Last time it got really hot, a couple of weeks ago, schools closed early, there was different uniform, all sorts of safety restrictions.
This time it's just 'get on with it'. I work with young children and we closed at midday last time... This time the kids are so hot and bothered in the afternoon. We have a couple of fans in a huge space which only work for one person if they're almost sitting on top of them, let alone a room of kids. It's too hot to go outside - no breeze.
So AIBU to expect some consistency? If it was unsafe before, it is unsafe now. It's already so hot today.