| 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. |
| Pewaukee, WI | 14,561 | 44 | 12.0% |
| Merton, WI | 3,721 | 44 | 12.0% |
| Port Washington, WI | 11,881 | 44 | 12.0% |
| Wauwatosa, WI | 48,143 | 44 | 12.0% |
| Milwaukee, WI | 592,649 | 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% |
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