| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 25°F | 17°F | 0.5" |
| February | 13°F | 29°F | 20°F | 0.7" |
| March | 26°F | 44°F | 34°F | 1.6" |
| April | 39°F | 59°F | 48°F | 3.9" |
| May | 49°F | 71°F | 59°F | 4.5" |
| June | 60°F | 80°F | 70°F | 5.7" |
| July | 65°F | 85°F | 75°F | 4.4" |
| August | 62°F | 82°F | 72°F | 5.8" |
| September | 55°F | 75°F | 64°F | 3.4" |
| October | 42°F | 60°F | 50°F | 3.2" |
| November | 29°F | 46°F | 37°F | 1.4" |
| December | 15°F | 29°F | 21°F | 1.2" |
| Index | Dellwood | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 409,264 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| St. Marys Point, MN | 440 | 37 | 26.0% |
| Lakeland Shores, MN | 355 | 46 | 8.0% |
| Hudson, WI | 13,912 | 46 | 8.0% |
| Arden Hills, MN | 10,276 | 46 | 8.0% |
| Mendota, MN | 149 | 46 | 8.0% |
| Dellwood, MN | 1,295 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Marcus, IA | 1,295 | 35 | 30.0% |
| Harper, KS | 1,295 | 40 | 20.0% |
| Robinhood, MS | 1,295 | 44 | 12.0% |
| Oxford, NS | 1,295 | n/a | |
| Canton Valley, CT | 1,294 | 41 | 18.0% |
| Dellwood, MN | 1,295 | 46 | 8.0% |
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