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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 25°F | 17°F | 0.2" |
| February | 11°F | 28°F | 18°F | 0.3" |
| March | 25°F | 43°F | 33°F | 1.1" |
| April | 38°F | 59°F | 47°F | 2.2" |
| May | 50°F | 69°F | 58°F | 1.3" |
| June | 61°F | 82°F | 70°F | 1.9" |
| July | 64°F | 84°F | 74°F | 0.9" |
| August | 60°F | 80°F | 70°F | 8.9" |
| September | 55°F | 76°F | 64°F | 11.0" |
| October | 44°F | 62°F | 51°F | 9.0" |
| November | 27°F | 44°F | 34°F | 0.6" |
| December | 11°F | 24°F | 17°F | 1.0" |
| Index | Greenfield | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 166,775 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 214 |
| Days with moderate air quality | 148 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Monticello, MN | 13,700 | 32 | 36.0% |
| Silver Creek, MN | 197 | 32 | 36.0% |
| Buffalo, MN | 16,413 | 32 | 36.0% |
| Waverly, MN | 1,513 | 32 | 36.0% |
| Delano, MN | 6,167 | 46 | 8.0% |
| Greenfield, MN | 3,013 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Alva, FL | 3,013 | 36 | 28.0% |
| Mansfield, PA | 3,013 | 35 | 30.0% |
| Mohnton, PA | 3,013 | 42 | 16.0% |
| Indian Hills, KY | 3,011 | 49 | 2.0% |
| Calais, ME | 3,011 | 31 | 38.0% |
| Greenfield, MN | 3,013 | 46 | 8.0% |
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