Nagano's winters are cold, with temperatures often below freezing and averaging around 0°C in January. Spring arrives in March, bringing warmer temperatures that steadily rise throughout the month, eventually peaking at an average of 10°C by April. Summers are warm to hot, with July and August seeing average highs around 24°C, although temperatures can occasionally soar above 35°C. Autumn brings a return to cooler weather, with September experiencing mild temperatures before dropping to near-freezing in November. The coldest months are December and January, while the warmest months are June, July, and August.