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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 4°F | 21°F | 12°F | 3.3" | 
| February | 6°F | 25°F | 15°F | 0.8" | 
| March | 24°F | 41°F | 31°F | 7.8" | 
| April | 36°F | 57°F | 45°F | 4.5" | 
| May | 46°F | 70°F | 57°F | 8.4" | 
| June | 56°F | 77°F | 66°F | 7.9" | 
| July | 61°F | 83°F | 72°F | 8.0" | 
| August | 57°F | 79°F | 68°F | 10.9" | 
| September | 48°F | 71°F | 59°F | 5.3" | 
| October | 38°F | 57°F | 46°F | 8.4" | 
| November | 25°F | 42°F | 33°F | 2.2" | 
| December | 10°F | 26°F | 18°F | 2.4" | 
| Index | Willmar | Minnesota | National | 
| Air quality index | 32 | 35 | 42 | 
| Pollution index | 1,148,020 | 1,854,519 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 344 | 
| Days with good air quality | 313 | 
| Days with moderate air quality | 31 | 
| Days w/ poor A.Q. for sensitive groups | 0 | 
| Days with unhealthy air quality | 0 | 
| Pollutant | Total | 
| Arsenic | 0.010% | 
| Benzene | 0.050% | 
| Carbon Tetrachloride | 0.001% | 
| Lead | 0.020% | 
| Mercury | 0.020% | 
| City | Population | Air Quality Index | National Avg. | 
| Pennock, MN | 484 | 32 | 36.0% | 
| Lake Lillian, MN | 258 | 32 | 36.0% | 
| Kerkhoven, MN | 714 | 32 | 36.0% | 
| Prinsburg, MN | 561 | 32 | 36.0% | 
| New London, MN | 1,249 | 32 | 36.0% | 
| Willmar, MN | 19,728 | 32 | 36.0% | 
| City | Population | Air Quality Index | National Avg. | 
| North Bay Shore, NY | 19,728 | 43 | 14.0% | 
| Saco, ME | 19,716 | 40 | 20.0% | 
| Niskayuna, NY | 19,741 | 37 | 26.0% | 
| West Mifflin, PA | 19,742 | 56 | 12.0% | 
| Shafter, CA | 19,743 | 67 | 34.0% | 
| Willmar, MN | 19,728 | 32 | 36.0% |