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 | 50 |
Pollution index | 4,766,000 | 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 | 0.060% |
Benzene | 0.050% |
Carbon Tetrachloride | 0.000% |
Lead | 0.020% |
Mercury | 0.090% |
City, State | Population | Air Quality Index | National Avg. |
Woodridge, IL | 33,331 | 55 | 10% |
Willow Springs, IL | 5,677 | 55 | 10% |
Hodgkins, IL | 1,960 | 55 | 10% |
Maywood, IL | 24,029 | 55 | 10% |
Glendale Heights, IL | 34,395 | 55 | 10% |
River Forest, IL | 11,217 | 55 | 10% |
City, State | Population | Air Quality Index | National Avg. |
Jefferson Hills, PA | 11,214 | 56 | 12% |
Scottdale, GA | 11,221 | 52 | 4% |
Maltby, WA | 11,221 | 45 | 10% |
Port St. John, FL | 11,223 | 39 | 22% |
Destrehan, LA | 11,211 | 45 | 10% |
River Forest, IL | 11,217 | 55 | 10% |