Katori's winters are chilly and variable, with temperatures often dropping below freezing in January and February, but also experiencing warmer days. As spring arrives in March, temperatures rise steadily, reaching averages of 12°C by the end of the month. Summer brings hot and humid conditions from June to August, with July being the warmest month, while autumn sees a gradual cooling off, with September still quite warm before dropping to more moderate temperatures. In winter, temperatures again fluctuate, but rarely dip below freezing for long periods.