| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 26°F | 17°F | 0.1" |
| February | 11°F | 29°F | 20°F | 3.2" |
| March | 26°F | 44°F | 34°F | 2.7" |
| April | 38°F | 59°F | 48°F | 2.7" |
| May | 49°F | 71°F | 59°F | 3.9" |
| June | 59°F | 80°F | 69°F | 4.8" |
| July | 63°F | 85°F | 74°F | 3.7" |
| August | 61°F | 82°F | 71°F | 4.6" |
| September | 54°F | 75°F | 63°F | 2.9" |
| October | 41°F | 61°F | 50°F | 1.6" |
| November | 30°F | 46°F | 37°F | 1.0" |
| December | 15°F | 29°F | 22°F | 0.0" |
| Index | Plum City | Wisconsin | National |
| Air quality index | 37 | 69 | 42 |
| Pollution index | 1,299,880 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 216 |
| Days with good air quality | 203 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Nelson, WI | 317 | 15 | 70.0% |
| Arkansaw, WI | 350 | 34 | 32.0% |
| Downsville, WI | 206 | 34 | 32.0% |
| Durand, WI | 1,818 | 34 | 32.0% |
| Bay City, WI | 458 | 37 | 26.0% |
| Plum City, WI | 624 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Nucla, CO | 624 | 44 | 12.0% |
| Kingman, IN | 624 | 45 | 10.0% |
| D'Lo, MS | 624 | 44 | 12.0% |
| Atlantic, NC | 624 | 37 | 26.0% |
| Warsaw, OH | 624 | 41 | 18.0% |
| Plum City, WI | 624 | 37 | 26.0% |