The end of the summer season has been officially declared from an astronomical perspective. The term “dog days of summer” traces back to ancient civilizations, particularly ancient Greece and Egypt, referring to the brightest star in our system known as Sirius, also called the dog star. According to Orbax, a science communicator from the University of Guelph, this star was at its brightest from July 3 to Aug. 11 in southern Ontario, aligning 20 days before and after the rising and setting of Sirius alongside the sun.
In addition to its astronomical significance, the dog days of summer have been associated with the hottest days of the season, leading to various beliefs about the star and its impact on weather patterns. Ancient civilizations perceived Sirius as a consistent celestial body that rose and set at predictable times each year, akin to having an extra sun. As August progressed, vegetation wilted under the scorching heat, contributing to the belief that this period marked a challenging time due to the lack of modern conveniences like air conditioning.
As the summer season transitions, meteorologist Steven Flisfeder from Environment and Climate Change Canada notes that the dog days represent the peak of high temperatures before a gradual decline towards fall. The alignment of Sirius shining brightly in the sky often correlates with the hottest days occurring in late July and early August. Despite the approaching end of meteorological summer by the month’s close, warm temperatures may persist into early fall, with the potential for heat events extending into September.
While the dog days of summer signify a shift towards cooler weather, Flisfeder advises monitoring daily and weekly forecasts to stay prepared for any weather variations. The meteorological seasons, starting on the first day of their respective months for statistical convenience, help in anticipating changes and adapting to evolving climate conditions.