Blue Monday is called “Blue Monday” because it mixes the old idea of “blue” meaning sadness with a modern marketing label for the “most depressing day of the year.”

What Blue Monday Means

  • The phrase today usually refers to a specific Monday in January, often the third Monday, promoted as “the most depressing day of the year.”
  • It links common winter lows: dark, cold weather, post-holiday comedown, debts after Christmas, and fading motivation on New Year’s resolutions.

Who Invented It (Modern Version)

  • In 2005, UK psychologist Cliff Arnall created a “formula” for a travel company called Sky Travel to identify the saddest day in January.
  • This formula included factors like weather, debt, salary, time since Christmas, low motivation, and feeling the need to “take action,” but scientists and mental health experts widely view it as pseudoscience and marketing, not real psychology.

Why The Word “Blue”?

  • In English, “blue” has long been linked with feeling low or sad (“having the blues”).
  • As far back as the 1830s, “Blue Monday” described workers’ hangovers and low mood after heavy weekend drinking, and later it was also used for the tough, chore-filled wash day at home, so the term already carried a gloomy tone.

Is Blue Monday Actually Real?

  • Researchers and mental health organizations say there is no solid evidence that one specific Monday in January is truly the “most depressing day of the year.”
  • Many mental health charities now use the day as a hook to talk about real ongoing issues like depression and seasonal affective disorder, and to encourage people to seek support all year round, not just on one date.

Quick Scoop: Why It’s Called Blue Monday

  • The name combines:
    1. “Blue” = sad mood in long-standing English usage.
2. “Monday” = traditionally a tough, low-energy day after the weekend.

3. A 2000s travel-marketing campaign claiming to have “calculated” the most depressing day of the year, which stuck in media and pop culture even though the science behind it is very weak.

So the label sounds scientific, but it is mostly a catchy marketing idea built on older associations between the color blue, Mondays, and feeling down.