| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 34°F | 24°F | 1.9" |
| February | 17°F | 34°F | 25°F | 2.4" |
| March | 31°F | 52°F | 40°F | 3.0" |
| April | 41°F | 65°F | 52°F | 4.3" |
| May | 53°F | 75°F | 63°F | 6.0" |
| June | 62°F | 84°F | 72°F | 4.4" |
| July | 65°F | 86°F | 75°F | 7.8" |
| August | 63°F | 83°F | 72°F | 4.4" |
| September | 54°F | 78°F | 65°F | 5.3" |
| October | 44°F | 66°F | 53°F | 5.8" |
| November | 32°F | 52°F | 41°F | 3.9" |
| December | 21°F | 37°F | 28°F | 4.0" |
| Index | Eddyville | Iowa | National |
| Air quality index | 39 | 39 | 50 |
| Pollution index | 1,478,700 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 306 |
| Days with moderate air quality | 59 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City, State | Population | Air Quality Index | National Avg. |
| Ottumwa, IA | 24,709 | 29 | 42% |
| Kirkville, IA | 179 | 35 | 30% |
| Fremont, IA | 745 | 35 | 30% |
| Keomah Village, IA | 69 | 35 | 30% |
| Rose Hill, IA | 160 | 35 | 30% |
| Eddyville, IA | 1,207 | 39 | 22% |
| City, State | Population | Air Quality Index | National Avg. |
| Lakeport, TX | 1,207 | 37 | 26% |
| Ruckersville, VA | 1,206 | 40 | 20% |
| Log Lane Village, CO | 1,206 | 45 | 10% |
| Clark, SD | 1,208 | 25 | 50% |
| Boston Heights, OH | 1,208 | 43 | 14% |
| Eddyville, IA | 1,207 | 39 | 22% |
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