| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 27°F | 20°F | 2.0" |
| February | 14°F | 29°F | 21°F | 2.4" |
| March | 27°F | 44°F | 34°F | 4.7" |
| April | 37°F | 57°F | 46°F | 6.9" |
| May | 48°F | 69°F | 57°F | 5.9" |
| June | 57°F | 78°F | 67°F | 8.3" |
| July | 61°F | 81°F | 70°F | 6.6" |
| August | 60°F | 79°F | 69°F | 4.8" |
| September | 52°F | 73°F | 62°F | 7.0" |
| October | 41°F | 60°F | 50°F | 5.5" |
| November | 30°F | 46°F | 37°F | 4.1" |
| December | 18°F | 32°F | 25°F | 2.6" |
| Index | Waupun | Wisconsin | National |
| Air quality index | 40 | 69 | 42 |
| Pollution index | 1,353,830 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 297 |
| Days with moderate air quality | 67 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Theresa, WI | 1,235 | 36 | 28.0% |
| North Fond du Lac, WI | 5,236 | 36 | 28.0% |
| Green Lake, WI | 905 | 36 | 28.0% |
| Oakfield, WI | 1,119 | 36 | 28.0% |
| Brandon, WI | 914 | 36 | 28.0% |
| Waupun, WI | 11,501 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Forestville, MD | 11,496 | 47 | 6.0% |
| Webster, TX | 11,507 | 52 | 4.0% |
| Lighthouse Point, FL | 11,493 | 41 | 18.0% |
| Selma, TX | 11,484 | 49 | 2.0% |
| Robstown, TX | 11,483 | 30 | 40.0% |
| Waupun, WI | 11,501 | 40 | 20.0% |
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