I think this is a very good question, but I've never seen such data. I often hear it said that winter tires are better than all seasons in dry conditions below ~41-45F/5-7C, but I'm not sure if I believe it is at that temperature. That said winter tires have improved a lot for dry conditions in the last ~10-15 years. Similar things have been said of all season vs. summers. Again, I'm sure there is a point where the all seasons are better, but I'm not sure that it's at 45F. This isn't the same use case, but I know 200TW tires still have very significant grip on the track at those temperatures.
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