| 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 | Milltown | Wisconsin | National |
| Air quality index | 46 | 69 | 42 |
| Pollution index | 1,318,690 | 2,842,418 | 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 | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Shafer, MN | 1,155 | 46 | 8.0% |
| Osceola, WI | 2,521 | 46 | 8.0% |
| Frederic, WI | 1,171 | 46 | 8.0% |
| Taylors Falls, MN | 1,166 | 46 | 8.0% |
| St. Croix Falls, WI | 1,863 | 46 | 8.0% |
| Milltown, WI | 1,007 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Franklin, GA | 1,007 | 52 | 4.0% |
| Naalehu, HI | 1,007 | 16 | 68.0% |
| Sidney, IA | 1,007 | 40 | 20.0% |
| Waynetown, IN | 1,007 | 42 | 16.0% |
| Hilltop, MN | 1,007 | 46 | 8.0% |
| Milltown, WI | 1,007 | 46 | 8.0% |
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