Isoline Maps

 

http://mavdisk.mnsu.edu/larsop2/geog101/Tools/Tools.html

This is a isoline map and it presents the surface temperature across the U.S. on September 28th, 2005.  This is an isoline map because lines group areas with the same value. For example Florida is mostly red between 80-85 degrees and the map indicates that other areas like parts of Texas, Louisiana, and Arizona have the same value (Temperature).  The farther north from the equator the cooler the temperature would be and most of the isolines are horizontal across the states.