I'm not sure of the speed, but we have tall trees all around our house which block the wind somewhat. A few days ago I took off and climbed above tree level and evidently hit strong winds aloft and suddenly my drone was flying away. I pulled the stick all the way back and I assume I was in wind roughly the same speed as the top speed of the drone, because I was alternately at a dead standstill, moving away slowly, and then moving slowly back towards home. I thought I might lose the drone. Then I descended slowly about 20 feet and I was partly out of the wind, and got her home. Lesson learned, I won't fly again when the treetops are swaying.