It’s cold, but generally not consistently well below freezing unless there’s a significant cold front which is semi-random as to when it happens, but periods of 1-5 days of extreme cold happen a few times per year. Snow is similar, over the course of a few weeks, there’s a possibility 1-2 days of a significant snowfall, but more likely several days of light to moderate snow that makes cities a mess.

Pay attention to the weather forecast before leaving, if there’s a winter storm coming, expect 1-2 days of not doing much/delays. If it happens to fall on a travel day, you may need to adjust plans earlier or later. You probably won’t have to worry, but being prepared is important.