How windy is too windy?

[sundial]

If I didn't learn to ride in 20-30 mph winds- I'd have to stop riding altogether. That's all it ever does here in Oklahoma is blow, blow, blow... This has been a really windy winter, and I'm hoping it won't be as windy a summer.

Do you ride where there's little trees to block the wind? Where I cycle, there's nothing to block it and I duke it out with the crosswind and headwind. I can't figure out how I can have headwind both directions.