| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 27°F | 20°F | 1.5" |
| February | 14°F | 28°F | 21°F | 0.6" |
| March | 24°F | 39°F | 31°F | 1.2" |
| April | 35°F | 51°F | 42°F | 3.1" |
| May | 45°F | 64°F | 53°F | 3.2" |
| June | 55°F | 73°F | 63°F | 5.3" |
| July | 61°F | 79°F | 69°F | 5.9" |
| August | 60°F | 76°F | 68°F | 3.2" |
| September | 54°F | 69°F | 61°F | 3.0" |
| October | 44°F | 57°F | 50°F | 4.2" |
| November | 32°F | 44°F | 38°F | 2.8" |
| December | 20°F | 31°F | 26°F | 1.3" |
| Index | Casco | Wisconsin | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 1,046,860 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 311 |
| Days with moderate air quality | 54 |
| 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 | 0.001% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Kewaunee, WI | 2,849 | 36 | 28.0% |
| Denmark, WI | 2,346 | 36 | 28.0% |
| Algoma, WI | 3,044 | 36 | 28.0% |
| Dyckesville, WI | 450 | 36 | 28.0% |
| Forestville, WI | 475 | 36 | 28.0% |
| Casco, WI | 597 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Yakutat, AK | 597 | 20 | 60.0% |
| Funston, GA | 597 | 40 | 20.0% |
| Denver, IN | 597 | 37 | 26.0% |
| Higbee, MO | 597 | 38 | 24.0% |
| Lewistown, MO | 597 | 41 | 18.0% |
| Casco, WI | 597 | 36 | 28.0% |
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