http://images.google.com/imgres?imgurl=http://www.epa.gov/asmdnerl/Library/AnnualReports/2003/fig21.gif&imgrefurl=http://www.epa.gov/AMD/Library/AnnualReports/2003.html&h=381&w=350&sz=37&hl=en&start=6&um=1&tbnid=PhqjQxbqXcDXcM:&tbnh=123&tbnw=113&prev=/images%3Fq%3Dwindrose%2Bmap%26um%3D1%26hl%3Den%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7SUNA%26sa%3DNA windrose plot is a circular graph with each spoke broken down into color-coded bands that show wind speed ranges. They also use cardinal directions to show what speed wind was in what direction.
This map shows winds average over the period September 11-13, 2001 for the NYC area (coming from the west).
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