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Cold Dew (Hanlu) is the 17th solar term within the traditional 24-term Chinese calendar and the fifth term of autumn. It commences between October 7 and 9 on the Gregorian calendar, when the Sun reaches the celestial longitude of 195°. This period marks a transition where the morning dew, once merely cool during the White Dew season, turns cold, signaling the deepening of late autumn.

The Essence of "Cold Dew"

The name "Cold Dew" is derived from the ancient Chinese practice of observing subtle natural phenomena. A traditional folk saying, "Dew is first white, then cold," describes how the morning dew evolves from glistening droplets in early autumn to a state verging on frost, hinting at the impending winter. This poetic imagery of "white dew aspiring to become frost" vividly captures both the steady decline in temperature and a fundamental seasonal shift.

A Time of Transformation
With the arrival of Cold Dew, the summer heat recedes entirely, and the character of autumn becomes unmistakable. In the night sky, the star Antares (Da Huo Xing), which symbolizes the height of summer, is seen descending below the western horizon. The sun's arc lowers, daylight shortens, and a deeper chill permeates the air. The diurnal temperature variation becomes significantly more pronounced. This season is characterized by distinct natural phenomena: wild geese migrate south in formation, common songbirds vanish from sight, and chrysanthemums come into full bloom. Cold Dew thus serves as nature's gentle reminder that we are now in the heart of autumn—a time to seek warmth, embrace tranquility, and reflect upon the year's harvest.