We've had a pretty cold winter for this part of the world. Nothing like what you are having in Ontario, though. But still cold enough that I wish I hadn't forgone a winter coat this year.
This is the first time I have ever seen snow in Zhengzhou stay on the ground for more than a week. The canals froze, but that happens at least once every winter. They stayed frozen for longer than usual, until the warm spell that started just before the weekend.
Last weekend, crossing the bridge on Nongyedong Lu just east of Zhongzhou Lu, I saw these.
Cracking and refreezing. The dendritic pattern usually indicates a diffusive process, but am not sure how that translates here.