Saturday marks the first official warm day of the year. At the main weather station in De Bilt it was 20.1 degrees on Saturday at 12.30 p.m., which is a little early. On average, it is only 20 degrees or more in De Bilt on April 13.It is even warmer in other parts of the country. In Eindhoven, for instance, it is 21.6 degrees and in Enschede 22.4 degrees. In general, it is only an official warm day when the temperature reaches 20 degrees or more at the weather station in De Bilt. Read this story
