In Dean Burnett's article, Cruel Summer: how hot weather makes people angrier,  he looks at the psychology behind why people are more angry when it's hot. He says that one reason might be because when it's hot, higher temperatures increase heart rate, testosterone, and stimulate the sympathetic nervous system which is responsible for our fight-flight response. Another reason he suggests is due to discomfort. When people have no control over their discomfort this tends to make them angry, and usually they then displace this anger onto something else, like the person driving the car in front. It might also be due to something called cognitive neoassociation theory, which says that when people experience something negative, like being hot and uncomfortable, they tend to have a similar predisposition to anything they associate with it. So a person might also associate traffic jams, crowded beaches and shopping centres with being hot, and so have a similar negative feeling about them.  Dean also notes that there are 'numerous theories' which also handily creates room for me to look at this from a counselling perspective, using some of the principles of formative psychology developed by Stanley Keleman.