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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 31°F | 23°F | 1.3" |
| February | 16°F | 32°F | 24°F | 1.2" |
| March | 28°F | 45°F | 36°F | 2.4" |
| April | 37°F | 58°F | 46°F | 3.9" |
| May | 47°F | 70°F | 58°F | 3.3" |
| June | 57°F | 79°F | 67°F | 3.7" |
| July | 61°F | 83°F | 72°F | 4.6" |
| August | 60°F | 81°F | 70°F | 4.0" |
| September | 53°F | 74°F | 63°F | 3.0" |
| October | 43°F | 62°F | 52°F | 3.1" |
| November | 32°F | 49°F | 40°F | 1.8" |
| December | 21°F | 36°F | 28°F | 1.8" |
| Index | Union Grove | Wisconsin | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 3,131,700 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 203 |
| Days with good air quality | 174 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.004% |
| Mercury | 0.360% |
| City | Population | Air Quality Index | National Avg. |
| Lake Ivanhoe, WI | 398 | 37 | 26.0% |
| Mukwonago, WI | 8,142 | 37 | 26.0% |
| Potter Lake, WI | 936 | 37 | 26.0% |
| Burlington, WI | 10,911 | 39 | 22.0% |
| Powers Lake, WI | 1,433 | 39 | 22.0% |
| Union Grove, WI | 5,031 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Swoyersville, PA | 5,031 | 38 | 24.0% |
| Glendive, MT | 5,030 | 34 | 32.0% |
| Pinehurst, TX | 5,030 | 52 | 4.0% |
| Polson, MT | 5,033 | 37 | 26.0% |
| Belleview, FL | 5,028 | 38 | 24.0% |
| Union Grove, WI | 5,031 | 39 | 22.0% |
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