When does the Heihe River start to get cold?

Heihe River generally starts to get cold in 10.

Cold dew is the seventeenth solar term in the twenty-four solar terms, and it is also the first solar term with "cold" in the twenty-four solar terms, which lasts for 7-9 days in the solar calendar every year. "Twenty-four solar terms" said: "In September, the dew is cold and will condense." It means that the temperature of the cold dew solar term is lower than that of the white dew, and the dew on the ground is colder and will soon condense into frost.