| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 15°F | 0.8" |
| February | 8°F | 27°F | 17°F | 2.3" |
| March | 23°F | 43°F | 32°F | 2.1" |
| April | 36°F | 57°F | 45°F | 4.7" |
| May | 46°F | 70°F | 57°F | 5.4" |
| June | 56°F | 78°F | 67°F | 5.9" |
| July | 61°F | 83°F | 71°F | 6.7" |
| August | 58°F | 80°F | 68°F | 7.0" |
| September | 51°F | 73°F | 61°F | 4.7" |
| October | 39°F | 58°F | 48°F | 4.8" |
| November | 27°F | 44°F | 35°F | 3.8" |
| December | 13°F | 28°F | 20°F | 2.5" |
| Index | Marine on St. Croix | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 2,108,790 | 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 | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Roberts, WI | 1,849 | 37 | 26.0% |
| Dellwood, MN | 1,295 | 46 | 8.0% |
| Hugo, MN | 15,008 | 46 | 8.0% |
| Oakdale, MN | 27,925 | 46 | 8.0% |
| Wyoming, MN | 7,976 | 46 | 8.0% |
| Marine on St. Croix, MN | 671 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Geyserville, CA | 671 | 34 | 32.0% |
| Stonington, IL | 671 | 44 | 12.0% |
| Rose City, MI | 671 | 26 | 48.0% |
| Clear Lake, MN | 671 | 32 | 36.0% |
| Jasper, MN | 671 | 36 | 28.0% |
| Marine on St. Croix, MN | 671 | 46 | 8.0% |
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