The other thing is that people use the classic chart trick of not starting the Y axis from zero Kelvin (the only scientific scale). If you do that you see that even including all these stations the trend is imperceptible.
On that scale, the difference between normal human body temperature and dangerous hyperthermia is just about imperceptible too. Even the difference between summer and winter is pretty small. Dunno why we bother with heating and air conditioning and having two sets of clothing.
