The photo there is an excellent example of what a trainee pilot starting out might see on a first lesson. The dew-point aka wet-bulb temperature is a very important factor in aviation meteorology. It can determine icing conditions in IFR, and lack of engine performance even at sea level with naturally aspirated (NA) engines.
Especially important when you consider what may have been a dry runway and low humidity suddenly becomes a wet runway and high humidity.
Just imagine doing terrain avoidance somewhere like Indonesia. That is a major reason CFIT is so bad in such places. Hot, damp and relatively high elevation should ring alarm bells if you are flying with a NA engine. Maybe better to land the Cessna flaps 10, as if the flaps fuse blows at flaps 30 you most likely won’t have much climb performance.
Flaps 10 is ok to be stuck with as it isn’t too draggy.