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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 30°F | 20°F | 1.5" |
| February | 13°F | 33°F | 23°F | 1.5" |
| March | 24°F | 47°F | 35°F | 2.6" |
| April | 35°F | 61°F | 48°F | 4.4" |
| May | 46°F | 73°F | 59°F | 4.0" |
| June | 57°F | 81°F | 69°F | 5.9" |
| July | 60°F | 85°F | 73°F | 4.9" |
| August | 59°F | 83°F | 71°F | 4.8" |
| September | 51°F | 77°F | 63°F | 3.5" |
| October | 40°F | 63°F | 51°F | 3.2" |
| November | 28°F | 49°F | 38°F | 2.1" |
| December | 17°F | 34°F | 25°F | 2.3" |
| Index | Marshall | Wisconsin | National |
| Air quality index | 37 | 69 | 42 |
| Pollution index | 12,871,100 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 203 |
| Days with good air quality | 191 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.160% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.010% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Rockdale, WI | 216 | 37 | 26.0% |
| Johnson Creek, WI | 3,143 | 37 | 26.0% |
| Jefferson, WI | 8,237 | 37 | 26.0% |
| Waterloo, WI | 3,450 | 37 | 26.0% |
| Lake Mills, WI | 6,132 | 37 | 26.0% |
| Marshall, WI | 4,124 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Franklin, NC | 4,123 | 41 | 18.0% |
| Madawaska Valley, ON | 4,125 | n/a | |
| Deer Park, IL | 4,126 | 55 | 10.0% |
| Mahanoy City, PA | 4,121 | 42 | 16.0% |
| Meridian, PA | 4,121 | 31 | 38.0% |
| Marshall, WI | 4,124 | 37 | 26.0% |
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