My ride to work this morning was quite normal. Only a slight breeze from the west of about 5kph. Total time was 35:57 for an average speed of 29kph.
Compare that to yesterday, when I had a 50-60kph headwind. Total time was 47:40 for an average speed of 21.9kph. I was working very hard just to keep my speedometer above 18kph on the hills. A relentless wind can really take it out of you.