Nagareyama's winters are quite chilly, with temperatures often dropping below freezing in January and December, but averaging around 4-6°C. As spring arrives in March, temperatures rise steadily, reaching an average of 12°C by the end of the month, with April and May bringing even warmer weather, often surpassing 20°C. Summer months from June to August are hot and humid, with temperatures frequently hitting over 30°C, especially in July and August. Autumn brings a welcome respite from the heat, with temperatures gradually cooling down in September and October, but still relatively mild. By November, temperatures begin to drop again, returning to cooler winter averages by December.