Dulmen's weather is characterized by mild temperatures with significant variation throughout the year. Winters are cool, with temperatures often below freezing in January and February, but can occasionally reach up to 19°C in February. Spring brings a gradual warming trend, with March and April temperatures averaging around 6°C, while summer is warm but not hot, with July and August averages hovering around 18°C. Autumn is also mild, with September and October temperatures similar to those of spring, before cooling down again in November and December. Overall, the temperature range is relatively narrow, with a maximum average temperature of 19°C in June and a minimum average temperature of -6°C in January.