Best weather in Holland is generally May-September
Weather conditions can change rapidly and dramatically in the Netherlands so always carry warm/cool and wet gear with you on your Dutch trip.
Worst: Winters are cool, December-February, but when winds start to whistle across the flatlands, the chill factor freezes your blood and bicycles are not on the menu du jour – a warm, dry taxi will do nicely. However, if you’re visiting for purely urban life and wrap up well then winter can be interesting and is naturally less touristy.
Spring and Autumn involve a lot of rain so grey skies sometimes seem to be Holland’s default setting.
Keukenhof Gardens in springtime, near Amsterdam.