| 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 | DeForest | Wisconsin | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 350,021 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Merrimac, WI | 672 | 35 | 30.0% |
| Poynette, WI | 2,507 | 35 | 30.0% |
| Lake Wisconsin, WI | 4,573 | 35 | 30.0% |
| Lodi, WI | 3,073 | 35 | 30.0% |
| Marshall, WI | 3,975 | 37 | 26.0% |
| DeForest, WI | 10,473 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Covington, LA | 10,471 | 30 | 40.0% |
| Cusseta-Chattahoochee County, GA | 10,470 | 42 | 16.0% |
| Burley, ID | 10,476 | 20 | 60.0% |
| Wasilla, AK | 10,469 | 31 | 38.0% |
| North Bellport, NY | 10,468 | 43 | 14.0% |
| DeForest, WI | 10,473 | 39 | 22.0% |
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