The combination of heat waves and fragile power grids (e.g., Texas' ERCOT) seems to make it inevitable that a heat-induced large-scale power outage will produce a mass causality event.
Crazy to think of it that hot.
I experienced both temps in Calgary—it's notoriously volatile because of the Chinook winds (https://en.wikipedia.org/wiki/Chinook_wind) that come down from the Rockies.
Middle of summer could see a swing from -15°C to +15°C inside of hours. Calgary would frequently be -30 to -40 in the winter and easily a dry heat of +30 in the summers, but usually not for extended periods because the winds would inevitably change.
It's just that nearly everyone on HN is from the coastal plain(s) of North America or Europe so this isn't something people think about unless they need to make a "it gets cold in the desert at night" quip for easy points.