I once was riding directly into a strong headwind on a flat road with no trees or even tall corn to block the wind. I kept shifting down in an attempt to keep the RPMs up. I finally ran out of gears and I had a 30x27 triple setup! A few miles more I gave up and turned around to enjoy the tailwind back to the start.

Later I checked the weather reports and there were 40+ mph winds with guts into the 50s.

Thankfully there wasn't much in the way of crosswinds.