Windrose - Maine

http://www.maine.gov/dep/air/meteorology/Windrosehome.html

Windroses are specifically useful to meteorologists because they show the distribution of speed and direction of winds for a specific area.  The concentric circles moving outward from the center denote increasing frequency of winds from that specific direction.

The windrose shown above is for a location within Maine.  From this windrose we can see the the greatest frequency of winds occurs out of the northwest.  Wind directions also seem to favor the West on average than the East and Southeast.