Threat of frost, unseasonable cold continues for Northern MN

Another set of frost advisories were put into effect from 1 a.m. through 9-10 a.m. Saturday, Sept. 6, for portions of northern Minnesota.

Temperatures as low as 32-33 degrees may result in frost formation, which can harm or kill sensitive outdoor plants if they're left uncovered.

The National Weather Service offices in Duluth and Grand Forks issued the advisories Friday afternoon. The areas affected include Lake of the Woods, Beltrami, east Marshall, east Polk, north Clearwater, Pennington, Red Lake, Roseau, Koochiching, north Itasca, central and north St. Louis, north Cook and north Lake counties.

Also included are the tribal lands of the Bois Forte Band, Nett Lake, Lake Vermilion and Deer Creek areas. Voyageurs National Park and the entire Boundary Waters Canoe Area Wilderness are also included.

There's also a danger of frost overnight Saturday into Sunday morning and Sunday into Monday morning, with temperatures expected to dip similarly into the low 30s. Temperatures are expected to return to normal by Monday.

Record cold high temperatures were set in Hibbing and Brainerd on Thursday, Sept. 4. The weather service in Duluth reported that in Hibbing, the high was 50 degrees, which breaks the record of 54 degrees set in 1962. In Brainerd, the high was 52 degrees, which breaks the record of 53 set in 1935 and 1926.

Temps were even colder in Grand Forks, North Dakota. The high was 48 degrees on Thursday, which shattered the coldest high previously recorded of 55 in 1956. It's also the earliest high below 50 degrees recorded in the fall months of September and October.