the center display is based on florescent technology, a bit like florescent tubes you get in the kitchen or garage, it doesn't like the cold, so will be dim when its cold, and warm up as the cabin warms up as well as warming up itself. This is just a design thing, I used to have an A6 that had an LED based display and never had an issue with it, apart from pixels and lines failing.
The only thing that could be done to stop it, would be put a heater behind it that brought it upto temperature quickly when cold, maybe the new cars have that. Either way as the florescent gets old, it will be more affected by the cold.
W
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8 - 4.2 - 2002 - LWB
4 - 2.5 - 2004 - CVT - B6
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