Shibukawa's winters are chilly, with temperatures often dipping below freezing and averaging around 4°C in January. As spring approaches, the mercury rises steadily, with March bringing mild days and nights as warm as 24°C on average. Summer is hot and humid, with July being the warmest month, averaging a high of 26°C, while autumn brings relief from the heat, with temperatures gradually cooling back down to around 12°C by November. The coldest months are January and December, when temperatures can drop below -6°C overnight. Overnight lows in June and September are relatively mild, ranging from 16°C to 19°C.