Overview
- In De Bilt the temperature reached 13.1 °C, setting a new record for December 9 and surpassing the 1964 mark of 13.0 °C.
- Horst measured 14.3 °C, establishing a new national high for this calendar date and topping the previous 1964 record of 14.2 °C.
- The exceptional spell follows record values on December 7, including 14.0 °C in De Bilt and 14.3 °C in Herwijnen and Hupsel, with regional stations such as Rotterdam The Hague Airport also setting date records.
- Daytime highs are running around 13–14 °C with nights often near 10–11 °C, and Wednesday could challenge additional records before a modest cooldown to 10–12 °C later in the week.
- Wageningen University biologist Arnold van Vliet warns of an extremely early pollen season and stresses on insects and amphibians linked to the prolonged mild conditions.