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 | Defiance | Iowa | National |
Air quality index | 40 | 39 | 42 |
Pollution index | 517,691 | 1,154,535 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 283 |
Days with moderate air quality | 82 |
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 | 0.002% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Denison, IA | 8,319 | 35 | 30.0% |
Westphalia, IA | 161 | 40 | 20.0% |
Portsmouth, IA | 171 | 40 | 20.0% |
Manilla, IA | 826 | 40 | 20.0% |
Arion, IA | 106 | 40 | 20.0% |
Defiance, IA | 216 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
Morrison Crossroads, AL | 216 | 38 | 24.0% |
Cypress, IL | 216 | 44 | 12.0% |
Rantoul, KS | 216 | 41 | 18.0% |
Fountain, MI | 216 | 36 | 28.0% |
Heidelberg, MN | 216 | 46 | 8.0% |
Defiance, IA | 216 | 40 | 20.0% |