I am considering using calls to WeatherData for wind speed, precipitation, etc. It seems the data are accurate, and samples compare well with, for example, my local weather reports, however, I am wondering if using WeatherData time-history plots, summary statistics, etc. are defensible in a business context. As an example, when I plot directional wind speed data, for a given period and site, it compares reasonably well with other plots, however, there are differences of the order of +/-15%. Part of the difference may be due to Missing Data and spurious zeros (in my case I simply eliminate these data whereas others may be using schemes to clean the data.)
Do others have a view? Is WeatherData[ ] commercial grade information?