Sacred Haven of Debauchery

Actually, does it ever snow anywhere in Southeast Asia, and if so, when?

It definitely snows where there are mountains – Nepal, Japan... Maybe it snows somewhere further north, but not in the mountains. As for us, on the equator, it only snows in Snow City.

If you ask, the staff can even arrange a snowstorm. They have this huge vacuum cleaner that works in reverse, i.e., it blows out the snow that they load into it with a shovel from the nearest snowdrift. It creates a kind of mini-blizzard. Cheap and cheerful. However, I personally don't miss winter, so I went to see how they show winter to the locals once, and that's enough.
This is approximately how they show it.