| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 28°F | 21°F | 0.6" |
| February | 15°F | 29°F | 22°F | 2.8" |
| March | 27°F | 43°F | 34°F | 2.9" |
| April | 37°F | 55°F | 45°F | 3.1" |
| May | 47°F | 67°F | 56°F | 8.9" |
| June | 56°F | 76°F | 66°F | 19.6" |
| July | 61°F | 80°F | 70°F | 14.9" |
| August | 60°F | 78°F | 69°F | 2.3" |
| September | 53°F | 72°F | 61°F | 10.4" |
| October | 42°F | 59°F | 50°F | 6.6" |
| November | 31°F | 46°F | 38°F | 3.6" |
| December | 20°F | 32°F | 26°F | 1.8" |
| Index | Merton | Wisconsin | National |
| Air quality index | 44 | 69 | 42 |
| Pollution index | 2,032,370 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 254 |
| Days with moderate air quality | 108 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Nashotah, WI | 1,287 | 37 | 26.0% |
| Chenequa, WI | 583 | 37 | 26.0% |
| Dousman, WI | 2,116 | 37 | 26.0% |
| Hustisford, WI | 994 | 37 | 26.0% |
| Sullivan, WI | 710 | 37 | 26.0% |
| Merton, WI | 3,721 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Boyne City, MI | 3,721 | 36 | 28.0% |
| West Menlo Park, CA | 3,720 | 43 | 14.0% |
| Quitman, GA | 3,720 | 35 | 30.0% |
| Marlboro, NY | 3,720 | 36 | 28.0% |
| Johnson, AR | 3,719 | 44 | 12.0% |
| Merton, WI | 3,721 | 44 | 12.0% |
Here are the best places to live in Wisconsin
10 Best cities in Wisconsin for employment
Top 10 cities in Wisconsin with the best education system
Check out the 10 safest cities in Wisconsin