| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 25°F | 17°F | 1.9" |
| February | 11°F | 29°F | 19°F | 1.9" |
| March | 26°F | 43°F | 34°F | 3.2" |
| April | 37°F | 59°F | 47°F | 3.3" |
| May | 48°F | 71°F | 59°F | 5.1" |
| June | 59°F | 79°F | 69°F | 7.0" |
| July | 62°F | 83°F | 72°F | 7.4" |
| August | 59°F | 80°F | 69°F | 5.1" |
| September | 53°F | 74°F | 62°F | 8.7" |
| October | 40°F | 60°F | 49°F | 3.9" |
| November | 28°F | 46°F | 36°F | 4.9" |
| December | 14°F | 29°F | 22°F | 2.9" |
| Index | Owatonna | Minnesota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 3,433,900 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 313 |
| Days with moderate air quality | 51 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Medford, MN | 1,254 | 36 | 28.0% |
| New Richland, MN | 1,060 | 36 | 28.0% |
| Claremont, MN | 791 | 36 | 28.0% |
| Waseca, MN | 9,195 | 36 | 28.0% |
| Morristown, MN | 980 | 37 | 26.0% |
| Owatonna, MN | 26,702 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| West Whittier-Los Nietos, CA | 26,704 | 72 | 44.0% |
| Mauldin, SC | 26,699 | 46 | 8.0% |
| Brawley, CA | 26,691 | 58 | 16.0% |
| Milford, MA | 26,685 | 40 | 20.0% |
| Madison, MS | 26,675 | 44 | 12.0% |
| Owatonna, MN | 26,702 | 36 | 28.0% |