| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 28°F | 20°F | 1.2" |
| February | 14°F | 30°F | 22°F | 1.0" |
| March | 25°F | 44°F | 34°F | 2.2" |
| April | 37°F | 58°F | 47°F | 4.0" |
| May | 48°F | 70°F | 58°F | 4.0" |
| June | 58°F | 80°F | 69°F | 5.4" |
| July | 61°F | 83°F | 72°F | 4.1" |
| August | 60°F | 81°F | 70°F | 4.0" |
| September | 52°F | 74°F | 63°F | 3.5" |
| October | 42°F | 61°F | 51°F | 2.9" |
| November | 30°F | 47°F | 38°F | 2.2" |
| December | 18°F | 32°F | 25°F | 1.5" |
| Index | Fond du Lac | Wisconsin | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 2,555,300 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 202 |
| Days with good air quality | 195 |
| Days with moderate air quality | 7 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.002% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Van Dyne, WI | 236 | 36 | 28.0% |
| Lomira, WI | 2,361 | 36 | 28.0% |
| Rosendale, WI | 906 | 36 | 28.0% |
| Campbellsport, WI | 1,830 | 36 | 28.0% |
| St. Peter, WI | 1,362 | 36 | 28.0% |
| Fond du Lac, WI | 42,944 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Goose Creek, SC | 42,944 | 38 | 24.0% |
| Winter Haven, FL | 42,933 | 36 | 28.0% |
| DeKalb, IL | 42,961 | 42 | 16.0% |
| Vaudreuil-Dorion, QC | 42,920 | n/a | |
| St. Thomas, ON | 42,918 | n/a | |
| Fond du Lac, WI | 42,944 | 36 | 28.0% |
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