Flying in wind depends on the pilot mostly, and the plane to some extent.
Newbies are best advised to keep it under 5mph at first. The simple basics of up/down/right/left become entirely confused and too fast as the wind picks up. You need to have no hesitation AT ALL on how to react and do it instantly or you crash. If you still have to think about what to do and find yourself reacting to your plane instead of flying it where and how you want > you aren't ready for wind yet.
Of simply, if you have to ask, you aren't ready.