Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 24°F | 45°F | 33°F | 2.4" |
February | 25°F | 48°F | 35°F | 2.2" |
March | 37°F | 61°F | 48°F | 3.6" |
April | 47°F | 72°F | 59°F | 5.4" |
May | 57°F | 80°F | 68°F | 4.6" |
June | 67°F | 89°F | 78°F | 5.2" |
July | 70°F | 92°F | 81°F | 4.2" |
August | 69°F | 91°F | 79°F | 3.6" |
September | 61°F | 84°F | 72°F | 4.3" |
October | 48°F | 72°F | 60°F | 3.4" |
November | 37°F | 60°F | 48°F | 3.4" |
December | 27°F | 47°F | 37°F | 3.5" |
Index | St. Charles | Missouri | National |
Air quality index | 54 | 97 | 42 |
Pollution index | 8,870,230 | 1,630,255 | 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 | 0.180% |
Benzene | 0.060% |
Carbon Tetrachloride | 0.020% |
Lead | 0.030% |
Mercury | 0.120% |
City | Population | Air Quality Index | National Avg. |
Elsah, IL | 701 | 54 | 8.0% |
Florissant, MO | 51,220 | 54 | 8.0% |
Old Jamestown, MO | 19,602 | 54 | 8.0% |
Country Life Acres, MO | 52 | 54 | 8.0% |
Richmond Heights, MO | 8,581 | 54 | 8.0% |
St. Charles, MO | 70,650 | 54 | 8.0% |
City | Population | Air Quality Index | National Avg. |
Wilmington, DE | 70,655 | 51 | 2.0% |
North Richland Hills, TX | 70,585 | 51 | 2.0% |
Saint John, NB | 70,776 | n/a | |
Casas Adobes, AZ | 70,516 | 47 | 6.0% |
Canton, OH | 70,863 | 46 | 8.0% |
St. Charles, MO | 70,650 | 54 | 8.0% |