This is what I think of when it's above 20ºc:
That is all I have the energy for today.
I am supposed to get on with the next unit of my proofreading course this evening. I will do that, as long as it's not still scorching hot. My brain is sweating.
Incidentally, in my car is said that it's 27ºc, which is considerably more than 20ºc, so I'm not being soooooo totally pathetic.