| 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 | Mendota | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 596,618 | 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 | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Vermillion, MN | 484 | 37 | 26.0% |
| Rosemount, MN | 24,792 | 46 | 8.0% |
| Gem Lake, MN | 528 | 46 | 8.0% |
| Mahtomedi, MN | 8,232 | 46 | 8.0% |
| Oakdale, MN | 27,925 | 46 | 8.0% |
| Mendota, MN | 149 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Calvert, AL | 149 | 42 | 16.0% |
| Rudy, AR | 149 | 36 | 28.0% |
| Blairsburg, IA | 149 | 37 | 26.0% |
| Calhoun, IL | 149 | 36 | 28.0% |
| Littleton, IL | 149 | 41 | 18.0% |
| Mendota, MN | 149 | 46 | 8.0% |
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