My experience . . a nice steady 20 . . even 25mph is not too hard to deal with, if you are not near any significant obstacles . . anything more than grass. But if it's gusty . . like even 15 gusting 20-25mph then it's a serious risk if you are not on top of thing every second . . it will get blown around . . it will come back to it's original position and height given a few seconds to react in open spaces . . but if you and your controls are not well calibrated or you look away for more than a second or so, you may wish you hadn't taken off so near those trees or fence line. I had been carefully navigating some tree trunks towards open water 6 feet above the grass, with an on-shore wind of about 10-15mph . . .as I cresting the shoreline ( a 15 ft down slope to the water) it literally took-off . . UP and BACK . . in the gusty updraft possibly 20-25mph. Fortunately I was in SPORT mode and only full forward stick kept it below the branches long enough to clear them.
That got my attention . . and I was very glad I had re-calibrated the controls before that flight. Just the day before full forward stick had only given me a leisurely pace so I took the time to fix that right away.