On Jan 19th, 1994 MDT's high temp for the day was -1...meaning it stayed below 0 all day. Dec wise, the lowest high temp at MDT is in 1917 when it only got to 5,7 and 8 for highs over a span of 3 days of Dec 29, 30 and 21. I do wonder if it gets to 0 at LNS before midnight, would the 57 degree 12-hour drop be a record?
The record high for tomorrow/ Christmas Eve is 15 and that may be in trouble as could the record low of -1 possibly be broken.