While not 2015 levels of warmth, 60*F is beginning to look achievable for DC and close in suburbs for xmas eve / day.
Depressing as this is, most recent examples here do roll forward to a somewhat pronounced and sustained flip into January. Unfortunately, it also sets the stage once again (similar to 2021-22) when the xmas holiday period and memorial day holiday weekend to see legitamately inverted absolute temperature values. Meaning, the average high at the lowest sun period of the year exceeding the average high for nearly the highest sun period of the entire year, for some meaningful period of time.