The start of Chushu, or End of Heat, occurs annually from August 22 to 24, when the sun reaches the celestial longitude of 150 degrees. Chushu signifies the departure of heat, marking the end or near end of the dog days of summer.
Meteorological conditions
As Chushu arrives, we have reached the final phase of the high-temperature heat, indicating that the unbearable hot weather is coming to an end. Although the weather remains hot during this time, it is on a downward trend. However, the retreat of heat is a gradual process; it doesn't become immediately cool. The true onset of cooler temperatures typically occurs after the Bailu, or White Dew, period.
After Chushu, the sun's direct rays continue to move southward, resulting in reduced solar radiation. The subtropical high pressure also withdraws southward, leading to a gradual dissipating of heat. Thunderstorm activity is less vigorous than in the height of summer, and the overall trend of heavy rainfall across the country decreases.
Cultural significance
Around Chushu, there are folk activities celebrating the Zhongyuan Festival, also commonly known as "July Half". One important tradition is releasing river lanterns, also called "lotus lanterns", which consist of lanterns or candles placed on a base and floated in rivers, lakes, or seas on the night of Zhongyuan Festival. This act expresses remembrance for departed loved ones and blessings for friends and family.
The arrival of Chushu signifies a gradual transition from the hot summer to cooler autumn. The temperature difference increases, with warm days and cool nights. During this time, it's advisable to follow the principle of nourishing the lungs and strengthening the spleen, consuming foods that are cooling, moistening, and nourishing. There is a custom of eating duck during Chushu, as ducks raised in mid-July are considered the most flavorful and nutritious, believed to replenish yin, enrich blood, and clear heat.
Chushu coincides with the harvest season, and farmers often pay homage to the God of Land on this day, hoping for favorable weather and abundant crops.
