There were several cold shots this past January that were certainly solid cold days but I'm convinced they would have been more impressive just several years ago. DCA is another story all together but now even BWI has trouble staying below freezing during the day even when there is a decent mid winter cold front.
There are way too many days that bust warm now. A sunny winter day forecasted to be in the mid 40's ends up in the low 50's up here. On the other side it seems there are almost no days that bust too low anymore.