I would be worried that pipes would freeze, etc.
—I guess if you live in a bitter cold area already, you may not worry, but houses and infrastructure are built with the local weather in mind.
I live in central Illinois and it gets pretty cold here in the winter, humid and hot in the summer. I'm prepared for both.
These people in the U.K. that expect the government to warn them when it's going to be extra cold, where it's normally cold anyway, depend on nanny government to tell them when to change baby's nappies.