Pa. USA, graphs, graphics, pictures, are copyrighted and are owned by the author. Charles A. Giannetta. A transition zone between two air masses of different densities.
Density is controlled by the temperature and humidity of the air.
Cold Fronts 1. This means that 80 miles into the surface position of the front, the frontal boundary is about 1 mile above the ground. Cold Fronts usually move faster in winter than summer. The average speed of a Cold Front is about 30 mph. Choose here to view graphic of cold fronts.