So far, this February has been the second coldest on record in North Dakota, with afternoon maximums averaging 3F (-16C.) The frequency of nights below 0F (-18C) has been the highest.
Lots more record cold in the forecast.
10-Day Temperature Outlook for the Conterminous U.S.
The coldest February was 1936, which had similar weather patterns – except for southwest which was mild that year.
ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/mwr/064/mwr-064-02-c1.pdf
