| 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 | Le Claire | 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. |
| McCausland, IA | 379 | 42 | 16.0% |
| Princeton, IA | 942 | 42 | 16.0% |
| Hillsdale, IL | 531 | 42 | 16.0% |
| Camanche, IA | 4,342 | 42 | 16.0% |
| Cordova, IL | 685 | 42 | 16.0% |
| Le Claire, IA | 3,969 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Norton, VA | 3,969 | 45 | 10.0% |
| Coronita, CA | 3,968 | 89 | 78.0% |
| Fulton, MS | 3,968 | 39 | 22.0% |
| Elkin, NC | 3,968 | 45 | 10.0% |
| Asphodel-Norwood, ON | 3,968 | n/a | |
| Le Claire, IA | 3,969 | 46 | 8.0% |
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