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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 33°F | 24°F | 0.7" |
| February | 17°F | 36°F | 26°F | 1.1" |
| March | 31°F | 52°F | 40°F | 2.3" |
| April | 41°F | 65°F | 52°F | 4.7" |
| May | 51°F | 74°F | 62°F | 5.0" |
| June | 62°F | 83°F | 72°F | 6.5" |
| July | 65°F | 86°F | 75°F | 4.5" |
| August | 63°F | 84°F | 73°F | 5.2" |
| September | 54°F | 78°F | 65°F | 3.7" |
| October | 43°F | 65°F | 53°F | 3.0" |
| November | 32°F | 52°F | 41°F | 2.0" |
| December | 20°F | 36°F | 28°F | 1.9" |
| Index | Eldon | Iowa | National |
| Air quality index | 29 | 39 | 42 |
| Pollution index | 464,333 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 120 |
| Days with good air quality | 101 |
| Days with moderate air quality | 19 |
| 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 | 0.320% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bloomfield, IA | 2,681 | 29 | 42.0% |
| Drakesville, IA | 220 | 29 | 42.0% |
| Batavia, IA | 557 | 29 | 42.0% |
| Ottumwa, IA | 24,505 | 29 | 42.0% |
| Keosauqua, IA | 915 | 29 | 42.0% |
| Eldon, IA | 921 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Tres Pinos, CA | 921 | 37 | 26.0% |
| Terramuggus, CT | 921 | 41 | 18.0% |
| Coleman, FL | 921 | 38 | 24.0% |
| Patoka, IN | 921 | 36 | 28.0% |
| Falkner, MS | 921 | 39 | 22.0% |
| Eldon, IA | 921 | 29 | 42.0% |
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