Robert Wadlow (tallest man ever) died from an infection on his foot when he couldn’t feel a brace cutting into his skin.

Exactly. The summer solstice is in June, but typically July into August is the hottest part of the year.

With anything that’s warmed by a heat source, there is a “thermal lag time” where the temperature of what’s being warmed doesn’t start increasing right away. The bigger the system, the longer the lag time, and the earth is a pretty big system. Also, the energy provided by the sun generally is the same a week after the winter solstice as it is a week before, when the northern hemisphere is still cooling off on average. That’s why the coldest month tends to be January. When things start warming up in late February into March, the weather patterns tend to be windy and stormy as more energy is heating the northern hemisphere, causing evaporation from the oceans which runs into the cold air over the continents.