Which is colder, Dengfeng City in Henan Province or Changchun City in Jilin Province? What is the difference?

I come from Changchun. The lowest temperature in Changchun in winter should be MINUS 30 degrees or lower, but it usually won't take long to reach such a temperature. Generally, when it is coldest, it will be maintained within the range of the highest temperature minus 15 degrees during the day and the lowest temperature minus 25 degrees at night. This temperature range generally lasts about 45 days, generally from 65438+ in February of the current year to early February of the following year. But this is not the case. It may be a few days earlier, a few days later, or it may be a little warmer during this time. As for the temperature in Dengfeng, Henan, I have probably checked, and it should be 15 degrees higher than that in Changchun.