Here's a fun one - the last time that DCA (current airport location) had a consecutive week below freezing with at least 5" of snow on the ground was...never.
1989 had a longer streak, but less snow on the ground (2-4")
1979 had a similar streak, but some of the days had 4"
1961 had a 13 day stretch where it hit 33 twice (3-9")
It is wild to look at the snowpack from the side, especially adjacent to sidewalks. The sleet layer is forming a shelf as the snow melts/sublimates away. Still 5.5" here too.
Many people ask how you can live in the north with those cold temperatures. And you nailed the answer, you kind of just get used to it and dress appropriately.
7.2, second coldest of the winter. Airports were all around 10. I've been surprised in this stretch that IAD hasn't bottomed out like they normally do.
The temperature differences across the regions are getting wilder as we get later into the week.
Airports: DCA 13, IAD 6, BWI 8. Mine was 9.1 and most of northern VA looks to be in the 6-12 range. But MD is...cold.
The sidewalks are a disaster. My neighborhood has always been good about clearing them, but this storm was a complete breakdown. Kids walking to sledding locations have been walking in the streets. No way was school ever opening.
The NAM 3km is doing pretty well IMBY, but isn't cold enough in the low-lying areas. The HRRR is the inverse. The globals are having all sorts of problems. The fundamental answer is that the models just have so much trouble handling the very stable winter boundary layer and how much mixing there is.