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No sorry, this is not normal.
The display should come on straight away.
It is quite common for the backlight to fail on thecontrol panels, but I haven't heard of many displays actually failing. Although it could be a similar problem with dry joints on the display board.
The outside temp sensor is located underneath the passenger side mirror ( on UK cars) and yes it is linked to the climate control. The air con does not come on if outside temp is less than 5 degrees and also the heated screen is automatically switched on if outside temp is less than 5 degrees.
The sensors can be replaced, they can even be bought just as cheaply from a dealer as from
If you do a search on here there are instructions for repairing the backlight and I think changing the outside temp sensor.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.