afaik past weather condition informations are available at daily granularity level.
if you're lost in docs, you should read at first at history data feature ( http://www.wunderground.com/weather/a... ), you have to cycle yourself the days you want using the format history_YYYYMMDD in building an api call.
the informations about wind that you can get from a history response I think are a little "cryptic" but decodeable, in metric and imperial units.
I'm not lost in docs, I know about history_YYYYMMDD but I don't need this. I need to get a range or 1 year data.(every day wind data or monthly), I don't want to make 365 calls to get this data .. this is very stupid