Wind Direction GGPlot2

#Download data from http://www.met.ie/climate-request/
# select the ddhm and the date columns.
data =read.csv("Dub2014.csv", header=TRUE)
newdata <- na.omit(data)

  ggplot(aes(ddhm)) +                            
    geom_histogram(binwidth = 10, colour = "blue")+
    theme_minimal() +
   coord_polar(start = 0) +
    scale_fill_brewer()  +  ylab("Wind Direction")+  xlab("ddhm: -   Mean Wind Direction")+
      scale_y_continuous(breaks = NULL) +
       scale_x_continuous(expand = c(0, 0), 
                           breaks = c(360,80,180,280),
                           labels = c("North", "East", "South", "West"))+
 ggtitle("Wind Direction Dublin Airport")
 
ggsave("DublinWind.png")