Very frosty! Have seen my telescope like that a few times in the Scottish Highlands where -10C wasn't all that uncommon. It's tricky when what is normally dew on the eye lens (Scottish air is almost always humid, or from your breath), then freezes, making observing very tricky! You effectively get rime ice over your gear and it can cut the observing short. The sparkly frost and snow is always nice though.
The best observing conditions I've ever seen were at -25C also in the Highlands. Only lasted a little over half an hour outside before getting inside to the warm fire, but did see the Horsehead Nebula (8" scope, UHC filter) in that time. If Aussie conditions can beat that without the frost, I'll definitely look forward to it!
Orion still looks strange as a summer constellation
