In Calumet County, crews had to rescue a snowmobiler who fell into Lake Winnebago over the weekend.
A 33-year-old man was snowmobiling with his brother, when he hit an ice shove and disappeared.
Heavy winds and snow made the search difficult, as white-out conditions were created.
Eventually, a DNR plane found the man, and he was rescued about two hours after the initial crash.
"The cold is a severe problem, but the wind and blowing of snow caused visibility issues and we had difficulty getting people up to the person," said Mark Ott, Calumet County Sheriff.
Authorities say alcohol was not a factor in the accident.
The man, whose name has not been released, is being treated for hypothermia.