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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 25°F | 16°F | 3.4" |
| February | 11°F | 28°F | 19°F | 3.1" |
| March | 25°F | 44°F | 33°F | 2.2" |
| April | 39°F | 59°F | 48°F | 6.8" |
| May | 51°F | 71°F | 59°F | 4.3" |
| June | 62°F | 83°F | 71°F | 3.2" |
| July | 64°F | 85°F | 74°F | 4.7" |
| August | 61°F | 80°F | 70°F | 6.9" |
| September | 53°F | 76°F | 62°F | 5.7" |
| October | 44°F | 64°F | 52°F | 5.9" |
| November | 28°F | 46°F | 35°F | 2.9" |
| December | 9°F | 24°F | 16°F | 0.2" |
| Index | St. Peter | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 848,330 | 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 | 0.000% |
| Lead | 0.003% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Janesville, MN | 2,502 | 36 | 28.0% |
| Eagle Lake, MN | 3,064 | 46 | 8.0% |
| North Mankato, MN | 13,903 | 46 | 8.0% |
| Cleveland, MN | 792 | 46 | 8.0% |
| Madison Lake, MN | 1,081 | 46 | 8.0% |
| St. Peter, MN | 11,934 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Blackfoot, ID | 11,936 | 27 | 46.0% |
| Union, MO | 11,931 | 54 | 8.0% |
| Dranesville, VA | 11,929 | 47 | 6.0% |
| Elon, NC | 11,941 | 31 | 38.0% |
| Lake Los Angeles, CA | 11,926 | 72 | 44.0% |
| St. Peter, MN | 11,934 | 46 | 8.0% |
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