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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 | Agency | 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. |
| Leando, IA | 21 | 29 | 42.0% |
| Douds, IA | 84 | 29 | 42.0% |
| Batavia, IA | 557 | 29 | 42.0% |
| Ottumwa, IA | 24,505 | 29 | 42.0% |
| Drakesville, IA | 220 | 29 | 42.0% |
| Agency, IA | 625 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Lovilia, IA | 625 | 39 | 22.0% |
| Zanesville, IN | 625 | 31 | 38.0% |
| Eminence, MO | 625 | 39 | 22.0% |
| Ansonville, NC | 625 | 49 | 2.0% |
| Sedillo, NM | 625 | 53 | 6.0% |
| Agency, IA | 625 | 29 | 42.0% |
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