Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 25°F | 42°F | 33°F | 4.6" |
February | 27°F | 45°F | 35°F | 2.4" |
March | 39°F | 58°F | 48°F | 3.7" |
April | 48°F | 69°F | 58°F | 6.6" |
May | 57°F | 77°F | 66°F | 10.0" |
June | 66°F | 86°F | 76°F | 8.8" |
July | 69°F | 88°F | 78°F | 6.8" |
August | 67°F | 87°F | 76°F | 10.7" |
September | 59°F | 81°F | 69°F | 7.4" |
October | 48°F | 70°F | 58°F | 9.0" |
November | 38°F | 57°F | 47°F | 6.5" |
December | 30°F | 45°F | 37°F | 7.7" |
Index | Chester | Illinois | National |
Air quality index | 54 | 41 | 42 |
Pollution index | 753,473 | 3,148,694 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 134 |
Days with moderate air quality | 221 |
Days w/ poor A.Q. for sensitive groups | 8 |
Days with unhealthy air quality | 2 |
Pollutant | Total |
Arsenic | 0.001% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.001% |
Lead | 0.020% |
Mercury | 0.020% |
City | Population | Air Quality Index | National Avg. |
Percy, IL | 1,110 | 43 | 14.0% |
Rockwood, IL | 25 | 43 | 14.0% |
Steeleville, IL | 1,870 | 43 | 14.0% |
Cutler, IL | 429 | 43 | 14.0% |
Willisville, IL | 596 | 43 | 14.0% |
Chester, IL | 8,264 | 54 | 8.0% |
City | Population | Air Quality Index | National Avg. |
Mammoth Lakes, CA | 8,263 | 47 | 6.0% |
Orting, WA | 8,267 | 30 | 40.0% |
Four Corners, MD | 8,268 | 47 | 6.0% |
Lac la Biche County, AB | 8,268 | n/a | |
Spotswood, NJ | 8,255 | 41 | 18.0% |
Chester, IL | 8,264 | 54 | 8.0% |