White Dew, is the 15th solar term in the "Twenty-Four Solar Terms" and the third solar term in autumn. When it comes to White Dew, the summer monsoon is gradually replaced by the winter monsoon. In addition, the point of direct sunlight moves southward, the sunshine time in the northern hemisphere becomes shorter, the light intensity weakens, and the ground radiates heat faster, so the temperature drop speed gradually accelerates, and the temperature difference between day and night gradually widened. White Dew has basically ended the sweltering heat of the summer, the weather is gradually getting cooler, and autumn is beginning to enter in various places.