Somewhere I have a picture of my ignition lock covered in ice from a freakishly cold day last year, the only thing inside the car that was. It's a 123 but I bet the scenario is the same-- it's a large chunk of metal that will attract any stray moisture in the car when it gets cold.

The only thing you might view it as is a symptom of a leaky seal or drain somewhere letting a trickle of rain in to provide said stray moisture.