Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 18°F | 34°F | 26°F | 4.5" |
February | 19°F | 35°F | 27°F | 3.6" |
March | 31°F | 49°F | 39°F | 4.4" |
April | 40°F | 62°F | 50°F | 5.4" |
May | 50°F | 72°F | 60°F | 6.5" |
June | 60°F | 81°F | 70°F | 5.8" |
July | 64°F | 84°F | 74°F | 8.0" |
August | 63°F | 82°F | 72°F | 7.5" |
September | 56°F | 76°F | 65°F | 5.4" |
October | 45°F | 64°F | 54°F | 6.2" |
November | 33°F | 51°F | 42°F | 5.4" |
December | 24°F | 38°F | 31°F | 3.8" |
Index | Riverdale | Illinois | National |
Air quality index | 55 | 41 | 42 |
Pollution index | 1,558,070 | 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 | 0.010% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.070% |
Lead | 0.090% |
Mercury | 0.010% |
City | Population | Air Quality Index | National Avg. |
South Holland, IL | 21,451 | 55 | 10.0% |
Burnham, IL | 4,121 | 55 | 10.0% |
Gary, IN | 75,486 | 55 | 10.0% |
Highland CDP, IN | 4,256 | 55 | 10.0% |
Chicago Ridge, IL | 14,028 | 55 | 10.0% |
Riverdale, IL | 12,530 | 55 | 10.0% |
City | Population | Air Quality Index | National Avg. |
Borger, TX | 12,534 | 44 | 12.0% |
St. Andrews, MB | 12,535 | n/a | |
Conneaut, OH | 12,524 | 34 | 32.0% |
Kincardine, ON | 12,522 | n/a | |
Middleburg, FL | 12,544 | 43 | 14.0% |
Riverdale, IL | 12,530 | 55 | 10.0% |