Isopleth

This Isopleth map shows rainfall from 1961-1990. This map was created by the Oregon Climate Service at Oregon State University.
http://images.google.com/imgres?imgurl=http://www.krisweb.com/kristenmile/krisdb/html/krisweb/maps/ten_rain_map.gif&imgrefurl=http://www.krisweb.com/kristenmile/krisdb/html/krisweb/maps/geomap_ten.htm&usg=__ok010IRPntvEVMV0O7lZXD8oJTU=&h=630&w=1022&sz=113&hl=en&start=2&um=1&tbnid=PGw2rhbstnSrWM:&tbnh=92&tbnw=150&prev=/images%3Fq%3Disopleth%2Brain%2Bmap%26um%3D1%26hl%3Den%26rls%3DSUNA,SUNA:2006-04,SUNA:en