I have a tiny pond in my backyard. With temperatures dipping into the teens last night (and currently in the mid-20s!), the little guy froze completely solid.
A bit colder that we are used to here in Portland, the inside of the house was frigid too. When I woke up, my bedroom was around 42°! I know this because my alarm clock has a temperature gauge on it.
If I had leeeettle ice skates, I would go for a couple of spins around the rink. Watching over the pond is a moss-faced garden gnome that came with the house. The cement blocks in the pond are part of some sort of fountain - I think - which I will hopefully get working. In the spring. When it thaws. And it's not so cold.