Sangju experiences a significant seasonal variation in weather. Winters are harsh, with extremely cold temperatures plummeting as low as -23°C in January and lingering into February and December. As spring arrives in March, the temperature gradually rises, reaching averages around 8°C, but can suddenly spike to 30°C in April. Summers are warm to hot, with July being the hottest month, while autumn brings a slight cooling trend before temperatures drop again in winter. Overall, Sangju's climate is characterized by cold winters and mild summers, with spring and autumn serving as transitional periods.