Alkmaar's climate is mild and temperate, with temperatures gradually warming up as the year progresses. Winters are cool but not cold, with January and February averaging around 6-5°C, while December's average temperature is slightly lower at 8°C. Spring brings a steady rise in temperatures, reaching an average of 10°C by May and staying relatively warm through June and July. Autumn is mild as well, with September and August being the warmest months, but cooling down to around 14°C by October.