Coldest Christmas Day on record in Balto. Zero for the min and 12f for the lomax.
Reloaded a month later and IAD recorded lowest temp ever at -18f on 1/22/84 . I believe we had -12f in HoCo, but I'm going by memory, I've lost the written record from those days (I think).
ETA: OK, now that you've made me dust off the record book (Balto)....I see that hot Sept 1983 set 5 record high max days: the 6, 10, 11, 19, and 20th. The 11th was hottest at 100f. No other year set so many record temps in the month.