In which month does Songhua River freeze?

Songhua River generally begins to freeze in the middle and late period of 1 1. Located in the south of Heilongjiang Province, China, it belongs to the continental monsoon climate of cold temperate zone. During this period, the weather was cold and dry, which led to the gradual freezing of water on the river surface and the formation of thick ice layers. The freezing period lasted until May of the following year and began to thaw.