Originally Posted by
spivonious
The strongest headwind I've ridden into was about 25mph, but
the worst wind I've ridden in was 50mph crosswind gusts. Nothing like riding straight and then being pushed a few feet into traffic. 
We had the same experience riding eastward the first day out from the Grand Canyon. Also on that West-to East cross country trip, we hardly needed to pedal with a tailwind on a freeway near San Bernardino, CA.