Isoline Map

http://www.examiner.com/slideshow/siberian-like-air-masses-invading-the-u-s#slide=57845256

This is an example of an Isoline map. The blue isolines convey numerical data for continuous distributions by joining points of equal value, in this case wind chill temperatures. Maps like this make me that much more thankful I live in Florida where -25 degree weather will never be a factor for me.