Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 13°F | 33°F | 22°F | 0.4" |
February | 15°F | 37°F | 25°F | 0.7" |
March | 29°F | 54°F | 40°F | 1.4" |
April | 39°F | 66°F | 51°F | 3.5" |
May | 51°F | 77°F | 63°F | 4.0" |
June | 62°F | 86°F | 73°F | 5.1" |
July | 65°F | 89°F | 76°F | 3.0" |
August | 62°F | 85°F | 73°F | 4.9" |
September | 53°F | 79°F | 65°F | 3.9" |
October | 41°F | 67°F | 52°F | 2.4" |
November | 28°F | 52°F | 39°F | 0.9" |
December | 16°F | 36°F | 25°F | 1.2" |
Index | Charter Oak | Iowa | National |
Air quality index | 35 | 39 | 42 |
Pollution index | 565,451 | 1,154,535 | 2,726,193 |
Measurement | Total |
Days measured | 364 |
Days with good air quality | 322 |
Days with moderate air quality | 42 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.000% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.001% |
Lead | 0.000% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Denison, IA | 8,319 | 35 | 30.0% |
Schleswig, IA | 979 | 35 | 30.0% |
Ricketts, IA | 92 | 35 | 30.0% |
Kiron, IA | 321 | 35 | 30.0% |
Danbury, IA | 402 | 35 | 30.0% |
Charter Oak, IA | 570 | 35 | 30.0% |
City | Population | Air Quality Index | National Avg. |
New Stuyahok, AK | 570 | 31 | 38.0% |
Our Town, AL | 570 | 52 | 4.0% |
Alford, FL | 570 | 35 | 30.0% |
Roberts, ID | 570 | 27 | 46.0% |
Lost Nation, IL | 570 | 42 | 16.0% |
Charter Oak, IA | 570 | 35 | 30.0% |