Windrose

The above image, taken from http://www.wcc.nrcs.usda.gov/climate/fresno_apr.gif, is a windrose image for Fresno California. This graphic illustrates the winds experienced during the month of April in 1961. The wind tended to come from the northwest and west-northwest. This is indicated by the direction of the largest arms in the windrose. The wind speed with the highest frequency was 3.3 to 5.4 meters per second. This is indicated by the high percentage of the arms shown in red. In fact, the average speed for the month was 3.61 m/s, as indicated in the legend. From the information provided we also know that, while the windrose depicts the month of April for 1961, the image was actually crated on August 19, 2002 by Sara West.