Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 24°F | 43°F | 32°F | 1.8" |
February | 26°F | 45°F | 34°F | 1.6" |
March | 37°F | 59°F | 47°F | 3.7" |
April | 47°F | 70°F | 58°F | 5.3" |
May | 56°F | 78°F | 67°F | 4.8" |
June | 65°F | 88°F | 76°F | 4.4" |
July | 68°F | 90°F | 79°F | 3.9" |
August | 66°F | 89°F | 77°F | 3.1" |
September | 58°F | 82°F | 69°F | 4.2" |
October | 47°F | 71°F | 58°F | 3.1" |
November | 36°F | 58°F | 46°F | 2.8" |
December | 29°F | 45°F | 36°F | 3.1" |
Index | Arnold | Missouri | National |
Air quality index | 54 | 97 | 42 |
Pollution index | 8,473,050 | 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 | 0.020% |
Benzene | 0.070% |
Carbon Tetrachloride | 0.020% |
Lead | 0.010% |
Mercury | 0.010% |
City | Population | Air Quality Index | National Avg. |
Washington Park, IL | 3,909 | 54 | 8.0% |
Fenton, MO | 4,033 | 54 | 8.0% |
Lakeshire, MO | 1,435 | 54 | 8.0% |
Richmond Heights, MO | 8,581 | 54 | 8.0% |
Westwood, MO | 314 | 54 | 8.0% |
Arnold, MO | 21,144 | 54 | 8.0% |
City | Population | Air Quality Index | National Avg. |
Saint-Augustin-de-Desmaures, QC | 21,143 | n/a | |
Easley, SC | 21,149 | 46 | 8.0% |
Ashland, OR | 21,138 | 36 | 28.0% |
Covington, WA | 21,131 | 45 | 10.0% |
Piqua, OH | 21,159 | 47 | 6.0% |
Arnold, MO | 21,144 | 54 | 8.0% |