Dashboard nothing works in it

This is now the third summer that I have had this problem. I have a 99 plymouth breeze. It's been a great car. Always taken it to the garage for all its needs. Here is my problem. When its hot weather all the gages in the dash don't work. This makes me nervous as I don't even know how fast I am going. Today was an extremely hot day and everytime I got in my car, nothing in the dash worked. I sure would appreciate any input on this.