Stream monitors tend to sample streams very little during the winter -- if at all. It's not very pleasant, of course, sloshing through near freezing water and sitting in snow banks and counting bugs! Nonetheless, there is a lot to see in our streams from November through February, things that many monitors miss. Many mayflies, for example, make their appearance as very small nymphs in late November and/or December -- e.g. small minnow mayflies and spiny crawlers -- and they get bigger and bigger as the winter proceeds.
Large winter stoneflies molt numerous times as they mature. The photo below shows a Taeniopteryx nymph found in late November -- a "teenager," if you will. If you look closely, you can see the "coxal" gills in clear view behind each of the legs.