I agree with what's above. I was told if you want to fly in Vermont, you have to fly in wind, and it's been true nearly every time I'm out flying, at least for part of the session.
Today was my first real crash, and it was because the wind really picked up, so I was trying to practice. It was just over 15mph, straight across the runway. I used some rudder about 15 feet altitude and went into a stall due to lack of power (got to keep some throttle in the wind, Joe!) Point of the story is that 10mph down the runway is actually a help. I think probably over 20mph would keep (most) people out of the air here in Vermont, but we've regularly been flying in the 15mph range since last week. Oh yeah, the toughest part is when the wind is changing directions. It's happened a couple of times in the past week where you take off facing one way, and land coming back the other, with everything in between. You start to compensate for the wind, then it changes, keeping you on your toes. The hardest part for me right now is my plane weathervaining into the wind on the runway, usually just after touch down as the plane slows down, but is still going fast enough to require some serious reflexes! Watch out!