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| 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 | Oskaloosa | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 684,464 | 1,154,535 | 2,726,193 |
| 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fremont, IA | 804 | 35 | 30.0% |
| Kirkville, IA | 251 | 35 | 30.0% |
| Barnes City, IA | 147 | 35 | 30.0% |
| Gibson, IA | 30 | 35 | 30.0% |
| What Cheer, IA | 715 | 35 | 30.0% |
| Oskaloosa, IA | 11,727 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Evanston, WY | 11,727 | 44 | 12.0% |
| Coldstream, BC | 11,728 | n/a | |
| Webster, MA | 11,719 | 40 | 20.0% |
| Florham Park, NJ | 11,719 | 51 | 2.0% |
| Wanaque, NJ | 11,719 | 51 | 2.0% |
| Oskaloosa, IA | 11,727 | 39 | 22.0% |
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