Winters in Ishioka are cold, with temperatures often below freezing and averaging around 5°C in January. Spring brings mild conditions, with temperatures rising steadily through March and April, reaching averages of 12°C and 14°C respectively. Summers are warm to hot, with July and August being the warmest months, averaging highs above 25°C. Autumn is a transition period, with temperatures gradually cooling from September's average high of 22°C to October's average low of 4°C, before warming up again in November. The temperature fluctuations throughout the year result in distinct seasons with clear transitions between them.