Why is Qujing colder than Hunan?

Because the altitude of Qujing is higher than that of Hunan. The reason why the weather in Qujing is colder than that in Hunan is that the altitude in Qujing is higher than that in Hunan, and the atmospheric heat preservation in areas with high altitude is poor, which leads to more heat loss and colder. The average altitude of Qujing is 2000 meters, and that of Hunan is above 1000 meters, which will make the weather in Qujing colder than that in Hunan.