Well, the highest wind I've flown my Corona in is wind gusts to 30 km/h, approx. 20 mph.. Challenging but fun..

Luckily, I had my wife with me and have a video of the flight [link=http://www.cybertool.org/corona/corona.wmv]here[/link]. There was less wind at the beginning of the video. You can also see the Corona fighting the wind and pitching up in the middle portion of the video.. Wind gusts were high enough that I was having problems getting any head way..