What are the initial cooling period, severe cold period and final cooling period of central heating?

For example, the heating days in Shenyang are 15 1 day, from 10 in October to 3 1 in March of the following year. According to experience, we generally manage the initial heating period, namely 1 1 and 65438+. From the end of February to the beginning of February, the outdoor temperature is relatively low on average. In vernacular Chinese, the coldest period in winter is called the severe cold period. The rest of the time is finally called cold. However, due to the greenhouse effect, the current winter temperature changes are not very regular. The above can only be used as a reference. I hope it will help you!