Welcome to the “dog days” of summer, the time of year when heat and humidity force many of us indoors. As a Floridian, I think of this season as our winter. Some of us estivate in our air-conditioned homes and only come out to buy groceries or take the trash out. That is, unless we need to walk a dog.
Until recently I associated the phrase “dog days of summer” with the time of year when dogs pant more frequently and lie down more often. Dogs feel the heat just like their humans. But instead of sweating, our furry friends cool themselves by panting. When dogs inhale and exhale rapidly, the evaporation of water allows them to cool their body from the inside out. Dog owners know that they need to supply plenty of fresh water and shade to keep their pet from overheating.
Actually the phrase “dog days of summer” has nothing to do with the habits of dogs. According to the Old Farmer’s Almanac the “dog days” begin in the Northern Hemisphere on July 3, and last for forty days until August 11. (Unless you live in Florida, where the “dog days” seem to last until October.)
The phrase originated with the ancient Greeks, who discovered the rise of the Sirius star in the summer. The name Sirius stems from the Greek word “Seirious,” which means scorching or glowing. Sirius is part of the constellation Canis Majoris (the Greater Dog) and is the brightest star in the night sky. The Romans nicknamed Sirius the Dog Star, which led to referring to the hottest part of the summer as the “dog days”. The phrase stuck.
The ancient Greeks and Romans thought Sirius emitted heat and contributed to the rise in temperature during the summer. The Egyptians correlated the flooding of the Nile River with the “dog days.” Sirius became a “watchdog” for this weather event. No matter how you look at it, summer ushered in a time of extreme weather conditions. The Romans saw the rise of Sirius as a bad omen, responsible for drought, disease, discomfort, and insanity. They even went so far as to sacrifice dogs in hope of appeasing the Dog Star. Excuse my pun, but might that be a hot dog?
The ancients didn’t understand that the “dog days” are caused by earth’s orbit around the Sun. Remember our general science class where we learned that the northern hemisphere receives the most direct angle of sunlight in the summer? Soon after the June twentieth summer solstice, the North Pole is at its maximum tilt toward the Sun which makes our days longer and hotter. Sirius is hotter than the Sun, but it does not affect our weather because it’s further away—8.6 light years from Earth.
Whew! I feel better knowing this uncomfortable season was not named after man’s best friend. Aren’t you thankful we live in the year 2025? During our “dog days” we can run to the comfort of air-conditioning and take Fido with us.
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