Ulsan's winters are cold and unpredictable, with temperatures fluctuating between -14°C in January and 17°C, often averaging around 1°C. Spring brings mild temperatures, gradually warming up from an average of 10°C in March to a high of 29°C in April. Summers are hot and humid, with temperatures frequently reaching highs above 30°C, peaking at 37°C in July and August. Autumn is characterized by cooler temperatures, but still warm enough for comfortable outdoor activities, before dropping back down to chilly winter conditions.