It's hot out. That's to be expected. It's summer across the country, including here in central Illinois. Folks often call these the "dog days." While it's commonly thought that the phrase came into being to describe days so hot that even dogs couldn't bring themselves to stir, its roots are actually more astronomical.
To the ancient Greeks, the hottest days of the summer were marked by the appearance in the heavens of Sirius, the Dog Star. When it appeared before the sun's rising, it meant the arrival of the hottest season and raised fears of fevers and catastrophe.