| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 16°F | 0.5" |
| February | 8°F | 26°F | 17°F | 0.4" |
| March | 20°F | 41°F | 29°F | 1.2" |
| April | 30°F | 52°F | 40°F | 2.0" |
| May | 40°F | 65°F | 51°F | 3.7" |
| June | 49°F | 74°F | 61°F | 3.9" |
| July | 56°F | 81°F | 68°F | 3.7" |
| August | 54°F | 78°F | 66°F | 3.8" |
| September | 47°F | 71°F | 58°F | 2.8" |
| October | 37°F | 56°F | 46°F | 3.0" |
| November | 26°F | 43°F | 34°F | 1.1" |
| December | 12°F | 27°F | 20°F | 1.3" |
| Index | Marengo | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 1,273,320 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 38 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.002% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Grand View, WI | 103 | 35 | 30.0% |
| Birch Hill, WI | 206 | 35 | 30.0% |
| Odanah, WI | 51 | 35 | 30.0% |
| Mason, WI | 109 | 35 | 30.0% |
| Franks Field, WI | 151 | 35 | 30.0% |
| Marengo, WI | 137 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Pine Apple, AL | 137 | 52 | 4.0% |
| Waterloo, AL | 137 | 37 | 26.0% |
| Washington, CA | 137 | 44 | 12.0% |
| Pitkin, CO | 137 | 16 | 68.0% |
| Knoxville, GA | 137 | 38 | 24.0% |
| Marengo, WI | 137 | 35 | 30.0% |
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