What about all-time highs for the month of January? (Thanks to the NWS office in Bismark, ND for this information)

BISMARCK.... 63 ON JANUARY 08 2002.
DICKINSON... 63 ON JANUARY 23 1981.
JAMESTOWN... 56 ON JANUARY 19 1908.
MINOT....... 59 ON JANUARY 28 1906. (60 so far)
WILLISTON... 55 ON JANUARY 23 1944.

Record Highs so far today:

Rapid City, ND: 70 degrees so far, broke the old record (2008) by 10 degrees

Minot, ND: 60 degrees is the record high for the month of January! The old record was 59 set back in 1906. (See list above)

Aberdeen, SD: 58 so far, old record was 46 set back in 1935