| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 28°F | 21°F | 1.8" |
| February | 15°F | 30°F | 22°F | 1.1" |
| March | 26°F | 43°F | 34°F | 3.6" |
| April | 36°F | 56°F | 45°F | 7.5" |
| May | 47°F | 68°F | 56°F | 4.1" |
| June | 56°F | 77°F | 66°F | 4.1" |
| July | 60°F | 81°F | 70°F | 1.5" |
| August | 59°F | 78°F | 68°F | 4.1" |
| September | 51°F | 72°F | 61°F | 5.1" |
| October | 42°F | 59°F | 50°F | 5.8" |
| November | 31°F | 46°F | 38°F | 2.1" |
| December | 20°F | 32°F | 26°F | 4.5" |
| Index | Mequon | Wisconsin | National |
| Air quality index | 44 | 69 | 42 |
| Pollution index | 17,168,000 | 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 | 0.030% |
| Benzene | 0.160% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.160% |
| Mercury | 0.150% |
| City | Population | Air Quality Index | National Avg. |
| Slinger, WI | 5,500 | 44 | 12.0% |
| Germantown, WI | 20,142 | 44 | 12.0% |
| Butler, WI | 1,964 | 44 | 12.0% |
| Fox Point, WI | 6,623 | 44 | 12.0% |
| Whitefish Bay, WI | 13,890 | 44 | 12.0% |
| Mequon, WI | 24,357 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Wasaga Beach, ON | 24,372 | n/a | |
| Arnold, MD | 24,334 | 46 | 8.0% |
| Sept-Îles, QC | 24,383 | n/a | |
| Lodi, NJ | 24,389 | 51 | 2.0% |
| Inkster, MI | 24,398 | 56 | 12.0% |
| Mequon, WI | 24,357 | 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
See the best places to live in & around Mequon