Okegawa experiences a temperate climate with distinct seasonal variations. Winters are cold and snowy, with temperatures often below freezing from January to March, but mild in February. As spring approaches, temperatures rise rapidly, reaching as high as 26°C by April and 31°C by May. Summers are hot and humid, with temperatures frequently exceeding 35°C from June to August, while autumn brings a welcome cooling, with temperatures dropping back down to around 10-20°C by November. The coldest months of the year are January and December, when temperatures can drop as low as -7°C.