Dog Days of Summer

What and when are the Dog Days of Summer?

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The phrase “Dog Days” conjures up the hottest, most sultry days of summer. What and when are the Dog Days of summer

The “Dog Days” are based in astronomy. The Old Farmer’s Almanac lists the traditional timing of the Dog Days: the 40 days beginning July 3 and ending August 11, coinciding with the heliacal (at sunrise) rising of the Dog Star, Sirius.

The rising of Sirius does not actually affect the weather (some of our hottest and most humid days occur after August 11), but for the ancient Egyptians, Sirius appeared just before the season of the Nile’s flooding, so they used the star as a “watchdog” for that event.

Since its rising also coincided with a time of extreme heat, the connection with hot, sultry weather was made for all time:

Dog Days bright and clear
indicate a happy year.
But when accompanied by rain,
for better times our hopes are vain
.

To check your summer temperatures, see our Weather Center.

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