Didn't want to let this go unanswered.
Yes, my numbers most winters are similar to DCA. And the problem is that everyone jokes on how absurd DCAs numbers often are for some events. But a lot of times my numbers back them up. On marginal events the anecdotal and true numbers are horrific. The urban area around me hasn't changed drastically in the last 15-20 years so what is causing things to be terrible for areas just south of DC? You can't just blame EVERYTHING on elevation or lack thereof.
I have learned that there is/are microclimates all over the DMV. The same places that get deathbanded over and over even when radar says it should be snizzle. What I see happening more and more IMBY is:
Longer waits for precip to start(snow hole), lighter echoes where good precip dries up, earlier cut offs, and the biggest one is ease of warm layers both above and surface to punch into my neck of the woods.
We just don't radiate well anymore and that is a product of UHI. But for marginal events its lack of cooling AND warmer base state that screw many from seeing frozen. The base state is getting worse. I know a lot of data is now showing that its more where lows are just screaming warm the last few years. And its not just winter. Its all year long. Summer lows that are 70s-80s, fall/spring that stay warm. Everyone stares at high temps and scream thats proof of a warming but its really the lows. So when you just can't cool off like before then borderline events are already doomed for much of the S DC area.
I can say without a doubt that to get any sort of good event now you have to have temps in the 20s to start, slamming precip and a perfect track storm.