I've flown my Sea Duck in winds that others wouldn't fly in - 15-20 mph winds. That said, landing was hellish; I was nose in to the wind, trying to land, and had to go full throttle to get the plane to come forward enough to put it over the runway, and about 3/4 throttle to get it to land!
I would NOT recommend trying to fly in those conditions - while the wind may be steady from one direction, and you have no turbulence, trying to land, or even bring it back, might be incredibly difficult.