An isohyet is a line joining points of equal precipitation on a map. A map with isohyets is called an isohyetal map. This map compares the average amount of rainfall from an area around Mountpilliar, France from 1851-1900 to 1959-1994. It shows that the area that usually receives smaller amounts of rainfall has expanded greatly in the later years.
http://melody.cefe.cnrs.fr/meteor.gif
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