Hot and humid weather sears the nation every July and August during the warmest time of the year, but why is this time of year called the “dog days” of summer?
The ancient Egyptians actually coined the phrase thousands of years ago, when they reigned in northeastern Africa for almost 30 centuries between 3100 and 332 B.C., according to History.com.
IT’S NOT THE HEAT, IT’S THE HUMIDITY: MOISTURE INCREASED HEAT RISK IN URBAN CLIMATES
The constellation Canis Major contains a star called Sirius – also known as the “Dog Star” – and it’s only visible in the Northern Hemisphere sky for 40 days each year between July 3 and Aug. 11, or the middle of summer.
It turns out that the ancient Egyptians thought unusually hot weather was directly related to the appearance of the Dog Star.
WHAT IS THE HEAT INDEX AND WHY IS IT IMPORTANT TO YOUR HEALTH?
Most people consider the entire month of August to be the dog days of summer since hot weather can be persistent through the month’s end, though by the technical ancient Egyptian interpretation, the dog days are actually over by mid-August.
HOW THE WEATHER YOU’RE ACCUSTOMED TO AFFECTS NATIONAL WEATHER SERVICE HEAT WARNINGS, ADVISORIES
We now know this isn’t true, but the ancient Egyptians believed the sun’s energy combined with the energy from Sirius and resulted in excessively hot temperatures.
The Dog Star is the brightest star in the sky (other than our own sun), though Sirius is 546,000 times farther from the Earth than the Sun, so the amount of radiation we receive from it has no effect on the planet’s temperatures.
HOW TO WATCH FOX WEATHER ON TV
This means the Dog Star actually has nothing to do with hot temperatures in July or August. It’s simply an ancient phrase from the Egyptians that has survived for thousands of years that’s used to describe uncomfortably hot weather.