5. Make sure you have a right tire
Make sure that your tire has a good grip and puncture resistant. You could get more punctures in the winter due to the ice rain. If it turns into ice, you can also slip easier than in summer. Therefore, check your tire before you go through the cold or the rain.
6. Check on the rain radar. Usually, it is pretty accurate
Check on rain prediction in the Netherlands is pretty accurate. So if you want to avoid to get cold and wet, then you can check these websites. They usually can predict when the rain will stop and you only have to cycle through the cold.
7. The harder it is, the faster it went.
It is a rule of thumb in the Netherlands is that when it is raining very hard, it means that the rain will stop quickly. When it is drizzling, then it might stay the whole day. So if you see that it will rain hard that day. Better wait a bit and then cycle when the rain intensity is not that high.
Those are some tips that we have to help you to cycle in the cold. Let us know if you have more suggestions or if we miss anything. Good luck and keep on cycling!
Fun fact: based on the website hetregenbijnanooit by Gerard Poels from Grave, Nijmegen, the total percentage of his wet day is around 9.7% after 11 years of measurement. So The Netherlands is not that wet after all, just cold and windy, I guess.