The temperature in De Bilt last rose this high on 9 September. Then it became 26.4 degrees. According to meteorologists, May 15 is a good date for the first day of summer. On average, this has happened on 14 May for the last thirty years, but last year, for example, it only happened on 1 June. The earliest summer day in De Bilt of the year was in 2007, on April 14.
The first official summer day in De Bilt comes right on time
