Weather history and climate summary information is available for the following locations:
- LaCrosse
- Madison
- Milwaukee
Warmest December Days
The warmest December days in Wisconsin are:
| Milwaukee, Wisconsin | 2001 | 68°F |
| LaCrosse, Wisconsin | 1998 | 66.2°F |
| Milwaukee, Wisconsin | 2012 | 64.9°F |
| Madison, Wisconsin | 2012 | 64.9°F |
| LaCrosse, Wisconsin | 2001 | 64.4°F |
Coldest December Days
The coldest December days in Wisconsin were:
| LaCrosse, Wisconsin | 1983 | -30.1°F |
| LaCrosse, Wisconsin | 2000 | -26°F |
| Madison, Wisconsin | 1983 | -25.1°F |
| LaCrosse, Wisconsin | 1989 | -22.2°F |
| LaCrosse, Wisconsin | 1990 | -22.2°F |
Wettest December Days
The wettest single days in December occurred:
| Madison, Wisconsin | 1990 | 1.5 inches |
| Milwaukee, Wisconsin | 1982 | 1.5 inches |
| Milwaukee, Wisconsin | 1987 | 1.5 inches |
| Milwaukee, Wisconsin | 1985 | 1.3 inches |
| LaCrosse, Wisconsin | 2007 | 1.2 inches |