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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 33°F | 24°F | 2.2" |
| February | 20°F | 34°F | 26°F | 3.0" |
| March | 33°F | 52°F | 42°F | 3.7" |
| April | 41°F | 63°F | 51°F | 6.9" |
| May | 52°F | 75°F | 63°F | 8.3" |
| June | 62°F | 82°F | 72°F | 7.5" |
| July | 66°F | 86°F | 76°F | 8.9" |
| August | 63°F | 84°F | 73°F | 7.8" |
| September | 54°F | 77°F | 64°F | 4.7" |
| October | 43°F | 66°F | 53°F | 5.8" |
| November | 31°F | 50°F | 40°F | 6.8" |
| December | 18°F | 34°F | 26°F | 3.5" |
| Index | Bettendorf | Iowa | National |
| Air quality index | 46 | 39 | 42 |
| Pollution index | 1,753,590 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 217 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Princeton, IA | 942 | 42 | 16.0% |
| Cordova, IL | 685 | 42 | 16.0% |
| McCausland, IA | 379 | 42 | 16.0% |
| Blue Grass, IA | 2,058 | 46 | 8.0% |
| Cleveland, IL | 232 | 46 | 8.0% |
| Bettendorf, IA | 36,214 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Calumet City, IL | 36,229 | 55 | 10.0% |
| Elmont, NY | 36,245 | 51 | 2.0% |
| Richfield, MN | 36,253 | 46 | 8.0% |
| Brighton, NY | 36,163 | 37 | 26.0% |
| Lewiston, ME | 36,158 | 31 | 38.0% |
| Bettendorf, IA | 36,214 | 46 | 8.0% |
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