Yanji's winters are bitterly cold, with temperatures often dropping below -20°C in January and February. Spring arrives slowly, with March being a chilly month, averaging around 5°C. Summer is warm but not sweltering, with July highs reaching the mid-20s Celsius. Autumn brings mild temperatures, with September averaging around 10°C. The cold returns in winter, with December temperatures sometimes plummeting below -15°C.