I looked for the answer to my question in my owners manual, but could not find it. Here in Florida we had a small cold front come through last week. I was driving along when the outside tempeture shown in the MFD reached 39 degrees. The MFD made the ding sound and I noticed that the tempeture shown in the MFD was flashing and than there was a snowflake symbol displayed to the left of the tempeture display. The snowflake symbol stayed displayed until the tempeture reading displayed 42 degrees, or at least that is when I noticed that it was gone from the MFD display. I could not find anything relating to this in my owners manual? :dunno