Ahh it's a bit different if all your buildings were never made with such temperatures in mind. Not to mention if you've never seen such temperatures in your usual day to day.
We get around -2c to 40c+ where I live depending on the season, summer here floors people from colder climates.
Okay but if you went out in -10(14f) in a shirt you would probably freeze and sometimes i see people here out in -20(-4f) without a coat so it depends on where you live. In hungary(where im from) 28(82f) is extremely lucky in summer but instead we get 40(104f) which isnt my favourite weather.