Otawara, Japan experiences a distinct seasonal pattern. Winter months (January and February) are cold, with temperatures ranging from below freezing to mild highs, averaging around 1-3°C. As spring arrives in March, temperatures rapidly rise, reaching average highs of around 9-12°C by April. Summer brings warm to hot conditions, with June and July averaging 21-25°C, while August is slightly cooler. Autumn sees a gradual cooling trend, with September and October experiencing mild temperatures before the onset of winter's chill in November and December.