2025 ranks as sixth warmest year on record in the Netherlands

The year 2025 is set to be the sixth warmest on record in the Netherlands, with an average temperature of 11.5 degrees Celsius measured in De Bilt, the site of the country’s official weather station, well above the long-term average of 10.7 degrees, according to a press release from the weather service Weeronline. The warmest years on record were 2023 and 2024 at 11.8 degrees, followed by 2022, 2019, and 2018.

The year recorded 112 “warm” days with temperatures above 20 degrees, 35 “summer” days over 25 degrees, and eight “tropical” days exceeding 30 degrees. Two official heat waves were logged, in June and August — a rare occurrence previously only seen in 1941, 2006, 2018, and 2019.

July 1 marked a “very hot” day in De Bilt at 35.5 degrees, part of a nationwide heat wave that saw Maastricht reach 39.0 degrees on July 2, the fifth-highest temperature ever recorded in the country.

The year also set a new record for the number of “mild” days, with 207 days reaching at least 15 degrees, surpassing the previous record of 206 days set in 2022 and 2014.

In contrast, 2025 had slightly fewer frost days than normal, with 47 nights dropping below 0 degrees compared with an average of 51. Two official ice days were recorded in De Bilt, ending a 762-day stretch without ice days, the longest on record.

Several months were significantly warmer than usual. April averaged 11.5 degrees compared with a 9.8-degree norm, June ranked as the second-warmest June ever at 18.3 degrees, and October through December were also warmer than average. The year produced 12 daily high-temperature records but no daily cold-temperature records.