It has frozen over
In the 1800’s, if the (lake?) froze over, the folks who could afford it took the time to head out on the ice. I can’t tell if they are depicted here as being very limber and acrobatic, or if a number of them are falling on their asses.
I read that this week in 1909, due a prolonged cold snap, Greenlake in Seattle was frozen, and folks were ice skating. This is unusual for our moderate climate in the Northwest.
Even if we have a good long cold spell, and the lakes and ponds freeze over solid, I am sure the government will warn us to stay off the ice. At least until they figure out a way to monetize it.