With an average temperature of 11.7°C, the autumn of 2025 was very mild, although the season only ranked 7th in the list of mildest autumn seasons.
September started with a summery week; on 7 September, 30.7°C was recorded in Westdorpe. A day later, the heat was driven away, followed by occasional rain and wind. In the third week of September, summer briefly returned, ending with thunderstorms. Afterwards, it became significantly cooler, with temperatures dropping sharply at night.
In October, we welcomed the first storm of the season: Storm Amy passed over the northern North Sea, bringing strong winds and precipitation to our region. Daytime temperatures were around the long-term average of 16-17°C. At night, it was milder at 10°C. Mid-month, it became much wetter. Storm Benjamin crossed the country on 23 October, and afterwards, the weather remained changeable with much wind and rain.
Two Faces
November had two faces this year. The first half of the month was often sunny, dry, and especially mild with maximum temperatures between 14 and 18°C. The second half became cold, with frost and fog banks. On 22 November, the lowest temperature of the month was recorded in Eelde: -5.4°C. There were many showers, sometimes with hail, thunderstorms, and wet snow; some places even saw a brief white covering. The autumn ended gloomy, drizzly, and mild.
This autumn, De Bilt recorded 15 warm days (maximum temperature 20°C or higher), all in September. On 16 November, the temperature dropped below freezing for the first time this autumn (and this winter half-year). November ended with 8 frost days in De Bilt, three more than normal. The northwest had fewer frost days, and Vlissingen did not experience any frost at all.
Quite Wet
On average across the country, the autumn was quite wet overall, with 252 millimeters of precipitation compared to a climatological average of 220 millimeters. This was mainly due to the very wet month of October, with a national average of 116 millimeters of precipitation against 75 millimeters normally. As in the past summer, the southwest received much less precipitation than the north. There, the autumn had 160-200 millimeters, about 30 millimeters drier than normal. Eindhoven was the driest automatic KNMI station with 158 millimeters.
Sunny in September, Gloomy in October
With a total of 351 hours of sunshine, this autumn was textbook (normal 349 hours of sunshine). Looking at the months separately, September had a large share of sunshine hours, namely 188 hours, while the normal for September is 159. October was gloomy with only 87 hours of sunshine compared to the normal 120 hours. November behaved as expected.
