| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 26°F | 17°F | 0.8" |
| February | 10°F | 30°F | 20°F | 1.0" |
| March | 24°F | 45°F | 34°F | 1.5" |
| April | 37°F | 61°F | 48°F | 3.5" |
| May | 49°F | 73°F | 60°F | 3.9" |
| June | 60°F | 82°F | 70°F | 4.8" |
| July | 65°F | 87°F | 76°F | 3.7" |
| August | 62°F | 83°F | 72°F | 5.3" |
| September | 54°F | 77°F | 64°F | 2.9" |
| October | 41°F | 62°F | 51°F | 3.1" |
| November | 27°F | 47°F | 37°F | 1.3" |
| December | 13°F | 30°F | 21°F | 1.6" |
| Index | Richfield | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 1,774,860 | 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 | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Lilydale, MN | 892 | 46 | 8.0% |
| St. Paul, MN | 305,877 | 46 | 8.0% |
| Brooklyn Center, MN | 30,755 | 46 | 8.0% |
| St. Anthony, MN | 9,035 | 46 | 8.0% |
| Orono, MN | 8,217 | 46 | 8.0% |
| Richfield, MN | 36,253 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Elmont, NY | 36,245 | 51 | 2.0% |
| Calumet City, IL | 36,229 | 55 | 10.0% |
| Bettendorf, IA | 36,214 | 46 | 8.0% |
| Winchester, NV | 36,302 | 54 | 8.0% |
| Oak Creek, WI | 36,321 | 39 | 22.0% |
| Richfield, MN | 36,253 | 46 | 8.0% |
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