Ultimately I believe it will need a new instrument cluster. Sorry if there are those out there who would suggest a repair.
If you are good enough at electronics to repair it, I assume you wouldn't even be asking though. This isn't meant as a "slam", I would replace it if it were my car also.
Unless you want to wait for warmer temps and see if the LCD's are all operative then. You can have problems with these in cold weather (inop pixels or flickering). At that point you can decide to just put up with the problems if it's only in cold weather, or to move towards a new cluster. Any warranty left?