Benbah: yeah, I do wonder how we would go here in Australia! Our deserts have something going for them beside high UV: however hot the days are, and they can be hotter than you'd believe, at night the deserts freeze. Thoroughly. In summer it gets down to just a few degrees Centigrade, some nights. In winter, however, it can get well below zero C. I've worked in the Tanami desert, and also out by Mintabie and Copper Hills, about this time of year (July is the middle of winter here), and woken in the morning to find all the water containers not in vehicles frozen solid. You need a very well-lined swag! Then of course three hours after dawn it's hot again, though nowhere near as hot as in summer.
We do get snow, mostly in the eastern and southeastern mountains and Tasmania. Not a lot compared to Scandinavia, but a good Snowy Mountains storm can still ruin your whole lifetime. Where I live now, in the colder part of the Barossa, it snows some winters, usually not much or for very long. The little town where I lived in the Snowies used to be snowed in for a few weeks most winters. I think they get less these years, was just reading a news report about how we're having the worst ski season ever, despite the first snowfall being very early this year. Climate disruption, huh!
I'd be curious to see how Taipan venom affected trolls, if at all. Or Sydney Funnelweb venom. A lot would depend on whether marsupials count as 'mammals' for the purposes of the Rash. If yes, we're doomed!