Which winter is colder in Lhasa or Lanzhou?

Lhasa. The average winter temperature in Lhasa is -7.0℃-9.0℃, and the average winter temperature in Lanzhou is -7.0℃-4.0℃, so Lhasa is colder in winter. Lhasa is located at a high altitude, the solar radiation is small, the air is thin, and the thermal insulation effect is weak, so it is cold in winter. Lanzhou belongs to the plateau basin, with a lower altitude than Lhasa, so the average temperature is also lower.