There are two reasons people idle their car in Minnesota during the winter. One is completely unnecessary and the other could get you a ticket if done wrong.
Minnesota is served by two National Weather Service (NWS) offices: Duluth and Chanhassen (Twin Cities). These offices provide weather, water, and climate forecasts and warnings to the public, media, emergency services, and other agencies. Staffed 24/7 year-round, NWS meteorologists monitor statewide conditions, with additional support from the La Crosse, Wisconsin NWS office.