Hachioji's winters are bitterly cold, with temperatures often dropping below freezing and averaging around -1°C. The coldest month is usually January, with a record low of -31°C. Spring brings mild temperatures, gradually warming up from March to May, with April being the warmest month so far, averaging 8°C. Summer months, particularly July and August, are hot and humid, with temperatures frequently reaching above 30°C. Autumn cools down rapidly in October, bringing temperatures back within a few degrees of freezing by November.