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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 30°F | 22°F | 2.0" |
| February | 15°F | 29°F | 21°F | 1.5" |
| March | 25°F | 42°F | 32°F | 4.2" |
| April | 36°F | 55°F | 44°F | 2.5" |
| May | 46°F | 64°F | 54°F | 5.1" |
| June | 57°F | 77°F | 66°F | 1.9" |
| July | 61°F | 80°F | 70°F | 6.2" |
| August | 62°F | 79°F | 69°F | 5.1" |
| September | 55°F | 74°F | 63°F | 2.9" |
| October | 46°F | 61°F | 52°F | 4.4" |
| November | 31°F | 46°F | 37°F | 3.9" |
| December | 17°F | 29°F | 23°F | 26.5" |
| Index | Brillion | Wisconsin | National |
| Air quality index | 37 | 69 | 42 |
| Pollution index | 2,867,440 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 304 |
| Days with moderate air quality | 59 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.050% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| St. Nazianz, WI | 942 | 36 | 28.0% |
| Whitelaw, WI | 769 | 36 | 28.0% |
| Valders, WI | 862 | 36 | 28.0% |
| Denmark, WI | 2,346 | 36 | 28.0% |
| Collins, WI | 209 | 36 | 28.0% |
| Brillion, WI | 3,108 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Warsaw, NC | 3,108 | 40 | 20.0% |
| Ladysmith, WI | 3,108 | 34 | 32.0% |
| Boiling Springs, PA | 3,107 | 44 | 12.0% |
| Orofino, ID | 3,109 | 29 | 42.0% |
| Mount Pocono, PA | 3,106 | 34 | 32.0% |
| Brillion, WI | 3,108 | 37 | 26.0% |
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