Winters in Muskegon are cold and snowy, with temperatures often below freezing, averaging around -5°C in February, the coldest month. Spring arrives slowly, with March temperatures gradually warming up, but still experiencing occasional frosts. Summer is mild to warm, with July and August being the warmest months, averaging 22-23°C, while September brings a slight cooldown. Autumn is similar to spring, with October and November temperatures fluctuating around average highs of 14°C. During winter, December's temperatures are consistently cold, often below -5°C, while the rest of the year sees more variability.