Thanks for the report. I have always figured that riding in the Netherlands was likely to involve headwinds. Too bad about the temperatures, I have been unhappy that ours have been a little low, but we haven't seen freezing temps for over a month. Looks like the temperatures for next week's 600k are going to be fairly reasonable, which is good for me because if it was going to be hot I would have cramping problems this time of year.
I was watching the tracks from the pre-ride of the 600k. As it got dark, they started getting rained on, and it got down to 42F. That was too much, and they ubered home at about the 200 mile mark. I might ride my gravel bike, reports were that there were some long soft sections of a bike trail. So bigger tires will probably be faster.