IJmuiden's climate is characterized by moderate temperatures throughout the year, with winters being cool and summers mild. The coldest months are January and February, with average temperatures ranging from 5-6°C, while December is slightly warmer. Spring brings gradual warming, with March and April temperatures averaging around 6°C. Summers are pleasant, with June to August averages consistently above 15°C, peaking at 17°C in July and August. Autumn sees a return to cooler temperatures, with October and November averaging around 11-14°C.