I was surprised by how continental (yes, queue the etymology jokes) Antarctica is, but I guess it makes sense. It doesn't get hot, but the kind of cold it gets makes 18 degrees look like 48. It's just on a totally different temperature scale.
It’s just a country that contains both Alaska and Death Valley. I kind of wish the globe had been evenly divided, so we could see what regions actually have the highest variability. The way it currently is, all the big countries with mixed climates have the highest swings, which provides no real information.
The real Wakanda. They don't need such silly things as infrastructure, because indoor spaces are unnecessary when you've never even heard of weather.
(Breaking the jerk, it's been doing very well over the past couple decades but it's still a typical African country, albeit with surprisingly low temperature variability)