Boxing day night with the large garden lights on, it went from no snow to this in just over an hour.

That happened here as well and lasted for 6 days, my bottom pond froze completely but luckily the fishpond didn't, helped by the fat that we never turn the pump off...

I didnt turn the fountain pump off that floats with the lights! I'd gotten a new bigger bump and filter for christmas and was setting it all up to the waterfall when the snow came!!