Winters in Diemen are cool and occasionally cold, with temperatures ranging from around -13°C in February to just above freezing in January and November. Spring brings mild temperatures, often reaching up to 24°C in March and April, but still experiencing chilly mornings. Summer is warm, with July being the warmest month, averaging around 18°C, while August is slightly cooler. Autumn sees a return of cooler temperatures, similar to those experienced during winter, with October and November averaging around 11°C. The coldest months are December, January, February, and November, while the warmest months are May, June, July, and September.