Which one is colder, Ulaanbaatar or Harbin?

Ulaanbaatar.

According to weather network inquiries, the annual average temperature in Ulaanbaatar is -20.0℃--10.0℃, and the annual average temperature in Harbin is -0℃~11℃. Ulaanbaatar is located in the inland area of ​​Mongolia, with a cold climate and extremely low temperatures in winter. As a city in Northeast China, Harbin has severe cold winters, but the overall temperature is slightly higher than Ulaanbaatar. This is because Harbin is affected by warm currents and has a relatively mild climate. From a temperature perspective, Ulaanbaatar is colder than Harbin.