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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 32°F | 23°F | 1.0" |
| February | 17°F | 35°F | 25°F | 1.1" |
| March | 30°F | 51°F | 39°F | 2.4" |
| April | 41°F | 64°F | 52°F | 4.8" |
| May | 51°F | 74°F | 62°F | 4.6" |
| June | 62°F | 84°F | 73°F | 6.1" |
| July | 66°F | 86°F | 75°F | 4.7" |
| August | 64°F | 84°F | 73°F | 4.5" |
| September | 55°F | 78°F | 66°F | 3.3" |
| October | 43°F | 65°F | 53°F | 3.3" |
| November | 31°F | 51°F | 40°F | 1.9" |
| December | 19°F | 35°F | 27°F | 1.9" |
| Index | Wellman | Iowa | National |
| Air quality index | 35 | 39 | 42 |
| Pollution index | 577,838 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 278 |
| Days with moderate air quality | 86 |
| 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 | 0.090% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| University Heights, IA | 1,332 | 35 | 30.0% |
| Riverside, IA | 1,021 | 35 | 30.0% |
| West Chester, IA | 87 | 35 | 30.0% |
| Williamsburg, IA | 3,152 | 35 | 30.0% |
| Washington, IA | 7,318 | 35 | 30.0% |
| Wellman, IA | 1,428 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Kincaid, IL | 1,428 | 40 | 20.0% |
| Breckenridge, MI | 1,428 | 26 | 48.0% |
| New Rockford, ND | 1,428 | 36 | 28.0% |
| Elkhart, TX | 1,428 | 36 | 28.0% |
| Summerdale, AL | 1,429 | 37 | 26.0% |
| Wellman, IA | 1,428 | 35 | 30.0% |
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