Boxing Day, 2010! What an amaz....oh, wait a minute! No, that storm sucked for us and is verboten to mention, like Lord Voldemort, the Storm which Shall Not Be Named!!
But seriously, it's tough to pinpoint an absolute favorite so I'll list a few, or at least a few time periods. Chronological order, not in order of preference:
--PD-II, 2003. I was living in the Capitol Hill neighborhood and the lead up to that was very exciting! I had only moved here in July 2001 and winter '01-02 completely sucked (my first winter here), so '02-03 was a nice change! I remember the guidance kept trending colder and lots of precipitation. I was expecting most of it to start on that Sunday morning (Feb. 16, 2003), but when I got up there was already 6" on the ground and pounding snow. We did get sleet of course much later on but still got ~18" where I was. Amazing storm, and cold throughout.
--February 2007. I know a lot of people tend to blow off or overlook that winter, but that February was very cold and if we had gotten snow rather than sleet/ice for the Valentine's Day event, I think it would be one of the better winters. And we got the somewhat unexpected 5-6" of wet snow later in February (I think the 25th). That season actually was awful in December and early January...but mid-January through February was pretty cool and active. I actually liked that winter overall.
--The entire 2 week period from Jan. 30-Feb. 10, 2010. Even having grown up in northeast OH and having experienced many big winters, that 2 week period here in 2010 was about the snowiest and most incredible that I've seen. Where I was in Silver Spring at the time, I received 6.3" on Jan. 30, 5.0" on Feb. 2, 23.5" on Feb. 5-6, and 12.0" on Feb. 9-10. I recall going to bed on Feb. 9 after some snow and there was freezing rain falling by then, thinking we were in for a huge bust. Woke up on the 10th to whiteout and blizzard conditions that continued through the day. And of course, you cannot mention that winter 2009-10 without also mentioning the 1st HECS of that season on Dec. 18-19, 2009 (20.0" where I am)...oh, and of course, happy anniversary to @mappy every year on Dec. 19!!
--Winter 2013-14. Damn near wall-to-wall with tracking events. Not a single HECS, but loaded with several moderate events. Hell, even @Bob Chill said he was exhausted by the end of March! Plus it was the 2nd year in a row that snow fell on my birthday on March 25 (happened in 2013 as well).
--3 weeks from mid-February to early March 2015. Holy cow what a ride! Yeah, a late bloomer of a season but another extremely cold February (colder than 2007!) and this time we cashed in on some good snows. March had an ice event the first weekend of the month and then a nifty moderate event on the 5th. February 14 also had what is perhaps my favorite "minor" event, a couple of snow squalls with an Arctic front dropped 2" in less than an hour, followed by bitter cold and wind which ushered in that amazing 3 week period!
--January 22-23, 2016. What can you say? The blizzard of 2016 HECS! That storm was so well forecast and just a classic setup. I remember sitting in a coffee shop the Saturday a week before looking at AmWx, and after the 12Z models came in everyone KNEW a big event was all but guaranteed, it was just a matter of the details. A few days prior to that was a small clipper that dropped an inch of dry snow that resulted in icy roads. I know a lot of people love to hate on that winter saying it was a one and done season...but what a ONE! And that was after ridiculously warm (+10 degree departure) December. We also did get a small snow and ice event around mid-February that year, which tends to get overlooked.
--January 11-12, 2019. I know this may have affected the DC area more, but it was a neat event that dropped 11"!! I recall LWX going kind of big on the snow amounts which seemed risky at the time, but that turned out to be correct.
[But, my all-time favorite event from anywhere I lived was the great Ohio Blizzard of Jan. 26-27, 1978!!! No, it was not a prolific snow producer in northeast OH (maybe 6-12" overall). However, that storm was so damned severe it's hard to top. It set low pressure records from the southeast US to Canada, including 28.28" (957 mb) as the center of the storm passed right over Cleveland. Temperatures dropping 30 degrees in a 2 hour period (from mid-40s at 4AM to the teens by 6AM), then single digits most of the remainder of the day on the 26th with whiteout conditions. Wind gusts to 80+ MPH and unreal low wind chills. They were literally telling people to NOT go outside. We still had about a foot of old, crusty snow on the ground and the drifts that resulted from the blizzard were quite incredible. I remember Dick Goddard, the local meteorologist (and a very good forecaster) saying that for the only time in his long career, he told people on the 11PM news show to not expect to travel anywhere the next day, even though at that time it was still pretty mild and kind of drizzly out. The Ohio Turnpike (I-80/90) was closed from gate to gate for the only time ever. The National Guard had to be called in for relief efforts after the storm. That winter, 1977-78, was the second incredible one after the brutal and record-setting cold winter the year before in 1976-77.]