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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 32°F | 24°F | 1.4" |
| February | 17°F | 34°F | 25°F | 1.2" |
| March | 30°F | 49°F | 38°F | 2.2" |
| April | 39°F | 62°F | 50°F | 3.8" |
| May | 49°F | 73°F | 60°F | 4.5" |
| June | 59°F | 82°F | 70°F | 4.4" |
| July | 63°F | 85°F | 74°F | 4.1" |
| August | 62°F | 83°F | 72°F | 3.8" |
| September | 54°F | 77°F | 65°F | 3.4" |
| October | 43°F | 64°F | 53°F | 3.1" |
| November | 32°F | 50°F | 40°F | 1.9" |
| December | 21°F | 36°F | 29°F | 2.1" |
| Index | South Elgin | Illinois | National |
| Air quality index | 55 | 41 | 42 |
| Pollution index | 14,981,300 | 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 | 0.140% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Prestbury, IL | 1,978 | 0 | 100.0% |
| Kaneville, IL | 518 | 0 | 100.0% |
| Gilberts, IL | 7,941 | 42 | 16.0% |
| Virgil, IL | 421 | 42 | 16.0% |
| Hampshire, IL | 5,909 | 42 | 16.0% |
| South Elgin, IL | 23,648 | 55 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Muscatine, IA | 23,661 | 32 | 36.0% |
| North Haven, CT | 23,665 | 41 | 18.0% |
| L'Assomption, QC | 23,628 | n/a | |
| Stoneham, MA | 23,625 | 43 | 14.0% |
| Searcy, AR | 23,673 | 45 | 10.0% |
| South Elgin, IL | 23,648 | 55 | 10.0% |