | 55 | 10.0% |
River Forest, IL | 10,883 | 55 | 10.0% |
City | Population | Air Quality Index | National Avg. |
Sussex, WI | 10,884 | 44 | 12.0% |
Kings Mountain, NC | 10,885 | 36 | 28.0% |
Malvern, AR | 10,886 | 38 | 24.0% |
Camden, AR | 10,877 | 35 | 30.0% |
Manchester, TN | 10,896 | 46 | 8.0% |
River Forest, IL | 10,883 | 55 | 10.0% |