I forget who it was exactly, but during the 2020-2021 winter someone ran the numbers on "snowless" mid-winter stretches at DCA and found that virtually every year in the modern era had at least one 30-45 day break between snowfalls. A few of the analog winters had even more prolific stretches, such as 2005-2006's 58 day break. I suppose that these types of breaks are more stressful in La Ninas because of how snowfall climo runs downhill as winter progresses, but the latter halves of 05-06, 17-18, and even last winter show that this is not always the case.