| 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 | Markesan | Wisconsin | National |
| Air quality index | 40 | 69 | 42 |
| Pollution index | 1,519,720 | 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 | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brandon, WI | 882 | 36 | 28.0% |
| Green Lake, WI | 873 | 36 | 28.0% |
| Ripon, WI | 7,802 | 36 | 28.0% |
| Marquette, WI | 195 | 40 | 20.0% |
| Fox Lake, WI | 1,844 | 40 | 20.0% |
| Markesan, WI | 1,313 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Melcher-Dallas, IA | 1,313 | 39 | 22.0% |
| Cortland West, NY | 1,313 | 34 | 32.0% |
| Apache, OK | 1,313 | 43 | 14.0% |
| Buffalo, OK | 1,313 | 15 | 70.0% |
| Forest View, IL | 1,312 | 55 | 10.0% |
| Markesan, WI | 1,313 | 40 | 20.0% |
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