How long are rivers typically frozen during Jilin winters?

In Jilin province, rivers are typically frozen for about five months during the winter. During this period, the ice on the Sungari River is often thick enough to support mule carts.1

It is important to note that this is a general characteristic of the region; local conditions can vary. For instance, the water flowing from the Fengman hydropower station on the Sungari River does not freeze in the winter, which allows for the formation of rime fog on nearby trees.2