As winter biking is starting to become far more common than it used to be they need their separate category from normal biking. Problem with segments is that some fairly rough segments become as smooth as asfalt in the winter time. So any such segment just becomes a winter segment as you can't match speeds in the dry season.
One idea is to use weather service data to determine when there was a snow cover of certain depth and thus marks for a snow/winter biking ride. For example first time depth hits 20cm snow cover you have snow biking for the rest of the winter. The snow cover compresses after that so depths below 20cm late winter will still cover any small to medium terrain shapes. 20cm is roughly what you need to start covering the features of a trail.
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